The relative roles in vivo of Saccharomyces cerevisiae Pol eta, Pol zeta, Rev1 protein and Pol32 in the bypass and mutation induction of an abasic site, T-T (6-4) photoadduct and T-T cis-syn cyclobutane dimer

Genetics. 2005 Feb;169(2):575-82. doi: 10.1534/genetics.104.034611. Epub 2004 Nov 1.


We have investigated the relative roles in vivo of Saccharomyces cerevisiae DNA polymerase eta, DNA polymerase zeta, Rev1 protein, and the DNA polymerase delta subunit, Pol32, in the bypass of an abasic site, T-T (6-4) photoadduct and T-T cis-syn cyclobutane dimer, by transforming strains deleted for RAD30, REV3, REV1, or POL32 with duplex plasmids carrying one of these DNA lesions located within a 28-nucleotide single-stranded region. DNA polymerase eta was found to be involved only rarely in the bypass of the T-T (6-4) photoadduct or the abasic sites in the sequence context used, although, as expected, it was solely responsible for the bypass of the T-T dimer. We argue that DNA polymerase zeta, rather than DNA polymerase delta as previously suggested, is responsible for insertion in bypass events other than those in which polymerase eta performs this function. However, DNA polymerase delta is involved indirectly in mutagenesis, since the strain lacking its Pol32 subunit, known to be deficient in mutagenesis, shows as little bypass of the T-T (6-4) photoadduct or the abasic sites as those deficient in Pol zeta or Rev1. In contrast, bypass of the T-T dimer in the pol32delta strain occurs at the wild-type frequency.

Publication types

  • Comparative Study
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Base Sequence
  • DNA Adducts / genetics
  • DNA Polymerase III / genetics
  • DNA Polymerase III / metabolism*
  • DNA, Fungal / metabolism
  • DNA-Directed DNA Polymerase / genetics
  • DNA-Directed DNA Polymerase / metabolism*
  • Fungal Proteins / genetics
  • Fungal Proteins / metabolism
  • Genetic Vectors
  • Kinetics
  • Mutagenesis*
  • Mutagenesis, Insertional
  • Mutagens / pharmacology
  • Mutation
  • Nucleotidyltransferases / genetics
  • Nucleotidyltransferases / metabolism*
  • Plasmids / genetics
  • Pyrimidine Dimers / metabolism
  • Saccharomyces cerevisiae / drug effects
  • Saccharomyces cerevisiae / enzymology*
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Transformation, Genetic


  • DNA Adducts
  • DNA, Fungal
  • Fungal Proteins
  • Mutagens
  • Pyrimidine Dimers
  • Saccharomyces cerevisiae Proteins
  • DNA polymerase zeta
  • Nucleotidyltransferases
  • REV1 protein, S cerevisiae
  • DNA Polymerase III
  • DNA-Directed DNA Polymerase
  • Rad30 protein