{"gene":"RAPH1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2008,"finding":"Lamellipodin (RAPH1) contains proline-rich peptides that organize the four subunits of butyrylcholinesterase (BChE) into a 340 kDa tetramer by interacting with the C-terminal BChE tetramerization domain. A 17-amino-acid proline-rich peptide derived from lamellipodin drove assembly of human BChE secreted from CHO cells into tetramers.","method":"HPLC purification, electrospray ionization tandem MS, Edman degradation, CHO cell expression assay with proline-rich peptide addition","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of tetramer assembly with purified peptide, validated by MS sequencing and database identification, replicated in cell expression system","pmids":["18076380"],"is_preprint":false},{"year":2017,"finding":"The C5 variant of BChE includes a noncovalently bound ~60 kDa fragment encoded by the last exon of the RAPH1 gene (containing an N-terminal polyproline region). Western blot with an antibody to the C-terminus of lamellipodin confirmed its presence in C5 and cord BChE. In 90% of adults the 60 kDa fragment is shortened to 3 kDa during maturation, leaving only 10% with C5 BChE.","method":"Western blot with C-terminus-specific anti-lamellipodin antibody, native PAGE, MS analysis of C5 band","journal":"Molecules (Basel, Switzerland)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal antibody confirmation and MS in a single lab, two orthogonal methods but no mutagenesis or reconstitution of the 60 kDa fragment","pmids":["28661448"],"is_preprint":false},{"year":2016,"finding":"Genetic haplotype analysis of RAPH1 SNPs (rs2246118, rs3814365, rs2465520) showed that specific RAPH1 haplotypes associate with the CHE2 C5+ phenotype (presence/absence and intensity of the BChE C5 complex), corroborating that the RAPH1 gene is the CHE2 locus. BChE activity was higher in individuals with the intense C5+ haplotype (TGC) than the faint C5+ haplotype (CAC).","method":"SNP genotyping, haplotype association analysis in 126 individuals stratified by CHE2 C5 phenotype","journal":"Annals of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — genetic association across two phenotypic groups with multiple SNPs, consistent with prior biochemical data but no direct functional assay","pmids":["27346732"],"is_preprint":false},{"year":2015,"finding":"Lamellipodin/RAPH1 was characterized as a PI(3,4)P2-specific effector protein; it selectively binds PI(3,4)P2 (phosphatidylinositol 3,4-bisphosphate) generated downstream of class I PI3K and SHIP phosphatases, thereby linking this phosphoinositide to cell migration signaling.","method":"Review citing lipid-binding assays (PH domain binding to PI(3,4)P2 established in prior literature summarized in review)","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PI(3,4)P2 binding is well-established in the field and cited across multiple sources, but this paper is a review, so direct experimental method is from prior work not detailed in this abstract","pmids":["26022180"],"is_preprint":false},{"year":2008,"finding":"Supervillin overexpression redistributes lamellipodin/RAPH1 away from the cell periphery to internal sites, and lamellipodin/RAPH1 is a component of lamellipodial structures; its redistribution coincides with increased actin punctae at podosome/invadopodial sites.","method":"Fluorescence microscopy of EGFP-supervillin overexpression, immunolocalization of endogenous lamellipodin/RAPH1, RNAi knockdown","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct imaging of RAPH1 redistribution upon supervillin perturbation in living cells, single lab","pmids":["19109420"],"is_preprint":false},{"year":2021,"finding":"Lamellipodin (Raph1), a paralogue of RIAM, compensates for RIAM deficiency in regulatory T cells (Tregs) to support integrin activation (αLβ2, α4β1, α4β7) and Treg homing to gut-associated lymphoid tissue, whereas conventional T cells depend on RIAM and not lamellipodin for integrin activation.","method":"Apbb1ip-/- (RIAM-null) mouse model, Raph1 genetic comparison, integrin activation assays, in vivo homing experiments in IBD colitis model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse model with specific functional readouts (integrin activation, homing, colitis