Contrasting properties of gene-specific regulatory, coding, and copy number mutations in Saccharomyces cerevisiae: frequency, effects, and dominance.

PLoS Genetics
Jonathan D GruberPatricia J Wittkopp

Abstract

Genetic variation within and between species can be shaped by population-level processes and mutation; however, the relative impact of "survival of the fittest" and "arrival of the fittest" on phenotypic evolution remains unclear. Assessing the influence of mutation on evolution requires understanding the relative rates of different types of mutations and their genetic properties, yet little is known about the functional consequences of new mutations. Here, we examine the spectrum of mutations affecting a focal gene in Saccharomyces cerevisiae by characterizing 231 novel haploid genotypes with altered activity of a fluorescent reporter gene. 7% of these genotypes had a nonsynonymous mutation in the coding sequence for the fluorescent protein and were classified as "coding" mutants; 2% had a change in the S. cerevisiae TDH3 promoter sequence controlling expression of the fluorescent protein and were classified as "cis-regulatory" mutants; 10% contained two copies of the reporter gene and were classified as "copy number" mutants; and the remaining 81% showed altered fluorescence without a change in the reporter gene itself and were classified as "trans-acting" mutants. As a group, coding mutants had the strongest effect on report...Continue Reading

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Methods Mentioned

BETA
flow cytometry
FACS
fluorescence activated cell sorting
PCR

Software Mentioned

Ensembl

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