Association Analysis ofPAEP,KRT10 andBMP7 Genes SNPs with Reproductive Traits in Kele Pigs

The aims of this study were to investigate the effects of single nucleotide polymorphisms (SNPs) in progestogen-associated endometrial protein ( PAEP ), keratin 10 ( KRT 10), and bone morphogenetic protein 7 ( BMP 7) genes on reproductive traits (total number of piglets born, number of piglets born alive, litter birth weight, number of piglets weaned and litter weight weaned) in Kele pigs. We used a total of 255 multiparous Kele sow (2-4 parities) as research materials. SNPs were identified by PCR amplification instrument and sequence alignment software DANMAN. The population genetic characteristics of SNPs were analyzed using the SHEsis online software. Bioinformatics analysis of SNPs were conducted using RNAfold, SOPMA, SWISS-MODEL, and Swiss-PdbViewer programs. The associations between the SNPs and reproductive traits in Kele pigs were analyzed through SPSS 22.0 software. In this study, nine SNPs were identified in the three genes: g.1884992 T>C (exon 4), g.1885152 G>C (intron 4) and g.1887834 G>A (intron 4) in PAEP , g.21643703 C>T (intron 4), g.21643714 G>A (intron 4) and g.21643741 G>A (exon 5) in KRT 10, and g.57647887 G>A (intron 3), g.57647990 C>T (intron 3) and g.57648145 C>G (intron 3) in BMP 7. In SNPs g.1884992 T>C of PAEP, missense mutation eventuated structural changes in mRNA and proteins secondary structure. In SNPs g.21643741 G>A of KRT 10, synonymous mutation led to alteration in mRNA secondary structure. For PAEP, the CC genotype in SNPs g.1885152 G>C and the AA genotype in SNPs g.1887834 G>A showed significantly higher values than other genotypes in all reproduction traits except for litter birth weight, preliminarily identified as favorable genotypes. For KRT 10, the GG genotype in SNPs g.21648641 G>A showed significant superiority than AA genotype ( P< 0.05) in all aspects except for litter birth weight, and notably surpassed the GA genotype in total number of piglets born ( PA and the CT genotype in SNPs g.57647990 C>T exhibited significantly higher number of piglets born alive and number of piglets born alive compared to other genotypes ( PG was significantly associated with higher litter birth weight ( P< 0.05). The result of diplotype analyses indicated that the H3H3 (CCGGGG) of PAEP and H3H3 (CCGGAA) of KRT 10 had a significant effect on the five traits. For BMP 7, the H4H4 (AATTGG) diplotype showed a significant influence on all genotypes except litter birth weight.