China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (2): 587-597.doi: 10.16431/j.cnki.1671-7236.2022.02.020

• Genetics and Breeding • Previous Articles     Next Articles

Correlation Analysis of BMPRⅡ Gene Polymorphism and Its Haplotype with Lambing Traits in Tibetan Sheep

LI Mingming, WU Qingwei, DENG Yuting, JIN Shengwei, HE Na, ZHANG Junxia   

  1. College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China
  • Received:2021-08-31 Online:2022-02-05 Published:2022-01-27

Abstract: 【Objective】 The aim of this study was to investigate the relationship between the polymorphism of bone morphogenetic protein receptor Ⅱ (BMPRⅡ) gene and its haplotype lambing traits of Tibetan sheep.【Method】 433 Tibetan ewes were used to detect the polymorphisms of 9 single nucleotide polymorphisms (SNPs) of BMPRⅡ gene in Tibetan sheep population by improved multiple ligase detection reaction (iMLDR).Haploview 4.2 software was used to analyze the linkage disequilibrium and construct haplotypes.Gene association analysis was used to explore the association between BMPRⅡ gene polymorphism and haplotype and lambing traits of Tibetan sheep.【Result】 The results showed that there were g.90192 T>C, g.142532 C>T, g.142614 A>G, g.142751 T>C, g.143138 A>G and g.143189 G>A in exon 12 of BMPRⅡ gene in Tibetan sheep, and there were one mutation site each in exons 3, 9 and 13, g.143570 C>G, g.124843 A>C and g.145233 A>G, respectively.All the 9 SNPs were synonymous mutations.Among the 9 SNPs, there were 3 genotypes except g.90192 T>C.Polymorphism information content analysis showed that the population was low polymorphic at g.90192 T>C, g.142614 A>G and g.145233 A>G (PIC < 0.25).g.124843 A>C, g.142532 C>T, g.142751 T>C, g.143138 A>G, g.143189 G>A and g.143570 C>G were all moderately polymorphic (0.25 < PIC < 0.5).The results of Chi-square fitness test showed that all mutation sites did not deviate from Hardy-Weinberg equilibrium state.Correlation analysis showed that there was no significant correlation between different genotypes at different SNPs and lambing traits of Tibetan sheep (P > 0.05), but the average lambing number of CT genotype at g.142532 C>T was higher than CC and TT genotypes, the average lambing number of CC genotype at g.142751 T>C was higher than TT and TC genotypes, and the average lambing number of GA genotype at g.143189 G>A was higher than GG and AA genotypes, the average lambing number of CG genotype at 143570 C>G was higher than that of CC and GG genotypes, and the average lambing number of GG genotype at g.145233 A>G was higher than that of AA and AG genotypes, and these differences were not significant (P>0.05).8 SNPs in BMPRⅡ gene except for g.90192 T>C formed 14 haplotypes (H1-H14) in Tibetan sheep, and there was no significant correlation between haplotypes and lamb number (P > 0.05).【Conclusion】 BMPRⅡ gene g.142532 C>T, g.142751 T>C, g.143189 G>A, g.143570 C>G and g.145233 A>G might have some potential effects on the number of lambing in Tibetan sheep.

Key words: Tibetan sheep; BMPRⅡ gene; single nucleotide polymorphism; haplotype; litter size

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