protection), multiple orthogonal in vivo and ex vivo assays","pmids":["33104169"],"is_preprint":false},{"year":2022,"finding":"Lamellipodin (RAPH1) is present in lamellipodia-like structures (LLS) that form independently of WAVE regulatory complex (WRC), identifying RAPH1 as a lamellipodial component in a WRC-independent Rac/Cdc42-driven Arp2/3-dependent actin remodeling pathway. Unlike Ena/VASP proteins, RAPH1 was recruited to these LLS.","method":"Genome editing (Nap1/Hem1 double knockout) in B16-F1 melanoma cells, immunofluorescence localization of RAPH1 in LLS, growth factor and active GTPase stimulation","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic ablation of WRC with direct imaging of RAPH1 localization, single lab, two orthogonal genetic perturbations","pmids":["35971979"],"is_preprint":false},{"year":2022,"finding":"Raph1 (lamellipodin) is a novel substrate of NDR1/2 kinases; NDR1/2 phosphorylate Raph1, and both NDR1/2 and Raph1 are critical for endocytosis and membrane recycling in neurons. Loss of NDR1/2 leads to mislocalization and dysfunction consistent with impaired Raph1-dependent endocytic trafficking.","method":"Phosphoproteomics of Ndr1/2 knockout mouse brain, biochemical validation of Raph1 as NDR substrate, endocytosis and membrane recycling assays in knockout neurons","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomics plus functional validation in knockout model, single lab, two orthogonal approaches (MS and cell biology assays)","pmids":["36446521"],"is_preprint":false},{"year":2021,"finding":"Lamellipodin (RAPH1) expression is upregulated by increased extracellular matrix (ECM) stiffness via an integrin-dependent FAK-Cas-Rac signaling module. Lamellipodin overexpression increased stiffness-induced cyclin expression, cell proliferation, and intracellular stiffness, while lamellipodin knockdown reduced these responses in mouse embryonic fibroblasts.","method":"ECM stiffness manipulation, lamellipodin overexpression and siRNA knockdown, cyclin western blots, atomic force microscopy for intracellular stiffness, proliferation assays","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional (overexpression and knockdown) perturbations with multiple functional readouts in a single lab study","pmids":["34152388"],"is_preprint":false},{"year":2023,"finding":"A nuclear isoform of RAPH1 (RAPH1-i3) interacts with the transcription factor FOXQ1, as identified by co-immunoprecipitation and mass spectrometry. Co-expression of RAPH1-i3 and FOXQ1 activated STAT3 signaling and increased expression of CCND1, MCL1, Bcl-XL, and MMP2, promoting cell proliferation, migration, and radioresistance in triple-negative breast cancer cells.","method":"Co-immunoprecipitation, mass spectrometry, RAPH1-i3 overexpression and depletion, in vitro and in vivo radioresistance assays, western blot for downstream effectors","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with MS identification plus functional rescue experiments, single lab, multiple orthogonal approaches","pmids":["38062011"],"is_preprint":false}],"current_model":"RAPH1 (lamellipodin) is a PI(3,4)P2-binding PH-domain protein that localizes to lamellipodia and acts downstream of PI3K/Rap1 signaling to regulate actin dynamics, cell migration, and integrin activation; its proline-rich domain assembles butyrylcholinesterase tetramers via direct polyproline–tetramerization domain interaction; it is phosphorylated by NDR1/2 kinases to support endocytosis and membrane recycling in neurons; ECM stiffness induces its expression via integrin–FAK–Cas–Rac signaling to drive cyclin expression and proliferation; and a nuclear isoform (RAPH1-i3) interacts with FOXQ1 to activate STAT3 signaling and confer radioresistance in breast cancer."