BARD1 Participates with BRCA1 in Homology-Directed Repair of Chromosome Breaks
Open Access
- 1 November 2003
- journal article
- Published by Taylor & Francis in Molecular and Cellular Biology
- Vol. 23 (21), 7926-7936
- https://doi.org/10.1128/mcb.23.21.7926-7936.2003
Abstract
The BRCA1 tumor suppressor has been implicated in the maintenance of chromosomal stability through homology-directed repair of DNA double-strand breaks. Much of the BRCA1 in cells forms a heterodimeric complex with a structurally related protein BARD1. We report that expression of truncated mouse or human BARD1 peptides capable of interacting with Brca1 results in a homologous-repair deficiency. Repair is mildly reduced in Brca1 wild-type cells and severely reduced in cells that harbor a Brca1 splice product deleted for exon 11. Nuclear localization of the Brca1 or BARD1 peptides is not compromised, implying that the repair deficiency is caused by a more direct effect on repair. The tumor suppressor activity of BRCA1 may require the participation of BARD1 to maintain chromosome integrity through the homologous-repair pathway.Keywords
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