{"gene":"RIN2","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2006,"finding":"RIN2 acts as a Rab5 GEF downstream of Ras: HGF activates Ras, which binds RIN2 (a protein containing Vps9p-like GEF and Ras-association domains), activating it to exchange GDP for GTP on Rab5, thereby inducing endocytosis of E-cadherin at adherens junctions. RIN2's GEF activity toward Rab5 is required for this process, demonstrated by a cell-free endocytosis assay with AJ-enriched liver fractions and dominant-negative/GEF-dead constructs in MDCK cells.","method":"Cell-free endocytosis assay (AJ-enriched rat liver fractions), loss-of-function with GEF-dead RIN2 constructs in MDCK cells, localization at cell-cell adhesion sites","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — cell-free biochemical reconstitution of the pathway plus mutagenesis (GEF-dead) in intact cells, two orthogonal methods in a single study","pmids":["16423831"],"is_preprint":false},{"year":2012,"finding":"In endothelial cells, R-Ras-GTP binds RIN2 and converts it from a Rab5 GEF to an adaptor that preferentially binds Rab5-GTP, promoting selective endocytosis of ligand-bound/active β1 integrins and translocating R-Ras to early endosomes where the R-Ras/RIN2/Rab5 module activates Rac1 via TIAM1, driving cell adhesion and angiogenesis.","method":"Co-immunoprecipitation, GTPase binding assays, dominant-negative and constitutively-active mutants, integrin endocytosis assays, Rac1 activity assays, TIAM1 interaction studies, localization by confocal microscopy","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, GTPase state-specific binding assays, functional endocytosis readout, Rac1 activation assay; multiple orthogonal methods in single study","pmids":["22825554"],"is_preprint":false},{"year":2009,"finding":"Loss-of-function frameshift mutations in RIN2 (causing decreased RIN2 expression) result in paucity of dermal microfibrils and deficiency of fibulin-5, establishing that RIN2-mediated endocytic trafficking is required for normal elastic tissue/extracellular matrix homeogenesis in human skin.","method":"Human genetic mapping, identification of homozygous frameshift mutation, skin biopsy showing paucity of microfibrils and fibulin-5 deficiency by immunostaining/electron microscopy","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — loss-of-function human genetics with defined ultrastructural phenotype (microfibril/fibulin-5 deficiency), single family/lab","pmids":["19631308"],"is_preprint":false},{"year":2010,"finding":"A distinct homozygous 2-bp frameshift deletion in RIN2 (c.1914_1915delGC) causes nonsense-mediated mRNA decay and loss of RIN2, and is associated with abnormal collagen fibril morphology in skin and ultrastructural abnormalities in fibroblasts (dilated ER, abnormal Golgi), confirming that RIN2-dependent trafficking is required for normal connective tissue matrix assembly.","method":"Molecular analysis of RIN2 mutation, ultrastructural analysis of skin (electron microscopy), fibroblast morphology","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — human loss-of-function with ultrastructural phenotype, independent replication of RIN2 pathway role, single lab","pmids":["20424861"],"is_preprint":false},{"year":2022,"finding":"A RIN2::BRAF gene fusion found in pilocytic astrocytoma encodes a chimeric protein retaining RIN2's SH2 dimerization domain fused to the intact BRAF kinase domain, consistent with oncogenic kinase activation via constitutive dimerization.","method":"Genomic sequencing/fusion transcript identification, structural domain analysis of fusion protein","journal":"Virchows Archiv","confidence":"Low","confidence_rationale":"Tier 4 / Weak — structural inference from fusion transcript sequence only, no functional/biochemical validation of the fusion protein's activity","pmids":["36520196"],"is_preprint":false}],"current_model":"RIN2 is a Rab5 GEF that acts downstream of Ras GTPases (H-Ras and R-Ras): in its basal state it exchanges GDP for GTP on Rab5 to drive early endocytosis (e.g., of E-cadherin); upon binding R-Ras-GTP it switches to a Rab5-GTP adaptor mode that selectively internalizes active β1 integrins and routes R-Ras to early endosomes, where the R-Ras/RIN2/Rab5 complex activates Rac1 via TIAM1 to promote cell adhesion and angiogenesis, while loss of RIN2 in humans disrupts endocytic trafficking and impairs elastic tissue/connective tissue matrix homeostasis."