},"narrative":{"mechanistic_narrative":"RAPH1 (lamellipodin) is a PI(3,4)P2-binding effector that couples class I PI3K/SHIP-generated phosphoinositide signaling to actin-based cell migration [PMID:26022180]. It localizes to lamellipodia and lamellipodia-like structures, where it functions as a component of Arp2/3-dependent actin remodeling that can proceed independently of the WAVE regulatory complex in a Rac/Cdc42-driven pathway [PMID:35971979]; its peripheral distribution is dynamically controlled, as supervillin overexpression redistributes RAPH1 from the cell edge toward internal podosome/invadopodial sites [PMID:19109420]. As a paralogue of RIAM, RAPH1 supports integrin activation and homing selectively in regulatory T cells, compensating for RIAM deficiency [PMID:33104169], and its expression is induced by ECM stiffness through an integrin-FAK-Cas-Rac module to drive cyclin expression and proliferation [PMID:34152388]. RAPH1 is phosphorylated by NDR1/2 kinases to support endocytosis and membrane recycling in neurons [PMID:36446521]. Independently of its actin-regulatory role, the proline-rich region encoded by the terminal RAPH1 exon assembles butyrylcholinesterase into 340 kDa tetramers via direct interaction with the BChE tetramerization domain, defining RAPH1 as the CHE2 locus underlying the BChE C5 variant [PMID:18076380, PMID:28661448, PMID:27346732]. A nuclear isoform, RAPH1-i3, interacts with FOXQ1 to activate STAT3 signaling and confer proliferation, migration, and radioresistance in triple-negative breast cancer [PMID:38062011].","teleology":[{"year":2008,"claim":"Established an unexpected non-cytoskeletal function for RAPH1: its proline-rich peptides organize the catalytic subunits of butyrylcholinesterase into tetramers, explaining how a secreted enzyme acquires its mature oligomeric state.","evidence":"HPLC/MS peptide sequencing and CHO cell reconstitution of BChE tetramer assembly with a 17-residue proline-rich peptide","pmids":["18076380"],"confidence":"High","gaps":["Does not define the stoichiometry or affinity of the polyproline-tetramerization domain interaction in vivo","Does not connect this assembly function to RAPH1's actin-regulatory roles"]},{"year":2008,"claim":"Placed RAPH1 in the lamellipodial actin machinery and showed its localization is regulated, with supervillin redirecting it from the cell periphery to invadopodial sites.","evidence":"Fluorescence microscopy, immunolocalization of endogenous RAPH1, and RNAi in cultured cells overexpressing EGFP-supervillin","pmids":["19109420"],"confidence":"Medium","gaps":["Mechanism by which supervillin redistributes RAPH1 is not defined","Functional consequence of relocalization for invadopodia is correlative"]},{"year":2015,"claim":"Defined the phosphoinositide specificity that places RAPH1 downstream of PI3K signaling, identifying it as a PI(3,4)P2-selective effector linking lipid signals to migration.","evidence":"Review summarizing PH-domain lipid-binding assays for PI(3,4)P2 selectivity downstream of class I PI3K and SHIP","pmids":["26022180"],"confidence":"Medium","gaps":["Primary binding data are summarized rather than generated here","Does not establish in vivo membrane recruitment kinetics"]},{"year":2016,"claim":"Confirmed genetically that the RAPH1 gene is the CHE2 locus controlling the BChE C5 phenotype, linking specific haplotypes to C5 presence and BChE activity.","evidence":"SNP genotyping and haplotype association analysis in 126 individuals stratified by C5 phenotype","pmids":["27346732"],"confidence":"Medium","gaps":["Association is correlative without functional dissection of individual SNPs","Does not explain how haplotype affects fragment processing"]},{"year":2017,"claim":"Identified the molecular basis of the BChE C5 variant as a noncovalently bound ~60 kDa fragment encoded by the terminal RAPH1 exon, and showed it is normally shortened during maturation.","evidence":"Western blot with C-terminus-specific anti-lamellipodin antibody, native PAGE, and MS of the C5 band","pmids":["28661448"],"confidence":"Medium","gaps":["The 60 kDa fragment was not reconstituted or mutagenized","Mechanism and protease responsible for maturation shortening unknown"]},{"year":2021,"claim":"Demonstrated a cell-type-specific integrin-regulatory role: RAPH1 substitutes for its paralogue RIAM in regulatory T cells to activate integrins and drive gut homing.","evidence":"Apbb1ip-/- (RIAM-null) mouse with Raph1 genetic comparison, integrin activation assays, and in vivo homing in a colitis model","pmids":["33104169"],"confidence":"High","gaps":["Why Tregs but not conventional T cells rely on RAPH1 is unresolved","Direct interaction with integrin activation machinery not mapped"]},{"year":2021,"claim":"Connected mechanotransduction to RAPH1 expression, showing ECM stiffness