›› 2016, Vol. 43 ›› Issue (2): 377-382.doi: 10.16431/j.cnki.1671-7236.2016.02.013

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Cloning and Sequence Analysis of M Gene of Avian Infectious Bronchitis Virus Guangxi Strain

QU Su-jie, SHI Kai-chuang, ZOU Lian-bin, HU Jie, MO Sheng-lan, YIN Yan-wen, ZHANG Bu-xian, LI Jun, LIANG Yuan   

  1. Guangxi Center for Animal Disease Control and Prevention, Nanning 530001, China
  • Received:2015-06-12 Online:2016-02-20 Published:2016-03-02

Abstract: According to the M gene nucleotide sequence of avian infectious bronchitis virus (IBV) published in GenBank,one pair of primers were designed,the M gene fragments of IBV isolated from Guangxi province were amplified by PCR.Then the amplified fragments were cloned into pMD18-T vector and the positive recombinant plasmids were sequenced.The results showed that M gene from all of the IBV isolates consisted of 678 bp,coding for 225 amino acids.Two glycosylated sites were located nearby the N-terminal,three transmembrane domains were located in the 23 to 98 peptide region.Variations within the hydrophilicity region were easier than that in the hydrophobicity region.Compared with that of other published IBV strains,the homologies of nucleotide and amino acid sequences of the isolates were 83.6% to 92.5% and 82.7% to 95.1%,respectively.The phylogenetic tree analysis showed that it was closely related to SAIB20 and LX4,and clustered into one group;But it belonged to different branches with other reference strains,and had a distant relationship.These results suggested that the isolate was a new variant of IBV.

Key words: avian infectious bronchitis virus; M gene; gene clone; sequence analysis

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