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The spontaneous rate of G.C--&gt;A.T mutations and a hotspot T.A--&gt;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--&gt;T.A transversion, an A.T--&gt;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.

Transcription increases multiple spontaneous point mutations in Salmonella enterica