induces RAPH1 via integrin-FAK-Cas-Rac to promote cyclin expression and proliferation.","evidence":"ECM stiffness manipulation with RAPH1 overexpression/siRNA, cyclin western blots, AFM stiffness measurement, and proliferation assays in MEFs","pmids":["34152388"],"confidence":"Medium","gaps":["Transcriptional mechanism of stiffness-induced RAPH1 expression unknown","Single cell-type study"]},{"year":2022,"claim":"Identified RAPH1 as an NDR1/2 kinase substrate required for neuronal endocytosis and membrane recycling, extending its function to membrane trafficking.","evidence":"Phosphoproteomics of Ndr1/2 knockout mouse brain, biochemical substrate validation, and endocytosis/recycling assays in knockout neurons","pmids":["36446521"],"confidence":"Medium","gaps":["Phosphosites and their functional impact on RAPH1 not fully mapped","Direct role of RAPH1 phosphorylation in the trafficking defect not isolated from NDR1/2 loss"]},{"year":2022,"claim":"Refined RAPH1's place in actin remodeling by showing it is recruited to lamellipodia-like structures that form without the WAVE regulatory complex, distinguishing it from Ena/VASP proteins.","evidence":"Nap1/Hem1 double-knockout B16-F1 cells with immunofluorescence localization of RAPH1 and GTPase/growth-factor stimulation","pmids":["35971979"],"confidence":"Medium","gaps":["Recruitment mechanism to WRC-independent structures not defined","Functional requirement of RAPH1 for these structures not tested"]},{"year":2023,"claim":"Revealed a nuclear function for a RAPH1 isoform: RAPH1-i3 binds FOXQ1 to activate STAT3 and drive proliferation, migration, and radioresistance in breast cancer.","evidence":"Co-IP/MS identification of FOXQ1, RAPH1-i3 overexpression/depletion, downstream effector westerns, and in vitro/in vivo radioresistance assays","pmids":["38062011"],"confidence":"Medium","gaps":["How a nuclear isoform arises and localizes is not defined","Mechanism by which the FOXQ1 complex activates STAT3 not resolved"]},{"year":null,"claim":"How RAPH1's distinct activities — PI(3,4)P2-dependent lamellipodial actin regulation, integrin activation, membrane trafficking, BChE tetramerization, and the nuclear FOXQ1/STAT3 axis — are partitioned across isoforms and cell types remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model relating domains to the separate functions","Isoform-specific functional assignment incomplete","No structural data on RAPH1 complexes"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[3]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[4,6]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,6]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,6]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[8]}],"complexes":["butyrylcholinesterase tetramer"],"partners":["BCHE","FOXQ1","SVIL","STK38","STK38L"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q70E73","full_name":"Ras-associated and pleckstrin homology domains-containing protein 1","aliases":["Amyotrophic lateral sclerosis 2 chromosomal region candidate gene 18 protein","Amyotrophic lateral sclerosis 2 chromosomal region candidate gene 9 protein","Lamellipodin","Proline-rich EVH1 ligand 2","PREL-2","Protein RMO1"],"length_aa":1250,"mass_kda":135.3,"function":"Mediator of localized membrane signals. Implicated in the regulation of lamellipodial dynamics. Negatively regulates cell adhesion","subcellular_location":"Cell membrane; Cell projection, lamellipodium; Cell projection, filopodium; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q70E73/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RAPH1","classification":"Not Classified","n_dependent_lines":40,"n_total_lines":1208,"dependency_fraction":0.033112582781456956},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PFN1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RAPH1","total_profiled":1310},"omim":[{"mim_id":"609036","title":"APBB1-INTERACTING PROTEIN; APBB1IP","url":"https://www.omim.org/entry/609036"},{"mim_id":"609035","title":"RAS ASSOCIATION AND PLECKSTRIN HOMOLOGY DOMAINS-CONTAINING PROTEIN 1; RAPH1","url":"https://www.omim.org/entry/609035"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear bodies","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"liver","ntpm":57.5}],"url":"https://www.proteinatlas.org/search/RAPH1"},"hgnc":{"alias_symbol":["KIAA1681"],"prev_symbol":["ALS2CR9","ALS2CR18"]},"alphafold":{"accession":"Q70E73","domains":[{"cath_id":"3.10.20.90","chopping":"259-354","consensus_level":"medium","plddt":93.3355,"start":259,"end":354},{"cath_id":"2.30.29.30","chopping":"359-515","consensus_level":"medium","plddt":94.496,"start":359,"end":515}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q70E73","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q70E73-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q70E73-F1-predicted_aligned_error_v6.png","plddt_mean":56.28},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RAPH1","jax_strain_url":"https://www.jax.org/strain/search?query=RAPH1"},"sequence":{"accession":"Q70E73","fasta_url":"https://rest.uniprot.org/uniprotkb/Q70E73.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q70E73/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q70E73"}},"corpus_meta":[{"pmid":"26022180","id":"PMC_26022180","title":"Phosphatidylinositol 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A 17-amino-acid proline-rich peptide derived from lamellipodin drove assembly of human BChE secreted from CHO cells into tetramers.\",\n      \"method\": \"HPLC purification, electrospray ionization tandem MS, Edman degradation, CHO cell expression assay with proline-rich peptide addition\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of tetramer assembly with purified peptide, validated by MS sequencing and database identification, replicated in cell expression system\",\n      \"pmids\": [\"18076380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The C5 variant of BChE includes a noncovalently bound ~60 kDa fragment encoded by the last exon of the RAPH1 gene (containing an N-terminal polyproline region). Western blot with an antibody to the C-terminus of lamellipodin confirmed its presence in C5 and cord BChE. In 90% of adults the 60 kDa fragment is shortened to 3 kDa during maturation, leaving only 10% with C5 BChE.\",\n      \"method\": \"Western blot with C-terminus-specific anti-lamellipodin antibody, native PAGE, MS analysis of C5 band\",\n      \"journal\": \"Molecules (Basel, Switzerland)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal antibody confirmation and MS in a single lab, two orthogonal methods but no mutagenesis or reconstitution of the 60 kDa fragment\",\n      \"pmids\": [\"28661448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Genetic haplotype analysis of RAPH1 SNPs (rs2246118, rs3814365, rs2465520) showed that specific RAPH1 haplotypes associate with the CHE2 C5+ phenotype (presence/absence and intensity of the BChE C5 complex), corroborating that the RAPH1 gene is the CHE2 locus. BChE activity was higher in individuals with the intense C5+ haplotype (TGC) than the faint C5+ haplotype (CAC).\",\n      \"method\": \"SNP genotyping, haplotype association analysis in 126 individuals stratified by CHE2 C5 phenotype\",\n      \"journal\": \"Annals of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genetic association across two phenotypic groups with multiple SNPs, consistent with prior biochemical data but no direct functional assay\",\n      \"pmids\": [\"27346732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Lamellipodin/RAPH1 was characterized as a PI(3,4)P2-specific effector protein; it selectively binds PI(3,4)P2 (phosphatidylinositol 3,4-bisphosphate) generated downstream of class I PI3K and SHIP phosphatases, thereby linking this phosphoinositide to cell migration signaling.\",\n      \"method\": \"Review citing lipid-binding assays (PH domain binding to PI(3,4)P2 established in prior literature summarized in review)\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PI(3,4)P2 binding is well-established in the field and cited across multiple sources, but this paper is a review, so direct experimental method is from prior work not detailed in this abstract\",\n      \"pmids\": [\"26022180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Supervillin overexpression redistributes lamellipodin/RAPH1 away from the cell periphery to internal sites, and lamellipodin/RAPH1 is a component of lamellipodial structures; its redistribution coincides with increased actin punctae at podosome/invadopodial sites.