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Dehdilani N, Goshayeshi L, Yousefi Taemeh S, Bahrami AR, Rival Gervier S, Pain B, Dehghani H. Integrating Omics and CRISPR Technology for Identification and Verification of Genomic Safe Harbor Loci in the Chicken Genome. Biol Proced Online 2023; 25:18. [PMID: 37355580 DOI: 10.1186/s12575-023-00210-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 06/02/2023] [Indexed: 06/26/2023] Open
Abstract
BACKGROUND One of the most prominent questions in the field of transgenesis is 'Where in the genome to integrate a transgene?'. Escape from epigenetic silencing and promoter shutdown of the transgene needs reliable genomic safe harbor (GSH) loci. Advances in genome engineering technologies combined with multi-omics bioinformatics data have enabled rational evaluation of GSH loci in the host genome. Currently, no validated GSH loci have been evaluated in the chicken genome. RESULTS Here, we analyzed and experimentally examined two GSH loci in the genome of chicken cells. To this end, putative GSH loci including chicken HIPP-like (cHIPP; between DRG1 and EIF4ENIF1 genes) and chicken ROSA-like (cROSA; upstream of the THUMPD3 gene) were predicted using multi-omics bioinformatics data. Then, the durable expression of the transgene was validated by experimental characterization of continuously-cultured isogenous cell clones harboring DsRed2-ΔCMV-EGFP cassette in the predicted loci. The weakened form of the CMV promoter (ΔCMV) allowed the precise evaluation of GSH loci in a locus-dependent manner compared to the full-length CMV promoter. CONCLUSIONS cHIPP and cROSA loci introduced in this study can be reliably exploited for consistent bio-manufacturing of recombinant proteins in the genetically-engineered chickens. Also, results showed that the genomic context dictates the expression of transgene controlled by ΔCMV in GSH loci.
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Affiliation(s)
- Nima Dehdilani
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran
| | - Lena Goshayeshi
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran
- Division of Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Sara Yousefi Taemeh
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran
- Division of Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Ahmad Reza Bahrami
- Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
- Industrial Biotechnology Research Group, Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Sylvie Rival Gervier
- Stem Cell and Brain Research Institute, University of Lyon, Université Lyon 1, INSERM, INRAE, U1208, USC1361, 69500, Bron, France
| | - Bertrand Pain
- Stem Cell and Brain Research Institute, University of Lyon, Université Lyon 1, INSERM, INRAE, U1208, USC1361, 69500, Bron, France
| | - Hesam Dehghani
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran.
- Division of Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
- Department of Basic Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
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Xie Y, Wang M, Gu L, Wang Y. CRISPR/Cas9-mediated knock-in strategy at the Rosa26 locus in cattle fetal fibroblasts. PLoS One 2022; 17:e0276811. [PMID: 36441701 PMCID: PMC9704577 DOI: 10.1371/journal.pone.0276811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Accepted: 10/14/2022] [Indexed: 11/29/2022] Open
Abstract
The genetic modification of cattle has many agricultural and biomedical applications. However, random integration often leads to the unstable or differentially expression of the exogenous genes, which limit the application and development of transgenic technologies. Finding a safe locus suitable for site-specific insertion and efficient expression of exogenous genes is a good way to overcome these hurdles. In this study, we efficiently integrated three targeted vector into the cattle Rosa26 (cRosa26) by CRISPR/Cas9 technology in which EGFP was driven by CAG, EF1a, PGK and cRosa26 endogenous promoter respectively. The CRISPR/Cas9 knock-in system allows highly efficient gene insertion of different expression units at the cRosa26 locus. We also find that in the four cell lines, EGFP was stable expressed at different times, and the CAG promoter has the highest activity to activate the expression of EGFP, when compared with the cRosa26, EF1a and PGK promoter. Our results proved that cRosa26 was a locus that could integrate different expression units efficiently, and supported the friendly expression of different expression units. Our findings described here will be useful for a variety of studies using cattle.
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Affiliation(s)
- Yuxuan Xie
- Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin jianzhu University, Changchun, Jilin Province, People’s Republic of China
| | - Ming Wang
- College of Animal Science and Technology, China Agricultural University, Beijing, People’s Republic of China
| | - Liang Gu
- Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin jianzhu University, Changchun, Jilin Province, People’s Republic of China
| | - Yang Wang
- Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin jianzhu University, Changchun, Jilin Province, People’s Republic of China
- * E-mail:
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3
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Ko N, Shim J, Kim HJ, Lee Y, Park JK, Kwak K, Lee JW, Jin DI, Kim H, Choi K. A desirable transgenic strategy using GGTA1 endogenous promoter-mediated knock-in for xenotransplantation model. Sci Rep 2022; 12:9611. [PMID: 35688851 PMCID: PMC9187654 DOI: 10.1038/s41598-022-13536-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 05/25/2022] [Indexed: 11/09/2022] Open
Abstract
Pig-to-human organ transplantation is a feasible solution to resolve the shortage of organ donors for patients that wait for transplantation. To overcome immunological rejection, which is the main hurdle in pig-to-human xenotransplantation, various engineered transgenic pigs have been developed. Ablation of xeno-reactive antigens, especially the 1,3-Gal epitope (GalT), which causes hyperacute rejection, and insertion of complement regulatory protein genes, such as hCD46, hCD55, and hCD59, and genes to regulate the coagulation pathway or immune cell-mediated rejection may be required for an ideal xenotransplantation model. However, the technique for stable and efficient expression of multi-transgenes has not yet been settled to develop a suitable xenotransplantation model. To develop a stable and efficient transgenic system, we knocked-in internal ribosome entry sites (IRES)-mediated transgenes into the α 1,3-galactosyltransferase (GGTA1) locus so that expression of these transgenes would be controlled by the GGTA1 endogenous promoter. We constructed an IRES-based polycistronic hCD55/hCD39 knock-in vector to target exon4 of the GGTA1 gene. The hCD55/hCD39 knock-in vector and CRISPR/Cas9 to target exon4 of the GGTA1 gene were co-transfected into white yucatan miniature pig fibroblasts. After transfection, hCD39 expressed cells were sorted by FACS. Targeted colonies were verified using targeting PCR and FACS analysis, and used as donors for somatic cell nuclear transfer. Expression of GalT, hCD55, and hCD39 was analyzed by FACS and western blotting. Human complement-mediated cytotoxicity and human antibody binding assays were conducted on peripheral blood mononuclear cells (PBMCs) and red blood cells (RBCs), and deposition of C3 by incubation with human complement serum and platelet aggregation were analyzed in GGTA1 knock-out (GTKO)/CD55/CD39 pig cells. We obtained six targeted colonies with high efficiency of targeting (42.8% of efficiency). Selected colony and transgenic pigs showed abundant expression of targeted genes (hCD55 and hCD39). Knocked-in transgenes were expressed in various cell types under the control of the GGTA1 endogenous promoter in GTKO/CD55/CD39 pig and IRES was sufficient to express downstream expression of the transgene. Human IgG and IgM binding decreased in GTKO/CD55/CD39 pig and GTKO compared to wild-type pig PBMCs and RBCs. The human complement-mediated cytotoxicity of RBCs and PBMCs decreased in GTKO/CD55/CD39 pig compared to cells from GTKO pig. C3 was also deposited less in GTKO/CD55/CD39 pig cells than wild-type pig cells. The platelet aggregation was delayed by hCD39 expression in GTKO/CD55/CD39 pig. In the current study, knock-in into the GGTA1 locus and GGTA1 endogenous promoter-mediated expression of transgenes are an appropriable strategy for effective and stable expression of multi-transgenes. The IRES-based polycistronic transgene vector system also caused sufficient expression of both hCD55 and hCD39. Furthermore, co-transfection of CRISPR/Cas9 and the knock-in vector not only increased the knock-in efficiency but also induced null for GalT by CRISPR/Cas9-mediated double-stranded break of the target site. As shown in human complement-mediated lysis and human antibody binding to GTKO/CD55/CD39 transgenic pig cells, expression of hCD55 and hCD39 with ablation of GalT prevents an effective immunological reaction in vitro. As a consequence, our technique to produce multi-transgenic pigs could improve the development of a suitable xenotransplantation model, and the GTKO/CD55/CD39 pig developed could prolong the survival of pig-to-primate xenotransplant recipients.
