Journal
DEVELOPMENTAL CELL
Volume 19, Issue 6, Pages 903-912Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2010.10.022
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Funding
- NIH [2R01DE12324-12, R01HL093484-01, T32 DE15355-04, CA096824]
- American Heart Association [AHA0655077Y]
- South Central Affiliate of the American Heart Association [09PRE2150024]
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MicroRNAs (miRNAs) are small, noncoding RNAs that regulate gene expression posttranscriptionally. We investigated the hypothesis that bone morphogenetic protein (Bmp) signaling regulates miRNAs in cardiac progenitor cells. Bmp2 and Bmp4 regulate OFT myocardial differentiation via regulation of the miRNA-17-92 cluster. In Bmp mutant embryos, myocardial differentiation was delayed, and multiple miRNAs encoded by miRNA-17-92 were reduced. We uncovered functional miRNA-17-92 seed sequences within the 3' UTR of cardiac progenitor genes such as IsI1 and Tbx1. In both Bmp and miRNA-17-92 mutant embryos, IsI1 and Tbx1 expression failed to be correctly downregulated. Transfection experiments indicated that miRNA-17 and miRNA-20a directly repressed IsI1 and Tbx1. Genetic interaction studies uncovered a synergistic interaction between miRNA-17-92 cluster and Bmp4, providing direct in vivo evidence for the Bmp-miRNA-17-92 regulatory pathway. Our findings indicate that Bmp signaling directly regulates a miRNA-mediated effector mechanism that downregulates cardiac progenitor genes and enhances myocardial differentiation.
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