{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMDC1 is a central mediator of the cellular response to DNA damage. Rapidly recruited to chromatin flanking double‐strand breaks by binding to phosphorylated H2AX through its elaborate BRCT domains, MDC1 acts as a scaffold for the assembly of multiple key repair and checkpoint proteins. In this early phase, MDC1 facilitates the accumulation of factors such as 53BP1, BRCA1, the MRN complex, CHK2, and the ubiquitin ligases RNF8/RNF168 – a process essential for concentrating and retaining these proteins at damage sites to sustain proper checkpoint activation and efficient repair."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role as a structural platform, MDC1 orchestrates a complex network of protein–protein interactions through its modular FHA and BRCT domains. It directly binds phosphorylated partners including NBS1, CHK2, p53 and, via its association with kinases such as ATM or casein kinase 2, becomes further posttranslationally modified to fine‐tune its activity. 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