{"gene":"TCAF2","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":2015,"finding":"TCAF2 binds directly to the TRPM8 channel and promotes its trafficking to the cell surface, but exerts opposing effects on TRPM8 gating properties compared to TCAF1 — TCAF2 promotes migration of prostate cancer cells whereas TCAF1 reduces migration speed and directionality.","method":"Co-immunoprecipitation (binding), functional channel assays, cell migration assays (speed and directionality), loss-of-function experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding demonstrated, multiple orthogonal functional assays (trafficking, gating, migration), foundational paper with 83 citations","pmids":["25559186"],"is_preprint":false},{"year":2023,"finding":"In tumor pericytes, TCAF2 inhibits the expression and activity of TRPM8, leading to Wnt5a secretion, which in turn activates STAT3 signaling in tumor cells to promote epithelial-mesenchymal transition (EMT) and colorectal cancer liver metastasis.","method":"Gain- and loss-of-function experiments, pericyte-conditional Tcaf2-knockout mice, TRPM8 activity assays, Wnt5a secretion measurement, STAT3 pathway analysis, TRPM8 agonist (menthol) rescue experiments","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"High","confidence_rationale":"Tier 2 — genetic KO in vivo plus multiple mechanistic readouts (TRPM8 activity, Wnt5a, STAT3), replicated with pharmacological rescue","pmids":["37635201"],"is_preprint":false},{"year":2023,"finding":"TCAF2 promotes glioma cell migration and invasion through activation of the STAT3 signaling pathway and an EMT-like process.","method":"Transwell and scratch assays, western blotting for EMT markers and STAT3 activation, gain- and loss-of-function (knockdown/overexpression)","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, multiple functional assays but no direct binding/structural data; pathway placement via western blot","pmids":["38019450"],"is_preprint":false},{"year":2025,"finding":"PDE12 positively regulates TCAF2 expression, and the PDE12/TCAF2 axis promotes gastric cancer cell proliferation, migration, invasion, and EMT by activating the JAK2/STAT3 signaling pathway; TCAF2 knockdown reverses PDE12 overexpression phenotypes.","method":"Gain- and loss-of-function experiments, TCAF2 knockdown rescue assays, western blotting for JAK2/STAT3 pathway components, cell proliferation and migration assays","journal":"Biochimica et biophysica acta. Molecular basis of disease","confidence":"Medium","confidence_rationale":"Tier 2–3 — epistasis via rescue experiment placing TCAF2 downstream of PDE12 and upstream of JAK2/STAT3, single lab","pmids":["40628363"],"is_preprint":false}],"current_model":"TCAF2 is a TRPM8-binding protein that promotes channel trafficking to the cell surface while suppressing TRPM8 gating activity, thereby reducing intracellular Ca²⁺ signaling and driving pro-migratory/invasive cellular behavior through downstream Wnt5a secretion and JAK2/STAT3 pathway activation; it can also be transcriptionally upregulated by PDE12 to further potentiate STAT3-dependent oncogenic programs."},"narrative":{"teleology":[{"year":2015,"claim":"Establishing that TCAF2 is a direct TRPM8-binding protein that promotes channel surface trafficking yet opposes TCAF1 in gating regulation and cell migration resolved how functionally antagonistic channel modulators share the same target to produce divergent migratory outcomes.","evidence":"Co-immunoprecipitation, functional channel assays, and cell migration assays in prostate cancer cells","pmids":["25559186"],"confidence":"High","gaps":["Binding interface between TCAF2 and TRPM8 is structurally undefined","Mechanism by which TCAF2 suppresses TRPM8 gating while promoting trafficking is unknown","Whether TCAF2 affects TRPM8 independently of TCAF1 competition was not resolved"]},{"year":2023,"claim":"Demonstrating that TCAF2 in pericytes inhibits TRPM8 to drive Wnt5a secretion and paracrine STAT3-dependent EMT in colorectal cancer cells established a non-cell-autonomous mechanism linking TCAF2-TRPM8 axis to metastasis in vivo.","evidence":"Pericyte-conditional Tcaf2-knockout mice, TRPM8 activity assays, Wnt5a measurement, STAT3 pathway analysis, menthol rescue in colorectal cancer liver metastasis model","pmids":["37635201"],"confidence":"High","gaps":["How TCAF2 inhibition of TRPM8 mechanistically