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Liang J, Cui J, Cheng J, Pan Y, Zhang R, Yang S, Zou L. SIRT6 Knockdown in Buffalo Fetal Fibroblasts Exacerbates Premature Senescence Caused by DNA and Telomere Damage. Cell Reprogram 2023; 25:277-287. [PMID: 37725013 DOI: 10.1089/cell.2023.0048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2023] Open
Abstract
As a gene with antiaging functions, sirtuin6 (SIRT6) belonging to the sirtuin family plays a vital role in DNA repair, telomerase function, and cellular senescence, as well as maintains epigenomic stability and promotes longevity. However, its role in cell senescence in large animals, such as buffaloes, remains unknown. Fibroblasts are commonly used for somatic reprogramming, and their physiological characteristics affect the efficiency of this process. We aimed to elucidate the role of SIRT6 in cellular senescence and proliferation and analyze its effect on the biological function of buffalo fibroblasts to help improve the efficiency of buffalo somatic cell reprogramming. The expression of SIRT6 and related DNA damage was measured in buffalo fibroblasts obtained at different developmental stages (in the fetus and at 3 and 10 years of age), and the effect of SIRT6 knockdown on the senescence of buffalo fetal fibroblast was investigated. An inverse relationship was observed between SIRT6 expression and senescence in buffalo fibroblasts obtained from animals of various ages. This was accompanied by decreased cell growth, viability, and increased DNA damage. Short hairpin RNA-mediated SIRT6 knockdown accelerated the senescence of buffalo fetal fibroblasts. It blocked the cell cycle during in vitro cell culture, which further enhanced DNA damage, particularly with respect to the telomeres. Collectively, our findings suggest that SIRT6 expression was closely associated with buffalo senescence in fibroblasts. These findings serve as a foundation to better understand the cellular functions of SIRT6 and also aid in selecting donor cells for buffalo somatic cell reprogramming.
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Affiliation(s)
- Jingyuan Liang
- Guangxi Key Laboratory of Animal Breeding and Disease Control, College of Animal Science and Technology, Guangxi University, Nanning, PR China
| | - Jiayu Cui
- International Zhuang Medical Hospital Affiliated to Guangxi University Chinese Medicine, Nanning, PR China
| | - Juanru Cheng
- Guangxi Key Laboratory of Animal Breeding and Disease Control, College of Animal Science and Technology, Guangxi University, Nanning, PR China
| | - Yu Pan
- Guangxi Key Laboratory of Animal Breeding and Disease Control, College of Animal Science and Technology, Guangxi University, Nanning, PR China
| | - Ruimen Zhang
- Guangxi Key Laboratory of Animal Breeding and Disease Control, College of Animal Science and Technology, Guangxi University, Nanning, PR China
| | - Sufang Yang
- Guangxi Key Laboratory of Animal Breeding and Disease Control, College of Animal Science and Technology, Guangxi University, Nanning, PR China
- International Zhuang Medical Hospital Affiliated to Guangxi University Chinese Medicine, Nanning, PR China
| | - Lingxiu Zou
- Guangxi Key Laboratory of Animal Breeding and Disease Control, College of Animal Science and Technology, Guangxi University, Nanning, PR China
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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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Effect of bFGF on fibroblasts derived from the golden snub-nosed monkey. Primates 2020; 62:369-378. [PMID: 33211213 DOI: 10.1007/s10329-020-00875-6] [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: 01/26/2020] [Accepted: 10/31/2020] [Indexed: 10/22/2022]
Abstract
Golden snub-nosed monkeys are endangered animals in China, and their cells have been demonstrated to be important as genetic resources and in applications for advancing biological research. Moreover, in primary research, basic fibroblast growth factor (bFGF) is used to promote the proliferation of fibroblasts to create abundant cells for cryopreservation. To further investigate the effect of bFGF on the efficiency of preservation of fibroblasts obtained from an endangered species, a fibroblast cell line was isolated from a dead golden snub-nosed monkey. Cell viability and mitochondrial membrane potential were assessed using CCK8 and JC-1 assay kits. The karyotype was analyzed by chromosomal microarray analysis, while RNA sequencing and gene expression analyses were performed to assess molecular changes in response to bFGF. Flow cytometry was used to characterize changes in cell surface markers in response to bFGF treatment. The results showed that cells maintained typical fibroblast morphology, while cell viability and mitochondrial membrane potential were not significantly affected between three and eight passages (p > 0.05). We also observed that the addition of bFGF promoted fibroblast proliferation and increased mitochondrial membrane potential. In addition, the bFGF treatment did not alter the normal karyotype of cells, downregulating fibroblast-associated genes and upregulating those associated with cell regulation, including those of the WNT, PI3K and MAPK pathways. The addition of bFGF also increased CD29, CD90, CD105, CD34 and CD44 expression while decreasing that of CD14 and HLA-DR at the protein level. Taken together, these results demonstrate that bFGF may upregulate the WNT, PI3K and MAPK pathways to promote cell proliferation while also increasing the expression of genes and surface markers associated with mesenchymal and hematopoietic cell linages.
