Sequence polymorphisms of rfbT among the Vibrio cholerae O1 strains in the Ogawa and Inaba serotype shifts.

Sequence polymorphisms of rfbT among the Vibrio cholerae O1 strains in the Ogawa and Inaba serotype shifts.
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小川型和稻叶型霍乱弧菌 O1 株中 rfbT 序列多态性

DOI:
10.1186/1471-2180-13-173
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发表时间:
2013-07-26
期刊:
影响因子:
4.2
通讯作者:
Kan B
Kan B
中科院分区:
生物学3区
文献类型:
--
作者:
Liang W;Wang L;Liang P;Zheng X;Zhou H;Zhang J;Zhang L;Kan B

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背景 霍乱弧菌O1血清群有小川型和稻叶型两种主要血清型,在霍乱流行期间可能交替出现。 rfbT 基因负责两种血清型之间的转换。在这项研究中,我们调查了中国小川株和稻叶株在 48 年(1961 年至 2008 年)期间的 rfbT 序列变异,其中流行年份之间发生了血清型转变。 结果 在 Inaba 菌株的 rfbT 基因中发现了各种突变事件,包括单核苷酸、短片段插入/缺失和转座酶插入。异位引入完整的 rfbT 可以通过将 Inaba 血清型转化为 Okawa 血清型来克服突变,这表明这些突变对 RfbT 功能的影响。在 Inaba 血清型显性流行年份中的 Inaba 菌株中发现了特征性 rfbT 突变,该流行年份与 Okawa 显性流行分开。经典菌株和 El Tor 生物型菌株之间的 rfbT 中三个可区分的突变位点被鉴定出来,并且可以作为生物型特异性生物标志物。 结论 我们的研究结果提供了霍乱弧菌O1菌株在不同流行时期的rfbT基因突变的全面信息,可进一步用作流行菌株克隆性分析和传播监测的追踪标记。
Background Vibrio cholerae serogroup O1 has two major serotypes, Ogawa and Inaba, which may alternate among cholera epidemics. The rfbT gene is responsible for the conversion between the two serotypes. In this study, we surveyed the sequence variance of rfbT in the Ogawa and Inaba strains in China over a 48-year (1961-2008) period in which serotype shifts occurred among epidemic years. Results Various mutation events including single nucleotide, short fragment insertions/deletions and transposases insertions, were found in the rfbT gene of the Inaba strains. Ectopically introducing an intact rfbT could overcome the mutations by converting the Inaba serotype to the Ogawa serotype, suggesting the effects of these mutations on the function of RfbT. Characteristic rfbT mutations were recognized in the Inaba strains among Inaba serotype dominant epidemic years which were separate from the Ogawa dominant epidemics. Three distinguishable mutation sites in rfbT between the classical and the El Tor biotype strains were identified and could serve as biotype-specific biomarkers. Conclusions Our results provide a comprehensive picture of the rfbT gene mutations among the V. cholerae O1 strains in different epidemic periods, which could be further used as the tracing markers in clonality analysis and dissemination surveillance of the epidemic strains.
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发表时间: 2012
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