title: Transcription increases multiple spontaneous point mutations in Salmonella enterica.
abstract: The spontaneous rate of G.C-->A.T mutations and a hotspot T.A-->G.C transversion are known to increase with the frequency of transcription-increases that have been ascribed primarily to processes that affect only these specific mutations. To investigate how transcription induces other spontaneous point mutations, we tested for its effects in repair-proficient Salmonella enterica using reversion assays of chromosomally inserted alleles. Our results indicate that transcription increases rates of all tested point mutations in the induced gene: induction significantly increased the individual rates of an A.T-->T.A transversion, an A.T-->G.C transition and the pooled rates of the three other point mutations assayed. Although the S.enterica genome is thought to have a mutational bias towards G.C base pairs, transitions creating A.T pairs were approximately 10 times more frequent than the reverse mutation, resulting in an overall mutation pressure to lower G+C contents. Transitions occurred at roughly twice the rate of transversions, similar to results from sequence comparisons; however, several individual transversions are more frequent than the least common transition.
authors.affiliation: Department of Biochemistry and Molecular Biophysics, University of Arizona, Tucson, AZ 85721, USA.
authors.forename: Richard Ellis
authors.initials: RE
authors.lastname: Hudson
authors.forename: Ulfar
authors.initials: U
authors.lastname: Bergthorsson
authors.forename: Howard
authors.initials: H
authors.lastname: Ochman
mesh_terms: D024881:Drug Resistance, Bacterial; D005798:Genes, Bacterial; D017354:Point Mutation; D012293:Rifampin / Q000494:pharmacology; D019779:Salmonella enterica / Q000187:drug effects / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D012293:Rifampin