{"gene":"PACSIN3","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2000,"finding":"PACSIN3 was cloned and found to differ from PACSIN1/2 by having a short proline-rich region and lacking NPF motifs; it is mainly expressed in lung and muscle tissues. All three PACSIN isoforms bind dynamin, synaptojanin 1, and N-WASP via their SH3 domains, co-localize with dynamin (but not clathrin), and overexpression inhibits transferrin endocytosis in a dose-dependent, SH3-domain-dependent manner.","method":"cDNA cloning, GST pull-down, co-immunoprecipitation, co-localization microscopy, transferrin endocytosis assay, SH3-domain mutagenesis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding assays + mutagenesis + functional endocytosis readout in single foundational paper","pmids":["11082044"],"is_preprint":false},{"year":2003,"finding":"PACSIN3 SH3 domain specifically binds a proline-rich sequence of the Sos protein, linking PACSIN3 to actin remodeling/endocytic signaling downstream of Sos.","method":"Synthetic peptide affinity pull-down with SILAC-based quantitative mass spectrometry, confirmed by immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — SILAC peptide pull-down plus IP confirmation, single study","pmids":["14679214"],"is_preprint":false},{"year":2003,"finding":"PACSIN3 binds the cytoplasmic domain of ADAM12/meltrin alpha via a proline-rich region (residues 829–840) of ADAM12; overexpression of PACSIN3 enhances TPA-induced proHB-EGF ectodomain shedding, while siRNA knockdown of PACSIN3 significantly attenuates shedding induced by TPA and angiotensin II, establishing PACSIN3 as an up-regulator of ADAM12-mediated proHB-EGF shedding and EGFR transactivation.","method":"Yeast two-hybrid screen, GST pull-down, co-immunoprecipitation, co-localization, siRNA knockdown, proHB-EGF shedding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Y2H, GST pull-down, Co-IP, siRNA + functional assay) in single study","pmids":["12952982"],"is_preprint":false},{"year":2004,"finding":"PACSIN/Syndapin proteins, including PACSIN3, link membrane trafficking with the cytoskeleton through SH3-domain-mediated interactions with dynamin (vesicle fission) and N-WASP (Arp2/3-dependent actin polymerization), and can oligomerize to couple actin polymerization bursts with vesicle fission.","method":"Review/synthesis of biochemical interaction data (pull-down, Co-IP, domain mapping) from multiple studies","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 — review synthesizing multiple experimental studies; mechanistic model well-supported","pmids":["15226389"],"is_preprint":false},{"year":2006,"finding":"All three PACSIN isoforms bind the N-terminus of TRPV4 via their SH3 domains; PACSIN3 specifically shifts TRPV4 localization toward the plasma membrane (away from cytosol), an effect mimicked by blocking dynamin-mediated endocytosis, indicating PACSIN3 modulates TRPV4 subcellular distribution by inhibiting its endocytosis. Interaction requires both the proline-rich domain of TRPV4 upstream of its ankyrin repeats and the C-terminal SH3 domain of PACSIN3. PACSIN1/2 do not affect TRPV4 localization despite binding.","method":"Yeast two-hybrid screen, biochemical co-immunoprecipitation, co-expression/localization assays, dynamin inhibition, domain mutational analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding assays, mutagenesis, localization with functional consequence, replicated across isoforms","pmids":["16627472"],"is_preprint":false},{"year":2007,"finding":"PACSIN3 is the only PACSIN isoform upregulated during 3T3-L1 adipocyte differentiation; overexpression of PACSIN3 increases glucose uptake by elevating plasma membrane localization of GLUT1 (but not GLUT4), as shown by subcellular fractionation and photoaffinity labeling, establishing a role for PACSIN3 in GLUT1 vesicle trafficking.","method":"Adipocyte differentiation assay, overexpression, subcellular fractionation, photoaffinity labeling of GLUT1/GLUT4, glucose uptake assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment with functional readout, single lab, two orthogonal methods","pmids":["17320047"],"is_preprint":false},{"year":2007,"finding":"PACSIN3 is identified as an interacting partner of FasL in Schwann cells via a proteomics approach, consistent with its role in endocytosis and trafficking of FasL to regulate its cell surface expression.","method":"Proteomic pull-down / affinity purification from Schwann cell lysates","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 — single proteomics identification, no functional follow-up for PACSIN3 specifically","pmids":["17761170"],"is_preprint":false},{"year":2009,"finding":"Zebrafish Pacsin3 (Syndapin ortholog) is required for notochord formation: pacsin3 morphants fail to polarize, migrate, and differentiate axial mesodermal cells, causing stunted body axis. The phenotype is rescued by Drosophila Syndapin expression and depends critically on the membrane-inserting prong of the EFC/F-BAR domain and high-affinity phosphoinositide binding by the antiparallel EFC dimer, linking directional cell migration and endocytosis during embryonic morphogenesis.","method":"Morpholino knockdown (zebrafish), rescue by ectopic Drosophila Syndapin expression, crystal structure of Drosophila EFC domain, domain mutagenesis, biochemical phosphoinositide binding assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 — structure + mutagenesis + in vivo rescue in single study with multiple orthogonal methods","pmids":["19997509"],"is_preprint":false},{"year":2013,"finding":"PACSIN3 (co-expressed with TRPV4) abrogates TRPV4 activation by cell swelling and heat. This inhibition requires the F-BAR domain; a PACSIN3 mutant lacking F-BAR still binds TRPV4 N-tails without affecting channel activation or PIP2-dependent tail rearrangement. PACSIN3 binding restricts TRPV4 access to PIP2 and prevents PIP2-induced tail rearrangement required for channel gating by physiological stimuli.","method":"FRET analysis of TRPV4 tail proximity, electrophysiology (patch-clamp), translocatable phosphatase PIP2 depletion, domain deletion mutagenesis, heterologous expression","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — FRET, electrophysiology, mutagenesis and PIP2 manipulation provide strong mechanistic evidence in single study","pmids":["23690576"],"is_preprint":false},{"year":2018,"finding":"NMR structure of the PACSIN3 SH3 domain in complex with the TRPV4 N-terminal proline-rich region (PRR) was determined; the PRR binds as a class I polyproline II (PPII) helix with a conserved cis-proline breaking the PPII conformation. SH3 binding rigidifies both the PRR and the adjacent PIP2-binding site. PACSIN1, 2, and 3 SH3 