1
|
Moon J, Kim SJ, Lee J, Kang H, Cho B, Kim SJ. Reproductive ability of minipigs as surrogates for somatic cell nuclear transfer. JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2024; 66:156-166. [PMID: 38618033 PMCID: PMC11007462 DOI: 10.5187/jast.2023.e35] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/23/2023] [Accepted: 04/05/2023] [Indexed: 04/16/2024]
Abstract
Pigs are genetically, anatomically, and physiologically similar to humans. Recently, pigs are in the spotlight as a suitable source animal for xenotransplantation. However, to use pigs as source animals, pigs should be raised in designated pathogen-free facilities. There is abundant data from embryo transfer (ET) experiments using farm pigs as surrogates, but data on ET experiments using minipigs are scarce. Eighty minipigs were used for ET experiments and after transplantation, the implantation and delivery rates were investigated. It was also confirmed whether the pregnancy rate could be increased by changing the condition or surgical method of the surrogate. In the case of minipigs that gave birth, the size of the fetal sac on the 28th day of ET was also measured. The factors that can affect the pregnancy rate such as estrus synchronization program, ovulation status at the time of ET, the number of repeated ET surgeries, and the ET sites, were changed, and the differences on the pregnancy rate were observed. However there were no significant differences in pregnancy rate in minipigs. The diameter of the implanted fetal sac on the 28th day after ET in the minipigs whose delivery was confirmed was calculated to be 4.7 ± 0.5 cm. In conclusion, there were no significant differences in pregnancy rate of minipigs in the comparative experiment on various factors affecting the pregnancy rate. However, additional experiments and analyses are needed due to the large individual differences of the minipigs.
Collapse
Affiliation(s)
| | - Su-Jin Kim
- GenNBio Co., Ltd.,
Pyeongtaek 17796, Korea
| | | | | | - Bumrae Cho
- GenNBio Co., Ltd.,
Pyeongtaek 17796, Korea
| | | |
Collapse
|
2
|
Yum SY, Choi W, Kim S, Jang G, Koo O. Identification AAVS1-like locus from the porcine genome and site-specific integration of recombinase-mediated cassette exchange using CRISPR/Cas9. Anim Biotechnol 2023; 34:4730-4735. [PMID: 36905152 DOI: 10.1080/10495398.2023.2187408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Gene integration at site-specific loci is a critical approach for understanding the function of a gene in cells or animals. The AAVS1 locus is a well-known safe harbor for human and mouse studies. In this study, we found an AAVS1-like sequence (pAAVS1) in the porcine genome using the Genome Browser and designed TALEN and CRISPR/Cas9 to target the pAAVS1. The efficiency of CRISPR/Cas9 in porcine cells was superior to that of TALEN. We added a loxP-lox2272 sequences to the pAAVS1 targeting donor vector containing GFP for further exchange of various transgenes via recombinase-mediated cassette exchange (RMCE). The donor vector and CRISPR/Cas9 components were transfected into porcine fibroblasts. Targeted cells of CRISPR/Cas9-mediated homologous recombination were identified by antibiotic selection. Gene knock-in was confirmed by PCR. To induce RMCE, another donor vector containing the loxP-lox2272 and inducible Cre recombinase was cloned. The Cre-donor vector was transfected into the pAAVS1 targeted cell line, and RMCE was induced by adding doxycycline to the culture medium. RMCE in porcine fibroblasts was confirmed using PCR. In conclusion, gene targeting at the pAAVS1 and RMCE in porcine fibroblasts was successful. This technology will be useful for future porcine transgenesis studies and the generation of stable transgenic pigs.
Collapse
Affiliation(s)
- Soo-Young Yum
- Laboratory of Theriogenology and Biotechnology, Department of Veterinary Clinical Science, College of Veterinary Medicine and the Research Institute of Veterinary Science, Seoul National University, Seoul, Republic of Korea
- LARTBio Incorp, Seoul, Republic of Korea
| | - Woojae Choi
- Laboratory of Theriogenology and Biotechnology, Department of Veterinary Clinical Science, College of Veterinary Medicine and the Research Institute of Veterinary Science, Seoul National University, Seoul, Republic of Korea
| | | | - Goo Jang
- Laboratory of Theriogenology and Biotechnology, Department of Veterinary Clinical Science, College of Veterinary Medicine and the Research Institute of Veterinary Science, Seoul National University, Seoul, Republic of Korea
- LARTBio Incorp, Seoul, Republic of Korea
- BK21 Plus program, College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
- Institute of Green Bio Science Technology, Seoul National University, Pyeongchang-gun, Republic of Korea
- Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Okjae Koo
- ToolGen, Inc, Seoul, South Korea
- nSAGE Inc., Incheon, South Korea
- SeaWith Inc., Daegu, South Korea
| |
Collapse
|
3
|
Yum SY, Jang G, Koo O. Target-AID-Mediated Multiplex Base Editing in Porcine Fibroblasts. Animals (Basel) 2021; 11:ani11123570. [PMID: 34944345 PMCID: PMC8697861 DOI: 10.3390/ani11123570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/09/2021] [Accepted: 12/11/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary CRISPR/Cas9 driven multiplex genome editing may induce genotoxicity and chromosomal rearrangements due to DNA double-strand breaks at multiple loci simultaneously. To overcome this problem in porcine cells we utilized Target-AID, a base editing system, to edit multiple loci in the porcine genome. We showed that the Target-AID system works well in porcine fibroblasts with up to 63.15% efficiency. This is the first report demonstrating that the Target-AID system works well in porcine cells and can be used to generate genome-edited pigs. Abstract Multiplex genome editing may induce genotoxicity and chromosomal rearrangements due to double-strand DNA breaks at multiple loci simultaneously induced by programmable nucleases, including CRISPR/Cas9. However, recently developed base-editing systems can directly substitute target sequences without double-strand breaks. Thus, the base-editing system is expected to be a safer method for multiplex genome-editing platforms for livestock. Target-AID is a base editing system composed of PmCDA1, a cytidine deaminase from sea lampreys, fused to Cas9 nickase. It can be used to substitute cytosine for thymine in 3–5 base editing windows 18 bases upstream of the protospacer-adjacent motif site. In the current study, we demonstrated Target-AID-mediated base editing in porcine cells for the first time. We targeted multiple loci in the porcine genome using the Target-AID system and successfully induced target-specific base substitutions with up to 63.15% efficiency. This system can be used for the further production of various genome-engineered pigs.