triggers Wnt5a secretion is not defined","Whether the pericyte-specific role generalizes to other stromal cell types is untested","Direct structural or biochemical evidence for TCAF2-induced conformational changes in TRPM8 is absent"]},{"year":2023,"claim":"Showing TCAF2 promotes glioma migration and invasion via STAT3 activation and EMT extended the STAT3-effector role of TCAF2 to a TRPM8-independent or uncharacterized context in a different cancer type.","evidence":"Transwell/scratch assays with knockdown/overexpression, western blotting for EMT markers and STAT3 phosphorylation in glioma cells","pmids":["38019450"],"confidence":"Medium","gaps":["Whether TRPM8 mediates TCAF2's effects in glioma was not tested","No direct binding partner or upstream signal for TCAF2 in glioma was identified","Single-lab study without independent replication"]},{"year":2025,"claim":"Identifying PDE12 as a positive transcriptional regulator of TCAF2 and showing epistasis over JAK2/STAT3 in gastric cancer placed TCAF2 within a defined upstream-downstream signaling hierarchy for the first time.","evidence":"TCAF2 knockdown rescue of PDE12 overexpression phenotype, western blotting for JAK2/STAT3 in gastric cancer cells","pmids":["40628363"],"confidence":"Medium","gaps":["Mechanism by which PDE12 regulates TCAF2 expression is uncharacterized","Whether JAK2/STAT3 activation by TCAF2 requires TRPM8 interaction is unknown","Single-lab study without independent replication"]},{"year":null,"claim":"The molecular mechanism by which TCAF2 modulates TRPM8 gating, the structural basis of the TCAF2-TRPM8 interaction, and the pathway connecting TCAF2 to JAK2/STAT3 activation independently of TRPM8 remain undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model or cryo-EM data for TCAF2 or the TCAF2-TRPM8 complex","Whether TCAF2 has direct enzymatic or adaptor activity beyond channel modulation is unknown","In vivo validation of the PDE12-TCAF2-JAK2/STAT3 axis is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2,3]}],"complexes":[],"partners":["TRPM8","TCAF1","PDE12"],"other_free_text":[]},"mechanistic_narrative":"TCAF2 is a TRPM8 channel-associated factor that modulates ion channel trafficking and gating to shape cellular Ca²⁺ signaling, migration, and metastatic behavior. TCAF2 binds directly to TRPM8 and promotes its surface trafficking while suppressing channel gating activity, thereby reducing intracellular Ca²⁺ signals and promoting cell migration and invasion — effects opposing those of the related factor TCAF1 [PMID:25559186]. In tumor pericytes, TCAF2-mediated inhibition of TRPM8 drives Wnt5a secretion, which activates STAT3 signaling in neighboring tumor cells to promote epithelial-mesenchymal transition and colorectal cancer liver metastasis, as demonstrated by pericyte-conditional Tcaf2-knockout mice and pharmacological TRPM8 agonist rescue [PMID:37635201]. TCAF2 also activates the JAK2/STAT3 pathway in glioma and gastric cancer cells, and its expression is positively regulated by PDE12, positioning it as a convergent effector in STAT3-dependent oncogenic programs [PMID:38019450, PMID:40628363]."},"prefetch_data":{"uniprot":{"accession":"A6NFQ2","full_name":"TRPM8 channel-associated factor 2","aliases":["TRP channel-associated factor 2"],"length_aa":919,"mass_kda":100.9,"function":"Negatively regulates the plasma membrane cation channel TRPM8 activity. Involved in the recruitment of TRPM8 to the cell surface. Promotes prostate cancer cell migration stimulation in a TRPM8-dependent manner","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/A6NFQ2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TCAF2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":77,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TCAF2","total_profiled":1310},"omim":[{"mim_id":"616252","title":"TRPM8 CHANNEL-ASSOCIATED FACTOR 2; TCAF2","url":"https://www.omim.org/entry/616252"},{"mim_id":"616251","title":"TRPM8 CHANNEL-ASSOCIATED FACTOR 1; TCAF1","url":"https://www.omim.org/entry/616251"},{"mim_id":"606678","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY M, MEMBER 8; TRPM8","url":"https://www.omim.org/entry/606678"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cell