Fuminori Tanihara, Maki Hirata and Takeshige Otoi : GEEP Method: An Optimized Electroporation-Mediated Gene Editing Approach for Establishment of Knockout Pig Lines., Methods Mol Biol., 2023.
(要約)
Pigs are excellent large animal models owing to their several physiological and anatomical similarities to humans. Somatic cell nuclear transfer using gene-modified cells is the mainstream approach for generating genetically modified pigs. Recent advances in improving gene editors such as the CRISPR/Cas9 system have enabled direct gene modification in zygotes/embryos. Here, we describe the gene editing by electroporation of Cas9 protein (GEEP) method, an optimized electroporation-mediated method for the introduction of CRISPR/Cas9 into porcine zygotes/embryos. The simplicity and micromanipulation-free procedures are the major advantages of this method.
Koki Takebayashi, Manita Wittayarat, Maki Hirata, Qingyi Lin, Zhao Namula, Nanaka Torigoe, Bin Liu, Megumi Nagahara, Aya Nakai, Takeshige Otoi and Fuminori Tanihara : Optimization of embryonic stage for aggregation to generate chimeric pigs using gene-edited blastomeres., In Vitro Cellular & Developmental Biology. Animal, 2024.
Qingyi Lin, Koki Takebayashi, Nanaka Torigoe, Bin Liu, Zhao Namula, Maki Hirata, Fuminori Tanihara, Megumi Nagahara and Takeshige Otoi : Genome editing of porcine zygotes via lipofection of two guide RNAs using a CRISPR/Cas9 system., The Journal of Reproduction and Development, 2024.
(要約)
CRISPR/Cas9-based multiplex genome editing via electroporation is relatively efficient; however, lipofection is versatile because of its ease of use and low cost. Here, we aimed to determine the efficiency of lipofection in CRISPR/Cas9-based multiplex genome editing using growth hormone receptor (GHR) and glycoprotein alpha-galactosyltransferase 1 (GGTA1)-targeting guide RNAs (gRNAs) in pig zygotes. Zona pellucida-free zygotes were collected 10 h after in vitro fertilization and incubated with Cas9, gRNAs, and Lipofectamine 2000 (LP2000) for 5 h. In Experiment 1, we evaluated the mutation efficiency of gRNAs targeting either GHR or GGTA1 in zygotes transfected using LP2000 and cultured in 4-well plates. In Experiment 2, we examined the effects of the culture method on the development, mutation rate, and mutation efficiency of zygotes with simultaneouslydouble-edited GHR and GGTA1, cultured using 4-well (group culture) and 25-well plates (individual culture). In Experiment 3, we assessed the effect of additional GHR-targeted lipofection before and after simultaneous double gRNA-targeted lipofection on the mutation efficiency of edited embryos cultured in 25-well plates. No significant differences in mutation rates were observed between the zygotes edited with either gRNA. Moreover, the formation rate of blastocysts derived from GHR and GGTA1 double-edited zygotes was significantly increased in the 25-well plate culture compared to that in the 4-well plate culture. However, mutations were only observed in GGTA1 when zygotes were transfected with both gRNAs, irrespective of the culture method used. GHR mutations were detected only in blastocysts derived from zygotes subjected to GHR-targeted lipofection before simultaneous double gRNA-targeted lipofection. Overall, our results suggest that additional lipofection before simultaneous double gRNA-targeted lipofection induces additional mutations in the zygotes.
Megumi Nagahara, Zhao Namula, Qingyi Lin, Koki Takebayashi, Nanaka Torigoe, Bin Liu, Fuminori Tanihara, Takeshige Otoi and Maki Hirata : Effects of ergothioneine supplementation on meiotic competence and porcine oocyte development., Veterinary World, Vol.17, No.8, 1748-1752, 2024.
(要約)
Supplementing with EGT during IVM leads to better oocyte maturation, quality, and embryonic development due to decreased DNA fragmentation. The present study failed to elucidate the mechanism of DNA fragmentation reduction by EGT. More research needs to be conducted to explore the antioxidant mechanism of EGT.
Bin Liu, Manita Wittayarat, Koki Takebayashi, Qingyi Lin, Nanaka Torigoe, Zhao Namula, Maki Hirata, Megumi Nagahara, Fuminori Tanihara and Takeshige Otoi : Effects of centrifugation treatment before electroporation on gene editing in pig embryos., In Vitro Cellular & Developmental Biology. Animal, 2024.
(要約)
Genetic mosaicism, characterized by multiple genotypes within an individual, is considered an obstacle to CRISPR/Cas9 genome editing in animal models. Despite the various strategies for minimizing mosaic mutations, no definitive methods exist to eliminate them. This study aimed to enhance gene editing efficiency in porcine zygotes using CRISPR/Cas9, which targets specific genes through centrifugation and zona pellucida removal before electroporation. Centrifugation at 2000 × g did not adversely affect blastocyst formation rates in zygotes electroporated with gRNA targeting the GGTA1 gene; instead, it led to increased total and monoallelic mutation rates compared with control zygotes without centrifugation. However, the groups had no significant differences in biallelic mutation rates. In zygotes electroporated with gRNA targeting the CMAH gene, centrifugation treatments exceeding 1000 × g significantly increased both biallelic mutation rates and mutation efficiency. The combination of centrifugation and zona pellucida removal did not have a detrimental effect on blastocyst formation rates. It led to a higher rate of double biallelic mutations in embryos targeting both GGTA1 and CMAH compared to embryos without centrifugation treatment. In summary, our results demonstrate that pre-electroporation treatments, including centrifugation and zona pellucida removal, positively influenced the reduction of mosaic mutations, with the effectiveness of centrifugation depending on the specific gRNA used.
Qingyi Lin, Koki Takebayashi, Nanaka Torigoe, Bin Liu, Zhao Namula, Maki Hirata, Megumi Nagahara, Fuminori Tanihara and Takeshige Otoi : Evaluation of culture methods and chemical reagent combinations on CRISPR/Cas9 gene editing systems by lipofection in pig zygotes., In Vitro Cellular & Developmental Biology. Animal, 2024.
(要約)
The delivery of CRISPR/Cas ribonucleoprotein (RNP) complexes is gaining attention owing to its high cleavage efficiency and reduced off-target effects. Although RNPs can be delivered into porcine zygotes via electroporation with relatively high efficiency, lipofection-mediated transfection appears to be versatile because of its ease of use, low cost, and adaptation to high-throughput systems. However, this system requires improvements in terms of embryo development and mutation rates. Therefore, this study elucidated the effects of culture methods and reagent combinations on the CRISPR/Cas9 gene editing systems by using three lipofection reagents: Lipofectamine™ CRISPRMAX™ Cas9 Transfection Reagent (CM), Lipofectamine™ 2000 Transfection Reagent (LP), and jetCRISPR™ RNP Transfection Reagent (Jet). Porcine zona pellucida-free zygotes were incubated for 5 h with Cas9, a guide RNA targeting CD163, and the above lipofection reagents. When examining the effect of culture methods using 4-well (multiple embryo culture) and 25-well plates (single embryo culture) on the efficiency of CM-mediated zygote transfection, the culture of embryos in 25-well plates significantly increased the blastocyst formation rate; however, there was no difference in mutation rates between the 4-well and 25-well plates. When assessing the effects of individual or combined reagents on the efficiency of zygote transfection, the mutation rate was significantly lower for individual LP compared to individual CM- and Jet-mediated transfections. Moreover, combinations of lipofection transfection reagents did not significantly increase the mutation rate or mutation efficiency.
Thanh-Van Nguyen, Kim Lanh Thi Do, Qingyi Lin, Megumi Nagahara, Zhao Namula, Manita Wittayarat, Maki Hirata, Takeshige Otoi and Fuminori Tanihara : Programmed cell death-1-modified pig developed using electroporation-mediated gene editing for in vitro fertilized zygotes., In Vitro Cellular & Developmental Biology. Animal, 2024.
(要約)
Programmed cell death-1 (PD-1) is an immunoinhibitory receptor required to suppress inappropriate immune responses such as autoimmunity. Immune checkpoint antibodies that augment the PD-1 pathway lead to immune-related adverse events (irAEs), organ non-specific side effects due to autoimmune activation in humans. In this study, we generated a PD-1 mutant pig using electroporation-mediated introduction of the CRISPR/Cas9 system into porcine zygotes to evaluate the PD-1 gene deficiency phenotype. We optimized the efficient guide RNAs (gRNAs) targeting PD-1 in zygotes and transferred electroporated embryos with the optimized gRNAs and Cas9 into recipient gilts. One recipient gilt became pregnant and gave birth to two piglets. Sequencing analysis revealed that both piglets were biallelic mutants. At 18 mo of age, one pig showed non-purulent arthritis of the left elbow/knee joint and oligozoospermia, presumably related to PD-1 modification. Although this study has a limitation because of the small number of cases, our phenotypic analysis of PD-1 modification in pigs will provide significant insight into human medicine and PD-1-deficient pigs can be beneficial models for studying human irAEs.
Thanh-Van Nguyen, Koki Takebayashi, Kim Lanh Thi Do, Zhao Namula, Manita Wittayarat, Megumi Nagahara, Maki Hirata, Takeshige Otoi and Fuminori Tanihara : Generation of allogenic chimera carrying mutations in PDX1 and TP53 genes via phytohemagglutinin-mediated blastomere aggregation in pigs., In Vitro Cellular & Developmental Biology. Animal, 2024.
(要約)
The generation of genetically engineered pig models that develop pancreas-specific tumors has the potential to advance studies and our understanding of pancreatic cancer in humans. TP53 mutation causes organ-nonspecific cancers, and PDX1-knockout results in the loss of pancreas development. The aim of the present study was to generate a PDX1-knockout pig chimera carrying pancreas complemented by TP53 mutant cells via phytohemagglutinin (PHA)-mediated blastomere aggregation using PDX1 and TP53 mutant blastomeres, as a pig model for developing tumors in the pancreas with high frequency. First, the concentration and exposure time to PHA to achieve efficient blastomere aggregation were optimized. The results showed that using 300 µg/mL PHA for 10 min yielded the highest rates of chimeric blastocyst formation. Genotyping analysis of chimeric blastocysts derived from aggregated embryos using PDX1- and TP53-edited blastomere indicated that approximately 28.6% carried mutations in both target regions, while 14.3-21.4% carried mutations in one target. After the transfer of the chimeric blastocysts into one recipient, the recipient became pregnant with three fetuses. Deep sequencing analysis of the PDX1 and TP53 regions using ear and pancreas samples showed that one fetus carried mutations in both target genes, suggesting that the fetus was a chimera derived from embryo-aggregated PDX1 and TP53 mutant blastomeres. Two out of three fetuses carried only the PDX1 mutation, indicating that the fetuses developed from embryos not carrying TP53-edited blastomeres. The results of the present study could facilitate the further improvement and design of high-frequency developing pancreatic tumor models in pigs.
Qingyi Lin, Koki Takebayashi, Nanaka Torigoe, Bin Liu, Zhao Namula, Maki Hirata, Fuminori Tanihara, Megumi Nagahara and Takeshige Otoi : Comparison of chemically mediated CRISPR/Cas9 gene editing systems using different nonviral vectors in porcine embryos., Animal Science Journal, Vol.94, No.1, e13878, 2023.
(要約)
The transfection efficiency of clustered regularly interspaced short palindromic repeats (CRISPR)/Cas ribonucleoprotein complexes was compared using three nonviral vector transfection reagents: nonliposomal polymeric (TransIT-X2), lipid nanoparticle delivery (CRISPRMAX), and peptide (ProteoCarry) systems. Porcine zona pellucida-free zygotes and embryos were incubated for 5 h with CRISPR-associated protein 9 (Cas9), guide RNA (gRNA) targeting GGTA1, and one of the reagents. In Experiment 1, optimization of Cas9 protein to gRNA molar ratios of 1:2, 2:2, and 4:2, along with single or double doses of reagents, was performed on zygotes at 10 h post-in vitro fertilization. In Experiment 2, optimization of timing was performed at 10 or 29 h post-in vitro fertilization, using optimal molar ratios and reagent doses. Blastocyst formation, mutation rates, and mutation efficiency were measured in each experiment. For each reagent, a 4:2 Cas9:gRNA molar ratio and addition of a double reagent dose exhibited a higher mutation rate; however, blastocyst rate tended to decrease compared with that of control. Moreover, the optimal transfection time varied depending on the reagent, and the proportions of blastocysts carrying mutations were <34%. In conclusion, the above three transfectants allowed gene editing of porcine zygotes and embryos; however, this newly established chemistry-based technology needs further improvement, especially regarding editing efficiency and embryo development.
Hisayoshi Omori, Junko Chikamoto, Megumi Nagahara, Maki Hirata and Takeshige Otoi : Evaluating variations in bilirubin glucuronidation activity by protease inhibitors in canine and human primary hepatocytes cultured in a 3D culture system., Toxicology In Vitro, Vol.93, 2023.
(要約)
Bilirubin is excreted into the bile from hepatocytes, mainly as monoglucuronosyl and bisglucuronosyl conjugates, reflecting bilirubin glucuronidation activity. However, there is limited information on the in vitro evaluation of liver cell lines or primary hepatocytes. This study aimed to investigate variations in the bilirubin metabolic function of canine and human hepatocyte spheroids formed in a three-dimensional (3D) culture system indicated by the formation of bilirubin glucuronides when protease inhibitors such as atazanavir, indinavir, ritonavir, and nelfinavir were treated with bilirubin. The culture supernatant was collected for bilirubin glucuronidation assessment and the cells were used to evaluate viability. On day 8 of culture, both canine and human hepatocyte spheroids showed high albumin secretion and distinct spheroid formation, and their bilirubin glucuronidation activities were evaluated considering cell viability. Treatment with atazanavir and ritonavir remarkably inhibited bilirubin glucuronide formation, wherein atazanavir showed the highest inhibition, particularly in human hepatocyte spheroids. These results may reflect the effects on cellular uptake of bilirubin and its intracellular metabolic function. Thus, primary hepatocytes cultured in a 3D culture system may be a useful in vitro system for the comprehensive evaluation of bilirubin metabolic function and risk assessment in bilirubin metabolic disorders for drug development.
Chommanart Thongkittidilok, Maki Hirata, Qingyi Lin, Nanaka Torigoe, Bin Liu, Yoko Sato, Megumi Nagahara, Fuminori Tanihara and Takeshige Otoi : Mosaic TP53 Mutation on Tumour Development in Pigs: A Case Study., Veterinary Medicine International, Vol.2023, 7000858, 2023.
(要約)
mutations with truncated amino acids may be related to tumour formation.
Fuminori Tanihara, Maki Hirata, Zhao Namula, Manita Wittayarat, Lanh Thi Kim Do, Qingyi Lin, Koki Takebayashi, Hiromasa Hara, Megumi Nagahara and Takeshige Otoi : GHR-mutant pig derived from domestic pig and microminipig hybrid zygotes using CRISPR/Cas9 system., Molecular Biology Reports, Vol.50, No.6, 5049-5057, 2023.
(要約)
Pigs are excellent large animal models with several similarities to humans. They provide valuable insights into biomedical research that are otherwise difficult to obtain from rodent models. However, even if miniature pig strains are used, their large stature compared with other experimental animals requires a specific maintenance facility which greatly limits their usage as animal models. Deficiency of growth hormone receptor (GHR) function causes small stature phenotypes. The establishment of miniature pig strains via GHR modification will enhance their usage as animal models. Microminipig is an incredibly small miniature pig strain developed in Japan. In this study, we generated a GHR mutant pig using electroporation-mediated introduction of the CRISPR/Cas9 system into porcine zygotes derived from domestic porcine oocytes and microminipig spermatozoa. First, we optimized the efficiency of five guide RNAs (gRNAs) designed to target GHR in zygotes. Embryos that had been electroporated with the optimized gRNAs and Cas9 were then transferred into recipient gilts. After embryo transfer, 10 piglets were delivered, and one carried a biallelic mutation in the GHR target region. The GHR biallelic mutant showed a remarkable growth-retardation phenotype. Furthermore, we obtained F1 pigs derived from the mating of GHR biallelic mutant with wild-type microminipig, and GHR biallelic mutant F2 pigs through sib-mating of F1 pigs. We have successfully demonstrated the generation of biallelic GHR-mutant small-stature pigs. Backcrossing of GHR-deficient pig with microminipig will establish the smallest pig strain which can contribute significantly to the field of biomedical research.
Thanh-Van Nguyen, Kim Lanh Thi Do, Zhao Namula, Qingyi Lin, Nanaka Torigoe, Megumi Nagahara, Maki Hirata, Fuminori Tanihara and Takeshige Otoi : Development and Genome Mutation of Bovine Zygotes Vitrified Before and After Genome Editing via Electroporation, Cryo Letters, Vol.44, No.2, 118-122, 2023.
Fuminori Tanihara, Maki Hirata, Zhao Namula, Kim Lanh Thi Do, Naoaki Yoshimura, Qingyi Lin, Koki Takebayashi, Tetsushi Sakuma, Takashi Yamamoto and Takeshige Otoi : Pigs with an INS point mutation derived from zygotes electroporated with CRISPR/Cas9 and ssODN, Frontiers in Cell and Developmental Biology, Vol.11, 2023.
(要約)
electroporation-mediated introduction of the CRISPR/Cas9 system into zygotes, thereby avoiding the time-consuming and complicated micromanipulation method.
Koki Takebayashi, Manita Wittayarat, Qingyi Lin, Nanaka Torigoe, Bin Liu, Maki Hirata, Megumi Nagahara, Fuminori Tanihara and Takeshige Otoi : Efficiency of genetic modification in gene-knockout sperm-derived zygotes followed by electroporation of guide RNA targeting the same gene., Animal Science Journal, Vol.94, No.1, e13842, 2023.
(要約)
Genetic mosaicism is considered one of the main limitations of the electroporation method used to transfer CRISPR-Cas9/guide RNA (gRNA) into porcine zygotes. We hypothesized that fertilization of oocytes with sperm from gene-deficient boars, in combination with electroporation (EP) to target the same region of the gene in subsequent zygotes, would increase the gene modification efficiency. As myostatin (MSTN) and α1,3-galactosyltransferase (GGTA1) have beneficial effects on agricultural production and xenotransplantation, respectively, we used these two genes to test our hypothesis. Spermatozoa from gene-knockout boars were used for oocyte fertilization in combination with EP to transfer gRNAs targeting the same gene region to zygotes. No significant differences in the rates of cleavage and blastocyst formation as well as in the mutation rates of blastocysts were observed between the wild-type and gene-deficient spermatozoa groups, irrespective of the targeted gene. In conclusion, the combination of fertilization with gene-deficient spermatozoa and gene editing of the same targeted gene region using EP had no beneficial effects on embryo genetic modification, indicating that EP alone is a sufficient tool for genome modification.
(キーワード)
Male / Animals / Swine / Gene Editing / Zygote / CRISPR-Cas Systems / Semen / Electroporation / RNA, Guide, CRISPR-Cas Systems
Anh Quynh Le, Manita Wittayarat, Zhao Namula, Qingyi Lin, Koki Takebayashi, Maki Hirata, Fuminori Tanihara, Kim Lanh Thi Do and Takeshige Otoi : Multiple gene editing in porcine embryos using a combination of microinjection, electroporation, and transfection methods., Veterinary World, Vol.15, No.9, 2210-2216, 2022.
(要約)
The combination of CRISPR/Cas9 delivery methods may improve the mutation efficiency of triple-gene edited porcine blastocysts.
Animal gastrointestinal tracts are populated by highly diverse and complex microbiotas. The gut microbiota influences the bioavailability of dietary components and is closely associated with physiological processes in the host. Clostridium butyricum reportedly improves growth performance and affects the gut microbiota and immune functions in post-weaning piglets. However, the effects of C. butyricum on finishing pigs remain unclear. Therefore, we herein investigated the effects of C. butyricum MIYAIRI 588 (CBM588) on the gut microbiota of finishing pigs. 16S rRNA gene sequencing was performed using fecal samples and ileal, cecal, and colonic contents collected after slaughtering. The α-diversity of the small intestinal microbiota was lower than that of the large intestinal microbiota, whereas β-diversity showed different patterns depending on sample collection sites. The administration of CBM588 did not significantly affect the α- or β-diversity of the microbiotas of fecal and intestinal content samples regardless of the collection site. However, a linear discriminant ana-lysis Effect Size revealed that the relative abundance of Lactobacillaceae at the family level, Bifidobacterium at the order level, and Lactobacillus ruminis and Bifidobacterium pseudolongum at the species level were higher in the fecal samples and cecal and colonic contents of the treatment group than in those of the control group. Therefore, the administration of CBM588 to finishing pigs affected the composition of the gut microbiota and increased the abundance of bacteria that are beneficial to the host. These results provide important insights into the effects of probiotic administration on relatively stable gut microbial ecosystems.
Hisayoshi Omori, Junko Chikamoto, Takayuki Hirano, Kazuhiko Besshi, Naoaki Yoshimura, Maki Hirata and Takeshige Otoi : Comparative analysis of bilirubin glucuronidation activity in canine and human primary hepatocytes using a 3D culture system., In Vitro Cellular & Developmental Biology. Animal, Vol.58, No.8, 712-718, 2022.
(要約)
Species differences in bilirubin glucuronidation activity are observed between humans and dogs through liver microsomes and recombinant UDP-glucuronosyltransferase 1A1. Humans exhibit higher activity than that of dogs. In this study, bilirubin glucuronidation activity was examined in canine and human primary hepatocyte spheroids formed using a 3D culture system. When spheroid development in canine and human primary hepatocytes was evaluated on days 7 and 14 after the start of culture, canine primary hepatocyte spheroids had a more distinct spherical shape than human hepatocyte spheroids, irrespective of the culture period. Furthermore, mono- and di-glucuronide generation detected in spheroids were significantly higher (P < 0.05) in human primary hepatocytes than in canine primary hepatocytes after 24 h of incubation with bilirubin for each culture period. These results suggest that there are species differences in the bilirubin glucuronidation activity of primary hepatocytes with spheroid formation between humans and dogs, with the activity being higher in humans than in dogs.
Koki Takebayashi, Manita Wittayarat, Qingyi Lin, Maki Hirata, Naoaki Yoshimura, Nanaka Torigoe, Megumi Nagahara, Kim Lanh Thi Do, Fuminori Tanihara and Takeshige Otoi : Gene editing in porcine embryos using a combination of electroporation and transfection methods., Reproduction in Domestic Animals = Zuchthygiene, Vol.57, No.10, 1136-1142, 2022.
(要約)
CRISPR/Cas9 (clustered regularly interspaced short palindromic repeats-CRISPR-associated protein 9) technology is growing rapidly and has been greatly influencing the efficiency and effectiveness of genetic modifications in different applications. One aspect of research gaining importance in the development of the CRISPR/Cas9 system is the introduction of CRISPR materials into target organisms. Although we previously demonstrated the efficacy of electroporation- and lipofection-mediated CRISPR/Cas9 gene disruption in porcine zygotes, we still believe that the efficiency of this system could be improved by combining these two methods. The present study was thus conducted to clarify the effects of a combination of electroporation and lipofection for delivering CRISPR/Cas9 components into zona pellucida (ZP)-intact and -free zygotes. The results revealed that electroporation alone significantly increased the biallelic mutation rates in the resulting blastocysts compared to lipofection alone, irrespective of the presence of ZP. None of ZP-intact zygotes treated by lipofectamine alone had any mutations, suggesting that removal of the ZP is necessary for enabling CRISPR/Cas9-based genome editing via lipofection treatment in the zygotes. Additional lipofectamine treatment after electroporation did not improve the rates of total and biallelic mutations in the resulting blastocysts derived from either ZP-intact or -free zygotes.
(キーワード)
Animals / CRISPR-Associated Protein 9 / CRISPR-Cas Systems / Electroporation / Gene Editing / Swine / Transfection / Zygote
Megumi Shimazaki, Manita Wittayarat, Rentsenkhand Sambuu, Asami Sugita, Masaki Kawaguchi, Maki Hirata, Fuminori Tanihara, Mitsuhiro Takagi, Masayasu Taniguchi, Takeshige Otoi and Yoko Sato : Disruption of cell proliferation and apoptosis balance in the testes of crossbred cattle-yaks affects spermatogenic cell fate and sterility., Reproduction in Domestic Animals = Zuchthygiene, Vol.57, No.9, 999-1006, 2022.
(要約)
The balance between proliferation, differentiation and apoptosis is well-coordinated in spermatogenesis for the timely production of appropriate numbers of sperm in animals. Disruption or decrease in sperm production is due to many conditions, including changes in testicular cell fate balance. Interspecies hybridization of domestic yaks and cattle results in sterility in males because of spermatogenic arrest; however, the underlying mechanisms involved in sterility are still unclear. In the present study, we investigated the proliferation and apoptosis status during the development of yaks and crossbred cattle-yaks using immunohistochemistry of proliferating cell nuclear antigen and terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling assays. Testicular tissues from yaks (immature: 1 year old, mature: 2-3 years old) and backcrossed hybrids (2 year old) were collected and used to investigate the expression of each parameter in testicular cells. During the maturation of yak testes, proliferation and apoptosis became active only in spermatogenic cells, and not in other somatic cells, such as Sertoli cells, myoid cells and Leydig cells. Furthermore, hybrid cattle-yak testes maintained proliferation ability but less apoptotic ability in spermatogenic cells when compared to yaks of the same age, suggesting that normal spermatogenic cell fate control is disrupted by changes in the balance between proliferation and apoptosis. In addition, Leydig cell proliferation rate was higher than apoptosis rate in the cattle-yak testes, indicating an increased number of Leydig cells, which may affect spermatogenesis through changes in steroidogenesis. Although epigenetic changes may be involved in cattle-yak testes, further studies are needed to clarify the modulation of proliferation and apoptosis to elucidate the mechanisms of infertility in hybrid cattle-yak males.
Zhao Namula, Manita Wittayarat, Kim Lanh Thi Do, Thanh Nguyen Van, Qingyi Lin, Koki Takebayashi, Maki Hirata, Fuminori Tanihara and Takeshige Otoi : Effects of the timing of electroporation during in vitro maturation on triple gene editing in porcine embryos using CRISPR/Cas9 system, Veterinary and Animal Science, Vol.16, 2022.
(要約)
were simultaneously introduced into the oocytes that had been incubated for 40, 42, and 44 h from the start of the IVM culture. Electroporation with three gRNAs at 40 h and 42 h during IVM culture decreased the blastocyst formation rates and did not improve the mutation rates and target number of biallelic mutations in the resulting blastocysts. The blastocyst formation rate, mutation rates, and target numbers in the resulting blastocysts from oocytes treated by electroporation at 44 h of IVM culture were similar to those of control zygotes electroporated at 13 h after the initiation of IVF. In conclusion, multiple gene editing efficiency in the resulting blastocysts was comparable between oocytes electroporated before and after the fertilization, indicating that oocytes with completed maturation time may allow better functioning of materials accepting gene editing application.
Zhao Namula, Anh Quynh Le, Manita Wittayarat, Qingyi Lin, Koki Takebayashi, Maki Hirata, Kim Lanh Thi Do, Fuminori Tanihara and Takeshige Otoi : Triple gene editing in porcine embryos using electroporation alone or in combination with microinjection., Veterinary World, Vol.15, No.2, 496-501, 2022.
(要約)
These results indicate that although a combination of MI and EP does not improve the mutation efficiency or biallelic mutation for triple-gene knockout, MI treatment before EP is better to reduce mortality in porcine zygotic gene editing through a combination of MI and EP.
Qingyi Lin, Anh Quynh Le, Koki Takebayashi, Maki Hirata, Fuminori Tanihara, Chommanart Thongkittidilok, Osamu Sawamoto, Takeshi Kikuchi and Takeshige Otoi : Viability and developmental potential of porcine blastocysts preserved for short term in a chemically defined medium at ambient temperature., Reproduction in Domestic Animals = Zuchthygiene, Vol.57, No.5, 556-563, 2022.
(要約)
-S [Cell-S]) for short-term storage. In the first experiment, in vitro-derived blastocyst were stored at 25ºC for 24 hr in Cell-W solution, Cell-S solution and pig embryo culture (PBM) medium. There were no differences in the rates of survival and development of stored blastocysts between the Cell-S and Cell-W solutions, but the total cell number of embryos that survived after storage in Cell-S solution was significantly higher (p < .05) than that in the Cell-W solution. In the second experiment, Cell-S solution was used to store the in vitro-derived blastocysts at 20°C, 25°C and 30°C. Storage at 20°C resulted in a significant decrease in the rates of survival and development of stored blastocysts compared to storage at 25°C or 30°C. No differences in survival and development rates were observed between storage at 25°C and 30°C, but the damage to the embryo quality after storage and culture was significantly lower at 25°C than at 30°C. In the third experiment, Cell-S solution was supplemented with β-mercaptoethanol and curcumin, either alone or in combination, as antioxidant agents. Although the supplementation with curcumin did not improve survival, it significantly increased the development rate of stored blastocysts compared with the control blastocysts stored without antioxidants. In conclusion, when porcine blastocysts were stored at 25°C for 24 hr, a Cell-S solution may be effective for maintaining the survival and development of in vitro embryos.
(キーワード)
Animals / Blastocyst / Culture Media / Curcumin / Embryo, Mammalian / Fertilization in Vitro / Swine / Temperature
Qingyi Lin, Anh Quynh Le, Koki Takebayashi, Maki Hirata, Fuminori Tanihara, Osamu Sawamoto, Takeshi Kikuchi and Takeshige Otoi : Short-term preservation of porcine zygotes at ambient temperature using a chemically defined medium., Animal Science Journal, Vol.93, No.1, 2022.
(要約)
We aimed to develop a simple method for the short-term preservation of in vitro-produced porcine zygotes at 25°C for up to 2 days. Firstly, we evaluated the efficiency of three storage solutions to preserve porcine zygotes at 25°C for 24 h. Two of these were commercially available defined media for cell storage (Cell-W and Cell-S), and the third was fetal bovine serum (FBS). Thereafter, we examined the effects of storing the zygotes in the Cell-W solution for 24-72 h at 25°C. The Cell-W solution was the most efficient for 24 h storage of porcine zygotes at 25°C, with no apparent effects on blastocyst quality. However, short-term storage of porcine zygotes for 24 h reduced the blastocyst formation rate compared with the fresh control group. As storage duration increased from 24 to 48 or 72 h, blastocyst formation rates were significantly decreased from 11.3% to 4.4% and 0%, respectively. In conclusion, during zygote storage, the developmental competence to the blastocyst stage decreased with time. Storage of zygotes in chemically defined media did not affect blastocyst quality, but the storage in 100% serum had an adverse effect on developing embryos causing apoptosis.
(キーワード)
Animals / Blastocyst / Culture Media / Fertilization in Vitro / Swine / Temperature / Zygote
Maki Hirata, Manita Wittayarat, Zhao Namula, Anh Quynh Le, Qingyi Lin, Koki Takebayashi, Chommanart Thongkittidilok, Taro Mito, Sayuri Tomonari, Fuminori Tanihara and Takeshige Otoi : Generation of mutant pigs by lipofection-mediated genome editing in embryos., Scientific Reports, Vol.11, No.1, 23806, 2021.
(要約)
The specificity and efficiency of CRISPR/Cas9 gene-editing systems are determined by several factors, including the mode of delivery, when applied to mammalian embryos. Given the limited time window for delivery, faster and more reliable methods to introduce Cas9-gRNA ribonucleoprotein complexes (RNPs) into target embryos are needed. In pigs, somatic cell nuclear transfer using gene-modified somatic cells and the direct introduction of gene editors into the cytoplasm of zygotes/embryos by microinjection or electroporation have been used to generate gene-edited embryos; however, these strategies require expensive equipment and sophisticated techniques. In this study, we developed a novel lipofection-mediated RNP transfection technique that does not require specialized equipment for the generation of gene-edited pigs and produced no detectable off-target events. In particular, we determined the concentration of lipofection reagent for efficient RNP delivery into embryos and successfully generated MSTN gene-edited pigs (with mutations in 7 of 9 piglets) after blastocyst transfer to a recipient gilt. This newly established lipofection-based technique is still in its early stages and requires improvements, particularly in terms of editing efficiency. Nonetheless, this practical method for rapid and large-scale lipofection-mediated gene editing in pigs has important agricultural and biomedical applications.
Chommanart Thongkittidilok, Anh Quynh Le, Qingyi Lin, Koki Takebayashi, Lanh Thi Kim Do, Zhao Namula, Maki Hirata, Fuminori Tanihara and Takeshige Otoi : Effects of individual or in-combination antioxidant supplementation during in vitro maturation culture on the developmental competence and quality of porcine embryos., Reproduction in Domestic Animals = Zuchthygiene, Vol.57, No.3, 314-320, 2021.
(要約)
The oocyte maturation process requires a high supply of energy, which generates reactive oxygen species (ROS), adversely affecting oocyte and embryo development. Balancing ROS by antioxidant supplementation is essential for maintaining oocyte maturation and embryonic quality in vitro. This study aimed to evaluate the impact of four antioxidants: β-mercaptoethanol (β-ME), chlorogenic acid (CGA), curcumin and sericin, when applied individually or in combinations, during oocyte maturation on development of porcine oocytes. Cumulus-oocyte complexes were collected, cultured in maturation medium supplemented with antioxidants for 44 hr and subsequently subjected to in vitro fertilization (IVF) and culture for 7 days. Combining all four (β-ME + CGA + curcumin + sericin) or three (β-ME + CGA + curcumin) antioxidants increased blastocyst formation rates. However, sericin supplementation alone, or in combination with β-ME or CGA, failed to improve blastocyst formation rates. The total cell numbers of blastocysts from the group supplemented with three antioxidants (β-ME + CGA + curcumin) were significantly higher than those from the other groups, except for the curcumin-supplement group. There were no differences in the maturation rates and proportions of oocytes with fragmented DNA between the antioxidant-supplemented and the non-supplemented control groups. In conclusion, supplementation with three antioxidants (β-ME + CGA + curcumin) during the maturation culture enhanced blastocyst formation and improved blastocyst quality.
(キーワード)
Animals / Antioxidants / Blastocyst / Dietary Supplements / Embryonic Development / Fertilization in Vitro / In Vitro Oocyte Maturation Techniques / Oocytes / Swine
Praopilas Phakdeedindan, Manita Wittayarat, Theerawat Tharasanit, Mongkol Techakumphu, Megumi Shimazaki, Rentsenkhand Sambuu, Maki Hirata, Fuminori Tanihara, Masayasu Taniguchi, Takeshige Otoi and Yoko Sato : Aberrant levels of DNA methylation and H3K9 acetylation in the testicular cells of crossbred cattle-yak showing infertility., Reproduction in Domestic Animals = Zuchthygiene, Vol.57, No.3, 304-313, 2021.
(要約)
Although the interspecies hybridization of bovids, such as cattle-yak (Bos taurus × Bos grunniens), has heterosis benefits, the infertility of hybrid males affects the maintenance of dominant traits in subsequent generations. To achieve reproductive capacity, male germ cell development requires coordinated changes in gene expression, including DNA methylation and generalized histone modifications. Although gene expression-related mechanisms underlying hybrid male sterility have been investigated recently, information on the cell types and stage-specific controls remains limited. Here, we used immunohistochemistry and image analyses to evaluate the 5-methylcytosine (5MC) and acetyl-histone H3 Lys9 (AcK9) expression in all spermatogonia and testicular somatic cell types to determine their roles in cattle-yak spermatogenesis. Testicular tissues from yak (1-3 years old) and backcrossed hybrids (2 years old) were used. In yak, the AcK9 expression levels increased in all cell types during maturation, but the 5MC expression levels did not change until reaching 3 years when they increased in all testicular cell types, except spermatogonia. Cattle-yak hybrids showed higher 5MC expression levels and different AcK9 expression levels in all cell types compared to the same-aged yak. These results suggested that both gene modulation by AcK9 and constant levels of DNA methylation are required for spermatogenesis during maturation in yak. Therefore, inappropriate expression levels of both AcK9 and DNA methylation might be the major factors for disruption of normal germ cell development in cattle-yak. Additionally, various modulations occurred depending on the cell type. Further experiments are needed to identify the stage-specific gene expression modulations in each cell type in yak and cattle-yak to potentially solve the infertility issue in crossbreeding.
(キーワード)
Acetylation / Animals / Cattle / Cattle Diseases / DNA Methylation / Infertility, Male / Male / Spermatogenesis / Testis
Zhao Namula, Maki Hirata, Anh Quynh Le, Qingyi Lin, Koki Takebayashi, Naoaki Yoshimura, Fuminori Tanihara, Chommanart Thongkittidilok and Takeshige Otoi : Zona pellucida treatment before CRISPR/Cas9-mediated genome editing of porcine zygotes., Veterinary Medicine and Science, Vol.8, No.1, 164-169, 2021.
(要約)
The blastocyst formation rate of ZP-free zygotes after electroporation was significantly lower (p < 0.05) than that of ZP-intact zygotes. The mutation rate in blastocysts from ZP-weakened zygotes was similar to that in ZP-intact zygotes, whereas ZP removal increased the mutation rate. The mutation efficiency in blastocysts from electroporated zygotes did not differ among ZP treatment groups.
Qingyi Lin, Anh Quynh Le, Koki Takebayashi, Chommanart Thongkittidilok, Manita Wittayarat, Maki Hirata, Fuminori Tanihara and Takeshige Otoi : Timing and duration of lipofection-mediated CRISPR/Cas9 delivery into porcine zygotes affect gene-editing events., BMC Research Notes, Vol.14, No.1, 389, 2021.
(要約)
Zona pellucida (ZP)-free zygotes collected at 5, 10, and 15 h from the start of in vitro fertilization (IVF) were incubated with lipofection reagent, guide RNA (gRNA) targeting GGTA1, and Cas9 for 5 h. Lipofection of zygotes collected at 10 and 15 h from the start of IVF yielded mutant blastocysts. Next, ZP-free zygotes collected at 10 h from the start of IVF were incubated with lipofection reagent, gRNA, and Cas9 for 2.5, 5, 10, or 20 h. The blastocyst formation rate of zygotes treated for 20 h was significantly lower (p < 0.05) than those of the other groups, and no mutant blastocysts were obtained. Moreover, the mutation rates of the resulting blastocysts decreased as the incubation time increased. In conclusion, a lipofection-mediated gene editing system using the CRISPR/Cas9 system in ZP-zygotes is feasible; however, further improvements in the gene editing efficiency are required.
Naoaki Yoshimura, Masayasu Taniguchi, Tsukasa Terazono, Tetsushi Ono, Mitsuhiro Takagi, Yoko Sato, Maki Hirata, Fuminori Tanihara and Takeshige Otoi : Vaginal stimulation enhances ovulation of queen ovaries treated using a combination of eCG and hCG., Veterinary Medicine and Science, Vol.7, No.5, 1569-1574, 2021.
(要約)
Follicular changes throughout the oestrous phase have been poorly documented in queens because of the location and the small size of ovaries. We investigated follicular development in queens treated with a combination of equine chorionic gonadotropin (eCG) and human chorionic gonadotropin (hCG) and evaluated the effects of vaginal stimulation by a tomcat on ovulation induction. A hormonal treatment was administered using a simple crossover design. Four queens were administered 150 IU of eCG (day 1) and 250 IU of hCG on day 5 and 6. Half of the queens were mated with a vasectomised tomcat for 3 days after hCG injection. Ultrasound imaging of the ovaries clamped at a subcutaneous site was performed once a day from day 1 to 7, and on day 13, and the serum concentrations of oestradiol and progesterone were examined on day 1, 5, 7 and 13. The mean number of follicles gradually increased with the eCG treatment and decreased after hCG injection. The ovulation rate of follicles was significantly higher in the vaginal stimulation group (70.0%) than in the control group (42.6%). During the hormonal treatments, the serum concentration of oestradiol and progesterone did not differ between the two groups. Ultrasound imaging of the ovaries clamped at a subcutaneous site showed that eCG and hCG treatment promoted the follicular growth and corpus luteum formation, respectively. The combination of hCG injection with vaginal stimulation by a vasectomised tomcat enhanced the ovulation rate of follicles.
Zhao Namula, Yasuhiro Isumi, Yoko Sato, Anh Quynh Le, Qingyi Lin, Koki Takebayashi, Maki Hirata, Fuminori Tanihara, Chommanart Thongkittidilok and Takeshige Otoi : Improvement of the in vitro fertilization and embryo development using frozen-thawed spermatozoa of microminipigs., Archives Animal Breeding, Vol.64, No.1, 265-271, 2021.
(要約)
This study aimed to compare the quality and the penetration ability of frozen-thawed spermatozoa from three microminipigs and Large White boars and to evaluate the effects of caffeine and heparin as well as the sperm-oocyte co-incubation length on the fertilization and embryonic development in vitro. Results showed that the fertilization rates of spermatozoa from three microminipig boars were significantly lower than those of a Large White boar. In the post-thaw spermatozoa from one of three microminipig boars, the sperm quality, penetration ability, and the oocyte development after in vitro fertilization were significantly lower than those of the spermatozoa from other boars. The caffeine supplementation in the fertilization media increased the rates of fertilization and blastocyst formation for the microminipig spermatozoa with low sperm quality. In addition to caffeine supplementation, the rates of fertilization and blastocyst formation after using microminipig spermatozoa were significantly higher with a 10 h sperm-oocyte co-incubation than with 3 h of co-incubation length. Our results indicate that the differences between the males and the breed influence the quality and fertility of frozen-thawed boar spermatozoa. In conclusion, the presence of caffeine in the in vitro fertilization (IVF) medium and adequate length of sperm-oocyte co-incubation may have beneficial effects for improving IVF results when using microminipig spermatozoa with low quality.
Fuminori Tanihara, Maki Hirata, Thi Nhien Nguyen, Osamu Sawamoto, Takeshi Kikuchi and Takeshige Otoi : One-Step Generation of Multiple Gene-Edited Pigs by Electroporation of the CRISPR/Cas9 System into Zygotes to Reduce Xenoantigen Biosynthesis., International Journal of Molecular Sciences, Vol.22, No.5, 2249, 2021.
(要約)
triple-edited pigs. Immunohistological analyses demonstrated the downregulation of xenoantigens; however, these multiple gene-edited pigs were genetic mosaics that failed to knock out some xenoantigens. Although mosaicism should be resolved, the electroporation technique could become a primary method for the one-step generation of multiple gene modifications in pigs aimed at improving pig-to-human xenotransplantation.
Maki Hirata, Manita Wittayarat, Zhao Namula, Quynh Le Anh, Qingyi Lin, Koki Takebayashi, Chommanart Thongkittidilok, Fuminori Tanihara and Takeshige Otoi : Lipofection-Mediated Introduction of CRISPR/Cas9 System into Porcine Oocytes and Embryos., Animals : An Open Access Journal from MDPI, Vol.11, No.2, 2021.
(要約)
Liposome-mediated gene transfer has become an alternative method for establishing a gene targeting framework, and the production of mutant animals may be feasible even in laboratories without specialized equipment. However, how this system functions in mammalian oocytes and embryos remains unclear. The present study was conducted to clarify whether blastocyst genome editing can be performed by treatment with lipofection reagent, guide RNA, and Cas9 for 5 h without using electroporation or microinjection. A mosaic mutation was observed in blastocysts derived from zona pellucida (ZP)-free oocytes following lipofection treatment, regardless of the target genes. When lipofection treatment was performed after in vitro fertilization (IVF), no significant differences in the mutation rates or mutation efficiency were found between blastocysts derived from embryos treated at 24 and 29 h from the start of IVF. Only blastocysts from embryos exposed to lipofection treatment at 29 h after IVF contained biallelic mutant. Furthermore, there were no significant differences in the mutation rates or mutation efficiency between blastocysts derived from embryos at the 2- and 4-cell stages. This suggests that lipofection-mediated gene editing can be performed in ZP-free oocytes and ZP-free embryos; however, other factors affecting the system efficiency should be further investigated.
Anh Quynh Le, Fuminori Tanihara, Manita Wittayarat, Zhao Namula, Yoko Sato, Qingyi Lin, Koki Takebayashi, Maki Hirata and Takeshige Otoi : Comparison of the effects of introducing the CRISPR/Cas9 system by microinjection and electroporation into porcine embryos at different stages., BMC Research Notes, Vol.14, No.1, 7, 2021.
(要約)
First, we designed five guide RNAs (gRNAs) targeting the B4GALNT2 gene and evaluated mutation efficiency by introducing each gRNA with Cas9 protein into zygotes by electroporation. Next, the optimized gRNA with Cas9 protein was introduced into 1-cell and 2-cell stage embryos by either microinjection or electroporation. The sequence of gRNA affected the bi-allelic mutation rate and mutation efficiency of blastocysts derived from electroporated embryos. Microinjection significantly decreased the cleavage rates in each embryonic stage and blastocyst formation rates in 2-cell stage embryos compared with electroporation (p < 0.05). However, the bi-allelic mutation rate and mutation efficiency of blastocysts from the 1-cell stage embryos edited using microinjection were significantly higher (p < 0.05) than those of blastocysts from the 2-cell stage embryos edited by both methods. These results indicate that the gene editing method and embryonic stage for gene editing may affect the genotype and mutation efficiency of the resulting embryos.
Kim Thi Lanh Do, Manita Wittayarat, Yoko Sato, Kaywalee Chatdarong, Theerawat Tharasanit, Mongkol Techakumphu, Maki Hirata, Fuminori Tanihara, Masayasu Taniguchi and Takeshige Otoi : Comparison of blastocyst development between cat-cow and cat-pig interspecies somatic cell nuclear transfer embryos under the treatment of Trichostatin A., Biology bulletin of the Russian Academy of Sciences, Vol.48, 107-117, 2021.
Nguyen Nhien Thi, Wittayarat Manita, Zhao Namula, Sato Yoko, Anh Le Quynh, Lin Qingyi, Takebayashi Koki, Fuminori Tanihara, Maki Hirata and Takeshige Otoi : Chlorogenic acid and insulin-transferrin-selenium supplementation during in vitro maturation enhances the developmental competence of interspecies chimera blastocysts following cell injection., Journal of Applied Animal Research, Vol.49, No.1, 486-491, 2021.
Manita Wittayarat, Maki Hirata, Zhao Namula, Yoko Sato, T Nhien Nguyen, A Quynh Le, Qingyi Lin, Koki Takebayashi, Fuminori Tanihara and Takeshige Otoi : Introduction of a point mutation in the KRAS gene of in vitro fertilized porcine zygotes via electroporation of the CRISPR/Cas9 system with single-stranded oligodeoxynucleotides., Animal Science Journal, Vol.92, No.1, e13534, 2021.
(要約)
This study aimed to investigate the efficiency of KRAS gene editing via CRISPR/Cas9 delivery by electroporation and analyzed the effects of the non-homologous end-joining pathway inhibitor Scr7 and single-stranded oligodeoxynucleotide (ssODN) homology arm length on introducing a point mutation in KRAS. Various concentrations (0-2 µM) of Scr7 were evaluated; all concentrations of Scr7 including 0 µM resulted in the generation of blastocysts with a point mutation and the wild-type sequence or indels. No significant differences in the blastocyst formation rates of electroporated zygotes were observed among ssODN homology arm lengths, irrespective of the gRNA (gRNA1 and gRNA2). The proportion of blastocysts carrying a point mutation with or without the wild-type sequence and indels was significantly higher in the ssODN20 group (i.e., the group with a ssODN homology arm of 20 bp) than in the ssODN60 group (gRNA1: 25.7% vs. 5.4% and gRNA2: 45.5% vs. 5.9%, p < .05). In conclusion, the CRISPR/Cas9 delivery with ssODN via electroporation is feasible for the generation of point mutations in porcine embryos. Further studies are required to improve the efficiency and accuracy of the homology-directed repair.
