{"gene":"ITSN2","run_date":"2026-06-10T01:55:23","timeline":{"discoveries":[{"year":2000,"finding":"ITSN2 was characterized as a new multimodular human protein involved in clathrin-mediated endocytosis. It has two isoforms generated by alternative splicing: a short isoform with two EH domains, a coiled-coil region, and five SH3 domains, and a long isoform containing additional DH, PH, and C2 domains suggesting GEF activity for Rho-like GTPases. Overexpression of ITSN2 isoforms inhibits transferrin internalization, and ITSN2 co-localizes with Eps15, a component of the endocytic machinery.","method":"cDNA characterization, domain analysis, transferrin internalization assay, immunofluorescence co-localization","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional assay (transferrin inhibition) plus co-localization, single lab, multiple methods","pmids":["10922467"],"is_preprint":false},{"year":2002,"finding":"KIAA1256 (ITSN2) was identified as a guanine nucleotide exchange factor (GEF) for Cdc42 using a FRET-based single-molecule probe (Raichu-Cdc42) assay in living cells.","method":"FRET-based GTPase activity assay (Raichu-Cdc42 probe) in live cells","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live-cell FRET-based functional GEF assay, single lab, but direct functional measurement","pmids":["12192056"],"is_preprint":false},{"year":2007,"finding":"The K15 protein of Kaposi's sarcoma-associated herpesvirus selectively binds the SH3-C domain of ITSN2 via a conserved PPLP proline-rich motif in its cytoplasmic tail. This interaction was identified by mass spectrometry, domain and peptide arrays, and surface plasmon resonance, and confirmed by co-localization of K15 and ITSN2 to discrete compartments within B cells.","method":"Mass spectrometry, domain/peptide arrays, surface plasmon resonance, co-immunoprecipitation, immunofluorescence co-localization","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal in vitro and cellular methods (SPR, arrays, MS, co-IP, co-localization) in one study confirming the interaction","pmids":["17696407"],"is_preprint":false},{"year":2011,"finding":"The DH-PH tandem of ITSN2-L acts as a nucleotide exchange factor for Cdc42 during Xenopus early embryonic development. Overexpression of this domain in embryos caused hyperpigmentation and gastrulation failure affecting the actin cytoskeleton, phenotypes dependent on Cdc42 (partially rescued by dominant-negative Cdc42 and phenocopied by constitutively active Cdc42).","method":"Overexpression of functional domains in Xenopus embryos, genetic epistasis with dominant-negative and constitutively active Cdc42, phenotypic analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis with GTPase mutants and domain dissection in a vertebrate model, single lab","pmids":["21530493"],"is_preprint":false},{"year":2012,"finding":"ITSN2 binds Eps8 protein via its coiled-coil domain interacting with amino acids 260–306 of Eps8, and overexpression of ITSN2 promotes lysosomal degradation of Eps8. The interaction was demonstrated by yeast two-hybrid, co-immunoprecipitation, co-localization, and GST pull-down assays.","method":"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, immunofluorescence, protein stability assay with lysosome inhibitor","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal binding assays plus functional degradation assay, single lab","pmids":["22449706"],"is_preprint":false},{"year":2012,"finding":"ITSN2 is required for GM-CSF receptor (GMR)-mediated activation of JAK2 at clathrin-coated structures (CCSs). Knockdown of ITSN2 attenuated GMR-mediated JAK2 activation, and an ITSN2-non-binding mutant of GMR that failed to target to CCSs also failed to activate JAK2. Ligand treatment enhanced JAK2/GMR association at CCSs and induced a conformational change in JAK2 required for CCS-localized CK2-mediated activation.","method":"RNAi knockdown, dominant-negative dynamin, receptor binding mutants, co-immunoprecipitation, subcellular fractionation/co-localization","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function knockdown plus receptor mutant approach with defined signaling readout, single lab","pmids":["22935703"],"is_preprint":false},{"year":2013,"finding":"ITSN2 expression is induced >25-fold by the ING1a tumor suppressor during cellular senescence. ITSN2 overexpression independently induces p16 and p57KIP2 cyclin-dependent kinase inhibitors that block Rb inactivation. Knockdown of ITSN2 blocks ING1a-induced senescence, establishing ITSN2 as a major downstream effector of ING1a-induced senescence via the Rb-E2F pathway. ITSN2 is also induced in normally senescing cells.","method":"Gene expression profiling, ITSN2 overexpression, siRNA knockdown, senescence assays (β-galactosidase, morphology, SAHF), Western blotting for p16/p57/Rb","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain- and loss-of-function experiments with specific pathway markers, independently verified in normally senescing cells","pmids":["23472054"],"is_preprint":false},{"year":2013,"finding":"ITSN2 SH3 domains bind the same proline-rich ligands as ITSN1, but ITSN2 (unlike ITSN1 short isoform) is specifically tyrosine-phosphorylated in various cell lines, and EGF stimulation enhances this phosphorylation, enabling recognition of ITSN2 by SH2 domains of Fyn, Fgr, Abl1, PI3K regulatory subunit, Grb2, Crk, and PLCγ. Endogenous ITSN1 and ITSN2 co-localize and form a complex in cells.","method":"Co-immunoprecipitation, SH3 domain binding assays, phosphorylation analysis, SH2 domain array/binding assays, immunofluorescence","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding and phosphorylation assays in cells, single lab, several orthogonal methods","pmids":["23936226"],"is_preprint":false},{"year":2015,"finding":"ITSN2 (and ITSN1) interact with the actin-regulating protein WIP via the SH3 domains of ITSNs and the proline-rich region of WIP. Endogenous ITSN1 and ITSN2 localize to invadopodia of MDA-MB-231 breast cancer cells, and ITSN1, WIP, and N-WASP can form a trimeric complex in cells.","method":"Co-immunoprecipitation, GST pull-down (SH3 domain mapping), immunofluorescence in invasive cancer cell lines","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and pull-down with domain mapping plus cellular localization, single lab","pmids":["25797047"],"is_preprint":false},{"year":2017,"finding":"ITSN2 depletion in mouse oocytes causes delayed meiotic resumption, defective cytokinesis, abnormal spindle, misaligned chromosomes, and loss of cortical actin cap. ITSN2 depletion reduces Cdc42 activity, and forced expression of dominant-positive Cdc42 partially rescues actin cap formation. The downstream effectors WASP and Arp2 are mislocalized upon ITSN2 knockdown, supporting a model in which ITSN2 acts upstream of Cdc42 to regulate WASP/Arp2/3 and actin dynamics in oocyte meiosis.","method":"Morpholino-mediated knockdown, dominant-positive Cdc42 rescue, small molecule