China Animal Husbandry and Veterinary Medicine ›› 2024, Vol. 51 ›› Issue (3): 1142-1150.doi: 10.16431/j.cnki.1671-7236.2024.03.026

• Genetics and Breeding • Previous Articles    

Polymorphism of MMP2 Gene and Its Association with Reproductive Traits in Kele Pigs

XIANG Jin1, YANG Qixin2, LUO Hualun4, HONG Yating1, GUO Xiaojiang3, YANG Hongwen2, LI Wei2, WANG Chunyuan1, WU Yan1, ZHANG Yiyu1   

  1. 1. Key Laboratory of Plateau Mountain Animal Genetics, Breeding and Reproduction of Ministry of Education, Key Laboratory of Animal Genetics, Breeding and Reproduction of Guizhou Province, Xiang Pig Research Institute of Guizhou University, College of Animal Science, Guizhou University, Guiyang 550025, China;
    2. Guizhou Provincial Animal Disease Prevention and Control Center, Guiyang 550001, China;
    3. Guizhou Grassland Technology Test and Extension Station, Guiyang 550001, China;
    4. Agricultural and Rural Bureau of Qianxinan Prefecture, Xingyi 562400, China
  • Received:2023-09-13 Published:2024-02-27

Abstract: 【Objective】 The experiment was conducted to explore single nucleotide polymorphisms (SNP) of matrix metallopeptidase 2 (MMP2) gene and its correlation with reproductive traits,and to screen genetic markers related to reproductive traits of Kele pigs.【Method】 A total of 212 healthy partriparous Kele sows were selected and the SNP of MMP2 gene were screened by direct sequencing.Using RNAfold online software to predict the secondary mRNA structure of different haplotypes of MMP2 gene.SPSS 22.0 software was used to analyze the correlation between MMP2 gene SNP and reproductive traits of Kele pigs.【Result】 1 SNP (g.30062403 C>T) was detected in exon 2 and 2 SNPs (g.30065309 C>T and g.30065312 C>T) were detected in exon 4 of MMP2 gene,all with 3 genotypes (CC,CT and CT).The results of genetic analysis showed that g.30062403 C>T was a low polymorphism,and g.30065309 C>T and g.30065312 C>T were moderate polymorphisms.Chi-square fitness test results showed that g.30062403 C>T significantly deviated from Hardy-Weinberg equilibrium (P<0.05),and the other 2 SNPs were in Hardy-Weinberg equilibrium (P>0.05).Linkage disequilibrium analysis showed that there was strong linkage disequilibrium between g.30065309 C>T and g.30065312 C>T.The analysis of haplotype mRNA secondary structure showed that the mRNA secondary structure of haplotype H1 was the same as the original sequence,and the other 3 haplotypes all caused changes in the mRNA secondary structure and minimum free energy.The results of association analysis showed that the litter number of TT genotype at g.30062403 C>T was significantly higher than that of CC genotype,and the weaning litter weight was significantly higher than that of CT genotype (P<0.05).The number of weaned piglets of CC genotype at g.30065309 C>T was significantly higher than that of TT genotype (P<0.05). The number of live litter and weaned piglets of TT genotype at g.30065312 C>T was significantly higher than that of CT genotype (P<0.05).The diplotype H2H2 was the dominant diplotype of litter number,litter born alive,weaned piglets and weaning litter weight,while H1H4 was the dominant diplotype of litter weight at birth.【Conclusion】 There was a significant correlation between of MMP2 gene 3 SNPs and litter number,litter born alive,litter weight at birth,weaned piglets and litter weight at weaning,which could be used as genetic markers for molecular breeding.

Key words: Kele pigs; MMP2 gene; polymorphism; reproductive traits; association analysis

CLC Number: