{"gene":"GPRASP2","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2004,"finding":"GPRASP2 (GASP2) was identified as a direct interaction partner of huntingtin (htt) via yeast two-hybrid screening, and this interaction was validated by membrane-based and classical co-immunoprecipitation assays in co-transfected mammalian cells. The two proteins co-localize in SH-SY5Y neuronal cells, suggesting that huntingtin may influence G protein-coupled receptor trafficking via its interaction with GASP2.","method":"Yeast two-hybrid screening, membrane-based co-immunoprecipitation, classical co-immunoprecipitation, immunofluorescence co-localization in SH-SY5Y cells","journal":"Molecular cell / Journal of neural transmission","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and co-localization; single lab validation of Y2H hit","pmids":["15383276","16835690"],"is_preprint":false},{"year":2016,"finding":"GPRASP2, together with Pitchfork (Pifo), forms a Hedgehog-induced ciliary targeting complex that is essential for translocation of the seven-transmembrane receptor Smoothened (Smo) to the primary cilium. Depletion of Gprasp2 prevents Smo ciliary translocation and abolishes Hedgehog target gene activation.","method":"Protein complex identification (co-immunoprecipitation), siRNA/shRNA depletion of Gprasp2 with readout of Smo ciliary localization by immunofluorescence and Hh target gene expression","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined cellular and molecular phenotype (Smo mislocalization, target gene loss); single lab, two orthogonal readouts","pmids":["26901434"],"is_preprint":false},{"year":2019,"finding":"Gprasp2 is involved in postendocytic sorting of G protein-coupled receptors and bidirectionally regulates the surface availability of mGluR5. Gprasp2 deletion in mice leads to enhanced hippocampal mGluR-dependent long-term depression (LTD), increased mGluR5 surface levels, and ASD-like behaviors including altered dendritic complexity, spine density, and synaptic maturation.","method":"Gprasp2 knockout mice (behavioral assays), bidirectional manipulation (overexpression and knockdown) of Gprasp2 with surface biotinylation assay for mGluR5, electrophysiology (hippocampal LTD recording), morphological analysis of dendrites and spines","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (KO behavioral phenotype, surface receptor quantification, electrophysiology, morphology), bidirectional manipulation confirms specificity","pmids":["30926797"],"is_preprint":false},{"year":2021,"finding":"Disruption of Gprasp2 in HEI-OC1 auditory cells via CRISPR/Cas9 down-regulates the Hedgehog signaling pathway, evidenced by decreased expression of Smo, Gli1, and Gli2, and induces mitochondrial damage and apoptosis via altered Bcl2/Bax/Caspase-3 balance. Pharmacological activation of the Hh pathway with the Smoothened agonist Purmorphamine rescues apoptosis in Gprasp2-KO cells, placing GPRASP2 upstream of Smo/Gli signaling in auditory cells.","method":"CRISPR/Cas9 knockout in HEI-OC1 cells, RNA-seq, Western blot (Smo, Gli1, Gli2, Bcl2, Bax, Caspase-3), flow cytometry (apoptosis), transmission electron microscopy (mitochondrial morphology), pharmacological rescue with Smoothened agonist","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with multiple molecular readouts and pharmacological rescue; single lab","pmids":["34418635"],"is_preprint":false},{"year":2024,"finding":"GPRASP2 deficiency in spiral ganglion cells leads to increased phosphorylation of AMPK and activation of the AMPK/DRP1 pathway, resulting in mitochondrial fragmentation (abnormal morphology, decreased membrane potential) and apoptosis. Treatment with the mitochondrial division inhibitor Mdivi-1 mitigates these effects, establishing GPRASP2 as a regulator of mitochondrial dynamics in auditory neurons via the AMPK/DRP1 axis.","method":"Gprasp2-shRNA knockdown via lentiviral infection of primary spiral ganglion cells, Western blot (phospho-AMPK, DRP1), mitochondrial morphology assessment, membrane potential assay, flow cytometry (apoptosis), pharmacological rescue with Mdivi-1, cochlear explant culture","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 2 — shRNA KD with pathway-specific readouts and pharmacological rescue; single lab","pmids":["39253164"],"is_preprint":false},{"year":2024,"finding":"GPRASP2 overexpression in mouse cochlear organoids promotes proliferation of supporting cells via the Hedgehog signaling pathway and promotes hair cell formation from supporting cells via β-catenin signaling. GPRASP2 deficiency results in increased lysosomal degradation of the SMO protein, leading to decreased β-catenin and GLI1 expression, establishing GPRASP2 as a regulator of SMO protein stability at the lysosome.","method":"Gprasp2 overexpression in mouse cochlear organoids, GPRASP2 deficiency model, Western blot (SMO, β-catenin, GLI1), lysosomal degradation assays, AAV-ie-Gprasp2 delivery, smoothened agonist (SAG) rescue in neomycin-treated cochlear explant","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional manipulation with defined molecular pathway readouts; single lab","pmids":["39675768"],"is_preprint":false},{"year":2024,"finding":"Gprasp2 deletion in female mice disrupts social and working memory, impairs maternal care behaviors, and alters expression of oxytocin receptor (OxtR) in the hypothalamus and mammary gland structure. Cross-fostering experiments demonstrate that mutant dam genotype negatively affects pup vocalization development, indicating that Gprasp2-dependent maternal neurological function has a non-cell-autonomous effect on early progeny neurodevelopment.","method":"Gprasp2 knockout mice (female), behavioral paradigms (anxiety, memory, maternal care, social behavior), ultrasonic vocalization recording, cross-fostering experiments, OxtR expression analysis (molecular), mammary gland histology","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — KO with multiple behavioral and molecular phenotypes; cross-fostering provides epistatic evidence; single lab","pmids":["38816497"],"is_preprint":false},{"year":2026,"finding":"GPRASP2 physically binds NCAM1, and GPRASP2 deficiency reduces NCAM1 protein levels and enhances