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RNA helicase RHAU is essential for heart development by regulating Nkx2-5 mRNA stability and translation via G-quadruplex structures. Its absence causes embryonic lethality and heart defects in mice.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • RNA Biology

Background:

  • RNA G-quadruplexes (G4s) are crucial in RNA biology, but their roles in embryonic development are not fully understood.
  • The RNA helicase RHAU (DHX36) is known to resolve mRNA G-quadruplexes.

Purpose of the Study:

  • To investigate the function and regulation of mRNA G-quadruplexes in embryonic development.
  • To elucidate the role of RHAU in cardiac development and identify its mRNA targets.

Main Methods:

  • Cardiac-specific deletion of Rhau in mice.
  • Gene expression profiling.
  • Analysis of mRNA stability and translation using Nkx2-5 as a target.

Main Results:

  • Cardiac deletion of Rhau resulted in heart defects and embryonic lethality.
  • Nkx2-5 mRNA was identified as a RHAU target, with RHAU binding to its 5' and 3' UTRs.
  • A 5' UTR G-quadruplex in Nkx2-5 mRNA requires RHAU for translation, while a 3' UTR AU-rich element (ARE) mediates RHAU-dependent mRNA decay.

Conclusions:

  • RHAU regulates Nkx2-5 mRNA post-transcriptionally through distinct mechanisms involving G-quadruplexes and AREs.
  • mRNA 5' UTR G-quadruplex-mediated translation is critical for organogenesis.
  • This study reveals novel insights into RNA G-quadruplex function in embryonic heart development.