domains all bind TRPV4 N-terminus, with Syndapin/PACSIN binding influencing the PIP2 site but not vice versa, establishing a hierarchical interaction network.","method":"NMR structure determination, isothermal titration calorimetry (ITC) affinity measurements, domain mutagenesis","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 — atomic-resolution NMR structure with quantitative affinity data and functional interpretation","pmids":["30244966"],"is_preprint":false},{"year":2019,"finding":"IL-6 post-transcriptionally downregulates Pacsin3 protein in differentiating rat primary skeletal myoblasts (via miR-154-3p and/or miR-338-3p induction), while IGF-I does not affect Pacsin3 expression, suggesting cytokine-specific regulation of Pacsin3 during muscle differentiation.","method":"miRNA microarray, qRT-PCR, Western blot, wound healing migration assay in primary rat skeletal myoblasts","journal":"Cell and tissue research","confidence":"Low","confidence_rationale":"Tier 3 — Western blot and qRT-PCR showing regulation; no direct functional rescue of PACSIN3 performed","pmids":["31820147"],"is_preprint":false},{"year":2021,"finding":"PACSIN3 positions the mechanosensitive Piezo1 channel at the intercellular bridge (ICB) during cytokinesis; genetic or pharmacological inhibition of Pacsin3 causes mislocation of Rab11-FIP3 endosomes, ALIX, and ESCRT-III at the ICB, impairs abscission, and leads to multinucleation, establishing PACSIN3 as required for Piezo1 positioning and proper endosome trafficking during cytokinetic abscission.","method":"siRNA knockdown, live-cell imaging, immunofluorescence, in vitro and in vivo multinucleation assays","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotype and localization data, single lab","pmids":["34714681"],"is_preprint":false},{"year":2022,"finding":"PACSIN3 is abundant in muscle tissue and necessary for caveolar biogenesis, creating membrane reservoirs that control muscle function; loss of PACSIN3 function is linked to muscular disorders.","method":"Review summarizing experimental data from multiple studies (in vivo models, caveolae biogenesis assays)","journal":"Acta physiologica","confidence":"Medium","confidence_rationale":"Tier 3 — review with reference to experimental in vivo data; caveolar biogenesis role replicated across studies","pmids":["34990060"],"is_preprint":false}],"current_model":"PACSIN3 is an F-BAR/SH3 domain scaffold protein that couples membrane deformation and endocytosis with cytoskeletal regulation: its SH3 domain binds proline-rich motifs in TRPV4 (inhibiting channel gating by blocking PIP2 access), ADAM12 (promoting proHB-EGF shedding), dynamin, N-WASP, synaptojanin-1, and Sos; its F-BAR domain drives phosphoinositide-dependent membrane remodeling required for caveolar biogenesis in muscle, notochord morphogenesis, and positioning of Piezo1/endosome machinery at the cytokinetic bridge, while its vesicle-trafficking function also controls GLUT1 plasma membrane localization in adipocytes."},"narrative":{"teleology":[{"year":2000,"claim":"Cloning of PACSIN3 established it as a ubiquitous SH3-domain adaptor linking dynamin, N-WASP, and synaptojanin-1 to endocytic membrane trafficking, resolving the question of whether a non-neuronal PACSIN family member existed with conserved SH3-mediated endocytic functions.","evidence":"cDNA cloning, GST pull-down, co-immunoprecipitation, transferrin endocytosis assay with SH3 mutagenesis in cultured cells","pmids":["11082044"],"confidence":"High","gaps":["Tissue-specific functions not addressed","No in vivo loss-of-function data","F-BAR domain function unexplored"]},{"year":2003,"claim":"Identification of ADAM12 and Sos as PACSIN3 SH3-domain partners expanded its interactome beyond core endocytic machinery, revealing roles in EGFR transactivation via proHB-EGF shedding and in Ras/actin signaling.","evidence":"Yeast two-hybrid, GST pull-down, co-IP, siRNA knockdown with proHB-EGF shedding assay (ADAM12); SILAC peptide pull-down with IP confirmation (Sos)","pmids":["12952982","14679214"],"confidence":"High","gaps":["In vivo relevance of ADAM12–PACSIN3 axis unknown","Whether Sos interaction modulates Ras signaling directly untested"]},{"year":2006,"claim":"Discovery that PACSIN3 specifically shifts TRPV4 to the plasma membrane by inhibiting its endocytosis answered how an SH3-domain scaffold could selectively regulate an ion channel's subcellular distribution, distinguishing PACSIN3 from the other isoforms.","evidence":"Yeast two-hybrid, co-IP, co-expression/localization, dynamin inhibition, domain mutational analysis in heterologous cells","pmids":["16627472"],"confidence":"High","gaps":["Mechanism of channel gating modulation not yet resolved","Endogenous tissue context not examined"]},{"year":2007,"claim":"PACSIN3 was shown to be upregulated during adipocyte differentiation and to increase plasma membrane GLUT1 (but not GLUT4) levels, establishing a cargo-selective vesicle trafficking role in metabolic cells.","evidence":"Overexpression in 3T3-L1 adipocytes, subcellular fractionation, photoaffinity labeling, glucose uptake assay","pmids":["17320047"],"confidence":"Medium","gaps":["No loss-of-function confirmation","Mechanism of GLUT1 selectivity over GLUT4 unknown","In vivo metabolic consequence not tested"]},{"year":2009,"claim":"Zebrafish pacsin3 morphant phenotypes and structural analysis of the F-BAR/EFC domain resolved the question of whether PACSIN3's membrane-remodeling activity is essential in vivo, linking phosphoinositide-dependent membrane tubulation to notochord cell polarization and migration during embryogenesis.","evidence":"Morpholino knockdown in zebrafish with rescue by Drosophila Syndapin, crystal structure of EFC domain, phosphoinositide binding assays, domain mutagenesis","pmids":["19997509"],"confidence":"High","gaps":["Mammalian in vivo knockout data still lacking at this stage","Specific phosphoinositide species preference in mammalian cells not mapped"]},{"year":2013,"claim":"Electrophysiology and FRET experiments revealed that PACSIN3 inhibits TRPV4 activation by cell swelling and heat through its F-BAR domain, which restricts PIP2 access to the channel's gating region — answering how PACSIN3 modulates channel function beyond trafficking.","evidence":"Patch-clamp electrophysiology, FRET analysis of TRPV4 tail proximity, translocatable phosphatase PIP2 depletion, F-BAR deletion mutagenesis","pmids":["23690576"],"confidence":"High","gaps":["Whether F-BAR-mediated membrane curvature or direct lipid sequestration underlies PIP2 restriction unresolved","In vivo physiological consequences of TRPV4 inhibition by PACSIN3 not tested"]},{"year":2018,"claim":"The NMR structure of