{"gene":"HIP1","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1997,"finding":"HIP1 (human homologue of S. cerevisiae Sla2p) directly interacts with huntingtin in the brain; this interaction is inversely correlated with polyglutamine length in huntingtin, and HIP1 co-localizes with membrane-associated huntingtin, providing a molecular link between huntingtin and the neuronal cytoskeleton.","method":"Yeast two-hybrid, co-localization, biochemical interaction assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding assays, co-localization, replicated by multiple groups (Kalchman et al. 1997; Wanker et al. 2001)","pmids":["9140394"],"is_preprint":false},{"year":2001,"finding":"HIP1 co-purifies with clathrin-coated vesicles from brain, directly binds the terminal domain of clathrin heavy chain and the AP-2 adaptor complex (predominantly through amino acids 276–335 containing consensus clathrin- and AP2-binding sites), and its coiled-coil domain cooperates with these sites to target HIP1 to CCVs. Expression of HIP1 fragments potently blocks clathrin-mediated endocytosis.","method":"CCV purification, co-immunoprecipitation, direct binding assays, deletion mapping, dominant-negative overexpression with endocytosis block readout","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro binding with deletion mutants, CCV purification, functional dominant-negative assay, replicated by multiple independent labs (Metzler et al., Waelter et al., Mishra et al., all 2001)","pmids":["11517213","11532990","11577110"],"is_preprint":false},{"year":2001,"finding":"HIP1 binds both AP-2 and clathrin via discrete modular interaction sequences analogous to those in epsin and AP180; anchored to a phosphoinositide-containing membrane via its ENTH domain, HIP1 associates with AP-2 and together they efficiently recruit clathrin to the bilayer, implicating HIP1 in lipid-regulated clathrin lattice biogenesis.","method":"In vitro binding assays, liposome recruitment assays, clathrin assembly assays, CCV co-purification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted lipid-binding and clathrin assembly in vitro with modular deletion analysis, multiple orthogonal methods","pmids":["11577110"],"is_preprint":false},{"year":2002,"finding":"Free Hip-1 (released from huntingtin upon polyglutamine expansion) binds the novel protein Hippi via their pseudo-death-effector domains to form a heterodimer; this Hip-1/Hippi heterodimer recruits procaspase-8 into a ternary complex, initiating apoptosis through the extrinsic caspase-8 pathway independent of death receptors.","method":"Co-immunoprecipitation, yeast two-hybrid, caspase-8 recruitment assay, apoptosis assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, complex reconstitution, functional caspase recruitment and apoptosis assay, replicated in multiple cell types","pmids":["11788820"],"is_preprint":false},{"year":2002,"finding":"HIP1 and its paralogue HIP12 are major components of the clathrin coat; HIP1 contains a clathrin-box and AP2 consensus-binding sites mediating high-affinity binding to clathrin heavy chain terminal domain and AP2 alpha-ear, respectively. Both HIP1 and HIP12 stimulate clathrin assembly through their central helical domain, which binds directly to clathrin light chain. HIP12 (unlike HIP1) co-sediments with F-actin while HIP1 does not bind actin in vitro.","method":"In vitro binding assays, clathrin assembly assays, F-actin co-sedimentation, deletion/mutation mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding with mutagenesis, clathrin assembly assay, F-actin sedimentation, single lab with multiple orthogonal methods","pmids":["11889126"],"is_preprint":false},{"year":2003,"finding":"HIP1 knockout mice (HIP1−/−) develop neurological deficits (tremor, gait ataxia, kyphosis), decreased assembly of endocytic protein complexes on liposomal membranes, and a dose-dependent defect in clathrin-mediated internalization of GluR1-containing AMPA receptors in hippocampal neurons, demonstrating that HIP1 is required for AMPA receptor trafficking via clathrin-mediated endocytosis.","method":"Targeted gene knockout in mice, internalization assays in primary neurons, liposome-based endocytic complex assembly assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean in vivo KO with specific cellular phenotype (AMPA receptor trafficking defect), orthogonal in vitro assembly assay, replicated across neuronal preparations","pmids":["12839988"],"is_preprint":false},{"year":2004,"finding":"HIP1 (and HIP1R) directly interact with the conserved 22-amino-acid regulatory sequence of clathrin light chains (CLC); the regulatory N-terminal residues of this CLC sequence mediate the interaction and are required for HIP1/HIP1R stimulation of clathrin assembly in vitro. In vivo overexpression of the Hip1R-binding fragment of CLC disrupts actin distribution.","method":"In vitro binding assays with CLC mutants, clathrin assembly assay, in vivo actin distribution analysis upon overexpression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of CLC binding interface + in vitro clathrin assembly readout + in vivo actin phenotype, replicated in companion paper (Legendre-Guillemin et al. 2004)","pmids":["15533940","15533941"],"is_preprint":false},{"year":2004,"finding":"Residues Leu-451, Leu-452, and Arg-453 within HIP1's central helical domain (aa 450–456) are required for clathrin light chain (CLC) binding; CLC-binding mutants fail to promote clathrin assembly in vitro, are unable to target to clathrin-coated pits and vesicles in cells, but still support HIP1 homodimerization and heterodimerization with HIP1R.","method":"Site-directed mutagenesis, in vitro clathrin assembly assay, subcellular localization by fluorescence microscopy, dimerization assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis coupled with in vitro functional assay and in vivo localization, single lab but multiple orthogonal methods","pmids":["15533941"],"is_preprint":false},{"year":2004,"finding":"HIP1 binds 3-phosphate-containing inositol lipids (PI(3,4)P2 and PI(3,5)P2) preferentially via its ENTH domain; this ENTH domain is necessary for lipid binding, and ENTH-deleted HIP1 induces apoptosis. Full-length HIP1 stabilizes pools of growth factor receptors (receptor tyrosine kinases) by prolonging their half-life following ligand-induced endocytosis.","method":"Lipid-binding assays with ENTH domain mutants, receptor half-life measurements after ligand stimulation, apoptosis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct lipid binding shown with domain deletion; receptor stabilization measured biochemically; single lab, two methods","pmids":["14732715"],"is_preprint":false},{"year":2004,"finding":"The I/LWEQ module (C-terminal actin-binding domain) of HIP1 binds F-actin, but actin binding is regulated by intrasteric inhibition: a conserved structural element within the I/LWEQ module occludes the primary actin-binding determinants of HIP1 and other family members (Talin1, Talin2, Hip12). The I/LWEQ module also contains a dimerization motif and stabilizes actin filaments against depolymerization.","method":"F-actin co-sedimentation assays, affinity measurements, truncation/mutagenesis analysis","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro actin binding assays with multiple constructs demonstrating intrasteric inhibition mechanism, single lab","pmids":["15581353"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of the HIP1 coiled-coil domain (residues 482–586) at 2.8 Å reveals a partially splayed-open dimeric coiled-coil; structural analysis identified a hydrophobic surface path (S3) proposed as the clathrin light chain interaction surface.","method":"X-ray crystallography","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure solved at 2.8 Å with structural interpretation, but functional validation of the S3 surface was not experimentally confirmed within this paper","pmids":["17257618"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of HIP1 subfragment 371–481 at 2.8 Å reveals a partially opened coiled-coil with a basic surface near residues F432 and K474 proposed as the HIPPI-binding site, and a highly negatively charged adjacent region. This structure rules out a death-effector domain fold for the HIPPI-interaction module.","method":"X-ray crystallography, structural comparison","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure solved at 2.8 Å; functional assignment of the basic surface to HIPPI binding is structural inference without direct mutagenesis confirmation in this paper","pmids":["18155047"],"is_preprint":false},{"year":2007,"finding":"HIP1 colocalizes with NMDARs in hippocampal and cortical neurons and affinity-purifies with NMDARs by GST pull-down and co-immunoprecipitation. In HIP1−/− neurons, NMDA-induced AMPA receptor internalization is reduced by 75%, long-term depression is impaired, and neurons are partially protected from NMDA-induced excitotoxicity. HIP1 also modulates NMDA-induced phosphorylation of Akt and huntingtin.","method":"GST pull-down, co-immunoprecipitation, quantitative AMPA receptor internalization assay in KO neurons, LTD electrophysiology in brain slices, LDH/TUNEL/caspase-3 excitotoxicity assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal pull-down and Co-IP, clean KO with multiple orthogonal cellular phenotypes (internalization, LTD, excitotoxicity), all in same study","pmids":["17329427"],"is_preprint":false},{"year":2008,"finding":"Clathrin light chain (CLC) binding to Hip1 (and Hip1R) induces a compact conformation of their coiled-coil domains and significantly reduces actin binding by their THATCH (I/LWEQ) domains; thus clathrin light chain acts as a negative regulator of Hip1-actin interactions. Hip1 coiled-coil homodimers do not heterodimerize with Hip1R in vitro.","method":"Biophysical analysis (calorimetry, analytical ultracentrifugation, CD), actin co-sedimentation assay, conformational analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biophysical methods demonstrating CLC-induced conformational change and its functional consequence on actin binding, single lab","pmids":["18790740"],"is_preprint":false},{"year":2009,"finding":"Live-cell imaging shows HIP1 is recruited early to clathrin-coated pits at the plasma membrane and is absent from newly internalized vesicles (after vesicle closure); shRNA knockdown of clathrin compromises HIP1 membrane localization. An HIP1 fragment lacking ANTH and Talin-like domains inhibits transferrin internalization while retaining membrane clathrin co-localization, placing HIP1 function in pit maturation and coated vesicle formation.","method":"Live-cell fluorescence imaging, pHluorin-tagged transferrin receptor assay, shRNA knockdown, dominant-negative fragment expression","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct live-imaging localization tied to functional consequence, plus shRNA and dominant-negative dissection; single lab","pmids":["19626275"],"is_preprint":false},{"year":2009,"finding":"The HIP1/Hippi heterodimer (via HIP-1 as nuclear transporter) accumulates in the nucleus and the pseudo-death-effector domain of HIPPI binds to specific promoter motifs of caspase-1, -8, and -10 genes, increasing their transcription. Residue R393 of HIPPI is critical for promoter binding; HIP-1 nuclear localization signal is required for HIPPI nuclear translocation and consequent caspase-1 upregulation.","method":"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), mutagenesis (R393E), HIP-1 NLS deletion, HIP-1 knockdown","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter + ChIP + mutagenesis in single lab; NLS deletion mechanistically places HIP1 as nuclear transporter of HIPPI","pmids":["19934260"],"is_preprint":false},{"year":2011,"finding":"HIPPI (HIP-1 protein interactor) directly binds the promoter of REST/NRSF and activates its transcription; this activation requires HIP1 as the nuclear transporter of HIPPI. In a HD cell model, reduced interaction of mutant huntingtin with HIP1 leads to increased nuclear accumulation of HIPPI/HIP1, greater REST promoter occupancy, REST upregulation, and consequent repression of BDNF and proenkephalin.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, HIP1 overexpression/knockdown, NLS mutation, huntingtin polyQ model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirming promoter occupancy, reporter assay, mechanistic dissection with NLS mutant; single lab","pmids":["21832040"],"is_preprint":false},{"year":2014,"finding":"HIP1 is identified as a fusion partner of ALK (anaplastic lymphoma kinase) in NSCLC; the HIP1-ALK fusion protein (exon 28 of HIP1 fused to exon 20 of ALK) is constitutively active and drives tumor growth in a patient-derived xenograft model that is sensitive to the ALK inhibitor crizotinib in vivo.","method":"RNA-seq, RT-PCR, genomic sequencing, in vivo PDX efficacy study with crizotinib","journal":"Journal of thoracic oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fusion gene characterized by sequencing and confirmed oncogenic activity by in vivo PDX pharmacology; replicated in multiple independent case reports","pmids":["24496003","24518094"],"is_preprint":false},{"year":2014,"finding":"HIP1 mediates HGF-induced c-Met signaling by promoting β1-integrin turnover (increased endocytosis), which is required for c-Met-driven mesenchymal-type cell invasion. siRNA screen identified HIP1 as a crucial c-Met effector for this morphological/invasive outcome.","method":"High-throughput siRNA screen, integrin trafficking assay, invasion assay, c-Met activation assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional siRNA screen with specific invasion readout, integrin turnover measured; single lab","pmids":["24790222"],"is_preprint":false},{"year":2018,"finding":"HIP1 is required for PDGFR-mediated RAC1 activation and lamellipodia formation in fibroblast-like synoviocytes; knockdown of HIP1 reduces receptor tyrosine kinase responses, RAC1 activation, and invasiveness. HIP1 knockout mice are protected in KRN serum-induced arthritis, demonstrating an in vivo role for HIP1 in joint disease severity via RTK/Rac1 signaling.","method":"siRNA knockdown, RAC1 activation assay, invasion assay, HIP1 KO mouse model with arthritis induction","journal":"Annals of the rheumatic diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse in vivo plus mechanistic cell-based assays; single lab with two orthogonal approaches","pmids":["30049830"],"is_preprint":false},{"year":2018,"finding":"In HIP1-deficient mice, phosphocholine levels are low and Gdpd3 (lysophospholipase D) expression is reduced. Brain-specific rescue of HIP1 expression does not rescue the phenotype, whereas expression in kidney, spleen, and liver does, indicating the degenerative phenotype is not brain-autonomous. Double knockout of Gdpd3 and Hip1 worsens the Hip1 phenotype, suggesting Gdpd3 compensates for Hip1 loss in choline metabolism.","method":"Conditional knockout (Cre/lox), tissue-specific rescue with Cre drivers, metabolomics (phosphocholine), microarray, double KO genetic interaction","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via double KO + conditional tissue rescue; metabolomics readout; single lab","pmids":["30224518"],"is_preprint":false},{"year":2022,"finding":"UGT2B28 physically associates with HIP1, stabilizing it and priming AR and EGFR signaling pathways leading to ERK1/2 activation, cell proliferation, and EMT in prostate cancer; HIP1 knockdown in UGT2B28-positive cells abolishes these proliferative advantages.","method":"Co-immunoprecipitation (protein-protein interaction), siRNA knockdown, signaling pathway assays (ERK1/2, AR, EGFR), cell proliferation assay","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP establishing partnership, functional knockdown assay; single lab, limited mechanistic depth on HIP1 specifically","pmids":["36343786"],"is_preprint":false}],"current_model":"HIP1 is a multi-domain endocytic adaptor protein that co-localizes with clathrin-coated vesicles and directly binds clathrin heavy chain (via a clathrin-box), clathrin light chain (via its coiled-coil domain, regulated by CLC-induced conformational change that suppresses actin binding), and the AP-2 adaptor complex (via DPF-like motifs), thereby promoting clathrin lattice assembly and membrane internalization of cargo including AMPA and NMDA receptors; when released from huntingtin (as occurs with polyglutamine expansion), free HIP1 heterodimerizes with Hippi to recruit procaspase-8 and initiate extrinsic apoptosis, and the HIP1/Hippi complex also translocates to the nucleus to transcriptionally activate caspase genes and REST, linking endocytic function to apoptotic and transcriptional regulation in the context of Huntington's disease."