{"gene":"HDLBP","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1993,"finding":"The HDLBP gene was localized to human chromosome 2q37 by somatic cell hybrid analysis and in situ hybridization, establishing the chromosomal locus of this HDL-binding protein.","method":"Somatic cell hybrid analysis; fluorescence in situ hybridization (FISH)","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — direct chromosomal mapping with two orthogonal methods","pmids":["8390966"],"is_preprint":false},{"year":1997,"finding":"HBP/Vigilin (HDLBP) mRNA and protein were detected in endothelial cells and foam cell macrophages of human atherosclerotic plaques by immunohistochemistry and in situ hybridization, with expression upregulated by intracellular cholesterol loading; expression co-localized with apolipoprotein E in plaque cells, suggesting a role in cholesterol metabolism in vivo.","method":"Immunohistochemistry; in situ hybridization; subcellular localization in human tissue","journal":"Arteriosclerosis, Thrombosis, and Vascular Biology","confidence":"Medium","confidence_rationale":"Tier 3 — localization and expression data in disease tissue without direct functional manipulation","pmids":["9409201"],"is_preprint":false},{"year":2009,"finding":"HDLBP (vigilin) was identified as one of three genes (alongside FARP2 and PASK) considerably downregulated in a patient with autism and 2q37.3 deletion syndrome, implicating haploinsufficiency of HDLBP in the neuropsychiatric phenotype; expression was measured in lymphoblastoid cell lines.","method":"Array comparative genomic hybridization (aCGH); FISH; RNA expression analysis in patient-derived cell lines","journal":"American Journal of Medical Genetics Part A","confidence":"Low","confidence_rationale":"Tier 3 + Weak — single patient, expression correlation without direct functional mechanism","pmids":["19365831"],"is_preprint":false},{"year":2021,"finding":"TSC2 protein physically binds to HDLBP/Vigilin, a core stress granule (SG) component, and TSC2 localizes to stress granules. Knockdown of vigilin impairs SG translocation of TSC2. TSC2-deficient cells show increased numbers of SGs after thermal shock and arsenite treatment, and genetic inhibition of G3BP1 (an SG component) suppresses proliferation of TSC2-deficient cells in vitro and in a mouse TSC model.","method":"Co-immunoprecipitation; immunofluorescence localization; siRNA knockdown; mouse tumor model","journal":"Molecular Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP with functional knockdown, but single lab study","pmids":["33888601"],"is_preprint":false},{"year":2022,"finding":"Human HDLBP/Vigilin directly interacts with more than 80% of ER-localized mRNAs via multivalent interactions with long CU-rich motifs in their coding sequences (CDS), in contrast to cytosolic mRNAs which are bound in CDS/3'UTR. PAR-CLIP analysis demonstrated these ER-localized mRNAs are high-affinity substrates. HDLBP's proximal proteome includes components of the translational apparatus and the signal recognition particle. Absence of HDLBP decreases translation efficiency of target mRNAs, impairs protein synthesis and secretion in model cell lines, and decreases tumor growth in a lung cancer mouse xenograft model.","method":"PAR-CLIP; quantitative proximal proteomics; HDLBP knockout cell lines; polysome profiling; secretion assays; in vivo mouse tumor model","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (PAR-CLIP, proteomics, KO phenotype, in vivo), single lab but highly rigorous","pmids":["35585045"],"is_preprint":false},{"year":2022,"finding":"HDLBP binds and stabilizes the long noncoding RNA lncFAL (derived from the PLXNB2 gene locus). HDLBP knockdown reduces lncFAL levels. lncFAL in turn directly binds ferroptosis suppressor protein FSP1 and competitively inhibits Trim69-dependent polyubiquitination and proteasomal degradation of FSP1, thereby reducing ferroptosis vulnerability in hepatocellular carcinoma cells. YTHDF2 promotes lncFAL splicing in an m6A-dependent manner upstream of HDLBP.","method":"RNA immunoprecipitation; knockdown/overexpression; ubiquitination assays; RNA pulldown; in vitro and in vivo ferroptosis assays","journal":"Redox Biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods but indirect role for HDLBP (acts via lncRNA stabilization); single lab","pmids":["36423520"],"is_preprint":false},{"year":2022,"finding":"HDLBP interacts with BRAF protein (identified by co-immunoprecipitation and mass spectrometry screening), promotes epithelial-mesenchymal transition (EMT) in a BRAF-dependent manner, and inhibits BRAF ubiquitinated degradation by competing with the E3 ubiquitin ligase ITCH for BRAF binding. Knockdown and overexpression of HDLBP inhibited and enhanced, respectively, HCC cell metastasis, invasion and EMT in vitro and in vivo. Cholesterol loading induces HDLBP expression.","method":"Co-immunoprecipitation; mass spectrometry; ubiquitination assay; HDLBP knockdown/overexpression; in vivo metastasis model","journal":"Cancer Letters","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP/MS identification of binding partner, functional KD/OE, ubiquitination mechanistic follow-up; single lab","pmids":["36122630"],"is_preprint":false},{"year":2022,"finding":"HDLBP interacts with RAF1 (identified by mass spectrometry screening), stabilizes RAF1 protein by competing with the TRIM71 E3 ligase for RAF1 binding, thereby preventing RAF1 ubiquitin-proteasome degradation. Stabilized RAF1 maintains MEKK1-induced RAF1-Ser259-dependent MAPK signaling. HDLBP knockdown reduces RAF1 protein levels and diminishes HCC cell proliferation and sorafenib resistance.","method":"Co-immunoprecipitation; mass spectrometry; ubiquitination assay; HDLBP knockdown/overexpression; in vivo tumor model","journal":"Cellular and Molecular Gastroenterology and Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP/MS, ubiquitination mechanism, functional assays; single lab","pmids":["36244648"],"is_preprint":false},{"year":2024,"finding":"HDLBP is characterized as a multifunctional RNA-binding protein with 14–15 KH domains, localized predominantly at the cytoplasmic face of the endoplasmic reticulum but also present in cytosol and nucleus. It is involved in translation regulation (especially of ER-targeted mRNAs), chromosome segregation, cholesterol transport, and has roles in carcinogenesis