the PACSIN3 SH3 domain bound to TRPV4's proline-rich region provided atomic-resolution insight into how SH3 binding rigidifies the adjacent PIP2-binding site, establishing a hierarchical allosteric mechanism for channel inhibition.","evidence":"NMR structure determination, isothermal titration calorimetry, domain mutagenesis","pmids":["30244966"],"confidence":"High","gaps":["Full-length PACSIN3–TRPV4 complex structure not available","Whether allosteric rigidification mechanism generalizes to other PACSIN3 targets unknown"]},{"year":2021,"claim":"PACSIN3 was shown to position Piezo1 and Rab11-FIP3/ESCRT-III endosomes at the intercellular bridge during cytokinesis, revealing an unexpected role for an F-BAR scaffold in abscission and demonstrating that loss causes multinucleation.","evidence":"siRNA knockdown, live-cell imaging, immunofluorescence, multinucleation assays in vitro and in vivo","pmids":["34714681"],"confidence":"Medium","gaps":["Whether PACSIN3 recruits Piezo1 directly or via an intermediate adaptor is unclear","Mechanism linking Piezo1 mechanosensing to abscission completion not defined","Single-lab finding awaiting independent replication"]},{"year":2022,"claim":"Synthesis of in vivo data established PACSIN3 as essential for caveolar biogenesis in muscle, creating membrane reservoirs critical for muscle function and linking PACSIN3 loss to muscular disorders.","evidence":"Review consolidating in vivo model data and caveolae biogenesis assays across studies","pmids":["34990060"],"confidence":"Medium","gaps":["Specific muscular disorder genetics involving PACSIN3 mutations in humans not demonstrated by primary studies in this timeline","Direct caveolin-PACSIN3 structural interaction not resolved"]},{"year":null,"claim":"How PACSIN3's F-BAR-mediated membrane remodeling is coordinated with its SH3-mediated protein interactions in a cargo- and tissue-specific manner, and whether PACSIN3 mutations cause human Mendelian disease, remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No human PACSIN3 disease-causing mutations reported in the timeline","No full-length structural model of PACSIN3 in complex with a membrane","Cargo selectivity mechanism (e.g., GLUT1 vs GLUT4) not explained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,4,8,11]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,3]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[7,8]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4,5,8]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,5,11]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,4,5,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,8]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11]}],"complexes":[],"partners":["DNM1","NWASP","SYNJ1","TRPV4","ADAM12","SOS1","PIEZO1"],"other_free_text":[]},"mechanistic_narrative":"PACSIN3 is an F-BAR/SH3 domain scaffold protein that couples membrane remodeling with endocytic trafficking and cytoskeletal regulation in muscle, epithelial, and dividing cells. Its C-terminal SH3 domain binds proline-rich motifs in dynamin, N-WASP, synaptojanin-1, Sos, TRPV4, and ADAM12, thereby coordinating vesicle fission, actin polymerization, ion channel gating, and ectodomain shedding [PMID:11082044, PMID:16627472, PMID:12952982]. The N-terminal F-BAR domain dimerizes, binds phosphoinositides, and drives membrane tubulation required for caveolar biogenesis in muscle, notochord morphogenesis in zebrafish, and correct positioning of Piezo1 and Rab11-FIP3 endosomes at the cytokinetic bridge during abscission [PMID:19997509, PMID:34714681, PMID:34990060]. PACSIN3 also inhibits TRPV4 channel activation by restricting PIP2 access to the channel's gating domain, as demonstrated by FRET, electrophysiology, and NMR structural studies of the SH3–TRPV4 complex [PMID:23690576, PMID:30244966]."},"prefetch_data":{"uniprot":{"accession":"Q9UKS6","full_name":"Protein kinase C and casein kinase substrate in neurons protein 3","aliases":["SH3 domain-containing protein 6511"],"length_aa":424,"mass_kda":48.5,"function":"Plays a role in endocytosis and regulates internalization of plasma membrane proteins. Overexpression impairs internalization of SLC2A1/GLUT1 and TRPV4 and increases the levels of SLC2A1/GLUT1 and TRPV4 at the cell membrane. Inhibits the TRPV4 calcium channel activity (By similarity)","subcellular_location":"Cytoplasm; Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q9UKS6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PACSIN3","classification":"Not Classified","n_dependent_lines":19,"n_total_lines":1208,"dependency_fraction":0.015728476821192054},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000165912","cell_line_id":"CID000663","localizations":[{"compartment":"membrane","grade":3},{"compartment":"cell_contact","grade":2},{"compartment":"cytoplasmic","grade":1}],"interactors":[{"gene":"COBL","stoichiometry":4.0},{"gene":"CCDC22","stoichiometry":0.2},{"gene":"CCDC93","stoichiometry":0.2},{"gene":"COMMD4","stoichiometry":0.2},{"gene":"PACSIN2","stoichiometry":0.2},{"gene":"PATL1","stoichiometry":0.2},{"gene":"RAI14","stoichiometry":0.2},{"gene":"TRIOBP","stoichiometry":0.2},{"gene":"COBLL1","stoichiometry":0.2},{"gene":"MPRIP","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000663","total_profiled":1310},"omim":[{"mim_id":"621343","title":"CONGENITAL MYOPATHY 27; CMYO27","url":"https://www.omim.org/entry/621343"},{"mim_id":"606513","title":"PROTEIN KINASE C AND CASEIN KINASE SUBSTRATE IN NEURONS 3; PACSIN3","url":"https://www.omim.org/entry/606513"},{"mim_id":"606512","title":"PROTEIN KINASE C AND CASEIN KINASE SUBSTRATE IN NEURONS 1; PACSIN1","url":"https://www.omim.org/entry/606512"},{"mim_id":"143100","title":"HUNTINGTON DISEASE; HD","url":"https://www.omim.org/entry/143100"},{"mim_id":"138140","title":"SOLUTE CARRIER FAMILY 2 (FACILITATED GLUCOSE TRANSPORTER), MEMBER 1; SLC2A1","url":"https://www.omim.org/entry/138140"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"heart muscle","ntpm":155.2},{"tissue":"skeletal muscle","ntpm":450.8},{"tissue":"tongue","ntpm":260.7}],"url":"https://www.proteinatlas.org/search/PACSIN3"},"hgnc":{"alias_symbol":["SDPIII"],"prev_symbol":[]},"alphafold":{"accession":"Q9UKS6","domains":[{"cath_id":"1.20.1270.60","chopping":"16-290","consensus_level":"medium","plddt":97.1747,"start":16,"end":290},{"cath_id":"2.30.30.40","chopping":"365-420","consensus_level":"high","plddt":89.8054,"start":365,"end":420}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKS6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKS6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKS6-F1-predicted_aligned_error_v6.png","plddt_mean":86.