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New perspectives on epigenetic modifications and PARP inhibitor resistance in HR-deficient cancers

Rachel Bayley1, Ellie Sweatman1, Martin R Higgs2,1

  • 1Both authors contributed equally.

Cancer Drug Resistance (Alhambra, Calif.)
|April 17, 2023
PubMed

Insights

Poly(ADP) ribose polymerase (PARP) inhibitors are vital for treating DNA-repair defective tumors. However, resistance can emerge, and SETD1A is identified as a novel factor contributing to this PARP inhibitor resistance.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Poly(ADP) ribose polymerase (PARP) inhibitors have transformed cancer therapy for DNA-repair deficient tumors.
  • Drug resistance remains a significant clinical challenge, often involving altered DNA damage response pathways.

Purpose of the Study:

  • To identify novel mechanisms of resistance to PARP inhibitors (PARPi).
  • To investigate the role of the lysine methyltransferase SETD1A in conferring PARPi resistance.

Main Methods:

  • Analysis of DNA damage response pathways.
  • Investigation of epigenetic modifications, specifically H3K4 methylation.
  • Functional studies on SETD1A in cancer models.

Main Results:

  • SETD1A was identified as a novel factor mediating resistance to PARP inhibitors.
  • SETD1A's role is linked to epigenetic modifications, including H3K4 methylation.
  • Understanding SETD1A's mechanism offers insights into overcoming PARPi resistance.

Conclusions:

  • SETD1A is a key player in PARPi resistance in DNA-repair deficient cancers.
  • Targeting epigenetic modifications like H3K4 methylation may offer strategies to circumvent resistance.
  • Further research into SETD1A and related pathways could refine clinical PARPi use.
Keywords:
BOD1LDouble strand break repairH3K4PARP inhibitorSETD1Ahistone methylationresistance

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