ferritinophagy in cochlear hair cells, linking GPRASP2 to iron homeostasis. Gprasp2-deficient mice display hearing loss, disordered cochlear hair cell arrangement, and depression-like behaviors.","method":"Co-immunoprecipitation (GPRASP2-NCAM1 interaction), Gprasp2-deficient mouse model, Western blot (NCAM1), ferritinophagy assays, auditory brainstem response (hearing phenotype), behavioral assays","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2–3 — Co-IP identifies binding partner; KO mouse with mechanistic follow-up on ferritinophagy pathway; single lab","pmids":["41688572"],"is_preprint":false},{"year":2026,"finding":"GPRASP2, a post-endosomal sorting protein, is highly expressed in quiescent hematopoietic stem cells (HSCs) and mediates elevated endocytosis that attenuates signaling through receptor internalization. Disruption of GPRASP2-mediated endocytosis induces rapid HSC proliferation and increased expression of signaling constituents, demonstrating that GPRASP2 maintains HSC quiescence and self-renewal by limiting receptor-mediated signal transduction through endocytic routing.","method":"GPRASP2 expression profiling in HSC subpopulations, loss-of-function disruption of GPRASP2-mediated endocytosis with readout of HSC proliferation, self-renewal assays, and signaling constituent expression","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — preprint, mechanistic model supported by loss-of-function and expression data; single lab, awaiting peer review","pmids":["41726907"],"is_preprint":true}],"current_model":"GPRASP2 is a post-endosomal sorting protein that regulates the surface availability and lysosomal degradation of G protein-coupled receptors (including mGluR5 and Smoothened), partners with Pitchfork to target Smoothened to the primary cilium for Hedgehog pathway activation, interacts with huntingtin and NCAM1, controls AMPK/DRP1-mediated mitochondrial dynamics in auditory neurons, and maintains hematopoietic stem cell quiescence by elevating endocytosis to attenuate receptor signaling."},"narrative":{"teleology":[{"year":2004,"claim":"Identifying a physical link between GPRASP2 and huntingtin established the first evidence that GPRASP2 participates in neuronal protein networks relevant to receptor trafficking.","evidence":"Yeast two-hybrid screen followed by reciprocal co-immunoprecipitation and co-localization in SH-SY5Y neuronal cells","pmids":["15383276","16835690"],"confidence":"Medium","gaps":["Functional consequence of the huntingtin–GPRASP2 interaction on receptor sorting was not determined","Single-lab Y2H hit without independent replication","No in vivo validation"]},{"year":2016,"claim":"Demonstrating that GPRASP2 and Pitchfork form a Hedgehog-induced complex required for Smoothened ciliary translocation established GPRASP2 as an active participant in Hedgehog signal transduction.","evidence":"Co-immunoprecipitation of GPRASP2–Pifo complex; siRNA/shRNA depletion with immunofluorescence for Smo ciliary localization and Hh target-gene expression","pmids":["26901434"],"confidence":"Medium","gaps":["Direct binding interface between GPRASP2 and Smoothened was not mapped","Single lab; no in vivo confirmation of ciliary targeting requirement","Whether GPRASP2 sorts Smo via the same endosomal mechanism as other GPCRs was not tested"]},{"year":2019,"claim":"Bidirectional manipulation of Gprasp2 in vivo revealed it as a critical determinant of mGluR5 surface levels and synaptic plasticity, linking its post-endosomal sorting function to neurodevelopmental phenotypes.","evidence":"Gprasp2 knockout mice with behavioral testing, surface biotinylation for mGluR5, hippocampal LTD electrophysiology, dendritic morphology analysis; overexpression and knockdown in neurons","pmids":["30926797"],"confidence":"High","gaps":["Whether GPRASP2 sorts mGluR5 to lysosomes versus recycling endosomes was not resolved at the compartment level","Rescue of behavioral phenotypes by mGluR5 modulation was not performed"]},{"year":2021,"claim":"CRISPR knockout in auditory cells confirmed that GPRASP2 operates upstream of Smo/Gli signaling and that its loss triggers mitochondrial damage and apoptosis, extending the Hedgehog-regulatory role to a non-neuronal sensory context.","evidence":"CRISPR/Cas9 KO in HEI-OC1 cells; RNA-seq, Western blot, TEM of mitochondria, Purmorphamine rescue of apoptosis","pmids":["34418635"],"confidence":"Medium","gaps":["Whether mitochondrial damage is a direct consequence of Hh pathway loss or an independent GPRASP2 function was not distinguished","Single immortalized cell line (HEI-OC1)"]},{"year":2024,"claim":"Identification of the AMPK/DRP1 axis downstream of GPRASP2 deficiency in primary spiral ganglion neurons established a specific mitochondrial-dynamics pathway controlled by GPRASP2, with pharmacological rescue confirming causality.","evidence":"Lentiviral shRNA knockdown in primary spiral ganglion cells; phospho-AMPK/DRP1 Western blot, mitochondrial membrane potential assay, Mdivi-1 rescue","pmids":["39253164"],"confidence":"Medium","gaps":["How GPRASP2 suppresses AMPK phosphorylation mechanistically is unknown","Whether AMPK/DRP1 regulation occurs downstream of GPCR sorting or through an independent mechanism was not resolved"]},{"year":2024,"claim":"Bidirectional manipulation in cochlear organoids showed GPRASP2 stabilizes Smoothened by preventing its lysosomal degradation, connecting the sorting function to β-catenin signaling and supporting-cell proliferation/hair-cell regeneration.","evidence":"Gprasp2 overexpression and deficiency in cochlear organoids; lysosomal degradation assays, Western blot for SMO/β-catenin/GLI1, AAV-mediated rescue","pmids":["39675768"],"confidence":"Medium","gaps":["Direct structural or proximity-labeling evidence for GPRASP2–Smoothened interaction at the endosome is lacking","Whether Wnt/β-catenin activation is entirely Smo-dependent or partly independent was not fully dissected"]},{"year":2024,"claim":"Female-specific Gprasp2 knockout studies revealed roles in social memory, maternal behavior, and oxytocin receptor expression, broadening the neurobehavioral impact of GPRASP2 beyond ASD-like phenotypes to sex-specific circuits.","evidence":"Gprasp2 KO female