Comparative genomics of Riemerella anatipestifer reveals genetic diversity |
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Authors: | Xiaojia Wang Wenbin Liu Dekang Zhu LinFeng Yang MaFeng Liu Sanjun Yin MingShu Wang RenYong Jia Shun Chen KunFeng Sun Anchun Cheng Xiaoyue Chen |
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Institution: | .Avian Disease Research Center, College of Veterinary Medicine of Sichuan Agricultural University, 46# Xinkang Road, Ya’an, Sichuan 625014 P.R. China ;.BGI-Shenzhen, Shenzhen, 518083 China ;.Institute of Preventive Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan 611130 P.R. China ;.Key Laboratory of Animal Disease and Human Health of Sichuan Province, Sichuan Agricultural University, Chengdu, Sichuan 611130 P. R. China |
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Abstract: | BackgroundRiemerella anatipestifer is one of the most important pathogens of ducks. However, the molecular mechanisms of R. anatipestifer infection are poorly understood. In particular, the lack of genomic information from a variety of R. anatipestifer strains has proved severely limiting.ResultsIn this study, we present the complete genomes of two R. anatipestifer strains, RA-CH-1 (2,309,519 bp, Genbank accession {"type":"entrez-nucleotide","attrs":{"text":"CP003787","term_id":"403311769","term_text":"CP003787"}}CP003787) and RA-CH-2 (2,166,321 bp, Genbank accession {"type":"entrez-nucleotide","attrs":{"text":"CP004020","term_id":"441482619","term_text":"CP004020"}}CP004020). Both strains are from isolates taken from two different sick ducks in the SiChuang province of China. A comparative genomics approach was used to identify similarities and key differences between RA-CH-1 and RA-CH-2 and the previously sequenced strain RA-GD, a clinical isolate from GuangDong, China, and ATCC11845.ConclusionThe genomes of RA-CH-2 and RA-GD were extremely similar, while RA-CH-1 was significantly different than ATCC11845. RA-CH-1 is 140,000 bp larger than the three other strains and has 16 unique gene families. Evolutionary analysis shows that RA-CH-1 and RA-CH-2 are closed and in a branch with ATCC11845, while RA-GD is located in another branch. Additionally, the detection of several iron/heme-transport related proteins and motility mechanisms will be useful in elucidating factors important in pathogenicity. This information will allow a better understanding of the phenotype of different R. anatipestifer strains and molecular mechanisms of infection. |
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Keywords: | Riemerella anatipestifer Comparative genomics Structural variation |
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