{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMCM4 is a critical component of the MCM2–7 helicase complex that is essential for the initiation and progression of DNA replication. Its function is finely tuned by phosphorylation events mediated by key kinases such as Cdc7 and various cyclin‐dependent kinases, which modify specific N‐terminal residues to regulate helicase activity and DNA unwinding at replication origins. These phosphorylation events—including those at (S/T)(S/T)P motifs—govern the assembly and activation of the helicase complex, coordinate replication checkpoint control, and even counteract replication fork progression when DNA damage is encountered. In evolutionary terms, studies in both eukaryotic and archaeal systems underscore the conserved nature of MCM4’s role in replication, further highlighting its importance in maintaining genomic stability."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its central role in DNA replication, MCM4 has significant implications in human disease. Mutations in MCM4 that reduce its function have been linked to rare genetic syndromes characterized by growth retardation, adrenal insufficiency, and a selective deficiency of natural killer (NK) cells. Such mutations often result in genomic instability in patient cells, underscoring the importance of precise MCM4 function for proper cell proliferation and immune cell development. In certain viral infections, for example during Epstein–Barr virus lytic replication, altered phosphorylation of MCM4 contributes to viral control of host DNA synthesis and cell cycle progression, while chemical agents that damage DNA can trigger checkpoint pathways involving MCM4 downregulation and consequent cell cycle arrest."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMCM4 is also emerging as an important biomarker in cancer, with its expression levels correlating with proliferative activity and clinical outcome. Elevated expression of MCM4 has been noted in a variety of malignancies—including melanoma, lung, breast, esophageal, laryngeal, and gastric cancers—as well as in hepatocellular carcinoma, where high levels are associated with aggressive tumor behavior and poor prognosis. In contrast, certain cancer models have demonstrated that reduced MCM4 expression or mutations that impair the helicase activity of the MCM complex can compromise DNA replication fidelity, contributing to genomic instability and altered cell proliferation. Moreover, transcriptomic studies in three‐dimensional cultures have identified decreased MCM4 expression as part of a dormancy signature in tumor cells, suggesting that modulation of MCM4 levels may also influence cancer cell quiescence and therapeutic resistance."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hisao Masai, Chika Taniyama, Keiko Ogino, et al. 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