{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n CNTNAP4, also known as Caspr4, is a multifunctional member of the neurexin superfamily whose roles extend across neural development, synaptic organization, and even non‐neuronal processes. In the brain, CNTNAP4 is highly enriched in developing interneurons where it is predominantly localized presynaptically. Its normal function is critical for proper GABAergic output from parvalbumin‐positive basket cells, and loss of CNTNAP4 activity results in reduced inhibitory drive together with enhanced dopaminergic release in key regions such as the nucleus accumbens, leading to altered sensory–motor gating and behavioral changes relevant to neuropsychiatric disease."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In neural progenitor cells, CNTNAP4 also plays an important role in controlling the balance between proliferation and differentiation; here, diminished CNTNAP4 expression promotes precursor proliferation while its overexpression drives neuronal differentiation in a manner that depends on the PDZ domain‐mediated interaction with LNX2, potentially linking CNTNAP4 dysregulation to autism spectrum disorders."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Moreover, functional studies in epilepsy models have shown that manipulation of CNTNAP4 levels can modulate neuronal excitability by altering the membrane localization of GABA_A receptor subunits, thereby influencing seizure susceptibility."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Altered CNTNAP4 expression has further been implicated in mood disorders, with lower levels observed in the cerebrospinal fluid of patients with major depressive disorder, suggesting that CNTNAP4–mediated synaptic integrity may be linked to affective regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In addition, genomic studies have identified CNV deletions in intronic regions of CNTNAP4 that are associated with reduced longevity and increased risk for aging‐related cognitive impairment as well as Alzheimer’s and Parkinson’s diseases, highlighting a potential role of CNTNAP4 in healthy brain aging."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Outside of traditional synaptic contexts, CNTNAP4 interacts with signaling molecules such as the Tiam1 PDZ domain to participate in cell adhesion and migration processes"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", is incorporated into gene expression signatures of castration-recurrent prostate cancer"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ", and functions as a receptor for Nell-1 to regulate osteogenesis during skeletal development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Collectively, these findings illustrate that CNTNAP4 is a critical regulator of synaptic connectivity and neural circuit function whose dysregulation may contribute to a spectrum of neurological, psychiatric, and systemic disorders, thereby offering a promising target for therapeutic intervention.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "T Karayannis, E Au, J C Patel, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Cntnap4 differentially contributes to GABAergic and dopaminergic synaptic transmission."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nature (2014)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/nature13248"}], "href": "https://doi.org/10.1038/nature13248"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "24870235"}], "href": "https://pubmed.ncbi.nlm.nih.gov/24870235"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Soha Ashrafi, J Nicholas Betley, John D Comer, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Neuronal Ig/Caspr recognition promotes the formation of axoaxonic synapses in mouse spinal cord."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Neuron (2014)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.neuron.2013.10.060"}], "href": "https://doi.org/10.1016/j.neuron.2013.10.060"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "24411736"}], "href": "https://pubmed.ncbi.nlm.nih.gov/24411736"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Feng-Ting Yin, Toshitaka Futagawa, Di Li, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Caspr4 interaction with LNX2 modulates the proliferation and neuronal differentiation of mouse neural progenitor cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Stem Cells Dev (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1089/scd.2014.0261"}], "href": "https://doi.org/10.1089/scd.2014.0261"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "25279559"}], "href": "https://pubmed.ncbi.nlm.nih.gov/25279559"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Yafei Shangguan, Xin Xu, Baigalimaa Ganbat, et al. "}, {"type": "b", "children": [{"type": "t", "text": "CNTNAP4 Impacts Epilepsy Through GABAA Receptors Regulation: Evidence From Temporal Lobe Epilepsy Patients and Mouse Models."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cereb Cortex (2018)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/cercor/bhx215"}], "href": "https://doi.org/10.1093/cercor/bhx215"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "28968899"}], "href": "https://pubmed.ncbi.nlm.nih.gov/28968899"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Mhd Rami Al Shweiki, Patrick Oeckl, Petra Steinacker, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Proteomic analysis reveals a biosignature of decreased synaptic protein in cerebrospinal fluid of major depressive disorder."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Transl Psychiatry (2020)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/s41398-020-0825-7"}], "href": "https://doi.org/10.1038/s41398-020-0825-7"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "32398672"}], "href": "https://pubmed.ncbi.nlm.nih.gov/32398672"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Leonid Iakoubov, Malgorzata Mossakowska, Malgorzata Szwed, et al. "}, {"type": "b", "children": [{"type": "t", "text": "A common copy number variation (CNV) polymorphism in the CNTNAP4 gene: association with aging in females."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS One (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pone.0079790"}], "href": "https://doi.org/10.1371/journal.pone.0079790"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "24223195"}], "href": "https://pubmed.ncbi.nlm.nih.gov/24223195"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "Tyson R Shepherd, Suzi M Klaus, Xu Liu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The Tiam1 PDZ domain couples to Syndecan1 and promotes cell-matrix adhesion."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Mol Biol (2010)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.jmb.2010.03.047"}], "href": "https://doi.org/10.1016/j.jmb.2010.03.047"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20361982"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20361982"}]}, {"type": "r", "ref": 8, "children": [{"type": "t", "text": "Indranil Chattopadhyay, Jianmin Wang, Maochun Qin, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Src promotes castration-recurrent prostate cancer through androgen receptor-dependent canonical and non-canonical transcriptional signatures."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Oncotarget (2017)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.18632/oncotarget.14401"}], "href": "https://doi.org/10.18632/oncotarget.14401"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "28055971"}], "href": "https://pubmed.ncbi.nlm.nih.gov/28055971"}]}, {"type": "r", "ref": 9, "children": [{"type": "t", "text": "C Li, X Zhang, Z Zheng, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Nell-1 Is a Key Functional Modulator in Osteochondrogenesis and Beyond."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Dent Res (2019)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1177/0022034519882000"}], "href": "https://doi.org/10.1177/0022034519882000"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "31610747"}], "href": "https://pubmed.ncbi.nlm.nih.gov/31610747"}]}]}]}