Generation of Transgenic Cloned Buffalo Embryos Harboring the EGFP Gene in the Y Chromosome Using CRISPR/Cas9-Mediated Targeted Integration
Autor: | Junyu Nie, Kai Xiao, Xianwei Liang, Yangqing Lu, Xiuling Zhao, Yuyan Tang, Wengtan He, Ming Zhang, Chunying Pang |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
p53
040301 veterinary sciences Transgene HDR Biology Green fluorescent protein 0403 veterinary science 03 medical and health sciences PFT-μ medicine Blastocyst Gene CRISPR/Cas9 Original Research 030304 developmental biology 0303 health sciences lcsh:Veterinary medicine General Veterinary Y chromosome Electroporation sex control Embryo 04 agricultural and veterinary sciences Molecular biology Embryonic stem cell medicine.anatomical_structure Somatic cell nuclear transfer lcsh:SF600-1100 Veterinary Science |
Zdroj: | Frontiers in Veterinary Science, Vol 7 (2020) Frontiers in Veterinary Science |
ISSN: | 2297-1769 |
Popis: | Sex control technology is of great significance in the production of domestic animals, especially for rapidly breeding water buffalo (bubalus bubalis), which served as a research model in the present study. We have confirmed that a fluorescence protein integrated into the Y chromosome is fit for sexing pre-implantation embryos in the mouse. Firstly, we optimized the efficiency of targeted integration of exogenous gene encoding enhanced green fluorescent protein (eGFP) and mCherry in Neuro-2a cells, mouse embryonic stem cells, mouse embryonic cells (NIH3T3), buffalo fetal fibroblast (BFF) cells. The results showed that a homology arm length of 800 bp on both sides of the target is more efficient that 300 bp or 300 bp/800 bp. Homology-directed repair (HDR)-mediated knock-in in BFF cells was also significantly improved when cells were supplemented with pifithrin-μ, which is a small molecule that inhibits the binding of p53 to mitochondria. Three pulses at 250 V resulted in the most efficient electroporation in BFF cells and 1.5 μg/mL puromycin was found to be the optimal concentration for screening. Moreover, Y-Chr-eGFP transgenic BFF cells and cloned buffalo embryos were successfully generated using CRISPR/Cas9-mediated gene editing combined with the somatic cell nuclear transfer (SCNT) technique. At passage numbers 6–8, the growth rate and cell proliferation rate were significantly lower in Y-Chr-eGFP transgenic than in non-transgenic BFF cells; the expression levels of the methylation-related genes DNMT1 and DNMT3a were similar; however, the expression levels of the acetylation-related genes HDAC1, HDAC2, and HDAC3 were significantly higher (p < 0.05) in Y-Chr-eGFP transgenic BFF cells compared with non-transgenic cells. Y-Chr-eGFP transgenic BFFs were used as donors for SCNT, the results showed that eGFP reporter is suitable for the visualization of the sex of embryos. The blastocyst rates of cloned buffalo embryos were similar; however, the cleavage rates of transgenic cloned embryos were significantly lower compared with control. In summary, we optimized the protocol for generating transgenic BFF cells and successfully generated Y-Chr-eGFP transgenic embryos using these cells as donors. |
Databáze: | OpenAIRE |
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