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Nature Structural & Molecular Biology 14, 710–715 (1 August 2007) | doi:10.1038/nsmb1277

CCDC98 is a BRCA1-BRCT domain|[ndash]|binding protein involved in the DNA damage response

Hongtae Kim , Jun Huang & Junjie Chen

The product of the breast cancer-1 gene, BRCA1, plays a crucial part in the DNA damage response through its interactions with many proteins, including BACH1, CtIP and RAP80. Here we identify a coiled-coil domain–containing protein, CCDC98, as a BRCA1-interacting protein. CCDC98 colocalizes with BRCA1 and is required for the formation of BRCA1 foci in response to ionizing radiation. Moreover, like BRCA1, CCDC98 has a role in radiation sensitivity and damage-induced G2/M checkpoint control. Together, these results suggest that CCDC98 is a mediator of BRCA1 function involved in the mammalian DNA damage response.