2. Academic Validation
  3. RNA helicases DDX5 and DDX17 dynamically orchestrate transcription, miRNA, and splicing programs in cell differentiation

RNA helicases DDX5 and DDX17 dynamically orchestrate transcription, miRNA, and splicing programs in cell differentiation

  • Cell Rep. 2014 Jun 26;7(6):1900-13. doi: 10.1016/j.celrep.2014.05.010.
Etienne Dardenne 1,  Micaela Polay Espinoza 1,  Laurent Fattet 1,  Sophie Germann 1,  Marie-Pierre Lambert 1,  Helen Neil 1,  Eleonora Zonta 1,  Hussein Mortada 1,  Lise Gratadou 1,  Mathieu Deygas 1,  Fatima Zahra Chakrama 1,  Samaan Samaan 1,  François-Olivier Desmet 1,  Léon-Charles Tranchevent 1,  Martin Dutertre 1,  Ruth Rimokh 1,  Cyril F Bourgeois 2,  Didier Auboeuf 3
Affiliations

Affiliations

  • 1 INSERM U1052, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France; CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France; Université Claude Bernard Lyon 1, 69008 Lyon, France; Centre Léon Bérard, 69008 Lyon, France.
  • 2 INSERM U1052, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France; CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France; Université Claude Bernard Lyon 1, 69008 Lyon, France; Centre Léon Bérard, 69008 Lyon, France. Electronic address: cyril.bourgeois@inserm.fr.
  • 3 INSERM U1052, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France; CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, 69008 Lyon, France; Université Claude Bernard Lyon 1, 69008 Lyon, France; Centre Léon Bérard, 69008 Lyon, France. Electronic address: didier.auboeuf@inserm.fr.
PMID: 24910439 DOI: 10.1016/j.celrep.2014.05.010
Abstract

The RNA helicases DDX5 and DDX17 are members of a large family of highly conserved proteins that are involved in gene-expression regulation; however, their in vivo targets and activities in biological processes such as cell differentiation, which requires reprogramming of gene-expression programs at multiple levels, are not well characterized. Here, we uncovered a mechanism by which DDX5 and DDX17 cooperate with heterogeneous nuclear ribonucleoprotein (hnRNP) H/F splicing factors to define epithelial- and myoblast-specific splicing subprograms. We then observed that downregulation of DDX5 and DDX17 protein expression during myogenesis and epithelial-to-mesenchymal transdifferentiation contributes to the switching of splicing programs during these processes. Remarkably, this downregulation is mediated by the production of miRNAs induced upon differentiation in a DDX5/DDX17-dependent manner. Since DDX5 and DDX17 also function as coregulators of master transcriptional regulators of differentiation, we propose to name these proteins "master orchestrators" of differentiation that dynamically orchestrate several layers of gene expression.

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