{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n The CNTNAP3 gene family, which includes isoforms commonly referred to as Caspr3 or CNTNAP3 (and in one case CNTNAP3B), encodes neural cell adhesion molecules that play multifaceted roles in both the nervous system and other tissues. In the brain, CNTNAP3 proteins contribute to the regulation of synapse development and function. Disruption of CNTNAP3 in mice leads to impaired motor learning, altered dorsal striatal activity, and behavioral abnormalities relevant to autism spectrum disorder and related neuropsychiatric conditions, suggesting that proper CNTNAP3 expression is critical for the establishment and maintenance of functional neural networks."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition, interactions between CNTNAP3 and extracellular ligands—such as the demonstrated binding with neuregulin 3—suggest a role in modulating dopamine axonal signaling and synaptic plasticity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Outside the central nervous system, genomic studies have implicated alterations at the CNTNAP3 locus in testicular germ cell tumor predisposition"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", and CNTNAP3 expression has been identified as a marker for brown adipocyte progenitors, suggesting an involvement in metabolic differentiation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Furthermore, a circular RNA derived from CNTNAP3 has been shown to act in a tumor‐suppressive manner in esophageal squamous cell carcinoma by modulating p53 expression through miRNA sponging"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ", and CNTNAP3 has recently been linked to the regulation of autophagy, where its upregulation of ATG16L1 promotes autophagic vacuole formation in Crohn’s disease contexts."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Finally, the CNTNAP3B variant has been found to be upregulated in chronic fibrosing idiopathic interstitial pneumonia, implicating it as a potential player in processes such as extracellular matrix interactions and tissue remodeling during disease pathogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, CNTNAP3 proteins—including the CNTNAP3B isoform—function as key molecular components in neural development, synaptic differentiation, and network modulation, while also influencing tumor suppression, autophagy, and cellular differentiation in non‐neuronal tissues. These diverse roles underline the potential of CNTNAP3 as a target for further biomedical research across neurological, oncological, and inflammatory conditions.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Haruna Hirata, Aki Takahashi, Yasushi Shimoda, et al. 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