mice; anxiety, memory, and maternal-care behavioral batteries; cross-fostering design; OxtR expression analysis","pmids":["38816497"],"confidence":"Medium","gaps":["Whether OxtR surface levels are directly regulated by GPRASP2-mediated sorting was not tested biochemically","Cross-fostering shows non-cell-autonomous effects but does not identify the signaling mediator"]},{"year":2026,"claim":"Discovery of a GPRASP2–NCAM1 physical interaction linked GPRASP2 to ferritinophagy and iron homeostasis in cochlear hair cells, expanding its sorting substrate repertoire beyond GPCRs.","evidence":"Co-immunoprecipitation of GPRASP2–NCAM1; Gprasp2-deficient mice with ABR hearing assessment, ferritinophagy assays, behavioral tests","pmids":["41688572"],"confidence":"Medium","gaps":["Reciprocal validation of NCAM1 interaction awaits confirmation by an independent method (e.g., proximity labeling)","Mechanism by which GPRASP2 controls ferritinophagy is undefined","Single lab"]},{"year":null,"claim":"Whether GPRASP2's post-endosomal sorting function operates through a unified endosomal machinery for all its cargo (mGluR5, Smoothened, NCAM1, OxtR) or through cargo-specific adaptors remains an open question, as does the structural basis for substrate recognition.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of GPRASP2 or its cargo-binding domains exists","Substrate selectivity rules are unknown","Relationship between GPCR-sorting and mitochondrial-dynamics functions has not been mechanistically linked"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,5,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,5,8]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,3,5,6]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,5,8]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,6]}],"complexes":["Pitchfork–GPRASP2 ciliary targeting complex"],"partners":["PIFO","SMO","HTT","NCAM1","GRM5"],"other_free_text":[]},"mechanistic_narrative":"GPRASP2 is a post-endosomal sorting protein that controls the surface availability and lysosomal fate of G protein-coupled receptors and other transmembrane proteins, thereby tuning diverse signaling pathways. It bidirectionally regulates mGluR5 surface levels in hippocampal neurons, and its deletion enhances mGluR-dependent long-term depression and produces autism-spectrum-like behaviors in mice [PMID:30926797]. GPRASP2 also partners with Pitchfork to form a Hedgehog-induced complex that targets Smoothened to the primary cilium; loss of GPRASP2 blocks Smoothened ciliary translocation and Hedgehog target-gene activation, and promotes lysosomal degradation of Smoothened with downstream consequences for β-catenin and GLI1 signaling [PMID:26901434, PMID:39675768]. In auditory neurons, GPRASP2 deficiency activates the AMPK/DRP1 axis, driving mitochondrial fragmentation and apoptosis, and in the cochlea GPRASP2 binds NCAM1 to regulate ferritinophagy and hair-cell iron homeostasis [PMID:39253164, PMID:41688572]."},"prefetch_data":{"uniprot":{"accession":"Q96D09","full_name":"G-protein coupled receptor-associated sorting protein 2","aliases":[],"length_aa":838,"mass_kda":93.8,"function":"May play a role in regulation of a variety of G-protein coupled receptors","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q96D09/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GPRASP2"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"TCF25","stoichiometry":10.0},{"gene":"RBM14","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/GPRASP2","total_profiled":1310},"omim":[{"mim_id":"613004","title":"HUNTINGTIN; HTT","url":"https://www.omim.org/entry/613004"},{"mim_id":"301018","title":"DEAFNESS, X-LINKED 7; DFNX7","url":"https://www.omim.org/entry/301018"},{"mim_id":"300969","title":"G PROTEIN-COUPLED RECEPTOR-ASSOCIATED SORTING PROTEIN 2; GPRASP2","url":"https://www.omim.org/entry/300969"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/GPRASP2"},"hgnc":{"alias_symbol":["GASP2","FLJ37327"],"prev_symbol":[]},"alphafold":{"accession":"Q96D09","domains":[{"cath_id":"-","chopping":"558-577_585-667","consensus_level":"medium","plddt":78.2593,"start":558,"end":667},{"cath_id":"1.25.10.10","chopping":"675-831","consensus_level":"medium","plddt":86.3103,"start":675,"end":831}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96D09","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96D09-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96D09-F1-predicted_aligned_error_v6.png","plddt_mean":49.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GPRASP2","jax_strain_url":"https://www.jax.org/strain/search?query=GPRASP2"},"sequence":{"accession":"Q96D09","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96D09.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96D09/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96D09"}},"corpus_meta":[{"pmid":"24019467","id":"PMC_24019467","title":"Regulation 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\"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KO mice, bidirectional manipulation, electrophysiology, imaging) with defined cellular and molecular phenotypes in a single study\",\n      \"pmids\": [\"30926797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GPRASP2 (Gprasp2) forms a complex with Pitchfork (Pifo) to constitute a Hedgehog-induced ciliary targeting complex that regulates translocation of Smoothened (Smo) to the primary cilium; depletion of Gprasp2 prevents Smo ciliary translocation and abolishes Hedgehog target gene activation.\",\n      \"method\": \"siRNA depletion, co-immunoprecipitation, immunofluorescence imaging of primary cilia, reporter assays for Hh target genes\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, loss-of-function with specific molecular phenotype (Smo mislocalization and Hh gene silencing), replicated across cell lines\",\n      \"pmids\": [\"26901434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GPRASP2 (GASP2) physically interacts with huntingtin (htt) and the two proteins co-localize in SH-SY5Y neuronal cells, suggesting that htt may influence G-protein-coupled receptor trafficking via GASP2.