Novel genotype definition and genome characteristics of duck circovirus in central and Eastern China.

Transboundary and Emerging Diseases
Jun JiQingmei Xie

Abstract

To explore genetic variations in duck circovirus (DuCV) and the molecular epidemiology of its infection, tissue samples were collected from 219 dead ducks from 20 farms in the central and eastern regions of China. All farms tested positive for DuCV, with duck-origin goose parvovirus, reovirus and Tembusu virus having co-infection rates of 100%, 0% and 0%, respectively. A total of 20 strains from the DuCV-positive flock were sequenced. The total sequence length was 1987-1996 nt, and the sequences shared 82% (JX499186, DuCV2 from Sichuan province, China) to 99.7% (KY328304, DuCV1 from Shandong Province, China) sequence identity with DuCV sequences available in GenBank. Hyper-variable regions were mainly located in open reading frame (ORF)2, ORF3 and intergenic regions. The tertiary structure of ORF2 from four provinces (Henan, Anhui, Zhejiang and Fujian) in China showed a canonical viral jelly roll and the antigenic epitope of ORF2 located in the bulge of the protein surface. Overall, 15 of the 20 DuCV strains are possibly derived through inter-genotypic and intragenotypic recombination. Based on sequence and phylogenetic analyses, six strains from Fujian Province clustered into a novel genotype-DuCV-1d. These findings may enrich...Continue Reading

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Citations

Jun 7, 2021·Comparative Immunology, Microbiology and Infectious Diseases·Yong WangTianhong Zhou

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