Published online 10 January 2006
Article |
Dispersal and regulation of an adaptive mutagenesis cassette in the bacteria domain
Biomedical Applications Group, Centro Nacional de Microelectrónica 08193 Bellaterra, Spain 1Centre de Recerca en Sanitat Animal (CReSA) 08193 Bellaterra, Spain 2Departament de Genètica i Microbiologia, Universitat Autònoma de Barcelona 08193 Bellaterra Spain
*To whom correspondence should be addressed at Departament de Genètica i Microbiologia, Ed. C, Universitat Autònoma de Barcelona 08193 Bellaterra, Spain. Tel: +34 93 581 1837; Fax: +34 93 581 2387; Email: jordi.barbe{at}uab.es
Received September 30, 2005. Revised December 8, 2005. Accepted December 8, 2005.
Recently, a multiple gene cassette with mutagenic translation synthesis activity was identified and shown to be under LexA regulation in several proteobacteria species. In this work, we have traced down instances of this multiple gene cassette across the bacteria domain. Phylogenetic analyses show that this cassette has undergone several reorganizations since its inception in the actinobacteria, and that it has dispersed across the bacterial domain through a combination of vertical inheritance, lateral gene transfer and duplication. In addition, our analyses show that LexA regulation of this multiple gene cassette is persistent in all the phyla in which it has been detected, and suggest that this regulation is prompted by the combined activity of two of its constituent genes: a polymerase V homolog and an alpha subunit of the DNA polymerase III.
The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors
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