and viral infection.","method":"Literature review synthesizing PAR-CLIP, localization, and functional studies","journal":"RNA Biology","confidence":"Medium","confidence_rationale":"Tier 3 — review compiling mechanistic findings; confidence derived from underlying primary studies","pmids":["38477883"],"is_preprint":false},{"year":2025,"finding":"HDLBP binds to GJB2 mRNA (confirmed by RNA immunoprecipitation) and stabilizes it, leading to increased GJB2 expression. HDLBP overexpression enhances glycolysis (glucose uptake, lactate production, ECAR) and promotes CD8+ T cell exhaustion in lung adenocarcinoma cells; these effects are abrogated by GJB2 knockdown. In vivo mouse allograft experiments validated that HDLBP-driven tumorigenesis and T cell exhaustion require GJB2.","method":"RNA immunoprecipitation (RIP); gain/loss-of-function assays; CD8+ T cell co-culture; in vivo allograft mouse model; glycolysis assays","journal":"American Journal of Respiratory Cell and Molecular Biology","confidence":"Medium","confidence_rationale":"Tier 2 — RIP validation of mRNA binding, functional rescue experiments in vitro and in vivo; single lab","pmids":["40343852"],"is_preprint":false},{"year":2026,"finding":"Meta-phosphoproteomics analysis mapped two major HDLBP phosphosites, S31 and S944, which can be co-phosphorylated and are associated with distinct regulatory networks. S944 has identifiable upstream kinases. Co-regulated phosphosite networks implicate HDLBP phosphorylation in RNA metabolism, chromosome organization, nucleoplasmic transport, cell cycle regulation, apoptosis, and lipid homeostasis. Differential phosphorylation of HDLBP sites was observed across multiple cancer types.","method":"Meta-analysis of phosphoproteomics datasets; co-occurrence analysis; kinase prediction; functional enrichment analysis","journal":"International Journal of Molecular Sciences","confidence":"Low","confidence_rationale":"Tier 4 — computational meta-analysis without direct experimental validation of phosphosite function","pmids":["41828375"],"is_preprint":false}],"current_model":"HDLBP/Vigilin is a large multi-KH-domain RNA-binding protein localized primarily at the cytoplasmic face of the ER, where it binds more than 80% of ER-localized mRNAs via multivalent interactions with CU-rich coding-sequence motifs to promote their translation and protein secretion; it also stabilizes specific mRNAs (including GJB2) and lncRNAs (lncFAL), interacts with stress granule components (including TSC2/Vigilin complex), and prevents ubiquitin-proteasome-mediated degradation of oncoproteins BRAF and RAF1 by competing with E3 ligases ITCH and TRIM71, respectively, thereby driving tumor progression and therapy resistance."},"narrative":{"teleology":[{"year":1993,"claim":"Establishing the genomic locus of HDLBP on chromosome 2q37 provided the foundational map position needed for subsequent genetic and functional studies.","evidence":"Somatic cell hybrid analysis and FISH in human cells","pmids":["8390966"],"confidence":"High","gaps":["No functional characterization at this stage","No information on protein domain structure or binding partners"]},{"year":1997,"claim":"Detection of HDLBP protein in atherosclerotic plaque cells, with cholesterol-dependent upregulation, suggested an in vivo role in cholesterol metabolism beyond its initial identification as an HDL-binding protein.","evidence":"Immunohistochemistry and in situ hybridization in human atherosclerotic tissue","pmids":["9409201"],"confidence":"Medium","gaps":["Correlative expression data without loss-of-function evidence","Mechanism linking HDLBP to cholesterol handling not defined"]},{"year":2021,"claim":"Identification of TSC2 as a physical binding partner and demonstration that HDLBP recruits TSC2 to stress granules revealed a previously unknown connection between Vigilin and mTOR-related stress signaling.","evidence":"Reciprocal co-immunoprecipitation, immunofluorescence, siRNA knockdown, and mouse tumor model","pmids":["33888601"],"confidence":"Medium","gaps":["Whether HDLBP's RNA-binding activity is required for SG recruitment of TSC2 is untested","Generalizability beyond TSC2-deficient cell models unclear"]},{"year":2022,"claim":"Comprehensive PAR-CLIP and knockout studies established that HDLBP directly binds >80% of ER-localized mRNAs via CU-rich CDS motifs and is required for their efficient translation and secretion, defining its primary molecular function as an ER-associated translational enhancer.","evidence":"PAR-CLIP, HDLBP-KO cell lines, polysome profiling, secretion assays, proximal proteomics, in vivo xenograft","pmids":["35585045"],"confidence":"High","gaps":["Structural basis of multivalent KH-domain engagement with CU-rich motifs unresolved","Whether HDLBP cooperates with SRP for co-translational targeting not directly shown"]},{"year":2022,"claim":"Parallel studies revealed that HDLBP stabilizes oncoproteins BRAF and RAF1 at the protein level by competitively blocking E3 ligases ITCH and TRIM71, respectively, sustaining MAPK signaling and driving HCC metastasis and drug resistance—demonstrating a protein-level chaperone/shielding function distinct from its RNA-binding role.","evidence":"Co-IP/MS identification of BRAF and RAF1 interactions; ubiquitination assays; in vivo HCC models","pmids":["36122630","36244648"],"confidence":"Medium","gaps":["Whether RNA binding and protein stabilization functions are structurally separable is unknown","Both studies from a single lab; independent replication pending","Domain(s) of HDLBP mediating BRAF/RAF1 interaction not mapped"]},{"year":2022,"claim":"Demonstration that HDLBP binds and stabilizes lncFAL, which in turn protects FSP1 from TRIM69-mediated degradation, established an indirect route by which HDLBP suppresses ferroptosis in hepatocellular carcinoma.","evidence":"RIP, RNA pulldown, ubiquitination assays, ferroptosis assays in HCC cells","pmids":["36423520"],"confidence":"Medium","gaps":["HDLBP's role is indirect (via lncRNA stabilization); whether it binds FSP1 directly is untested","Specificity of HDLBP for lncFAL versus other lncRNAs not systematically assessed"]},{"year":2025,"claim":"Identification of GJB2 mRNA as a direct HDLBP target whose stabilization drives glycolysis and CD8+ T-cell exhaustion in lung adenocarcinoma extended the mRNA-stabilizing function to immune evasion in the tumor microenvironment.","evidence":"RIP, gain/loss-of-function, CD8+ T-cell co-culture, in vivo allograft model","pmids":["40343852"],"confidence":"Medium","gaps":["Binding site on GJB2 mRNA not mapped","Whether HDLBP-dependent GJB2 stabilization occurs via the same CU-rich motif mechanism as ER mRNAs is unknown"]},{"year":null,"claim":"Key unresolved questions include the structural basis by which 14–15 KH domains achieve multivalent mRNA engagement, whether HDLBP's RNA-binding and protein-stabilizing functions are mediated by distinct domains and can be genetically separated, and the physiological relevance of HDLBP phosphorylation at S31/S944.