\",\n      \"method\": \"Yeast two-hybrid, membrane-based co-immunoprecipitation, classical co-immunoprecipitation in co-transfected mammalian cells, co-localization by immunofluorescence\",\n      \"journal\": \"Journal of Neural Transmission\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP validated by two independent assay formats plus co-localization, but functional consequence of the interaction not directly demonstrated\",\n      \"pmids\": [\"16835690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Gprasp2 knockout in HEI-OC1 auditory cells down-regulates the Hedgehog signaling pathway (reduced Smo, Gli1, Gli2), induces mitochondrial damage, and triggers apoptosis via differential expression of Bcl2/Bax/Caspase-3; treatment with the Smo agonist Purmorphamine rescues Hh signaling and reduces apoptosis.\",\n      \"method\": \"CRISPR/Cas9 KO, RNA-seq, Western blot, flow cytometry, confocal and electron microscopy, pharmacological rescue with SMO agonist\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods and pharmacological rescue in a single study, but single lab\",\n      \"pmids\": [\"34418635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GPRASP2 deficiency increases lysosomal degradation of SMO protein, thereby decreasing β-catenin levels and expression of the Hedgehog transcription factor GLI1; in cochlear organoids, Gprasp2 overexpression promotes supporting cell proliferation via the Hedgehog pathway and hair cell formation via β-catenin signaling.\",\n      \"method\": \"Mouse cochlear organoids, AAV-mediated Gprasp2 overexpression, CRISPR/Cas9 KO, Western blot for SMO/β-catenin/GLI1, SAG pharmacological rescue\",\n      \"journal\": \"Cell Proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic rescue with SMO agonist supports the pathway placement, but single lab with limited orthogonal validation\",\n      \"pmids\": [\"39675768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GPRASP2 deficiency in spiral ganglion cells activates the AMPK/DRP1 signaling pathway, causing abnormal mitochondrial morphology, decreased mitochondrial membrane potential, and apoptosis; these effects are mitigated by the mitochondrial fission inhibitor Mdivi-1.\",\n      \"method\": \"Lentiviral shRNA knockdown in primary spiral ganglion cells, Western blot for p-AMPK/DRP1, mitochondrial membrane potential assay, Mdivi-1 pharmacological rescue, cochlear explant culture\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — shRNA KD with pharmacological rescue supporting pathway placement, single lab\",\n      \"pmids\": [\"39253164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GPRASP2 physically binds NCAM1; GPRASP2 deficiency reduces NCAM1 protein levels and enhances ferritinophagy in cochlear hair cells, contributing to disordered hair cell arrangement and hearing loss.\",\n      \"method\": \"Co-immunoprecipitation (GPRASP2–NCAM1 interaction), Gprasp2-deficient mouse model, Western blot, ferritinophagy assay\",\n      \"journal\": \"Communications Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — co-IP identifying a novel binding partner plus in vivo KO phenotype, single lab, limited functional dissection of the interaction\",\n      \"pmids\": [\"41688572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GPRASP2 mediates elevated endocytic/post-endosomal sorting in hematopoietic stem cells (HSCs); GPRASP2-high HSCs are functionally dormant but molecularly primed, and disruption of GPRASP2-mediated endocytosis induces rapid HSC proliferation and elevated signaling, consistent with a model where elevated endocytosis attenuates signaling through receptor internalization.\",\n      \"method\": \"GPRASP2 protein enrichment in quiescent HSCs, genetic disruption (KO), flow cytometry for HSC quiescence markers, functional HSC assays, signaling constituent profiling\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype and pathway placement, but preprint not yet peer-reviewed\",\n      \"pmids\": [\"41726907\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Gprasp2 deletion in female mice disrupts social and working memory, impairs maternal care behaviors, and alters oxytocin receptor (OxtR) expression in the hypothalamus; cross-fostering experiments demonstrate that mutant dam behavior contributes to impaired early pup vocalization development.\",\n      \"method\": \"Gprasp2 KO mouse behavioral paradigms, cross-fostering, ultrasonic vocalization recording, RT-qPCR/Western blot for OxtR\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined behavioral and molecular phenotypes and cross-fostering epistasis, single lab\",\n      \"pmids\": [\"38816497\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GPRASP2 is a post-endosomal sorting protein that regulates the intracellular trafficking and lysosomal degradation of G-protein-coupled receptors (including mGluR5 and Smoothened), thereby controlling surface receptor availability, Hedgehog and mGluR-dependent synaptic signaling, and cellular processes ranging from synaptic plasticity and hematopoietic stem cell quiescence to auditory hair cell survival; it also physically interacts with huntingtin and NCAM1, and its loss triggers downstream AMPK/DRP1-mediated mitochondrial dysfunction and apoptosis.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper first, then extract discoveries from KEPT papers only.\n\n**Classification:**\n\nRETRIEVED PAPERS:\n1. [PMID:24019467] - GASP-2 (GDF-associated serum protein-2) regulating myostatin/GDF-11 — This is about GASP-1/GASP-2 proteins that inhibit TGF-β ligands. GASP-2 here refers to the secreted myostatin inhibitor (encoded by WFIKKN1/WFIKKN2 family), NOT GPRASP2 (G protein-coupled receptor-associated sorting protein 2, encoded by GPRASP2/ARMC10 on X chromosome). ALIAS COLLISION → EXCLUDE\n2. [PMID:30926797] - Gprasp2 mutant mice, mGluR, ASD → KEEP\n3. [PMID:26901434] - Gprasp2 and Pitchfork targeting Smoothened to primary cilia → KEEP\n4. [PMID:16835690] - Huntingtin interacts with GASP2 — explicitly states GASP2 = G protein-coupled receptor associated sorting protein 2, involved in membrane receptor degradation → KEEP\n5. [PMID:28955860] - GASP-2 overexpression in C2C12, myostatin inhibitor — same alias collision as paper 1 → EXCLUDE\n6. [PMID:28096187] - GPRASP2 mutation in X-linked hearing loss → KEEP (expression/genetics, but