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FMRP regulates miR196a-mediated repression of HOXB8 via interaction with the AGO2 MID domain

Ying Li1, Wei Tang, Li-rong Zhang

  • 1Single-Molecule Detection and Imaging Laboratory, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Guangdong, China. zhangcy@siat.ac.cn.

Molecular Biosystems
|April 15, 2014
PubMed

Insights

Fragile X syndrome (FXS) research reveals how FMRP phosphorylation enhances miR-196a repression of HOXB8 mRNA. This finding offers new insights into FXS molecular pathogenesis and FMRP-miRNA regulatory cross-talk.

Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • Fragile X syndrome (FXS) results from reduced fragile X mental retardation protein (FMRP) expression, impacting mRNA regulation.
  • The interplay between FMRP, microRNAs (miRNAs), and shared mRNA targets is not well understood.

Purpose of the Study:

  • To investigate the functional association between FMRP, miR-196a, and HOXB8 mRNA regulation.
  • To elucidate the role of FMRP phosphorylation in miRNA-mediated gene silencing.

Main Methods:

  • Identified HOXB8 mRNA as a target of FMRP and miR-196a.
  • Investigated the effect of FMRP phosphorylation on HOXB8 repression.
  • Mapped the FMRP-binding site on HOXB8 mRNA relative to the miR-196a recognition element.
  • Examined FMRP interaction with the AGO2 protein.

Main Results:

  • HOXB8 mRNA is a target of FMRP and is subject to miR-196a-induced silencing.
  • Phosphorylation of FMRP enhances miR-196a-mediated repression of HOXB8 mRNA without altering FMRP-mRNA binding.
  • The FMRP-binding site is downstream of the miR-196a recognition element in the HOXB8 3'UTR.
  • FMRP interacts with a specific pocket in the MID domain of AGO2.

Conclusions:

  • Phosphorylation modulates FMRP's role in miRNA-mediated mRNA repression.
  • Findings provide novel insights into the molecular pathogenesis of FXS and FMRP-miRNA regulatory networks.

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