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Affiliation(s)
- Nayoung Ko
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea
- Department of Animal Science and Biotechnology, Chungnam National University, Daejeon, Republic of Korea
| | - Joohyun Shim
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea
- Department of Animal Science and Biotechnology, Chungnam National University, Daejeon, Republic of Korea
| | - Hyoung-Joo Kim
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea
| | - Yongjin Lee
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea
| | - Jae-Kyung Park
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea
| | - Kyungmin Kwak
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea
| | - Jeong-Woong Lee
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience and Biotechnology, Dajeon, Republic of Korea
| | - Dong-Il Jin
- Department of Animal Science and Biotechnology, Chungnam National University, Daejeon, Republic of Korea
| | - Hyunil Kim
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea
| | - Kimyung Choi
- Department of Transgenic Animal Research, Optipharm, Inc., Chungcheongbuk-do, Cheongju-si, 28158, Republic of Korea.
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Vats P, Kaushik R, Rawat N, Sharma A, Sharma T, Dua D, Singh MK, Palta P, Singla SK, Manik RS, Chauhan MS. Production of Transgenic Handmade Cloned Goat ( Capra hircus) Embryos by Targeted Integration into Rosa 26 Locus Using Transcription Activator-like Effector Nucleases. Cell Reprogram 2021; 23:250-262. [PMID: 34348041 DOI: 10.1089/cell.2021.0011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Transgenic goats are ideal bioreactors for the production of therapeutic proteins in their mammary glands. However, random integration of the transgene within-host genome often culminates in unstable expression and unpredictable phenotypes. Targeting desired genes to a safe locus in the goat genome using advanced targeted genome-editing tools, such as transcription activator-like effector nucleases (TALENs) might assist in overcoming these hurdles. We identified Rosa 26 locus, a safe harbor for transgene integration, on chromosome 22 in the goat genome for the first time. We further demonstrate that TALEN-mediated targeting of GFP gene cassette at Rosa 26 locus exhibited stable and ubiquitous expression of GFP gene in goat fetal fibroblasts (GFFs) and after that, transgenic cloned embryos generated by handmade cloning (HMC). The transfection of GFFs by the TALEN pair resulted in 13.30% indel frequency at the target site. Upon cotransfection with TALEN and donor vectors, four correctly targeted cell colonies were obtained and all of them showed monoallelic gene insertions. The blastocyst rate for transgenic cloned embryos (3.92% ± 1.12%) was significantly (p < 0.05) lower than cloned embryos (7.84% ± 0.68%) used as control. Concomitantly, 2 out of 15 embryos of morulae and blastocyst stage (13.30%) exhibited site-specific integration. In conclusion, the present study demonstrates TALEN-mediated transgene integration at Rosa 26 locus in caprine fetal fibroblasts and the generation of transgenic cloned embryos using HMC.
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Affiliation(s)
- Preeti Vats
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Ramakant Kaushik
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Nidhi Rawat
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Ankur Sharma
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Tushar Sharma
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Diksha Dua
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Manoj Kumar Singh
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Prabhat Palta
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Suresh Kumar Singla
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Radhey Sham Manik
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Manmohan Singh Chauhan
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
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5
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Shahabipour F, Oskuee RK, Shokrgozar MA, Naderi-Meshkin H, Goshayeshi L, Bonakdar S. CRISPR/Cas9 mediated GFP-human dentin matrix protein 1 (DMP1) promoter knock-in at the ROSA26 locus in mesenchymal stem cell for monitoring osteoblast differentiation. J Gene Med 2020; 22:e3288. [PMID: 33047833 DOI: 10.1002/jgm.3288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 08/27/2020] [Accepted: 08/30/2020] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Dentin matrix protein 1 (DMP1) is highly expressed in mineralized tooth and bone, playing a critical role in mineralization and phosphate metabolism. One important role for the expression of DMP1 in the nucleus of preosteoblasts is the up-regulation of osteoblast-specific genes such as osteocalcin and alkaline phosphatase1 . The present study aimed to investigate the potential application of human DMP1 promoter as an indicator marker of osteoblastic differentiation. METHODS In the present study, we developed DMP1 promoter-DsRed-GFP knock-in mesenchymal stem cell (MSCs) via the clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9) system that enabled automatic detection of osteoblast differentiation. With the application of a homology-directed knock-in strategy, a 2-kb fragment of DMP1 promoter, which was inserted upstream of the GFP and DsRed reporter cassette, was integrated into the human ROSA locus to generate double fluorescent cells. We further differentiated MSCs under osteogenic media to monitor the fate of MSCs. First, cells were transfected using CRISPR/Cas9 plasmids, which culminated in MSCs with a green fluorescence intensity, then GFP-positive cells were selected using puromycin. Second, the GFP-positive MSCs were differentiated toward osteoblasts, which demonstrated an increased red fluorescence intensity. The osteoblast differentiation of MSCs was also verified by performing alkaline phosphatase and Alizarin Red assays. RESULTS We have exploited the DMP1 promoter as a predictive marker of MSC differentiation toward osteoblasts. Using the CRISPR/Cas9 technology, we have identified a distinctive change in the fluorescence intensities of GFP knock-in (green) and osteoblast differentiated MSCs 2 . CONCLUSIONS The data show that DMP1-DsRed-GFP knock-in MSCs through CRISPR/Cas9 technology provide a valuable indicator for osteoblast differentiation. Moreover, The DMP1 promoter might be used as a predictive marker of MSCs differentiated toward osteoblasts.
