China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (8): 3026-3035.doi: 10.16431/j.cnki.1671-7236.2022.08.018

• Genetics and Breeding • Previous Articles     Next Articles

Study on 264 bp Structural Variation of 3'-flanking Region of CHD3 Gene in Xiang Pigs

HUANG Yueli1,2, RAN Xueqin3, NIU Xi1, LI Sheng1, HUANG Shihui3, WANG Jiafu1   

  1. 1. Key Laboratory of Plant Resource Conservative and Germplasm Innovation in Mountainous Region (Ministry of Education), Institute of Agro-bioengineering, Guizhou University, Guiyang 550025, China;
    2. College of Life Science, Guizhou University, Guiyang 550025, China;
    3. Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region, College of Animal Science, Guizhou University, Guiyang 550025, China
  • Received:2022-02-21 Online:2022-08-05 Published:2022-07-21

Abstract: 【Objective】 This study was aimed to explore the effect of structural variation of chromodomain-helicase-DNA-binding protein 3 (CHD3) gene on the expression of CHD3 gene in different pig breeds, and preliminarily analyze the relationship between the CHD3 gene structural variation and the formation of wrinkle skin in the Xiang pigs.【Method】 In this study, ordinary Xiang pigs, Xiang pigs with wrinkle skin and Large White pigs were selected as the research subjects. UCSC, miRBase, miRanda and RBPsuite softwares were used to predict the repeated elements, miRNA binding sites and RNA binding protein (RBP) binding sites contained in the CHD3 structural variation interval. PCR method was used for genotyping of structural variation. Excel was used to calculate the population genotype frequency and allele frequency, and χ2 test was used to analyze whether the genotype was in Hardy-Weinberg equilibrium. The effect of the variation on CHD3 gene expression was detected by Real-time quantitative PCR and Western blotting.【Result】 Bioinformatics analysis showed that the 3'-flanking region of CHD3 gene was a 254 bp short-scatter element (SINE), belonging to tRNA family, located in Chr12:53 115 742-53 115 995, which contained 35 miRNA binding sites and 10 RBP binding sites. Genotyping results showed that II genotype (insertion), ID genotype (heterozygous) and DD genotype (double deletion) were detected in all three pig groups, indicating that 264 bp structural variation in the 3'-flanking region of CHD3 gene was highly polymorphic in pigs. Genotype population distribution frequency showed that the frequency of D allele in Xiang pigs with wrinkle skin was extremely significantly higher than that in ordinary Xiang pigs and Large White pigs (P<0.01); χ2 test showed that the structural variation of CHD3 gene was in Hardy-Weinberg equilibrium state in Xiang pigs with wrinkle skin and ordinary Xiang pigs (P>0.05), but unbalanced in Large White pigs (P<0.05). Real-time quantitative PCR and Western blotting analysis showed that the mRNA and protein expression of DD and ID genotypes of CHD3 in skin of Xiang pigs were extremely significantly higher than that of II genotype (P<0.01).【Conclusion】 The 264 bp structural variation in the 3'-flanking region of CHD3 gene was a SINE element with regulatory effect, which could promote the metabolism of CHD3 gene mRNA and post-transcriptional translation inhibition through the binding of RNA binding protein and miRNAs to the element, thus regulating the expression of CHD3 gene. The structural variation resulted in abnormal expression and accumulation of CHD3 gene, which might be related to the formation of wrinkled skin in Xiang pigs.

Key words: Xiang pigs; CHD3 gene; structural variation; wrinkled skin

CLC Number: