Multifactorial contributions to an acute DNA damage response by BRCA1/BARD1-containing complexes

UMMS Affiliation

Department of Cancer Biology



Document Type



BRCA1 Protein; Carrier Proteins; Cell Cycle; Cell Cycle Proteins; Cell Line, Tumor; *DNA Damage; DNA Repair; DNA Repair Enzymes; DNA-Binding Proteins; Humans; Nuclear Proteins; Protein Binding; Tumor Suppressor Proteins; Ubiquitin-Protein Ligases


The BRCA1 gene product and its stoichiometric binding partner, BARD1, play a vital role in the cellular response to DNA damage. However, how they acquire specific biochemical functions after DNA damage is poorly understood. Following exposure to genotoxic stress, DNA damage-specific interactions were observed between BRCA1/BARD1 and the DNA damage-response proteins, TopBP1 and Mre11/Rad50/NBS1. Two distinct DNA damage-dependent super complexes emerged; their activation was dependent, in part, on the actions of specific checkpoint kinases, and each super complex contributed to a distinctive aspect of the DNA damage response. The results support a new, multifactorial model that describes how genotoxic stress enables BRCA1 to execute a diverse set of DNA damage-response functions.

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Citation: Genes Dev. 2006 Jan 1;20(1):34-46. Link to article on publisher's site

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