Fuminori Tanihara, Maki Hirata, Thi Nhien Nguyen, Le Anh Quynh, Manita Wittayarat, Mokhamad Fahrudin, Takayuki Hirano and Takeshige Otoi : Generation of CD163-edited pig via electroporation of the CRISPR/Cas9 system into porcine in vitro-fertilized zygotes., Animal Biotechnology, Vol.32, 147-154, 2021.
Maki Hirata, Manita Wittayarat, Fuminori Tanihara, Yoko Sato, Zhao Namula, Anh Quynh Le, Qingyi Lin, Koki Takebayashi and Takeshige Otoi : One-step genome editing of porcine zygotes through the electroporation of a CRISPR/Cas9 system with two guide RNAs., In Vitro Cellular & Developmental Biology. Animal, Vol.56, No.8, 614-621, 2020.
(要約)
In the present study, we investigated whether electroporation could be used for one-step multiplex CRISPR/Cas9-based genome editing, targeting IL2RG and GHR in porcine embryos. First, we evaluated and selected guide RNAs (gRNAs) by analyzing blastocyst formation rates and genome editing efficiency. This was performed in embryos electroporated with one of three different gRNAs targeting IL2RG or one of two gRNAs targeting GHR. No significant differences in embryo development rates were found between control embryos and those subjected to electroporation, irrespective of the target gene. Two gRNAs targeting IL2RG (nos. 2 and 3) contributed to an increased biallelic mutation rate in porcine blastocysts compared with gRNA no. 1. There were no significant differences in the mutation rates between the two gRNAs targeting GHR. In our next experiment, the mutation efficiency and the development of embryos simultaneously electroporated with gRNAs targeting IL2RG and GHR were investigated. Similar embryo development rates were observed between embryos electroporated with two gRNAs and control embryos. When IL2RG-targeting gRNA no. 2 was used with GHR-targeting gRNAs no. 1 or no. 2, a significantly higher double biallelic mutation rate was observed than with IL2RG-targeting gRNA no. 3. In conclusion, we demonstrate the feasibility of using electroporation to transfer multiple gRNAs and Cas9 into porcine zygotes, enabling the double biallelic mutation of multiple genes with favorable embryo survival.
Fuminori Tanihara, Maki Hirata, Thi Nhien Nguyen, Osamu Sawamoto, Takeshi Kikuchi, Masako Doi and Takeshige Otoi : Efficient generation of GGTA1-deficient pigs by electroporation of the CRISPR/Cas9 system into in vitro-fertilized zygotes., BMC Biotechnology, Vol.20, No.1, 40, 2020.
(要約)
We established GGTA1-modified pigs with high efficiency by introducing a CRISPR/Cas9 system into zygotes via electroporation. Multiple gene modifications, including knock-ins of human genes, in porcine zygotes via electroporation may further improve the application of the technique in pig-to-human xenotransplantation.
Maki Hirata, Manita Wittayarat, Zhao Namula, Anh Quynh Le, Qingyi Lin, Thi Nhien Nguyen, Koki Takebayashi, Yoko Sato, Fuminori Tanihara and Takeshige Otoi : Evaluation of multiple gene targeting in porcine embryos by the CRISPR/Cas9 system using electroporation., Molecular Biology Reports, Vol.47, No.7, 5073-5079, 2020.
(要約)
The CRISPR/Cas9 system now allows for unprecedented possibilities of genome editing. However, there are some limitations, including achieving efficient one-step multiple genome targeting to save costs, time, and ensure high quality. In the present study, we investigated the efficiency of one-step multiple gene modification by electroporation in porcine zygotes using pooled guide RNAs (gRNAs) targeting CMAH, GHR, GGTA1, and PDX1. We first selected the best-performing gRNA from three different designs for each gene based on the effect on embryo development and mutation efficiency. The three gRNAs showed equivalent effects on the rates of blastocyst formation in each targeted gene; however, gRNAs CMAH #2, GHR #3, GGTA1 #3, and PDX1 #3 showed the highest biallelic mutation rate, although the total mutation rate of PDX1 #3 was significantly lower than that of PDX1 #1. Therefore, CMAH #2, GHR #3, GGTA1 #3, and PDX1 #1 were used as a mixture in electroporation to further clarify whether multiple genes can be targeted simultaneously. Individual sequencing of 43 blastocysts at the target sites of each gene showed mutations in one and two target genes in twenty-four (55.8%) and nine (20.9%) blastocysts, respectively. No mutation was detected in any target gene in ten (23.3%) blastocysts and no blastocysts had a mutation in three or more target genes. These results indicate that electroporation could effectively deliver multiple gRNAs and Cas9 protein into porcine zygotes to target multiple genes in a one-step process. However, the technique requires further development to increase the success rate of multiple gene modification.
Fuminori Tanihara, Maki Hirata, Nhien Nguyen Thi, Le Anh Quynh, Takayuki Hirano and Takeshige Otoi : Generation of viable PDX1 gene-edited founder pigs as providers of nonmosaics., Molecular Reproduction and Development, Vol.87, No.4, 471-481, 2020.
(要約)
Pancreatic duodenal homeobox 1 (PDX1) is a crucial gene for pancreas development during the fetal period. PDX1-modified pigs have the potential to be used as a model of diabetes mellitus. However, the severe health problems caused by the PDX1 mutation limit phenotypic studies of PDX1-modified pigs as diabetes models. In this study, we generated PDX1-modified pigs by the CRISPR/Cas9 system introduced into zygotes via electroporation and investigated the mosaicism, phenotypes, and inheritance of the resulting pigs. After the embryo transfer of PDX1-modified zygotes, nine mutant piglets were delivered. Two piglets were apancreatic biallelic mutants. For the other seven piglets, the ratio of mutant alleles to total alleles was 17.5-79.7%. Two mutant piglets with high mutation rates (67.7% and 79.7%) exhibited hypoplasia of the pancreas, whereas the other five piglets were healthy. One of the male mutant piglets was further analyzed. The ejaculated semen from the pig contained PDX1-mutant spermatozoa and the pig showed normal reproductive ability. In conclusion, the frequency of the PDX1 mutation is presumed to relate to pancreas formation, and PDX1 mutant founder pigs generated from zygotes introduced to the CRISPR/Cas9 system can serve as providers of nonmosaics to contribute to medical research on diabetes mellitus.
T N Nguyen, Maki Hirata, Fuminori Tanihara, Y Sato, Z Namula, Le Trong Quang, M Wittayarat, M Fahrudin and Takeshige Otoi : In vitro Development of Zona Pellucida-free Porcine Zygotes Cultured Individually after Vitrification., Cryo Letters, Vol.41, No.2, 86-91, 2020.
(要約)
Our results suggest that the removal of the ZP does not cause detrimental effects to the development of vitrified-warmed zygotes.
In Mongolia, yak (Bos grunniens) are able to live in alpine areas and their products greatly influence the lives of the local people. Increased vigour in hybridized yak and cattle can offer benefits for livestock farmers. However, male hybrids show reproductive defects resulting from spermatogenesis arrest, affecting the conservation and maintenance of dominant traits in the next generation. The underlying mechanisms involved in hybrid cattle-yak infertility have recently been investigated; however, the genetic cause is still unclear. Androgens and androgen receptor (AR) signalling are required for spermatogenesis. We, therefore, evaluated the expression of AR, 3β-hydroxysteroid dehydrogenase (3βHSD) and 5α-reductase 2 (SRD5A2) in Leydig cells to investigate their function in cattle-yak spermatogenesis. Testicular tissues from yaks (1-3 years old) and hybrids (F1-F3, 2 years old) were collected and subjected to immunohistochemistry and image analyses to investigate the expression of each parameter in the Leydig cells. After maturation at 2 years, the expression levels of AR increased and the levels of 3βHSD decreased, but the SRD5A2 levels remained constant in yak. However, the cattle-yak hybrid F2 showed immature testicular development and significantly different expression levels of AR and 3βHSD compared with mature yak. These results suggest that the decreased expression of AR and increased expression of 3βHSD in the Leydig cells of cattle-yak hybrid testes may represent one of the causes of infertility. Our study might help in solving the problem of infertility in crossbreeding.
Namula Zhao, Yoko Sato, Manita Wittayarat, Quynh Le Anh, Thi Nhien Nguyen, Qingyi Lin, Maki Hirata, Fuminori Tanihara and Takeshige Otoi : Curcumin supplementation in maturation medium improves the maturation, fertilisation, and developmental competence of porcine oocytes., Acta Veterinaria Hungarica, Vol.68, No.3, 298-304, 2020.
(要約)
This study was conducted to determine the effects of supplementing the maturation medium with the antioxidant curcumin on the in vitro maturation (IVM), fertilisation and development of porcine oocytes. Curcumin supplementation was performed at concentrations of 0, 5, 10, 20, and 40 µM. At concentrations of 5-20 µM, curcumin had significant positive effects (P < 0.05) on maturation and fertilisation rates compared to the non-treated group. Of the groups cultured with 5-20 µM curcumin, the number of oocytes with DNA-fragmented nuclei after IVM was significantly lower than in groups matured without curcumin. Moreover, curcumin supplementation at 10 µM also gave a significantly higher rate of blastocyst formation compared with oocytes matured without curcumin. Increasing the curcumin concentration to 40 µM yielded negative effects on fertilisation and embryonic development compared with the groups treated with lower concentrations of curcumin. Supplementation with 10 µM curcumin had beneficial effects on the oocyte maturation rate and DNA fragmentation index compared to the non-treated group both in the presence and absence of hydrogen peroxide. These results indicate that curcumin supplementation at a suitable concentration (10 µM) is potentially useful for porcine oocyte culture systems, in terms of protecting oocytes from various forms of oxidative stress.
(キーワード)
Animals / Blastocyst / Cell Proliferation / Curcumin / DNA Fragmentation / Dose-Response Relationship, Drug / Embryo Culture Techniques / Hydrogen Peroxide / In Vitro Oocyte Maturation Techniques / Oocytes / Oxidative Stress / Sus scrofa
A Quynh Le, Maki Hirata, T Nhien Nguyen, Koki Takebayashi, Manita Wittayarat, Yoko Sato, Zhao Namula, Masahiro Nii, Fuminori Tanihara and Takeshige Otoi : Effects of electroporation treatment using different concentrations of Cas9 protein with gRNA targeting Myostatin (MSTN) genes on the development and gene editing of porcine zygotes., Animal Science Journal, Vol.91, No.1, e13386, 2020.
(要約)
This study was conducted to investigate the effect of seven concentrations of Cas9 protein (0, 25, 50, 100, 200, 500, and 1,000 ng/µl) on the development and gene editing of porcine embryos. This included the target editing and off-target effect of embryos developed from zygotes that were edited via electroporation of the Cas9 protein with guide RNA targeting Myostatin genes. We found that the development to blastocysts of electroporated zygotes was not affected by the concentration of Cas9 protein. Although the editing rate, which was defined as the ratio of edited blastocysts to total examined blastocysts, did not differ with Cas9 protein concentration, the editing efficiency, which was defined as the frequency of indel mutations in each edited blastocyst, was significantly decreased in the edited blastocysts from zygotes electroporated with 25 ng/µl of Cas9 protein compared with that of blastocysts from zygotes electroporated with higher Cas9 protein concentrations. Moreover the frequency of indel events at the two possible off-target sites was not significantly different with different concentrations of Cas9 protein. These results indicate that the concentration of Cas9 protein affects gene editing efficiency in embryos but not the embryonic development, gene editing rate, and non-specific cleavage of off-target sites.
Maki Hirata, Manita Wittayarat, Takayuki Hirano, Thi Nhien Nguyen, Le Anh Quynh, Zhao Namula, Mokhamad Fahrudin, Fuminori Tanihara and Takeshige Otoi : The relationship between embryonic development and the efficiency of target mutations in porcine endogenous retroviruses (PERVs) pol genes in porcine embryos., Animals : An Open Access Journal from MDPI, Vol.9, No.9, E593, 2019.
Namula Zhao, Manita Wittayarat, Maki Hirata, Hirano Takayuki, Nguyen Thi Nhien, Le Anh Quynh, Fahrudin Mokhamad, Fuminori Tanihara and Takeshige Otoi : Genome mutation after the introduction of the gene editing by electroporation of Cas9 protein (GEEP) system into bovine putative zygotes, In Vitro Cellular & Developmental Biology. Animal, Vol.55, No.8, 598-603, 2019.
(要約)
The present study was designed to investigate the effects of voltage strength on embryonic developmental rate and mutation efficiency in bovine putative zygotes during electroporation with the CRISPR/Cas9 system to target the MSTN gene at different time points after insemination. Results showed that there was no significant interaction between electroporation time and voltage strength on the embryonic cleavage and blastocyst formation rates. However, increasing the voltage strength to 20 V/mm to electroporate the zygotes at 10 h after the start of insemination yielded significantly lower blastocyst formation rates (P<0.05) than those of the 10-V/mm electroporated zygotes. Mutation efficiency was then assessed in individual blastocysts by DNA sequence analysis of the target sites in the MSTN gene. A positive correlation between mutation rate and voltage strength was observed. The mutation efficiency in mutant blastocysts was significantly higher in the zygotes electroporated with 20 V/mm at 10 h after the start of insemination (P<0.05) than in the zygotes electroporated at 15 h, irrespective of the voltage strength. We also noted that a certain number of blastocysts from zygotes that were electroporated with more than 15 V/mm at 10 h (4.8-16.7%) and 20 V/mm at 15 h (4.8%) were biallelic mutants. Our results suggest that the voltage strength during electroporation as well as electroporation time certainly have effects on the embryonic developmental rate and mutation efficiency in bovine putative zygotes.
Fuminori Tanihara, Maki Hirata, Morikawa Shigeki, Thi Nhien Nguyen, Le Anh Quynh, Hirano Takayuki, Fukumi Yoshiyuki, Abe Toshiaki and Takeshige Otoi : The effects of electroporation on viability and quality of in vivo-derived bovine blastocysts, The Journal of Reproduction and Development, Vol.65, No.5, 475-479, 2019.
(要約)
The introduction of exogenous molecules into embryos is required for analyses of molecular dynamics and specific gene functions during early embryonic development. Electroporation is an effective method to transport exogenous molecules into cells, but is rarely used in bovine embryos. First, we evaluated the viability of in vivo-derived bovine blastocysts after electroporation with fluorescein (FAM) labeled-oligonucleotides with varying pulse numbers (3, 5, 7, and 10), while keeping the pulse duration at 1 msec and the electric field of 20 V/mm. Next, we examined the effects of zona pellucida status on blastocyst quality after electroporation, by comparing the average diameter of blastocysts before and after electroporation using blastocysts with intact zona pellucida and hatching/hatched blastocysts. Electroporation successfully introduced exogenous molecules into in vivo-derived bovine blastocysts without loss of viability. Moreover, the status of the zona pellucida may be associated with the quality of blastocysts after electroporation.
Fuminori Tanihara, Maki Hirata, Satoru Iizuka, Shinya Sairiki, Masahiro Nii, Nhien Thi Nguyen, Quynh Anh Le, Takayuki Hirano and Takeshige Otoi : Relationship among ovarian follicular status, developmental competence of oocytes, and anti-M llerian hormone levels: A comparative study in Japanese wild boar crossbred gilts and Large White gilts., Animal Science Journal, Vol.90, No.6, 712-718, 2019.
(要約)
The aim of this study was to investigate the ovarian follicular development, developmental competence of oocytes, and plasma anti-M llerian hormone (AMH) levels of Japanese wild boar crossbred (wild hybrid) gilts, whose litter size is inferior to that of European breeds. Ovary and plasma samples were collected from two different breeds of gilts (wild hybrid and Large White breeds). The ovaries from the wild hybrid gilts had a lower average numbers of secondary follicles and vesicular follicles in ovarian cross-sections and of good quality oocytes collected from ovarian follicles as compared with those from Large White gilts (p < 0.05). The development rate to the blastocyst stage of good quality oocytes after in vitro maturation, fertilization and culture was also lower (p < 0.05) in wild hybrid gilts than in Large White gilts. Plasma AMH levels with >0.16 ng/ml were detected in 8.3% of the examined wild hybrid gilts and 33% of the Large White gilts. These results indicate that the low reproductive performance of wild hybrid breed may result in part from low numbers of vesicular follicles and good quality oocytes, and low developmental competence of oocytes. Moreover, plasma AMH levels may support low number of vesicular follicles in ovaries of wild hybrid gilts.
