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Phylodynamic Analysis Of Two Amino Acid Substitutions In The Hemagglutinin Protein Of Canine Distemper Virus Strains Detected In Fur-Bearing Animals In China

文献类型： 外文期刊

作者： Tao, RS; Ba, HX; Chen, J; Liu, MJ; Pan, HJ; Li, X; Wang, QK; Zhao, JJ

作者机构：

关键词： Canine Distemper Virus; H Protein; Sub-Genotype; Bayesian Phylogenetics; Selection Pressure

期刊名称： VIRUS GENES

ISSN： 0920-8569

年卷期： 2020 年 56 卷 1 期

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收录情况： JCR（2021版）

摘要： Canine distemper virus (CDV) causes a highly contagious disease in a wide range of carnivores. The hemagglutinin (H) protein of viruses shows the highest variability and plays an important role in modulation of viral antigenicity, virulence, and receptor recognition. Since 2012, canine distemper (CD) outbreaks in fur-bearing animals (minks, foxes, raccoon dogs) caused by CDV variants with I542N and Y549H substitutions in the H protein have been frequently reported in China. To characterize the molecular evolutionary dynamics and epidemiological dynamics of CDV, 235 H gene sequences of CDV wild-type strains collected from 22 countries between 1975 and 2015, including 44 strains predominant in fur-bearing animals in China, were analyzed. The phylogenetic relationships and evolutionary rates of the CDV strains were determined by Bayesian phylogenetics. The CDV strains clustered into distinct geographic genotypes, irrespective of the species of isolation. All the variant strains formed a distinct monophyletic cluster and belonged to the F sub-genotype within the Asia-1 genotype-currently the predominant sub-genotype in fur-bearing animals in China. Evolutionary analysis suggested that the variant strains originated in 2006. Furthermore, the selection pressure analysis revealed that the Y549H substitution was under positive selection pressure for adaptation toward the fur-bearing animals. The residue at position 549 also showed structural interaction with the V domain of the mink signaling lymphocyte-activation molecule (SLAM) receptor based on the homology modeling of the H-SLAM complex. Our results suggested that the Y549H substitution contributed to the molecular adaptation of CDV variants in the fur-bearing animals during the viral evolutionary phase in China.

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