{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMSX1 is a homeobox transcription factor that plays a pivotal role in craniofacial and dental development. Numerous studies have demonstrated that its normal function is essential for proper palate formation, tooth morphogenesis, and jaw osteogenesis. Disruption of MSX1 activity—whether by missense, nonsense, or splicing mutations—impairs its DNA‐binding capacity or interferes with its precise nuclear localization, leading to clinical phenotypes such as non‐syndromic cleft lip and/or palate, oligodontia, and other craniofacial malformations. Animal models and human genetic analyses have further elucidated that MSX1 is required in neural crest–derived mesenchyme for osteogenic differentiation, partly through regulation of key downstream factors like Runx2 and interactions with BMP signaling pathways."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its developmental roles, MSX1 functions as a transcriptional regulator whose activity strongly depends on its nuclear localization and interaction with cofactors. Its homeodomain is critical for binding specific DNA sequences and repressing target genes. For example, MSX1 has been shown to inhibit myogenic differentiation by suppressing the expression of myogenic regulators such as MyoD, and it can stabilize wild‐type p53 to promote apoptosis in tumor cells. MSX1 also directly binds to regulatory elements of genes like DKK1, thereby modulating key pathways linked to epithelial–mesenchymal transition."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMSX1 further exhibits roles beyond classical craniofacial and odontogenic differentiation. It participates in non‐canonical pathways such as innate immune signaling, where upon viral infection it translocates from the nucleus to the cytoplasm—assisting in the assembly of TBK1 complexes that are critical for antiviral responses. In developmental contexts, interactions between MSX1 and members of the DLX gene family form regulatory loops that contribute to limb patterning. Moreover, aberrant expression of MSX1 can reprogram melanoma cells toward a neural crest–like state, thereby enhancing their invasive potential."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "18", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nA wealth of genetic association studies and mutation analyses further underscores the multifaceted contributions of MSX1 to human disease. Population‐based analyses and transmission disequilibrium tests have identified various MSX1 polymorphisms and rare mutations that modify the risk of orofacial clefts, tooth agenesis, and even influence disease phenotypes in other conditions. In several cohorts, interactions between MSX1 variants and environmental factors—as well as epistatic relationships with other developmental genes (such as TGFB3, PAX9, and FOXE1)—have been documented. These comprehensive genetics studies highlight how both coding and regulatory changes in the MSX1 gene can disrupt its function, thereby altering developmental cascades and contributing to the complexity of craniofacial and dental anomalies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "P A Jezewski, A R Vieira, C Nishimura, et al. 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