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Mol. Cell. Biol., May 1997, 2844-2850, Vol 17, No. 5
CN Greene and S Jinks-Robertson
A change in the number of base pairs within a coding sequence can result in
a frameshift mutation, which almost invariably eliminates the function of
the encoded protein. A frameshift reversion assay with Saccharomyces
cerevisiae that can be used to examine the types of insertions and
deletions that are generated during DNA replication, as well as the editing
functions that remove such replication errors, has been developed.
Reversion spectra have been obtained in a wild-type strain and in strains
defective for defined components of the postreplicative mismatch repair
system (msh2, msh3, msh6, msh3 msh6, pms1, and mih1 mutants). Comparison of
the spectra reveals that yeast mismatch repair proteins preferentially
remove frameshift intermediates that arise in homopolymer tracts and
indicates that some of the proteins have distinct substrate or context
specificities.
Copyright © 1997, American Society for Microbiology
Frameshift intermediates in homopolymer runs are removed efficiently by yeast mismatch repair proteins
Graduate Program in Genetics and Molecular Biology, Emory University, Atlanta, Georgia 30322, USA.
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