},"narrative":{"mechanistic_narrative":"HIP1 is a multi-domain endocytic adaptor that links clathrin-coated vesicle assembly to actin dynamics, receptor trafficking, and—in the context of huntingtin biology—apoptotic and transcriptional regulation [PMID:11517213, PMID:11532990, PMID:11577110, PMID:12839988]. It co-purifies with brain clathrin-coated vesicles and directly binds the clathrin heavy chain terminal domain and the AP-2 adaptor complex through discrete modular clathrin-box and AP2-binding motifs, while membrane anchoring through its ENTH domain, which binds 3-phosphate phosphoinositides, allows HIP1 and AP-2 to recruit clathrin to the bilayer and nucleate lattice biogenesis [PMID:11517213, PMID:11532990, PMID:11577110, PMID:14732715]. Its central helical/coiled-coil domain binds clathrin light chain through residues Leu-451/Leu-452/Arg-453 and stimulates clathrin assembly; light-chain binding drives a compact coiled-coil conformation that suppresses the intrasterically regulated F-actin binding of the C-terminal I/LWEQ (THATCH) module, coupling coat assembly to actin regulation [PMID:11889126, PMID:15533940, PMID:15533941, PMID:18790740, PMID:15581353]. Live-cell imaging places HIP1 at early clathrin-coated pits during pit maturation, and HIP1-null mice show defective endocytic complex assembly and impaired clathrin-mediated internalization of GluR1 AMPA receptors; HIP1 associates with NMDA receptors and is required for NMDA-induced AMPA receptor internalization, long-term depression, and excitotoxicity, while also stabilizing endocytosed receptor tyrosine kinases [PMID:19626275, PMID:12839988, PMID:17329427, PMID:14732715]. Through its discovery as a polyglutamine-sensitive huntingtin partner, HIP1 connects to a death pathway: free HIP1 heterodimerizes with Hippi to recruit procaspase-8 and initiate extrinsic apoptosis, and acts as a nuclear transporter for Hippi, which binds promoters of caspase-1/-8/-10 and REST/NRSF to activate their transcription [PMID:9140394, PMID:11788820, PMID:19934260, PMID:21832040]. In disease, HIP1 functions as a constitutively active oncogenic fusion partner of ALK in NSCLC and promotes RTK-driven invasion through integrin turnover and RAC1 activation [PMID:24496003, PMID:24518094, PMID:24790222, PMID:30049830].","teleology":[{"year":1997,"claim":"Established HIP1's founding biological context by showing it is a huntingtin-interacting protein whose binding is inversely sensitive to polyglutamine length, tying it to both the neuronal cytoskeleton and Huntington's disease.","evidence":"Yeast two-hybrid, co-localization, and biochemical interaction assays in brain","pmids":["9140394"],"confidence":"High","gaps":["Did not define HIP1's intrinsic molecular function","Mechanism by which polyQ expansion releases HIP1 not resolved"]},{"year":2001,"claim":"Defined HIP1 as a clathrin-coated vesicle adaptor by mapping direct binding to clathrin heavy chain and AP-2 and showing dominant-negative fragments block clathrin-mediated endocytosis, and reconstituted ENTH-anchored, AP-2-dependent clathrin recruitment to lipid bilayers.","evidence":"CCV purification, direct binding/deletion mapping, dominant-negative endocytosis block, liposome recruitment and clathrin assembly assays in vitro","pmids":["11517213","11532990","11577110"],"confidence":"High","gaps":["Cargo specificity in cells not yet established","Role of actin-binding module not addressed"]},{"year":2002,"claim":"Resolved how HIP1 stimulates coat assembly versus binds actin, showing the central helical domain binds clathrin light chain to drive assembly while HIP1 (unlike paralogue HIP12) does not sediment with F-actin in vitro.","evidence":"In vitro binding, clathrin assembly assays, F-actin co-sedimentation, deletion/mutation mapping","pmids":["11889126"],"confidence":"High","gaps":["Apparent lack of HIP1 actin binding later refined by intrasteric regulation findings","In vivo relevance of assembly stimulation untested here"]},{"year":2002,"claim":"Connected HIP1 to apoptosis by demonstrating that huntingtin-released HIP1 heterodimerizes with Hippi through pseudo-death-effector domains and recruits procaspase-8, defining a death-receptor-independent extrinsic apoptotic trigger.","evidence":"Reciprocal Co-IP, yeast two-hybrid, caspase-8 recruitment and apoptosis assays","pmids":["11788820"],"confidence":"High","gaps":["Structural basis of the pseudo-DED interaction undefined at this stage","In vivo contribution to HD neuronal death not quantified"]},{"year":2003,"claim":"Provided in vivo proof that HIP1 is required for clathrin-mediated receptor trafficking, with knockout mice showing neurological deficits and a dose-dependent defect in GluR1 AMPA receptor internalization.","evidence":"Targeted gene knockout, neuronal internalization assays, liposome endocytic-complex assembly assay","pmids":["12839988"],"confidence":"High","gaps":["Whether trafficking defect alone causes the neurological phenotype unresolved","Other cargo beyond AMPA receptors not surveyed"]},{"year":2004,"claim":"Defined the molecular interface and regulatory logic of clathrin assembly stimulation, identifying the CLC regulatory sequence and HIP1 residues L451/L452/R453 as required for assembly and CCV targeting, and showing CLC overexpression perturbs actin distribution.","evidence":"CLC and HIP1 mutagenesis, in vitro clathrin assembly assay, subcellular localization, in vivo actin distribution analysis","pmids":["15533940","15533941"],"confidence":"High","gaps":["How CLC binding mechanistically couples to actin not yet established","Separation of assembly from dimerization functions only partially mapped"]},{"year":2004,"claim":"Extended HIP1's roles beyond coat assembly, showing ENTH-domain binding to PI(3,4)P2/PI(3,5)P2 and a function in stabilizing endocytosed receptor tyrosine kinases, while ENTH deletion triggers apoptosis.","evidence":"Lipid-binding assays with ENTH mutants, receptor half-life measurements, apoptosis assays","pmids":["14732715"],"confidence":"Medium","gaps":["Single lab with two methods","Mechanism linking ENTH deletion to apoptosis unclear"]},{"year":2004,"claim":"Characterized the actin-binding module as intrasterically autoinhibited, explaining why full-length HIP1 actin binding is conditional and showing the I/LWEQ module stabilizes filaments and harbors a dimerization motif.","evidence":"F-actin co-sedimentation, affinity measurements, truncation/mutagenesis of the I/LWEQ module","pmids":["15581353"],"confidence":"Medium","gaps":["Physiological trigger relieving autoinhibition not identified here","Single lab in vitro analysis"]},{"year":2006,"claim":"Provided structural insight into the coiled-coil dimerization domain, revealing a partially splayed-open dimer and a candidate CLC-interaction surface.","evidence":"X-ray crystallography of residues 482-586 at 2.8 Å","pmids":["17257618"],"confidence":"Medium","gaps":["Proposed S3 CLC-binding