Genetic requirements for frameshift reversion induced by bulky DNA adducts in M13 DNA

Craig B. Bennett, Xun Luo, M. Zafri Humayun

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In order to analyze the genetic requirements and mechanisms of frameshift mutagenesis by activated aflatoxin B1 (AFB1), in vitro-modified phage M13 replicative form (RF) DNA was transfected into appropriate Escherichia coli cells and +1 or -1 frameshift revertants in the lacZ(α) gene were isolated. This analysis shows that both +1 and -1 frameshift mutagenesis by AFB1 is significantly reduced in a umuC- background. On the other hand, in the absence of RecA, +1 frameshift mutagenesis is partially reduced, but -1 frameshift mutageneis is unaffected. DNA sequence analysis of +1 frameshifts induced by AFB1 in recA- cells suggests that the mutations occur at the same sites as in recA+ cells, but that there are significant differences in the specificity of the observed base changes. A model consistent with the observed effects in the absence of RecA suggests that an appreciable fraction of AFB1-adducted guanines can correctly template for a cytosine.

Original languageEnglish (US)
Pages (from-to)19-27
Number of pages9
JournalMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis
Issue number1
StatePublished - Jul 1991

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Genetics
  • Health, Toxicology and Mutagenesis


  • Aflatoxin
  • Frameshift mutagenesis
  • Phage M13
  • SOS functions
  • umuC

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