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Lu, H. et al.

The BRCA2- interacting protein BCCIP functions in RAD51 and BRCA2 focus formation and homologous recombinational repair.

Homologous recombinational repair (HRR) of DNA damage is critical for maintaining genome stability and tumor suppression. RAD51 and BRCA2 colocalization in nuclear foci is a hallmark of HRR. BRCA2 has important roles in RAD51 focus formation and HRR of DNA double-strand breaks (DSBs). We previously reported that BCCIPalpha interacts with BRCA2. We show that a second isoform, BCCIPbeta, also interacts with BRCA2 and that this interaction occurs in a region shared by BCCIPalpha and BCCIPbeta. We further show that chromatin-bound BRCA2 colocalizes with BCCIP nuclear foci and that most radiation-induced RAD51 foci colocalize with BCCIP. Reducing BCCIPalpha by 90% or BCCIPbeta by 50% by RNA interference markedly reduces RAD51 and BRCA2 foci and reduces HRR of DSBs by 20- to 100-fold. Similarly, reducing BRCA2 by 50% reduces RAD51 and BCCIP foci. These data indicate that BCCIP is critical for BRCA2- and RAD51-dependent responses to DNA damage and HRR.[1]

References

The BRCA2-interacting protein BCCIP functions in RAD51 and BRCA2 focus formation and homologous recombinational repair. Lu, H., Guo, X., Meng, X., Liu, J., Allen, C., Wray, J., Nickoloff, J.A., Shen, Z. Mol. Cell. Biol. (2005) [Pubmed]

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