ZCL278 (ITSN-Cdc42 interaction inhibitor), immunofluorescence, Cdc42 activity assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with GTPase epistasis rescue, pharmacological inhibition, multiple cellular readouts in single rigorous study","pmids":["28626024"],"is_preprint":false},{"year":2017,"finding":"ITSN2 is a target of aldosterone-regulated miR-27a/b in the distal kidney nephron. miR-27a/b binds the 3'-UTR of ITSN2 mRNA; aldosterone stimulation decreases ITSN2 mRNA and protein. Depletion of ITSN2 increases ENaC-mediated Na+ transport, while ITSN2 overexpression reduces ENaC function, demonstrating that ITSN2 negatively regulates epithelial sodium channel activity.","method":"3'-UTR reporter assay, siRNA knockdown, overexpression, ENaC electrophysiology (Na+ transport assay), Western blot","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional ENaC assay with both gain- and loss-of-function, plus miRNA target validation, single lab","pmids":["27636893"],"is_preprint":false},{"year":2017,"finding":"Mammalian verprolin CR16 forms complexes with ITSN1 and ITSN2 in human cell lines. CR16 modulates ITSN association with β-actin, and overexpressed CR16 promotes co-localization of ITSN1 with F-actin in MCF-7 cells.","method":"Co-immunoprecipitation, immunofluorescence, Western blot","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP/co-localization, single lab, no functional rescue","pmids":["28161632"],"is_preprint":false},{"year":2018,"finding":"ITSN2-deficient mice show increased mortality during primary influenza infection, incomplete protection after flu vaccination, reduced germinal centre formation, and impaired antibody responses. These defects are intrinsic to the B cell compartment. In vivo, ITSN2-deficient B cells show reduced SLAM, CD84, and ICOSL expression, diminished ability to form long-term T cell conjugates, reduced proliferation, and impaired germinal centre differentiation, demonstrating ITSN2 as a key regulator of adaptive B cell immunity via Cdc42/WASp/WIP-dependent actin remodeling downstream of BCR engagement.","method":"ITSN2 knockout mice, viral infection, vaccination, flow cytometry, in vivo B-T cell conjugate assays, germinal centre analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO mouse with multiple specific immunological readouts, cell-intrinsic rescue experiments, rigorous controls","pmids":["29337666"],"is_preprint":false},{"year":2018,"finding":"Loss-of-function mutations in ITSN2 (along with ITSN1, MAGI2, TNS2, DLC1, CDK20) cause partially treatment-sensitive nephrotic syndrome (NS) in humans. ITSN1 and ITSN2 function as podocytic guanine nucleotide exchange factors for Cdc42, and patient-derived ITSN2 mutants show deficient GEF activity. Itsn2-L knockout mice recapitulate the mild NS phenotype. Knockdown of ITSN2 in podocytes reduces migration rate.","method":"Human genetic analysis, GEF activity assay with patient mutants, Itsn2-L knockout mouse model with NS phenotype, podocyte knockdown migration assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro GEF activity with patient mutants, KO mouse recapitulating human disease, cell migration assay, multiple orthogonal methods","pmids":["29773874"],"is_preprint":false},{"year":2018,"finding":"Inhibition of the ITSN2-Cdc42 interaction using the small molecule ZCL278 prevents porcine oocytes from completing meiosis, causes spindle defects, chromosomal congression failure, and impairs actin polymerization, supporting ITSN2 function upstream of Cdc42 in meiotic apparatus assembly.","method":"Small molecule inhibitor (ZCL278) targeting ITSN-Cdc42 interaction, spindle and chromosome immunofluorescence, actin staining","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological disruption of specific protein-protein interaction with multiple cellular readouts, single lab","pmids":["30478952"],"is_preprint":false},{"year":2019,"finding":"The DHPH domain of ITSN2 (together with ITSN1 and PLEKHG1) activates Cdc42 in primary human endothelial cells, whereas the isolated DH domain alone does not activate Cdc42, establishing that the PH domain is required for ITSN2 GEF activity toward Cdc42.","method":"Single-cell FRET measurements with Rho GTPase biosensors, overexpression of full-length and truncated GEF constructs in primary human endothelial cells","journal":"Small GTPases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative FRET-based GEF activity assay in primary human cells with domain dissection, single lab","pmids":["31469028"],"is_preprint":false},{"year":2020,"finding":"ITSN2 is phosphorylated following TCR stimulation in primary T cells, and gene inactivation of ITSN2 in primary lymphocytes using a fast-track approach impairs T-cell effector functions, demonstrating that ITSN2 regulates T-cell responses downstream of TCR engagement.","method":"Time-resolved phosphoproteomics, fast-track CRISPR gene inactivation in primary lymphocytes, T-cell effector function assays","journal":"Molecular systems biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomic identification plus primary cell loss-of-function with functional readout, single lab","pmids":["32618424"],"is_preprint":false},{"year":2020,"finding":"RhoU binds ITSN2 (but not ITSN1) via its N-terminal PxxP motif interacting with the SH3 domains of ITSN2. Silencing of ITSN2 (but not ITSN1) increases transferrin accumulation in early endosomes, indicating a defect in fast vesicle recycling. RhoU and ITSN2 co-localize on Rab4-positive fast recycling endosomes.","method":"Co-immunoprecipitation, siRNA knockdown, fluorescent transferrin uptake assay, immunofluorescence co-localization","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interaction mapping plus specific silencing with defined endosomal trafficking readout, single lab","pmids":["32737221"],"is_preprint":false},{"year":2021,"finding":"EPS15L1 and ITSN2 were validated as stable binding partners of both CBL and CBLB (ubiquitin E3 ligases) through biochemical assays (AP-MS and co-IP validation), placing ITSN2 in the EGFR signaling network.","method":"Affinity purification–mass spectrometry (AP-MS), biochemical co-IP validation","journal":"Journal of proteome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single AP-MS with co-IP validation, no functional follow-up for ITSN2 specifically","pmids":["34134489"],"is_preprint":false},{"year":2021,"finding":"METTL3-mediated m6A modification targets Itsn2 mRNA in mouse oocytes to enhance its stability, and this stabilization influences oocyte meiosis. Loss of METTL3 in oocytes (Gdf9-Cre) reduces Itsn2 expression and is associated with defective oocyte maturation.","method":"Oocyte-specific Mettl3 knockout, MeRIP-seq (m6A immunoprecipitation sequencing), RNA-seq, mRNA stability assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A mapping combined with KO phenotype and mRNA stability data, single lab","pmids":["34689175"],"is_preprint":false},{"year":2023,"finding":"Deletion of both ITSN1 and ITSN2 in mice leads to ASD/OCD-like behavioral alterations and defective cortico-striatal neurotransmission. The striatum is decreased in size, striatal neurons show reduced dendritic complexity and spine density, and NMDA receptor currents are reduced due to postsynaptic NMDA receptor depletion, establishing ITSN1/2 as regulators of cortico-striatal plasticity and NMDA receptor maintenance.","method":"ITSN1/2 double knockout mice, behavioral testing (ASD/OCD-like behaviors), morphological analysis, electrophysiology (NMDA receptor currents), immunostaining","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — double KO with multiple orthogonal readouts (behavior, morphology, electrophysiology, receptor quantification), single lab, rigorous study","pmids":["37603735"],"is_preprint":false},{"year":2026,"finding":"RBM15B promotes m6A modification of ITSN2 mRNA and, through the m6A reader IGF2BP1, stabilizes ITSN2 mRNA in hepatocellular carcinoma (HCC), enhancing ITSN2 expression. ITSN2 depletion rescues the tumor-promoting phenotype induced by RBM15B overexpression, establishing a RBM15B-IGF2BP1-ITSN2 regulatory axis in HCC.","method":"MeRIP-seq, RNA immunoprecipitation (RIP)-qRT-PCR, rescue assays (cell proliferation and migration), in vitro and in vivo tumor assays","journal":"Journal of cancer research and clinical oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-qRT-PCR validation of m6A-IGF2BP1-ITSN2 axis plus rescue functional assays, single lab","pmids":["41795047"],"is_preprint":false}],"current_model":"ITSN2 is a multi-domain scaffold/adaptor protein that functions as a guanine nucleotide exchange factor (GEF) for Cdc42 via its DH-PH domains (requiring the PH domain for activity), participates in clathrin-mediated endocytosis and fast endosomal recycling (through SH3-domain-mediated interactions with dynamin, WIP, RhoU, and Eps8), regulates actin cytoskeletal dynamics and meiotic division in oocytes through the Cdc42-WASP-Arp2/3 pathway, mediates B cell adaptive immunity and T cell effector functions, is required in podocytes as a Cdc42 GEF for normal kidney glomerular function, acts downstream of ING1a to induce cellular senescence via the Rb-E2F pathway, and is subject to m6A-mediated mRNA stabilization (by METTL3/RBM15B-IGF2BP1) and miRNA-27-mediated repression that regulates ENaC-dependent Na+ transport."},"narrative":{"mechanistic_narrative":"ITSN2 is a multimodular scaffold/adaptor that couples membrane trafficking to actin cytoskeletal remodeling by functioning as a guanine nucleotide exchange factor (GEF) for the Rho-family GTPase Cdc42 [PMID:12192056, PMID:21530493]. Generated as short and long splice isoforms, the protein combines EH domains, a coiled-coil, and SH3 domains with an additional DH-PH-C2 module in the long isoform; GEF activity toward Cdc42 resides in the DH-PH tandem and strictly requires the PH domain, as the isolated DH domain is inactive [PMID:10922467, PMID:31469028]. Through its SH3 domains ITSN2 engages proline-rich ligands including WIP and RhoU, and via its coiled-coil it binds Eps8 and promotes its lysosomal degradation, linking the protein to clathrin-mediated endocytosis, Cdc42-WASP/Arp2/3-driven actin assembly, and RhoU-dependent fast endosomal recycling on Rab4-positive endosomes [PMID:22449706, PMID:25797047, PMID:32737221]; ITSN2 overexpression inhibits transferrin internalization and it co-localizes with the endocytic component Eps15 [PMID:10922467]. This Cdc42-actin axis underlies its physiological roles: ITSN2 is required upstream of Cdc42-WASP-Arp2/3 for cortical actin cap formation, spindle assembly, and meiotic progression in oocytes [PMID:28626024, PMID:30478952], and supports adaptive immunity, driving germinal-center B-cell responses through Cdc42/WASp/WIP-dependent actin remodeling downstream of the B-cell receptor and regulating T-cell effector functions downstream of TCR engagement [PMID:29337666, PMID:32618424]. ITSN2 also acts as a podocyte Cdc42 GEF essential for glomerular function, and loss-of-function mutations that impair its GEF activity cause partially treatment-sensitive nephrotic syndrome in humans, recapitulated by Itsn2-L knockout mice [PMID:29773874]. Beyond trafficking and actin, ITSN2 is a major downstream effector of ING1a-induced cellular senescence, inducing the cyclin-dependent kinase inhibitors p16 and p57KIP2 to block Rb inactivation [PMID:23472054], negatively regulates ENaC-mediated Na+ transport under aldosterone/miR-27 control [PMID:27636893], and together with ITSN1 maintains cortico-striatal NMDA receptor function and plasticity [PMID:37603735]. Its expression is tuned post-transcriptionally by m6A-mediated mRNA stabilization via METTL3 and an RBM15B-IGF2BP1 axis [PMID:34689175, PMID:41795047].","teleology":[{"year":2000,"claim":"Established ITSN2 as a multidomain endocytic protein and predicted, from its long-isoform DH-PH-C2 architecture, that it acts as a GEF for Rho-family GTPases.","evidence":"cDNA/domain characterization, transferrin internalization assay, and co-localization with Eps15","pmids":["10922467"],"confidence":"Medium","gaps":["GEF activity inferred from domain content, not yet measured","Which Rho GTPase substrate not identified"]},{"year":2002,"claim":"Identified Cdc42 as the GTPase substrate of ITSN2, converting the domain-based prediction into a measured catalytic activity.","evidence":"FRET-based Raichu-Cdc42 GEF activity assay in living cells","pmids":["12192056"],"confidence":"Medium","gaps":["Domain requirements for activity not dissected","Physiological context of Cdc42 activation untested"]},{"year":2011,"claim":"Placed ITSN2 GEF activity in a developmental and cytoskeletal context, showing the DH-PH tandem activates Cdc42 to control actin and morphogenesis in vivo.","evidence":"Domain overexpression in Xenopus embryos with dominant-negative/constitutively active Cdc42 epistasis","pmids":["21530493"],"confidence":"Medium","gaps":["Endogenous requirement not tested (gain-of-function only)","Direct molecular partners in embryo unknown"]},{"year":2012,"claim":"Defined ITSN2 protein-protein interactions and signaling roles, linking it to Eps8 turnover and to receptor-proximal JAK2 activation at clathrin-coated structures.","evidence":"Yeast two-hybrid, co-IP, GST pull-down, lysosomal stability assay (Eps8); RNAi and receptor mutants (GMR/JAK2)","pmids":["22449706","22935703"],"confidence":"Medium","gaps":["Mechanism connecting GEF activity to Eps8 degradation unclear","Generality of JAK2 role across receptors untested"]},{"year":2013,"claim":"Revealed two distinct ITSN2 functions: a senescence-effector role downstream of ING1a via the Rb-E2F pathway, and isoform-specific tyrosine phosphorylation creating SH2-domain docking sites that distinguish ITSN2 from ITSN1.","evidence":"Reciprocal overexpression/knockdown with senescence markers (p16/p57/Rb); phosphorylation analysis and SH2 domain binding arrays","pmids":["23472054","23936226"],"confidence":"High","gaps":["How ITSN2 induces p16/p57 mechanistically not resolved","Functional consequence of each SH2-mediated interaction untested"]},{"year":2015,"claim":"Connected ITSN2 SH3 domains to actin machinery by demonstrating WIP binding and localization to invadopodia, embedding it in the Cdc42-WASP/Arp2/3 network.","evidence":"Co-IP, GST pull-down domain mapping, immunofluorescence in invasive cancer cells","pmids":["25797047"],"confidence":"Medium","gaps":["Functional requirement of ITSN2 at invadopodia not directly tested","Trimeric complex shown for ITSN1, not explicitly ITSN2"]},{"year":2017,"claim":"Demonstrated an endogenous, physiological requirement for ITSN2 as a Cdc42 GEF in oocyte meiosis, regulating actin cap formation, spindle, and chromosome alignment via WASP/Arp2/3, and identified miR-27/ENaC regulation in kidney.","evidence":"Morpholino knockdown with dominant-positive Cdc42 rescue and ZCL278 inhibitor (oocytes); 3'-UTR reporter, knockdown/overexpression with ENaC electrophysiology (kidney)","pmids":["28626024","27636893","28161632"],"confidence":"High","gaps":["Direct GEF measurement in oocytes not performed","CR16 interaction (idx 11) lacks functional rescue"]},{"year":2018,"claim":"Established ITSN2 as a physiological Cdc42 GEF in immunity and in the kidney, with human disease relevance: it drives B-cell germinal-center responses and its loss-of-function mutations cause nephrotic syndrome through deficient podocyte GEF activity.","evidence":"ITSN2 knockout mice (immune phenotyping, B-T conjugates); human genetics, GEF assay with patient mutants, Itsn2-L KO mouse, podocyte migration assay; ZCL278 in porcine oocytes","pmids":["29337666","29773874","30478952"],"confidence":"High","gaps":["Cell-type-specific GEF substrates beyond Cdc42 not excluded","Genotype-phenotype correlation for individual mutations limited"]},{"year":2019,"claim":"Pinned down the structural basis of GEF activity, showing the PH domain is obligatory for Cdc42 activation by ITSN2 in primary human cells.","evidence":"Single-cell FRET biosensor assays with full-length versus truncated GEF constructs in endothelial cells","pmids":["31469028"],"confidence":"Medium","gaps":["Atomic mechanism of PH-domain contribution unresolved","Regulation of GEF activity in cells not addressed"]},{"year":2020,"claim":"Extended ITSN2's immune function to T cells, linking TCR-induced phosphorylation of ITSN2 to T-cell effector responses.","evidence":"Time-resolved phosphoproteomics and fast-track CRISPR inactivation in primary lymphocytes","pmids":["32618424"],"confidence":"Medium","gaps":["Phosphorylation sites and upstream kinase not defined","Mechanistic link to Cdc42/actin in T cells untested"]},{"year":2020,"claim":"Defined an isoform-selective trafficking role: RhoU binds ITSN2 (not ITSN1) SH3 domains, and ITSN2 is required for fast vesicle recycling on Rab4-positive endosomes.","evidence":"Co-IP, isoform-specific siRNA, transferrin recycling assay, co-localization","pmids":["32737221"],"confidence":"Medium","gaps":["Whether GEF activity is required for recycling untested","Functional consequence of RhoU-ITSN2 binding beyond recycling unclear"]},{"year":2021,"claim":"Identified post-transcriptional control of ITSN2 by m6A, stabilizing its mRNA via METTL3 to support oocyte maturation, and placed ITSN2 in the CBL/CBLB EGFR-signaling network.","evidence":"Oocyte Mettl3 KO with MeRIP-seq and mRNA stability assays; AP-MS with co-IP validation (CBL/CBLB)","pmids":["34689175","34134489"],"confidence":"Medium","gaps":["CBL/CBLB interaction lacks functional follow-up (idx 18, Low)","Reader proteins for oocyte m6A not defined here"]},{"year":2023,"claim":"Revealed a neuronal role: combined ITSN1/2 loss disrupts cortico-striatal neurotransmission and NMDA receptor maintenance, producing ASD/OCD-like behavior.","evidence":"ITSN1/2 double knockout mice with behavior, morphology, electrophysiology, and receptor immunostaining","pmids":["37603735"],"confidence":"High","gaps":["ITSN2-specific contribution versus ITSN1 not separated","Molecular link from ITSN to NMDA receptor maintenance unresolved"]},{"year":2026,"claim":"Extended m6A regulation of ITSN2 to cancer, defining an RBM15B-IGF2BP1-ITSN2 axis that stabilizes ITSN2 mRNA to promote hepatocellular carcinoma growth.","evidence":"MeRIP-seq, RIP-qRT-PCR, and ITSN2-depletion rescue in HCC proliferation/migration and tumor assays","pmids":["41795047"],"confidence":"Medium","gaps":["Downstream effector mechanism of ITSN2 in HCC not defined","Whether Cdc42 GEF activity drives the tumor phenotype untested"]},{"year":null,"claim":"How ITSN2's catalytic GEF function, its scaffold/SH3-mediated trafficking interactions, and its non-GEF roles (senescence induction, NMDA receptor maintenance) are integrated and selectively deployed across tissues remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of full-length ITSN2 or its substrate complex","Whether GEF activity is required for each phenotype not systematically tested","Mechanism switching ITSN2 between trafficking, actin, and transcriptional/senescence outputs unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,3,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,7,8,17]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[8,9,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,13,15]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,17]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[17]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[8,9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,4,7]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,12,16]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[12,16]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[6,9,14]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[19,21]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[13,21]}],"complexes":[],"partners":["CDC42","EPS8","WIP","RHOU","ITSN1","EPS15","CBL","CBLB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NZM3","full_name":"Intersectin-2","aliases":["SH3 domain-containing protein 1B","SH3P18","SH3P18-like WASP-associated protein"],"length_aa":1697,"mass_kda":193.5,"function":"Adapter protein that may provide indirect link between the endocytic membrane traffic and the actin assembly machinery. May regulate the formation of clathrin-coated vesicles (CCPs). Seems to be involved in CCPs maturation including invagination or budding. Involved in endocytosis of integrin beta-1 (ITGB1) and transferrin receptor (TFR). 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a new multimodular human protein involved in clathrin-mediated endocytosis. It has two isoforms generated by alternative splicing: a short isoform with two EH domains, a coiled-coil region, and five SH3 domains, and a long isoform containing additional DH, PH, and C2 domains suggesting GEF activity for Rho-like GTPases. Overexpression of ITSN2 isoforms inhibits transferrin internalization, and ITSN2 co-localizes with Eps15, a component of the endocytic machinery.\",\n      \"method\": \"cDNA characterization, domain analysis, transferrin internalization assay, immunofluorescence co-localization\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional assay (transferrin inhibition) plus co-localization, single lab, multiple methods\",\n      \"pmids\": [\"10922467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"KIAA1256 (ITSN2) was identified as a guanine nucleotide exchange factor (GEF) for Cdc42 using a FRET-based single-molecule probe (Raichu-Cdc42) assay in living cells.\",\n      \"method\": \"FRET-based GTPase activity assay (Raichu-Cdc42 probe) in live cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live-cell FRET-based functional GEF assay, single lab, but direct functional measurement\",\n      \"pmids\": [\"12192056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The K15 protein of Kaposi's sarcoma-associated herpesvirus selectively binds the SH3-C domain of ITSN2 via a conserved PPLP proline-rich motif in its cytoplasmic tail. This interaction was identified by mass spectrometry, domain and peptide arrays, and surface plasmon resonance, and confirmed by co-localization of K15 and ITSN2 to discrete compartments within B cells.\",\n      \"method\": \"Mass spectrometry, domain/peptide arrays, surface plasmon resonance, co-immunoprecipitation, immunofluorescence co-localization\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal in vitro and cellular methods (SPR, arrays, MS, co-IP, co-localization) in one study confirming the interaction\",\n      \"pmids\": [\"17696407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The DH-PH tandem of ITSN2-L acts as a nucleotide exchange factor for Cdc42 during Xenopus early embryonic development. Overexpression of this domain in embryos caused hyperpigmentation and gastrulation failure affecting the actin cytoskeleton, phenotypes dependent on Cdc42 (partially rescued by dominant-negative Cdc42 and phenocopied by constitutively active Cdc42).\",\n      \"method\": \"Overexpression of functional domains in Xenopus embryos, genetic epistasis with dominant-negative and constitutively active Cdc42, phenotypic analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis with GTPase mutants and domain dissection in a vertebrate model, single lab\",\n      \"pmids\": [\"21530493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ITSN2 binds Eps8 protein via its coiled-coil domain interacting with amino acids 260–306 of Eps8, and overexpression of ITSN2 promotes lysosomal degradation of Eps8. The interaction was demonstrated by yeast two-hybrid, co-immunoprecipitation, co-localization, and GST pull-down assays.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, GST pull-down, immunofluorescence, protein stability assay with lysosome inhibitor\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal binding assays plus functional degradation assay, single lab\",\n      \"pmids\": [\"22449706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ITSN2 is required for GM-CSF receptor (GMR)-mediated activation of JAK2 at clathrin-coated structures (CCSs). Knockdown of ITSN2 attenuated GMR-mediated JAK2 activation, and an ITSN2-non-binding mutant of GMR that failed to target to CCSs also failed to activate JAK2. Ligand treatment enhanced JAK2/GMR association at CCSs and induced a conformational change in JAK2 required for CCS-localized CK2-mediated activation.\",\n      \"method\": \"RNAi knockdown, dominant-negative dynamin, receptor binding mutants, co-immunoprecipitation, subcellular fractionation/co-localization\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function knockdown plus receptor mutant approach with defined signaling readout, single lab\",\n      \"pmids\": [\"22935703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ITSN2 expression is induced >25-fold by the ING1a tumor suppressor during cellular senescence. ITSN2 overexpression independently induces p16 and p57KIP2 cyclin-dependent kinase inhibitors that block Rb inactivation. Knockdown of ITSN2 blocks ING1a-induced senescence, establishing ITSN2 as a major downstream effector of ING1a-induced senescence via the Rb-E2F pathway. ITSN2 is also induced in normally senescing cells.\",\n      \"method\": \"Gene expression profiling, ITSN2 overexpression, siRNA knockdown, senescence assays (β-galactosidase, morphology, SAHF), Western blotting for p16/p57/Rb\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain- and loss-of-function experiments with specific pathway markers, independently verified in normally senescing cells\",\n      \"pmids\": [\"23472054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ITSN2 SH3 domains bind the same proline-rich ligands as ITSN1, but ITSN2 (unlike ITSN1 short isoform) is specifically tyrosine-phosphorylated in various cell lines, and EGF stimulation enhances this phosphorylation, enabling recognition of ITSN2 by SH2 domains of Fyn, Fgr, Abl1, PI3K regulatory subunit, Grb2, Crk, and PLCγ. Endogenous ITSN1 and ITSN2 co-localize and form a complex in cells.\",\n      \"method\": \"Co-immunoprecipitation, SH3 domain binding assays, phosphorylation analysis, SH2 domain array/binding assays, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding and phosphorylation assays in cells, single lab, several orthogonal methods\",\n      \"pmids\": [\"23936226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ITSN2 (and ITSN1) interact with the actin-regulating protein WIP via the SH3 domains of ITSNs and the proline-rich region of WIP. Endogenous ITSN1 and ITSN2 localize to invadopodia of MDA-MB-231 breast cancer cells, and ITSN1, WIP, and N-WASP can form a trimeric complex in cells.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down (SH3 domain mapping), immunofluorescence in invasive cancer cell lines\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and pull-down with domain mapping plus cellular localization, single lab\",\n      \"pmids\": [\"25797047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ITSN2 depletion in mouse oocytes causes delayed meiotic resumption, defective cytokinesis, abnormal spindle, misaligned chromosomes, and loss of cortical actin cap. ITSN2 depletion reduces Cdc42 activity, and forced expression of dominant-positive Cdc42 partially rescues actin cap formation. The downstream effectors WASP and Arp2 are mislocalized upon ITSN2 knockdown, supporting a model in which ITSN2 acts upstream of Cdc42 to regulate WASP/Arp2/3 and actin dynamics in oocyte meiosis.