A new coactivator complex required for retinoic acid-dependent regulation of embryonic symmetry

Bilateral symmetry is a striking feature of the vertebrate body plan organization. Vertebral precursors, called somites, provide one of the best illustrations of embryonic symmetry. Maintenance of somitogenesis symmetry requires Retinoic acid (RA) and its coactivator Rere/Atrophin2. Here, using a pr...

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Published inbioRxiv
Main Authors Vilhais-Neto, Goncalo C, Fournier, Marjorie, Plassat, Jean-Luc, Sardiu, Mihaela E, Saraf, Anita, Garnier, Jean-Marie, Maruhashi, Mitsuji, Florens, Laurence, Washburn, Michael P, Pourquie, Olivier
Format Paper
LanguageEnglish
Published Cold Spring Harbor Cold Spring Harbor Laboratory Press 22.11.2016
Subjects
DNA-directed RNA polymerase
Embryos
HDAC2 protein
Histone deacetylase
Histone methyltransferase
Retinoic acid
Somites
Somitogenesis
Symmetry
Vertebrae
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Summary:Bilateral symmetry is a striking feature of the vertebrate body plan organization. Vertebral precursors, called somites, provide one of the best illustrations of embryonic symmetry. Maintenance of somitogenesis symmetry requires Retinoic acid (RA) and its coactivator Rere/Atrophin2. Here, using a proteomic approach we identify a protein complex, containing Wdr5, Hdac1, Hdac2 and Rere (named WHHERE), which regulates RA signalling and controls embryonic symmetry. We demonstrate that Wdr5, Hdac1 and Hdac2 are required for RA signalling in vitro and in vivo. Mouse mutants for Wdr5 and Hdac1 exhibit asymmetrical somite formation characteristic of RA-deficiency. We also identify the Rere-binding histone methyltransferase Ehmt2/G9a, as a RA coactivator controlling somite symmetry. Upon RA treatment, WHHERE and Ehmt2 become enriched at RA target genes to promote RNA Polymerase II recruitment. Our work identifies a novel protein complex linking key epigenetic regulators acting in the molecular control of embryonic bilateral symmetry.
DOI:10.1101/089201