Analysis of damage tolerance pathways in Saccharomyces cerevisiae: a requirement for Rev3 DNA polymerase in translesion synthesis.

Molecular and Cellular Biology
K BayntonRobert P Fuchs

Abstract

The replication of double-stranded plasmids containing a single N-2-acetylaminofluorene (AAF) adduct located in a short, heteroduplex sequence was analyzed in Saccharomyces cerevisiae. The strains used were proficient or deficient for the activity of DNA polymerase zeta (REV3 and rev3delta, respectively) in a mismatch and nucleotide excision repair-defective background (msh2delta rad10delta). The plasmid design enabled the determination of the frequency with which translesion synthesis (TLS) and mechanisms avoiding the adduct by using the undamaged, complementary strand (damage avoidance mechanisms) are invoked to complete replication. To this end, a hybridization technique was implemented to probe plasmid DNA isolated from individual yeast transformants by using short, 32P-end-labeled oligonucleotides specific to each strand of the heteroduplex. In both the REV3 and rev3delta strains, the two strands of an unmodified heteroduplex plasmid were replicated in approximately 80% of the transformants, with the remaining 20% having possibly undergone prereplicative MSH2-independent mismatch repair. However, in the presence of the AAF adduct, TLS occurred in only 8% of the REV3 transformants, among which 97% was mostly error free and ...Continue Reading

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Citations

Oct 12, 2010·Journal of Nucleic Acids·L Jay Stallons, W Glenn McGregor
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