surface not functionally validated in the study","Static structure does not capture conformational regulation"]},{"year":2007,"claim":"Structurally ruled out a canonical death-effector-domain fold for the Hippi-interaction module and proposed a basic surface as the binding site.","evidence":"X-ray crystallography of subfragment 371-481 at 2.8 Å with structural comparison","pmids":["18155047"],"confidence":"Medium","gaps":["Hippi-binding surface assignment is structural inference without mutagenesis","Does not explain pseudo-DED functional behavior"]},{"year":2007,"claim":"Demonstrated HIP1's requirement for NMDA-receptor-dependent synaptic plasticity and neuroprotection, showing physical association with NMDARs, impaired NMDA-induced AMPA internalization and LTD, and partial protection from excitotoxicity in knockout neurons.","evidence":"GST pull-down, Co-IP, internalization assays in KO neurons, LTD electrophysiology, excitotoxicity assays","pmids":["17329427"],"confidence":"High","gaps":["Direct versus indirect NMDAR association not fully distinguished","Link to Akt/huntingtin phosphorylation mechanistically open"]},{"year":2008,"claim":"Unified coat assembly and actin regulation by showing clathrin light chain binding induces a compact coiled-coil conformation that suppresses THATCH-domain actin binding, establishing CLC as a negative regulator of HIP1-actin interactions.","evidence":"Calorimetry, analytical ultracentrifugation, CD, actin co-sedimentation","pmids":["18790740"],"confidence":"High","gaps":["In vivo timing of this conformational switch during endocytosis not measured","Whether HIP1 heterodimerizes with HIP1R in vivo remains unsettled"]},{"year":2009,"claim":"Placed HIP1 temporally and spatially in coated-pit maturation by live imaging, showing early recruitment, loss after vesicle closure, clathrin-dependent membrane localization, and dominant-negative inhibition of transferrin uptake.","evidence":"Live-cell imaging, pHluorin-transferrin assay, shRNA clathrin knockdown, dominant-negative fragment expression","pmids":["19626275"],"confidence":"Medium","gaps":["Single lab","Quantitative kinetics relative to other coat proteins limited"]},{"year":2009,"claim":"Defined a nuclear, transcriptional arm of HIP1/Hippi signaling, showing HIP1 acts as nuclear transporter for Hippi, which binds caspase-1/-8/-10 promoters to upregulate them.","evidence":"Luciferase reporters, ChIP, R393E mutagenesis, HIP1 NLS deletion and knockdown","pmids":["19934260"],"confidence":"Medium","gaps":["Single lab","Physiological stimulus driving nuclear translocation not defined"]},{"year":2011,"claim":"Connected the nuclear HIP1/Hippi function to Huntington's disease pathology, showing reduced mutant-huntingtin binding increases nuclear HIP1/Hippi, REST promoter occupancy and REST upregulation, repressing BDNF and proenkephalin.","evidence":"ChIP, luciferase reporter, HIP1 overexpression/knockdown, NLS mutation, polyQ HD model","pmids":["21832040"],"confidence":"Medium","gaps":["Single lab","Endogenous quantitative contribution to HD transcriptional dysregulation untested"]},{"year":2014,"claim":"Identified HIP1 as an oncogenic driver, both as a constitutively active ALK fusion partner in NSCLC and as a c-Met effector promoting β1-integrin turnover and mesenchymal invasion.","evidence":"RNA-seq/RT-PCR/sequencing and crizotinib PDX study; siRNA screen, integrin trafficking and invasion assays","pmids":["24496003","24518094","24790222"],"confidence":"Medium","gaps":["How the endocytic adaptor function relates to fusion oncogenicity unclear","Generality across tumor types not established"]},{"year":2018,"claim":"Broadened HIP1's signaling and physiological roles, showing it is required for PDGFR/RTK-driven RAC1 activation and invasion in arthritis, and that its degenerative phenotype involves choline metabolism (Gdpd3) and is not brain-autonomous.","evidence":"siRNA knockdown, RAC1 activation/invasion assays, KO arthritis model; conditional KO, tissue-specific rescue, metabolomics, double-KO epistasis","pmids":["30049830","30224518"],"confidence":"Medium","gaps":["Mechanistic link between endocytic adaptor activity and choline metabolism unresolved","Tissue of origin of degenerative phenotype not pinpointed"]},{"year":2022,"claim":"Implicated HIP1 in prostate cancer signaling as a stabilized partner of UGT2B28 priming AR/EGFR-ERK1/2-driven proliferation and EMT.","evidence":"Co-IP, siRNA knockdown, ERK1/2/AR/EGFR signaling and proliferation assays","pmids":["36343786"],"confidence":"Medium","gaps":["Single lab with limited mechanistic depth on HIP1 specifically","Direct versus indirect role of HIP1 in receptor signaling unclear"]},{"year":null,"claim":"How HIP1's conformational regulation, lipid/actin/clathrin coupling, and nuclear apoptotic/transcriptional functions are integrated and switched in living cells, and how its endocytic activity mechanistically underlies its oncogenic and metabolic roles, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking membrane and nuclear functions","Physiological triggers for HIP1 release from huntingtin and nuclear translocation undefined","Connection between endocytic adaptor mechanism and cancer/metabolic phenotypes unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,4]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2,8]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[9,4,13]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[15,16]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[1,2,14]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[14,8]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[15,16]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[9,6]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,2,5,14]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[18,19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[17,0]}],"complexes":["clathrin coat","HIP1/Hippi heterodimer"],"partners":["HTT","CLTC","AP2","CLTA","HIPPI","GRIN1","ALK","UGT2B28"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00291","full_name":"Huntingtin-interacting protein 1","aliases":["Huntingtin-interacting protein I","HIP-I"],"length_aa":1037,"mass_kda":116.2,"function":"Plays a role in clathrin-mediated endocytosis and trafficking (PubMed:11532990, PubMed:11577110, PubMed:11889126). Involved in regulating AMPA receptor trafficking in the central nervous system in an NMDA-dependent manner (By similarity). Regulates presynaptic nerve terminal activity (By similarity). Enhances androgen receptor (AR)-mediated transcription (PubMed:16027218). May act as a proapoptotic protein that induces cell death by acting through the intrinsic apoptosis pathway (PubMed:11007801). Binds 3-phosphoinositides (via ENTH domain) (PubMed:14732715). May act through the ENTH domain to promote cell survival by stabilizing receptor tyrosine kinases following ligand-induced endocytosis (PubMed:14732715). May play a functional role in the cell filament networks (PubMed:18790740). May be required for differentiation, proliferation, and/or survival of somatic and germline progenitors (PubMed:11007801, PubMed:12163454)","subcellular_location":"Cytoplasm; Nucleus; Endomembrane system; Cytoplasmic vesicle, clathrin-coated vesicle membrane","url":"https://www.uniprot.org/uniprotkb/O00291/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HIP1","classification":"Not 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1.2-MB","url":"https://www.omim.org/entry/613729"},{"mim_id":"609523","title":"ALDEHYDE DEHYDROGENASE, FAMILY 3, SUBFAMILY A, MEMBER 2; ALDH3A2","url":"https://www.omim.org/entry/609523"},{"mim_id":"607785","title":"JUVENILE MYELOMONOCYTIC LEUKEMIA; JMML","url":"https://www.omim.org/entry/607785"},{"mim_id":"606621","title":"INTRAFLAGELLAR TRANSPORT 57; IFT57","url":"https://www.omim.org/entry/606621"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Vesicles","reliability":"Supported"},{"location":"Acrosome","reliability":"Additional"},{"location":"Mid piece","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HIP1"},"hgnc":{"alias_symbol":["ILWEQ"],"prev_symbol":[]},"alphafold":{"accession":"O00291","domains":[{"cath_id":"-","chopping":"31-126","consensus_level":"medium","plddt":94.0284,"start":31,"end":126},{"cath_id":"1.20.1420.10","chopping":"617-768","consensus_level":"medium","plddt":86.6332,"start":617,"end":768},{"cath_id":"1.20.1410.10","chopping":"781-963","consensus_level":"high","plddt":91.0528,"start":781,"end":963},{"cath_id":"1.20.58","chopping":"157-315","consensus_level":"medium","plddt":89.1995,"start":157,"end":315},{"cath_id":"1.20.5","chopping":"973-1006","consensus_level":"medium","plddt":84.0468,"start":973,"end":1006}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00291","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00291-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00291-F1-predicted_aligned_error_v6.png","plddt_mean":80.