},"narrative":{"mechanistic_narrative":"RIN2 is a Rab5 guanine nucleotide exchange factor that couples Ras-family GTPase signaling to early endocytic trafficking, governing receptor internalization and matrix homeostasis [PMID:16423831, PMID:22825554]. Containing both a Vps9p-like GEF domain and Ras-association domains, RIN2 acts downstream of activated Ras: HGF-stimulated Ras binds and activates RIN2 to catalyze GDP-to-GTP exchange on Rab5, driving endocytosis of E-cadherin from adherens junctions, a step dependent on its GEF activity [PMID:16423831]. In endothelial cells, binding of R-Ras-GTP switches RIN2 from a Rab5 GEF into a Rab5-GTP adaptor that selectively internalizes ligand-bound active β1 integrins and translocates R-Ras to early endosomes, where the R-Ras/RIN2/Rab5 module activates Rac1 through TIAM1 to promote cell adhesion and angiogenesis [PMID:22825554]. Loss-of-function frameshift mutations in humans cause depletion of RIN2 and a connective tissue disorder marked by paucity of dermal microfibrils, fibulin-5 deficiency, and abnormal collagen fibril and secretory organelle morphology, establishing RIN2-dependent trafficking as required for normal elastic and connective tissue matrix assembly [PMID:19631308, PMID:20424861].","teleology":[{"year":2006,"claim":"Established RIN2's core molecular activity by showing it is a Ras-activated Rab5 GEF that drives E-cadherin endocytosis, defining how a Ras signal is converted into an endocytic event.","evidence":"Cell-free endocytosis assay with adherens-junction-enriched liver fractions plus GEF-dead RIN2 constructs in MDCK cells","pmids":["16423831"],"confidence":"High","gaps":["Did not address whether RIN2 acts on cargoes beyond E-cadherin","Physiological signals other than HGF/Ras that engage RIN2 not defined"]},{"year":2012,"claim":"Resolved how RIN2 function is rewired by a specific Ras isoform, showing R-Ras-GTP converts it from a GEF to a Rab5-GTP adaptor that selectively traffics active β1 integrins and activates Rac1 via TIAM1.","evidence":"Reciprocal Co-IP, GTPase-state-specific binding assays, integrin endocytosis and Rac1 activity assays, confocal localization in endothelial cells","pmids":["22825554"],"confidence":"High","gaps":["Structural basis of the GEF-to-adaptor switch unresolved","How RIN2 discriminates between H-Ras and R-Ras inputs in vivo not defined"]},{"year":2009,"claim":"Connected RIN2 loss to human disease, showing frameshift mutations deplete RIN2 and cause microfibril paucity and fibulin-5 deficiency, linking endocytic trafficking to elastic matrix homeostasis.","evidence":"Human genetic mapping, homozygous frameshift identification, skin biopsy immunostaining and electron microscopy","pmids":["19631308"],"confidence":"Medium","gaps":["Single family/lab","Mechanistic link between Rab5 GEF activity and fibulin-5/microfibril assembly not established"]},{"year":2010,"claim":"Independently confirmed RIN2's matrix role with a distinct mutation, tying RIN2 loss to abnormal collagen fibrils and dilated ER/abnormal Golgi in fibroblasts.","evidence":"Molecular analysis of a 2-bp frameshift deletion causing NMD, electron microscopy of skin and fibroblasts","pmids":["20424861"],"confidence":"Medium","gaps":["Single lab","How RIN2 loss produces ER/Golgi ultrastructural defects not mechanistically traced"]},{"year":2022,"claim":"Reported a RIN2::BRAF fusion in pilocytic astrocytoma, raising the possibility that RIN2-derived dimerization domains drive oncogenic kinase activation.","evidence":"Genomic fusion transcript identification and structural domain inference","pmids":["36520196"],"confidence":"Low","gaps":["Structural inference only; no functional or biochemical validation of fusion protein activity","Contribution of RIN2 sequence to BRAF activation untested"]},{"year":null,"claim":"How RIN2's two operating modes are dynamically partitioned and what full cargo repertoire and matrix-assembly pathway connect its trafficking activity to fibulin-5/collagen homeostasis remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the GEF-to-adaptor switch","Mechanistic chain from Rab5-dependent trafficking to elastic/collagen matrix assembly undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1]}],"complexes":["R-Ras/RIN2/Rab5 module"],"partners":["RAB5","HRAS","RRAS","TIAM1","CDH1","ITGB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WYP3","full_name":"Ras and Rab interactor 2","aliases":["Ras association domain family 4","Ras inhibitor JC265","Ras interaction/interference protein 2"],"length_aa":895,"mass_kda":100.2,"function":"Ras effector protein. May function as an upstream activator and/or downstream effector for RAB5B in endocytic pathway. May function as a guanine nucleotide exchange (GEF) of RAB5B, required for activating the RAB5 proteins by exchanging bound GDP for free GTP","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8WYP3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RIN2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"STK4","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RIN2","total_profiled":1310},"omim":[{"mim_id":"618171","title":"KINESIN FAMILY MEMBER 