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Reference: Laine JP, et al. (2009) A physiological role for gene loops in yeast. Genes Dev 23(22):2604-9

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Abstract

DNA loops that juxtapose the promoter and terminator regions of RNA polymerase II-transcribed genes have been identified in yeast and mammalian cells. Loop formation is transcription-dependent and requires components of the pre-mRNA 3'-end processing machinery. Here we report that looping at the yeast GAL10 gene persists following a cycle of transcriptional activation and repression. Moreover, GAL10 and a GAL1p-SEN1 reporter undergo rapid reactivation kinetics following a cycle of activation and repression-a phenomenon defined as "transcriptional memory"-and this effect correlates with the persistence of looping. We propose that gene loops facilitate transcriptional memory in yeast.

Reference Type
Journal Article
Authors
Laine JP, Singh BN, Krishnamurthy S, Hampsey M
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