›› 2018, Vol. 45 ›› Issue (8): 2057-2066.doi: 10.16431/j.cnki.1671-7236.2018.08.003

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Molecular Characteristics and Cluster of PPRV Guizhou Strains Based on N Gene

WANG Jun1,2, YANG Yuan1,2, ZHANG Yundan1,2, WEN Ming1,2, ZHOU Bijun1,2, CHENG Zhentao1,2, YUN Jun3, LI Tao3   

  1. 1. College of Animal Science, Guizhou University, Guiyang 550025, China;
    2. Key Laboratory of Animal Health and Veterinary Public Health, Guizhou Province, Guiyang 550025, China;
    3. Guizhou Animal Disease Prevention and Control Center, Guiyang 550008, China
  • Received:2018-01-17 Online:2018-08-20 Published:2018-08-15

Abstract:

In order to investigate the N gene molecular characteristics and clustering of the peste des petits ruminants virus (PPRV) of Guizhou province,the primers of PPRV N gene were designed and the target gene was amplified from clinical samples and then was cloned to pMD19-T vector.The positive recombinant plasmids were sequenced and nucleotide homologoy, amino acids homology,mutation sites and phylogenetic tree analysis of N gene of Guizhou PPRV strains and reference strains were performed by DANStar software.The results showed that the length of amplified N gene was 1 578 bp and the homology of nucleotide and amino acid sequences among Guizhou PPRV strains were 99.6% to 100.0% and 99.2% to 100.0%,respectively.The homology of nucleotide (97.7% to 99.9%) and amino acids (98.3% to 100.0%) compared with domestic reference strains were higher than those of other countries (88.5% to 97.7% and 92.2% to 98.5%).Compared with the vaccine strain Nigeria 75-1,there were 26 multiple sites in N gene of Guizhou PPRV strains while there was no amino acid loss or increase.The results of phylogenetic analysis showed that Guizhou PPRV strains were in the same evolutionary branch with the domestic reference strains,while the foreign reference strains in a different evolutionary branch.Guizhou PPRV strains belonged to Ⅳ gene group and vaccine strain Nigeria 75-1 belonged to Ⅰ gene group.

Key words: peste des petits ruminants virus (PPRV); N gene; sequence analysis; gene grouping

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