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of full-length HDLBP or KH-domain array","Functional validation of phosphosite roles (S31, S944) lacking","In vivo genetic models (conditional knockouts) in non-cancer contexts not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[4,5,8,9]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[4]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,6,7]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4,5,9]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,7,9]}],"complexes":[],"partners":["TSC2","BRAF","RAF1","ITCH","TRIM71"],"other_free_text":[]},"mechanistic_narrative":"HDLBP (Vigilin) is a large, multi-KH-domain RNA-binding protein that functions primarily at the cytoplasmic face of the endoplasmic reticulum, where it binds the majority of ER-localized mRNAs through multivalent recognition of CU-rich coding-sequence motifs and promotes their translation and secretion of the encoded proteins [PMID:35585045]. Beyond its central role in ER-associated translation, HDLBP stabilizes specific mRNAs—including GJB2 mRNA and the long noncoding RNA lncFAL—thereby influencing glycolysis, ferroptosis resistance, and immune evasion in cancer contexts [PMID:40343852, PMID:36423520]. HDLBP also acts as a protein stabilizer by physically engaging BRAF and RAF1, competing with the E3 ubiquitin ligases ITCH and TRIM71, respectively, to prevent their proteasomal degradation and sustain MAPK signaling, which promotes hepatocellular carcinoma metastasis and sorafenib resistance [PMID:36122630, PMID:36244648]. Additionally, HDLBP is a stress granule component that recruits TSC2 to stress granules, linking it to mTOR-related stress responses [PMID:33888601]."},"prefetch_data":{"uniprot":{"accession":"Q00341","full_name":"Vigilin","aliases":["High density lipoprotein-binding protein","HDL-binding protein"],"length_aa":1268,"mass_kda":141.4,"function":"Appears to play a role in cell sterol metabolism. It may function to protect cells from over-accumulation of cholesterol","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q00341/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HDLBP","classification":"Not Classified","n_dependent_lines":28,"n_total_lines":1208,"dependency_fraction":0.023178807947019868},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ATG13","stoichiometry":0.2},{"gene":"EMC9","stoichiometry":0.2},{"gene":"G3BP2","stoichiometry":0.2},{"gene":"PSPC1","stoichiometry":0.2},{"gene":"RACK1","stoichiometry":0.2},{"gene":"RPS16","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HDLBP","total_profiled":1310},"omim":[{"mim_id":"142695","title":"HIGH DENSITY LIPOPROTEIN-BINDING PROTEIN; HDLBP","url":"https://www.omim.org/entry/142695"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HDLBP"},"hgnc":{"alias_symbol":["HBP"],"prev_symbol":["VGL"]},"alphafold":{"accession":"Q00341","domains":[{"cath_id":"3.30.1370.10","chopping":"77-88_99-218","consensus_level":"medium","plddt":81.7298,"start":77,"end":218},{"cath_id":"3.30.1370.10","chopping":"364-435","consensus_level":"medium","plddt":80.0989,"start":364,"end":435},{"cath_id":"3.30.1370.10","chopping":"436-505","consensus_level":"medium","plddt":80.694,"start":436,"end":505},{"cath_id":"3.30.1370.10","chopping":"515-579","consensus_level":"medium","plddt":79.6592,"start":515,"end":579},{"cath_id":"3.30.1370.10","chopping":"583-645","consensus_level":"high","plddt":78.7321,"start":583,"end":645},{"cath_id":"3.30.1370.10","chopping":"668-723","consensus_level":"medium","plddt":75.1236,"start":668,"end":723},{"cath_id":"3.30.1370.10","chopping":"974-1052","consensus_level":"medium","plddt":84.4997,"start":974,"end":1052}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q00341","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q00341-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q00341-F1-predicted_aligned_error_v6.png","plddt_mean":74.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HDLBP","jax_strain_url":"https://www.jax.org/strain/search?query=HDLBP"},"sequence":{"accession":"Q00341","fasta_url":"https://rest.uniprot.org/uniprotkb/Q00341.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q00341/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q00341"}},"corpus_meta":[{"pmid":"15467096","id":"PMC_15467096","title":"The VGL-chanome: a protein superfamily specialized for electrical signaling and ionic homeostasis.","date":"2004","source":"Science's STKE : signal transduction knowledge environment","url":"https://pubmed.ncbi.nlm.nih.gov/15467096","citation_count":330,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11590435","id":"PMC_11590435","title":"Heparin-binding protein (HBP/CAP37): a missing link in neutrophil-evoked alteration of vascular permeability.","date":"2001","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11590435","citation_count":283,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18787642","id":"PMC_18787642","title":"Neutrophil primary granule proteins HBP and HNP1-3 boost bacterial phagocytosis by human and murine macrophages.","date":"2008","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/18787642","citation_count":181,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26068852","id":"PMC_26068852","title":"INNATE IMMUNITY. 