Nhien Nguyen Thi, Maki Hirata, Fuminori Tanihara, Takayuki Hirano, Quynh Anh Le, Masahiro Nii and Takeshige Otoi : Hypothermic storage of porcine zygotes in serum supplemented with chlorogenic acid., Reproduction in Domestic Animals = Zuchthygiene, Vol.54, No.5, 750-755, 2019.
(要約)
The current study was conducted to investigate the effects of 100% foetal bovine serum (FBS) and 100% porcine follicular fluid (pFF) as a storage medium on the developmental competence of porcine zygotes stored at 25 C for 24 hr. Moreover, we evaluated the additive effects of chlorogenic acid (CGA) in the storage medium. When in vitro-produced zygotes were stored at 25 C for 24 hr in tubes containing either tissue culture medium (TCM) 199 supplemented with 1 mg/ml bovine serum albumin (BSA), 100% of FBS or 100% of pFF, the rate of blastocyst formation was significantly higher in 100% of FBS than in BSA-containing TCM 199. When the effects of CGA supplementation in 100% of FBS on the development of zygotes stored at 25 C for 24 hr was evaluated, more zygotes stored with 50 M CGA developed to blastocysts compared with the other concentrations of CGA. When the formation date and quality of blastocysts derived from zygotes stored in 100% of FBS supplemented with 50 M CGA were investigated, the highest ratio of blastocysts formation in the storage group appeared 1 day later than in the non-stored control group. However, a higher proportion of blastocysts with apoptotic nuclei was observed in the stored group as compared to the non-stored group. In conclusion, 100% of FBS is available for a short storage medium of porcine zygotes. The supplementation of 50 M CGA into the storage medium improves the rates of blastocyst formation of zygotes after storage, but the quality of embryos from the stored zygotes remains to be improved.
Zhao Namula, Fuminori Tanihara, Manita Wittayarat, Maki Hirata, Nhien Thi Nguyen, Takayuki Hirano, Quynh Anh Le, Masahiro Nii and Takeshige Otoi : Effects of Tris (hydroxymethyl) aminomethane on the quality of frozen-thawed boar spermatozoa., Acta Veterinaria Hungarica, Vol.67, No.1, 106-114, 2019.
(要約)
Tris (hydroxymethyl) aminomethane (Tris) has been used as a pH regulator for buffering the pH of dilution extenders for boar semen, such as the Modena extender. The purpose of the present study was to assess the effects of Tris supplementation at different concentrations (0, 8, 24 and 72 M) into the freezing extender on the quality and fertilising capacity of frozen-thawed boar spermatozoa. The results showed that the supplementation of 24 M of Tris gave significantly higher percentages of sperm viability and plasma membrane integrity than those of the control group at any time point of assessment (0 h and 3 h post-thawing) (P < 0.05). However, there were no significant differences in the acrosome integrity parameter among the groups. Higher percentages of sperm motility were observed in the spermatozoa cryopreserved with 24 M of Tris compared to the control groups when the samples were analysed 0 h after thawing (P < 0.05). However, an increase of the Tris concentration to 72 M did not enhance the sperm motility parameters. The total numbers of fertilised oocytes and blastocysts obtained with spermatozoa frozen with 24 M Tris were significantly higher than those of the control group without Tris (P < 0.05). In conclusion, the supplementation of 24 M Tris into the freezing extender contributes to a better boar sperm quality and fertilising capacity after the process of freezing and thawing.
Maki Hirata, Fuminori Tanihara, Manita Wittayarat, Takayuki Hirano, Nhien Thi Nguyen, Quynh Anh Le, Zhao Namula, Masahiro Nii and Takeshige Otoi : Genome mutation after introduction of the gene editing by electroporation of Cas9 protein (GEEP) system in matured oocytes and putative zygotes., In Vitro Cellular & Developmental Biology. Animal, Vol.55, No.4, 237-242, 2019.
(要約)
The application of CRISPR/Cas9 strategy promises to rapidly increase the production of genetically engineered animals since it yields stably integrated transgenes. In the present study, we investigated the efficiency of target mutations after electroporation with the CRISPR/Cas9 system using sgRNAs to target the MSTN or FGF10 genes in porcine-matured oocytes and putative zygotes. Effects of pulse number (3-7 pulse repetitions) during electroporation on the embryonic development and mutation efficiency were also investigated. Our results showed that the cleavage rate of matured oocytes with electroporation treatment significantly decreased as compared with electroporated putative zygotes (p < 0.05). Moreover, the rates of blastocyst formation from oocytes/zygotes electroporated with more than 5 pulses decreased. Mutation efficiency was then assessed after sequencing the target sites in individual blastocysts derived from oocytes/zygotes electroporated by 3 and 5 pulses. No bi-allelic mutations in all examined blastocysts were observed in this study. There were no differences in the mutation rates (50-60%) between blastocysts derived from matured oocytes electroporated by 3 and 5 pulses, irrespective of targeting gene. In the targeting MSTN gene, however, the mutation rate (12.5%) of blastocysts derived from putative zygotes electroporated by 3 pulses tended to be lower than that (60%) from 5-pulsed electroporated putative zygotes. These data indicate that the type of eggs may influence not only their development after electroporation treatment but also the mutation rate in the resulting blastocysts.
Fuminori Tanihara, Maki Hirata, Nhien Thi Nguyen, Quynh Anh LE, Takayuki Hirano and Takeshige Otoi : Effects of concentration of CRISPR/Cas9 components on genetic mosaicism in cytoplasmic microinjected porcine embryos., The Journal of Reproduction and Development, Vol.65, No.3, 209-214, 2019.
(要約)
Cytoplasmic microinjection (CI) of the CRISPR/Cas9 system enabled the induction of site-specific mutations in porcine zygotes and resulting pigs. However, mosaicism is a serious problem for genetically modified pigs. In the present study, we investigated suitable timing and concentration of CRISPR/Cas9 components for introduction into oocytes/zygotes by CI, to reduce mosaicism in the resulting blastocysts. First, we introduced 20 ng/ l of Cas9 protein and guide RNA (gRNA), targeting the -1,3-galactosyltransferase (GalT) gene in oocytes before in vitro fertilization (IVF), in zygotes after IVF, or in oocytes/zygotes before and after IVF, twice. CI treatment had no detrimental effects on blastocyst formation rates. The highest value of the rate of mutant blastocysts was observed in zygotes injected after IVF. Next, we injected Cas9 protein and gRNA into zygotes after IVF at a concentration of 20 ng/ l each (20 ng/ l group) or 100 ng/ l each (100 ng/ l group). The ratio of the number of blastocysts that carried mutations to the total number of blastocysts examined in the 100 ng/ l group was significantly higher (P < 0.05) than that in the 20 ng/ l group. Although no blastocysts from the 20 ng/ l group carried a biallelic mutation, 16.7% of blastocysts from the 100 ng/ l group carried a biallelic mutation. In conclusion, increasing the concentration of Cas9 protein and gRNA is effective in generating biallelic mutant blastocysts. To reduce mosaicism, however, further optimization of the timing of CI, and the concentration of CRISPR/Cas9 components, is needed.
Fuminori Tanihara, Maki Hirata, Nhien T. Nguyen, Quynh A. Le, Takayuki Hirano, Tatsuya Takemoto, Michiko Nakai, Dai-Ichiro Fuchimoto and Takeshige Otoi : Generation of PDX-1 mutant porcine blastocysts by introducing CRISPR/Cas9-system into porcine zygotes via electroporation., Animal Science Journal, Vol.90, No.1, 55-61, 2018.
(要約)
Recently, we established the GEEP ("gene editing by electroporation of Cas9 protein") method, in which the CRISPR/Cas9 system, consisting of a Cas9 protein and single guide RNA (sgRNA), is introduced into pig zygotes by electroporation and thus induces highly efficient targeted gene disruption. In this study, we examined the effects of sgRNA on the blastocyst formation of porcine embryos and evaluated their genome-editing efficiency. To produce an animal model for diabetes, we targeted PDX-1 (pancreas duodenum homeobox 1), a gene that is crucial for pancreas development during the fetal period and whose monoallelic disruption impairs insulin secretion. First, Cas9 protein with different sgRNAs that targeted distinct sites in the PDX-1 exon 1 was introduced into in vitro-fertilized zygotes by the GEEP method. Of the six sgRNAs tested, three sgRNAs (sgRNA1, 2, and 3) successfully modified PDX-1 gene. The blastocyst formation rate of zygotes edited with sgRNA3 was significantly (p < 0.05) lower than that of control zygotes without the electroporation treatment. Our study indicates that the GEEP method can be successfully used to generate PDX-1 mutant blastocysts, but the development and the efficiency of editing the genome of zygotes may be affected by the sgRNA used for CRISPR/Cas9 system.
Fuminori Tanihara, Maki Hirata, Nhien Thi Nguyen, Quynh Anh Le, Takayuki Hirano, Tatsuya Takemoto, Michiko Nakai, Dai-Ichiro Fuchimoto and Takeshige Otoi : Generation of a TP53-modified porcine cancer model by CRISPR/Cas9-mediated gene modification in porcine zygotes via electroporation., PLoS ONE, Vol.13, No.10, e0206360, 2018.
(要約)
TP53 (which encodes p53) is one of the most frequently mutated genes in cancers. In this study, we generated TP53-mutant pigs by gene editing via electroporation of the Cas9 protein (GEEP), a process that involves introducing the Cas9 protein and single-guide RNA (sgRNA) targeting exon 3 and intron 4 of TP53 into in vitro-fertilized zygotes. Zygotes modified by the sgRNAs were transferred to recipients, two of which gave birth to a total of 11 piglets. Of those 11 piglets, 9 survived. Molecular genetic analysis confirmed that 6 of 9 live piglets carried mutations in TP53, including 2 piglets with no wild-type (WT) sequences and 4 genetically mosaic piglets with WT sequences. One mosaic piglet had 142 and 151 bp deletions caused by a combination of the two sgRNAs. These piglets were continually monitored for 16 months and three of the genome-edited pigs (50%) exhibited various tumor phenotypes that we presumed were caused by TP53 mutations. Two mutant pigs with no WT sequences developed mandibular osteosarcoma and nephroblastoma. The mosaic pig with a deletion between targeting sites of two sgRNAs exhibited malignant fibrous histiocytoma. Tumor phenotypes of TP53 mosaic mutant pigs have not been previously reported. Our results indicated that the mutations caused by gene editing successfully induced tumor phenotypes in both TP53 mosaic- and bi-allelic mutant pigs.
Maki Hirata, Fuminori Tanihara, Masayasu Taniguchi, Mitsuhiro Takagi, Tsukasa Terazono and Takeshige Otoi : Follicular development of canine ovaries stimulated by a combination treatment of eCG and hCG., Veterinary Medicine and Science, 2018.
(要約)
Ovarian follicular dynamics is not well known in dogs. Imaging of ovaries is technically difficult; however, ovaries clamped at a subcutaneous site can more easily be monitored using ultrasound imaging. This study investigated the follicular development of canine ovaries stimulated by hormone treatment using ultrasound imaging of the ovaries clamped at a subcutaneous site. Oestrus was induced using subcutaneous administration of 500 IU equine chorionic gonadotropin (eCG) and 1000 IU human chorionic gonadotropin (hCG) (eCG/hCG). Five bitches were given 1000 IU hCG 11 days after eCG/hCG administration. Examinations with ovarian ultrasonography using a 7.5-MHz sector transducer, vaginal cytology, and assays of serum oestrogen and progesterone were performed daily until 20 days after eCG/hCG administration. Serosanguineous vaginal discharges and vaginal cytology of two of the bitches were observed. New follicular growth (>1.0 mm in diameter) was observed in all bitches from 2 to 8 days after eCG/hCG administration. The mean diameter of follicles and maximum numbers of follicles per ovary ranged from 2.8 to 5.5 mm and 4 to 16, respectively. The elevation in oestrogen concentrations after eCG/hCG administration was observed in all bitches, and elevation in progesterone concentration (>2 ng mL ) was observed in three bitches. However, no follicles ovulated until 9 days after hCG administration. In conclusion, although the number of examined bitches were limited, follicular growth in ovaries clamped at a subcutaneous site can be monitored using ultrasound imaging. Ovarian ultrasonography showed that eCG/hCG administration induced new follicular growth and hCG administration induced increases in oestrogen concentrations but not ovulation by hCG administration.
Maki Hirata, Fuminori Tanihara, Taniguchi Masayasu, Takagi Mitsuhiro, Terazono Tsukasa and Takeshige Otoi : Viability of canine ovaries autografted to different peripheral sites, The International Journal of Applied Research in Veterinary Medicine, Vol.16, No.2, 140-148, 2018.
Zhao Namula, Maki Hirata, Manita Wittayarat, Fuminori Tanihara, Nhien Nguyen Thi, Takayuki Hirano, Masahiro Nii and Takeshige Otoi : Effects of chlorogenic acid and caffeic acid on the quality of frozen-thawed boar sperm., Reproduction in Domestic Animals = Zuchthygiene, 2018.
(要約)
Chlorogenic acid (CGA) and caffeic acid (CA) are potent antioxidants that are mostly found in coffee beans. This study aimed to investigate the effects of CGA and CA supplementation during semen freezing on the quality of frozen-thawed boar spermatozoa. The antioxidants CGA and CA were added to a semen extender to achieve final concentrations of 50, 100, 200 and 400 µM. Supplementation of 100 µM CGA and CA yielded a significantly higher percentage of sperm viability (increased by 8%-10%) and plasma membrane integrity (increased by 4%-6%) than the control groups without the antioxidants at 0 and 3 hr after thawing (p < 0.05). At a concentration of 100 µM, CGA and CA also yielded beneficial effects on total and progressive sperm motility. Increases of CGA and CA concentrations to more than 200 µM did not enhance any sperm quality parameters. When the sperm penetrability and oocyte development by spermatozoa frozen with CGA and CA were evaluated, CGA and CA supplementations had no positive effects on the percentages of total fertilization, monospermic fertilization, cleavage and blastocyst formation. In conclusion, the supplementation of 100 µM CGA and CA during sperm freezing improved certain sperm parameters including motility, viability and plasma membrane integrity.
Thanh-Van Nguyen, Manita Wittayarat, Kim Lanh Thi Do, Van Thanh Nguyen, Masahiro Nii, Zhao Namula, Toshiki Kunihara, Fuminori Tanihara, Maki Hirata and Takeshige Otoi : Effects of chlorogenic acid (CGA) supplementation during in vitro maturation culture on the development and quality of porcine embryos with electroporation treatment after in vitro fertilization., Animal Science Journal, Vol.89, No.8, 1207-1213, 2018.
(要約)
Electroporation is the technique of choice to introduce an exogenous gene into embryos for transgenic animal production. Although this technique is practical and effective, embryonic damage caused by electroporation treatment remains a major problem. This study was conducted to evaluate the optimal culture system for electroporation-treated porcine embryos by supplementation of chlorogenic acid (CGA), a potent antioxidant, during in vitro oocyte maturation. The oocytes were treated with various concentrations of CGA (0, 10, 50, and 100 μmol/L) through the duration of maturation for 44 hr. The treated oocytes were then fertilized, electroporated at 30 V/mm with five 1 msec unipolar pulses, and subsequently cultured in vitro until development into the blastocyst stage. Without electroporation, the treatment with 50 μmol/L CGA had useful effects on the maturation rate of oocytes, the total cell number, and the apoptotic nucleus indices of blastocysts. When the oocytes were electroporated after in vitro fertilization, the treatment with 50 μmol/L CGA supplementation significantly improved the rate of oocytes that developed into blastocysts and reduced the apoptotic nucleus indices (4.7% and 7.6, respectively) compared with those of the untreated group (1.4% and 13.0, respectively). These results suggested that supplementation with 50 μmol/L CGA during maturation improves porcine embryonic development and quality of electroporation-treated embryos.
