alexa The type VI secretion system of Vibrio cholerae fosters horizontal gene transfer.
Microbiology

Microbiology

Journal of Antivirals & Antiretrovirals

Author(s): Borgeaud S, Metzger LC, Scrignari T, Blokesch M

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Abstract Natural competence for transformation is a common mode of horizontal gene transfer and contributes to bacterial evolution. Transformation occurs through the uptake of external DNA and its integration into the genome. Here we show that the type VI secretion system (T6SS), which serves as a predatory killing device, is part of the competence regulon in the naturally transformable pathogen Vibrio cholerae. The T6SS-encoding gene cluster is under the positive control of the competence regulators TfoX and QstR and is induced by growth on chitinous surfaces. Live-cell imaging revealed that deliberate killing of nonimmune cells via competence-mediated induction of T6SS releases DNA and makes it accessible for horizontal gene transfer in V. cholerae. Copyright © 2015, American Association for the Advancement of Science. This article was published in Science and referenced in Journal of Antivirals & Antiretrovirals

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