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Affiliation(s)
| | - Reza Kazemi Oskuee
- Targeted Drug Delivery Research Center, Institute of Pharmaceutical Technology, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Hojjat Naderi-Meshkin
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran.,Welcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, UK
| | - Lena Goshayeshi
- Division of Biotechnology, Faculty of veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Shahin Bonakdar
- National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, Iran
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Eun K, Hong N, Jeong YW, Park MG, Hwang SU, Jeong YIK, Choi EJ, Olsson PO, Hwang WS, Hyun SH, Kim H. Transcriptional activities of human elongation factor-1α and cytomegalovirus promoter in transgenic dogs generated by somatic cell nuclear transfer. PLoS One 2020; 15:e0233784. [PMID: 32492024 PMCID: PMC7269240 DOI: 10.1371/journal.pone.0233784] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 05/12/2020] [Indexed: 11/30/2022] Open
Abstract
Recent advances in somatic cell nuclear transfer (SCNT) in canines facilitate the production of canine transgenic models. Owing to the importance of stable and strong promoter activity in transgenic animals, we tested human elongation factor 1α (hEF1α) and cytomegalovirus (CMV) promoter sequences in SCNT transgenic dogs. After transfection, transgenic donor fibroblasts with the hEF1α-enhanced green fluorescence protein (EGFP) transgene were successfully isolated using fluorescence-activated cell sorting (FACS). We obtained four puppies, after SCNT, and identified three puppies as being transgenic using PCR analysis. Unexpectedly, EGFP regulated by hEF1α promoter was not observed at the organismal and cellular levels in these transgenic dogs. EGFP expression was rescued by the inhibition of DNA methyltransferases, implying that the hEF1α promoter is silenced by DNA methylation. Next, donor cells with CMV-EGFP transgene were successfully established and SCNT was performed. Three puppies of six born puppies were confirmed to be transgenic. Unlike hEF1α-regulated EGFP, CMV-regulated EGFP was strongly detectable at both the organismal and cellular levels in all transgenic dogs, even after 19 months. In conclusion, our study suggests that the CMV promoter is more suitable, than the hEF1α promoter, for stable transgene expression in SCNT-derived transgenic canine model.
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Affiliation(s)
- Kiyoung Eun
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
- Institute of Animal Molecular Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
| | - Nayoung Hong
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
- Institute of Animal Molecular Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
| | - Yeon Woo Jeong
- Sooam Biotech Research Foundation, Guro-gu, Seoul, Republic of Korea
| | - Min Gi Park
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
- Institute of Animal Molecular Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
| | - Seon-Ung Hwang
- Laboratory of Veterinary Embryology and Biotechnology, College of Veterinary Medicine, Chungbuk National University, Seowon-gu, Cheongju, Republic of Korea
- Institute of Stem Cell & Regenerative Medicine, Chungbuk National University, Seowon-gu, Cheongju, Republic of Korea
| | - Yeon I. K. Jeong
- Sooam Biotech Research Foundation, Guro-gu, Seoul, Republic of Korea
| | - Eun Ji Choi
- Sooam Biotech Research Foundation, Guro-gu, Seoul, Republic of Korea
| | - P. Olof Olsson
- Sooam Biotech Research Foundation, Guro-gu, Seoul, Republic of Korea
| | - Woo Suk Hwang
- Sooam Biotech Research Foundation, Guro-gu, Seoul, Republic of Korea
| | - Sang-Hwan Hyun
- Laboratory of Veterinary Embryology and Biotechnology, College of Veterinary Medicine, Chungbuk National University, Seowon-gu, Cheongju, Republic of Korea
- Institute of Stem Cell & Regenerative Medicine, Chungbuk National University, Seowon-gu, Cheongju, Republic of Korea
- * E-mail: (SHH); (HK)
| | - Hyunggee Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
- Institute of Animal Molecular Biotechnology, Korea University, Seongbuk-gu, Seoul, Republic of Korea
- * E-mail: (SHH); (HK)
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Xie Z, Jiao H, Xiao H, Jiang Y, Liu Z, Qi C, Zhao D, Jiao S, Yu T, Tang X, Pang D, Ouyang H. Generation of pRSAD2 gene knock-in pig via CRISPR/Cas9 technology. Antiviral Res 2019; 174:104696. [PMID: 31862502 DOI: 10.1016/j.antiviral.2019.104696] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 12/10/2019] [Accepted: 12/12/2019] [Indexed: 10/25/2022]
Abstract
A wide range of endemic and epidemic viruses, including classic swine fever virus (CSFV), pseudorabies virus (PRV) and others, are among the most economically important pathogens in pigs and have severely affected the national economy, human health and animal welfare and productivity. The RSAD2 exhibits antiviral activity against various DNA and RNA viruses. In this study, we successfully accomplished site-specific insertion of the porcine RSAD2 gene (pRSAD2) at the porcine ROSA26 (pROSA26) locus, generating pRSAD2 gene knock-in (pRSAD2-KI) PK-15 cells and porcine foetal fibroblasts (PFFs) via CRISPR/Cas9 technology. Gene expression analysis confirmed that pRSAD2-KI cells stably and efficiently overexpressed the pRSAD2 gene. Furthermore, viral challenge studies in vitro indicated that site-specific integration of the pRSAD2 gene not only effectively reduced CSFV infection but also PRV infection. More importantly, we ultimately successfully produced a pRSAD2-KI pig that constitutively overexpressed the pRSAD2, viral challenge results indicated that fibroblasts isolated from the pRSAD2-KI pig reduced CSFV infection. Taken together, these results suggest that CRISPR/Cas9-mediated knock-in strategy can be used for producing pRSAD2-KI pigs.
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Affiliation(s)
- Zicong Xie
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Huping Jiao
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Haonan Xiao
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Yuan Jiang
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Zhenying Liu
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Chunyun Qi
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Dehua Zhao
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Shuyu Jiao
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Tingting Yu
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Xiaochun Tang
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Daxin Pang
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China
| | - Hongsheng Ouyang
- Key Laboratory of Zoonosis Research, Ministry of Education, Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, 130062, Changchun, Jilin Province, People's Republic of China.