Fuminori Tanihara, Maki Hirata, Thi Nguyen Nhien, Takayuki Hirano, Toshiki Kunihara and Takeshige Otoi : Effect of ferulic acid supplementation on the developmental competence of porcine embryos during in vitro maturation., The Journal of Veterinary Medical Science, Vol.80, No.6, 1007-1011, 2018.
(要約)
The value of laboratory and genetically-modified pigs is becoming increasingly clear; however, their in vitro development remains inefficient. Trans-ferulic acid (trans-FA) is an aromatic compound that is abundant in plant cell walls, and which exhibits antioxidant effects in vitro. Trans-FA is known to improve sperm viability and motility; however, its effects on porcine oocytes are unknown. Our aim was to investigate the effects of trans-FA supplementation during in vitro maturation on the meiotic and developmental competence of porcine oocytes. Oocytes were matured either without (control) or with trans-FA (10, 100 and 1,000 µM), fertilized, and cultured in vitro for 7 days. The maturation rate of oocytes cultured with 10 µM trans-FA (81.6%) was significantly higher than that of controls (65.0%; P<0.05). The fertilization rate of oocytes matured with 10 µM trans-FA (57.4%) was also significantly higher than that of controls (32.7%) and oocytes cultured with other concentrations (33.1% and 22.7% for 100 and 1,000 µM, respectively; P<0.05). Moreover, the blastocyst formation rate of oocytes matured with 10 µM trans-FA (6.9%) was significantly higher than that of controls (2.3%; P<0.05). Our results suggest that in vitro maturation with 10 µM trans-FA is beneficial for the in vitro production of porcine embryos and has the potential to improve production system.
V T Nguyen, Fuminori Tanihara, Maki Hirata, Takayuki Hirano, Katsutoshi Nishio, T Do L Kim, V T Nguyen, M Nii and Takeshige Otoi : Effects of Antifreeze Protein Supplementation on the Development of Porcine Morulae Stored at Hypothermic Temperatures., Cryo Letters, Vol.39, No.2, 131-136, 2018.
(要約)
Supplementation of AFP type III (1.0 microgram per mL) maintained the quality of embryos stored at 25C, but did not have beneficial effects on the development of embryos stored at hypothermic temperatures.
Megumi Shimazaki, Urasoko Saki, Tanaka Masako, Sato Yoko, Fuminori Tanihara, Maki Hirata, Taniguchi Masayasu, Takagi Mitsuhiro and Takeshige Otoi : Effects of Orvus Es Paste (OEP) on the viability of bull spermatozoa after double freezing and thawing., The International Journal of Applied Research in Veterinary Medicine, Vol.16, 32-38, 2018.
Katsutoshi Nishio, Fuminori Tanihara, T-V Nguyen, Toshiki Kunihara, M Nii, Maki Hirata, Tatsuya Takemoto and Takeshige Otoi : Effects of voltage strength during electroporation on the development and quality of in vitro-produced porcine embryos., Reproduction in Domestic Animals = Zuchthygiene, Vol.53, No.2, 313-318, 2017.
(要約)
This study was conducted to determine suitable conditions for an experimental method in which the CRISPR/Cas9 system is introduced into in vitro-produced porcine zygotes by electroporation. In the first experiment, when putative zygotes derived from in vitro fertilization (IVF) were electroporated by either unipolar or bipolar pulses, keeping the voltage, pulse duration and pulse number fixed at 30 V/mm, 1 msec and five repeats, respectively, the rate of blastocyst formation from zygotes electroporated by bipolar pulses decreased compared to zygotes electroporated by unipolar pulses. In the second experiment, the putative zygotes were electroporated by electroporation voltages ranging from 20 V/mm-40 V/mm with five 1-msec unipolar pulses. The rate of cleavage and blastocyst formation of zygotes electroporated at 40 V/mm was significantly lower (p < .05) than that of zygotes electroporated at less than 30 V/mm. Moreover, the apoptotic nuclei indices of blastocysts derived from zygotes electroporated by voltages greater than 30 V/mm significantly increased compared with those from zygotes electroporated by voltages less than 25 V/mm (p < .05). When zygotes were electroporated with Cas9 mRNA and single-guide RNA (sgRNA) targeting site in the FGF10 exon 3, the proportions of blastocysts with targeted genomic sequences were 7.7% (2/26) and 3.6% (1/28) in the embryos derived from zygotes electroporated at 25 V/mm and 30 V/mm, respectively. Our results indicate that electroporation at 25 V/mm may be an acceptable condition for introducing Cas9 mRNA and sgRNA into pig IVF zygotes under which the viability of the embryos is not significantly affected.
Nobuyuki Nakajima, Tetsuro Tamaki, Maki Hirata, Shuichi Soeda, Masahiro Nitta, Akio Hoshi and Toshiro Terachi : Purified human skeletal muscle-derived stem cells enhance the repair and regeneration in the damaged urethra., Transplantation, Vol.101, No.10, 2312-2320, 2017.
(要約)
The transplantation of Sk-34 and Sk-DN/29 cells is potentially useful for the reconstitution of postoperative damage of the urethral rhabdosphincter and nerve-vascular networks.
Tetsuro Tamaki, Maki Hirata, Nobuyuki Nakajima, Kosuke Saito, Hiroyuki Hashimoto, Shuichi Soeda, Yoshiyasu Uchiyama and Masahiko Watanabe : A long-gap peripheral nerve injury therapy using human skeletal muscle-derived stem cells (Sk-SCs): An achievement of significant morphological, numerical and functional recovery., PLoS ONE, Vol.11, No.11, e0166639, 2016.
(要約)
Losses in vital functions of the somatic motor and sensory nervous system are induced by severe long-gap peripheral nerve transection injury. In such cases, autologous nerve grafts are the gold standard treatment, despite the unavoidable sacrifice of other healthy functions, whereas the prognosis is not always favorable. Here, we use human skeletal muscle-derived stem cells (Sk-SCs) to reconstitute the function after long nerve-gap injury. Muscles samples were obtained from the amputated legs from 9 patients following unforeseen accidents. The Sk-SCs were isolated using conditioned collagenase solution, and sorted as CD34+/45- (Sk-34) and CD34-/45-/29+ (Sk-DN/29+) cells. Cells were separately cultured/expanded under optimal conditions for 2 weeks, then injected into the athymic nude mice sciatic nerve long-gap model (7-mm) bridging an acellular conduit. After 8-12 weeks, active cell engraftment was observed only in the Sk-34 cell transplanted group, showing preferential differentiation into Schwann cells and perineurial/endoneurial cells, as well as formation of the myelin sheath and perineurium/endoneurium surrounding regenerated axons, resulted in 87% of numerical recovery. Differentiation into vascular cell lineage (pericyte and endothelial cells) were also observed. A significant tetanic tension recovery (over 90%) of downstream muscles following electrical stimulation of the sciatic nerve (at upper portion of the gap) was also achieved. In contrast, Sk-DN/29+ cells were completely eliminated during the first 4 weeks, but relatively higher numerical (83% vs. 41% in axon) and functional (80% vs. 60% in tetanus) recovery than control were observed. Noteworthy, significant increase in the formation of vascular networks in the conduit during the early stage (first 2 weeks) of recovery was observed in both groups with the expression of key factors (mRNA and protein levels), suggesting the paracrine effects to angiogenesis. These results suggested that the human Sk-SCs may be a practical source for autologous stem cell therapy following severe peripheral nerve injury.
Hiroyuki Hashimoto, Tetsuro Tamaki, Maki Hirata, Yoshiyasu Uchiyama, Masato Sato and Joji Mochida : Reconstitution of the complete rupture in musculotendinous junction using skeletal muscle-derived multipotent stem cell sheet-pellets as a "bio-bond"., PeerJ, Vol.4, e2231, 2016.
(要約)
Background. Significant and/or complete rupture in the musculotendinous junction (MTJ) is a challenging lesion to treat because of the lack of reliable suture methods. Skeletal muscle-derived multipotent stem cell (Sk-MSC) sheet-pellets, which are able to reconstitute peripheral nerve and muscular/vascular tissues with robust connective tissue networks, have been applied as a "bio-bond". Methods. Sk-MSC sheet-pellets, derived from GFP transgenic-mice after 7 days of expansion culture, were detached with EDTA to maintain cell-cell connections. A completely ruptured MTJ model was prepared in the right tibialis anterior (TA) of the recipient mice, and was covered with sheet-pellets. The left side was preserved as a contralateral control. The control group received the same amount of the cell-free medium. The sheet-pellet transplantation (SP) group was further divided into two groups; as the short term (4-8 weeks) and long term (14-18 weeks) recovery group. At each time point after transplantation, tetanic tension output was measured through the electrical stimulation of the sciatic nerve. The behavior of engrafted GFP(+) tissues and cells was analyzed by fluorescence immunohistochemistry. Results. The SP short term recovery group showed average 64% recovery of muscle mass, and 36% recovery of tetanic tension output relative to the contralateral side. Then, the SP long term recovery group showed increased recovery of average muscle mass (77%) and tetanic tension output (49%). However, the control group showed no recovery of continuity between muscle and tendon, and demonstrated increased muscle atrophy, with coalescence to the tibia during 4-8 weeks after operation. Histological evidence also supported the above functional recovery of SP group. Engrafted Sk-MSCs primarily formed the connective tissues and muscle fibers, including nerve-vascular networks, and bridged the ruptured tendon-muscle fiber units, with differentiation into skeletal muscle cells, Schwann cells, vascular smooth muscle, and endothelial cells. Discussion. This bridging capacity between tendon and muscle fibers of the Sk-MSC sheet-pellet, as a "bio-bond," represents a possible treatment for various MTJ ruptures following surgery.
Head and neck cancer is often diagnosed at advanced stages, and surgical resection with wide margins is generally indicated, despite this treatment being associated with poor postoperative quality of life (QOL). We have previously reported on the therapeutic effects of skeletal muscle-derived multipotent stem cells (Sk-MSCs), which exert reconstitution capacity for muscle-nerve-blood vessel units. Recently, we further developed a 3D patch-transplantation system using Sk-MSC sheet-pellets. The aim of this study is the application of the 3D Sk-MSC transplantation system to the reconstitution of facial complex nerve-vascular networks after severe damage. Mouse experiments were performed for histological analysis and rats were used for functional examinations. The Sk-MSC sheet-pellets were prepared from GFP-Tg mice and SD rats, and were transplanted into the facial resection model (ST). Culture medium was transplanted as a control (NT). In the mouse experiment, facial-nerve-palsy (FNP) scoring was performed weekly during the recovery period, and immunohistochemistry was used for the evaluation of histological recovery after 8 weeks. In rats, contractility of facial muscles was measured via electrical stimulation of facial nerves root, as the marker of total functional recovery at 8 weeks after transplantation. The ST-group showed significantly higher FNP (about three fold) scores when compared to the NT-group after 2-8 weeks. Similarly, significant functional recovery of whisker movement muscles was confirmed in the ST-group at 8 weeks after transplantation. In addition, engrafted GFP+ cells formed complex branches of nerve-vascular networks, with differentiation into Schwann cells and perineurial/endoneurial cells, as well as vascular endothelial and smooth muscle cells. Thus, Sk-MSC sheet-pellet transplantation is potentially useful for functional reconstitution therapy of large defects in facial nerve-vascular networks.
Tetsuro Tamaki, Yoshiyasu Uchiyama, Maki Hirata, Hiroyuki Hashimoto, Nobuyuki Nakajima, Kosuke Saito, Toshiro Terachi and Joji Mochida : Therapeutic isolation and expansion of human skeletal muscle-derived stem cells for the use of muscle-nerve-blood vessel reconstitution., Frontiers in Physiology, Vol.6, 165, 2015.
(要約)
Skeletal muscle makes up 40-50% of body mass, and is thus considered to be a good adult stem cell source for autologous therapy. Although, several stem/progenitor cells have been fractionated from mouse skeletal muscle showing a high potential for therapeutic use, it is unclear whether this is the case in human. Differentiation and therapeutic potential of human skeletal muscle-derived cells (Sk-Cs) was examined. Samples (5-10 g) were obtained from the abdominal and leg muscles of 36 patients (age, 17-79 years) undergoing prostate cancer treatment or leg amputation surgery. All patients gave informed consent. Sk-Cs were isolated using conditioned collagenase solution, and were then sorted as CD34(-)/CD45(-)/CD29(+) (Sk-DN/29(+)) and CD34(+)/CD45(-) (Sk-34) cells, in a similar manner as for the previous mouse Sk-Cs. Both cell fractions were appropriately expanded using conditioned culture medium for about 2 weeks. Differentiation potentials were then examined during cell culture and in vivo transplantation into the severely damaged muscles of athymic nude mice and rats. Interestingly, these two cell fractions could be divided into highly myogenic (Sk-DN/29(+)) and multipotent stem cell (Sk-34) fractions, in contrast to mouse Sk-Cs, which showed comparable capacities in both cells. At 6 weeks after the separate transplantation of both cell fractions, the former showed an active contribution to muscle fiber regeneration, but the latter showed vigorous engraftment to the interstitium associated with differentiation into Schwann cells, perineurial/endoneurial cells, and vascular endothelial cells and pericytes, which corresponded to previous observations with mouse SK-Cs. Importantly, mixed cultures of both cells resulted the reduction of tissue reconstitution capacities in vivo, whereas co-transplantation after separate expansion showed favorable results. Therefore, human Sk-Cs are potentially applicable to therapeutic autografts and show multiple differentiation potential in vivo.
Tetsuro Tamaki, Maki Hirata and Yoshiyasu Uchiyama : Qualitative alteration of peripheral motor system begins prior to appearance of typical sarcopenia syndrome in middle-aged rats., Frontiers in Aging Neuroscience, Vol.6, 296, 2014.
(要約)
Qualitative changes in the peripheral motor system were examined using young, adult, middle-aged, and old-aged rats in order to assess before and after the appearance of sarcopenia symptoms. Significant loss of muscle mass and strength, and slow-type fiber grouping with a loss of innervated nerve fibers were used as typical markers of sarcopenia. Dynamic twitch and tetanus tension and evoked electromyogram (EEMG) were measured via electrical stimulation through the sciatic nerve under anesthesia using our force-distance transducer system before and after sciatectomy. Digital and analog data sampling was performed and shortening and relaxing velocity of serial twitches was calculated with tension force. Muscle tenderness in passive stretching was also measured as stretch absorption ability, associated with histological quantitation of muscle connective tissues. The results indicated the validity of the present model, in which old-aged rats clearly showed the typical signs of sarcopenia, specifically in the fast-type plantaris muscles, while the slow-type soleus showed relatively mild syndromes. These observations suggest the following qualitative alterations as the pathophysiological mechanism of sarcopenia: (1) reduction of shortening and relaxing velocity of twitch; (2) decline of muscle tenderness following an increase in the connective tissue component; (3) impaired recruitment of motor units (MUs) (sudden depression of tetanic force and EEMG) in higher stimulation frequencies over 50-60 Hz; and (4) easy fatigability in the neuromuscular junctions. These findings are likely to be closely related to significant losses in fast-type MUs, muscle strength and contraction velocity, which could be a causative factor in falls in the elderly. Importantly, some of these symptoms began in middle-aged rats that showed no other signs of sarcopenia. Thus, prevention should be started in middle age that could be retained relatively higher movement ability.
