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Differences in LexA regulon structure among Proteobacteria through in vivo assisted comparative genomics
Ivan Erill1, Mónica Jara, Noelia Salvador
1Biomedical Applications Group, Centro Nacional de Microelectrónica, 08193 Bellaterra, Spain.
Nucleic Acids Research
|December 18, 2004
Summary
This study reveals the DNA repair gene network (LexA regulon) in Alpha Proteobacteria. A core set of genes, including recA, is essential for this bacterial DNA damage response across Proteobacteria.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Background:
- The LexA regulon is a crucial network of genes for bacterial cell survival during significant DNA damage.
- Previous studies primarily focused on the LexA regulon within Gamma Proteobacteria, leaving its scope in other bacterial classes largely unexplored.
Purpose of the Study:
- To elucidate the structure and components of the LexA regulon in Alpha Proteobacteria.
- To experimentally validate computational findings regarding the LexA regulon in this bacterial class.
Main Methods:
- Employed a hybrid approach combining in silico comparative genomics with in vitro and in vivo experimental techniques.
- Utilized experimental validation to confirm predictions from comparative genomic analyses.
Main Results:
- Provided the first experimentally validated map of the LexA regulon in Alpha Proteobacteria.
- Identified a conserved core set of genes (recA, ssb, uvrA, ruvCAB) within the LexA regulon across both Alpha and Gamma Proteobacteria.
Conclusions:
- The LexA regulon in Alpha Proteobacteria has been characterized, expanding our understanding beyond Gamma Proteobacteria.
- A conserved core of essential DNA repair genes appears to define the LexA network across the Proteobacteria phylum.