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research","url":"https://pubmed.ncbi.nlm.nih.gov/15231748","citation_count":247,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50356,"output_tokens":2356,"usd":0.093204},"stage2":{"model":"claude-opus-4-6","input_tokens":5672,"output_tokens":2214,"usd":0.125565},"total_usd":0.466796,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":62126,"output_tokens":3687,"usd":0.120842},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6493,"output_tokens":2093,"usd":0.127185}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"HDLBP directly binds more than 80% of ER-localized mRNAs via multivalent interactions with long CU-rich motifs in their coding sequences (CDS), in contrast to cytosolic mRNAs which are bound in CDS/3'UTR; loss of HDLBP decreases translation efficiency of target mRNAs and impairs protein synthesis and secretion.\",\n      \"method\": \"PAR-CLIP, proximity proteomics (HDLBP-proximal proteome quantification), knockdown with translation efficiency measurement, secretion assays, in vivo tumor growth model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (PAR-CLIP, proteomics, functional KD) in a single rigorous study with in vivo validation\",\n      \"pmids\": [\"35585045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HDLBP binds to and stabilizes lncFAL (a lncRNA derived from the plexin B2 gene); lncFAL in turn binds FSP1 and competitively abolishes Trim69-dependent FSP1 polyubiquitination and degradation, thereby reducing ferroptosis vulnerability in hepatocellular carcinoma.\",\n      \"method\": \"RNA immunoprecipitation, pulldown, ubiquitination assays, overexpression/knockdown with ferroptosis assays in vitro and in vivo\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — single lab with multiple methods but indirect chain (HDLBP→lncFAL→FSP1 stabilization)\",\n      \"pmids\": [\"36423520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HDLBP interacts with BRAF (identified by co-immunoprecipitation and mass spectrometry) and inhibits BRAF ubiquitinated degradation by blocking BRAF-ITCH E3 ligase interactions, thereby promoting EMT signaling and HCC metastasis in a BRAF-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ubiquitination assay, knockdown/overexpression with invasion and EMT assays in vitro and in vivo\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — single lab, reciprocal Co-IP plus MS identification and functional follow-up with KO\",\n      \"pmids\": [\"36122630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HDLBP interacts with RAF1 (identified by mass spectrometry) and stabilizes RAF1 by competing with the TRIM71 E3 ligase, inhibiting ubiquitin-proteasome-dependent RAF1 degradation and maintaining MEKK1-induced RAF1-Ser259-dependent MAPK signaling, thus promoting HCC proliferation and sorafenib resistance.\",\n      \"method\": \"Mass spectrometry screen, co-immunoprecipitation, ubiquitination assay, knockdown/overexpression with proliferation and drug resistance assays\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — single lab, MS identification plus Co-IP and functional ubiquitination assay\",\n      \"pmids\": [\"36244648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TSC2 physically binds to HDLBP/vigilin; HDLBP is a core stress granule (SG) component and TSC2 localizes to SGs; knocking down HDLBP (vigilin) impacts SG translocation of TSC2, and TSC2-deficient cells show increased SG formation after stress.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence/localization, stress granule assembly assays, knockdown with SG phenotype quantification\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — single lab, Co-IP plus localization with functional consequence\",\n      \"pmids\": [\"33888601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The HDLBP gene was mapped to human chromosome 2q37 by somatic cell hybrid analysis and in situ hybridization.\",\n      \"method\": \"Somatic cell hybrid analysis, in situ hybridization (FISH)\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct chromosomal mapping by two orthogonal cytogenetic methods\",\n      \"pmids\": [\"8390966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"HBP/vigilin (HDLBP) protein and mRNA are expressed in endothelial cells of human coronary arteries and are upregulated in foam cell macrophages within atherosclerotic plaques, colocalizing with apolipoprotein E; expression can occur independently of apoE as shown in apoE-deficient mouse cardiac myocyte foam cells.\",\n      \"method\": \"Immunohistochemistry, in situ hybridization, apoE-knockout mouse model\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct localization by IHC/ISH with genetic model to dissect apoE dependence\",\n      \"pmids\": [\"9409201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HDLBP stabilizes GJB2 mRNA (RNA immunoprecipitation confirmed direct binding), increasing GJB2 expression, which promotes glycolysis and CD8+ T cell exhaustion in lung adenocarcinoma; GJB2 knockdown negated the pro-glycolytic and immunosuppressive effects of HDLBP overexpression.\",\n      \"method\": \"RNA immunoprecipitation (RIP), gain/loss-of-function assays, glycolysis measurements (glucose uptake, lactate production, ECAR), co-culture T cell exhaustion assay, in vivo allograft model\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — single lab with direct RIP evidence plus functional epistasis (GJB2 KD rescues HDLBP OE phenotype)\",\n      \"pmids\": [\"40343852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HDLBP (vigilin) haploinsufficiency in a patient with 2q37.3 deletion is associated with downregulated HDLBP expression in lymphoblastoid cells, implicating HDLBP in neural/skeletal differentiation processes.\",\n      \"method\": \"Array CGH, FISH, gene expression analysis of patient lymphoblastoid cell lines\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single patient, expression analysis only without direct functional mechanistic experiment\",\n      \"pmids\": [\"19365831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Meta-phosphoproteomic analysis of HDLBP identifies S31 and S944 as the most frequently detected phosphosites; co-occurrence analysis suggests coordinated regulation, and site-specific co-regulation networks implicate upstream kinases for S944; phosphorylation is proposed as a major regulatory mechanism for HDLBP functions including RNA metabolism and chromosome organization.\",\n      \"method\": \"Meta-analysis of phosphoproteomic datasets, co-occurrence analysis, kinase prediction, functional enrichment\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/meta-analysis only, no direct experimental validation of phosphosite function\",\n      \"pmids\": [\"41828375\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HDLBP (Vigilin) is a large RNA-binding protein with 14–15 KH domains that localizes primarily to the cytoplasmic face of the ER, where it binds the coding sequences of ER-targeted mRNAs via multivalent CU-rich motif interactions to promote their translation and the synthesis/secretion of transmembrane and secreted proteins; it also stabilizes specific mRNAs (e.g., GJB2, lncFAL) and interacts with protein partners including BRAF, RAF1, and TSC2/vigilin stress granule complexes, regulating their ubiquitin-mediated degradation and downstream signaling (EMT, MAPK, ferroptosis resistance) in cancer contexts.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper as KEEP (about canonical HDLBP/Vigilin protein) or EXCLUDE (alias collision, alt-locus product, or unrelated gene), then extract mechanistic discoveries.\n\n**Classification summary:**\n- KEEP: Papers about HDLBP/Vigilin (the ~110 kDa multi-KH domain RNA-binding protein, also known as high-density lipoprotein binding protein)\n- Papers about \"HBP\" meaning heparin-binding protein/CAP37/azurocidin → EXCLUDE (alias collision)\n- Papers about \"HBP\" meaning hexosamine biosynthesis pathway → EXCLUDE (alias collision)\n- Papers about \"HBP-1\" wheat transcription factors → EXCLUDE (plant symbol collision)\n- Papers about bacterial Hbp (hemoglobin protease) → EXCLUDE\n- Papers about SOUL/HBP heme-binding proteins → EXCLUDE\n- Papers about stem-loop binding protein \"HBP\" → EXCLUDE\n- Large proteomics datasets that happen to detect HDLBP → EXCLUDE unless mechanistic\n- Papers specifically about HDLBP: [7], [25(gene2pubmed)=FARP2 paper], [30], [34], [39], [43], [44], [58], [69], [83], [99]\n\n**KEPT papers:**\n- PMID 35585045 [39]: HDLBP binds ER-targeted mRNAs - mechanistic\n- PMID 33888601 [43]: TSC2 interacts with HDLBP/Vigilin and stress granules - mechanistic\n- PMID 36122630 [34]: HDLBP promotes HCC metastasis via BRAF - mechanistic\n- PMID 36244648 [44]: HDLBP stabilizes RAF1 via ubiquitin pathway - mechanistic\n- PMID 36423520 [7]: HDLBP stabilizes lncFAL - mechanistic\n- PMID 9409201 [30]: HBP/vigilin expressed in atherosclerosis, localization data\n- PMID 8390966 [58]: Chromosomal localization of HDLBP\n- PMID 38477883 [69]: Review of HDLBP functions (mechanistic summary based on corpus)\n- PMID 40343852 [83]: HDLBP stabilizes GJB2 RNA - mechanistic\n- PMID 41828375 [99]: Phosphoproteomics of HDLBP - mechanistic\n- PMID 19365831 [25 in main list]: FARP2, HDLBP, PASK downregulated - limited mechanism\n- PMID 22658674 [gene2pubmed 3]: mRNA interactome - detects HDLBP but not specifically mechanistic for HDLBP\n- PMID 22681889 [gene2pubmed 9]: mRNA-bound proteome - detects HDLBP\n- PMID 35271311 [gene2pubmed 22]: OpenCell - localization data for HDLBP\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1993,\n      \"finding\": \"The HDLBP gene was localized to human chromosome 2q37 by somatic cell hybrid analysis and in situ hybridization, establishing the chromosomal locus of this HDL-binding protein.\",\n      \"method\": \"Somatic cell hybrid analysis; fluorescence in situ hybridization (FISH)\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct chromosomal mapping with two orthogonal methods\",\n      \"pmids\": [\"8390966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"HBP/Vigilin (HDLBP) mRNA and protein were detected in endothelial cells and foam cell macrophages of human atherosclerotic plaques by immunohistochemistry and in situ hybridization, with expression upregulated by intracellular cholesterol loading; expression co-localized with apolipoprotein E in plaque cells, suggesting a role in cholesterol metabolism in vivo.\",\n      \"method\": \"Immunohistochemistry; in situ hybridization; subcellular localization in human tissue\",\n      \"journal\": \"Arteriosclerosis, Thrombosis, and Vascular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization and expression data in disease tissue without direct functional manipulation\",\n      \"pmids\": [\"9409201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HDLBP (vigilin) was identified as one of three genes (alongside FARP2 and PASK) considerably downregulated in a patient with autism and 2q37.3 deletion syndrome, implicating haploinsufficiency of HDLBP in the neuropsychiatric phenotype; expression was measured in lymphoblastoid cell lines.\",\n      \"method\": \"Array comparative genomic hybridization (aCGH); FISH; RNA expression analysis in patient-derived cell lines\",\n      \"journal\": \"American Journal of Medical Genetics Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 + Weak — single patient, expression correlation without direct functional mechanism\",\n      \"pmids\": [\"19365831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TSC2 protein physically binds to HDLBP/Vigilin, a core stress granule (SG) component, and TSC2 localizes to stress granules. Knockdown of vigilin impairs SG translocation of TSC2. TSC2-deficient cells show increased numbers of SGs after thermal shock and arsenite treatment, and genetic inhibition of G3BP1 (an SG component) suppresses proliferation of TSC2-deficient cells in vitro and in a mouse TSC model.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence localization; siRNA knockdown; mouse tumor model\",\n      \"journal\": \"Molecular Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with functional knockdown, but single lab study\",\n      \"pmids\": [\"33888601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human HDLBP/Vigilin directly interacts with more than 80% of ER-localized mRNAs via multivalent interactions with long CU-rich motifs in their coding sequences (CDS), in contrast to cytosolic mRNAs which are bound in CDS/3'UTR. PAR-CLIP analysis demonstrated these ER-localized mRNAs are high-affinity substrates. HDLBP's proximal proteome includes components of the translational apparatus and the signal recognition particle. Absence of HDLBP decreases translation efficiency of target mRNAs, impairs protein synthesis and secretion in model cell lines, and decreases tumor growth in a lung cancer mouse xenograft model.