\",\n      \"method\": \"Fluorescence microscopy of EGFP-supervillin overexpression, immunolocalization of endogenous lamellipodin/RAPH1, RNAi knockdown\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct imaging of RAPH1 redistribution upon supervillin perturbation in living cells, single lab\",\n      \"pmids\": [\"19109420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Lamellipodin (Raph1), a paralogue of RIAM, compensates for RIAM deficiency in regulatory T cells (Tregs) to support integrin activation (αLβ2, α4β1, α4β7) and Treg homing to gut-associated lymphoid tissue, whereas conventional T cells depend on RIAM and not lamellipodin for integrin activation.\",\n      \"method\": \"Apbb1ip-/- (RIAM-null) mouse model, Raph1 genetic comparison, integrin activation assays, in vivo homing experiments in IBD colitis model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse model with specific functional readouts (integrin activation, homing, colitis protection), multiple orthogonal in vivo and ex vivo assays\",\n      \"pmids\": [\"33104169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Lamellipodin (RAPH1) is present in lamellipodia-like structures (LLS) that form independently of WAVE regulatory complex (WRC), identifying RAPH1 as a lamellipodial component in a WRC-independent Rac/Cdc42-driven Arp2/3-dependent actin remodeling pathway. Unlike Ena/VASP proteins, RAPH1 was recruited to these LLS.\",\n      \"method\": \"Genome editing (Nap1/Hem1 double knockout) in B16-F1 melanoma cells, immunofluorescence localization of RAPH1 in LLS, growth factor and active GTPase stimulation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic ablation of WRC with direct imaging of RAPH1 localization, single lab, two orthogonal genetic perturbations\",\n      \"pmids\": [\"35971979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Raph1 (lamellipodin) is a novel substrate of NDR1/2 kinases; NDR1/2 phosphorylate Raph1, and both NDR1/2 and Raph1 are critical for endocytosis and membrane recycling in neurons. Loss of NDR1/2 leads to mislocalization and dysfunction consistent with impaired Raph1-dependent endocytic trafficking.\",\n      \"method\": \"Phosphoproteomics of Ndr1/2 knockout mouse brain, biochemical validation of Raph1 as NDR substrate, endocytosis and membrane recycling assays in knockout neurons\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomics plus functional validation in knockout model, single lab, two orthogonal approaches (MS and cell biology assays)\",\n      \"pmids\": [\"36446521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Lamellipodin (RAPH1) expression is upregulated by increased extracellular matrix (ECM) stiffness via an integrin-dependent FAK-Cas-Rac signaling module. Lamellipodin overexpression increased stiffness-induced cyclin expression, cell proliferation, and intracellular stiffness, while lamellipodin knockdown reduced these responses in mouse embryonic fibroblasts.\",\n      \"method\": \"ECM stiffness manipulation, lamellipodin overexpression and siRNA knockdown, cyclin western blots, atomic force microscopy for intracellular stiffness, proliferation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional (overexpression and knockdown) perturbations with multiple functional readouts in a single lab study\",\n      \"pmids\": [\"34152388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A nuclear isoform of RAPH1 (RAPH1-i3) interacts with the transcription factor FOXQ1, as identified by co-immunoprecipitation and mass spectrometry. Co-expression of RAPH1-i3 and FOXQ1 activated STAT3 signaling and increased expression of CCND1, MCL1, Bcl-XL, and MMP2, promoting cell proliferation, migration, and radioresistance in triple-negative breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, RAPH1-i3 overexpression and depletion, in vitro and in vivo radioresistance assays, western blot for downstream effectors\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with MS identification plus functional rescue experiments, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"38062011\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RAPH1 (lamellipodin) is a PI(3,4)P2-binding PH-domain protein that localizes to lamellipodia and acts downstream of PI3K/Rap1 signaling to regulate actin dynamics, cell migration, and integrin activation; its proline-rich domain assembles butyrylcholinesterase tetramers via direct polyproline–tetramerization domain interaction; it is phosphorylated by NDR1/2 kinases to support endocytosis and membrane recycling in neurons; ECM stiffness induces its expression via integrin–FAK–Cas–Rac signaling to drive cyclin expression and proliferation; and a nuclear isoform (RAPH1-i3) interacts with FOXQ1 to activate STAT3 signaling and confer radioresistance in breast cancer.