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Houseley J, et al.  (2008) A ncRNA Modulates Histone Modification and mRNA Induction in the Yeast GAL Gene Cluster. Mol Cell 32(5):685-95

Abstract: The extensively studied yeast GAL1-10 gene cluster is tightly regulated by environmental sugar availability. Unexpectedly, under repressive conditions the 3' region of the GAL10 coding sequence is trimethylated by Set1 on histone H3 K4, normally characteristic of 5' regions of actively transcribed genes. This reflects transcription of a long noncoding RNA (GAL10-ncRNA) that is reciprocal to GAL1 and GAL10 mRNAs and driven by the DNA-binding protein Reb1. Point mutations in predicted Reb1-binding sites abolished Reb1 binding and ncRNA synthesis. The GAL10-ncRNA is transcribed approximately once every 50 min and targeted for degradation by the TRAMP and exosome complexes, resulting in low steady-state levels (approximately one molecule per 14 cells). GAL10-ncRNA transcription recruits the methyltransferase Set2 and histone deacetylation activities in cis, leading to stable changes in chromatin structure. These chromatin modifications act principally through the Rpd3S complex to aid glucose repression of GAL1-10 at physiologically relevant sugar concentrations.

Status: Published Type: Journal Article PubMed ID: 19061643

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Topics Genes linked to topics
EAF3 GAL10 HDA1 HHT1 HHT2 REB1 RPD3 SET1 SIR2
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