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Bressan FF, Bassanezze V, de Figueiredo Pessôa LV, Sacramento CB, Malta TM, Kashima S, Fantinato Neto P, Strefezzi RDF, Pieri NCG, Krieger JE, Covas DT, Meirelles FV. Generation of induced pluripotent stem cells from large domestic animals. Stem Cell Res Ther 2020; 11:247. [PMID: 32586372 PMCID: PMC7318412 DOI: 10.1186/s13287-020-01716-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/23/2020] [Accepted: 05/07/2020] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Induced pluripotent stem cells (iPSCs) have enormous potential in developmental biology studies and in cellular therapies. Although extensively studied and characterized in human and murine models, iPSCs from animals other than mice lack reproducible results. METHODS Herein, we describe the generation of robust iPSCs from equine and bovine cells through lentiviral transduction of murine or human transcription factors Oct4, Sox2, Klf4, and c-Myc and from human and murine cells using similar protocols, even when different supplementations were used. The iPSCs were analyzed regarding morphology, gene and protein expression of pluripotency factors, alkaline phosphatase detection, and spontaneous and induced differentiation. RESULTS Although embryonic-derived stem cells are yet not well characterized in domestic animals, generation of iPS cells from these species is possible through similar protocols used for mouse or human cells, enabling the use of pluripotent cells from large animals for basic or applied purposes. Herein, we also infer that bovine iPS (biPSCs) exhibit similarity to mouse iPSCs (miPSCs), whereas equine iPSs (eiPSCs) to human (hiPSCs). CONCLUSIONS The generation of reproducible protocols in different animal species will provide an informative tool for producing in vitro autologous pluripotent cells from domestic animals. These cells will create new opportunities in animal breeding through transgenic technology and will support a new era of translational medicine with large animal models.