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Browning J, Rooney M, Hams E, Takahashi S, Mizuno S, Sugiyama F, Fallon PG, Kelly VP. Highly efficient CRISPR-targeting of the murine Hipp11 intergenic region supports inducible human transgene expression. Mol Biol Rep 2019; 47:1491-1498. [PMID: 31811500 DOI: 10.1007/s11033-019-05204-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 11/21/2019] [Indexed: 01/21/2023]
Abstract
Safe harbor loci allow predicable integration of a transgene into the genome without perturbing endogenous gene activity and for decades have been exploited in the mouse to investigate gene function, generate humanised models and create tissue specific reporter and Cre recombinase expressing lines. Herein, we show that the murine Hipp11 intergenic region can facilitate highly efficient integration of a large transgene-the human CD1A promoter and coding region-by means of CRISPR-Cas9 mediated homology directed repair. The data shows that the single copy human CD1A transgene is faithfully expressed in an inducible manner in homozygous animals in both macrophage and dendritic cells. Our results validate the Hipp11 intergenic region as being a highly amenable target site for functional transgene integration in mouse.
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Affiliation(s)
- Jill Browning
- School of Biochemistry& Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Michael Rooney
- School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Emily Hams
- School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Satoru Takahashi
- 1-1-1 Tennodai Laboratory Animal Resource Center, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Seiya Mizuno
- 1-1-1 Tennodai Laboratory Animal Resource Center, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Fumihiro Sugiyama
- 1-1-1 Tennodai Laboratory Animal Resource Center, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Padraic G Fallon
- School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Vincent P Kelly
- School of Biochemistry& Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.
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9
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Liu F, Liu J, Yuan Z, Qing Y, Li H, Xu K, Zhu W, Zhao H, Jia B, Pan W, Guo J, Zhang X, Cheng W, Wang W, Zhao HY, Wei HJ. Generation of GTKO Diannan Miniature Pig Expressing Human Complementary Regulator Proteins hCD55 and hCD59 via T2A Peptide-Based Bicistronic Vectors and SCNT. Mol Biotechnol 2019; 60:550-562. [PMID: 29916131 DOI: 10.1007/s12033-018-0091-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Pig-to-human organ transplantation has drawn attention in recent years due to the potential use of pigs as an alternative source of human donor organs. While GGTA1 knockout (GTKO) can protect xenografts from hyperacute rejection, complement-dependent cytotoxicity might still contribute to this type of rejection. To prolong the xenograft survival, we utilized a T2A-mediated pCMV-hCD55-T2A-hCD59-Neo vector and transfected the plasmid into GTKO Diannan miniature pig fetal fibroblasts. After G418 selection combined with single-cell cloning culture, four colonies were obtained, and three of these were successfully transfected with the hCD55 and hCD59. One of the three colonies was selected as donor cells for somatic cell nuclear transfer (SCNT). Then, the reconstructed embryos were transferred into eight recipient gilts, resulting in four pregnancies. Three of the pregnant gilts delivered, yielding six piglets. Only one piglet carried hCD55 and hCD59 genetic modification. The expression levels of the GGTA1, hCD55, and hCD59 in the tissues and fibroblasts of the piglet were determined by q-PCR, fluorescence microscopy, immunohistochemical staining, and western blotting analyses. The results showed the absence of GGTA1 and the coexpression of the hCD55 and hCD59. However, the mRNA expression levels of hCD55 and hCD59 in the GTKO/hCD55/hCD59 pig fibroblasts were lower than that in human 293T cells, which may be caused by low copy number and/or CMV promoter methylation. Furthermore, we performed human complement-mediated cytolysis assays using human serum solutions from 0 to 60%. The result showed that the fibroblasts of this triple-gene modified piglet had greater survival rates than that of wild-type and GTKO controls. Taken together, these results indicate that T2A-mediated polycistronic vector system combined with SCNT can effectively generate multiplex genetically modified pigs, additional hCD55 and hCD59 expression on top of a GTKO genetic background markedly enhance the protective effect towards human serum-mediated cytolysis than those of GTKO alone. Thus, we suggest that GTKO/hCD55/hCD59 triple-gene-modified Diannan miniature pig will be a more eligible donor for xenotransplantation.
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Affiliation(s)
- Fengjuan Liu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Jinji Liu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Zaimei Yuan
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Yubo Qing
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Honghui Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Kaixiang Xu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China
| | - Wanyun Zhu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, 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
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, 650201, China
| | - Baoyu Jia
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China
- 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
| | - Jianxiong Guo
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China
| | - Xuezeng Zhang
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming, 650201, China
| | - Wenmin Cheng
- College of Animal Science and Technology, 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-Ye Zhao
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China.
| | - Hong-Jiang Wei
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural University, Kunming, 650201, China.
- College of Veterinary Medicine, Yunnan Agricultural University, Kunming, 650201, China.
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10
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Yu M, Sun X, Tyler SR, Liang B, Swatek AM, Lynch TJ, He N, Yuan F, Feng Z, Rotti PG, Choi SH, Shahin W, Liu X, Yan Z, Engelhardt JF. Highly Efficient Transgenesis in Ferrets Using CRISPR/Cas9-Mediated Homology-Independent Insertion at the ROSA26 Locus. Sci Rep 2019; 9:1971. [PMID: 30760763 PMCID: PMC6374392 DOI: 10.1038/s41598-018-37192-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 12/03/2018] [Indexed: 11/09/2022] Open
Abstract
The domestic ferret (Mustela putorius furo) has proven to be a useful species for modeling human genetic and infectious diseases of the lung and brain. However, biomedical research in ferrets has been hindered by the lack of rapid and cost-effective methods for genome engineering. Here, we utilized CRISPR/Cas9-mediated, homology-independent insertion at the ROSA26 "safe harbor" locus in ferret zygotes and created transgenic animals expressing a dual-fluorescent Cre-reporter system flanked by PhiC31 and Bxb1 integrase attP sites. Out of 151 zygotes injected with circular transgene-containing plasmid and Cas9 protein loaded with the ROSA26 intron-1 sgRNA, there were 23 births of which 5 had targeted integration events (22% efficiency). The encoded tdTomato transgene was highly expressed in all tissues evaluated. Targeted integration was verified by PCR analyses, Southern blot, and germ-line transmission. Function of the ROSA26-CAG-LoxPtdTomatoStopLoxPEGFP (ROSA-TG) Cre-reporter was confirmed in primary cells following Cre expression. The Phi31 and Bxb1 integrase attP sites flanking the transgene will also enable rapid directional insertion of any transgene without a size limitation at the ROSA26 locus. These methods and the model generated will greatly enhance biomedical research involving lineage tracing, the evaluation of stem cell therapy, and transgenesis in ferret models of human disease.