Loss of vital functions in the somatic motor and sensory nervous systems can be induced by severe peripheral nerve transection with a long gap following trauma. In such cases, autologous nerve grafts have been used as the gold standard, with the expectation of activation and proliferation of graft-concomitant Schwann cells associated with their paracrine effects. However, there are a limited number of suitable sites available for harvesting of nerve autografts due to the unavoidable sacrifice of other healthy functions. To overcome this problem, the potential of skeletal muscle-derived multipotent stem cells (Sk-MSCs) was examined as a novel alternative cell source for peripheral nerve regeneration. Cultured/expanded Sk-MSCs were injected into severely crushed sciatic nerve corresponding to serious neurotmesis. After 4 weeks, engrafted Sk-MSCs preferentially differentiated into not only Schwann cells, but also perineurial/endoneurial cells, and formed myelin sheath and perineurium/endoneurium, encircling the regenerated axons. Increased vascular formation was also observed, leading to a favorable blood supply and waste product excretion. In addition, engrafted cells expressed key neurotrophic and nerve/vascular growth factor mRNAs; thus, endocrine/paracrine effects for the donor/recipient cells were also expected. Interestingly, skeletal myogenic capacity of expanded Sk-MSCs was clearly diminished in peripheral nerve niche. The same differentiation and tissue reconstitution capacity of Sk-MSCs was sufficiently exerted in the long nerve gap bridging the acellular conduit, which facilitated nerve regeneration/reconnection. These effects represent favorable functional recovery in Sk-MSC-treated mice, as demonstrated by good corduroy walking. We also demonstrated that these differentiation characteristics of the Sk-MSCs were comparable to native peripheral nerve-derived cells, whereas the therapeutic capacities were largely superior in Sk-MSCs. Therefore, Sk-MSCs can be a novel/suitable alternative cell source for healthy nerve autografts.
These results indicate that the vigorous skeletal myogenic potential of Sk-MSCs was clearly reduced in the sheet pellet preparation and this method may be a useful adjuvant for nerve-vascular regeneration in various tissue engineering applications.
Tetsuro Tamaki, Kayoko Tono, Yoshiyasu Uchiyama, Yoshinori Okada, Maki Masuda, Shuichi Soeda, Masahiro Nitta and Akira Akatsuka : Origin and hierarchy of basal lamina-forming and -non-forming myogenic cells in mouse skeletal muscle in relation to adhesive capacity and Pax7 expression in vitro., Cell and Tissue Research, Vol.344, No.1, 147-168, 2011.
(要約)
As a novel approach to distinguish skeletal myogenic cell populations, basal lamina (BL) formation of myogenic cells was examined in the mouse compensatory enlarged plantaris muscles in vivo and in fiber-bundle cultures in vitro. MyoD(+) myogenic cells located inside the regenerative muscle fiber BL were laminin(-) but interstitial MyoD(+) cells were laminin(+). This was also confirmed by electron microscopy as structural BL formation. Similar trends were observed in the fiber-bundle cultures including satellite cells and interstitial myogenic cells and laminin(+) myogenic cells predominantly showed non-adhesive (non-Ad) behavior with Pax7(-), whereas laminin(-) cells were adhesive (Ad) with Pax7(+). Moreover, non-Ad/laminin(+) and Ad/laminin(-) myotubes were also observed and the former type showed spontaneous contractions, while the latter type did not. The origin and hierarchy of Ad/Pax7(+)/laminin(-) and non-Ad/Pax7(-)/laminin(+) myogenic cells were also examined using skeletal muscle interstitium-derived CD34(+)/45(-) (Sk-34) and CD34(-)/45(-) (Sk-DN) multipotent stem cells, which were composed of non-committed myogenic cells with a few (<1%) Pax7(+) cells in the Sk-DN cells at fresh isolation. Both cell types were separated by Ad/non-Ad capacity in repetitive culture. As expected, both Ad/Pax7(+)/laminin(-) and non-Ad/Pax7(-)/laminin(+) myogenic cells consistently appeared in the Ad and non-Ad cell culture. However, Ad/Pax7(+)/laminin(-) cells were repeatedly detected in the non-Ad cell culture, while the opposite phenomenon did not occur. This indicates that the source of non-Ad/ Pax7(-)/laminin(+) myogenic cells was present in the Sk-34 and Sk-DN stem cells and they were able to produce Ad/ Pax7(+)/ laminin(-) myogenic cells during myogenesis as primary myoblasts and situated hierarchically upstream of the latter cells.
BACKGROUND.: Postoperative neurogenic bladder dysfunction is a major complication of radical hysterectomy for cervical cancer and is mainly caused by unavoidable damage to the bladder branch of the pelvic plexus (BBPP) associated with colateral blood vessels. Thus, we attempted to reconstitute disrupted BBPP and blood vessels using skeletal muscle-derived multipotent stem cells that show synchronized reconstitution capacity of vascular, muscular, and peripheral nervous systems. METHODS.: Under pentobarbital anesthesia, intravesical pressure by electrical stimulation of BBPP was measured as bladder function. The distal portion of BBPP with blood vessels was then cut unilaterally (experimental neurogenic bladder model). Measurements were performed before, immediately after, and at 4 weeks after transplantation as functional recovery. Stem cells were obtained from the right soleus and gastrocnemius muscles after enzymatic digestion and cell sorting as CD34/45 (Sk-34) and CD34/45 (Sk-DN). Suspended cells were autografted around the damaged region, whereas medium alone and CD45 cells were transplanted as control groups. To determine the morphological contribution of the transplanted cells, stem cells obtained from green fluorescent protein transgenic mouse muscles were transplanted into a nude rat model and were examined by immunohistochemistry and immunoelectron microscopy. RESULTS.: At 4 weeks after surgery, the transplantation group showed significantly higher functional recovery ( approximately 80%) than the two controls ( approximately 28% and 24%). The transplanted cells showed an incorporation into the damaged peripheral nerves and blood vessels after differentiation into Schwann cells, perineurial cells, vascular smooth muscle cells, pericytes, and fibroblasts around the bladder. CONCLUSION.: Transplantation of multipotent Sk-34 and Sk-DN cells is potentially useful for the reconstitution of damaged BBPP.
Tetsuro Tamaki, Yoshiyasu Uchiyama, Yoshinori Okada, Kayoko Tono, Maki Masuda, Masahiro Nitta, Akio Hoshi and Akira Akatsuka : Clonal differentiation of skeletal muscle-derived CD34(-)/45(-) stem cells into cardiomyocytes in vivo., Stem Cells and Development, Vol.19, No.4, 503-512, 2010.
(要約)
The differentiation and/or therapeutic potential of skeletal muscle-derived stem cells for cardiac infarction have been studied extensively for use in cellular cardiomyoplasty, as injured cardiomyocytes exhibit limited regenerative capacity. We previously reported cardio-myogenic differentiation of skeletal muscle-derived CD34+/45(-) (Sk-34) stem cells after therapeutic transplantation. However, the clonal differentiation potential of these cells remains unknown. Here, we show that skeletal muscle-derived CD34(-)/45(-) (Sk-DN) stem cells, which are situated upstream of Sk-34 cells in the same lineage, exhibit clonal differentiation into cardiomyocytes after single cell-derived single-sphere implantation into myocardium. Sk-DN cells were enzymatically isolated from green fluorescent protein (GFP) transgenic mice and purified by flow cytometry, and were then clonally cultured in collagen-based medium with bFGF and EGF after clonal cell sorting. Single cell-derived single-sphere colonies of Sk-DN cells were directly implanted into the wild-type mouse myocardium. At 4 weeks after implantation, donor cells exhibited typical cardiomyocyte structure with the formation of gap-junctions between donor and recipient cells. Expression of specific mRNAs for cardiomyocytes, such as cardiac actin and GATA-4, Nkx2-5, Isl-1, Mef2, and Hand2, were also seen in clonal cell cultures of Sk-DN cells. Cell fusion-independent differentiation was also confirmed by bulk cell transplantation using Cre- and loxP (enhanced GFP)-mice. We conclude that Sk-DN cells can give rise to cardiac muscle cells clonally, and that skeletal muscle includes a practical cell source for cellular cardiomyoplasty.
Kazunari Yamashita, Atsushi Suzuki, Yoshinori Satoh, Mariko Ide, Yoshiko Amano, Maki Masuda-Hirata, K Yukiko Hayashi, Keisuke Hamada, Kazuhiro Ogata and Shigeo Ohno : The 8th and 9th tandem spectrin-like repeats of utrophin cooperatively form a functional unit to interact with polarity-regulating kinase PAR-1b., Biochemical and Biophysical Research Communications, Vol.391, No.1, 812-817, 2009.
(要約)
Utrophin is a widely expressed paralogue of dystrophin, the protein responsible for Duchenne muscular dystrophy. Utrophin is a large spectrin-like protein whose C-terminal domain mediates anchorage to a laminin receptor, dystroglycan (DG). The rod domain, composed of 22 spectrin-like repeats, connects the N-terminal actin-binding domain and the C-terminal DG binding domain, and thus mediates molecular linkage between intracellular F-actin and extracellular basement membrane. Previously, we demonstrated that a cell polarity-regulating kinase, PAR-1b, interacts with the utrophin-DG complex, and positively regulates the interaction between utrophin and DG. In this study, we demonstrate that the 8th and 9th spectrin-like repeats (R8 and R9) of utrophin cooperatively form a PAR-1b-interacting domain, and that Ser1258 within R9 is specifically phosphorylated by PAR-1b. Substitution of Ser1258 to alanine reduces the interaction between utrophin and DG, suggesting that the Ser1258 phosphorylation contributes to the stabilization of the utrophin-DG complex. Interestingly, PAR-1b also binds and phosphorylates R8-9 of dystrophin, and colocalizes with dystrophin at the skeletal muscle membrane. These results reveal a novel function of the rod domain of utrophin beyond that of a passive structural linker connecting the N- and C-terminal domain.
Maki Masuda-Hirata, Atsushi Suzuki, Yoshiko Amano, Kazunari Yamashita, Mariko Ide, Tomoyuki Yamanaka, Michihiro Sakai, Michihiro Imamura and Shigeo Ohno : Intracellular polarity protein PAR-1 regulates extracellular laminin assembly by regulating the dystroglycan complex., Genes to Cells, Vol.14, No.7, 835-850, 2009.
(要約)
Cell polarity depends on extrinsic spatial cues and intrinsic polarity proteins including PAR-aPKC proteins. In mammalian epithelial cells, cell-cell contacts provide spatial cues that activate the aPKC-PAR-3-PAR-6 complex to establish the landmark of the initial cellular asymmetry. PAR-1, a downstream target of the aPKC-PAR-3-PAR-6 complex, mediates further development of the apical and basolateral membrane domains. However, the relationships between the PAR-aPKC proteins and other extrinsic spatial cues provided by the extracellular matrix (ECM) remain unclear. Here, we show that PAR-1 colocalizes with laminin receptors and is required for the assembly of extracellular laminin on the basal surface of epithelial cells. Furthermore, PAR-1 regulates the basolateral localization of the dystroglycan (DG) complex, one of the laminin receptors essential for basement membrane formation. We also show that PAR-1 interacts with the DG complex and is required for the formation of a functional DG complex. These results reveal the presence of a novel inside-out pathway in which an intracellular polarity protein regulates the ECM organization required for epithelial cell polarity and tissue morphogenesis.
Tetsuro Tamaki, Yoshinori Okada, Yoshiyasu Uchiyama, Kayoko Tono, Maki Masuda, Masahiro Nitta, Akio Hoshi and Akira Akatsuka : Skeletal muscle-derived CD34+/45- and CD34-/45- stem cells are situated hierarchically upstream of Pax7+ cells., Stem Cells and Development, Vol.17, No.4, 653-667, 2008.
(要約)
The hierarchical relationship of skeletal muscle-derived multipotent stem cells sorted as CD34(+)/CD45(-) (Sk-34) and CD34(-)/CD45(-) (Sk-DN) cells, which have synchronized reconstitution capacities for blood vessels, peripheral nerves, and muscle fibers, was examined. Expression of Sca-1 and CD34 (typical state of freshly isolated Sk-34 cells) in Sk-DN cells was examined using in vitro culture and in vivo cell implantation. Sk-DN cells sequentially expressed Sca-1 and CD34 during cell culture showing self-maintenance and/or self-renewal-like behavior, and are thus considered hierarchically upstream of Sk-34 cells in the same lineage. Sk-34 and Sk-DN cells were further divided into small and large cell fractions by cell sorting. Immunocytochemistry using anti-Pax7 was performed at the time of isolation (before culture) and revealed that only 1% of cells in the large Sk-DN cell fraction were positive for Pax7, while Sk-34 cells and 99% of Sk-DN cells were negative for Pax7. Therefore, putative satellite cells were possibly present in the large Sk-DN cell fraction. However, serial analysis of Pax7 expression by RT-PCR and immunocytochemistry for single and 2 to >40 clonally proliferated Sk-34 and Sk-DN cells revealed that both cell types expressed Pax7 after several asymmetric cellular divisions during clonal-cell culture. In addition, production of satellite cells was seen after muscle fiber formation following Sk-34 or Sk-DN cell transplantation into damaged muscle, and even in the nonmuscle tissue environment (beneath the renal capsule). Thus, Sk-DN cells are situated upstream of Sk-34 cells and both cells can produce Pax7+ cells (putative satellite cells) after cellular division.
Tetsuro Tamaki, Yoshinori Okada, Yoshiyasu Uchiyama, Kayoko Tono, Maki Masuda, Mika Wada, Akio Hoshi and Akira Akatsuka : Synchronized reconstitution of muscle fibers, peripheral nerves and blood vessels by murine skeletal muscle-derived CD34(-)/45 (-) cells., Histochemistry and Cell Biology, Vol.128, No.4, 349-360, 2007.
(要約)
In order to establish the practical isolation and usage of skeletal muscle-derived stem cells (MDSCs), we determined reconstitution capacity of CD34(-)/CD45(-) (Sk-DN) cells as a candidate somatic stem cell source for transplantation. Sk-DN cells were enzymatically isolated from GFP transgenic mice (C57/BL6N) skeletal muscle and sorted using fluorescence activated cell sorting (FACS), and expanded by collagen gel-based cell culture with bFGF and EGF. The number of Sk-DN cells was small after sorting (2-8 x 10(4)); however, the number increased 10-20 fold (2-16 x 10(5)) after 6 days of expansion culture, and the cells maintained immature state and multipotency, expressing mRNAs for mesodermal and ectodermal cell lineages. Transplantation of expanded Sk-DN cells into the severe muscle damage model (C57/BL6N wild-type) resulted in the synchronized reconstitution of blood vessels, peripheral nerves and muscle fibers following significant recovery of total muscle mass (57%) and contractile function (55%), whereas the non-cell-transplanted control group showed around 20% recovery in both factors. These reconstitution capacities were supported by the intrinsic plasticity of Sk-DN cells that can differentiate into muscular (skeletal muscle), vascular (pericyte, endothelial cell and smooth muscle) and peripheral nerve (Schwann cells and perineurium) cell lineages that was revealed by transplantation to non-muscle tissue (beneath renal capsule) and fluorescence in situ hybridization (FISH) analysis.
Tetsuro Tamaki, Yoshinori Okada, Yoshiyasu Uchiyama, Kayoko Tono, Maki Masuda, Mika Wada, Akio Hoshi, Tetsuya Ishikawa and Akira Akatsuka : Clonal multipotency of skeletal muscle-derived stem cells between mesodermal and ectodermal lineage., Stem Cells, Vol.25, No.9, 2283-2290, 2007.
(要約)
The differentiation potential of skeletal muscle-derived stem cells (MDSCs) after in vitro culture and in vivo transplantation has been extensively studied. However, the clonal multipotency of MDSCs has yet to be fully determined. Here, we show that single skeletal muscle-derived CD34-/CD45- (skeletal muscle-derived double negative [Sk-DN]) cells exhibit clonal multipotency that can give rise to myogenic, vasculogenic, and neural cell lineages after in vivo single cell-derived single sphere implantation and in vitro clonal single cell culture. Muscles from green fluorescent protein (GFP) transgenic mice were enzymatically dissociated and sorted based on CD34 and CD45. Sk-DN cells were clone-sorted into a 96-well plate and were cultured in collagen-based medium with basic fibroblast growth factor and epidermal growth factor for 14 days. Individual colony-forming units (CFUs) were then transplanted directly into severely damaged muscle together with 1 x 10(5) competitive carrier Sk-DN cells obtained from wild-type mice muscle expanded for 5 days under the same culture conditions using 35-mm culture dishes. Four weeks after transplantation, implanted GFP+ cells demonstrated differentiation into endothelial, vascular smooth muscle, skeletal muscle, and neural cell (Schwann cell) lineages. This multipotency was also confirmed by expression of mRNA markers for myogenic (MyoD, myf5), neural (Musashi-1, Nestin, neural cell adhesion molecule-1, peripheral myelin protein-22, Nucleostemin), and vascular (alpha-smooth muscle actin, smoothelin, vascular endothelial-cadherin, tyrosine kinase-endothelial) stem cells by clonal (single-cell derived) single-sphere reverse transcription-polymerase chain reaction. Approximately 70% of clonal CFUs exhibited expression of all three cell lineages. These findings support the notion that Sk-DN cells are a useful tool for damaged muscle-related tissue reconstitution by synchronized vasculogenesis, myogenesis, and neurogenesis.
