{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent genetic studies have implicated the NKAPL gene, which encodes an NF‑κB activating protein‐like factor, in the etiology of schizophrenia. Genome‑wide association analyses in Han Chinese populations have identified a notable non‑synonymous SNP (rs1635) within NKAPL that is significantly associated with schizophrenia risk, with expression in the developing mouse brain further supporting a role in neurodevelopment. These observations suggest that NKAPL may influence the pathogenesis of schizophrenia by affecting neuronal differentiation or signaling during brain maturation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its association with neuropsychiatric disorders, NKAPL (also referred to as Nkapl) plays a critical role in mammalian spermatogenesis. Recent functional studies have demonstrated that NKAPL acts as a germ cell‑specific transcriptional suppressor within the Notch signaling pathway. By interacting with essential components of the Notch corepressor complex—including CIR, HDAC3, and CSL—NKAPL modulates the balance between spermatogonial stem cell maintenance and differentiation. Disruption or deletion of Nkapl results in spermatogenic arrest at the pachytene spermatocyte stage along with increased apoptosis, underscoring its indispensability for normal germ cell development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in the nervous system and reproductive biology, NKAPL variants have also been implicated in immune regulation. Fine‑mapping studies have identified the NKAPL locus as a potential risk factor for rheumatoid arthritis, while other investigations have linked NKAPL polymorphisms (including rs1635) to variations in circulating levels of soluble intercellular adhesion molecule‑1 (sICAM1), a key mediator in atherogenesis. Collectively, these findings suggest that altered NKAPL function may contribute to a spectrum of disorders through its influence on inflammatory and immune‑related pathways."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Wei-Hua Yue, Hai-Feng Wang, Liang-Dan Sun, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Resequencing and association study of the NFKB activating protein-like gene (NKAPL) in schizophrenia."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Schizophr Res (2014)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.schres.2014.05.038"}], "href": "https://doi.org/10.1016/j.schres.2014.05.038"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "24972756"}], "href": "https://pubmed.ncbi.nlm.nih.gov/24972756"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Zhiqiang Wang, Bixiu Yang, Yansong Liu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Further evidence supporting the association of NKAPL with schizophrenia."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Neurosci Lett (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.neulet.2015.08.023"}], "href": "https://doi.org/10.1016/j.neulet.2015.08.023"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26297123"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26297123"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Hidenobu Okuda, Hiroshi Kiuchi, Tetsuya Takao, et al. "}, {"type": "b", "children": [{"type": "t", "text": "A novel transcriptional factor Nkapl is a germ cell-specific suppressor of Notch signaling and is indispensable for spermatogenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS One (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pone.0124293"}], "href": "https://doi.org/10.1371/journal.pone.0124293"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "25875095"}], "href": "https://pubmed.ncbi.nlm.nih.gov/25875095"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Gang Xie, Yue Lu, Ye Sun, et al. 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