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Higher-order chromatin structure presents a barrier to the recognition and repair of DNA lesions. Thus, cells must be equipped with mechanisms to surpass this natural obstacle. DNA damage induces histone H2AX phosphorylation by the phosphoinositide 3-kinase like kinases ATM, ATR and DNA-PKcs. H2AX phosphorylation contributes to DNA double-strand break repair but the mechanisms involved are not yet...
The protein MDC1/NFBD1 contains a forkhead-associated (FHA) domain and two BRCA1 carboxyl-terminal (BRCT) domains. It interacts with several proteins involved in DNA damage repair and checkpoint signalling, and is phosphorylated in response to DNA damage and during mitosis. Upon treatment of cultured human cells with DNA damaging agents, MDC1/NFBD1 translocates to sites of DNA lesions, where it collaborates...
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