16B; KIF16B","url":"https://www.omim.org/entry/618171"},{"mim_id":"613075","title":"MACS SYNDROME","url":"https://www.omim.org/entry/613075"},{"mim_id":"610223","title":"RAS AND RAB INTERACTOR 3; RIN3","url":"https://www.omim.org/entry/610223"},{"mim_id":"610222","title":"RAS AND RAB INTERACTOR 2; RIN2","url":"https://www.omim.org/entry/610222"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RIN2"},"hgnc":{"alias_symbol":["RASSF4"],"prev_symbol":[]},"alphafold":{"accession":"Q8WYP3","domains":[{"cath_id":"3.30.505.10","chopping":"87-214","consensus_level":"high","plddt":84.624,"start":87,"end":214},{"cath_id":"1.20.1050.80","chopping":"511-777","consensus_level":"medium","plddt":85.7939,"start":511,"end":777},{"cath_id":"3.10.20.90","chopping":"789-876","consensus_level":"high","plddt":81.1959,"start":789,"end":876}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WYP3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WYP3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WYP3-F1-predicted_aligned_error_v6.png","plddt_mean":63.28},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RIN2","jax_strain_url":"https://www.jax.org/strain/search?query=RIN2"},"sequence":{"accession":"Q8WYP3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WYP3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WYP3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WYP3"}},"corpus_meta":[{"pmid":"22825554","id":"PMC_22825554","title":"The R-Ras/RIN2/Rab5 complex controls endothelial cell adhesion and morphogenesis via active integrin endocytosis and Rac signaling.","date":"2012","source":"Cell research","url":"https://pubmed.ncbi.nlm.nih.gov/22825554","citation_count":98,"is_preprint":false},{"pmid":"16423831","id":"PMC_16423831","title":"Involvement of the Ras-Ras-activated Rab5 guanine nucleotide exchange factor RIN2-Rab5 pathway in the hepatocyte growth factor-induced endocytosis of E-cadherin.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16423831","citation_count":60,"is_preprint":false},{"pmid":"19631308","id":"PMC_19631308","title":"RIN2 deficiency results in macrocephaly, alopecia, cutis laxa, and scoliosis: MACS syndrome.","date":"2009","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19631308","citation_count":59,"is_preprint":false},{"pmid":"20424861","id":"PMC_20424861","title":"The RIN2 syndrome: a new autosomal recessive connective tissue disorder caused by deficiency of Ras and Rab interactor 2 (RIN2).","date":"2010","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20424861","citation_count":38,"is_preprint":false},{"pmid":"35287025","id":"PMC_35287025","title":"Compassionate open-label use of rituximab following a randomised clinical trial against neuromyelitis optica (RIN-2 study): B cell monitoring-based administration.","date":"2022","source":"Multiple sclerosis and related disorders","url":"https://pubmed.ncbi.nlm.nih.gov/35287025","citation_count":21,"is_preprint":false},{"pmid":"34276778","id":"PMC_34276778","title":"Novel 61-bp Indel of RIN2 Is Associated With Fat and Hatching Weight Traits in Chickens.","date":"2021","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34276778","citation_count":11,"is_preprint":false},{"pmid":"24449201","id":"PMC_24449201","title":"Newly described clinical features in two siblings with MACS syndrome and a novel mutation in RIN2.","date":"2013","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/24449201","citation_count":8,"is_preprint":false},{"pmid":"27277385","id":"PMC_27277385","title":"RIN2 syndrome: Expanding the clinical phenotype.","date":"2016","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/27277385","citation_count":8,"is_preprint":false},{"pmid":"37827343","id":"PMC_37827343","title":"NAA20 recruits Rin2 and promotes triple-negative breast cancer progression by regulating Rab5A-mediated activation of EGFR signaling.","date":"2023","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/37827343","citation_count":6,"is_preprint":false},{"pmid":"30769224","id":"PMC_30769224","title":"Leukoencephalopathy in RIN2 syndrome: Novel mutation and expansion of clinical spectrum.","date":"2019","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30769224","citation_count":4,"is_preprint":false},{"pmid":"31521835","id":"PMC_31521835","title":"RIN2 and BBS7 variants as cause of a coincidental syndrome.","date":"2019","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31521835","citation_count":3,"is_preprint":false},{"pmid":"36520196","id":"PMC_36520196","title":"Rare adult pilocytic astrocytoma of the septum pellucidum with novel RIN2::BRAF fusion.","date":"2022","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/36520196","citation_count":1,"is_preprint":false},{"pmid":"42125753","id":"PMC_42125753","title":"RIN2 reveals a novel role in regulating proliferation