Junctions","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TCAF2"},"hgnc":{"alias_symbol":["FLJ40722","GATD9B"],"prev_symbol":["FAM139A","FAM115C"]},"alphafold":{"accession":"A6NFQ2","domains":[{"cath_id":"-","chopping":"6-189","consensus_level":"high","plddt":93.6451,"start":6,"end":189},{"cath_id":"-","chopping":"214-406","consensus_level":"high","plddt":94.4516,"start":214,"end":406},{"cath_id":"-","chopping":"419-504","consensus_level":"medium","plddt":90.5614,"start":419,"end":504},{"cath_id":"3.40.390.80","chopping":"639-764","consensus_level":"medium","plddt":95.586,"start":639,"end":764},{"cath_id":"1.10.390.30","chopping":"768-918","consensus_level":"high","plddt":95.4928,"start":768,"end":918}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/A6NFQ2","model_url":"https://alphafold.ebi.ac.uk/files/AF-A6NFQ2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-A6NFQ2-F1-predicted_aligned_error_v6.png","plddt_mean":92.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TCAF2","jax_strain_url":"https://www.jax.org/strain/search?query=TCAF2"},"sequence":{"accession":"A6NFQ2","fasta_url":"https://rest.uniprot.org/uniprotkb/A6NFQ2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/A6NFQ2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/A6NFQ2"}},"corpus_meta":[{"pmid":"25559186","id":"PMC_25559186","title":"TRP channel-associated factors are a novel protein family that regulates TRPM8 trafficking and activity.","date":"2015","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/25559186","citation_count":83,"is_preprint":false},{"pmid":"37635201","id":"PMC_37635201","title":"TCAF2 in Pericytes Promotes Colorectal Cancer Liver Metastasis via Inhibiting Cold-Sensing TRPM8 Channel.","date":"2023","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/37635201","citation_count":22,"is_preprint":false},{"pmid":"34433829","id":"PMC_34433829","title":"Evidence for opposing selective forces operating on human-specific duplicated TCAF genes in Neanderthals and humans.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34433829","citation_count":17,"is_preprint":false},{"pmid":"29167762","id":"PMC_29167762","title":"LncRNA Expression in CD4+ T Cells in Neurosyphilis Patients.","date":"2017","source":"Frontiers in cellular and infection microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/29167762","citation_count":12,"is_preprint":false},{"pmid":"32127956","id":"PMC_32127956","title":"FAM115C could be a novel tumor suppressor associated with prolonged survival in pancreatic cancer patients.","date":"2020","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/32127956","citation_count":10,"is_preprint":false},{"pmid":"36012311","id":"PMC_36012311","title":"The Association between TRP Channels Expression and Clinicopathological Characteristics of Patients with Pancreatic Adenocarcinoma.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36012311","citation_count":9,"is_preprint":false},{"pmid":"31151297","id":"PMC_31151297","title":"Identification of Proteins Differentially Expressed by Adipose-derived Mesenchymal Stem Cells Isolated from Immunodeficient Mice.","date":"2019","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31151297","citation_count":7,"is_preprint":false},{"pmid":"35641902","id":"PMC_35641902","title":"Hypoxia classifier for transcriptome datasets.","date":"2022","source":"BMC bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/35641902","citation_count":5,"is_preprint":false},{"pmid":"39446287","id":"PMC_39446287","title":"Key Genes Involved in the Beneficial Mechanism of Hyperbaric Oxygen for Glioblastoma and Predictive Indicators of Hyperbaric Oxygen Prolonging Survival in Glioblastoma Patients.","date":"2024","source":"Current medical science","url":"https://pubmed.ncbi.nlm.nih.gov/39446287","citation_count":4,"is_preprint":false},{"pmid":"38019450","id":"PMC_38019450","title":"TCAF2 drives glioma cellular migratory/invasion properties through STAT3 signaling.","date":"2023","source":"Molecular and cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38019450","citation_count":3,"is_preprint":false},{"pmid":"40628363","id":"PMC_40628363","title":"Phosphodiesterase 12 facilitates the growth and metastatic capabilities of gastric cancer cells by activating the TCAF2/JAK2/STAT3 axis.","date":"2025","source":"Biochimica et biophysica acta. Molecular basis of disease","url":"https://pubmed.ncbi.nlm.nih.gov/40628363","citation_count":0,"is_preprint":false},{"pmid":"39263936","id":"PMC_39263936","title":"When is an SNP not an