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Affiliation(s)
- Fabiana Fernandes Bressan
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, Brazil
- Postgraduate Program in Anatomy of Domestic and Wild Animals, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
- Center for Cell-Based Therapy, Regional Blood Center, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Vinícius Bassanezze
- Heart Institute (INCOR), Faculty of Medicine, University of São Paulo, São Paulo, Brazil
- Present Address: Brigham and Women’s Hospital, Harvard Medical School, Boston, USA
| | - Laís Vicari de Figueiredo Pessôa
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, Brazil
- Postgraduate Program in Anatomy of Domestic and Wild Animals, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Chester Bittencourt Sacramento
- Heart Institute (INCOR), Faculty of Medicine, University of São Paulo, São Paulo, Brazil
- Present Address: Weill Cornell Medicine, Cornell University, Ithaca, USA
| | - Tathiane Maistro Malta
- Center for Cell-Based Therapy, Regional Blood Center, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP Brazil
| | - Simone Kashima
- Center for Cell-Based Therapy, Regional Blood Center, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Paulo Fantinato Neto
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, Brazil
- Postgraduate Program in Anatomy of Domestic and Wild Animals, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
| | - Ricardo De Francisco Strefezzi
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, Brazil
| | - Naira Caroline Godoy Pieri
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, Brazil
| | - José Eduardo Krieger
- Heart Institute (INCOR), Faculty of Medicine, University of São Paulo, São Paulo, Brazil
| | - Dimas Tadeu Covas
- Center for Cell-Based Therapy, Regional Blood Center, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Flávio Vieira Meirelles
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, Brazil
- Postgraduate Program in Anatomy of Domestic and Wild Animals, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
- Center for Cell-Based Therapy, Regional Blood Center, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
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Sanguinet EDO, Siqueira NM, Menezes FDC, Rasia GM, Lothhammer N, Soares RMD, Meirelles FV, Bressan FF, Bos-Mikich A. Interaction of fibroblasts and induced pluripotent stem cells with poly(vinyl alcohol)-based hydrogel substrates. J Biomed Mater Res B Appl Biomater 2019; 108:857-867. [PMID: 31251451 DOI: 10.1002/jbm.b.34439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 05/17/2019] [Accepted: 06/13/2019] [Indexed: 11/07/2022]
Abstract
Induced pluripotent stem cells (iPSCs) provide a promising means of creating custom-tailored cell lines for cellular therapies. Their application in regenerative medicine, however, depends on the possibility that the maintenance and differentiation of cells and organs occur under defined conditions. One major component of stem cell culture systems is the substrate, where the cells must attach and proliferate. The present study aimed to investigate the putative cytotoxic effects of poly(vinyl alcohol) (PVA)-based matrices on the in vitro culture of mouse fetal fibroblasts. In addition, the PVA-based hydrogels were used to determine the capacity of bovine induced pluripotent stem cells (biPSCs) to adhere and proliferate on synthetic substrates. Our results show that both cell types interacted with the substrate and presented proliferation during culture. The biPSCs formed new colonies when cell suspensions were placed onto the hydrogel surface for culture. These results may represent a new characterized xeno-free clinical grade culture system to be widely applied in cell-based therapies.
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Affiliation(s)
- Eduardo de O Sanguinet
- Department of Morphological Sciences, ICBS, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Nataly M Siqueira
- Institute of Chemistry, Department of Organic Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Felipe de C Menezes
- Institute of Chemistry, Department of Organic Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Gisele M Rasia
- Post-Graduate Program of Materials Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Nívia Lothhammer
- Department of Morphological Sciences, ICBS, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Rosane M D Soares
- Institute of Chemistry, Department of Organic Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Flávio V Meirelles
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo (FZEA/USP), Pirassununga, São Paulo, Brazil
| | - Fabiana F Bressan
- Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo (FZEA/USP), Pirassununga, São Paulo, Brazil
| | - Adriana Bos-Mikich
- Department of Morphological Sciences, ICBS, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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Pieri NCG, Mançanares ACF, de Souza AF, Fernandes H, Diaza AMG, Bressan FF, Roballo KCS, Casals JB, Binelli M, Ambrósio CE, Dos Santos Martins D. Xenotransplantation of canine spermatogonial stem cells (cSSCs) regulated by FSH promotes spermatogenesis in infertile mice. Stem Cell Res Ther 2019; 10:135. [PMID: 31109365 PMCID: PMC6528206 DOI: 10.1186/s13287-019-1250-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 04/27/2019] [Accepted: 04/30/2019] [Indexed: 01/15/2023] Open