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HIP1","jax_strain_url":"https://www.jax.org/strain/search?query=HIP1"},"sequence":{"accession":"O00291","fasta_url":"https://rest.uniprot.org/uniprotkb/O00291.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00291/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00291"}},"corpus_meta":[{"pmid":"9140394","id":"PMC_9140394","title":"HIP1, 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Expression of HIP1 fragments potently blocks clathrin-mediated endocytosis.\",\n      \"method\": \"CCV purification, co-immunoprecipitation, direct binding assays, deletion mapping, dominant-negative overexpression with endocytosis block readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro binding with deletion mutants, CCV purification, functional dominant-negative assay, replicated by multiple independent labs (Metzler et al., Waelter et al., Mishra et al., all 2001)\",\n      \"pmids\": [\"11517213\", \"11532990\", \"11577110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"HIP1 binds both AP-2 and clathrin via discrete modular interaction sequences analogous to those in epsin and AP180; anchored to a phosphoinositide-containing membrane via its ENTH domain, HIP1 associates with AP-2 and together they efficiently recruit clathrin to the bilayer, implicating HIP1 in lipid-regulated clathrin lattice biogenesis.\",\n      \"method\": \"In vitro binding assays, liposome recruitment assays, clathrin assembly assays, CCV co-purification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted lipid-binding and clathrin assembly in vitro with modular deletion analysis, multiple orthogonal methods\",\n      \"pmids\": [\"11577110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Free Hip-1 (released from huntingtin upon polyglutamine expansion) binds the novel protein Hippi via their pseudo-death-effector domains to form a heterodimer; this Hip-1/Hippi heterodimer recruits procaspase-8 into a ternary complex, initiating apoptosis through the extrinsic caspase-8 pathway independent of death receptors.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, caspase-8 recruitment assay, apoptosis assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, complex reconstitution, functional caspase recruitment and apoptosis assay, replicated in multiple cell types\",\n      \"pmids\": [\"11788820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HIP1 and its paralogue HIP12 are major components of the clathrin coat; HIP1 contains a clathrin-box and AP2 consensus-binding sites mediating high-affinity binding to clathrin heavy chain terminal domain and AP2 alpha-ear, respectively. Both HIP1 and HIP12 stimulate clathrin assembly through their central helical domain, which binds directly to clathrin light chain. HIP12 (unlike HIP1) co-sediments with F-actin while HIP1 does not bind actin in vitro.\",\n      \"method\": \"In vitro binding assays, clathrin assembly assays, F-actin co-sedimentation, deletion/mutation mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding with mutagenesis, clathrin assembly assay, F-actin sedimentation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"11889126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"HIP1 knockout mice (HIP1−/−) develop neurological deficits (tremor, gait ataxia, kyphosis), decreased assembly of endocytic protein complexes on liposomal membranes, and a dose-dependent defect in clathrin-mediated internalization of GluR1-containing AMPA receptors in hippocampal neurons, demonstrating that HIP1 is required for AMPA receptor trafficking via clathrin-mediated endocytosis.\",\n      \"method\": \"Targeted gene knockout in mice, internalization assays in primary neurons, liposome-based endocytic complex assembly assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean in vivo KO with specific cellular phenotype (AMPA receptor trafficking defect), orthogonal in vitro assembly assay, replicated across neuronal preparations\",\n      \"pmids\": [\"12839988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HIP1 (and HIP1R) directly interact with the conserved 22-amino-acid regulatory sequence of clathrin light chains (CLC); the regulatory N-terminal residues of this CLC sequence mediate the interaction and are required for HIP1/HIP1R stimulation of clathrin assembly in vitro. In vivo overexpression of the Hip1R-binding fragment of CLC disrupts actin distribution.\",\n      \"method\": \"In vitro binding assays with CLC mutants, clathrin assembly assay, in vivo actin distribution analysis upon overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of CLC binding interface + in vitro clathrin assembly readout + in vivo actin phenotype, replicated in companion paper (Legendre-Guillemin et al. 2004)\",\n      \"pmids\": [\"15533940\", \"15533941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Residues Leu-451, Leu-452, and Arg-453 within HIP1's central helical domain (aa 450–456) are required for clathrin light chain (CLC) binding; CLC-binding mutants fail to promote clathrin assembly in vitro, are unable to target to clathrin-coated pits and vesicles in cells, but still support HIP1 homodimerization and heterodimerization with HIP1R.\",\n      \"method\": \"Site-directed mutagenesis, in vitro clathrin assembly assay, subcellular localization by fluorescence microscopy, dimerization assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis coupled with in vitro functional assay and in vivo localization, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"15533941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HIP1 binds 3-phosphate-containing inositol lipids (PI(3,4)P2 and PI(3,5)P2) preferentially via its ENTH domain; this ENTH domain is necessary for lipid binding, and ENTH-deleted HIP1 induces apoptosis. Full-length HIP1 stabilizes pools of growth factor receptors (receptor tyrosine kinases) by prolonging their half-life following ligand-induced endocytosis.\",\n      \"method\": \"Lipid-binding assays with ENTH domain mutants, receptor half-life measurements after ligand stimulation, apoptosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct lipid binding shown with domain deletion; receptor stabilization measured biochemically; single lab, two methods\",\n      \"pmids\": [\"14732715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The I/LWEQ module (C-terminal actin-binding domain) of HIP1 binds F-actin, but actin binding is regulated by intrasteric inhibition: a conserved structural element within the I/LWEQ module occludes the primary actin-binding determinants of HIP1 and other family members (Talin1, Talin2, Hip12). The I/LWEQ module also contains a dimerization motif and stabilizes actin filaments against depolymerization.