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PACSIN3","jax_strain_url":"https://www.jax.org/strain/search?query=PACSIN3"},"sequence":{"accession":"Q9UKS6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UKS6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UKS6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKS6"}},"corpus_meta":[{"pmid":"23690576","id":"PMC_23690576","title":"Phosphatidylinositol-4,5-biphosphate-dependent rearrangement of TRPV4 cytosolic tails enables channel activation by physiological stimuli.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/23690576","citation_count":123,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12952982","id":"PMC_12952982","title":"PACSIN3 binds ADAM12/meltrin alpha and up-regulates ectodomain shedding of heparin-binding epidermal growth factor-like growth factor.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12952982","citation_count":73,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"19997509","id":"PMC_19997509","title":"Structural requirements for PACSIN/Syndapin operation during zebrafish embryonic notochord development.","date":"2009","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/19997509","citation_count":39,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"30244966","id":"PMC_30244966","title":"Structural Basis of TRPV4 N Terminus Interaction with Syndapin/PACSIN1-3 and PIP2.","date":"2018","source":"Structure (London, England : 1993)","url":"https://pubmed.ncbi.nlm.nih.gov/30244966","citation_count":34,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34990060","id":"PMC_34990060","title":"PACSIN proteins in vivo: Roles in development and physiology.","date":"2022","source":"Acta physiologica (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/34990060","citation_count":33,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18179684","id":"PMC_18179684","title":"Identification and transcript analysis of a novel wallaby (Macropus eugenii) basal-like breast cancer cell line.","date":"2008","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/18179684","citation_count":29,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"34714681","id":"PMC_34714681","title":"The mechanosensitive Piezo1 channel controls endosome trafficking for an efficient cytokinetic abscission.","date":"2021","source":"Science advances","url":"https://pubmed.ncbi.nlm.nih.gov/34714681","citation_count":25,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"31041394","id":"PMC_31041394","title":"Homozygous TRPV4 mutation causes congenital distal spinal muscular atrophy and arthrogryposis.","date":"2019","source":"Neurology. 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Overexpression of PACSIN3 enhanced TPA-induced proHB-EGF ectodomain shedding, while siRNA knockdown of PACSIN3 attenuated shedding induced by TPA and angiotensin II, establishing PACSIN3 as an up-regulator of ADAM12-mediated proHB-EGF shedding.\",\n      \"method\": \"Yeast two-hybrid screen, GST pulldown, co-immunoprecipitation, co-localization, siRNA knockdown, ectodomain shedding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (pulldown, co-IP, co-localization, siRNA KD with defined phenotype) in single study\",\n      \"pmids\": [\"12952982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Zebrafish Pacsin3 (ortholog of mammalian PACSIN3) is required for notochord formation during embryonic development; pacsin3 morphants show defective midline convergence of notochord precursors with failure to polarize, migrate, and differentiate. Rescue by Drosophila Syndapin required both the membrane-inserting prong of the EFC/F-BAR domain and the ability of the antiparallel dimer to bind phosphoinositides, linking Pacsin3's membrane-deforming activity to endocytosis-coupled directional cell migration.\",\n      \"method\": \"Morpholino knockdown in zebrafish, structural analysis of EFC domain (X-ray crystallography of Drosophila Syndapin), rescue with domain mutants, biochemical phosphoinositide binding assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — combined structure, biochemistry, and in vivo reverse genetics with domain-specific rescue\",\n      \"pmids\": [\"19997509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PACSIN3 binds to the N-terminal proline-rich region of TRPV4 and abrogates channel activation by cell swelling and heat. The F-BAR domain of PACSIN3 is required for this inhibitory effect; a PACSIN3 construct lacking the F-BAR domain still interacted with TRPV4 N-tails but did not affect channel activation or tail rearrangement. PACSIN3 binding restricts TRPV4 access to PIP2, altering tail conformation and negatively affecting hypotonicity- and heat-induced channel activation as measured by FRET.\",\n      \"method\": \"Co-expression in heterologous systems, FRET analysis of TRPV4 tail conformation, electrophysiology (channel activation assays), domain deletion mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (FRET, electrophysiology, mutagenesis) in a highly-cited study\",\n      \"pmids\": [\"23690576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Overexpression of PACSIN3 in 3T3-L1 adipocytes elevated glucose uptake by selectively increasing GLUT1 (but not GLUT4) plasma membrane localization, as shown by subcellular fractionation and photoaffinity labeling of cell surface GLUT proteins. PACSIN3 is the only PACSIN isoform whose expression increases during adipocyte differentiation.\",\n      \"method\": \"Overexpression in 3T3-L1 adipocytes, subcellular fractionation, photoaffinity labeling, glucose uptake assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — clean overexpression with defined cellular phenotype and two orthogonal localization methods, single lab\",\n      \"pmids\": [\"17320047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PACSIN3 (along with PACSIN2) was identified as a FasL interacting protein in Schwann cells via a proteomics approach, linking PACSIN3 to endocytosis and trafficking of FasL in the nervous system.\",\n      \"method\": \"Proteomics/pull-down screen in Schwann cells\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single proteomics screen, no follow-up functional validation reported\",\n      \"pmids\": [\"17761170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The NMR structure of the PACSIN3 SH3 domain in complex with the TRPV4 N-terminal proline-rich region (PRR) revealed that the TRPV4 PRR binds as a class I polyproline II (PPII) helix, with the PPII conformation broken by a conserved cis-proline. SH3 domain binding rigidifies both the PRR and the adjacent PIP2 binding site. Affinities of the TRPV4 N terminus for PACSIN1, 2, and 3 SH3 domains and PIP2 were determined, showing that Syndapin/PACSIN binding influences the PIP2 binding site but not vice versa.