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Compromised BRCA1-PALB2 interaction is associated with breast cancer risk.

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A novel PALB2 gene variant, L35P, is the first identified pathogenic missense mutation in this breast cancer suppressor. It disrupts the PALB2-BRCA1 interaction, impairing DNA repair and increasing cancer risk.

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Area of Science:

  • Genetics and Genomics
  • Cancer Biology
  • Molecular Biology

Background:

  • BRCA1 and BRCA2 are key breast cancer suppressor proteins involved in DNA repair.
  • PALB2 links BRCA1 and BRCA2 in the homologous recombination (HR) pathway.
  • Interpreting missense variants in these genes is challenging for pathogenicity assessment.

Purpose of the Study:

  • To identify and characterize pathogenic missense variants in PALB2.
  • To investigate the role of the PALB2-BRCA1 interaction in breast cancer suppression.
  • To establish the pathogenicity of a novel PALB2 variant, c.104T>C (p.L35P).

Main Methods:

  • Segregation analysis in a family with breast cancer history.
  • Functional assays to assess HR promotion and drug resistance.
  • Whole-exome sequencing to identify somatic mutations.
  • Analysis of germline variants in the PALB2 N-terminal BRCA1-binding domain.

Main Results:

  • The novel PALB2 variant L35P abrogates the PALB2-BRCA1 interaction.
  • L35P completely disables HR promotion and resistance to platinum salts and PARP inhibitors.
  • A tumor from a carrier showed a second somatic truncating PALB2 mutation and HR-defective genomic features.
  • Other germline variants in the PALB2 BRCA1-binding domain variably affect HR function.

Conclusions:

  • L35P is the first pathogenic missense mutation identified in PALB2.
  • The PALB2-BRCA1 interaction is essential for breast cancer suppression.
  • Germline variants in the PALB2 BRCA1-binding domain may contribute to cancer development.