Regulation of miR-200c/141 expression by intergenic DNA-looping and transcriptional read-through

Luciana Batista, Brigitte Bourachot, Bogdan Mateescu, Fabien Reyal and Fatima Mechta-Grigoriou ()
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Luciana Batista: Stress and Cancer Laboratory, Equipe Labelisée LNCC, Institut Curie, PSL Research University
Brigitte Bourachot: Stress and Cancer Laboratory, Equipe Labelisée LNCC, Institut Curie, PSL Research University
Bogdan Mateescu: Stress and Cancer Laboratory, Equipe Labelisée LNCC, Institut Curie, PSL Research University
Fabien Reyal: Residual Tumor and Response to Treatment Laboratory, Institut Curie
Fatima Mechta-Grigoriou: Stress and Cancer Laboratory, Equipe Labelisée LNCC, Institut Curie, PSL Research University

Nature Communications, 2016, vol. 7, issue 1, 1-17

Abstract: Abstract The miR-200 family members have been implicated in stress responses and ovarian tumorigenesis. Here, we find that miR-200c/141 transcription is intimately linked to the transcription of the proximal upstream gene PTPN6 (SHP1) in all physiological conditions tested. PTPN6 and miR-200c/141 are transcriptionally co-regulated by two complementary mechanisms. First, a bypass of the regular PTPN6 polyadenylation signal allows the transcription of the downstream miR-200c/141. Second, the promoters of the PTPN6 and miR-200c/141 transcription units physically interact through a 3-dimensional DNA loop and exhibit similar epigenetic regulation. Our findings highlight that transcription of intergenic miRNAs is a novel outcome of transcriptional read-through and reveal a yet unexplored type of DNA loop associating two closely located promoters. These mechanisms have significant relevance in ovarian cancers and stress response, pathophysiological conditions in which miR-200c/141 exert key functions.

Date: 2016
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DOI: 10.1038/ncomms9959

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