Abstract

Mutagenesis by C-to-U events specifically in either DNA strand assayed with ung uvrA defective Escherichia coli on a metabolically restrictive medium produces more glutamine tRNA suppressor mutations from U occurring in the non-transcribed DNA strand than from U in the transcribed (template) DNA strand. This bias is the reverse of what might be expected from transcriptional mutagenesis (mutation expression utilizing mutated RNA transcribed from damaged template strand DNA). The results and related ideas are discussed.

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