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Journal Article
Research Support, Non-U.S. Gov't
Post-transcriptional Regulation of Nkx2-5 by RHAU in Heart Development.
Cell Reports 2015 October 28
RNA G-quadruplexes (G4s) play important roles in RNA biology. However, the function and regulation of mRNA G-quadruplexes in embryonic development remain elusive. Previously, we identified RHAU (DHX36, G4R1) as an RNA helicase that resolves mRNA G-quadruplexes. Here, we find that cardiac deletion of Rhau leads to heart defects and embryonic lethality in mice. Gene expression profiling identified Nkx2-5 mRNA as a target of RHAU that associates with its 5' and 3' UTRs and modulates its stability and translation. The 5' UTR of Nkx2-5 mRNA contains a G-quadruplex that requires RHAU for protein translation, while the 3' UTR of Nkx2-5 mRNA possesses an AU-rich element (ARE) that facilitates RHAU-mediated mRNA decay. Thus, we uncovered the mechanisms underlying Nkx2-5 post-transcriptional regulation during heart development. Meanwhile, this study demonstrates the function of mRNA 5' UTR G-quadruplex-mediated protein translation in organogenesis.
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