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. 1992 Apr;174(8):2548–2559. doi: 10.1128/jb.174.8.2548-2559.1992

Ty insertions upstream and downstream of native DUR1,2 promoter elements generate different patterns of DUR1,2 expression in Saccharomyces cerevisiae.

G E Chisholm 1, T G Cooper 1
PMCID: PMC205893  PMID: 1313414

Abstract

Expression of allantoin pathway genes is subject to induction and nitrogen catabolite repression. Two classes of cis-dominant mutations (DUR80 and DUR1,2-Oh) result in overproduction of DUR1,2 mRNA. In DUR80 mutants, DUR1,2 expression remained inducible, nitrogen catabolite repression sensitive, and unresponsive to cell ploidy, i.e., overproduction was superimposed on normal gene regulation. DUR1,2-Oh mutations, in contrast, generated a pattern of DUR1,2 expression similar to that often reported when a Ty element inserts upstream of a gene, the ROAM phenotype. We analyzed four independent DUR80 and DUR1,2-Oh alleles. The DUR1,2-Oh mutation was, as expected, a Ty insertion at -445 3' of the native DUR1,2 upstream activation sequences (UASs). All three DUR80 alleles were also Ty insertions between -644 and -653 immediately 5' of the native DUR1,2 USASs. We suggest that the difference in DUR1,2-Oh and DUR80 phenotypes depends on whether the native cis-acting elements and transcription factors associated with them can operate. If they can, enhancement of normally regulated DUR1,2 expression is observed. This is a novel phenotype for Ty insertions. If the native DUR1,2 cis-acting elements are not present, the case when Ty insertion occurs 3' of them, a ROAM phenotype is generated. Nitrogen-regulated upstream activation sequence (UASNTR)-homologous sequences present in the Ty delta elements rather than cis-acting elements required for Ty transcription are the most likely candidates to serve as the cis-acting elements mediating the DUR80 phenotype.

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Selected References

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