\",\n      \"method\": \"F-actin co-sedimentation assays, affinity measurements, truncation/mutagenesis analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro actin binding assays with multiple constructs demonstrating intrasteric inhibition mechanism, single lab\",\n      \"pmids\": [\"15581353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of the HIP1 coiled-coil domain (residues 482–586) at 2.8 Å reveals a partially splayed-open dimeric coiled-coil; structural analysis identified a hydrophobic surface path (S3) proposed as the clathrin light chain interaction surface.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure solved at 2.8 Å with structural interpretation, but functional validation of the S3 surface was not experimentally confirmed within this paper\",\n      \"pmids\": [\"17257618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of HIP1 subfragment 371–481 at 2.8 Å reveals a partially opened coiled-coil with a basic surface near residues F432 and K474 proposed as the HIPPI-binding site, and a highly negatively charged adjacent region. This structure rules out a death-effector domain fold for the HIPPI-interaction module.\",\n      \"method\": \"X-ray crystallography, structural comparison\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure solved at 2.8 Å; functional assignment of the basic surface to HIPPI binding is structural inference without direct mutagenesis confirmation in this paper\",\n      \"pmids\": [\"18155047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIP1 colocalizes with NMDARs in hippocampal and cortical neurons and affinity-purifies with NMDARs by GST pull-down and co-immunoprecipitation. In HIP1−/− neurons, NMDA-induced AMPA receptor internalization is reduced by 75%, long-term depression is impaired, and neurons are partially protected from NMDA-induced excitotoxicity. HIP1 also modulates NMDA-induced phosphorylation of Akt and huntingtin.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, quantitative AMPA receptor internalization assay in KO neurons, LTD electrophysiology in brain slices, LDH/TUNEL/caspase-3 excitotoxicity assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal pull-down and Co-IP, clean KO with multiple orthogonal cellular phenotypes (internalization, LTD, excitotoxicity), all in same study\",\n      \"pmids\": [\"17329427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Clathrin light chain (CLC) binding to Hip1 (and Hip1R) induces a compact conformation of their coiled-coil domains and significantly reduces actin binding by their THATCH (I/LWEQ) domains; thus clathrin light chain acts as a negative regulator of Hip1-actin interactions. Hip1 coiled-coil homodimers do not heterodimerize with Hip1R in vitro.\",\n      \"method\": \"Biophysical analysis (calorimetry, analytical ultracentrifugation, CD), actin co-sedimentation assay, conformational analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biophysical methods demonstrating CLC-induced conformational change and its functional consequence on actin binding, single lab\",\n      \"pmids\": [\"18790740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Live-cell imaging shows HIP1 is recruited early to clathrin-coated pits at the plasma membrane and is absent from newly internalized vesicles (after vesicle closure); shRNA knockdown of clathrin compromises HIP1 membrane localization. An HIP1 fragment lacking ANTH and Talin-like domains inhibits transferrin internalization while retaining membrane clathrin co-localization, placing HIP1 function in pit maturation and coated vesicle formation.\",\n      \"method\": \"Live-cell fluorescence imaging, pHluorin-tagged transferrin receptor assay, shRNA knockdown, dominant-negative fragment expression\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct live-imaging localization tied to functional consequence, plus shRNA and dominant-negative dissection; single lab\",\n      \"pmids\": [\"19626275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The HIP1/Hippi heterodimer (via HIP-1 as nuclear transporter) accumulates in the nucleus and the pseudo-death-effector domain of HIPPI binds to specific promoter motifs of caspase-1, -8, and -10 genes, increasing their transcription. Residue R393 of HIPPI is critical for promoter binding; HIP-1 nuclear localization signal is required for HIPPI nuclear translocation and consequent caspase-1 upregulation.\",\n      \"method\": \"Luciferase reporter assay, chromatin immunoprecipitation (ChIP), mutagenesis (R393E), HIP-1 NLS deletion, HIP-1 knockdown\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter + ChIP + mutagenesis in single lab; NLS deletion mechanistically places HIP1 as nuclear transporter of HIPPI\",\n      \"pmids\": [\"19934260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HIPPI (HIP-1 protein interactor) directly binds the promoter of REST/NRSF and activates its transcription; this activation requires HIP1 as the nuclear transporter of HIPPI. In a HD cell model, reduced interaction of mutant huntingtin with HIP1 leads to increased nuclear accumulation of HIPPI/HIP1, greater REST promoter occupancy, REST upregulation, and consequent repression of BDNF and proenkephalin.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, HIP1 overexpression/knockdown, NLS mutation, huntingtin polyQ model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirming promoter occupancy, reporter assay, mechanistic dissection with NLS mutant; single lab\",\n      \"pmids\": [\"21832040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HIP1 is identified as a fusion partner of ALK (anaplastic lymphoma kinase) in NSCLC; the HIP1-ALK fusion protein (exon 28 of HIP1 fused to exon 20 of ALK) is constitutively active and drives tumor growth in a patient-derived xenograft model that is sensitive to the ALK inhibitor crizotinib in vivo.\",\n      \"method\": \"RNA-seq, RT-PCR, genomic sequencing, in vivo PDX efficacy study with crizotinib\",\n      \"journal\": \"Journal of thoracic oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fusion gene characterized by sequencing and confirmed oncogenic activity by in vivo PDX pharmacology; replicated in multiple independent case reports\",\n      \"pmids\": [\"24496003\", \"24518094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HIP1 mediates HGF-induced c-Met signaling by promoting β1-integrin turnover (increased endocytosis), which is required for c-Met-driven mesenchymal-type cell invasion. siRNA screen identified HIP1 as a crucial c-Met effector for this morphological/invasive outcome.\",\n      \"method\": \"High-throughput siRNA screen, integrin trafficking assay, invasion assay, c-Met activation assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional siRNA screen with specific invasion readout, integrin turnover measured; single lab\",\n      \"pmids\": [\"24790222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HIP1 is required for PDGFR-mediated RAC1 activation and lamellipodia formation in fibroblast-like synoviocytes; knockdown of HIP1 reduces receptor tyrosine kinase responses, RAC1 activation, and invasiveness. HIP1 knockout mice are protected in KRN serum-induced arthritis, demonstrating an in vivo role for HIP1 in joint disease severity via RTK/Rac1 signaling.\",\n      \"method\": \"siRNA knockdown, RAC1 activation assay, invasion assay, HIP1 KO mouse model with arthritis induction\",\n      \"journal\": \"Annals of the rheumatic diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse in vivo plus mechanistic cell-based assays; single lab with two orthogonal approaches\",\n      \"pmids\": [\"30049830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In HIP1-deficient mice, phosphocholine levels are low and Gdpd3 (lysophospholipase D) expression is reduced. Brain-specific rescue of HIP1 expression does not rescue the phenotype, whereas expression in kidney, spleen, and liver does, indicating the degenerative phenotype is not brain-autonomous. Double knockout of Gdpd3 and Hip1 worsens the Hip1 phenotype, suggesting Gdpd3 compensates for Hip1 loss in choline metabolism.