{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Immunoglobulin superfamily member 9B (IGSF9B) is an evolutionarily conserved, brain‐specific cell adhesion molecule that plays multiple roles in the nervous system. In the rodent brain, IGSF9B is selectively enriched at inhibitory synapses of GABAergic interneurons, where it organizes a distinct subsynaptic domain and cooperates with other synaptic organizers—such as neuroligin‐2 via S‐SCAM—to promote inhibitory synapse development and maintenance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Epigenomic analyses further reveal that IGSF9B is among a set of synaptic genes showing broad H3K4me3 modifications in prefrontal cortical neurons, implicating it in the regulation of synaptic function and neurotransmission."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Genetic association studies have linked IGSF9B variants with neuropsychiatric phenotypes; for instance, a schizophrenia‐associated single nucleotide polymorphism in IGSF9B correlates with the severity of negative symptoms"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ", and another variant is associated with a benign disease course in multiple sclerosis, with IGSF9B protein expression detectable in astrocytes and microglia."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " In the context of affective disorders and anxiety circuitry, deletion studies indicate that IGSF9B is a key regulator of inhibition—especially within the amygdala—suggesting that its modulation may normalize anxiety‐related behaviors."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Moreover, IGSF9B interacts with proteins such as Prickle2 to influence the organization of the axon initial segment and regulate neuronal excitability, processes that have implications for disorders including autism spectrum disorder and epilepsy."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " Its expression is also subject to activity‐dependent regulation; for example, visual experience drives IGSF9B expression in upper-layer glutamatergic neurons in the primary visual cortex, where it is required for the normal development of binocular responses."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " In addition, miRNA-binding site variants in IGSF9B have been implicated in Parkinson’s disease, highlighting its broader role in neurodegenerative processes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Finally, reviews of IGSF9 and its Drosophila homolog Turtle underscore its conserved functions in mediating cell adhesion, neurite outgrowth, axon guidance, and synapse maturation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jooyeon Woo, Seok-Kyu Kwon, Jungyong Nam, et al. 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