\",\n      \"method\": \"PAR-CLIP; quantitative proximal proteomics; HDLBP knockout cell lines; polysome profiling; secretion assays; in vivo mouse tumor model\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (PAR-CLIP, proteomics, KO phenotype, in vivo), single lab but highly rigorous\",\n      \"pmids\": [\"35585045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HDLBP binds and stabilizes the long noncoding RNA lncFAL (derived from the PLXNB2 gene locus). HDLBP knockdown reduces lncFAL levels. lncFAL in turn directly binds ferroptosis suppressor protein FSP1 and competitively inhibits Trim69-dependent polyubiquitination and proteasomal degradation of FSP1, thereby reducing ferroptosis vulnerability in hepatocellular carcinoma cells. YTHDF2 promotes lncFAL splicing in an m6A-dependent manner upstream of HDLBP.\",\n      \"method\": \"RNA immunoprecipitation; knockdown/overexpression; ubiquitination assays; RNA pulldown; in vitro and in vivo ferroptosis assays\",\n      \"journal\": \"Redox Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods but indirect role for HDLBP (acts via lncRNA stabilization); single lab\",\n      \"pmids\": [\"36423520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HDLBP interacts with BRAF protein (identified by co-immunoprecipitation and mass spectrometry screening), promotes epithelial-mesenchymal transition (EMT) in a BRAF-dependent manner, and inhibits BRAF ubiquitinated degradation by competing with the E3 ubiquitin ligase ITCH for BRAF binding. Knockdown and overexpression of HDLBP inhibited and enhanced, respectively, HCC cell metastasis, invasion and EMT in vitro and in vivo. Cholesterol loading induces HDLBP expression.\",\n      \"method\": \"Co-immunoprecipitation; mass spectrometry; ubiquitination assay; HDLBP knockdown/overexpression; in vivo metastasis model\",\n      \"journal\": \"Cancer Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP/MS identification of binding partner, functional KD/OE, ubiquitination mechanistic follow-up; single lab\",\n      \"pmids\": [\"36122630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HDLBP interacts with RAF1 (identified by mass spectrometry screening), stabilizes RAF1 protein by competing with the TRIM71 E3 ligase for RAF1 binding, thereby preventing RAF1 ubiquitin-proteasome degradation. Stabilized RAF1 maintains MEKK1-induced RAF1-Ser259-dependent MAPK signaling. HDLBP knockdown reduces RAF1 protein levels and diminishes HCC cell proliferation and sorafenib resistance.\",\n      \"method\": \"Co-immunoprecipitation; mass spectrometry; ubiquitination assay; HDLBP knockdown/overexpression; in vivo tumor model\",\n      \"journal\": \"Cellular and Molecular Gastroenterology and Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP/MS, ubiquitination mechanism, functional assays; single lab\",\n      \"pmids\": [\"36244648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HDLBP is characterized as a multifunctional RNA-binding protein with 14–15 KH domains, localized predominantly at the cytoplasmic face of the endoplasmic reticulum but also present in cytosol and nucleus. It is involved in translation regulation (especially of ER-targeted mRNAs), chromosome segregation, cholesterol transport, and has roles in carcinogenesis and viral infection.\",\n      \"method\": \"Literature review synthesizing PAR-CLIP, localization, and functional studies\",\n      \"journal\": \"RNA Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review compiling mechanistic findings; confidence derived from underlying primary studies\",\n      \"pmids\": [\"38477883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HDLBP binds to GJB2 mRNA (confirmed by RNA immunoprecipitation) and stabilizes it, leading to increased GJB2 expression. HDLBP overexpression enhances glycolysis (glucose uptake, lactate production, ECAR) and promotes CD8+ T cell exhaustion in lung adenocarcinoma cells; these effects are abrogated by GJB2 knockdown. In vivo mouse allograft experiments validated that HDLBP-driven tumorigenesis and T cell exhaustion require GJB2.\",\n      \"method\": \"RNA immunoprecipitation (RIP); gain/loss-of-function assays; CD8+ T cell co-culture; in vivo allograft mouse model; glycolysis assays\",\n      \"journal\": \"American Journal of Respiratory Cell and Molecular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP validation of mRNA binding, functional rescue experiments in vitro and in vivo; single lab\",\n      \"pmids\": [\"40343852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Meta-phosphoproteomics analysis mapped two major HDLBP phosphosites, S31 and S944, which can be co-phosphorylated and are associated with distinct regulatory networks. S944 has identifiable upstream kinases. Co-regulated phosphosite networks implicate HDLBP phosphorylation in RNA metabolism, chromosome organization, nucleoplasmic transport, cell cycle regulation, apoptosis, and lipid homeostasis. Differential phosphorylation of HDLBP sites was observed across multiple cancer types.\",\n      \"method\": \"Meta-analysis of phosphoproteomics datasets; co-occurrence analysis; kinase prediction; functional enrichment analysis\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational meta-analysis without direct experimental validation of phosphosite function\",\n      \"pmids\": [\"41828375\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HDLBP/Vigilin is a large multi-KH-domain RNA-binding protein localized primarily at the cytoplasmic face of the ER, where it binds more than 80% of ER-localized mRNAs via multivalent interactions with CU-rich coding-sequence motifs to promote their translation and protein secretion; it also stabilizes specific mRNAs (including GJB2) and lncRNAs (lncFAL), interacts with stress granule components (including TSC2/Vigilin complex), and prevents ubiquitin-proteasome-mediated degradation of oncoproteins BRAF and RAF1 by competing with E3 ligases ITCH and TRIM71, respectively, thereby driving tumor progression and therapy resistance.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HDLBP (Vigilin) is a multi-KH-domain RNA-binding protein that functions primarily at the endoplasmic reticulum to promote the translation and secretion of ER-targeted proteins, and additionally stabilizes specific mRNAs and protein partners to modulate signaling in cancer contexts. HDLBP binds more than 80% of ER-localized mRNAs via multivalent interactions with CU-rich motifs in their coding sequences, and its loss reduces translation efficiency and impairs protein secretion [PMID:35585045]. Beyond translational control, HDLBP stabilizes individual transcripts such as GJB2 mRNA and the lncRNA lncFAL, linking it to glycolysis-driven immunosuppression and ferroptosis resistance, respectively [PMID:40343852, PMID:36423520]. HDLBP also physically interacts with BRAF and RAF1, shielding them from E3-ligase-mediated ubiquitination and proteasomal degradation to sustain MAPK/EMT signaling in hepatocellular carcinoma [PMID:36122630, PMID:36244648], and is a core stress granule component that recruits TSC2 to stress granules [PMID:33888601].