{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n CHD7 is an ATP‐dependent chromatin remodeling enzyme that plays a central role in regulating gene expression during embryonic development. It is essential for activating gene networks that control the formation, migration, and differentiation of multipotent neural crest cells, which contribute to the development of craniofacial structures, the heart, inner ear, and other organs. In particular, CHD7 helps establish and fine‐tune enhancer activity by interacting with chromatin regulators, such as the PBAF complex, and by cooperating with key transcription factors like Sox2—thereby functioning as a “transcriptional rheostat” that modulates the expression of genes critical to tissue and organ development."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": " \n Mutations in CHD7, which are typically loss‐of-function and often result in haploinsufficiency, represent the major genetic cause of CHARGE syndrome—a condition characterized by ocular coloboma, heart defects, choanal atresia, semicircular canal abnormalities, growth retardation, and various craniofacial anomalies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "7"}]}, {"type": "t", "text": " \n Furthermore, milder allelic variants of CHD7 mutations have been identified in patients with conditions such as idiopathic hypogonadotropic hypogonadism and Kallmann syndrome, indicating that CHD7 dosage and activity are critical for a broad spectrum of developmental processes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " \n Detailed mutation analyses across diverse patient cohorts further demonstrate that mutations in CHD7 are widely distributed along the gene and are associated with considerable clinical variability, which may reflect its multifaceted role in orchestrating developmental gene expression programs."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " \n Finally, early developmental expression studies highlight CHD7’s activity in tissues affected in CHARGE syndrome—including the inner ear, central nervous system, and structures derived from the neural crest—further reinforcing its pivotal function in embryogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ruchi Bajpai, Denise A Chen, Alvaro Rada-Iglesias, et al. 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