\",\n      \"method\": \"Morpholino-mediated knockdown, dominant-positive Cdc42 rescue, small molecule ZCL278 (ITSN-Cdc42 interaction inhibitor), immunofluorescence, Cdc42 activity assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with GTPase epistasis rescue, pharmacological inhibition, multiple cellular readouts in single rigorous study\",\n      \"pmids\": [\"28626024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ITSN2 is a target of aldosterone-regulated miR-27a/b in the distal kidney nephron. miR-27a/b binds the 3'-UTR of ITSN2 mRNA; aldosterone stimulation decreases ITSN2 mRNA and protein. Depletion of ITSN2 increases ENaC-mediated Na+ transport, while ITSN2 overexpression reduces ENaC function, demonstrating that ITSN2 negatively regulates epithelial sodium channel activity.\",\n      \"method\": \"3'-UTR reporter assay, siRNA knockdown, overexpression, ENaC electrophysiology (Na+ transport assay), Western blot\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional ENaC assay with both gain- and loss-of-function, plus miRNA target validation, single lab\",\n      \"pmids\": [\"27636893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mammalian verprolin CR16 forms complexes with ITSN1 and ITSN2 in human cell lines. CR16 modulates ITSN association with β-actin, and overexpressed CR16 promotes co-localization of ITSN1 with F-actin in MCF-7 cells.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, Western blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP/co-localization, single lab, no functional rescue\",\n      \"pmids\": [\"28161632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ITSN2-deficient mice show increased mortality during primary influenza infection, incomplete protection after flu vaccination, reduced germinal centre formation, and impaired antibody responses. These defects are intrinsic to the B cell compartment. In vivo, ITSN2-deficient B cells show reduced SLAM, CD84, and ICOSL expression, diminished ability to form long-term T cell conjugates, reduced proliferation, and impaired germinal centre differentiation, demonstrating ITSN2 as a key regulator of adaptive B cell immunity via Cdc42/WASp/WIP-dependent actin remodeling downstream of BCR engagement.\",\n      \"method\": \"ITSN2 knockout mice, viral infection, vaccination, flow cytometry, in vivo B-T cell conjugate assays, germinal centre analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO mouse with multiple specific immunological readouts, cell-intrinsic rescue experiments, rigorous controls\",\n      \"pmids\": [\"29337666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss-of-function mutations in ITSN2 (along with ITSN1, MAGI2, TNS2, DLC1, CDK20) cause partially treatment-sensitive nephrotic syndrome (NS) in humans. ITSN1 and ITSN2 function as podocytic guanine nucleotide exchange factors for Cdc42, and patient-derived ITSN2 mutants show deficient GEF activity. Itsn2-L knockout mice recapitulate the mild NS phenotype. Knockdown of ITSN2 in podocytes reduces migration rate.\",\n      \"method\": \"Human genetic analysis, GEF activity assay with patient mutants, Itsn2-L knockout mouse model with NS phenotype, podocyte knockdown migration assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro GEF activity with patient mutants, KO mouse recapitulating human disease, cell migration assay, multiple orthogonal methods\",\n      \"pmids\": [\"29773874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Inhibition of the ITSN2-Cdc42 interaction using the small molecule ZCL278 prevents porcine oocytes from completing meiosis, causes spindle defects, chromosomal congression failure, and impairs actin polymerization, supporting ITSN2 function upstream of Cdc42 in meiotic apparatus assembly.\",\n      \"method\": \"Small molecule inhibitor (ZCL278) targeting ITSN-Cdc42 interaction, spindle and chromosome immunofluorescence, actin staining\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological disruption of specific protein-protein interaction with multiple cellular readouts, single lab\",\n      \"pmids\": [\"30478952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The DHPH domain of ITSN2 (together with ITSN1 and PLEKHG1) activates Cdc42 in primary human endothelial cells, whereas the isolated DH domain alone does not activate Cdc42, establishing that the PH domain is required for ITSN2 GEF activity toward Cdc42.\",\n      \"method\": \"Single-cell FRET measurements with Rho GTPase biosensors, overexpression of full-length and truncated GEF constructs in primary human endothelial cells\",\n      \"journal\": \"Small GTPases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative FRET-based GEF activity assay in primary human cells with domain dissection, single lab\",\n      \"pmids\": [\"31469028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ITSN2 is phosphorylated following TCR stimulation in primary T cells, and gene inactivation of ITSN2 in primary lymphocytes using a fast-track approach impairs T-cell effector functions, demonstrating that ITSN2 regulates T-cell responses downstream of TCR engagement.\",\n      \"method\": \"Time-resolved phosphoproteomics, fast-track CRISPR gene inactivation in primary lymphocytes, T-cell effector function assays\",\n      \"journal\": \"Molecular systems biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomic identification plus primary cell loss-of-function with functional readout, single lab\",\n      \"pmids\": [\"32618424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RhoU binds ITSN2 (but not ITSN1) via its N-terminal PxxP motif interacting with the SH3 domains of ITSN2. Silencing of ITSN2 (but not ITSN1) increases transferrin accumulation in early endosomes, indicating a defect in fast vesicle recycling. RhoU and ITSN2 co-localize on Rab4-positive fast recycling endosomes.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, fluorescent transferrin uptake assay, immunofluorescence co-localization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction mapping plus specific silencing with defined endosomal trafficking readout, single lab\",\n      \"pmids\": [\"32737221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"EPS15L1 and ITSN2 were validated as stable binding partners of both CBL and CBLB (ubiquitin E3 ligases) through biochemical assays (AP-MS and co-IP validation), placing ITSN2 in the EGFR signaling network.\",\n      \"method\": \"Affinity purification–mass spectrometry (AP-MS), biochemical co-IP validation\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single AP-MS with co-IP validation, no functional follow-up for ITSN2 specifically\",\n      \"pmids\": [\"34134489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3-mediated m6A modification targets Itsn2 mRNA in mouse oocytes to enhance its stability, and this stabilization influences oocyte meiosis. Loss of METTL3 in oocytes (Gdf9-Cre) reduces Itsn2 expression and is associated with defective oocyte maturation.