New structural and mechanistic insight into the A-rule and the instructional and non-instructional behavior of DNA photoproducts and other lesions.

Abstract excerpt

The A-rule in mutagenesis was originally proposed to explain the preponderance of X-->T mutations observed for abasic sites and UV damaged sites. It was deduced that when a polymerase was faced with a non-instructional lesion, typified by an abasic site, it would preferentially incorporate an A. In the absence of any other compelling explanation, any lesion causing an X-->T mutation has often been classified as...

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