Reference: Dodson AE and Rine J (2016) Donor Preference Meets Heterochromatin: Moonlighting Activities of a Recombinational Enhancer in Saccharomyces cerevisiae. Genetics 204(3):1065-1074

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Abstract


In Saccharomyces cerevisiae, a small, intergenic region known as the recombination enhancer regulates donor selection during mating-type switching and also helps shape the conformation of chromosome III. Using an assay that detects transient losses of heterochromatic repression, we found that the recombination enhancer also acts at a distance in cis to modify the stability of gene silencing. In a mating-type-specific manner, the recombination enhancer destabilized the heterochromatic repression of a gene located ∼17 kbp away. This effect depended on a subregion of the recombination enhancer that is largely sufficient to determine donor preference. Therefore, this subregion affects both recombination and transcription from a distance. These observations identify a rare example of long-range transcriptional regulation in yeast and raise the question of whether other cis elements also mediate dual effects on recombination and gene expression.

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Dodson AE, Rine J
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