\",\n      \"method\": \"Oocyte-specific Mettl3 knockout, MeRIP-seq (m6A immunoprecipitation sequencing), RNA-seq, mRNA stability assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A mapping combined with KO phenotype and mRNA stability data, single lab\",\n      \"pmids\": [\"34689175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Deletion of both ITSN1 and ITSN2 in mice leads to ASD/OCD-like behavioral alterations and defective cortico-striatal neurotransmission. The striatum is decreased in size, striatal neurons show reduced dendritic complexity and spine density, and NMDA receptor currents are reduced due to postsynaptic NMDA receptor depletion, establishing ITSN1/2 as regulators of cortico-striatal plasticity and NMDA receptor maintenance.\",\n      \"method\": \"ITSN1/2 double knockout mice, behavioral testing (ASD/OCD-like behaviors), morphological analysis, electrophysiology (NMDA receptor currents), immunostaining\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double KO with multiple orthogonal readouts (behavior, morphology, electrophysiology, receptor quantification), single lab, rigorous study\",\n      \"pmids\": [\"37603735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"RBM15B promotes m6A modification of ITSN2 mRNA and, through the m6A reader IGF2BP1, stabilizes ITSN2 mRNA in hepatocellular carcinoma (HCC), enhancing ITSN2 expression. ITSN2 depletion rescues the tumor-promoting phenotype induced by RBM15B overexpression, establishing a RBM15B-IGF2BP1-ITSN2 regulatory axis in HCC.\",\n      \"method\": \"MeRIP-seq, RNA immunoprecipitation (RIP)-qRT-PCR, rescue assays (cell proliferation and migration), in vitro and in vivo tumor assays\",\n      \"journal\": \"Journal of cancer research and clinical oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-qRT-PCR validation of m6A-IGF2BP1-ITSN2 axis plus rescue functional assays, single lab\",\n      \"pmids\": [\"41795047\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ITSN2 is a multi-domain scaffold/adaptor protein that functions as a guanine nucleotide exchange factor (GEF) for Cdc42 via its DH-PH domains (requiring the PH domain for activity), participates in clathrin-mediated endocytosis and fast endosomal recycling (through SH3-domain-mediated interactions with dynamin, WIP, RhoU, and Eps8), regulates actin cytoskeletal dynamics and meiotic division in oocytes through the Cdc42-WASP-Arp2/3 pathway, mediates B cell adaptive immunity and T cell effector functions, is required in podocytes as a Cdc42 GEF for normal kidney glomerular function, acts downstream of ING1a to induce cellular senescence via the Rb-E2F pathway, and is subject to m6A-mediated mRNA stabilization (by METTL3/RBM15B-IGF2BP1) and miRNA-27-mediated repression that regulates ENaC-dependent Na+ transport.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ITSN2 is a multimodular scaffold/adaptor that couples membrane trafficking to actin cytoskeletal remodeling by functioning as a guanine nucleotide exchange factor (GEF) for the Rho-family GTPase Cdc42 [#1, #3]. Generated as short and long splice isoforms, the protein combines EH domains, a coiled-coil, and SH3 domains with an additional DH-PH-C2 module in the long isoform; GEF activity toward Cdc42 resides in the DH-PH tandem and strictly requires the PH domain, as the isolated DH domain is inactive [#0, #15]. Through its SH3 domains ITSN2 engages proline-rich ligands including WIP and RhoU, and via its coiled-coil it binds Eps8 and promotes its lysosomal degradation, linking the protein to clathrin-mediated endocytosis, Cdc42-WASP/Arp2/3-driven actin assembly, and RhoU-dependent fast endosomal recycling on Rab4-positive endosomes [#4, #8, #17]; ITSN2 overexpression inhibits transferrin internalization and it co-localizes with the endocytic component Eps15 [#0]. This Cdc42-actin axis underlies its physiological roles: ITSN2 is required upstream of Cdc42-WASP-Arp2/3 for cortical actin cap formation, spindle assembly, and meiotic progression in oocytes [#9, #14], and supports adaptive immunity, driving germinal-center B-cell responses through Cdc42/WASp/WIP-dependent actin remodeling downstream of the B-cell receptor and regulating T-cell effector functions downstream of TCR engagement [#12, #16]. ITSN2 also acts as a podocyte Cdc42 GEF essential for glomerular function, and loss-of-function mutations that impair its GEF activity cause partially treatment-sensitive nephrotic syndrome in humans, recapitulated by Itsn2-L knockout mice [#13]. Beyond trafficking and actin, ITSN2 is a major downstream effector of ING1a-induced cellular senescence, inducing the cyclin-dependent kinase inhibitors p16 and p57KIP2 to block Rb inactivation [#6], negatively regulates ENaC-mediated Na+ transport under aldosterone/miR-27 control [#10], and together with ITSN1 maintains cortico-striatal NMDA receptor function and plasticity [#20]. Its expression is tuned post-transcriptionally by m6A-mediated mRNA stabilization via METTL3 and an RBM15B-IGF2BP1 axis [#19, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established ITSN2 as a multidomain endocytic protein and predicted, from its long-isoform DH-PH-C2 architecture, that it acts as a GEF for Rho-family GTPases.\",\n      \"evidence\": \"cDNA/domain characterization, transferrin internalization assay, and co-localization with Eps15\",\n      \"pmids\": [\"10922467\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GEF activity inferred from domain content, not yet measured\", \"Which Rho GTPase substrate not identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified Cdc42 as the GTPase substrate of ITSN2, converting the domain-based prediction into a measured catalytic activity.\",\n      \"evidence\": \"FRET-based Raichu-Cdc42 GEF activity assay in living cells\",\n      \"pmids\": [\"12192056\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Domain requirements for activity not dissected\", \"Physiological context of Cdc42 activation untested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed ITSN2 GEF activity in a developmental and cytoskeletal context, showing the DH-PH tandem activates Cdc42 to control actin and morphogenesis in vivo.\",\n      \"evidence\": \"Domain overexpression in Xenopus embryos with dominant-negative/constitutively active Cdc42 epistasis\",\n      \"pmids\": [\"21530493\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Endogenous requirement not tested (gain-of-function only)\", \"Direct molecular partners in embryo unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined ITSN2 protein-protein interactions and signaling roles, linking it to Eps8 turnover and to receptor-proximal JAK2 activation at clathrin-coated structures.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, GST pull-down, lysosomal stability assay (Eps8); RNAi and receptor mutants (GMR/JAK2)\",\n      \"pmids\": [\"22449706\", \"22935703\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting GEF activity to Eps8 degradation unclear\", \"Generality of JAK2 role across receptors untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed two distinct ITSN2 functions: a senescence-effector role downstream of ING1a via the Rb-E2F pathway, and isoform-specific tyrosine phosphorylation creating SH2-domain docking sites that distinguish ITSN2 from ITSN1.