Abstract
Background Xenotransplantation of spermatogonial stem cells (SSCs) has become a popular topic in various research fields because manipulating these cells can provide insights into the mechanisms associated with germ cell lines and the entire spermatogenesis process; moreover, these cells can be used in several biotechnology applications. To achieve successful xenotransplantation, the in vitro microenvironment in which SSCs are cultured should be an ideal microenvironment for self-renewal and similar to the in vivo testicular microenvironment. The age of the donor, the correct spermatogenesis cycle, and the quality of the donor tissue are also important. Although cell culture-related factors, such as the in vitro supplementation of hormonal factors, are known to promote successful xenotransplantation in mice, little is known about the influence of these factors on SSCs in vitro or in vivo in other mammalian species, such as dogs (Canis lupus familiaris). In this context, the goals of this study were to test the effect of follicle-stimulating hormone (FSH) on canine spermatogonial stem cell (cSSC) cultures since this hormone is related to the glial cell-derived neurotrophic factor (GDNF) signaling pathway, which is responsible for the self-renewal and maintenance of these cells in vivo, and to investigate the microenvironment of the SSC culture after FSH supplementation. Additionally, in vivo analyses of transplanted FSH-supplemented cSSCs in the testes of infertile mice were performed to assess the capacity of cSSCs to develop, maintain, and restore spermatogenesis. Methods SSCs from canine prepubertal testes (aged 3 months) were cultured in vitro in the presence of FSH (10 IU L−1). GFRA1 transcript expression was detected to confirm the spermatogonia population in culture and the effect of FSH on these cells. The protein and transcript levels of late germ cell markers (GFRA1, DAZL, STRA8, PLZF, and CD49f) and a pluripotency marker (OCT4) were detected at 72 and 120 h to confirm the cSSC phenotype. In vivo experiments were performed by transplanting GFP+ cSSCs into infertile mice, and a 10-week follow-up was performed. Histological and immunofluorescence analyses were performed to confirm the repopulation capacity after cSSC xenotransplantation in the testis. Results Supplementation with FSH in cell culture increased the number of cSSCs positive for GFRA1. The cSSCs were also positive for the pluripotency and early germline marker OCT4 and the late germline markers PLZF, DAZL, C-kit, and GFRA-1. The in vivo experiments showed that the cSSCs xenotransplanted into infertile mouse testes were able to repopulate germline cells in the seminiferous tubules of mice. Conclusions In conclusion, our results showed for the first time that the treatment of cSSC cultures with FSH can promote in vitro self-renewal, increase the population of germline cells, and possibly influence the success of spermatogenesis in infertile mice in vivo.
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Affiliation(s)
- Naira Caroline Godoy Pieri
- Department of Surgery, Faculty of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, Sao Paulo, SP, Brazil. .,Department of Reproduction, Faculty of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, Sao Paulo, SP, Brazil.
| | | | - Aline Fernanda de Souza
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil
| | - Hugo Fernandes
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil
| | - Angela Maria Gonella Diaza
- North Florida Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Marianna, FL, USA
| | - Fabiana Fernandes Bressan
- Department of Surgery, Faculty of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, Sao Paulo, SP, Brazil.,Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil
| | - Kelly Cristine Santos Roballo
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil.,School of Pharmacy at University of Wyoming, 1000 E. University Avenue, Laramie, 82071, USA
| | - Juliana Barbosa Casals
- Department of Surgery, Faculty of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, Sao Paulo, SP, Brazil
| | - Mario Binelli
- Department of Animal Sciences, University of Florida, L.E. "Red" Larson Building, Bldg. 499, Room 122 C, Gainesville, FL, 32611-0910, USA
| | - Carlos Eduardo Ambrósio
- Department of Surgery, Faculty of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, Sao Paulo, SP, Brazil.,Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil
| | - Daniele Dos Santos Martins
- Department of Surgery, Faculty of Veterinary Medicine and Animal Sciences, University of São Paulo, Av. Prof. Dr. Orlando Marques de Paiva, 87, Sao Paulo, SP, Brazil.,Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, Brazil