Mitsuhiro Kurata, Maki Hirata, Shoji Watabe, Masashi Miyake, Y Susumu Takahashi and Yoshimi Yamamoto : Expression, purification, and inhibitory activities of mouse cytotoxic T-lymphocyte antigen-2alpha., Protein Expression and Purification, Vol.32, No.1, 119-125, 2003.
(要約)
Cytotoxic T-lymphocyte antigen-2 (CTLA-2) is a novel cysteine proteinase inhibitor. The protein sequence is homologous to the proregion of mouse cathepsin L. Here, we report the expression, purification, and characterization of recombinant CTLA-2 (CTLA-2alpha). CTLA-2alpha was cloned into the pET16b vector and the plasmid was transformed into Escherichia coli strain BL21 (DE3) pLysS. The recombinant CTLA-2alpha was highly expressed and purified by His-Bind affinity chromatography, Factor Xa digestion, and hydrophobic chromatography. Throughout these procedures, 3mg recombinant CTLA-2alpha was obtained from 450 ml of bacterial culture medium. The purified protein exhibited inhibitory activities towards certain cysteine proteinases and was properly refolded, as indicated by circular dichroism spectroscopy. Recombinant CTLA-2alpha fully inhibited Bombyx cysteine proteinase (BCP) (overall Kd (Ki*) = 0.23 nM) and and cathepsin L (overall Kd (Ki*) = 0.38 nM). Inhibition of cathepsin H ( Ki = 86 nM) and papain ( Ki = 560 nM) was much weaker, while inhibition of cathepsin B was negligible ( Ki > 1 microM). Our results indicate that mouse CTLA-2alpha is a selective inhibitor of the cathepsin L-like cysteine proteinases.
Fuminori Tanihara, Maki Hirata and Takeshige Otoi : Current status of the application of gene editing in pigs., The Journal of Reproduction and Development, Vol.67, No.3, 177-187, Apr. 2021.
(要約)
Genetically modified animals, especially rodents, are widely used in biomedical research. However, non-rodent models are required for efficient translational medicine and preclinical studies. Owing to the similarity in the physiological traits of pigs and humans, genetically modified pigs may be a valuable resource for biomedical research. Somatic cell nuclear transfer (SCNT) using genetically modified somatic cells has been the primary method for the generation of genetically modified pigs. However, site-specific gene modification in porcine cells is inefficient and requires laborious and time-consuming processes. Recent improvements in gene-editing systems, such as zinc finger nucleases, transcription activator-like effector nucleases, and the clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein (CRISPR/Cas) system, represent major advances. The efficient introduction of site-specific modifications into cells via gene editors dramatically reduces the effort and time required to generate genetically modified pigs. Furthermore, gene editors enable direct gene modification during embryogenesis, bypassing the SCNT procedure. The application of gene editors has progressively expanded, and a range of strategies is now available for porcine gene engineering. This review provides an overview of approaches for the generation of genetically modified pigs using gene editors, and highlights the current trends, as well as the limitations, of gene editing in pigs.
B Liu, Takeshige Otoi, TAKEBAYASHI Kohki, Wittayarat Manita, Maki Hirata, Q. Lin, N. Torigoe, Megumi Nagahara, Namula Zhao and Fuminori Tanihara : Trial to generate chimeric pigs with high-frequency renal tumors via aggregation of gene-edited blastomeres., 27th Annual ESDAR Conference, Sep. 2024.
2.
Li Qingyi, K. Takebayashi, N. Torigoe, Liu Bin, Maki Hirata, Fuminori Tanihara, Megumi Nagahara and Takeshige Otoi : Genome editing of porcine zygotes through the lipofection of a CRISPR/Cas9 system with two guide RNAs., The 50th Conference of the International Embryo Technology Society, Jan. 2024.
3.
Lin Qingyi, Maki Hirata, K Takebayashi, N. Torigoe, M. Nagahara and Takeshige Otoi : Comparison of chemically mediated CRISPR/Cas9 gene-editing systems using different transfection mechanisms on the mutation of porcine embryos., The 17th Transgenic Technology Meeting (TT2022), Helsinki, Finland, Sep. 2022.
4.
Maki Hirata, Miki Matsuoka, Takuma Hashimoto, Takamichi Oura, Yo Ohnuki, Chika Yoshida, Ayaka Minemura, Daiki Miura, Kentaro Oka, Motomichi Takahashi and Fumiki Morimatsu : Effect of Clostridium butyricum MIYAIRI 588 supplementation on the intestinal microbiota and meat quality of fattening pigs., 68th International Congress of Meat Science and Technology (ICoMST2022), Kobe, Aug. 2022.
5.
Maki Hirata, Fuminori Tanihara, Nguyen Thi Nhien, Le Anh Quynh, Hirano Takayuki and Takeshige Otoi : Effects of CRISPR/Cas9-mediated gene targeting of porcine endogenous retrovirus on the developmental competence of porcine embryos, The 15th Transgenic Technology Meeting (TT2019), Kobe, Apr. 2019.
6.
Nguyen Thi Nhien, Fuminori Tanihara, Maki Hirata, Hirano Takayuki, Le Anh Quynh and Takeshige Otoi : Efficiency of gene editing by electroporation of Cas9 protein (GEEP) to generate GGTA1-modified pigs, The 15th Transgenic Technology Meeting (TT2019), Kobe, Apr. 2019.
7.
Le Anh Quynh, Maki Hirata, Fuminori Tanihara, Nguyen Thi Nhien, Hirano Takayuki and Takeshige Otoi : Effect of Cas9 protein levels on genomic mutations using the gene editing by electroporation of Cas9 protein (GEEP) system in putative zygotes, The 15th Transgenic Technology Meeting (TT2019), Kobe, Apr. 2019.
8.
Fuminori Tanihara, Maki Hirata, Nguyen Thi Nhien, Le Anh Quynh, Hirano Takayuki and Takeshige Otoi : Assessment of PDX-1-deficient pigs generated using the CRISPR/Cas9 system introduced into porcine zygotes via electroporation, The 15th Transgenic Technology Meeting (TT2019), Kobe, Apr. 2019.
国内講演発表:
1.
Lin Qingyi, Takebayashi Koki, Torigoe Nanaka, Liu Bin, Maki Hirata, Megumi Nagahara and Takeshige Otoi : Efficient gene editing of pig embryos by combining electroporation and lipofection methods depends on gRNA sequence., 第117回日本繁殖生物学会, Sep. 2024.
Q Lin, Quynh Anh Le, Manita Wittayarat, Zhao Namula, Koki Takebayashi, Maki Hirata, Fuminori Tanihara, Kim Lanh Thi Do and Takeshige Otoi : Triple gene editing in porcine embryos using a combination of microinjection, electroporation, and transfection methods., 第7回ゲノム編集学会, Jun. 2022.
Lin Qingyi, Chommanart Thongkittidilok, Maki Hirata, QUYNH ANH LE, K. Takebayashi, Fuminori Tanihara and Takeshige Otoi : Lipofection-mediated introduction of CRISPR/Cas9 system into porcine zygotes., 第114回日本繁殖生物学会, Sep. 2021.
23.
竹林 滉生, Chommanart Thongkittidilok, 林 青怡, LE ANH QUYNH, 平田 真樹, 谷原 史倫, 音井 威重 : ノックアウトブタ由来精子を用いた体外受精胚におけるゲノム編集効率の検討, 第114回日本繁殖生物学会, 2021年9月.
ブタは生理学的および解剖学的にヒトに近い優れたモデル動物である．これまで遺伝子改変ブタの作製は，遺伝子改変を行った体細胞を用いた核移植によるクローンブタの作製によりなされてきた(体細胞クローン法)．さらに近年Crispr/Cas9システムをはじめとするゲノム編集技術が体細胞の遺伝子改変に活用されている．体細胞クローン法ではbiallelic変異個体を一代で得られるという利点があるが，遺伝子改変細胞株の樹立からクローン胚作製と高度な手技および時間が必要であり，さらに正常産仔の作製効率も未だ低く，実施できる研究者・研究機関は限られている．この問題を解決するため，発表者らはブタ体外受精卵に対しエレクトロポレーションにより CRISPR/Cas9 システムを導入し，簡便かつ高効率に遺伝子改変を行うGEEP法(Genome editing by electroporation of Cas9 protein)を確立した．この手法によりすでに複数のゲノム編集ブタ作製に成功しているが，得られたゲノム編集ブタの解析から，biallelic変異個体の作製に成功しているもののwt配列の残るモザイク個体も存在することがわかり，GEEP法においてモザイク個体率を下げることが課題となっている．今回，ブタ体外受精卵および産仔について，ゲノム編集ブタ作製に使用するガイドRNAとエレクトロポレーションによる導入条件，およびモザイク率の関連を複数の標的遺伝子で解析した．その結果，適切なガイドRNAおよびエレクトロポレーション条件の選択により，biallelic変異個体を一代で得られる可能性が示唆された．
近年，再生医療技術およびゲノム編集技術の進展に伴い，ブタの組織・臓器を用いた異種移植が現実味を帯びてきた．一方，ブタゲノム中にはブタ内在性レトロウイルス(PERV)が多数内在されており，移植後におけるヒトへの感染が懸念されている．ゲノム編集技術により，ブタゲノム中に存在するPERV遺伝子をノックアウトすることにより，PERV感染の制御が可能と考えられるが，内在性レトロウイルスの初期発生との関連性，特に，初期胚発育能に及ぼす影響は未知数である．我々は，これまでにエレクトロポレーションによりCRISPR/Cas9システムをブタの1細胞期体外受精卵に導入することで，ゲノム編集を高効率に行い，かつ胚の生存性を維持できるGEEP法(genome editing by electroporation of Cas9 protein)を確立した．本研究ではブタの体外受精卵において，細胞内でPERV 自身を複製する際に重要なpol 遺伝子を標的にGEEP法によりノックアウトし，ゲノム編集効率と胚発育の関連性を調査した．pol遺伝子を標的とするguideRNA(gRNA)を5種類作製し，それぞれのgRNAをCas9タンパク質とともにブタの体外受精卵に導入した．その結果，一部のgRNA導入群において胚盤胞形成率が非常に低い値を示した．これらの群において4-8細胞期のゲノム編集効率を検討したところ，編集効率は他の群よりも高い値を示し，ゲノム編集効率と胚盤胞形成率に負の関連性が認められた．このことから，PERV遺伝子は胚発生と関連していることが示唆された．
谷原 史倫, 平田 真樹, NGUYEN THI NHIEN, LE ANH QUYNH, 平野 隆之, 音井 威重 : CRISPR/Cas9システムによるブタ体外受精卵のINS遺伝子への点変異導入, 第7回日本先進医工学ブタ研究会, 2019年10月.
5.
音井 威重, 平田 真樹, NGUYEN THI NHIEN, LE ANH QUYNH, 平野 隆之, 谷原 史倫 : GEEP法を用いた遺伝子改変ブタの作製と遺伝子改変効率, 第7回日本先進医工学ブタ研究会, 2019年10月.
6.
平田 真樹, 谷原 史倫, NGUYEN THI NHIEN, LE ANH QUYNH, 平野 隆之, 音井 威重 : ブタ体外受精卵におけるCRISPR/Cas9システムを用いた複数遺伝子の同時改変, 第7回日本先進医工学ブタ研究会, 2019年10月.
7.
Le Anh Quynh, Fuminori Tanihara, Maki Hirata, Nguyen Thi Nhien, Takayuki Hirano and Takeshige Otoi : Concentration of CRISPR/Cas9 components effects on genetic mosaicism of cytoplasmic microinjected porcine embryos, 第6回日本先進医工学ブタ研究会, Oct. 2018.
(要約)
Cytoplasmic microinjection (CI) of the CRISPR/Cas9 system enabled the induction of site-specific mutations in porcine zygotes and resulting pigs, but mosaicism is a serious problem for genetically modified pigs because of the complicated analysis of phenotypes. In the present study, we examined the suitable timing and concentration of CRISPR/Cas9 for introduction into oocytes/zygotes by CI to reduce mosaicism in the resulting blastocysts. In the first experiment, we introduced 20 ng/μl of Cas9 protein and gRNA, targeting the α-1,3-galactosyltransferase (GalT) gene in oocytes before in vitro fertilization (IVF), in zygotes after IVF, or in oocytes and zygotes before and after IVF twice. CI treatment had no detrimental effects on the blastocyst formation rates, but the number of mutant blastocysts from zygotes injected after IVF tended to increase compared to that from oocytes injected before IVF (p < 0.1). In the second experiment, we injected 20 ng/μl or 100 ng/μl of Cas9 protein and gRNA into zygotes after IVF. Although no blastocysts that were injected with 20 ng/μl of Cas9 protein and gRNA carried a biallelic mutation, 50% of blastocysts that were injected with 100 ng/μl of Cas9 protein and gRNA carried a biallelic mutation. In conclusion, to achieve efficient gene editing in porcine zygotes by CI of Cas9 protein with gRNA, performing CI after IVF is better than performing CI before IVF. Furthermore, increasing the concentration of Cas9 protein and gRNA is effective in generating biallelic mutant blastocysts. To reduce mosaicism, however, further optimization of the timing of CI and the concentration of CRISPR/Cas9 components is needed.
8.
Nguyen Thi Nhien, Fuminori Tanihara, Maki Hirata, Takayuki Hirano, Le Anh Quynh, 新居 雅宏 and Takeshige Otoi : Hypothermic storage of porcine zygotes in serum supplemented with chlorogenic acid, 第6回日本先進医工学ブタ研究会, Oct. 2018.
(要約)
The current study was conducted to investigate the effects of 100% fetal bovine serum (FBS) and 100% porcine follicular fluid (pFF) as a storage medium on the developmental competence of porcine zygotes stored at 25°C for 24 h. Moreover, we evaluated the additive effects of chlorogenic acid (CGA) in the storage medium. When in vitro-produced zygotes were stored at 25°C for 24 h in tubes containing either tissue culture medium (TCM) 199 supplemented with 1 mg/mL bovine serum albumin (BSA), 100% of FBS or 100% of pFF, the rate of blastocyst formation was significantly higher in 100% of FBS than in BSA-containing TCM 199. When the effects of CGA supplementation in 100% of FBS on the development of zygotes stored at 25°C for 24 h was evaluated, more zygotes stored with 50 µM CGA developed to blastocysts compared with the other concentrations of CGA. When the formation date and quality of blastocysts derived from zygotes stored in 100% of FBS supplemented with 50 µM CGA were investigated, the highest ratio of blastocysts formation in the storage group appeared 1 day later than in the non-stored control group. However, a higher proportion of blastocysts with apoptotic nuclei was observed in the stored group as compared to the non-stored group. In conclusion, 100% of FBS is available for a short storage medium of porcine zygotes. The supplementation of 50 µM CGA into the storage medium improves the rates of blastocyst formation of zygotes after storage, but the quality of embryos from the stored zygotes remains to be improved.
9.
平田 真樹, 谷原 史倫, 平野 隆之, NGUYEN NHIEN THI, LE ANH QUYNH, 新居 雅宏, 音井 威重 : ブタにおける受精前後でのゲノム編集が胚盤胞の変異導入効率に及ぼす影響, 第6回日本先進医工学ブタ研究会, 2018年10月.
Fuminori Tanihara, Tatsuya Takemoto, Maki Hirata, N Nguyen Thi, Toshiki Kunihara, R Nishinakamura and Takeshige Otoi : Modification of SALL1 gene via CRISPR/Cas9-mediated gene editing introduced into porcine zygotes by electroporation, KEY Forum: The 3rd International symposium on Stem Cell Traits and Developmental Systems, Jan. 2018.