The in Vivo Mutagenic Frequency and Specificity of O6-methylguanine in Phi X174 Replicative Form DNA

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1986 Oct 1

PMID 2945203

Citations 25

Authors

O S Bhanot

A Ray

Affiliations

Soon will be listed here.

Abstract

A bacteriophage phi X174-based site-specific mutagenesis system for the study of the in vivo mutagenic frequency and specificity of carcinogen-induced modification in DNA is presented. A (-)-strand primer containing O6-methylguanine in a specific site was hybridized to a single-stranded region in gene G of phi X gapped duplex DNA. The hybrid was enzymatically converted to replicative form DNA and was used to transform Escherichia coli cells. All gene G mutants generated by the modification were rescued by genetic complementation. An amber mutation in lysis gene E of the (+) strand of the replicative form DNA prevented lytic growth of wild-type phage derived from this strand. In each mutant-containing infective center produced from the transformed cells, gene G mutant phage were present in a 3:1 ratio compared to wild type. Thus, in vivo, O6-methylguanine in replicating phi X DNA has a mutagenic frequency of 75%. When repair of O6 methylguanine occurred, it was prereplicative. The mutations were due exclusively to the misincorporation of thymine.

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