has in silico functional analysis — marginal; keep for context)\n7. [PMID:31960486] - GASP-2 overexpressing mice, muscle phenotype, myostatin — same alias collision → EXCLUDE\n8. [PMID:34418635] - Gprasp2 KO in auditory cells, Hedgehog signaling → KEEP\n9. [PMID:39675768] - GPRASP2 in cochlear supporting cells, Hedgehog/β-catenin → KEEP\n10. [PMID:28849214] - armc10 zebrafish ortholog expression — expression study only → EXCLUDE (no mechanistic finding)\n11. [PMID:38816497] - Gprasp2 deletion in females, maternal behavior → KEEP (behavioral/molecular phenotype)\n12. [PMID:39253164] - GPRASP2 deficiency, spiral ganglion cells, AMPK/DRP1 → KEEP\n13. [PMID:41688572] - GPRASP2 binds NCAM1, ferritinophagy in hair cells → KEEP\n14. [PMID:41726907] - GPRASP2 in HSC endocytic trafficking → KEEP\n15. [bio_10.1101_2024.07.18.24310640] - XWAS in ASD, GPRASP2 mentioned as associated gene — association study → EXCLUDE\n\nADDITIONAL PAPERS:\n- Most are large-scale interactome/genomics resource papers. PMID:20479760 (Piton et al.) identifies rare variants in GPRASP2 in ASD/SCZ patients — genetic association, no mechanism → EXCLUDE\n- PMID:15383276 (Goehler et al.) — HD interaction network, GASP2 mentioned as htt interactor → this is the same GASP2/GPRASP2 protein; foundational Y2H + Co-IP study → KEEP\n- PMID:17043677 (Camargo et al.) — DISC1 interactome; may mention GPRASP2 but not as primary subject → marginal, check: abstract doesn't specifically mention GPRASP2 → EXCLUDE\n- Others are general resource papers (genome sequencing, cDNA collections, interactome maps) that don't specifically describe GPRASP2 mechanism → EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"GPRASP2 (GASP2) was identified as a direct interaction partner of huntingtin (htt) via yeast two-hybrid screening, and this interaction was validated by membrane-based and classical co-immunoprecipitation assays in co-transfected mammalian cells. The two proteins co-localize in SH-SY5Y neuronal cells, suggesting that huntingtin may influence G protein-coupled receptor trafficking via its interaction with GASP2.\",\n      \"method\": \"Yeast two-hybrid screening, membrane-based co-immunoprecipitation, classical co-immunoprecipitation, immunofluorescence co-localization in SH-SY5Y cells\",\n      \"journal\": \"Molecular cell / Journal of neural transmission\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and co-localization; single lab validation of Y2H hit\",\n      \"pmids\": [\"15383276\", \"16835690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GPRASP2, together with Pitchfork (Pifo), forms a Hedgehog-induced ciliary targeting complex that is essential for translocation of the seven-transmembrane receptor Smoothened (Smo) to the primary cilium. Depletion of Gprasp2 prevents Smo ciliary translocation and abolishes Hedgehog target gene activation.\",\n      \"method\": \"Protein complex identification (co-immunoprecipitation), siRNA/shRNA depletion of Gprasp2 with readout of Smo ciliary localization by immunofluorescence and Hh target gene expression\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined cellular and molecular phenotype (Smo mislocalization, target gene loss); single lab, two orthogonal readouts\",\n      \"pmids\": [\"26901434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Gprasp2 is involved in postendocytic sorting of G protein-coupled receptors and bidirectionally regulates the surface availability of mGluR5. Gprasp2 deletion in mice leads to enhanced hippocampal mGluR-dependent long-term depression (LTD), increased mGluR5 surface levels, and ASD-like behaviors including altered dendritic complexity, spine density, and synaptic maturation.\",\n      \"method\": \"Gprasp2 knockout mice (behavioral assays), bidirectional manipulation (overexpression and knockdown) of Gprasp2 with surface biotinylation assay for mGluR5, electrophysiology (hippocampal LTD recording), morphological analysis of dendrites and spines\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (KO behavioral phenotype, surface receptor quantification, electrophysiology, morphology), bidirectional manipulation confirms specificity\",\n      \"pmids\": [\"30926797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Disruption of Gprasp2 in HEI-OC1 auditory cells via CRISPR/Cas9 down-regulates the Hedgehog signaling pathway, evidenced by decreased expression of Smo, Gli1, and Gli2, and induces mitochondrial damage and apoptosis via altered Bcl2/Bax/Caspase-3 balance. Pharmacological activation of the Hh pathway with the Smoothened agonist Purmorphamine rescues apoptosis in Gprasp2-KO cells, placing GPRASP2 upstream of Smo/Gli signaling in auditory cells.\",\n      \"method\": \"CRISPR/Cas9 knockout in HEI-OC1 cells, RNA-seq, Western blot (Smo, Gli1, Gli2, Bcl2, Bax, Caspase-3), flow cytometry (apoptosis), transmission electron microscopy (mitochondrial morphology), pharmacological rescue with Smoothened agonist\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with multiple molecular readouts and pharmacological rescue; single lab\",\n      \"pmids\": [\"34418635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GPRASP2 deficiency in spiral ganglion cells leads to increased phosphorylation of AMPK and activation of the AMPK/DRP1 pathway, resulting in mitochondrial fragmentation (abnormal morphology, decreased membrane potential) and apoptosis. Treatment with the mitochondrial division inhibitor Mdivi-1 mitigates these effects, establishing GPRASP2 as a regulator of mitochondrial dynamics in auditory neurons via the AMPK/DRP1 axis.\",\n      \"method\": \"Gprasp2-shRNA knockdown via lentiviral infection of primary spiral ganglion cells, Western blot (phospho-AMPK, DRP1), mitochondrial morphology assessment, membrane potential assay, flow cytometry (apoptosis), pharmacological rescue with Mdivi-1, cochlear explant culture\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — shRNA KD with pathway-specific readouts and pharmacological rescue; single lab\",\n      \"pmids\": [\"39253164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GPRASP2 overexpression in mouse cochlear organoids promotes proliferation of supporting cells via the Hedgehog signaling pathway and promotes hair cell formation from supporting cells via β-catenin signaling. GPRASP2 deficiency results in increased lysosomal degradation of the SMO protein, leading to decreased β-catenin and GLI1 expression, establishing GPRASP2 as a regulator of SMO protein stability at the lysosome.