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. 1984 Jan;4(1):61–68. doi: 10.1128/mcb.4.1.61

Carbon source dependence of transposable element-associated gene activation in Saccharomyces cerevisiae.

A K Taguchi, M Ciriacy, E T Young
PMCID: PMC368658  PMID: 6321953

Abstract

Seven cis-dominant mutations leading to the overproduction of the glucose-repressible alcohol dehydrogenase isozyme ADHII (structural gene, ADH2) in Saccharomyces cerevisiae have previously been shown to be due to insertion of a transposable element, Ty, in the 5' regulatory region of the ADH2 gene. We showed that although mating-competent cells (a, alpha, a/a, or alpha/alpha cells) overproduced both ADHII enzyme and ADH2 mRNA, mating-incompetent cells (a/alpha or ste-cells) produced much less ADHII enzyme and ADH2 mRNA. This mating type effect on ADH2 expression was greatest in the presence of a normally derepressing carbon source, glycerol, and much less apparent in the presence of a repressing carbon source, glucose. In addition, Ty insertion led to an aberrant carbon source response in mating-incompetent cells--the normally glucose-repressible ADHII becomes glycerol repressible. The mating type effect and aberrant carbon source response in mating-incompetent cells was specific for Ty-associated mutations in the 5' flanking region of the ADH2 gene in that a non-Ty mutation in the same region did not show these effects. Finally, Ty1 RNA levels also showed a/alpha, suppression, which was apparent only during growth on a nonfermentable carbon source such as glycerol. This suggests that Ty-mediated gene expression is subject to regulation by both mating competence and carbon catabolites.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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