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Chromosomal mapping of HDLBP to 2q37 established its genomic position, enabling subsequent genetic and functional studies.\",\n      \"evidence\": \"Somatic cell hybrid analysis and FISH in human cells\",\n      \"pmids\": [\"8390966\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional characterization of the gene product at this stage\",\n        \"Relationship between locus and protein function unknown\"\n      ]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Detection of HDLBP/vigilin protein in endothelial cells and foam cell macrophages of atherosclerotic plaques established its expression in disease-relevant vascular cell types, independent of apolipoprotein E.\",\n      \"evidence\": \"Immunohistochemistry and in situ hybridization in human coronary arteries and apoE-knockout mouse cardiac tissue\",\n      \"pmids\": [\"9409201\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No mechanistic link between HDLBP expression and atherosclerosis progression\",\n        \"Molecular targets of HDLBP in vascular cells unidentified\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of HDLBP as a core stress granule component that physically binds TSC2 and recruits it to stress granules revealed a role in stress-responsive mRNP dynamics beyond steady-state translation.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence colocalization, and HDLBP knockdown with stress granule quantification\",\n      \"pmids\": [\"33888601\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether HDLBP recruits TSC2 directly via RNA or protein interaction is unresolved\",\n        \"Functional consequence of TSC2 stress granule localization on mTOR signaling not established\",\n        \"Single-lab observation without independent replication\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Comprehensive transcriptome-wide mapping showed HDLBP binds ER-localized mRNAs through multivalent CU-rich motif recognition in coding sequences, directly promoting their translation efficiency and protein secretion — establishing HDLBP's primary molecular function.\",\n      \"evidence\": \"PAR-CLIP, proximity proteomics, knockdown with ribosome profiling-based translation efficiency, secretion assays, and in vivo tumor xenograft\",\n      \"pmids\": [\"35585045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for multivalent CU-motif recognition by the 14–15 KH domains is unknown\",\n        \"Whether HDLBP directly contacts ribosomes or acts through adaptor proteins is unresolved\",\n        \"Contribution of individual KH domains to target selectivity not dissected\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Parallel studies revealed HDLBP stabilizes BRAF and RAF1 proteins by blocking E3-ligase access (ITCH for BRAF; TRIM71 for RAF1), sustaining MAPK signaling and promoting HCC metastasis and drug resistance — extending HDLBP function to direct protein-level regulation of kinase stability.\",\n      \"evidence\": \"Co-immunoprecipitation, mass spectrometry identification, ubiquitination assays, and gain/loss-of-function with invasion, proliferation, and sorafenib resistance readouts\",\n      \"pmids\": [\"36122630\", \"36244648\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Both findings from single laboratories; independent confirmation pending\",\n        \"Whether HDLBP-kinase interactions are RNA-dependent is unknown\",\n        \"Structural determinants mediating HDLBP competition with E3 ligases not characterized\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"HDLBP was shown to stabilize the lncRNA lncFAL, which in turn protects FSP1 from Trim69-mediated ubiquitination, linking HDLBP to ferroptosis resistance in hepatocellular carcinoma.\",\n      \"evidence\": \"RNA immunoprecipitation, pulldown, ubiquitination assays, ferroptosis assays in vitro and in vivo\",\n      \"pmids\": [\"36423520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Indirect mechanism (HDLBP→lncFAL→FSP1); direct HDLBP contribution to ferroptosis unclear\",\n        \"Single-lab finding without independent replication\",\n        \"How HDLBP selectively stabilizes lncFAL versus other lncRNAs not determined\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"HDLBP was shown to directly bind and stabilize GJB2 mRNA, increasing GJB2 protein expression and thereby promoting glycolysis and CD8+ T cell exhaustion in lung adenocarcinoma, revealing a mechanism connecting HDLBP's RNA-stabilizing activity to tumor immune evasion.\",\n      \"evidence\": \"RNA immunoprecipitation, gain/loss-of-function, glycolysis measurements, T cell co-culture, and in vivo allograft\",\n      \"pmids\": [\"40343852\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding; replication in independent cohorts needed\",\n        \"Whether HDLBP regulates GJB2 at the translational or purely stability level not distinguished\",\n        \"Broader landscape of HDLBP-stabilized mRNAs beyond GJB2 in immune evasion unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A structural understanding of how the 14–15 KH domains cooperate for multivalent RNA recognition, the regulation of HDLBP by phosphorylation (e.g., S31, S944), and whether its RNA-binding and protein-stabilizing functions are mechanistically coupled remain major open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of full-length HDLBP or multi-KH domain array available\",\n        \"Functional validation of phosphosites (S31, S944) not performed experimentally\",\n        \"Relationship between RNA-binding and protein-stabilizing activities is unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"BRAF\",\n      \"RAF1\",\n      \"TSC2\",\n      \"FSP1\",\n      \"GJB2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"HDLBP (Vigilin) is a