China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (7): 2484-2496.doi: 10.16431/j.cnki.1671-7236.2022.07.006

• Biotechnology • Previous Articles     Next Articles

Cloning and Bioinformatics Analysis of CYP11A1 Gene in New Zealand White Rabbits and Its Effects on Reproduction-related Genes

BAI Shaocheng1, ZHOU Juan1, JIN Rongshuai1, WANG Fan1, LU Tingting1, TANG Xianwei2, ZHAO Bohao1, WU Xinsheng1, CHEN Yang1   

  1. 1. College of Animal Science and Technology, Yangzhou University, Yangzhou 225000, China;
    2. Jiangsu Province Pizhou Oriental Breeding Co., Ltd., Pizhou 221300, China
  • Received:2022-01-17 Online:2022-07-05 Published:2022-06-29

Abstract: 【Objective】 To analyze the bioinformatics function of cytochrome P450 family 11 subfamily A member 1 (CYP11A1) and the regulation of genes related to reproductive performance in New Zealand White rabbit ovarian granulosa cells,in order to lay the foundation for exploring its regulatory function in follicular development.【Method】 According to the sequence of rabbit CYP11A1 gene in GenBank,specific primers were designed to clone CYP11A1 gene and construct pcDNA3.1-CYP11A1 overexpression recombinant vector from ovary tissue of New Zealand White rabbits.Phylogenetic tree was constructed by Mega 5.1 software. The amino acid composition,physicochemical properties,phosphorylation site,conserved domain,secondary structure,tertiary structure,subcellular location,protein cross-linking of CYP11A1 protein were predicted by bioinformatics softwares. Ovarian granulosa cells were further isolated from ovarian tissue of New Zealand White rabbits and identified by immunofluorescence using specific antibody follicle stimulating hormone receptor (FSHR).Three primers (siRNA-1,siRNA-2,siRNA-3) were designed to interfere the expression of CYP11A1 gene,and the one with the highest interference efficiency was screened,and the overexpressed recombinant vector pcDNA3.1-CYP11A1 and siRNA-CYP11A1 were transfected into ovarian granulosa cells.After RNA was extracted from granulosa cells,then Real-time quantitative PCR was used to analyze the effects of CYP11A1 overexpression and knockdown on the mRNA expression levels of reproductive genes such as HSD17B1,BMP15 and FSHR.【Result】 CYP11A1 gene was successfully cloned from New Zealand White rabbits.The full-length sequence of CDS of CYP11A1 gene of New Zealand White rabbits was 1 557 bp,encoding 518 amino acids,among which leucine (10.6%) was the highest,followed by arginine (7.6%),valine (7.4%) and alanine (7.2%).Evolutionary tree analysis showed that the protein sequence of rabbit CYP11A1 was closest to mice,humans and orangutans.Bioinformatics analysis showed that the theoretical isoelectric point of CYP11A1 protein was 7.4,the number of positive and negative charge residues was 50,the aliphatic amino acid index was 82.16,and the instability index was 39.54,among which the number of hydrophilic residues in amino acid sequence was more than that of hydrophobic ones.This protein had 40 potential phosphorylation sites,among which threonine,serine and tyrosine were the most abundant.The secondary structure of CYP11A1 protein consisted α-helix (48.31%),random coil (40.22%),extended chain (7.42%) and β-turn (4.04%),and the tertiary structure was predicted to be curved helix.Subcellular localization predicted that CYP11A1 protein was mainly distributed in mitochondria (52.2%),cytoplasm (17.4%) and nucleus (13.0%).It also had a domain of P450 family and interacted with multiple proteins related to reproductive performance (STAR,CYP21A2,CYP17A1 and FDX1).The expression of FSHR in isolated granulosa cells was positive,which could be used for subsequent experiments.After CYP11A1 gene was overexpressed in granulosa cells,the expression of HSD17B1 and FSHR genes were significantly upregulated (P<0.05), the expression of BMP15 gene was extremely significantly upregulated (P<0.01).After CYP11A1 gene was interfered,the expression of BMP15 and FSHR genes were extremely significantly down-regulated (P<0.01),and the expression of HSD17B1 gene was significantly down-regulated (P<0.05).【Conclusion】 CYP11A1 gene could regulate the expression of reproductive performance related genes HSD17B1,BMP15 and FSHR in ovarian granulosa cells,suggesting that CYP11A1 played a certain role in the reproductive process of female rabbits.

Key words: New Zealand White rabbits; CYP11A1 gene; bioinformatics; granulosa cells; eukaryotic expression

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