\",\n      \"method\": \"Gprasp2 overexpression in mouse cochlear organoids, GPRASP2 deficiency model, Western blot (SMO, β-catenin, GLI1), lysosomal degradation assays, AAV-ie-Gprasp2 delivery, smoothened agonist (SAG) rescue in neomycin-treated cochlear explant\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation with defined molecular pathway readouts; single lab\",\n      \"pmids\": [\"39675768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Gprasp2 deletion in female mice disrupts social and working memory, impairs maternal care behaviors, and alters expression of oxytocin receptor (OxtR) in the hypothalamus and mammary gland structure. Cross-fostering experiments demonstrate that mutant dam genotype negatively affects pup vocalization development, indicating that Gprasp2-dependent maternal neurological function has a non-cell-autonomous effect on early progeny neurodevelopment.\",\n      \"method\": \"Gprasp2 knockout mice (female), behavioral paradigms (anxiety, memory, maternal care, social behavior), ultrasonic vocalization recording, cross-fostering experiments, OxtR expression analysis (molecular), mammary gland histology\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with multiple behavioral and molecular phenotypes; cross-fostering provides epistatic evidence; single lab\",\n      \"pmids\": [\"38816497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GPRASP2 physically binds NCAM1, and GPRASP2 deficiency reduces NCAM1 protein levels and enhances ferritinophagy in cochlear hair cells, linking GPRASP2 to iron homeostasis. Gprasp2-deficient mice display hearing loss, disordered cochlear hair cell arrangement, and depression-like behaviors.\",\n      \"method\": \"Co-immunoprecipitation (GPRASP2-NCAM1 interaction), Gprasp2-deficient mouse model, Western blot (NCAM1), ferritinophagy assays, auditory brainstem response (hearing phenotype), behavioral assays\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — Co-IP identifies binding partner; KO mouse with mechanistic follow-up on ferritinophagy pathway; single lab\",\n      \"pmids\": [\"41688572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GPRASP2, a post-endosomal sorting protein, is highly expressed in quiescent hematopoietic stem cells (HSCs) and mediates elevated endocytosis that attenuates signaling through receptor internalization. Disruption of GPRASP2-mediated endocytosis induces rapid HSC proliferation and increased expression of signaling constituents, demonstrating that GPRASP2 maintains HSC quiescence and self-renewal by limiting receptor-mediated signal transduction through endocytic routing.\",\n      \"method\": \"GPRASP2 expression profiling in HSC subpopulations, loss-of-function disruption of GPRASP2-mediated endocytosis with readout of HSC proliferation, self-renewal assays, and signaling constituent expression\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — preprint, mechanistic model supported by loss-of-function and expression data; single lab, awaiting peer review\",\n      \"pmids\": [\"41726907\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"GPRASP2 is a post-endosomal sorting protein that regulates the surface availability and lysosomal degradation of G protein-coupled receptors (including mGluR5 and Smoothened), partners with Pitchfork to target Smoothened to the primary cilium for Hedgehog pathway activation, interacts with huntingtin and NCAM1, controls AMPK/DRP1-mediated mitochondrial dynamics in auditory neurons, and maintains hematopoietic stem cell quiescence by elevating endocytosis to attenuate receptor signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GPRASP2 is a post-endocytic sorting protein that controls the surface availability and lysosomal fate of G-protein-coupled receptors, thereby tuning receptor-dependent signaling in contexts ranging from synaptic plasticity to stem-cell quiescence. Bidirectional manipulation of GPRASP2 levels bidirectionally modulates surface mGluR5 in hippocampal neurons, and its loss enhances mGluR-dependent long-term depression while altering dendritic complexity and spine density [PMID:30926797]. GPRASP2 also forms a ciliary targeting complex with Pitchfork to promote Smoothened translocation to the primary cilium; its deficiency prevents Smoothened ciliary localization, accelerates Smoothened lysosomal degradation, silences Hedgehog target genes, and triggers AMPK/DRP1-mediated mitochondrial dysfunction and apoptosis in auditory cells [PMID:26901434, PMID:34418635, PMID:39675768, PMID:39253164]. In vivo, Gprasp2 deletion disrupts oxytocin receptor expression and maternal behavior, impairs cochlear hair cell survival through enhanced ferritinophagy linked to reduced NCAM1 levels, and induces rapid proliferation of normally quiescent hematopoietic stem cells, consistent with a general role in attenuating signaling through receptor internalization [PMID:38816497, PMID:41688572].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing that GPRASP2 physically interacts with huntingtin placed GPRASP2 in a neuronal receptor-trafficking network relevant to Huntington's disease pathology, though the functional consequence remained undefined.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP in multiple formats, and co-localization in SH-SY5Y cells\",\n      \"pmids\": [\"16835690\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional consequence of the huntingtin–GPRASP2 interaction not demonstrated\",\n        \"No assessment of whether polyQ-expanded huntingtin alters the interaction\",\n        \"Endogenous co-IP not shown\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating that GPRASP2 and Pitchfork form a Hedgehog-induced complex required for Smoothened ciliary translocation established GPRASP2 as a trafficking factor in Hedgehog signal transduction, moving beyond a generic GPCR-sorting role.