›› 2019, Vol. 46 ›› Issue (8): 2406-2414.doi: 10.16431/j.cnki.1671-7236.2019.08.026

• Genetics and Breeding • Previous Articles     Next Articles

Polymorphism and Bioinformatics Analysis of Tβ4 Gene in Qianbei Ma Goat

LUO Zheng1,2, WENG Jimei1,2, AI Jinxin1,2, LONG Anju1,2, LUO Weixing1,2, CAI Huifen1,2   

  1. 1. Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region, Ministry of Education, Guizhou University, Guiyang 550025, China;
    2. Guizhou Province Key Laboratory of Animal Genetics, Breeding and Reproduction, College of Animal Science, Guizhou University, Guiyang 550025, China
  • Received:2018-11-25 Online:2019-08-20 Published:2019-08-17

Abstract:

This study was aimed to screen the polymorphism of thymosin beta 4 (Tβ4) gene in Qianbei Ma goat, and analyze the genetic structure by bioinformatic method.Primers were designed according to predicted sequence of Capra hircus Tβ4 gene in GenBank (accession No.:NC_030810 and NW_017189516) by Primer Premier 5.0.The mixed DNA pool and PCR products combined with direct sequencing were used to obtain the polymorphisms of exons 1, 2 and 3 in chromosome X and exon 1 in chromosome 3 of Tβ4 gene.The homology, phylogenetic tree, physicochemical properties, hydrophobicity, coiled coil, transmembrane structure, signal peptide, subcelluar localization, structure domain, phosphorylation site, glycosylation site, secondary structure and tertiary structure of Tβ4 gene in Qianbei Ma goat were analyzed using bioinformatic analysis softwares.The results showed that a total of 10 SNPs (G55C, C82T, G112A, C129T, G216A, G431A, G551T, T579A, A609G and A619G) were screened.The homology analysis results showed that the identity of Tβ4 gene between Qianbei Ma goat and Bos taurus, Equus caballus, Sus scrofa, Homo sapiens, Heterocephalus glaber, Rattus norvegicus, Mus musculus and Gallus gallus were 97.8%, 96.3%, 95.6%, 94.1%, 94.8%, 91.1%, 92.6% and 86.7%, respectively.Protein physical and chemical properties analysis showed that the theoretical isoelectric point of Tβ4 protein was about 5.02, the minimum value of hydrophilicity was -3.011, no hydrophobic amino acid and coiled coil existed, which was not a transmembrane protein and no signal peptide existed, was located in the nucleus (60.9%), mitochondria (4.3%), cytoskeleton (17.4%) and cytoplasm (17.4%).There was 1 THY domain, 1 threonine phosphorylation site, no N-glycosylation site and 4 O-glycosylation sites.The analysis of secondary structure showed that C129T mutation in Qianbei Ma goat made the increase of α-helix and the decrease of random coil.This results indicated that the polymorphism of Tβ4 gene in Qianbei Ma goat was successfully screened, which provided a theoretical foundation for the study of molecular genetic marker-assisted selection in breeding of Qianbei Ma goat.

Key words: Qianbei Ma goat; Tβ4 gene; bioinformatics

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