DNA end-resection is stimulated by an interaction between BRCA1 exon 11 and TOPBP1.
- Open access
BRCA1 exon 11 interacts with TOPBP1 to specifically promote DNA end-resection during homologous recombination, crucial for tumor suppression.
- Why it matters: Understanding the functions of BRCA1 mutations, especially those affecting exon 11, is vital because they impair DNA repair and increase cancer risk. Clarifying this interaction fills a key knowledge gap about BRCA1's role in genome stability.
- What they did: Proteomic analyses revealed a DNA damage- and phospho-dependent interaction between TOPBP1 and the BRCA1 region encoded by exon 11, which is essential for end-resection but not ATR activation.
- The result: This discovery advances mechanistic understanding of BRCA1's function in homologous recombination and may inform targeted therapies for tumors with exon 11 mutations.