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A PRMT5-RNF168-SMURF2 Axis Controls H2AX Proteostasis.

Changzheng Du1, Landon J Hansen2, Simranjit X Singh3

  • 1The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, NC 27710, USA; Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA; Gastrointestinal Cancer Center, Peking University Cancer Hospital, Beijing 100142, China.

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PubMed
Summary

A newly identified PRMT5-RNF168-SMURF2 pathway regulates H2AX protein levels, crucial for genomic stability. Loss of this pathway in MTAP-deficient glioblastoma leads to increased DNA damage.

Keywords:
H2AXMTAPPRMT5RNF168SMURF2glioblastoma

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cancer Research

Background:

  • Genomic stability is maintained by histone variant H2AX, but its proteostasis mechanisms remain unclear.
  • H2AX plays a critical role in DNA damage response (DDR).

Purpose of the Study:

  • To elucidate the mechanisms governing H2AX proteostasis.
  • To identify key regulators of H2AX stability in the context of DNA damage.

Main Methods:

  • Investigated the role of PRMT5, RNF168, and SMURF2 in H2AX regulation.
  • Utilized methylthioadenosine phosphorylase (MTAP)-deficient glioblastoma models.
  • Assessed DNA damage levels in response to genotoxic agents.

Main Results:

  • Identified a PRMT5-RNF168-SMURF2 cascade regulating H2AX proteostasis.
  • PRMT5 loss in MTAP-deficient glioblastoma reduces RNF168, destabilizing H2AX via SMURF2.
  • MTAP-deficient glioblastoma cells exhibit elevated DNA damage due to this disrupted cascade.

Conclusions:

  • Revealed a novel regulatory mechanism for H2AX proteostasis.
  • Defined a critical DDR signaling cascade disrupted by metabolic enzyme loss in tumors.
  • This pathway is essential for maintaining genomic integrity and preventing DNA damage.