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Cheng L.-F.,Fujian Academy of Agricultural science | Cheng L.-F.,Fujian Animal Diseases Control Technology Development Center | Chen H.-M.,Fujian Academy of Agricultural science | Chen H.-M.,Fujian Animal Diseases Control Technology Development Center | And 9 more authors.
Avian Diseases

A virulent Riemerella anatipestifer bacteriophage, RAP44, belonging to the Siphoviridae family of tailed phages, was previously isolated from feces of healthy Muscovy ducks in China. A complete genomic sequence analysis indicates that the phage's genome consists of a linear, double-stranded DNA molecule of 49,329 nucleotides. Eighty open reading frames (ORF) were identified. Putative functions could be assigned to 24 of the ORFs. The location of these genes was consistent with organization of the genome in a modular format which includes modules for host cell lysis, tail morphogenesis, head morphogenesis, and DNA replication and modification modules. Until now, no R. anatipestifer phage genome sequence has been reported in the literature. Therefore, this study represents the first complete genomic and molecular description of the R. anatipestifer phage. © American Association of Avian Pathologists. Source

Wang S.,Fujian Academy of Agriculture Science | Wang S.,Fujian Animal Diseases Control Technology Development Center | Cheng X.,Fujian Academy of Agriculture Science | Cheng X.,Fujian Animal Diseases Control Technology Development Center | And 8 more authors.
Archives of Virology

To investigate the possible role of recombination in the evolution of Muscovy duck parvovirus (MDPV) and goose parvovirus (GPV) in Taiwan, we analyzed a potentially significant recombination event that occurred only in GPV by comparing thirteen complete sequences of the capsid gene VP2 of GPV and MDPV. The recombination event occurred between GPV strain 06-0239 as the minor parent and strains 99-0808 as the major parent, which resulted in the GPV recombinant V325/TW03. GPV V325/TW03 is likely to represent a new genotype among the Taiwanese GPV strains. This represents the first evidence that intergenotype recombination within the VP2 gene cluster contributes to the genetic diversity of the VP2 genes of Taiwanese GPV field strains. © 2015, Springer-Verlag Wien. Source

Fu G.,Fujian Academy of Agricultural science | Fu G.,Fujian Animal Diseases Control Technology Development Center | Shi S.,Fujian Academy of Agricultural science | Shi S.,Fujian Animal Diseases Control Technology Development Center | And 13 more authors.
Avian Diseases

To investigate the genetic diversity and genotype of duck circovirus (DuCV), nine full-length DuCV genomes were determined from clinical samples. Multiple sequence alignment and phylogenetic analyses were performed on the nine viral genome sequences as well as on 27 genome sequences retrieved from the GenBank database. Pairwise analysis showed that the determined genome sequences have a genome organization identical to the 27 sequences and share 83.3%-99.8% identity among themselves and 82.6%-99.9% with the other 27 sequences. Phylogenetic analysis revealed that all 36 viral genome sequences are divided into two lineages, DuCV1 and DuCV2, in which the nucleotide diversity between genome sequences in these two lineages ranged from 13.2%-17.4%; these may be regarded as two types of viruses. Viruses under DuCV1 and DuCV2 are further clustered into different sublineages. When analyzed using the method for genotype definition proposed by Grau-Roma et al., these different sublineages can be defined as genotypes DuCV1a, DuCV1b, DuCV2a, DuCV2b, and DuCV2c. In addition, the viral sequences obtained from mainland China are different in genomic size and share a diversity of no less than 13.2%, including the sequences that came from all genotypes. This suggests that the DuCVs prevalent in domestic duck flocks in China are ecologically divergent. © American Association of Avian Pathologists. Source

Wang S.,Fujian Academy of Agriculture Science | Wang S.,Fujian Animal Diseases Control Technology Development Center | Cheng X.-X.,Fujian Academy of Agriculture Science | Cheng X.-X.,Fujian Animal Diseases Control Technology Development Center | And 14 more authors.

To determine the origin and evolution of goose parvovirus (GPV) and Muscovy duck parvovirus (MDPV) in the Mainland of China, phylogenetic and recombination analyses in the present study were performed on 32 complete VP1 gene sequences from China and other countries. Based on the phylogenetic analysis of the VP1 gene, GPV strains studied here from Mainland China (PRC) could be divided into three genotypes, namely PRC-I, PRC-II and PRC-III. Genotype PRC-I is indigenous to Mainland China. Only one GPV strain from Northeast China was of Genotype PRC-II and was thought to be imported from Europe. Genotype PRC-III, which was the most isolated genotype during 1999-2012, is related to GPVs in Taiwan and has been the predominant pathogen responsible for recent Derzy's disease outbreaks in Mainland China. Current vaccine strains used in Mainland China belong to Genotype PRC-I that is evolutionary distant from Genotypes PRC-II and PRC-III. In comparison, MDPV strains herein from Mainland China are clustered in a single group which is closely related to Taiwanese MDPV strains, and the full-length sequences of the VP1 gene of China MDPVs are phylogenetic closely related to the VP1 sequence of a Hungarian MDPV strain. Moreover, We also found that homologous recombination within VP1 gene plays a role in generating genetic diversity in GPV evolution. The GPV GDFSh from Guangdong Province appears to be the evolutionary product of a recombination event between parental GPV strains GD and B, while the major parent B proved to be a reference strain for virulent European GPVs. Our findings provide valuable information on waterfowl parvoviral evolution in Mainland China. © 2015 Elsevier B.V. Source

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