ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (1): 60-68.doi: 10.11843/j.issn.0366-6964.2015.01.008

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Confirming the Genetic Effects of Bovine TRAPPC9 on Milk Production Traits Based on Post-GWAS Strategies

DONG Yi-chun,LIU Chao,WANG Xiao,WANG Ya-chun,ZHANG Yi,SUN Dong-xiao,ZHANG Sheng-li,ZHANG Qin,ZHANG Yuan,YU Ying*   

  1. (College of Animal Science and Technology,China Agricultural University,Beijing 100193,China)
  • Received:2014-04-28 Online:2015-01-23 Published:2015-01-23

Abstract:

Based on the result of the previous genome-wide association study(GWAS) for milk production traits in Beijing Chinese Holstein population,trafficking protein particle complex 9(TRAPPC9) as a novel candidate gene for milk production traits was confirmed in new Chinese Holstein population.Promoter,exon and GWAS’s significant region was amplified and sequenced by screening the DNA pools to select single nucleotide polymorphisms(SNP) and analyze their association with milk production traits of Chinese Holstein population.The association analysis showed that the genotypes of SNP1 had significant effect on protein percentage(PP) and lactose percentge(LP)(P<0.01);the genotypes of SNP2 had significant effect on PP and LP(P<0.05);the genotypes of SNP3 had significant effect on fat percent(FP) and PP(P<0.01);the genotypes of SNP4 had significant effect on FP(P<0.01);the genotypes of SNP5 had significant effect on FP and LP(P<0.05).The expression of TRAPPC9 also had significant effect on milk production traits,but the DNA methylation of promoter region of TRAPPC9 had no direct effect.In conclusion,TRAPPC9 gene can be considered as a molecular marker applied to Chinese Holstein marker-assisted selection.

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