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The EDC4-XRN1 interaction controls P-body dynamics to link mRNA decapping with decay

William R Brothers1, Farah Ali1, Sam Kajjo1

  • 1Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada.

The EMBO Journal
|August 25, 2023
PubMed

Insights

The interaction between XRN1 and EDC4 protein regulates mRNA decapping and decay. Disrupting this interaction leads to larger processing bodies (P-bodies) that prevent mRNA decay, impacting cell viability.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Deadenylation-dependent mRNA decapping and decay is a primary pathway for cytoplasmic mRNA turnover in eukaryotes.
  • mRNA decay factors, including DCP2 and XRN1, associate with proteins like EDC4, a scaffold that enhances decapping.
  • Processing bodies (P-bodies) are ribonucleoprotein granules involved in mRNA decay but not essential for it.

Purpose of the Study:

  • To investigate the role of the EDC4-XRN1 interaction in regulating mRNA decapping and decay.
  • To determine the impact of disrupting the EDC4-XRN1 interaction on P-body dynamics and mRNA stability.
  • To elucidate the function of P-bodies in cellular processes, particularly under conditions of limited XRN1.

Main Methods:

  • Disruption of the EDC4-XRN1 interaction and alteration of their stoichiometry.
  • Analysis of mRNA decapping rates and microRNA-targeted mRNA stability.
  • Microscopy to assess P-body size and dynamics.
  • Evaluation of cell viability and stress granule formation.

Main Results:

  • Disrupting the EDC4-XRN1 interaction or altering stoichiometry inhibits mRNA decapping.
  • MicroRNA-targeted mRNAs are stabilized in a translationally repressed state upon EDC4-XRN1 interaction disruption.
  • Inhibition of decapping leads to enlarged P-bodies that actively prevent mRNA decapping.
  • P-bodies are crucial for cell viability and preventing stress granule formation when XRN1 is limited.

Conclusions:

  • The interaction between XRN1 and EDC4 is critical for coordinating mRNA decapping with 5'-3' decay in human cells.
  • P-body dynamics are regulated by the EDC4-XRN1 interaction, influencing mRNA turnover.
  • P-bodies play a vital role in maintaining cellular homeostasis, especially under stress conditions involving limited XRN1.
Keywords:
P-bodiesmRNA decappingmRNA decaymicroRNAribonucleoprotein granules

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