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DYNLL1 binds to MRE11 to limit DNA end resection in BRCA1-deficient cells

Yizhou Joseph He1, Khyati Meghani1, Marie-Christine Caron2,3

  • 1Division of Radiation and Genome Stability, Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA.

Nature
|November 23, 2018
PubMed

Insights

Scientists found that DYNLL1 limits DNA end resection, a process crucial for repairing DNA. Inhibiting DYNLL1 restores DNA repair in BRCA1-mutant cancers, potentially improving responses to chemotherapy.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • Homologous recombination (HR) is a critical DNA repair pathway often impaired in BRCA1-mutant cancers.
  • Limited DNA end resection is a known cause of HR deficiency.

Purpose of the Study:

  • To identify novel regulators of DNA end resection.
  • To investigate the role of DYNLL1 in DNA repair and its implications for cancer therapy.

Main Methods:

  • Loss-of-function CRISPR screening was employed to identify genes regulating DNA end resection.
  • Cellular and biochemical assays were used to characterize the interaction of DYNLL1 with DNA repair machinery.
  • Analysis of patient tumor data (ovarian carcinomas) to correlate gene expression with genomic stability.

Main Results:

  • DYNLL1 was identified as a novel inhibitor of DNA end resection.
  • Loss of DYNLL1 restored DNA end resection and homologous recombination in BRCA1-mutant cells, leading to resistance against platinum drugs and PARP inhibitors.
  • Low DYNLL1 expression correlated with reduced genomic alterations in BRCA1-deficient ovarian cancers.

Conclusions:

  • DYNLL1 acts as an anti-resection factor by limiting the activity of the DNA end-resection machinery.
  • Targeting DYNLL1 may represent a therapeutic strategy to enhance the efficacy of DNA-damaging agents in BRCA1-mutant cancers.
  • DYNLL1 influences genomic stability and response to chemotherapy.

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