Stem Cell Research (Mar 2014)

Cardiomyogenesis is controlled by the miR-99a/let-7c cluster and epigenetic modifications

  • Antonietta Coppola,
  • Antonio Romito,
  • Christelle Borel,
  • Corinne Gehrig,
  • Maryline Gagnebin,
  • Emilie Falconnet,
  • Antonella Izzo,
  • Lucia Altucci,
  • Sandro Banfi,
  • Stylianos E. Antonarakis,
  • Gabriella Minchiotti,
  • Gilda Cobellis

DOI
https://doi.org/10.1016/j.scr.2013.11.008
Journal volume & issue
Vol. 12, no. 2
pp. 323 – 337

Abstract

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Understanding the molecular basis of cardiomyocyte development is critical for understanding the pathogenesis of pre- and post-natal cardiac disease. MicroRNAs (miRNAs) are post-transcriptional modulators of gene expression that play an important role in many developmental processes. Here, we show that the miR-99a/let-7c cluster, mapping on human chromosome 21, is involved in the control of cardiomyogenesis by altering epigenetic factors. By perturbing miRNA expression in mouse embryonic stem cells, we find that let-7c promotes cardiomyogenesis by upregulating genes involved in mesoderm specification (T/Bra and Nodal) and cardiac differentiation (Mesp1, Nkx2.5 and Tbx5). The action of let-7c is restricted to the early phase of mesoderm formation at the expense of endoderm and its late activation redirects cells toward other mesodermal derivatives. The Polycomb complex group protein Ezh2 is a direct target of let-7c, which promotes cardiac differentiation by modifying the H3K27me3 marks from the promoters of crucial cardiac transcription factors (Nkx2.5, Mef2c, Tbx5). In contrast, miR-99a represses cardiac differentiation via the nucleosome-remodeling factor Smarca5, attenuating the Nodal/Smad2 signaling. We demonstrated that the identified targets are underexpressed in human Down syndrome fetal heart specimens. By perturbing the expression levels of these miRNAs in embryonic stem cells, we were able to demonstrate that these miRNAs control lineage- and stage-specific transcription factors, working in concert with chromatin modifiers to direct cardiomyogenesis.