and early adipogenesis of chicken preadipocytes.","date":"2026","source":"Frontiers in veterinary science","url":"https://pubmed.ncbi.nlm.nih.gov/42125753","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8156,"output_tokens":1533,"usd":0.023731,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8213,"output_tokens":2204,"usd":0.048083,"stage2_stop_reason":"end_turn"},"total_usd":0.071814,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"RIN2 acts as a Rab5 GEF downstream of Ras: HGF activates Ras, which binds RIN2 (a protein containing Vps9p-like GEF and Ras-association domains), activating it to exchange GDP for GTP on Rab5, thereby inducing endocytosis of E-cadherin at adherens junctions. RIN2's GEF activity toward Rab5 is required for this process, demonstrated by a cell-free endocytosis assay with AJ-enriched liver fractions and dominant-negative/GEF-dead constructs in MDCK cells.\",\n      \"method\": \"Cell-free endocytosis assay (AJ-enriched rat liver fractions), loss-of-function with GEF-dead RIN2 constructs in MDCK cells, localization at cell-cell adhesion sites\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — cell-free biochemical reconstitution of the pathway plus mutagenesis (GEF-dead) in intact cells, two orthogonal methods in a single study\",\n      \"pmids\": [\"16423831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In endothelial cells, R-Ras-GTP binds RIN2 and converts it from a Rab5 GEF to an adaptor that preferentially binds Rab5-GTP, promoting selective endocytosis of ligand-bound/active β1 integrins and translocating R-Ras to early endosomes where the R-Ras/RIN2/Rab5 module activates Rac1 via TIAM1, driving cell adhesion and angiogenesis.\",\n      \"method\": \"Co-immunoprecipitation, GTPase binding assays, dominant-negative and constitutively-active mutants, integrin endocytosis assays, Rac1 activity assays, TIAM1 interaction studies, localization by confocal microscopy\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, GTPase state-specific binding assays, functional endocytosis readout, Rac1 activation assay; multiple orthogonal methods in single study\",\n      \"pmids\": [\"22825554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Loss-of-function frameshift mutations in RIN2 (causing decreased RIN2 expression) result in paucity of dermal microfibrils and deficiency of fibulin-5, establishing that RIN2-mediated endocytic trafficking is required for normal elastic tissue/extracellular matrix homeogenesis in human skin.\",\n      \"method\": \"Human genetic mapping, identification of homozygous frameshift mutation, skin biopsy showing paucity of microfibrils and fibulin-5 deficiency by immunostaining/electron microscopy\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — loss-of-function human genetics with defined ultrastructural phenotype (microfibril/fibulin-5 deficiency), single family/lab\",\n      \"pmids\": [\"19631308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A distinct homozygous 2-bp frameshift deletion in RIN2 (c.1914_1915delGC) causes nonsense-mediated mRNA decay and loss of RIN2, and is associated with abnormal collagen fibril morphology in skin and ultrastructural abnormalities in fibroblasts (dilated ER, abnormal Golgi), confirming that RIN2-dependent trafficking is required for normal connective tissue matrix assembly.\",\n      \"method\": \"Molecular analysis of RIN2 mutation, ultrastructural analysis of skin (electron microscopy), fibroblast morphology\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — human loss-of-function with ultrastructural phenotype, independent replication of RIN2 pathway role, single lab\",\n      \"pmids\": [\"20424861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A RIN2::BRAF gene fusion found in pilocytic astrocytoma encodes a chimeric protein retaining RIN2's SH2 dimerization domain fused to the intact BRAF kinase domain, consistent with oncogenic kinase activation via constitutive dimerization.\",\n      \"method\": \"Genomic sequencing/fusion transcript identification, structural domain analysis of fusion protein\",\n      \"journal\": \"Virchows Archiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — structural inference from fusion transcript sequence only, no functional/biochemical validation of the fusion protein's activity\",\n      \"pmids\": [\"36520196\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RIN2 is a Rab5 GEF that acts downstream of Ras GTPases (H-Ras and R-Ras): in its basal state it exchanges GDP for GTP on Rab5 to drive early endocytosis (e.g., of E-cadherin); upon binding R-Ras-GTP it switches to a Rab5-GTP adaptor mode that selectively internalizes active β1 integrins and routes R-Ras to early endosomes, where the R-Ras/RIN2/Rab5 complex activates Rac1 via TIAM1 to promote