Novel insights into the pathogenicity of epidemic Aeromonas hydrophila ST251 clones from comparative genomics.

Novel insights into the pathogenicity of epidemic Aeromonas hydrophila ST251 clones from comparative genomics.
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从比较基因组学角度对流行性嗜水气单胞菌 ST251 克隆致病性的新见解

DOI:
10.1038/srep09833
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发表时间:
2015-05-27
期刊:
影响因子:
4.6
通讯作者:
Liu Y
Liu Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Pang M;Jiang J;Xie X;Wu Y;Dong Y;Kwok AH;Zhang W;Yao H;Lu C;Leung FC;Liu Y

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由嗜水气单胞菌引起的鱼类运动性气单胞菌败血症(MAS)在世界范围内引起了广泛关注。在此,我们首次提供了两个在中国分离的流行性嗜水单胞菌的完整基因组。为了深入了解流行性嗜水单胞菌的致病性,我们对序列型(ST) 251的5株流行菌株和环境菌株ATCC 7966T进行了比较基因组分析。我们发现,已知的毒力因子,包括III型分泌系统、VI型分泌系统和侧鞭毛,并不是ST251克隆群高毒力所必需的。此外,我们的工作确定了肌醇、唾液酸和L- focus的三种利用途径,为ST251嗜水单胞菌的流行和毒性提供了线索。基于ST251克隆群的地理分布和生物资源,我们认为ST251克隆群是嗜水单胞菌的高危克隆群,可能是导致中国和美国东南部MAS暴发的原因。
Outbreaks in fish of motile Aeromonad septicemia (MAS) caused by Aeromonas hydrophila have caused a great concern worldwide. Here, for the first time, we provide two complete genomes of epidemic A. hydrophila strains isolated in China. To gain an insight into the pathogenicity of epidemic A. hydrophila, we performed comparative genomic analyses of five epidemic strains belonging to sequence type (ST) 251, together with the environmental strain ATCC 7966T. We found that the known virulence factors, including a type III secretion system, a type VI secretion system and lateral flagella, are not required for the high virulence of the ST251 clonal group. Additionally, our work identifies three utilization pathways for myo-inositol, sialic acid and L-fucose providing clues regarding the factors that underlie the epidemic and virulent nature of ST251 A. hydrophila. Based on the geographical distribution and biological resources of the ST251 clonal group, we conclude that ST251 is a high-risk clonal group of A. hydrophila which may be responsible for the MAS outbreaks in China and the southeastern United States.
DOI: 10.1128/iai.66.5.1813-1821.1998
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