GI-type T4SS-mediated horizontal transfer of the 89K pathogenicity island in epidemic Streptococcus suis serotype 2.

GI-type T4SS-mediated horizontal transfer of the 89K pathogenicity island in epidemic Streptococcus suis serotype 2.
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流行性猪链球菌血清型 2 中 GI 型 T4SS 介导的 89K 致病岛水平转移

DOI:
10.1111/j.1365-2958.2011.07553.x
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发表时间:
2011-03
影响因子:
3.6
通讯作者:
Gao GF
Gao GF
中科院分区:
生物学2区
文献类型:
--
作者:
Li M;Shen X;Yan J;Han H;Zheng B;Liu D;Cheng H;Zhao Y;Rao X;Wang C;Tang J;Hu F;Gao GF

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致病性岛(PAI)是一种独特类型的基因组岛(GI),在病原体的快速适应和毒力增强中发挥着重要作用。 89K是流行性猪链球菌分离株中新发现的PAI,该菌株与中国最近两次大规模人类感染暴发有关。然而,其进化机制以及对猪链球菌2型流行病传播的贡献仍不清楚。在本研究中,评估了 89K 动员的潜力,并研究了其假定的转移机制。我们报道89K可以自发切除形成染色体外环状产物。精确切除是由 89K 携带的整合酶在切除酶的帮助下通过位点特异性重组介导的。 89K 切除中间体作为横向转移至非 89K S. suis 2 受体的底物,在其中特异性地重新整合到目标位点中。 89K 的接合转移通过 89K 编码的 GI IV 型分泌系统 (T4SS) 发生,每个供体的频率为 10−6 个接合子。这是首次证明由 GI 型 T4SS 介导的革兰氏阳性 PAI 水平转移。我们认为这些遗传事件对于流行性猪链球菌 2 株的出现、发病机制和持续存在很重要。
Pathogenicity islands (PAIs), a distinct type of genomic island (GI), play important roles in the rapid adaptation and increased virulence of pathogens. 89K is a newly identified PAI in epidemic Streptococcus suis isolates that are related to the two recent large‐scale outbreaks of human infection in China. However, its mechanism of evolution and contribution to the epidemic spread of S. suis 2 remain unknown. In this study, the potential for mobilization of 89K was evaluated, and its putative transfer mechanism was investigated. We report that 89K can spontaneously excise to form an extrachromosomal circular product. The precise excision is mediated by an 89K‐borne integrase through site‐specific recombination, with help from an excisionase. The 89K excision intermediate acts as a substrate for lateral transfer to non‐89K S. suis 2 recipients, where it reintegrates site‐specifically into the target site. The conjugal transfer of 89K occurred via a GI type IV secretion system (T4SS) encoded in 89K, at a frequency of 10−6 transconjugants per donor. This is the first demonstration of horizontal transfer of a Gram‐positive PAI mediated by a GI‐type T4SS. We propose that these genetic events are important in the emergence, pathogenesis and persistence of epidemic S. suis 2 strains.
DOI: 10.1371/journal.pone.0000315
发表时间: 2007-03-21
期刊: PloS one
影响因子: 3.7
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影响因子: 11.1
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影响因子: 11.3
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