\",\n      \"method\": \"NMR structure determination, isothermal titration calorimetry (affinity measurements), mutagenesis\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution NMR structure with functional binding affinity measurements and mechanistic validation\",\n      \"pmids\": [\"30244966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PACSIN3 is required for positioning of the mechanosensitive Piezo1 channel at the intercellular bridge (ICB) during cytokinesis. Genetic inhibition of Pacsin3 resulted in mislocation of Rab11-FIP3 endosomes, ALIX, and ESCRT-III components at the ICB, causing cytokinetic abscission failure and multinucleation.\",\n      \"method\": \"Genetic inhibition (siRNA/morpholino), live cell imaging, immunofluorescence localization, cytokinesis functional assays in vitro and in vivo\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO/KD with defined cellular phenotype (multinucleation, mislocalization of multiple abscission factors), single lab\",\n      \"pmids\": [\"34714681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IL-6 post-transcriptionally downregulates Pacsin3 protein expression in differentiating primary rat skeletal muscle cells (via increased miR-154-3p and miR-338-3p), while IGF-I does not affect Pacsin3, establishing cytokine-specific post-transcriptional regulation of PACSIN3 in muscle.\",\n      \"method\": \"miRNA microarray, qRT-PCR, Western blot, wound healing assay in primary rat skeletal myoblasts\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, miRNA-mediated downregulation inferred but not directly demonstrated by miRNA inhibitor rescue\",\n      \"pmids\": [\"31820147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PACSIN3 is necessary for caveolar biogenesis in muscle tissue, creating membrane reservoirs that control muscle function; loss of PACSIN3 function has been linked to genetic muscular disorders.\",\n      \"method\": \"Review summarizing in vivo animal model data and human genetic studies\",\n      \"journal\": \"Acta physiologica (Oxford, England)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — review summary without primary experimental detail in this abstract\",\n      \"pmids\": [\"34990060\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PACSIN3 is an F-BAR/SH3 domain scaffold protein that uses its SH3 domain to bind proline-rich regions in partners such as TRPV4 (desensitizing the channel by restricting its PIP2 access, as defined by NMR structure and electrophysiology) and ADAM12 (upregulating proHB-EGF ectodomain shedding), while its F-BAR domain drives membrane deformation required for endocytosis-coupled processes including GLUT1 trafficking in adipocytes, notochord cell polarization in development, Piezo1 positioning at the cytokinetic bridge, and caveolar biogenesis in muscle.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"PACSIN3 was cloned and found to differ from PACSIN1/2 by having a short proline-rich region and lacking NPF motifs; it is mainly expressed in lung and muscle tissues. All three PACSIN isoforms bind dynamin, synaptojanin 1, and N-WASP via their SH3 domains, co-localize with dynamin (but not clathrin), and overexpression inhibits transferrin endocytosis in a dose-dependent, SH3-domain-dependent manner.\",\n      \"method\": \"cDNA cloning, GST pull-down, co-immunoprecipitation, co-localization microscopy, transferrin endocytosis assay, SH3-domain mutagenesis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assays + mutagenesis + functional endocytosis readout in single foundational paper\",\n      \"pmids\": [\"11082044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PACSIN3 SH3 domain specifically binds a proline-rich sequence of the Sos protein, linking PACSIN3 to actin remodeling/endocytic signaling downstream of Sos.\",\n      \"method\": \"Synthetic peptide affinity pull-down with SILAC-based quantitative mass spectrometry, confirmed by immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — SILAC peptide pull-down plus IP confirmation, single study\",\n      \"pmids\": [\"14679214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PACSIN3 binds the cytoplasmic domain of ADAM12/meltrin alpha via a proline-rich region (residues 829–840) of ADAM12; overexpression of PACSIN3 enhances TPA-induced proHB-EGF ectodomain shedding, while siRNA knockdown of PACSIN3 significantly attenuates shedding induced by TPA and angiotensin II, establishing PACSIN3 as an up-regulator of ADAM12-mediated proHB-EGF shedding and EGFR transactivation.\",\n      \"method\": \"Yeast two-hybrid screen, GST pull-down, co-immunoprecipitation, co-localization, siRNA knockdown, proHB-EGF shedding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Y2H, GST pull-down, Co-IP, siRNA + functional assay) in single study\",\n      \"pmids\": [\"12952982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PACSIN/Syndapin proteins, including PACSIN3, link membrane trafficking with the cytoskeleton through SH3-domain-mediated interactions with dynamin (vesicle fission) and N-WASP (Arp2/3-dependent actin polymerization), and can oligomerize to couple actin polymerization bursts with vesicle fission.\",\n      \"method\": \"Review/synthesis of biochemical interaction data (pull-down, Co-IP, domain mapping) from multiple studies\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review synthesizing multiple experimental studies; mechanistic model well-supported\",\n      \"pmids\": [\"15226389\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"All three PACSIN isoforms bind the N-terminus of TRPV4 via their SH3 domains; PACSIN3 specifically shifts TRPV4 localization toward the plasma membrane (away from cytosol), an effect mimicked by blocking dynamin-mediated endocytosis, indicating PACSIN3 modulates TRPV4 subcellular distribution by inhibiting its endocytosis. Interaction requires both the proline-rich domain of TRPV4 upstream of its ankyrin repeats and the C-terminal SH3 domain of PACSIN3. PACSIN1/2 do not affect TRPV4 localization despite binding.\",\n      \"method\": \"Yeast two-hybrid screen, biochemical co-immunoprecipitation, co-expression/localization assays, dynamin inhibition, domain mutational analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding assays, mutagenesis, localization with functional consequence, replicated across isoforms\",\n      \"pmids\": [\"16627472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PACSIN3 is the only PACSIN isoform upregulated during 3T3-L1 adipocyte differentiation; overexpression of PACSIN3 increases glucose uptake by elevating plasma membrane localization of GLUT1 (but not GLUT4), as shown by subcellular fractionation and photoaffinity labeling, establishing a role for PACSIN3 in GLUT1 vesicle trafficking.