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Affiliation(s)
- Miao Yu
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
- College of Life Science, Ningxia University, Yinchuan, Ningxia, 750021, China
| | - Xingshen Sun
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Scott R Tyler
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Bo Liang
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Anthony M Swatek
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Thomas J Lynch
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Nan He
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Feng Yuan
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Zehua Feng
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Pavana G Rotti
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Soon H Choi
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Weam Shahin
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA
| | - Xiaoming Liu
- College of Life Science, Ningxia University, Yinchuan, Ningxia, 750021, China.
| | - Ziying Yan
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA.
| | - John F Engelhardt
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, 52242, USA.
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11
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Genetically modified pigs are protected from classical swine fever virus. PLoS Pathog 2018; 14:e1007193. [PMID: 30543715 PMCID: PMC6292579 DOI: 10.1371/journal.ppat.1007193] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 10/31/2018] [Indexed: 01/01/2023] Open
Abstract
Classical swine fever (CSF) caused by classical swine fever virus (CSFV) is one of the most detrimental diseases, and leads to significant economic losses in the swine industry. Despite efforts by many government authorities to stamp out the disease from national pig populations, the disease remains widespread. Here, antiviral small hairpin RNAs (shRNAs) were selected and then inserted at the porcine Rosa26 (pRosa26) locus via a CRISPR/Cas9-mediated knock-in strategy. Finally, anti-CSFV transgenic (TG) pigs were produced by somatic nuclear transfer (SCNT). Notably, in vitro and in vivo viral challenge assays further demonstrated that these TG pigs could effectively limit the replication of CSFV and reduce CSFV-associated clinical signs and mortality, and disease resistance could be stably transmitted to the F1-generation. Altogether, our work demonstrated that RNA interference (RNAi) technology combining CRISPR/Cas9 technology offered the possibility to produce TG animal with improved resistance to viral infection. The use of these TG pigs can reduce CSF-related economic losses and this antiviral strategy may be useful for future antiviral research. Classical swine fever (CSF), caused by classical swine fever virus (CSFV), and is a highly contagious, often fatal porcine disease that causes significant economic losses. Due to the economic importance of this virus to the pig industry, the biology and pathogenesis of CSFV have been investigated extensively. Despite efforts by many government authorities to stamp out the disease from national pig populations, the disease remains widespread, and it is only a matter of time before the virus is reintroduced and the next round of disease outbreaks occurs. These findings highlight the necessity and urgency for developing effective approaches to eradicate the challenging CSFV. In this study, we successfully produced anti-CSFV TG pigs by combining RNAi technology and CRISPR/Cas9 technologies, and viral challenge results confirmed that these TG pigs could effectively limit the replication of CSFV in vivo and in vitro. Additionally, we confirmed that the disease resistance traits in the TG founders were stably transmitted to their F1-generation offspring. Altogether, our work reported the combinational application of CRISPR/Cas9 and RNA interference (RNAi) technology in the generation of anti-CSFV TG pigs, it provided an alternative strategy to change the virus. The results of this study suggested that these TG pigs offered potential benefits over commercial vaccination and reduced CSFV-related economic losses.
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12
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Live-Cell FRET Imaging Reveals a Role of Extracellular Signal-Regulated Kinase Activity Dynamics in Thymocyte Motility. iScience 2018; 10:98-113. [PMID: 30508722 PMCID: PMC6277225 DOI: 10.1016/j.isci.2018.11.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 11/01/2018] [Accepted: 11/14/2018] [Indexed: 01/20/2023] Open
Abstract
Extracellular signal-regulated kinase (ERK) plays critical roles in T cell development in the thymus. Nevertheless, the dynamics of ERK activity and the role of ERK in regulating thymocyte motility remain largely unknown due to technical limitations. To visualize ERK activity in thymocytes, we here developed knockin reporter mice expressing a Förster/fluorescence resonance energy transfer (FRET)-based biosensor for ERK from the ROSA26 locus. Live imaging of thymocytes isolated from the reporter mice revealed that ERK regulates thymocyte motility in a subtype-specific manner. Negative correlation between ERK activity and motility was observed in CD4/CD8 double-positive thymocytes and CD8 single-positive thymocytes, but not in CD4 single-positive thymocytes. Interestingly, however, the temporal deviations of ERK activity from the average correlate with the motility of CD4 single-positive thymocytes. Thus, live-cell FRET imaging will open a window to understanding the dynamic nature and the diverse functions of ERK signaling in T cell biology. Mice expressing EKAREV from ROSA26 locus enable ERK activity monitoring in T cells ERK activity negatively regulates the motility of thymocytes in the thymus Temporal dynamics of ERK activity regulates cell motility of CD4-SP in the medulla TCR signal from intercellular association induces ERK activity dynamics in CD4-SP
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13
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CRISPR/Cas and recombinase-based human-to-pig orthotopic gene exchange for xenotransplantation. J Surg Res 2018; 229:28-40. [DOI: 10.1016/j.jss.2018.03.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 02/13/2018] [Accepted: 03/20/2018] [Indexed: 12/12/2022]
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14
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Efficient targeted integration into the bovine Rosa26 locus using TALENs. Sci Rep 2018; 8:10385. [PMID: 29991797 PMCID: PMC6039519 DOI: 10.1038/s41598-018-28502-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 06/04/2018] [Indexed: 02/03/2023] Open
Abstract
The genetic modification of cattle has many agricultural and biomedical applications. However, random integration often results in the unstable expression of transgenes and unpredictable phenotypes. Targeting genes to the "safe locus" and stably expressing foreign genes at a high level are desirable methods for overcoming these hurdles. The Rosa26 locus has been widely used to produce genetically modified animals in some species expressing transgenes at high and consistent levels. For the first time, we identified a bovine orthologue of the mouse Rosa26 locus through a genomic sequence homology analysis. According to 5' rapid-amplification of cDNA ends (5'RACE), 3' rapid-amplification of cDNA ends (3'RACE), reverse transcription PCR (RT-PCR) and quantitative PCR (Q-PCR) experiments, this locus encodes a long noncoding RNA (lncRNA) comprising two exons that is expressed ubiquitously and stably in different tissues. The bovine Rosa26 (bRosa26) locus appears to be highly amenable to transcription activator-like effector nucleases (TALENs)-mediated knock-in, and ubiquitous expression of enhanced green fluorescent protein (EGFP) inserted in the bRosa26 locus was observed in various stages, including cells, embryos, fetus and cattle. Finally, we created a valuable master bRosa26-EGFP fetal fibroblast cell line in which any gene of interest can be efficiently introduced and stably expressed using recombinase-mediated cassette exchange (RMCE). The new tools described here will be useful for a variety of studies using cattle.