Collapse
Affiliation(s)
- Soo-Young Yum
- Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea; (S.-Y.Y.); (G.J.)
- ToolGen, Inc., Seoul 08501, Korea
| | - Goo Jang
- Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea; (S.-Y.Y.); (G.J.)
| | - Okjae Koo
- ToolGen, Inc., Seoul 08501, Korea
- Correspondence:
| |
Collapse
|
4
|
Cheng W, Zhao H, Yu H, Xin J, Wang J, Zeng L, Yuan Z, Qing Y, Li H, Jia B, Yang C, Shen Y, Zhao L, Pan W, Zhao HY, Wang W, Wei HJ. Efficient generation of GGTA1-null Diannan miniature pigs using TALENs combined with somatic cell nuclear transfer. Reprod Biol Endocrinol 2016; 14:77. [PMID: 27821126 PMCID: PMC5100250 DOI: 10.1186/s12958-016-0212-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 10/26/2016] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND α1,3-Galactosyltransferase (GGTA1) is essential for the biosynthesis of glycoproteins and therefore a simple and effective target for disrupting the expression of galactose α-1,3-galactose epitopes, which mediate hyperacute rejection (HAR) in xenotransplantation. Miniature pigs are considered to have the greatest potential as xenotransplantation donors. A GGTA1-knockout (GTKO) miniature pig might mitigate or prevent HAR in xenotransplantation. METHODS Transcription activator-like effector nucleases (TALENs) were designed to target exon 6 of porcine GGTA1 gene. The targeting activity was evaluated using a luciferase SSA recombination assay. Biallelic GTKO cell lines were established from single-cell colonies of fetal fibroblasts derived from Diannan miniature pigs following transfection by electroporation with TALEN plasmids. One cell line was selected as donor cell line for somatic cell nuclear transfer (SCNT) for the generation of GTKO pigs. GTKO aborted fetuses, stillborn fetuses and live piglets were obtained. Genotyping of the collected cloned individuals was performed. The Gal expression in the fibroblasts and one piglet was analyzed by fluorescence activated cell sorting (FACS), confocal microscopy, immunohistochemical (IHC) staining and western blotting. RESULTS The luciferase SSA recombination assay revealed that the targeting activities of the designed TALENs were 17.1-fold higher than those of the control. Three cell lines (3/126) showed GGTA1 biallelic knockout after modification by the TALENs. The GGTA1 biallelic modified C99# cell line enabled high-quality SCNT, as evidenced by the 22.3 % (458/2068) blastocyst developmental rate of the reconstructed embryos. The reconstructed GTKO embryos were subsequently transferred into 18 recipient gilts, of which 12 became pregnant, and six miscarried. Eight aborted fetuses were collected from the gilts that miscarried. One live fetus was obtained from one surrogate by caesarean after 33 d of gestation for genotyping. In total, 12 live and two stillborn piglets were collected from six surrogates by either caesarean or natural birth. Sequencing analyses of the target site confirmed the homozygous GGTA1-null mutation in all fetuses and piglets, consistent with the genotype of the donor cells. Furthermore, FACS, confocal microscopy, IHC and western blotting analyses demonstrated that Gal epitopes were completely absent from the fibroblasts, kidneys and pancreas of one GTKO piglet. CONCLUSIONS TALENs combined with SCNT were successfully used to generate GTKO Diannan miniature piglets.
Collapse
Affiliation(s)
- Wenmin Cheng
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
| | - Heng Zhao
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
| | - Honghao Yu
- Research Center of Life Science, Yulin University, Yulin, 719000 China
| | - Jige Xin
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
| | - Jia Wang
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
- Hunan Xeno Life Science Co., Ltd, Changsha, 410600 China
| | - Luyao Zeng
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
| | - Zaimei Yuan
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
| | - Yubo Qing
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
| | - Honghui Li
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
| | - Baoyu Jia
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
| | - Cejun Yang
- Institute for Cell Transplantation and Gene Therapy, The Third Xiangya Hospital Central-South University, Changsha, 410013 China
| | - Youfeng Shen
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
| | - Lu Zhao
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
| | - Weirong Pan
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
| | - Hong-Ye Zhao
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
| | - Wei Wang
- Hunan Xeno Life Science Co., Ltd, Changsha, 410600 China
- Institute for Cell Transplantation and Gene Therapy, The Third Xiangya Hospital Central-South University, Changsha, 410013 China
| | - Hong-Jiang Wei
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201 China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201 China
- Key Laboratory of Animal Nutrition and Feed of Yunnan Province, Yunnan Agricultural University, Kunming, 650201 China
| |
Collapse
|