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Zhou ZP, Yang LL, Cao H, Chen ZR, Zhang Y, Wen XY, Hu J. In Vitro Validation of a CRISPR-Mediated CFTR Correction Strategy for Preclinical Translation in Pigs. Hum Gene Ther 2019; 30:1101-1116. [PMID: 31099266 DOI: 10.1089/hum.2019.074] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Early efforts in cystic fibrosis (CF) gene therapy faced major challenges in delivery efficiency and sustained therapeutic gene expression. Recent advancements in engineered site-specific endonucleases such as clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 make permanent CF transmembrane conductance regulator (CFTR) gene correction possible. However, because of safety concerns of the CRISPR/Cas9 system and challenges in in vivo delivery to inflamed CF airway, CRISPR-based gene correction strategies need to be tested in proper animal models. In this study, we aimed at creating vectors for testing CFTR gene correction in pig models. We constructed helper-dependent adenoviral (HD-Ad) vectors to deliver CRISPR/Cas9 and a donor template (a 6 kb LacZ or 8.7 kb human CFTR expression cassette) into cultured pig cells. We demonstrated precise integration of each donor into the GGTA1 safe harbor through Cas9-induced homology directed repair with 3 kb homology arms. In addition, we showed that both LacZ and hCFTR were persistently expressed in transduced cells. Furthermore, we created a CFTR-deficient cell line for testing CFTR correction. We detected hCFTR mRNA and protein expression in cells transduced with the hCFTR vector. We also demonstrated CFTR function in the CF cells transduced with the HD-Ad delivering the CRISPR-Cas9 system and hCFTR donor at late cellular passages using the membrane potential sensitive dye-based assay (FLIPR®). Combined with our previous report on gene delivery to pig airway basal cells, these data provide the feasibility of testing CRISPR/Cas9-mediated permanent human CFTR correction through HD-Ad vector delivery in pigs.
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Affiliation(s)
- Zhichang Peter Zhou
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada.,Program of Translational Medicine, The Hospital for Sick Children, Toronto, Canada.,Zebrafish Centre for Advanced Drug Discovery and Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Canada
| | - Liang Leo Yang
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada.,Program of Translational Medicine, The Hospital for Sick Children, Toronto, Canada
| | - Huibi Cao
- Program of Translational Medicine, The Hospital for Sick Children, Toronto, Canada
| | - Ziyan Rachel Chen
- Program of Translational Medicine, The Hospital for Sick Children, Toronto, Canada
| | - Yiqian Zhang
- Program of Translational Medicine, The Hospital for Sick Children, Toronto, Canada
| | - Xiao-Yan Wen
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada.,Zebrafish Centre for Advanced Drug Discovery and Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Toronto, Canada.,Department of Medicine, Physiology and Institute of Medical Science, University of Toronto, Toronto, Canada
| | - Jim Hu
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada.,Program of Translational Medicine, The Hospital for Sick Children, Toronto, Canada
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Kim SE, Kim JW, Kim YJ, Kwon DN, Kim JH, Kang MJ. Generation of Fibroblasts Lacking the Sal-like 1 Gene by Using Transcription Activator-like Effector Nuclease-mediated Homologous Recombination. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2016; 29:564-70. [PMID: 26949958 PMCID: PMC4782092 DOI: 10.5713/ajas.15.0244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 07/07/2015] [Accepted: 08/07/2015] [Indexed: 11/27/2022]
Abstract
The Sal-like 1 gene (Sall1) is essential for kidney development, and mutations in this gene result in abnormalities in the kidneys. Mice lacking Sall1 show agenesis or severe dysgenesis of the kidneys. In a recent study, blastocyst complementation was used to develop mice and pigs with exogenic organs. In the present study, transcription activator-like effector nuclease (TALEN)-mediated homologous recombination was used to produce Sall1-knockout porcine fibroblasts for developing knockout pigs. The vector targeting the Sall1 locus included a 5.5-kb 5′ arm, 1.8-kb 3′ arm, and a neomycin resistance gene as a positive selection marker. The knockout vector and TALEN were introduced into porcine fibroblasts by electroporation. Antibiotic selection was performed over 11 days by using 300 μg/mL G418. DNA of cells from G418-resistant colonies was amplified using polymerase chain reaction (PCR) to confirm the presence of fragments corresponding to the 3′ and 5′ arms of Sall1. Further, mono- and bi-allelic knockout cells were isolated and analyzed using PCR–restriction fragment length polymorphism. The results of our study indicated that TALEN-mediated homologous recombination induced bi-allelic knockout of the endogenous gene.
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Affiliation(s)
- Se Eun Kim
- Department of Animal Biotechnology, Konkuk University, Seoul 143-701, Korea
| | - Ji Woo Kim
- Department of Animal Biotechnology, Konkuk University, Seoul 143-701, Korea
| | - Yeong Ji Kim
- Department of Animal Biotechnology, Konkuk University, Seoul 143-701, Korea
| | - Deug-Nam Kwon
- Department of Animal Biotechnology, Konkuk University, Seoul 143-701, Korea
| | - Jin-Hoi Kim
- Department of Animal Biotechnology, Konkuk University, Seoul 143-701, Korea
| | - Man-Jong Kang
- Department of Animal Biotechnology, Konkuk University, Seoul 143-701, Korea
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Lee SM, Kim JW, Jeong YH, Kim SE, Kim YJ, Moon SJ, Lee JH, Kim KJ, Kim MK, Kang MJ. Knock-in of Enhanced Green Fluorescent Protein or/and Human Fibroblast Growth Factor 2 Gene into β-Casein Gene Locus in the Porcine Fibroblasts to Produce Therapeutic Protein. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2014; 27:1644-51. [PMID: 25358326 PMCID: PMC4213711 DOI: 10.5713/ajas.2014.14222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 06/06/2014] [Accepted: 06/24/2014] [Indexed: 12/02/2022]
Abstract
Transgenic animals have become important tools for the production of therapeutic proteins in the domestic animal. Production efficiencies of transgenic animals by conventional methods as microinjection and retrovirus vector methods are low, and the foreign gene expression levels are also low because of their random integration in the host genome. In this study, we investigated the homologous recombination on the porcine β-casein gene locus using a knock-in vector for the β-casein gene locus. We developed the knock-in vector on the porcine β-casein gene locus and isolated knock-in fibroblast for nuclear transfer. The knock-in vector consisted of the neomycin resistance gene (neo) as a positive selectable marker gene, diphtheria toxin-A gene as negative selection marker, and 5′ arm and 3′ arm from the porcine β-casein gene. The secretion of enhanced green fluorescent protein (EGFP) was more easily detected in the cell culture media than it was by western blot analysis of cell extract of the HC11 mouse mammary epithelial cells transfected with EGFP knock-in vector. These results indicated that a knock-in system using β-casein gene induced high expression of transgene by the gene regulatory sequence of endogenous β-casein gene. These fibroblasts may be used to produce transgenic pigs for the production of therapeutic proteins via the mammary glands.
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Affiliation(s)
- Sang Mi Lee
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Ji Woo Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Young-Hee Jeong
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Se Eun Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Yeong Ji Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Seung Ju Moon
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Ji-Hye Lee
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Keun-Jung Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Min-Kyu Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
| | - Man-Jong Kang
- Department of Animal Science and Biotechnology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea
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