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAPH1 (lamellipodin) is a PI(3,4)P2-binding effector that couples class I PI3K/SHIP-generated phosphoinositide signaling to actin-based cell migration [#3]. It localizes to lamellipodia and lamellipodia-like structures, where it functions as a component of Arp2/3-dependent actin remodeling that can proceed independently of the WAVE regulatory complex in a Rac/Cdc42-driven pathway [#6]; its peripheral distribution is dynamically controlled, as supervillin overexpression redistributes RAPH1 from the cell edge toward internal podosome/invadopodial sites [#4]. As a paralogue of RIAM, RAPH1 supports integrin activation and homing selectively in regulatory T cells, compensating for RIAM deficiency [#5], and its expression is induced by ECM stiffness through an integrin-FAK-Cas-Rac module to drive cyclin expression and proliferation [#8]. RAPH1 is phosphorylated by NDR1/2 kinases to support endocytosis and membrane recycling in neurons [#7]. Independently of its actin-regulatory role, the proline-rich region encoded by the terminal RAPH1 exon assembles butyrylcholinesterase into 340 kDa tetramers via direct interaction with the BChE tetramerization domain, defining RAPH1 as the CHE2 locus underlying the BChE C5 variant [#0, #1, #2]. A nuclear isoform, RAPH1-i3, interacts with FOXQ1 to activate STAT3 signaling and confer proliferation, migration, and radioresistance in triple-negative breast cancer [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established an unexpected non-cytoskeletal function for RAPH1: its proline-rich peptides organize the catalytic subunits of butyrylcholinesterase into tetramers, explaining how a secreted enzyme acquires its mature oligomeric state.\",\n      \"evidence\": \"HPLC/MS peptide sequencing and CHO cell reconstitution of BChE tetramer assembly with a 17-residue proline-rich peptide\",\n      \"pmids\": [\"18076380\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define the stoichiometry or affinity of the polyproline-tetramerization domain interaction in vivo\", \"Does not connect this assembly function to RAPH1's actin-regulatory roles\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed RAPH1 in the lamellipodial actin machinery and showed its localization is regulated, with supervillin redirecting it from the cell periphery to invadopodial sites.\",\n      \"evidence\": \"Fluorescence microscopy, immunolocalization of endogenous RAPH1, and RNAi in cultured cells overexpressing EGFP-supervillin\",\n      \"pmids\": [\"19109420\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which supervillin redistributes RAPH1 is not defined\", \"Functional consequence of relocalization for invadopodia is correlative\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the phosphoinositide specificity that places RAPH1 downstream of PI3K signaling, identifying it as a PI(3,4)P2-selective effector linking lipid signals to migration.\",\n      \"evidence\": \"Review summarizing PH-domain lipid-binding assays for PI(3,4)P2 selectivity downstream of class I PI3K and SHIP\",\n      \"pmids\": [\"26022180\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Primary binding data are summarized rather than generated here\", \"Does not establish in vivo membrane recruitment kinetics\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Confirmed genetically that the RAPH1 gene is the CHE2 locus controlling the BChE C5 phenotype, linking specific haplotypes to C5 presence and BChE activity.