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Mehta P, Kaushik R, Singh KP, Sharma A, Singh MK, Chauhan MS, Palta P, Singla SK, Manik RS. Establishment, Growth, Proliferation, and Gene Expression of Buffalo (Bubalus bubalis) Transgenic Fetal Fibroblasts Containing Human Insulin Gene, and Production of Embryos by Handmade Cloning Using These Cells. Cell Reprogram 2018; 20:135-143. [DOI: 10.1089/cell.2017.0013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Parul Mehta
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Ramakant Kaushik
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Karn Pratap Singh
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Ankur Sharma
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Manoj Kumar Singh
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Manmohan Singh Chauhan
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Prabhat Palta
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Suresh Kumar Singla
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
| | - Radhey Sham Manik
- Embryo Biotechnology Laboratory, Animal Biotechnology Center, ICAR-National Dairy Research Institute, Karnal, India
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Whitworth KM, Cecil R, Benne JA, Redel BK, Spate LD, Samuel MS, Prather RS, Wells KD. Zygote injection of RNA encoding Cre recombinase results in efficient removal of LoxP flanked neomycin cassettes in pigs. Transgenic Res 2018. [PMID: 29516259 DOI: 10.1007/s11248-018-0064-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Genetically engineered pigs are often created with a targeting vector that contains a loxP flanked selectable marker like neomycin. The Cre-loxP recombinase system can be used to remove the selectable marker gene from the resulting offspring or cell line. Here is described a new method to remove a loxP flanked neomycin cassette by direct zygote injection of an mRNA encoding Cre recombinase. The optimal concentration of mRNA was determined to be 10 ng/μL when compared to 2 and 100 ng/μL (P < 0.0001). Development to the blastocyst stage was 14.1% after zygote injection with 10 ng/μL. This method successfully removed the neomycin cassette in 81.9% of injected in vitro derived embryos; which was significantly higher than the control (P < 0.0001). Embryo transfer resulted in the birth of one live piglet with a Cre deleted neomycin cassette. The new method described can be used to efficiently remove selectable markers in genetically engineered animals without the need for long term cell culture and subsequent somatic cell nuclear transfer.
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Affiliation(s)
- Kristin M Whitworth
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA
| | - Raissa Cecil
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA
| | - Joshua A Benne
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA
| | - Bethany K Redel
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA
| | - Lee D Spate
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA
| | - Melissa S Samuel
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA
| | - Randall S Prather
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA
| | - Kevin D Wells
- Division of Animal Sciences, University of Missouri, 159 ASRC, 920 East Campus Dr., Columbia, MO, 65211, USA.
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Knock-in fibroblasts and transgenic blastocysts for expression of human FGF2 in the bovine β-casein gene locus using CRISPR/Cas9 nuclease-mediated homologous recombination. ZYGOTE 2015. [PMID: 26197710 DOI: 10.1017/s0967199415000374] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Many transgenic domestic animals have been developed to produce therapeutic proteins in the mammary gland, and this approach is one of the most important methods for agricultural and biomedical applications. However, expression and secretion of a protein varies because transgenes are integrated at random sites in the genome. In addition, distal enhancers are very important for transcriptional gene regulation and tissue-specific gene expression. Development of a vector system regulated accurately in the genome is needed to improve production of therapeutic proteins. The objective of this study was to develop a knock-in system for expression of human fibroblast growth factor 2 (FGF2) in the bovine β-casein gene locus. The F2A sequence was fused to the human FGF2 gene and inserted into exon 3 of the β-casein gene. We detected expression of human FGF2 mRNA in the HC11 mouse mammary epithelial cells by RT-PCR and human FGF2 protein in the culture media using western blot analysis when the knock-in vector was introduced. We transfected the knock-in vector into bovine ear fibroblasts and produced knock-in fibroblasts using the clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 system. Moreover, the CRISPR/Cas9 system was more efficient than conventional methods. In addition, we produced knock-in blastocysts by somatic cell nuclear transfer using the knock-in fibroblasts. Our knock-in fibroblasts may help to create cloned embryos for development of transgenic dairy cattle expressing human FGF2 protein in the mammary gland via the expression system of the bovine β-casein gene.
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