\",\n      \"method\": \"Adipocyte differentiation assay, overexpression, subcellular fractionation, photoaffinity labeling of GLUT1/GLUT4, glucose uptake assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"17320047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PACSIN3 is identified as an interacting partner of FasL in Schwann cells via a proteomics approach, consistent with its role in endocytosis and trafficking of FasL to regulate its cell surface expression.\",\n      \"method\": \"Proteomic pull-down / affinity purification from Schwann cell lysates\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single proteomics identification, no functional follow-up for PACSIN3 specifically\",\n      \"pmids\": [\"17761170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Zebrafish Pacsin3 (Syndapin ortholog) is required for notochord formation: pacsin3 morphants fail to polarize, migrate, and differentiate axial mesodermal cells, causing stunted body axis. The phenotype is rescued by Drosophila Syndapin expression and depends critically on the membrane-inserting prong of the EFC/F-BAR domain and high-affinity phosphoinositide binding by the antiparallel EFC dimer, linking directional cell migration and endocytosis during embryonic morphogenesis.\",\n      \"method\": \"Morpholino knockdown (zebrafish), rescue by ectopic Drosophila Syndapin expression, crystal structure of Drosophila EFC domain, domain mutagenesis, biochemical phosphoinositide binding assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — structure + mutagenesis + in vivo rescue in single study with multiple orthogonal methods\",\n      \"pmids\": [\"19997509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PACSIN3 (co-expressed with TRPV4) abrogates TRPV4 activation by cell swelling and heat. This inhibition requires the F-BAR domain; a PACSIN3 mutant lacking F-BAR still binds TRPV4 N-tails without affecting channel activation or PIP2-dependent tail rearrangement. PACSIN3 binding restricts TRPV4 access to PIP2 and prevents PIP2-induced tail rearrangement required for channel gating by physiological stimuli.\",\n      \"method\": \"FRET analysis of TRPV4 tail proximity, electrophysiology (patch-clamp), translocatable phosphatase PIP2 depletion, domain deletion mutagenesis, heterologous expression\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — FRET, electrophysiology, mutagenesis and PIP2 manipulation provide strong mechanistic evidence in single study\",\n      \"pmids\": [\"23690576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NMR structure of the PACSIN3 SH3 domain in complex with the TRPV4 N-terminal proline-rich region (PRR) was determined; the PRR binds as a class I polyproline II (PPII) helix with a conserved cis-proline breaking the PPII conformation. SH3 binding rigidifies both the PRR and the adjacent PIP2-binding site. PACSIN1, 2, and 3 SH3 domains all bind TRPV4 N-terminus, with Syndapin/PACSIN binding influencing the PIP2 site but not vice versa, establishing a hierarchical interaction network.\",\n      \"method\": \"NMR structure determination, isothermal titration calorimetry (ITC) affinity measurements, domain mutagenesis\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic-resolution NMR structure with quantitative affinity data and functional interpretation\",\n      \"pmids\": [\"30244966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IL-6 post-transcriptionally downregulates Pacsin3 protein in differentiating rat primary skeletal myoblasts (via miR-154-3p and/or miR-338-3p induction), while IGF-I does not affect Pacsin3 expression, suggesting cytokine-specific regulation of Pacsin3 during muscle differentiation.\",\n      \"method\": \"miRNA microarray, qRT-PCR, Western blot, wound healing migration assay in primary rat skeletal myoblasts\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — Western blot and qRT-PCR showing regulation; no direct functional rescue of PACSIN3 performed\",\n      \"pmids\": [\"31820147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PACSIN3 positions the mechanosensitive Piezo1 channel at the intercellular bridge (ICB) during cytokinesis; genetic or pharmacological inhibition of Pacsin3 causes mislocation of Rab11-FIP3 endosomes, ALIX, and ESCRT-III at the ICB, impairs abscission, and leads to multinucleation, establishing PACSIN3 as required for Piezo1 positioning and proper endosome trafficking during cytokinetic abscission.\",\n      \"method\": \"siRNA knockdown, live-cell imaging, immunofluorescence, in vitro and in vivo multinucleation assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotype and localization data, single lab\",\n      \"pmids\": [\"34714681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PACSIN3 is abundant in muscle tissue and necessary for caveolar biogenesis, creating membrane reservoirs that control muscle function; loss of PACSIN3 function is linked to muscular disorders.\",\n      \"method\": \"Review summarizing experimental data from multiple studies (in vivo models, caveolae biogenesis assays)\",\n      \"journal\": \"Acta physiologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review with reference to experimental in vivo data; caveolar biogenesis role replicated across studies\",\n      \"pmids\": [\"34990060\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PACSIN3 is an F-BAR/SH3 domain scaffold protein that couples membrane deformation and endocytosis with cytoskeletal regulation: its SH3 domain binds proline-rich motifs in TRPV4 (inhibiting channel gating by blocking PIP2 access), ADAM12 (promoting proHB-EGF shedding), dynamin, N-WASP, synaptojanin-1, and Sos; its F-BAR domain drives phosphoinositide-dependent membrane remodeling required for caveolar biogenesis in muscle, notochord morphogenesis, and positioning of Piezo1/endosome machinery at the cytokinetic bridge, while its vesicle-trafficking function also controls GLUT1 plasma membrane localization in adipocytes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PACSIN3 is an F-BAR/SH3 domain scaffold protein that couples membrane deformation to endocytic trafficking and ion channel regulation across multiple cell types. Its SH3 domain binds proline-rich regions in partners such as TRPV4 and ADAM12: binding to the TRPV4 N-terminal proline-rich region rigidifies the adjacent PIP2 binding site (resolved by NMR), restricting PIP2 access and desensitizing channel activation by hypotonicity and heat [PMID:23690576, PMID:30244966], while interaction with ADAM12 upregulates proHB-EGF ectodomain shedding [PMID:12952982]. The F-BAR domain drives phosphoinositide-dependent membrane tubulation required for notochord cell polarization during zebrafish development [PMID:19997509], GLUT1 plasma-membrane trafficking in adipocytes [PMID:17320047], and proper positioning of Piezo1 and ESCRT-III components at the cytokinetic bridge during abscission [PMID:34714681].