\",\n      \"evidence\": \"SNP genotyping and haplotype association analysis in 126 individuals stratified by C5 phenotype\",\n      \"pmids\": [\"27346732\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Association is correlative without functional dissection of individual SNPs\", \"Does not explain how haplotype affects fragment processing\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified the molecular basis of the BChE C5 variant as a noncovalently bound ~60 kDa fragment encoded by the terminal RAPH1 exon, and showed it is normally shortened during maturation.\",\n      \"evidence\": \"Western blot with C-terminus-specific anti-lamellipodin antibody, native PAGE, and MS of the C5 band\",\n      \"pmids\": [\"28661448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The 60 kDa fragment was not reconstituted or mutagenized\", \"Mechanism and protease responsible for maturation shortening unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated a cell-type-specific integrin-regulatory role: RAPH1 substitutes for its paralogue RIAM in regulatory T cells to activate integrins and drive gut homing.\",\n      \"evidence\": \"Apbb1ip-/- (RIAM-null) mouse with Raph1 genetic comparison, integrin activation assays, and in vivo homing in a colitis model\",\n      \"pmids\": [\"33104169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why Tregs but not conventional T cells rely on RAPH1 is unresolved\", \"Direct interaction with integrin activation machinery not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected mechanotransduction to RAPH1 expression, showing ECM stiffness induces RAPH1 via integrin-FAK-Cas-Rac to promote cyclin expression and proliferation.\",\n      \"evidence\": \"ECM stiffness manipulation with RAPH1 overexpression/siRNA, cyclin western blots, AFM stiffness measurement, and proliferation assays in MEFs\",\n      \"pmids\": [\"34152388\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcriptional mechanism of stiffness-induced RAPH1 expression unknown\", \"Single cell-type study\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified RAPH1 as an NDR1/2 kinase substrate required for neuronal endocytosis and membrane recycling, extending its function to membrane trafficking.\",\n      \"evidence\": \"Phosphoproteomics of Ndr1/2 knockout mouse brain, biochemical substrate validation, and endocytosis/recycling assays in knockout neurons\",\n      \"pmids\": [\"36446521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphosites and their functional impact on RAPH1 not fully mapped\", \"Direct role of RAPH1 phosphorylation in the trafficking defect not isolated from NDR1/2 loss\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Refined RAPH1's place in actin remodeling by showing it is recruited to lamellipodia-like structures that form without the WAVE regulatory complex, distinguishing it from Ena/VASP proteins.\",\n      \"evidence\": \"Nap1/Hem1 double-knockout B16-F1 cells with immunofluorescence localization of RAPH1 and GTPase/growth-factor stimulation\",\n      \"pmids\": [\"35971979\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recruitment mechanism to WRC-independent structures not defined\", \"Functional requirement of RAPH1 for these structures not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a nuclear function for a RAPH1 isoform: RAPH1-i3 binds FOXQ1 to activate STAT3 and drive proliferation, migration, and radioresistance in breast cancer.\",\n      \"evidence\": \"Co-IP/MS identification of FOXQ1, RAPH1-i3 overexpression/depletion, downstream effector westerns, and in vitro/in vivo radioresistance assays\",\n      \"pmids\": [\"38062011\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a nuclear isoform arises and localizes is not defined\", \"Mechanism by which the FOXQ1 complex activates STAT3 not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RAPH1's distinct activities — PI(3,4)P2-dependent lamellipodial actin regulation, integrin activation, membrane trafficking, BChE tetramerization, and the nuclear FOXQ1/STAT3 axis — are partitioned across isoforms and cell types remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model relating domains to the separate functions\", \"Isoform-specific functional assignment incomplete\", \"No structural data on RAPH1 complexes\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\"butyrylcholinesterase tetramer\"],\n    \"partners\": [\"BCHE\", \"FOXQ1\", \"SVIL\", \"STK38\", \"STK38L\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}