SNP?","date":"2024","source":"BioTechniques","url":"https://pubmed.ncbi.nlm.nih.gov/39263936","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7468,"output_tokens":1047,"usd":0.019054},"stage2":{"model":"claude-opus-4-6","input_tokens":4256,"output_tokens":3250,"usd":0.153795},"total_usd":0.172849,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2015,\n      \"finding\": \"TCAF2 binds directly to the TRPM8 channel and promotes its trafficking to the cell surface, but exerts opposing effects on TRPM8 gating properties compared to TCAF1 — TCAF2 promotes migration of prostate cancer cells whereas TCAF1 reduces migration speed and directionality.\",\n      \"method\": \"Co-immunoprecipitation (binding), functional channel assays, cell migration assays (speed and directionality), loss-of-function experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding demonstrated, multiple orthogonal functional assays (trafficking, gating, migration), foundational paper with 83 citations\",\n      \"pmids\": [\"25559186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In tumor pericytes, TCAF2 inhibits the expression and activity of TRPM8, leading to Wnt5a secretion, which in turn activates STAT3 signaling in tumor cells to promote epithelial-mesenchymal transition (EMT) and colorectal cancer liver metastasis.\",\n      \"method\": \"Gain- and loss-of-function experiments, pericyte-conditional Tcaf2-knockout mice, TRPM8 activity assays, Wnt5a secretion measurement, STAT3 pathway analysis, TRPM8 agonist (menthol) rescue experiments\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO in vivo plus multiple mechanistic readouts (TRPM8 activity, Wnt5a, STAT3), replicated with pharmacological rescue\",\n      \"pmids\": [\"37635201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TCAF2 promotes glioma cell migration and invasion through activation of the STAT3 signaling pathway and an EMT-like process.\",\n      \"method\": \"Transwell and scratch assays, western blotting for EMT markers and STAT3 activation, gain- and loss-of-function (knockdown/overexpression)\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, multiple functional assays but no direct binding/structural data; pathway placement via western blot\",\n      \"pmids\": [\"38019450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PDE12 positively regulates TCAF2 expression, and the PDE12/TCAF2 axis promotes gastric cancer cell proliferation, migration, invasion, and EMT by activating the JAK2/STAT3 signaling pathway; TCAF2 knockdown reverses PDE12 overexpression phenotypes.\",\n      \"method\": \"Gain- and loss-of-function experiments, TCAF2 knockdown rescue assays, western blotting for JAK2/STAT3 pathway components, cell proliferation and migration assays\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular basis of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — epistasis via rescue experiment placing TCAF2 downstream of PDE12 and upstream of JAK2/STAT3, single lab\",\n      \"pmids\": [\"40628363\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TCAF2 is a TRPM8-binding protein that promotes channel trafficking to the cell surface while suppressing TRPM8 gating activity, thereby reducing intracellular Ca²⁺ signaling and driving pro-migratory/invasive cellular behavior through downstream Wnt5a secretion and JAK2/STAT3 pathway activation; it can also be transcriptionally upregulated by PDE12 to further potentiate STAT3-dependent oncogenic programs.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TCAF2 is a TRPM8 channel-associated factor that modulates ion channel trafficking and gating to shape cellular Ca²⁺ signaling, migration, and metastatic behavior. TCAF2 binds directly to TRPM8 and promotes its surface trafficking while suppressing channel gating activity, thereby reducing intracellular Ca²⁺ signals and promoting cell migration and invasion — effects opposing those of the related factor TCAF1 [PMID:25559186]. In tumor pericytes, TCAF2-mediated inhibition of TRPM8 drives Wnt5a secretion, which activates STAT3 signaling in neighboring tumor cells to promote epithelial-mesenchymal transition and colorectal cancer liver metastasis, as demonstrated by pericyte-conditional Tcaf2-knockout mice and pharmacological TRPM8 agonist rescue [PMID:37635201]. TCAF2 also activates the JAK2/STAT3 pathway in glioma and gastric cancer cells, and its expression is positively regulated by PDE12, positioning it as a convergent effector in STAT3-dependent oncogenic programs [PMID:38019450, PMID:40628363].