title: Genetic characterization of an isolate of canine distemper virus from a Tibetan Mastiff in China.
abstract: Canine distemper (CD) is a highly contagious, often fatal, multisystemic, and incurable disease in dogs and other carnivores, which is caused by canine distemper virus (CDV). Although vaccines have been used as the principal means of controlling the disease, CD has been reported in vaccinated animals. The hemoagglutinin (H) protein is one of the most important antigens for inducing protective immunity against CD, and antigenic variation of recent CDV strains may explain vaccination failure. In this study, a new CDV isolate (TM-CC) was obtained from a Tibetan Mastiff that died of distemper, and its genome was characterized. Phylogenetic analysis of the H gene revealed that the CDV-TM-CC strain is unique among 20 other CDV strains and can be classified into the Asia-1 group with the Chinese strains, Hebei and HLJ1-06, and the Japanese strain, CYN07-hV. The H gene of CDV-TM-CC shows low identity (90.4 % nt and 88.9 % aa) with the H gene of the classical Onderstepoort vaccine strain, which may explain the inability of the Tibetan Mastiff to mount a protective immune response. We also performed a comprehensive phylogenetic analysis of the N, P, and F protein sequences, as well as potential N-glycosylation sites and cysteine residues. This analysis shows that an N-glycosylation site at aa 108-110 within the F protein of CDV-TM-CC is specific for the wild-type strains (5804P, A75/17, and 164071) and the Asia-1 group strains, and may be another important factor for the poor immune response. These results provide important information for the design of CD vaccines in the China region and elsewhere.
authors.affiliation: Wildlife Resources College, Northeast Forestry University, Harbin, 150040, China, weikeduo0535@163.com.
authors.forename: Weike
authors.initials: W
authors.lastname: Li
authors.forename: Tiansong
authors.initials: T
authors.lastname: Li
authors.forename: Yuxiu
authors.initials: Y
authors.lastname: Liu
authors.forename: Yuwei
authors.initials: Y
authors.lastname: Gao
authors.forename: Songtao
authors.initials: S
authors.lastname: Yang
authors.forename: Na
authors.initials: N
authors.lastname: Feng
authors.forename: Heting
authors.initials: H
authors.lastname: Sun
authors.forename: Shengle
authors.initials: S
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Zhigao
authors.initials: Z
authors.lastname: Bu
authors.forename: Xianzhu
authors.initials: X
authors.lastname: Xia
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002681:China; D016000:Cluster Analysis; D004216:Distemper / Q000821:virology*; D004217:Distemper Virus, Canine / Q000235:genetics* / Q000302:isolation & purification*; D004285:Dogs; D005838:Genotype; D006031:Glycosylation; D008969:Molecular Sequence Data; D010802:Phylogeny; D012328:RNA Viruses / Q000235:genetics* / Q000302:isolation & purification; D012367:RNA, Viral / Q000235:genetics; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014764:Viral Proteins / Q000235:genetics*
chemical_list: D012367:RNA, Viral; D014764:Viral Proteins