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15
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Ma L, Wang Y, Wang H, Hu Y, Chen J, Tan T, Hu M, Liu X, Zhang R, Xing Y, Zhao Y, Hu X, Li N. Screen and Verification for Transgene Integration Sites in Pigs. Sci Rep 2018; 8:7433. [PMID: 29743638 PMCID: PMC5943519 DOI: 10.1038/s41598-018-24481-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 03/15/2018] [Indexed: 01/01/2023] Open
Abstract
Efficient transgene expression in recipient cells constitutes the primary step in gene therapy. However, random integration in host genome comprises too many uncertainties. Our study presents a strategy combining bioinformatics and functional verification to find transgene integration sites in pig genome. Using an in silico approach, we screen out two candidate sites, namely, Pifs302 and Pifs501, located in actively transcribed intergenic regions with low nucleosome formation potential and without potential non-coding RNAs. After CRISPR/Cas9-mediated site-specific integration on Pifs501, we detected high EGFP expression in different pig cell types and ubiquitous EGFP expression in diverse tissues of transgenic pigs without adversely affecting 600 kb neighboring gene expression. Promoters integrated on Pifs501 exhibit hypomethylated modification, which suggest a permissive epigenetic status of this locus. We establish a versatile master cell line on Pifs501, which allows us to achieve site-specific exchange of EGFP to Follistatin with Cre/loxP system conveniently. Through in vitro and in vivo functional assays, we demonstrate the effectiveness of this screening method, and take Pifs501 as a potential site for transgene insertion in pigs. We anticipate that Pifs501 will have useful applications in pig genome engineering, though the identification of genomic safe harbor should over long-term various functional studies.
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Affiliation(s)
- Linyuan Ma
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Yuzhe Wang
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Haitao Wang
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Yiqing Hu
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Jingyao Chen
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Tan Tan
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Man Hu
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Xiaojuan Liu
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Ran Zhang
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Yiming Xing
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Yiqiang Zhao
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China. .,Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, Beijing, China.
| | - Xiaoxiang Hu
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China
| | - Ning Li
- The State Key Laboratory for Agricultural Biotechnology, College of Biological Science, China Agricultural University, Beijing, 100193, China.
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16
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Site-Specific Fat-1 Knock-In Enables Significant Decrease of n-6PUFAs/n-3PUFAs Ratio in Pigs. G3-GENES GENOMES GENETICS 2018; 8:1747-1754. [PMID: 29563188 PMCID: PMC5940165 DOI: 10.1534/g3.118.200114] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The fat-1 gene from Caenorhabditis elegans encodes a fatty acid desaturase which was widely studied due to its beneficial function of converting n-6 polyunsaturated fatty acids (n-6PUFAs) to n-3 polyunsaturated fatty acids (n-3PUFAs). To date, many fat-1 transgenic animals have been generated to study disease pathogenesis or improve meat quality. However, all of them were generated using a random integration method with variable transgene expression levels and the introduction of selectable marker genes often raise biosafety concern. To this end, we aimed to generate marker-free fat-1 transgenic pigs in a site-specific manner. The Rosa26 locus, first found in mouse embryonic stem cells, has become one of the most common sites for inserting transgenes due to its safe and ubiquitous expression. In our study, the fat-1 gene was inserted into porcine Rosa 26 (pRosa26) locus via Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)/CRISPR-associated 9 (Cas9) system. The Southern blot analysis of our knock-in pigs indicated a single copy of the fat-1 gene at the pRosa26 locus. Furthermore, this single-copy fat-1 gene supported satisfactory expression in a variety of tissues in F1 generation pigs. Importantly, the gas chromatography analysis indicated that these fat-1 knock-in pigs exhibited a significant increase in the level of n-3PUFAs, leading to an obvious decrease in the n-6PUFAs/n-3PUFAs ratio from 9.36 to 2.12 (***P < 0.0001). Altogether, our fat-1 knock-in pigs hold great promise for improving the nutritional value of pork and serving as an animal model to investigate therapeutic effects of n-3PUFAs on various diseases.
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Liu T, Hu Y, Guo S, Tan L, Zhan Y, Yang L, Liu W, Wang N, Li Y, Zhang Y, Liu C, Yang Y, Adelstein RS, Wang A. Identification and characterization of MYH9 locus for high efficient gene knock-in and stable expression in mouse embryonic stem cells. PLoS One 2018; 13:e0192641. [PMID: 29438440 PMCID: PMC5811019 DOI: 10.1371/journal.pone.0192641] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 01/26/2018] [Indexed: 01/22/2023] Open
Abstract
Targeted integration of exogenous genes into so-called safe harbors/friend sites, offers the advantages of expressing normal levels of target genes and preventing potentially adverse effects on endogenous genes. However, the ideal genomic loci for this purpose remain limited. Additionally, due to the inherent and unresolved issues with the current genome editing tools, traditional embryonic stem (ES) cell-based targeted transgenesis technology is still preferred in practical applications. Here, we report that a high and repeatable homologous recombination (HR) frequency (>95%) is achieved when an approximate 6kb DNA sequence flanking the MYH9 gene exon 2 site is used to create the homology arms for the knockout/knock-in of diverse nonmuscle myosin II (NM II) isoforms in mouse ES cells. The easily obtained ES clones greatly facilitated the generation of multiple NM II genetic replacement mouse models, as characterized previously. Further investigation demonstrated that though the targeted integration site for exogenous genes is shifted to MYH9 intron 2 (about 500bp downstream exon 2), the high HR efficiency and the endogenous MYH9 gene integrity are not only preserved, but the expected expression of the inserted gene(s) is observed in a pre-designed set of experiments conducted in mouse ES cells. Importantly, we confirmed that the expression and normal function of the endogenous MYH9 gene is not affected by the insertion of the exogenous gene in these cases. Therefore, these findings suggest that like the commonly used ROSA26 site, the MYH9 gene locus may be considered a new safe harbor for high-efficiency targeted transgenesis and for biomedical applications.
