Natural transformation of Vibrio fischeri requires tfoX and tfoY.

Natural transformation of Vibrio fischeri requires tfoX and tfoY.
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DOI:
10.1111/j.1462-2920.2010.02250.x
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发表时间:
2010-08
影响因子:
5.1
通讯作者:
Ruby EG
Ruby EG
中科院分区:
生物学2区
文献类型:
--
作者:
Pollack-Berti A;Wollenberg MS;Ruby EG

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最近的证据表明,自然遗传转化发生在霍乱弧菌中,它需要几丁质低聚糖(如壳己糖)的诱导和一种被认为是调节基因tfoX的表达。利用序列和系统发育分析,我们在弧菌属的所有测序基因组中发现了两个tfoX同源物。像霍乱弧菌一样,当在壳聚糖中生长时,费氏弧菌的细胞能够吸收并结合外源DNA。当tfoX在多拷贝中存在时,观察到V. fischeri的壳己糖非依赖性转化。在V. fischeri中,第二个tfoX对话称为tfoY,也是有效转换所必需的,但在功能上与tfoX不相同。fischeri弧菌的自然转化促进了突变在菌株间的快速转移,并为该物种的实验遗传操作提供了非常有用的工具。几丁质诱导的能力在几种弧菌中的存在,突出了这种环境重要海洋细菌家族之间遗传交换的保守机制的潜力。
Recent evidence has indicated that natural genetic transformation occurs in Vibrio cholerae, and that it requires both induction by chitin oligosaccharides, like chitohexaose, and expression of a putative regulatory gene designated tfoX. Using sequence and phylogenetic analyses we have found two tfoX paralogues in all sequenced genomes of the genus Vibrio. Like V. cholerae, when grown in chitohexaose, cells of V. fischeri are able to take up and incorporate exogenous DNA. Chitohexaose-independent transformation by V. fischeri was observed when tfoX was present in multi-copy. The second tfoX paralogue, designated tfoY, is also required for efficient transformation in V. fischeri, but is not functionally identical to tfoX. Natural transformation of V. fischeri facilitates rapid transfer of mutations across strains, and provides a highly useful tool for experimental genetic manipulation in this species. The presence of chitin-induced competence in several vibrios highlights the potential for a conserved mechanism of genetic exchange across this family of environmentally important marine bacteria.
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