Journal
CANCER CELL
Volume 10, Issue 2, Pages 145-157Publisher
CELL PRESS
DOI: 10.1016/j.ccr.2006.07.002
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Funding
- NCI NIH HHS [P01 CA064602, P50 CA83639, U54 CA112970-02, P50 CA083639, U54 CA112970, P01 CA64602, R01 CA112291, R01 CA112291-01A1] Funding Source: Medline
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BRIT1, initially identified as an hTERT repressor, has additional functions at DNA damage checkpoints. Here, we demonstrate that BRIT1 formed nuclear foci minutes after irradiation. The foci of BRIT1 colocalized with 53BP1, MDC1, NBS1, ATM, RPA, and ATR. BRIT1 was required for activation of these elements, indicating that BRIT1 is a proximal factor in the DNA damage response pathway. Depletion of BRIT1 increased the accumulation of chromosomal aberrations. In addition, decreased levels of BRIT1 were detected in several types of human cancer, with BRIT1 expression being inversely correlated with genomic instability and metastasis. These results identify BRIT1 as a crucial DNA damage regulator in the ATM/ATR pathways and suggest that it functions as a tumor suppressor gene.
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