China Animal Husbandry and Veterinary Medicine ›› 2019, Vol. 46 ›› Issue (9): 2658-2664.doi: 10.16431/j.cnki.1671-7236.2019.09.020

• Genetics and Breeding • Previous Articles     Next Articles

Polymorphisms of MDHⅠ Gene and Its Associations Analysis with Growth Traits in Yak

CHEN Lulu1,2, WANG Hui1,2, CHAI Zhixin1,2, ZHONG Jincheng1,2, WANG Jikun1,2, CHEN Zhihua1,2   

  1. 1. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Sichuan Province and Ministry of Education, Southwest Minzu University, Chengdu 610041, China;
    2. Institute of Tibetan Plateau Research, Southwest Minzu University, Chengdu 610041, China
  • Received:2018-12-29 Online:2019-09-20 Published:2019-09-21

Abstract: The aim of this study was to investigate the genetic polymorphism of MDHⅠ gene and its associations analysis with growth traits,in order to provide a reference for the breeding of qualify traits in yak.Five groups (178 total) of yak were selected,DNA were extracted from the ear samples,and DNA pools were constructed.The specific primers of all exons of MDHⅠ gene were designed for amplification and sequencing.SNPs were screened using Mega 5.2,the genotypes were identified by direct sequencing.χ2 independence detection,gene homozygosity (Ho),heterozygosity (He),effective allele frequency (Ne) and polymorphism information the content (PIC) analysis were analyzed by PopGene 32,the association between the polymorphisms of MDHⅠ gene and growth traits in yak was analyzed using SPSS 24.0.The results showed that only one mutation site in exon 8 (G23093C,synonymous mutation) was found in Shenzha,Leiwuqi,Sibu,Pali and Maiwa yaks,which was synonymous mutations.There was three genotypes of GC,CC and GG,among the five yak populations,GC genotype was the dominant genotype (GG was the dominant genotype in Leiwuqi yak),and G was the dominant allele (except for Sibu yak),the gene frequency of G and C were equal in Sibu yak.χ2 adaptability test showed that Shenzha,Leiwuqi,Sibu,Pali and Maiwa yaks were in accordance with Hardy-Weinberg equilibrium (P>0.05).MDHⅠ gene in Shenzha,Pali and Sibu yaks showed highly polymorphic (PIC>0.5),while Maiwa and Leiwuqi yaks showed moderately polymorphic (0.25 < PIC < 0.5),and the highest homozygosity was Shenzha and Leiwuqi yaks.The correlation analysis results showed that different genotypes of MDHⅠgene had significant effects on body weight in Leiwuqi,Pali and Maiwa yaks (P<0.05),and the interspecies analysis results showed that different genotypes of MDHⅠ gene had significant effects on body weight in yak (P<0.05).It indicated that MDHⅠ gene could be used as a molecular marker for artificial breeding.

Key words: yak; MDHⅠgene; polymorphism; growth traits; association analysis

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