large, multi-KH-domain RNA-binding protein that functions primarily at the cytoplasmic face of the endoplasmic reticulum, where it binds the majority of ER-localized mRNAs through multivalent recognition of CU-rich coding-sequence motifs and promotes their translation and secretion of the encoded proteins [PMID:35585045]. Beyond its central role in ER-associated translation, HDLBP stabilizes specific mRNAs—including GJB2 mRNA and the long noncoding RNA lncFAL—thereby influencing glycolysis, ferroptosis resistance, and immune evasion in cancer contexts [PMID:40343852, PMID:36423520]. HDLBP also acts as a protein stabilizer by physically engaging BRAF and RAF1, competing with the E3 ubiquitin ligases ITCH and TRIM71, respectively, to prevent their proteasomal degradation and sustain MAPK signaling, which promotes hepatocellular carcinoma metastasis and sorafenib resistance [PMID:36122630, PMID:36244648]. Additionally, HDLBP is a stress granule component that recruits TSC2 to stress granules, linking it to mTOR-related stress responses [PMID:33888601].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Establishing the genomic locus of HDLBP on chromosome 2q37 provided the foundational map position needed for subsequent genetic and functional studies.\",\n      \"evidence\": \"Somatic cell hybrid analysis and FISH in human cells\",\n      \"pmids\": [\"8390966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional characterization at this stage\", \"No information on protein domain structure or binding partners\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Detection of HDLBP protein in atherosclerotic plaque cells, with cholesterol-dependent upregulation, suggested an in vivo role in cholesterol metabolism beyond its initial identification as an HDL-binding protein.\",\n      \"evidence\": \"Immunohistochemistry and in situ hybridization in human atherosclerotic tissue\",\n      \"pmids\": [\"9409201\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative expression data without loss-of-function evidence\", \"Mechanism linking HDLBP to cholesterol handling not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of TSC2 as a physical binding partner and demonstration that HDLBP recruits TSC2 to stress granules revealed a previously unknown connection between Vigilin and mTOR-related stress signaling.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, immunofluorescence, siRNA knockdown, and mouse tumor model\",\n      \"pmids\": [\"33888601\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HDLBP's RNA-binding activity is required for SG recruitment of TSC2 is untested\", \"Generalizability beyond TSC2-deficient cell models unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Comprehensive PAR-CLIP and knockout studies established that HDLBP directly binds >80% of ER-localized mRNAs via CU-rich CDS motifs and is required for their efficient translation and secretion, defining its primary molecular function as an ER-associated translational enhancer.\",\n      \"evidence\": \"PAR-CLIP, HDLBP-KO cell lines, polysome profiling, secretion assays, proximal proteomics, in vivo xenograft\",\n      \"pmids\": [\"35585045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of multivalent KH-domain engagement with CU-rich motifs unresolved\", \"Whether HDLBP cooperates with SRP for co-translational targeting not directly shown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Parallel studies revealed that HDLBP stabilizes oncoproteins BRAF and RAF1 at the protein level by competitively blocking E3 ligases ITCH and TRIM71, respectively, sustaining MAPK signaling and driving HCC metastasis and drug resistance—demonstrating a protein-level chaperone/shielding function distinct from its RNA-binding role.\",\n      \"evidence\": \"Co-IP/MS identification of BRAF and RAF1 interactions; ubiquitination assays; in vivo HCC models\",\n      \"pmids\": [\"36122630\", \"36244648\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RNA binding and protein stabilization functions are structurally separable is unknown\", \"Both studies from a single lab; independent replication pending\", \"Domain(s) of HDLBP mediating BRAF/RAF1 interaction not mapped\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstration that HDLBP binds and stabilizes lncFAL, which in turn protects FSP1 from TRIM69-mediated degradation, established an indirect route by which HDLBP suppresses ferroptosis in hepatocellular carcinoma.\",\n      \"evidence\": \"RIP, RNA pulldown, ubiquitination assays, ferroptosis assays in HCC cells\",\n      \"pmids\": [\"36423520\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"HDLBP's role is indirect (via lncRNA stabilization); whether it binds FSP1 directly is untested\", \"Specificity of HDLBP for lncFAL versus other lncRNAs not systematically assessed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of GJB2 mRNA as a direct HDLBP target whose stabilization drives glycolysis and CD8+ T-cell exhaustion in lung adenocarcinoma extended the mRNA-stabilizing function to immune evasion in the tumor microenvironment.\",\n      \"evidence\": \"RIP, gain/loss-of-function, CD8+ T-cell co-culture, in vivo allograft model\",\n      \"pmids\": [\"40343852\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding site on GJB2 mRNA not mapped\", \"Whether HDLBP-dependent GJB2 stabilization occurs via the same CU-rich motif mechanism as ER mRNAs is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis by which 14–15 KH domains achieve multivalent mRNA engagement, whether HDLBP's RNA-binding and protein-stabilizing functions are mediated by distinct domains and can be genetically separated, and the physiological relevance of HDLBP phosphorylation at S31/S944.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of full-length HDLBP or KH-domain array\", \"Functional validation of phosphosite roles (S31, S944) lacking\", \"In vivo genetic models (conditional knockouts) in non-cancer contexts not reported\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4, 5, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 6, 7]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4, 5, 9]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 7, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TSC2\", \"BRAF\", \"RAF1\", \"ITCH\", \"TRIM71\"],\n    \"other_free_text\": []\n  }\n}\n```"}