\",\n      \"evidence\": \"Reciprocal co-IP, siRNA depletion blocking Smo ciliary localization, and Hh reporter assays across cell lines\",\n      \"pmids\": [\"26901434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of the GPRASP2–Pitchfork–Smo complex unknown\",\n        \"In vivo relevance in mammalian Hh-dependent tissues not tested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Bidirectional manipulation of Gprasp2 in neurons showed it controls mGluR5 surface levels and mGluR-dependent synaptic plasticity, establishing GPRASP2 as a physiologically relevant post-endocytic sorting factor that shapes synaptic function.\",\n      \"evidence\": \"Gprasp2 KO mice, shRNA/overexpression in neurons, surface receptor assays, LTD electrophysiology, dendritic morphology imaging\",\n      \"pmids\": [\"30926797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which GPRASP2 directs mGluR5 to lysosomes versus recycling is unclear\",\n        \"Whether the effect generalizes to other family-C GPCRs not tested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"CRISPR knockout of Gprasp2 in auditory cells revealed that the Hedgehog pathway link has downstream consequences for mitochondrial integrity and apoptosis, broadening GPRASP2 function beyond trafficking to cell survival.\",\n      \"evidence\": \"CRISPR KO in HEI-OC1 cells, RNA-seq, Western blot for Bcl2/Bax/Caspase-3, Purmorphamine rescue\",\n      \"pmids\": [\"34418635\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single cell line; in vivo cochlear phenotype not yet confirmed at this stage\",\n        \"Whether mitochondrial damage is a direct or indirect consequence of Smo loss is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Three independent studies in 2024 extended GPRASP2's functional repertoire: (i) its deficiency increases lysosomal degradation of Smoothened and reduces β-catenin/GLI1 in cochlear organoids, (ii) GPRASP2 loss in spiral ganglion cells activates AMPK/DRP1-mediated mitochondrial fission and apoptosis, and (iii) Gprasp2 KO in female mice disrupts oxytocin receptor expression and maternal behavior, collectively demonstrating tissue-wide dependence on GPRASP2-mediated receptor homeostasis.\",\n      \"evidence\": \"Mouse cochlear organoids with AAV overexpression and CRISPR KO; shRNA knockdown with Mdivi-1 rescue in spiral ganglion cells; KO mouse behavioral paradigms with cross-fostering and OxtR quantification\",\n      \"pmids\": [\"39675768\", \"39253164\", \"38816497\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct mechanism linking GPRASP2 to oxytocin receptor trafficking (versus transcriptional regulation) not dissected\",\n        \"Whether AMPK/DRP1 activation is specific to auditory neurons or a general consequence of Hh pathway collapse unknown\",\n        \"β-catenin involvement downstream of Smo needs confirmation outside cochlear models\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identification of NCAM1 as a direct GPRASP2-binding partner linked GPRASP2 deficiency to enhanced ferritinophagy and hair cell disorganization, while enrichment of GPRASP2 in quiescent HSCs showed that its endocytic sorting function enforces stem cell dormancy by attenuating surface receptor signaling.\",\n      \"evidence\": \"Co-IP for GPRASP2–NCAM1, Gprasp2-deficient mouse cochlea, ferritinophagy assays; GPRASP2 protein enrichment in quiescent HSCs, KO with flow cytometry and functional HSC assays (preprint)\",\n      \"pmids\": [\"41688572\", \"41726907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"HSC findings from preprint, not yet peer-reviewed\",\n        \"Whether NCAM1 is a direct trafficking cargo of GPRASP2 or an indirect interactor not established\",\n        \"Mechanism connecting ferritinophagy to GPRASP2/NCAM1 axis unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of GPRASP2's cargo selectivity among GPCRs and non-GPCR partners, and how its sorting decisions are regulated by post-translational modifications or adaptor complexes, remain unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of GPRASP2 or its complexes\",\n        \"No systematic profiling of GPRASP2 cargo specificity across the GPCR superfamily\",\n        \"Post-translational regulation of GPRASP2 activity entirely unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 3, 4, 8]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [\n      \"Pitchfork–GPRASP2 ciliary targeting complex\"\n    ],\n    \"partners\": [\n      \"PIFO\",\n      \"SMO\",\n      \"HTT\",\n      \"GRM5\",\n      \"NCAM1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"GPRASP2 is a post-endosomal sorting protein that controls the surface availability and lysosomal fate of G protein-coupled receptors and other transmembrane proteins, thereby tuning diverse signaling pathways. It bidirectionally regulates mGluR5 surface levels in hippocampal neurons, and its deletion enhances mGluR-dependent long-term depression and produces autism-spectrum-like behaviors in mice [PMID:30926797]. GPRASP2 also partners with Pitchfork to form a Hedgehog-induced complex that targets Smoothened to the primary cilium; loss of GPRASP2 blocks Smoothened ciliary translocation and Hedgehog target-gene activation, and promotes lysosomal degradation of Smoothened with downstream consequences for β-catenin and GLI1 signaling [PMID:26901434, PMID:39675768]. In auditory neurons, GPRASP2 deficiency activates the AMPK/DRP1 axis, driving mitochondrial fragmentation and apoptosis, and in the cochlea GPRASP2 binds NCAM1 to regulate ferritinophagy and hair-cell iron homeostasis [PMID:39253164, PMID:41688572].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying a physical link between GPRASP2 and huntingtin established the first evidence that GPRASP2 participates in neuronal protein networks relevant to receptor trafficking.\",\n      \"evidence\": \"Yeast two-hybrid screen followed by reciprocal co-immunoprecipitation and co-localization in SH-SY5Y neuronal cells\",\n      \"pmids\": [\"15383276\", \"16835690\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional consequence of the huntingtin–GPRASP2 interaction on receptor sorting was not determined\",\n        \"Single-lab Y2H hit without independent replication\",\n        \"No in vivo validation\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating that GPRASP2 and Pitchfork form a Hedgehog-induced complex required for Smoothened ciliary translocation established GPRASP2 as an active participant in Hedgehog signal transduction.