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Study on the Polymorphisms of PPAR-α Gene and its Association with Heat Shock Response in Chinese Holstein

FANG Wen-liang1,2, HUANG Jin-ming2, WANG Chang-fa2, JU Zhi-hua2, LI Jian-bin2, LI Rong-ling2, LI Lin2, ZHONG Ji-feng2, HE Jian-bin1, LI Qiu-ling2   

  1. 1. Institute of Animal Husbandry and Veterinary, Shenyang Agricultural University, Shenyang 110161, China;
    2. Research Center of Dairy Cow, Shandong Academy of Agricultral Science,Jinan 250100, China
  • Received:2012-02-09 Online:2012-08-20 Published:2012-08-24

Abstract: In this study,we detected a novel single-nucleotide polymorphism of the PPAR-α gene in Chinese native cattle by screening for genetic variation of PPAR-α in 944 individuals of three Chinese cattle breeds,namely China Holstein,Bohai Black and Luxi Yellow,using PCR-RFLP and DNA sequencing techniques. The sequencing results indicated that there was one single nucleotide mutation (G to A) in the 44087 of the PPAR-α gene. Chi-square test indicated that 44087G>T polymorphic site in the PPAR-α gene didn’t meet Hardy-Weinberg equilibrium in Holstein and Luxi cattle(P<0.05);The genetic correlations between genotypes and heat shock response were obtained by the least square analysis,and the results showed that genetic polymorphisms significantly correlated with somatic cell scores (SCS),and milk productive traits. GA genotype in 44087G>A polymorphic site in PPAR-α gene was an excellent site,SCS of the individuals were significantly lower than GG genotype (P<0.05); cows with GA genotype had a significantly higher protein levels and milk yield in the hot environment than GG genotype (P<0.05),so GA genotype was resistive heat. The resulting analysis of the GA genotype might help to improve the performance of Chinese Holstein cows milk. In the process of artificial selection,the GA genotype individuals could reduce heat stress to cows harm,and at the same time was able to improve milk quality and yield.

Key words: Chinese Holstein; SNPs; PPAR gene; polymorphism; PCR-RFLP

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