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Affiliation(s)
- Tanbin Liu
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Yi Hu
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Shiyin Guo
- College of Food Science and Technology, HUNAU, Changsha, Hunan, China
| | - Lei Tan
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Yang Zhan
- Lab of Functional Proteomics (LFP), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, HUNAU, Changsha, Hunan, China
| | - Lingchen Yang
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Wei Liu
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Naidong Wang
- Lab of Functional Proteomics (LFP), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, HUNAU, Changsha, Hunan, China
| | - Yalan Li
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Yingfan Zhang
- Lab of Molecular Cardiology (LMC), National Heart, Lung, and Blood Institute (NHLBI)/National Institutes of Health (NIH), Bethesda, MD, United States of America
| | - Chengyu Liu
- Transgenic Core, NHLBI/ NIH, Bethesda, MD, United States of America
| | - Yi Yang
- Lab of Functional Proteomics (LFP), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, HUNAU, Changsha, Hunan, China
| | - Robert S. Adelstein
- Lab of Molecular Cardiology (LMC), National Heart, Lung, and Blood Institute (NHLBI)/National Institutes of Health (NIH), Bethesda, MD, United States of America
| | - Aibing Wang
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
- Lab of Molecular Cardiology (LMC), National Heart, Lung, and Blood Institute (NHLBI)/National Institutes of Health (NIH), Bethesda, MD, United States of America
- * E-mail:
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18
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Shepelev MV, Kalinichenko SV, Deykin AV, Korobko IV. Production of Recombinant Proteins in the Milk of Transgenic Animals: Current State and Prospects. Acta Naturae 2018; 10:40-47. [PMID: 30397525 PMCID: PMC6209402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The use of transgenic animals as bioreactors for the synthesis of the recombinant proteins secreted into milk is a current trend in the development of biotechnologies. Advances in genetic engineering, in particular the emergence of targeted genome editing technologies, have provided new opportunities and significantly improved efficiency in the generation of animals that produce recombinant proteins in milk, including economically important animals. Here, we present a retrospective review of technologies for generating transgenic animals, with emphasis on the creation of animals that produce recombinant proteins in milk. The current state and prospects for the development of this area of biotechnology are discussed in relation to the emergence of novel genome editing technologies. Experimental and practical techniques are briefly discussed.
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Affiliation(s)
- M. V. Shepelev
- Institute of Gene Biology, Russian Academy of Sciences, Vavilova Str., 34/5, Moscow, 119334, Russia
| | - S. V. Kalinichenko
- Institute of Gene Biology, Russian Academy of Sciences, Vavilova Str., 34/5, Moscow, 119334, Russia
| | - A. V. Deykin
- Institute of Gene Biology, Russian Academy of Sciences, Vavilova Str., 34/5, Moscow, 119334, Russia
| | - I. V. Korobko
- Institute of Gene Biology, Russian Academy of Sciences, Vavilova Str., 34/5, Moscow, 119334, Russia
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19
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Xie Z, Pang D, Wang K, Li M, Guo N, Yuan H, Li J, Zou X, Jiao H, Ouyang H, Li Z, Tang X. Optimization of a CRISPR/Cas9-mediated Knock-in Strategy at the Porcine Rosa26 Locus in Porcine Foetal Fibroblasts. Sci Rep 2017; 7:3036. [PMID: 28596588 PMCID: PMC5465212 DOI: 10.1038/s41598-017-02785-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 04/19/2017] [Indexed: 01/22/2023] Open
Abstract
Genetically modified pigs have important roles in agriculture and biomedicine. However, genome-specific knock-in techniques in pigs are still in their infancy and optimal strategies have not been extensively investigated. In this study, we performed electroporation to introduce a targeting donor vector (a non-linearized vector that did not contain a promoter or selectable marker) into Porcine Foetal Fibroblasts (PFFs) along with a CRISPR/Cas9 vector. After optimization, the efficiency of the EGFP site-specific knock-in could reach up to 29.6% at the pRosa26 locus in PFFs. Next, we used the EGFP reporter PFFs to address two key conditions in the process of achieving transgenic pigs, the limiting dilution method and the strategy to evaluate the safety and feasibility of the knock-in locus. This study demonstrates that we establish an efficient procedures for the exogenous gene knock-in technique and creates a platform to efficiently generate promoter-less and selectable marker-free transgenic PFFs through the CRISPR/Cas9 system. This study should contribute to the generation of promoter-less and selectable marker-free transgenic pigs and it may provide insights into sophisticated site-specific genome engineering techniques for additional species.
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Affiliation(s)
- Zicong Xie
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Daxin Pang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Kankan Wang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Mengjing Li
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Nannan Guo
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Hongming Yuan
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Jianing Li
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Xiaodong Zou
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Huping Jiao
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Hongsheng Ouyang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Zhanjun Li
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Xiaochun Tang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China.
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20
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Yum SY, Yoon KY, Lee CI, Lee BC, Jang G. Transgenesis for pig models. J Vet Sci 2017; 17:261-8. [PMID: 27030199 PMCID: PMC5037292 DOI: 10.4142/jvs.2016.17.3.261] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 02/12/2016] [Indexed: 11/20/2022] Open
Abstract
Animal models, particularly pigs, have come to play an important role in translational biomedical research. There have been many pig models with genetically modifications via somatic cell nuclear transfer (SCNT). However, because most transgenic pigs have been produced by random integration to date, the necessity for more exact gene-mutated models using recombinase based conditional gene expression like mice has been raised. Currently, advanced genome-editing technologies enable us to generate specific gene-deleted and -inserted pig models. In the future, the development of pig models with gene editing technologies could be a valuable resource for biomedical research.
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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 08826, Korea
| | - Ki-Young Yoon
- 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 08826, Korea.,Department of Biotechnology & Laboratory Animals, Shingu College, Seongnam 13174, Korea
| | - Choong-Il Lee
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 08826, Korea
| | - Byeong-Chun Lee
- 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 08826, 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 08826, Korea.,Emergence Center for Food-Medicine Personalized Therapy System, Advanced Institutes of Convergence Technology, Seoul National University, Suwon 16229, Korea.,Farm Animal Clinical Training and Research Center, Institutes of GreenBio Science Technology, Seoul National University, Pyeongchang 25354, Korea
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21
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Wang K, Tang X, Liu Y, Xie Z, Zou X, Li M, Yuan H, Ouyang H, Jiao H, Pang D. Efficient Generation of Orthologous Point Mutations in Pigs via CRISPR-assisted ssODN-mediated Homology-directed Repair. MOLECULAR THERAPY. NUCLEIC ACIDS 2016; 5:e396. [PMID: 27898095 PMCID: PMC5155319 DOI: 10.1038/mtna.2016.101] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 10/18/2016] [Indexed: 12/13/2022]
Abstract
Precise genome editing in livestock is of great value for the fundamental investigation of disease modeling. However, genetically modified pigs carrying subtle point mutations were still seldom reported despite the rapid development of programmable endonucleases. Here, we attempt to investigate single-stranded oligonucleotides (ssODN) mediated knockin by introducing two orthologous pathogenic mutations, p.E693G for Alzheimer's disease and p.G2019S for Parkinson's disease, into porcine APP and LRRK2 loci, respectively. Desirable homology-directed repair (HDR) efficiency was achieved in porcine fetal fibroblasts (PFFs) by optimizing the dosage and length of ssODN templates. Interestingly, incomplete HDR alleles harboring partial point mutations were observed in single-cell colonies, which indicate the complex mechanism of ssODN-mediated HDR. The effect of mutation-to-cut distance on incorporation rate was further analyzed by deep sequencing. We demonstrated that a mutation-to-cut distance of 11 bp resulted in a remarkable difference in HDR efficiency between two point mutations. Finally, we successfully obtained one cloned piglet harboring the orthologous p.C313Y mutation at the MSTN locus via somatic cell nuclear transfer (SCNT). Our proof-of-concept study demonstrated efficient ssODN-mediated incorporation of pathogenic point mutations in porcine somatic cells, thus facilitating further development of disease modeling and genetic breeding in pigs.
