{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nP2X receptors containing the P2X2 subunit (encoded by P2RX2) are ATP‐gated, cation‐selective ion channels that predominantly assemble as trimers. Multiple studies using biochemical cross‐linking, atomic force microscopy, and concatemer expression have established the trimeric architecture of these receptors, with ATP binding occurring at intersubunit crevices. Site‐directed mutagenesis has further shown that conserved extracellular residues and motifs (including key lysine, asparagine, and arginine residues as well as FT and NFR motifs) are essential for proper ATP binding and channel gating, and that only two intact binding sites per trimer are sufficient for receptor activation. In addition, comparisons of the closed and desensitized states highlight distinct conformational rearrangements that underlie channel opening and desensitization."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic and functional studies have implicated P2RX2 in auditory function, with mutations in this gene causing a dominantly inherited, progressive sensorineural hearing loss (DFNA41). Analyses in families and animal models have identified pathogenic variants—such as p.V60L, p.Gly353Arg, and other deleterious alleles—that impair ATP‐evoked currents or alter channel gating. These deficits compromise endolymphatic ion homeostasis and auditory neurotransmission, thereby increasing vulnerability to noise-induced and age-related hearing loss."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "15"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond functioning as homomeric channels, P2X2 subunits are integral components of heteromeric receptors—most notably with P2X3 and P2X6 subunits. Experimental approaches using mutant subunit co-expression and concatenated constructs have revealed that heteromeric P2X2/3 receptors can form in variable stoichiometries, with the relative subunit composition directly influencing channel pharmacology and ATP sensitivity. Moreover, dynamic interactions with other receptor systems, such as transient complexes with GABA(A) receptors and co-trafficking mechanisms, underscore the role of P2X2 in modulating synaptic signaling."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nP2X2 receptor function is further fine-tuned by diverse regulatory mechanisms. The neuronal calcium sensor VILIP1, for instance, binds to P2X2 receptors to modulate ATP sensitivity, peak current response, membrane mobility, and surface expression. In addition, specific intracellular cysteine residues (such as Cys430) act as redox sensors—mediating modulation by oxidative agents like mercury and hydrogen peroxide—while zinc coordination at intersubunit interfaces contributes an additional level of control over receptor activity. Such regulatory inputs also extend to the modulation of synaptic plasticity, wherein P2X2 activation influences the trafficking and internalization of AMPA receptors, ultimately affecting neuronal excitability."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence also points to roles for P2RX2 beyond the auditory system. Integrated analyses in oncology have identified P2RX2 as a hub gene linked to calcium signaling pathways, with its expression correlating with immune cell infiltration and clinical outcomes in prostate cancer. Furthermore, in the context of neurodegeneration, amyloid-β oligomers have been shown to upregulate P2X2 receptor levels, suggesting that aberrant P2X2-mediated signaling may contribute to the pathophysiology of Alzheimer’s disease. These findings highlight the multifaceted contributions of P2X2 receptors to both normal physiology and disease states."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Armaz Aschrafi, Sven Sadtler, Cristina Niculescu, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Atomic force microscopy imaging demonstrates that P2X2 receptors are trimers but that P2X6 receptor subunits do not oligomerize."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M412265200"}], "href": "https://doi.org/10.1074/jbc.M412265200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15657042"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15657042"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Jonathan A Roberts, Helen R Digby, Madina Kara, et al. 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