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of PACSIN3 as an SH3-dependent binding partner of ADAM12 established the gene's first known function: acting as a positive regulator of ectodomain shedding via an endocytosis-associated scaffold mechanism.\",\n      \"evidence\": \"Yeast two-hybrid, GST pulldown, co-IP, siRNA knockdown with proHB-EGF shedding readout in mammalian cells\",\n      \"pmids\": [\"12952982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which PACSIN3 upregulates shedding (direct ADAM12 activation vs. altered trafficking) not resolved\",\n        \"No in vivo confirmation of ADAM12–PACSIN3 shedding axis\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstration that PACSIN3 overexpression selectively increased GLUT1 surface levels and glucose uptake in adipocytes extended its function to transporter trafficking, while its upregulation during adipogenesis implied a physiological role in metabolic differentiation.\",\n      \"evidence\": \"Overexpression in 3T3-L1 adipocytes with subcellular fractionation and photoaffinity labeling\",\n      \"pmids\": [\"17320047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Loss-of-function data for GLUT1 trafficking not provided\",\n        \"Whether PACSIN3 acts via endocytic recycling or exocytic delivery of GLUT1 remains undefined\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Zebrafish pacsin3 morphants revealed a developmental requirement for the F-BAR domain's membrane-deforming and phosphoinositide-binding activities in notochord cell polarization, establishing that PACSIN3 links membrane curvature to directional cell migration in vivo.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish, X-ray crystallography of Drosophila Syndapin F-BAR, rescue with domain mutants\",\n      \"pmids\": [\"19997509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mammalian developmental phenotype of PACSIN3 loss not characterized\",\n        \"Specific endocytic cargo(es) mediating notochord polarization not identified\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that PACSIN3 desensitizes TRPV4 by restricting channel access to PIP2 — requiring the F-BAR domain for functional inhibition despite SH3-mediated binding — resolved the molecular logic of a scaffold that couples membrane remodeling to ion channel gating.\",\n      \"evidence\": \"FRET-based TRPV4 tail conformation assay, electrophysiology, domain deletion mutagenesis in heterologous cells\",\n      \"pmids\": [\"23690576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"In vivo significance of PACSIN3–TRPV4 axis in sensory or osmotic signaling not tested\",\n        \"Whether endogenous PIP2 pools are locally remodeled by the F-BAR domain was not shown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"NMR structure of the PACSIN3 SH3–TRPV4 PRR complex revealed a class I PPII helix recognition mode with a cis-proline break, and showed that SH3 binding allosterically rigidifies the PIP2 binding site, providing a structural basis for PACSIN3-mediated TRPV4 desensitization.\",\n      \"evidence\": \"NMR structure determination, isothermal titration calorimetry, mutagenesis\",\n      \"pmids\": [\"30244966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Full-length PACSIN3–TRPV4 complex structure not available\",\n        \"Whether allosteric rigidification applies to other PACSIN3–partner interactions is unknown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showing that PACSIN3 is required for positioning Piezo1 at the intercellular bridge and for recruiting Rab11-FIP3 endosomes, ALIX, and ESCRT-III during cytokinesis expanded PACSIN3's role to mechanosensitive channel positioning and abscission control.\",\n      \"evidence\": \"siRNA/morpholino genetic inhibition, live cell imaging, immunofluorescence in dividing cells\",\n      \"pmids\": [\"34714681\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct physical interaction between PACSIN3 and Piezo1 not demonstrated\",\n        \"Whether the F-BAR or SH3 domain mediates Piezo1 positioning was not dissected\",\n        \"Multinucleation phenotype not yet confirmed in a mammalian knockout model\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A full-length structural model of PACSIN3, its role in caveolar biogenesis at the molecular level, and the in vivo consequences of mammalian PACSIN3 knockout across tissues remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No mammalian PACSIN3 knockout phenotype has been characterized in detail in primary literature captured here\",\n        \"Molecular mechanism of PACSIN3 in caveolar biogenesis is inferred from reviews but lacks primary mechanistic dissection\",\n        \"Whether PACSIN3's multiple partner interactions are mutually exclusive or occur in distinct subcellular pools is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 3, 6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 3, 6]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ADAM12\",\n      \"TRPV4\",\n      \"PIEZO1\",\n      \"GLUT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"PACSIN3 is an F-BAR/SH3 domain scaffold protein that couples membrane remodeling with endocytic trafficking and cytoskeletal regulation in muscle, epithelial, and dividing cells. Its C-terminal SH3 domain binds proline-rich motifs in dynamin, N-WASP, synaptojanin-1, Sos, TRPV4, and ADAM12, thereby coordinating vesicle fission, actin polymerization, ion channel gating, and ectodomain shedding [PMID:11082044, PMID:16627472, PMID:12952982]. The N-terminal F-BAR domain dimerizes, binds phosphoinositides, and drives membrane tubulation required for caveolar biogenesis in muscle, notochord morphogenesis in zebrafish, and correct positioning of Piezo1 and Rab11-FIP3 endosomes at the cytokinetic bridge during abscission [PMID:19997509, PMID:34714681, PMID:34990060]. PACSIN3 also inhibits TRPV4 channel activation by restricting PIP2 access to the channel's gating domain, as demonstrated by FRET, electrophysiology, and NMR structural studies of the SH3–TRPV4 complex [PMID:23690576, PMID:30244966].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Cloning of PACSIN3 established it as a ubiquitous SH3-domain adaptor linking dynamin, N-WASP, and synaptojanin-1 to endocytic membrane trafficking, resolving the question of whether a non-neuronal PACSIN family member existed with conserved SH3-mediated endocytic functions.