\",\n  \"teleology\": [\n    {\n      \"year\": 2015,\n      \"claim\": \"Establishing that TCAF2 is a direct TRPM8-binding protein that promotes channel surface trafficking yet opposes TCAF1 in gating regulation and cell migration resolved how functionally antagonistic channel modulators share the same target to produce divergent migratory outcomes.\",\n      \"evidence\": \"Co-immunoprecipitation, functional channel assays, and cell migration assays in prostate cancer cells\",\n      \"pmids\": [\"25559186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Binding interface between TCAF2 and TRPM8 is structurally undefined\",\n        \"Mechanism by which TCAF2 suppresses TRPM8 gating while promoting trafficking is unknown\",\n        \"Whether TCAF2 affects TRPM8 independently of TCAF1 competition was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that TCAF2 in pericytes inhibits TRPM8 to drive Wnt5a secretion and paracrine STAT3-dependent EMT in colorectal cancer cells established a non-cell-autonomous mechanism linking TCAF2-TRPM8 axis to metastasis in vivo.\",\n      \"evidence\": \"Pericyte-conditional Tcaf2-knockout mice, TRPM8 activity assays, Wnt5a measurement, STAT3 pathway analysis, menthol rescue in colorectal cancer liver metastasis model\",\n      \"pmids\": [\"37635201\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How TCAF2 inhibition of TRPM8 mechanistically triggers Wnt5a secretion is not defined\",\n        \"Whether the pericyte-specific role generalizes to other stromal cell types is untested\",\n        \"Direct structural or biochemical evidence for TCAF2-induced conformational changes in TRPM8 is absent\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing TCAF2 promotes glioma migration and invasion via STAT3 activation and EMT extended the STAT3-effector role of TCAF2 to a TRPM8-independent or uncharacterized context in a different cancer type.\",\n      \"evidence\": \"Transwell/scratch assays with knockdown/overexpression, western blotting for EMT markers and STAT3 phosphorylation in glioma cells\",\n      \"pmids\": [\"38019450\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TRPM8 mediates TCAF2's effects in glioma was not tested\",\n        \"No direct binding partner or upstream signal for TCAF2 in glioma was identified\",\n        \"Single-lab study without independent replication\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying PDE12 as a positive transcriptional regulator of TCAF2 and showing epistasis over JAK2/STAT3 in gastric cancer placed TCAF2 within a defined upstream-downstream signaling hierarchy for the first time.\",\n      \"evidence\": \"TCAF2 knockdown rescue of PDE12 overexpression phenotype, western blotting for JAK2/STAT3 in gastric cancer cells\",\n      \"pmids\": [\"40628363\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which PDE12 regulates TCAF2 expression is uncharacterized\",\n        \"Whether JAK2/STAT3 activation by TCAF2 requires TRPM8 interaction is unknown\",\n        \"Single-lab study without independent replication\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which TCAF2 modulates TRPM8 gating, the structural basis of the TCAF2-TRPM8 interaction, and the pathway connecting TCAF2 to JAK2/STAT3 activation independently of TRPM8 remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model or cryo-EM data for TCAF2 or the TCAF2-TRPM8 complex\",\n        \"Whether TCAF2 has direct enzymatic or adaptor activity beyond channel modulation is unknown\",\n        \"In vivo validation of the PDE12-TCAF2-JAK2/STAT3 axis is lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TRPM8\",\n      \"TCAF1\",\n      \"PDE12\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to correct the pathway entry. Let me fix the duplicated/incorrect pathway term_id.