cell adhesion and angiogenesis, while loss of RIN2 in humans disrupts endocytic trafficking and impairs elastic tissue/connective tissue matrix homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RIN2 is a Rab5 guanine nucleotide exchange factor that couples Ras-family GTPase signaling to early endocytic trafficking, governing receptor internalization and matrix homeostasis [#0, #1]. Containing both a Vps9p-like GEF domain and Ras-association domains, RIN2 acts downstream of activated Ras: HGF-stimulated Ras binds and activates RIN2 to catalyze GDP-to-GTP exchange on Rab5, driving endocytosis of E-cadherin from adherens junctions, a step dependent on its GEF activity [#0]. In endothelial cells, binding of R-Ras-GTP switches RIN2 from a Rab5 GEF into a Rab5-GTP adaptor that selectively internalizes ligand-bound active \\u03b21 integrins and translocates R-Ras to early endosomes, where the R-Ras/RIN2/Rab5 module activates Rac1 through TIAM1 to promote cell adhesion and angiogenesis [#1]. Loss-of-function frameshift mutations in humans cause depletion of RIN2 and a connective tissue disorder marked by paucity of dermal microfibrils, fibulin-5 deficiency, and abnormal collagen fibril and secretory organelle morphology, establishing RIN2-dependent trafficking as required for normal elastic and connective tissue matrix assembly [#2, #3].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established RIN2's core molecular activity by showing it is a Ras-activated Rab5 GEF that drives E-cadherin endocytosis, defining how a Ras signal is converted into an endocytic event.\",\n      \"evidence\": \"Cell-free endocytosis assay with adherens-junction-enriched liver fractions plus GEF-dead RIN2 constructs in MDCK cells\",\n      \"pmids\": [\"16423831\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address whether RIN2 acts on cargoes beyond E-cadherin\", \"Physiological signals other than HGF/Ras that engage RIN2 not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved how RIN2 function is rewired by a specific Ras isoform, showing R-Ras-GTP converts it from a GEF to a Rab5-GTP adaptor that selectively traffics active \\u03b21 integrins and activates Rac1 via TIAM1.\",\n      \"evidence\": \"Reciprocal Co-IP, GTPase-state-specific binding assays, integrin endocytosis and Rac1 activity assays, confocal localization in endothelial cells\",\n      \"pmids\": [\"22825554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the GEF-to-adaptor switch unresolved\", \"How RIN2 discriminates between H-Ras and R-Ras inputs in vivo not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected RIN2 loss to human disease, showing frameshift mutations deplete RIN2 and cause microfibril paucity and fibulin-5 deficiency, linking endocytic trafficking to elastic matrix homeostasis.\",\n      \"evidence\": \"Human genetic mapping, homozygous frameshift identification, skin biopsy immunostaining and electron microscopy\",\n      \"pmids\": [\"19631308\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family/lab\", \"Mechanistic link between Rab5 GEF activity and fibulin-5/microfibril assembly not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Independently confirmed RIN2's matrix role with a distinct mutation, tying RIN2 loss to abnormal collagen fibrils and dilated ER/abnormal Golgi in fibroblasts.\",\n      \"evidence\": \"Molecular analysis of a 2-bp frameshift deletion causing NMD, electron microscopy of skin and fibroblasts\",\n      \"pmids\": [\"20424861\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"How RIN2 loss produces ER/Golgi ultrastructural defects not mechanistically traced\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Reported a RIN2::BRAF fusion in pilocytic astrocytoma, raising the possibility that RIN2-derived dimerization domains drive oncogenic kinase activation.\",\n      \"evidence\": \"Genomic fusion transcript identification and structural domain inference\",\n      \"pmids\": [\"36520196\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Structural inference only; no functional or biochemical validation of fusion protein activity\", \"Contribution of RIN2 sequence to BRAF activation untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RIN2's two operating modes are dynamically partitioned and what full cargo repertoire and matrix-assembly pathway connect its trafficking activity to fibulin-5/collagen homeostasis remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the GEF-to-adaptor switch\", \"Mechanistic chain from Rab5-dependent trafficking to elastic/collagen matrix assembly undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\"R-Ras/RIN2/Rab5 module\"],\n    \"partners\": [\"RAB5\", \"HRAS\", \"RRAS\", \"TIAM1\", \"CDH1\", \"ITGB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}