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Genes Dev. 2009 Nov 15;23(22):2604-9. doi: 10.1101/gad.1823609.

A physiological role for gene loops in yeast.

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  • 1Department of Biochemistry, Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA.


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.

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