\",\n      \"evidence\": \"Co-immunoprecipitation of GPRASP2–Pifo complex; siRNA/shRNA depletion with immunofluorescence for Smo ciliary localization and Hh target-gene expression\",\n      \"pmids\": [\"26901434\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding interface between GPRASP2 and Smoothened was not mapped\",\n        \"Single lab; no in vivo confirmation of ciliary targeting requirement\",\n        \"Whether GPRASP2 sorts Smo via the same endosomal mechanism as other GPCRs was not tested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Bidirectional manipulation of Gprasp2 in vivo revealed it as a critical determinant of mGluR5 surface levels and synaptic plasticity, linking its post-endosomal sorting function to neurodevelopmental phenotypes.\",\n      \"evidence\": \"Gprasp2 knockout mice with behavioral testing, surface biotinylation for mGluR5, hippocampal LTD electrophysiology, dendritic morphology analysis; overexpression and knockdown in neurons\",\n      \"pmids\": [\"30926797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether GPRASP2 sorts mGluR5 to lysosomes versus recycling endosomes was not resolved at the compartment level\",\n        \"Rescue of behavioral phenotypes by mGluR5 modulation was not performed\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"CRISPR knockout in auditory cells confirmed that GPRASP2 operates upstream of Smo/Gli signaling and that its loss triggers mitochondrial damage and apoptosis, extending the Hedgehog-regulatory role to a non-neuronal sensory context.\",\n      \"evidence\": \"CRISPR/Cas9 KO in HEI-OC1 cells; RNA-seq, Western blot, TEM of mitochondria, Purmorphamine rescue of apoptosis\",\n      \"pmids\": [\"34418635\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether mitochondrial damage is a direct consequence of Hh pathway loss or an independent GPRASP2 function was not distinguished\",\n        \"Single immortalized cell line (HEI-OC1)\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of the AMPK/DRP1 axis downstream of GPRASP2 deficiency in primary spiral ganglion neurons established a specific mitochondrial-dynamics pathway controlled by GPRASP2, with pharmacological rescue confirming causality.\",\n      \"evidence\": \"Lentiviral shRNA knockdown in primary spiral ganglion cells; phospho-AMPK/DRP1 Western blot, mitochondrial membrane potential assay, Mdivi-1 rescue\",\n      \"pmids\": [\"39253164\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How GPRASP2 suppresses AMPK phosphorylation mechanistically is unknown\",\n        \"Whether AMPK/DRP1 regulation occurs downstream of GPCR sorting or through an independent mechanism was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Bidirectional manipulation in cochlear organoids showed GPRASP2 stabilizes Smoothened by preventing its lysosomal degradation, connecting the sorting function to β-catenin signaling and supporting-cell proliferation/hair-cell regeneration.\",\n      \"evidence\": \"Gprasp2 overexpression and deficiency in cochlear organoids; lysosomal degradation assays, Western blot for SMO/β-catenin/GLI1, AAV-mediated rescue\",\n      \"pmids\": [\"39675768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct structural or proximity-labeling evidence for GPRASP2–Smoothened interaction at the endosome is lacking\",\n        \"Whether Wnt/β-catenin activation is entirely Smo-dependent or partly independent was not fully dissected\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Female-specific Gprasp2 knockout studies revealed roles in social memory, maternal behavior, and oxytocin receptor expression, broadening the neurobehavioral impact of GPRASP2 beyond ASD-like phenotypes to sex-specific circuits.\",\n      \"evidence\": \"Gprasp2 KO female mice; anxiety, memory, and maternal-care behavioral batteries; cross-fostering design; OxtR expression analysis\",\n      \"pmids\": [\"38816497\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether OxtR surface levels are directly regulated by GPRASP2-mediated sorting was not tested biochemically\",\n        \"Cross-fostering shows non-cell-autonomous effects but does not identify the signaling mediator\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Discovery of a GPRASP2–NCAM1 physical interaction linked GPRASP2 to ferritinophagy and iron homeostasis in cochlear hair cells, expanding its sorting substrate repertoire beyond GPCRs.\",\n      \"evidence\": \"Co-immunoprecipitation of GPRASP2–NCAM1; Gprasp2-deficient mice with ABR hearing assessment, ferritinophagy assays, behavioral tests\",\n      \"pmids\": [\"41688572\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Reciprocal validation of NCAM1 interaction awaits confirmation by an independent method (e.g., proximity labeling)\",\n        \"Mechanism by which GPRASP2 controls ferritinophagy is undefined\",\n        \"Single lab\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether GPRASP2's post-endosomal sorting function operates through a unified endosomal machinery for all its cargo (mGluR5, Smoothened, NCAM1, OxtR) or through cargo-specific adaptors remains an open question, as does the structural basis for substrate recognition.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of GPRASP2 or its cargo-binding domains exists\",\n        \"Substrate selectivity rules are unknown\",\n        \"Relationship between GPCR-sorting and mitochondrial-dynamics functions has not been mechanistically linked\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 5, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 5, 8]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 3, 5, 6]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 5, 8]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"complexes\": [\n      \"Pitchfork–GPRASP2 ciliary targeting complex\"\n    ],\n    \"partners\": [\n      \"PIFO\",\n      \"SMO\",\n      \"HTT\",\n      \"NCAM1\",\n      \"GRM5\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}