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Affiliation(s)
- Kankan Wang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Xiaochun Tang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Yan Liu
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, PR China
| | - Zicong Xie
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Xiaodong Zou
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Mengjing Li
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Hongming Yuan
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Hongsheng Ouyang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Huping Jiao
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
| | - Daxin Pang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, Department of Animal Biotechnology, College of Animal Science, Jilin University, Changchun, PR China
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22
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Wu M, Wei C, Lian Z, Liu R, Zhu C, Wang H, Cao J, Shen Y, Zhao F, Zhang L, Mu Z, Wang Y, Wang X, Du L, Wang C. Rosa26-targeted sheep gene knock-in via CRISPR-Cas9 system. Sci Rep 2016; 6:24360. [PMID: 27063570 PMCID: PMC4827023 DOI: 10.1038/srep24360] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 03/29/2016] [Indexed: 01/14/2023] Open
Abstract
Recent advances in our ability to design DNA binding factors with specificity for desired sequences have resulted in a revolution in genetic engineering, enabling directed changes to the genome to be made relatively easily. Technologies that facilitate specific and precise genome editing, such as knock-in, are critical for determining the functions of genes and for understanding fundamental biological processes. The CRISPR/Cas9 system has recently emerged as a powerful tool for functional genomic studies in mammals. Rosa26 gene can encode a non-essential nuclear RNA in almost all organizations, and become a hot point of exogenous gene insertion. Here, we describe efficient, precise CRISPR/Cas9-mediated Integration using a donor vector with tGFP sequence targeted in the sheep genomic Rosa26 locus. We succeeded in integrating with high efficiency an exogenous tGFP (turboGFP) gene into targeted genes in frame. Due to its simplicity, design flexibility, and high efficiency, we propose that CRISPR/Cas9-mediated knock-in will become a standard method for the generation transgenic sheep.
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Affiliation(s)
- Mingming Wu
- College of animal science and technology, China Agricultural University, Beijing 100193, China
| | - Caihong Wei
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Zhengxing Lian
- College of animal science and technology, China Agricultural University, Beijing 100193, China
| | - Ruizao Liu
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Caiye Zhu
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huihua Wang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Jiaxue Cao
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yuelei Shen
- Beijing Biocytogen Co., Ltd, Beijing 100176, China
| | - Fuping Zhao
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Li Zhang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Zhu Mu
- College of life science and technology, Jinan university, Guangzhou 510632, China
| | - Yayu Wang
- College of life science and technology, Jinan university, Guangzhou 510632, China
| | - Xiaogang Wang
- College of life science and technology, Jinan university, Guangzhou 510632, China
| | - Lixin Du
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Chuduan Wang
- College of animal science and technology, China Agricultural University, Beijing 100193, China
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23
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Ohtsuka M, Miura H, Mochida K, Hirose M, Hasegawa A, Ogura A, Mizutani R, Kimura M, Isotani A, Ikawa M, Sato M, Gurumurthy CB. One-step generation of multiple transgenic mouse lines using an improved Pronuclear Injection-based Targeted Transgenesis (i-PITT). BMC Genomics 2015; 16:274. [PMID: 25887549 PMCID: PMC4404087 DOI: 10.1186/s12864-015-1432-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 03/04/2015] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND The pronuclear injection (PI) is the simplest and widely used method to generate transgenic (Tg) mice. Unfortunately, PI-based Tg mice show uncertain transgene expression due to random transgene insertion in the genome, usually with multiple copies. Thus, typically at least three or more Tg lines are produced by injecting over 200 zygotes and the best line/s among them are selected through laborious screening steps. Recently, we developed technologies using Cre-loxP system that allow targeted insertion of single-copy transgene into a predetermined locus through PI. We termed the method as PI-based Targeted Transgenesis (PITT). A similar method using PhiC31-attP/B system was reported subsequently. RESULTS Here, we developed an improved-PITT (i-PITT) method by combining Cre-loxP, PhiC31-attP/B and FLP-FRT systems directly under C57BL/6N inbred strain, unlike the mixed strain used in previous reports. The targeted Tg efficiency in the i-PITT typically ranged from 10 to 30%, with 47 and 62% in two of the sessions, which is by-far the best Tg rate reported. Furthermore, the system could generate multiple Tg mice simultaneously. We demonstrate that injection of up to three different Tg cassettes in a single injection session into as less as 181 zygotes resulted in production of all three separate Tg DNA containing targeted Tg mice. CONCLUSIONS The i-PITT system offers several advantages compared to previous methods: multiplexing capability (i-PITT is the only targeted-transgenic method that is proven to generate multiple different transgenic lines simultaneously), very high efficiency of targeted-transgenesis (up to 62%), significantly reduces animal numbers in mouse-transgenesis and the system is developed under C57BL/6N strain, the most commonly used pure genetic background. Further, the i-PITT system is freely accessible to scientific community.
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Affiliation(s)
- Masato Ohtsuka
- Department of Molecular Life Science, Division of Basic Medical Science and Molecular Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan.
| | - Hiromi Miura
- Department of Molecular Life Science, Division of Basic Medical Science and Molecular Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan.
| | - Keiji Mochida
- RIKEN BioResource Center, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan.
| | - Michiko Hirose
- RIKEN BioResource Center, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan.
| | - Ayumi Hasegawa
- RIKEN BioResource Center, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan.
| | - Atsuo Ogura
- RIKEN BioResource Center, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan. .,Graduate School of Life and Environmental Science, University of Tsukuba, 1-1-1 Ten-noudai, Tsukuba, Ibaraki, 305-8572, Japan.
| | - Ryuta Mizutani
- Graduate School of Engineering, Tokai University, Kitakaname, Hiratsuka, Kanagawa, 259-1292, Japan.
| | - Minoru Kimura
- Department of Molecular Life Science, Division of Basic Medical Science and Molecular Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa, 259-1193, Japan.
| | - Ayako Isotani
- Immunology Frontier Research Center, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Masahito Ikawa
- Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
| | - Masahiro Sato
- Section of Gene Expression Regulation, Frontier Science Research Center, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima, Kagoshima, 890-8544, Japan.
| | - Channabasavaiah B Gurumurthy
- Mouse Genome Engineering Core Facility, Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
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