China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (10): 3522-3532.doi: 10.16431/j.cnki.1671-7236.2021.10.003

• Biotechnology • Previous Articles     Next Articles

Cloning, Bioinformatics and Tissue Expression Analysis of Smad4 Gene in Chicken (Gallus gallus)

HUANG Zhengyang1,2, WANG Qianbao1,2, LI Chunmiao1,2, HUANG Huayun1,2, LIANG Zhong1, MU Chunyu1, LI Shoufeng1, ZHAO Zhenhua1,2   

  1. 1. Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou 225125, China;
    2. Key Laboratory for Poultry Genetics and Breeding of Jiangsu Province, Yangzhou 225125, China
  • Received:2021-03-26 Online:2021-10-20 Published:2021-09-30

Abstract: The purpose of this study was to clone Smad4 gene and analyze its bioinformatics and tissue expression in chicken. Suqin No. 3 chicken was selected as experimental subjects, the full-length sequence of Smad4 gene in chicken was amplified by Race technology and cloned, the bioinformatics analysis of Smad4 gene was carried out, and the phylogenetic tree was constructed. The expression of Smad4 gene in chicken tissues was detected by Real-time quantitative PCR. The results showed that a full-length of Smad4 gene in chicken was obtained, which contained 17 bp 5'UTR, 1 842 bp open reading frame and 466 bp 3'UTR. There were 11 exons and 10 introns, the length of mRNA was 2 325 bp, which encoded 613 amino acids. The phylogenetic tree showed that Smad4 gene in chicken was clustered with other birds. Bioinformatics analysis showed that the molecular mass of Smad4 protein was 65.43 ku, the theoretical isoelectric point was 10.04, it was a hydrophilic protein. Smad4 protein contained two conserved domains MH1 and MH2. The secondary structure was consist of alpha helix (18.11%), extended chain (17.29%) and random coil (64.60%). Tissue expression analysis showed that Smad4 gene was highly expressed in heart, liver, jejunum and ovary, but there was no expression in breast muscle. In this study, the full-length sequence of Smad4 gene in chicken was successfully obtained, and its tissue expression pattern was preliminarily studied, which provided a theoretical basis for further study on the molecular mechanism of Smad4 gene in reproductive activity of chicken.

Key words: chicken; Smad4 gene; cloning; expression analysis

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