ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2013, Vol. 44 ›› Issue (8): 1205-1212.doi: 10.11843/j.issn.0366-6964.2013.08.005

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Associations of Polymorphisms of Promoter Region of STAT3 Gene with Growth Traits in Wuchuan Black Cattle

YANG Yong-qiang1, JIAO Ren-gang2, GONG Yu2, XIE Hai-qiang1, HUI Yan-ting1, ZHANG Yi-yu1, XIAO Chao-neng1, LIU Ruo-yu1*   

  1. (1. Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region, Ministry of Education/ Guizhou Key Laboratory of Animal Genetics, Breeding and Reproduction, College of Animal Science, Guizhou University, Guiyang 550025, China; 2. Animal Science and Technology Station of Guizhou, Guiyang 550001, China)
  • Received:2013-01-14 Online:2013-08-23 Published:2013-08-23

Abstract:

The study aimed to screen the SNPs in the promoter region of STAT3 gene in cattle and analyze the effect of SNPs on function elements of promoter and growth traits. Two cattle breeds (Wuchuan Black cattle and Guizhou Holstein cow) that possessed significant difference in breeds property were selected to construct DNA pools, SNP sites were screened by direct sequencing subsequently. PCR-RFLP was used to be genotyping and a total of 114 Wuchuan Black cattle were used to study the associations of SNPs with 8 growth traits. Results showed that 7 new single nucleotide polymorphism (SNP) sites including G-449A, C-341A, A-322G, C-246A, G-240A, C-225T and A-103T, respectively were found in the 5' flanking region of STAT3 gene and then submitted the information of SNPs to NCBI to obtain accession numbers. Furthermore, bioinformatics tools were used to predict the core region of the promoter and CpG island. SNPs found in this study led to the disappearance of a large amount of transcription factors bingding sites and the appearance of new sites, it also showed that SNP mutation didnt affect the range of CpG island dramaticlly by using various softwares. Association analysis demonstrated that A-322G had highly significant effects on body weight (P<0.01), A allele was the favorable alleles. Moreover, animals with the genotype AG had the highest mean body weight than those with GG and AA genotypes, which suggested that A-322G was an important SNP marker affecting the cattle growth performance and STAT3 gene could be applied in marker-assisted selection for improving growth performance in cattle. This work could lay the experimental foundation for the identification of function of STAT3 gene in cattle.

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