\",\n      \"method\": \"Conditional knockout (Cre/lox), tissue-specific rescue with Cre drivers, metabolomics (phosphocholine), microarray, double KO genetic interaction\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via double KO + conditional tissue rescue; metabolomics readout; single lab\",\n      \"pmids\": [\"30224518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"UGT2B28 physically associates with HIP1, stabilizing it and priming AR and EGFR signaling pathways leading to ERK1/2 activation, cell proliferation, and EMT in prostate cancer; HIP1 knockdown in UGT2B28-positive cells abolishes these proliferative advantages.\",\n      \"method\": \"Co-immunoprecipitation (protein-protein interaction), siRNA knockdown, signaling pathway assays (ERK1/2, AR, EGFR), cell proliferation assay\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP establishing partnership, functional knockdown assay; single lab, limited mechanistic depth on HIP1 specifically\",\n      \"pmids\": [\"36343786\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HIP1 is a multi-domain endocytic adaptor protein that co-localizes with clathrin-coated vesicles and directly binds clathrin heavy chain (via a clathrin-box), clathrin light chain (via its coiled-coil domain, regulated by CLC-induced conformational change that suppresses actin binding), and the AP-2 adaptor complex (via DPF-like motifs), thereby promoting clathrin lattice assembly and membrane internalization of cargo including AMPA and NMDA receptors; when released from huntingtin (as occurs with polyglutamine expansion), free HIP1 heterodimerizes with Hippi to recruit procaspase-8 and initiate extrinsic apoptosis, and the HIP1/Hippi complex also translocates to the nucleus to transcriptionally activate caspase genes and REST, linking endocytic function to apoptotic and transcriptional regulation in the context of Huntington's disease.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HIP1 is a multi-domain endocytic adaptor that links clathrin-coated vesicle assembly to actin dynamics, receptor trafficking, and—in the context of huntingtin biology—apoptotic and transcriptional regulation [#1, #5]. It co-purifies with brain clathrin-coated vesicles and directly binds the clathrin heavy chain terminal domain and the AP-2 adaptor complex through discrete modular clathrin-box and AP2-binding motifs, while membrane anchoring through its ENTH domain, which binds 3-phosphate phosphoinositides, allows HIP1 and AP-2 to recruit clathrin to the bilayer and nucleate lattice biogenesis [#1, #2, #8]. Its central helical/coiled-coil domain binds clathrin light chain through residues Leu-451/Leu-452/Arg-453 and stimulates clathrin assembly; light-chain binding drives a compact coiled-coil conformation that suppresses the intrasterically regulated F-actin binding of the C-terminal I/LWEQ (THATCH) module, coupling coat assembly to actin regulation [#4, #6, #7, #13, #9]. Live-cell imaging places HIP1 at early clathrin-coated pits during pit maturation, and HIP1-null mice show defective endocytic complex assembly and impaired clathrin-mediated internalization of GluR1 AMPA receptors; HIP1 associates with NMDA receptors and is required for NMDA-induced AMPA receptor internalization, long-term depression, and excitotoxicity, while also stabilizing endocytosed receptor tyrosine kinases [#14, #5, #12, #8]. Through its discovery as a polyglutamine-sensitive huntingtin partner, HIP1 connects to a death pathway: free HIP1 heterodimerizes with Hippi to recruit procaspase-8 and initiate extrinsic apoptosis, and acts as a nuclear transporter for Hippi, which binds promoters of caspase-1/-8/-10 and REST/NRSF to activate their transcription [#0, #3, #15, #16]. In disease, HIP1 functions as a constitutively active oncogenic fusion partner of ALK in NSCLC and promotes RTK-driven invasion through integrin turnover and RAC1 activation [#17, #18, #19].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established HIP1's founding biological context by showing it is a huntingtin-interacting protein whose binding is inversely sensitive to polyglutamine length, tying it to both the neuronal cytoskeleton and Huntington's disease.\",\n      \"evidence\": \"Yeast two-hybrid, co-localization, and biochemical interaction assays in brain\",\n      \"pmids\": [\"9140394\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define HIP1's intrinsic molecular function\", \"Mechanism by which polyQ expansion releases HIP1 not resolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined HIP1 as a clathrin-coated vesicle adaptor by mapping direct binding to clathrin heavy chain and AP-2 and showing dominant-negative fragments block clathrin-mediated endocytosis, and reconstituted ENTH-anchored, AP-2-dependent clathrin recruitment to lipid bilayers.\",\n      \"evidence\": \"CCV purification, direct binding/deletion mapping, dominant-negative endocytosis block, liposome recruitment and clathrin assembly assays in vitro\",\n      \"pmids\": [\"11517213\", \"11532990\", \"11577110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo specificity in cells not yet established\", \"Role of actin-binding module not addressed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved how HIP1 stimulates coat assembly versus binds actin, showing the central helical domain binds clathrin light chain to drive assembly while HIP1 (unlike paralogue HIP12) does not sediment with F-actin in vitro.\",\n      \"evidence\": \"In vitro binding, clathrin assembly assays, F-actin co-sedimentation, deletion/mutation mapping\",\n      \"pmids\": [\"11889126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apparent lack of HIP1 actin binding later refined by intrasteric regulation findings\", \"In vivo relevance of assembly stimulation untested here\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Connected HIP1 to apoptosis by demonstrating that huntingtin-released HIP1 heterodimerizes with Hippi through pseudo-death-effector domains and recruits procaspase-8, defining a death-receptor-independent extrinsic apoptotic trigger.\",\n      \"evidence\": \"Reciprocal Co-IP, yeast two-hybrid, caspase-8 recruitment and apoptosis assays\",\n      \"pmids\": [\"11788820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the pseudo-DED interaction undefined at this stage\", \"In vivo contribution to HD neuronal death not quantified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Provided in vivo proof that HIP1 is required for clathrin-mediated receptor trafficking, with knockout mice showing neurological deficits and a dose-dependent defect in GluR1 AMPA receptor internalization.\",\n      \"evidence\": \"Targeted gene knockout, neuronal internalization assays, liposome endocytic-complex assembly assay\",\n      \"pmids\": [\"12839988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether trafficking defect alone causes the neurological phenotype unresolved\", \"Other cargo beyond AMPA receptors not surveyed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the molecular interface and regulatory logic of clathrin assembly stimulation, identifying the CLC regulatory sequence and HIP1 residues L451/L452/R453 as required for assembly and CCV targeting, and showing CLC overexpression perturbs actin distribution.\",\n      \"evidence\": \"CLC and HIP1 mutagenesis, in vitro clathrin assembly assay, subcellular localization, in vivo actin distribution analysis\",\n      \"pmids\": [\"15533940\", \"15533941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CLC binding mechanistically couples to actin not yet established\", \"Separation of assembly from dimerization functions only partially mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended HIP1's roles beyond coat assembly, showing ENTH-domain binding to PI(3,4)P2/PI(3,5)P2 and a function in stabilizing endocytosed receptor tyrosine kinases, while ENTH deletion triggers apoptosis.