\n\n```json\n{\n  \"mechanistic_narrative\": \"TCAF2 is a TRPM8 channel-associated factor that modulates ion channel trafficking and gating to shape cellular Ca²⁺ signaling, migration, and metastatic behavior. TCAF2 binds directly to TRPM8 and promotes its surface trafficking while suppressing channel gating activity, thereby reducing intracellular Ca²⁺ signals and promoting cell migration and invasion — effects opposing those of the related factor TCAF1 [PMID:25559186]. In tumor pericytes, TCAF2-mediated inhibition of TRPM8 drives Wnt5a secretion, which activates STAT3 signaling in neighboring tumor cells to promote epithelial-mesenchymal transition and colorectal cancer liver metastasis, as demonstrated by pericyte-conditional Tcaf2-knockout mice and pharmacological TRPM8 agonist rescue [PMID:37635201]. TCAF2 also activates the JAK2/STAT3 pathway in glioma and gastric cancer cells, and its expression is positively regulated by PDE12, positioning it as a convergent effector in STAT3-dependent oncogenic programs [PMID:38019450, PMID:40628363].\",\n  \"teleology\": [\n    {\n      \"year\": 2015,\n      \"claim\": \"Establishing that TCAF2 is a direct TRPM8-binding protein that promotes channel surface trafficking yet opposes TCAF1 in gating regulation and cell migration resolved how functionally antagonistic channel modulators share the same target to produce divergent migratory outcomes.\",\n      \"evidence\": \"Co-immunoprecipitation, functional channel assays, and cell migration assays in prostate cancer cells\",\n      \"pmids\": [\"25559186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Binding interface between TCAF2 and TRPM8 is structurally undefined\",\n        \"Mechanism by which TCAF2 suppresses TRPM8 gating while promoting trafficking is unknown\",\n        \"Whether TCAF2 affects TRPM8 independently of TCAF1 competition was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that TCAF2 in pericytes inhibits TRPM8 to drive Wnt5a secretion and paracrine STAT3-dependent EMT in colorectal cancer cells established a non-cell-autonomous mechanism linking the TCAF2-TRPM8 axis to metastasis in vivo.\",\n      \"evidence\": \"Pericyte-conditional Tcaf2-knockout mice, TRPM8 activity assays, Wnt5a measurement, STAT3 pathway analysis, menthol rescue in colorectal cancer liver metastasis model\",\n      \"pmids\": [\"37635201\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How TCAF2 inhibition of TRPM8 mechanistically triggers Wnt5a secretion is not defined\",\n        \"Whether the pericyte-specific role generalizes to other stromal cell types is untested\",\n        \"Direct structural or biochemical evidence for TCAF2-induced conformational changes in TRPM8 is absent\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing TCAF2 promotes glioma migration and invasion via STAT3 activation and EMT extended the STAT3-effector role of TCAF2 to a different cancer type where the involvement of TRPM8 was not assessed.\",\n      \"evidence\": \"Transwell/scratch assays with knockdown/overexpression, western blotting for EMT markers and STAT3 phosphorylation in glioma cells\",\n      \"pmids\": [\"38019450\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TRPM8 mediates TCAF2's effects in glioma was not tested\",\n        \"No direct binding partner or upstream signal for TCAF2 in glioma was identified\",\n        \"Single-lab study without independent replication\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying PDE12 as a positive transcriptional regulator of TCAF2 and showing epistasis over JAK2/STAT3 in gastric cancer placed TCAF2 within a defined upstream-downstream signaling hierarchy for the first time.\",\n      \"evidence\": \"TCAF2 knockdown rescue of PDE12 overexpression phenotype, western blotting for JAK2/STAT3 in gastric cancer cells\",\n      \"pmids\": [\"40628363\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which PDE12 regulates TCAF2 expression is uncharacterized\",\n        \"Whether JAK2/STAT3 activation by TCAF2 requires TRPM8 interaction is unknown\",\n        \"Single-lab study without independent replication\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which TCAF2 modulates TRPM8 gating, the structural basis of the TCAF2-TRPM8 interaction, and the pathway connecting TCAF2 to JAK2/STAT3 activation independently of TRPM8 remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model or cryo-EM data for TCAF2 or the TCAF2-TRPM8 complex\",\n        \"Whether TCAF2 has direct enzymatic or adaptor activity beyond channel modulation is unknown\",\n        \"In vivo validation of the PDE12-TCAF2-JAK2/STAT3 axis is lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TRPM8\",\n      \"TCAF1\",\n      \"PDE12\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}