\",\n      \"evidence\": \"Reciprocal overexpression/knockdown with senescence markers (p16/p57/Rb); phosphorylation analysis and SH2 domain binding arrays\",\n      \"pmids\": [\"23472054\", \"23936226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ITSN2 induces p16/p57 mechanistically not resolved\", \"Functional consequence of each SH2-mediated interaction untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected ITSN2 SH3 domains to actin machinery by demonstrating WIP binding and localization to invadopodia, embedding it in the Cdc42-WASP/Arp2/3 network.\",\n      \"evidence\": \"Co-IP, GST pull-down domain mapping, immunofluorescence in invasive cancer cells\",\n      \"pmids\": [\"25797047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional requirement of ITSN2 at invadopodia not directly tested\", \"Trimeric complex shown for ITSN1, not explicitly ITSN2\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated an endogenous, physiological requirement for ITSN2 as a Cdc42 GEF in oocyte meiosis, regulating actin cap formation, spindle, and chromosome alignment via WASP/Arp2/3, and identified miR-27/ENaC regulation in kidney.\",\n      \"evidence\": \"Morpholino knockdown with dominant-positive Cdc42 rescue and ZCL278 inhibitor (oocytes); 3'-UTR reporter, knockdown/overexpression with ENaC electrophysiology (kidney)\",\n      \"pmids\": [\"28626024\", \"27636893\", \"28161632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct GEF measurement in oocytes not performed\", \"CR16 interaction (idx 11) lacks functional rescue\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established ITSN2 as a physiological Cdc42 GEF in immunity and in the kidney, with human disease relevance: it drives B-cell germinal-center responses and its loss-of-function mutations cause nephrotic syndrome through deficient podocyte GEF activity.\",\n      \"evidence\": \"ITSN2 knockout mice (immune phenotyping, B-T conjugates); human genetics, GEF assay with patient mutants, Itsn2-L KO mouse, podocyte migration assay; ZCL278 in porcine oocytes\",\n      \"pmids\": [\"29337666\", \"29773874\", \"30478952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type-specific GEF substrates beyond Cdc42 not excluded\", \"Genotype-phenotype correlation for individual mutations limited\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Pinned down the structural basis of GEF activity, showing the PH domain is obligatory for Cdc42 activation by ITSN2 in primary human cells.\",\n      \"evidence\": \"Single-cell FRET biosensor assays with full-length versus truncated GEF constructs in endothelial cells\",\n      \"pmids\": [\"31469028\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Atomic mechanism of PH-domain contribution unresolved\", \"Regulation of GEF activity in cells not addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended ITSN2's immune function to T cells, linking TCR-induced phosphorylation of ITSN2 to T-cell effector responses.\",\n      \"evidence\": \"Time-resolved phosphoproteomics and fast-track CRISPR inactivation in primary lymphocytes\",\n      \"pmids\": [\"32618424\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphorylation sites and upstream kinase not defined\", \"Mechanistic link to Cdc42/actin in T cells untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined an isoform-selective trafficking role: RhoU binds ITSN2 (not ITSN1) SH3 domains, and ITSN2 is required for fast vesicle recycling on Rab4-positive endosomes.\",\n      \"evidence\": \"Co-IP, isoform-specific siRNA, transferrin recycling assay, co-localization\",\n      \"pmids\": [\"32737221\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GEF activity is required for recycling untested\", \"Functional consequence of RhoU-ITSN2 binding beyond recycling unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified post-transcriptional control of ITSN2 by m6A, stabilizing its mRNA via METTL3 to support oocyte maturation, and placed ITSN2 in the CBL/CBLB EGFR-signaling network.\",\n      \"evidence\": \"Oocyte Mettl3 KO with MeRIP-seq and mRNA stability assays; AP-MS with co-IP validation (CBL/CBLB)\",\n      \"pmids\": [\"34689175\", \"34134489\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CBL/CBLB interaction lacks functional follow-up (idx 18, Low)\", \"Reader proteins for oocyte m6A not defined here\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a neuronal role: combined ITSN1/2 loss disrupts cortico-striatal neurotransmission and NMDA receptor maintenance, producing ASD/OCD-like behavior.\",\n      \"evidence\": \"ITSN1/2 double knockout mice with behavior, morphology, electrophysiology, and receptor immunostaining\",\n      \"pmids\": [\"37603735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ITSN2-specific contribution versus ITSN1 not separated\", \"Molecular link from ITSN to NMDA receptor maintenance unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended m6A regulation of ITSN2 to cancer, defining an RBM15B-IGF2BP1-ITSN2 axis that stabilizes ITSN2 mRNA to promote hepatocellular carcinoma growth.\",\n      \"evidence\": \"MeRIP-seq, RIP-qRT-PCR, and ITSN2-depletion rescue in HCC proliferation/migration and tumor assays\",\n      \"pmids\": [\"41795047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream effector mechanism of ITSN2 in HCC not defined\", \"Whether Cdc42 GEF activity drives the tumor phenotype untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ITSN2's catalytic GEF function, its scaffold/SH3-mediated trafficking interactions, and its non-GEF roles (senescence induction, NMDA receptor maintenance) are integrated and selectively deployed across tissues remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of full-length ITSN2 or its substrate complex\", \"Whether GEF activity is required for each phenotype not systematically tested\", \"Mechanism switching ITSN2 between trafficking, actin, and transcriptional/senescence outputs unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005085\", \"supporting_discovery_ids\": [1, 3, 13, 15]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 3, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 7, 8, 17]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [8, 9, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 13, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 17]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 4, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 12, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [12, 16]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6, 9, 14]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [19, 21]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [13, 21]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CDC42\", \"EPS8\", \"WIP\", \"RHOU\", \"ITSN1\", \"EPS15\", \"CBL\", \"CBLB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}