\",\n      \"evidence\": \"Lipid-binding assays with ENTH mutants, receptor half-life measurements, apoptosis assays\",\n      \"pmids\": [\"14732715\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab with two methods\", \"Mechanism linking ENTH deletion to apoptosis unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Characterized the actin-binding module as intrasterically autoinhibited, explaining why full-length HIP1 actin binding is conditional and showing the I/LWEQ module stabilizes filaments and harbors a dimerization motif.\",\n      \"evidence\": \"F-actin co-sedimentation, affinity measurements, truncation/mutagenesis of the I/LWEQ module\",\n      \"pmids\": [\"15581353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological trigger relieving autoinhibition not identified here\", \"Single lab in vitro analysis\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided structural insight into the coiled-coil dimerization domain, revealing a partially splayed-open dimer and a candidate CLC-interaction surface.\",\n      \"evidence\": \"X-ray crystallography of residues 482-586 at 2.8 Å\",\n      \"pmids\": [\"17257618\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Proposed S3 CLC-binding surface not functionally validated in the study\", \"Static structure does not capture conformational regulation\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Structurally ruled out a canonical death-effector-domain fold for the Hippi-interaction module and proposed a basic surface as the binding site.\",\n      \"evidence\": \"X-ray crystallography of subfragment 371-481 at 2.8 Å with structural comparison\",\n      \"pmids\": [\"18155047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Hippi-binding surface assignment is structural inference without mutagenesis\", \"Does not explain pseudo-DED functional behavior\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated HIP1's requirement for NMDA-receptor-dependent synaptic plasticity and neuroprotection, showing physical association with NMDARs, impaired NMDA-induced AMPA internalization and LTD, and partial protection from excitotoxicity in knockout neurons.\",\n      \"evidence\": \"GST pull-down, Co-IP, internalization assays in KO neurons, LTD electrophysiology, excitotoxicity assays\",\n      \"pmids\": [\"17329427\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect NMDAR association not fully distinguished\", \"Link to Akt/huntingtin phosphorylation mechanistically open\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Unified coat assembly and actin regulation by showing clathrin light chain binding induces a compact coiled-coil conformation that suppresses THATCH-domain actin binding, establishing CLC as a negative regulator of HIP1-actin interactions.\",\n      \"evidence\": \"Calorimetry, analytical ultracentrifugation, CD, actin co-sedimentation\",\n      \"pmids\": [\"18790740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo timing of this conformational switch during endocytosis not measured\", \"Whether HIP1 heterodimerizes with HIP1R in vivo remains unsettled\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed HIP1 temporally and spatially in coated-pit maturation by live imaging, showing early recruitment, loss after vesicle closure, clathrin-dependent membrane localization, and dominant-negative inhibition of transferrin uptake.\",\n      \"evidence\": \"Live-cell imaging, pHluorin-transferrin assay, shRNA clathrin knockdown, dominant-negative fragment expression\",\n      \"pmids\": [\"19626275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Quantitative kinetics relative to other coat proteins limited\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined a nuclear, transcriptional arm of HIP1/Hippi signaling, showing HIP1 acts as nuclear transporter for Hippi, which binds caspase-1/-8/-10 promoters to upregulate them.\",\n      \"evidence\": \"Luciferase reporters, ChIP, R393E mutagenesis, HIP1 NLS deletion and knockdown\",\n      \"pmids\": [\"19934260\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Physiological stimulus driving nuclear translocation not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected the nuclear HIP1/Hippi function to Huntington's disease pathology, showing reduced mutant-huntingtin binding increases nuclear HIP1/Hippi, REST promoter occupancy and REST upregulation, repressing BDNF and proenkephalin.\",\n      \"evidence\": \"ChIP, luciferase reporter, HIP1 overexpression/knockdown, NLS mutation, polyQ HD model\",\n      \"pmids\": [\"21832040\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Endogenous quantitative contribution to HD transcriptional dysregulation untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified HIP1 as an oncogenic driver, both as a constitutively active ALK fusion partner in NSCLC and as a c-Met effector promoting β1-integrin turnover and mesenchymal invasion.\",\n      \"evidence\": \"RNA-seq/RT-PCR/sequencing and crizotinib PDX study; siRNA screen, integrin trafficking and invasion assays\",\n      \"pmids\": [\"24496003\", \"24518094\", \"24790222\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How the endocytic adaptor function relates to fusion oncogenicity unclear\", \"Generality across tumor types not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Broadened HIP1's signaling and physiological roles, showing it is required for PDGFR/RTK-driven RAC1 activation and invasion in arthritis, and that its degenerative phenotype involves choline metabolism (Gdpd3) and is not brain-autonomous.\",\n      \"evidence\": \"siRNA knockdown, RAC1 activation/invasion assays, KO arthritis model; conditional KO, tissue-specific rescue, metabolomics, double-KO epistasis\",\n      \"pmids\": [\"30049830\", \"30224518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between endocytic adaptor activity and choline metabolism unresolved\", \"Tissue of origin of degenerative phenotype not pinpointed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Implicated HIP1 in prostate cancer signaling as a stabilized partner of UGT2B28 priming AR/EGFR-ERK1/2-driven proliferation and EMT.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, ERK1/2/AR/EGFR signaling and proliferation assays\",\n      \"pmids\": [\"36343786\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab with limited mechanistic depth on HIP1 specifically\", \"Direct versus indirect role of HIP1 in receptor signaling unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HIP1's conformational regulation, lipid/actin/clathrin coupling, and nuclear apoptotic/transcriptional functions are integrated and switched in living cells, and how its endocytic activity mechanistically underlies its oncogenic and metabolic roles, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking membrane and nuclear functions\", \"Physiological triggers for HIP1 release from huntingtin and nuclear translocation undefined\", \"Connection between endocytic adaptor mechanism and cancer/metabolic phenotypes unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 4]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [9, 4, 13]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [1, 2, 14]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14, 8]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [15, 16]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [9, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 2, 5, 14]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [18, 19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [17, 0]}\n    ],\n    \"complexes\": [\"clathrin coat\", \"HIP1/Hippi heterodimer\"],\n    \"partners\": [\"HTT\", \"CLTC\", \"AP2\", \"CLTA\", \"HIPPI\", \"GRIN1\", \"ALK\", \"UGT2B28\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}