{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMMS19 is a multifunctional protein that plays a central role in maintaining genomic stability by acting as a key component of the cytosolic iron‐sulfur (Fe–S) cluster assembly (CIA) machinery. It functions as an adapter that bridges early CIA factors to a subset of client apoproteins required for methionine biosynthesis, DNA replication, repair, and telomere maintenance. This essential role in Fe–S cluster insertion helps explain the DNA damage sensitivity and nuclear genome instability observed when MMS19 function is compromised."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its basic function in Fe–S cluster maturation, MMS19 also serves as a molecular platform mediating interactions between multiple proteins. It forms complexes with CIA proteins such as CIAO1, MIP18, and IOP1, and binds nuclear Fe–S proteins including DNA repair factors like XPD as well as replication proteins. Structural and biochemical studies have revealed that MMS19 directly bridges client proteins with targeting factors and even associates with proteins such as POLE1 and ANT2, indicating its involvement in processes ranging from nucleotide excision repair to proper chromosome segregation during mitosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMMS19 exists as multiple splice variants that appear to have functionally distinct domains. Notably, its C-terminal HEAT repeat domain is critical for both nucleotide excision repair and RNA polymerase II transcription, while different N-terminal regions can modulate the balance between these processes. This domain-specific functionality, first identified through studies of yeast MMS19 orthologs and later confirmed in mammals, underscores its multifaceted role in DNA metabolism."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nClinical studies further implicate MMS19 (or its homolog MMS19L) in human disease. Genetic polymorphisms in MMS19L are associated with differential responses to chemotherapy and variations in overall survival in cancers such as osteosarcoma and ovarian carcinoma. Additionally, aberrant expression of MMS19 has been linked to esophageal squamous cell carcinoma and, through its transcriptional upregulation by c-MYC, to enhanced proliferation, metastasis, and chemoresistance in bladder cancer. These findings, together with observations of inherited disorders of the CIA pathway involving MMS19, highlight its importance in both genome maintenance and cancer pathogenesis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence also indicates a role for MMS19 in mitochondrial genome maintenance. Recent findings demonstrate that MMS19 localizes to the inner mitochondrial membrane and contributes to the repair of oxidative DNA damage in mitochondria – a function that may be mediated through interactions with proteins involved in ATP metabolism such as ANT2."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Oliver Stehling, Ajay A Vashisht, Judita Mascarenhas, et al. 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