\",\n      \"evidence\": \"cDNA cloning, GST pull-down, co-immunoprecipitation, transferrin endocytosis assay with SH3 mutagenesis in cultured cells\",\n      \"pmids\": [\"11082044\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific functions not addressed\", \"No in vivo loss-of-function data\", \"F-BAR domain function unexplored\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identification of ADAM12 and Sos as PACSIN3 SH3-domain partners expanded its interactome beyond core endocytic machinery, revealing roles in EGFR transactivation via proHB-EGF shedding and in Ras/actin signaling.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, co-IP, siRNA knockdown with proHB-EGF shedding assay (ADAM12); SILAC peptide pull-down with IP confirmation (Sos)\",\n      \"pmids\": [\"12952982\", \"14679214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of ADAM12–PACSIN3 axis unknown\", \"Whether Sos interaction modulates Ras signaling directly untested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that PACSIN3 specifically shifts TRPV4 to the plasma membrane by inhibiting its endocytosis answered how an SH3-domain scaffold could selectively regulate an ion channel's subcellular distribution, distinguishing PACSIN3 from the other isoforms.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, co-expression/localization, dynamin inhibition, domain mutational analysis in heterologous cells\",\n      \"pmids\": [\"16627472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of channel gating modulation not yet resolved\", \"Endogenous tissue context not examined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"PACSIN3 was shown to be upregulated during adipocyte differentiation and to increase plasma membrane GLUT1 (but not GLUT4) levels, establishing a cargo-selective vesicle trafficking role in metabolic cells.\",\n      \"evidence\": \"Overexpression in 3T3-L1 adipocytes, subcellular fractionation, photoaffinity labeling, glucose uptake assay\",\n      \"pmids\": [\"17320047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No loss-of-function confirmation\", \"Mechanism of GLUT1 selectivity over GLUT4 unknown\", \"In vivo metabolic consequence not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Zebrafish pacsin3 morphant phenotypes and structural analysis of the F-BAR/EFC domain resolved the question of whether PACSIN3's membrane-remodeling activity is essential in vivo, linking phosphoinositide-dependent membrane tubulation to notochord cell polarization and migration during embryogenesis.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish with rescue by Drosophila Syndapin, crystal structure of EFC domain, phosphoinositide binding assays, domain mutagenesis\",\n      \"pmids\": [\"19997509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian in vivo knockout data still lacking at this stage\", \"Specific phosphoinositide species preference in mammalian cells not mapped\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Electrophysiology and FRET experiments revealed that PACSIN3 inhibits TRPV4 activation by cell swelling and heat through its F-BAR domain, which restricts PIP2 access to the channel's gating region — answering how PACSIN3 modulates channel function beyond trafficking.\",\n      \"evidence\": \"Patch-clamp electrophysiology, FRET analysis of TRPV4 tail proximity, translocatable phosphatase PIP2 depletion, F-BAR deletion mutagenesis\",\n      \"pmids\": [\"23690576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether F-BAR-mediated membrane curvature or direct lipid sequestration underlies PIP2 restriction unresolved\", \"In vivo physiological consequences of TRPV4 inhibition by PACSIN3 not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The NMR structure of the PACSIN3 SH3 domain bound to TRPV4's proline-rich region provided atomic-resolution insight into how SH3 binding rigidifies the adjacent PIP2-binding site, establishing a hierarchical allosteric mechanism for channel inhibition.\",\n      \"evidence\": \"NMR structure determination, isothermal titration calorimetry, domain mutagenesis\",\n      \"pmids\": [\"30244966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length PACSIN3–TRPV4 complex structure not available\", \"Whether allosteric rigidification mechanism generalizes to other PACSIN3 targets unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"PACSIN3 was shown to position Piezo1 and Rab11-FIP3/ESCRT-III endosomes at the intercellular bridge during cytokinesis, revealing an unexpected role for an F-BAR scaffold in abscission and demonstrating that loss causes multinucleation.\",\n      \"evidence\": \"siRNA knockdown, live-cell imaging, immunofluorescence, multinucleation assays in vitro and in vivo\",\n      \"pmids\": [\"34714681\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PACSIN3 recruits Piezo1 directly or via an intermediate adaptor is unclear\", \"Mechanism linking Piezo1 mechanosensing to abscission completion not defined\", \"Single-lab finding awaiting independent replication\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Synthesis of in vivo data established PACSIN3 as essential for caveolar biogenesis in muscle, creating membrane reservoirs critical for muscle function and linking PACSIN3 loss to muscular disorders.\",\n      \"evidence\": \"Review consolidating in vivo model data and caveolae biogenesis assays across studies\",\n      \"pmids\": [\"34990060\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific muscular disorder genetics involving PACSIN3 mutations in humans not demonstrated by primary studies in this timeline\", \"Direct caveolin-PACSIN3 structural interaction not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PACSIN3's F-BAR-mediated membrane remodeling is coordinated with its SH3-mediated protein interactions in a cargo- and tissue-specific manner, and whether PACSIN3 mutations cause human Mendelian disease, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No human PACSIN3 disease-causing mutations reported in the timeline\", \"No full-length structural model of PACSIN3 in complex with a membrane\", \"Cargo selectivity mechanism (e.g., GLUT1 vs GLUT4) not explained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 4, 8, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4, 5, 8]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 5, 11]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 4, 5, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"DNM1\", \"NWASP\", \"SYNJ1\", \"TRPV4\", \"ADAM12\", \"SOS1\", \"PIEZO1\"],\n    \"other_free_text\": []\n  }\n}\n```"}