{"gene":"LGALS4","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1997,"finding":"Human galectin-4 was cloned and identified as a 323-amino-acid protein with two carbohydrate recognition domains, orthologous to rat and porcine galectin-4 (~76–79% amino acid identity). Its mRNA expression was found to be restricted to the small intestine, colon, and rectum.","method":"cDNA cloning, sequencing, and Northern blot tissue distribution analysis","journal":"European Journal of Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct molecular cloning and sequencing with tissue distribution validation, single lab","pmids":["9310382"],"is_preprint":false},{"year":1997,"finding":"Galectin-4 and galectin-3 display strikingly different subcellular localizations in human colon adenocarcinoma T84 cells: galectin-4 is predominantly cytosolic and concentrated at the basal membrane in confluent cells and at the leading edge of lamellipodia in subconfluent cells, consistent with a role in cell adhesion. Immobilized recombinant galectin-4 stimulated T84 cell adhesion.","method":"Immunofluorescence microscopy, cell fractionation, cell adhesion assay with immobilized recombinant protein","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct localization experiments with functional adhesion assay, single lab","pmids":["9162064"],"is_preprint":false},{"year":2002,"finding":"Recombinant human galectin-4 shows high-affinity binding (Kd ~3.4 × 10⁻⁶ M) to SO₃⁻→3Galβ1→3GalNAc pyranoside (3-O-sulfated core 1), two orders of magnitude tighter than to core 1 alone, while having weak affinity to lactose, type 1, and type 2 oligosaccharides. 3'-Sialylated core 1 had very weak affinity, demonstrating that sulfation rather than sialylation at the 3' position is critical for high-affinity recognition.","method":"Surface plasmon resonance, galectin-Sepharose column chromatography, competitive inhibition assay","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding assays with quantitative Kd determination using multiple orthogonal methods","pmids":["11971864"],"is_preprint":false},{"year":2004,"finding":"Galectin-4 binds specifically to sulfated glycosphingolipids (SB1a, SM3, SM4s, SB2, SM2a, GM1) carrying 3-O-sulfated Gal residues but not to sialylated glycosphingolipids. On the surface of human colon adenocarcinoma cells (CCK-81 and LS174T), galectin-4 co-localizes with SB1a, GM1, and carcinoembryonic antigen (CEA) in cell-surface patches distinct from caveolin. CEA co-immunoprecipitated with galectin-4 from LS174T cell lysates (Kd ~2 × 10⁻⁸ M). Immobilized galectin-4 promoted cell adhesion through SB1a.","method":"ELISA, surface plasmon resonance, confocal immunocytochemistry, co-immunoprecipitation, cell adhesion assay","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal binding methods plus co-IP confirming CEA as a binding partner, functional adhesion assay","pmids":["15546874"],"is_preprint":false},{"year":2005,"finding":"Galectin-4 is a major component of detergent-resistant membranes (DRMs/lipid rafts) in polarized HT-29 5M12 cells and is present in post-Golgi carrier vesicles. RNAi-mediated depletion of galectin-4 causes intracellular accumulation of apical membrane markers without affecting basolateral markers, and alters the DRM-association of apical proteins. Sulfatides with long-chain hydroxylated fatty acids were identified as high-affinity ligands for galectin-4, implicating galectin-4–sulfatide interaction in lipid raft clustering for apical delivery.","method":"Retrovirus-mediated RNAi knockdown, detergent-resistant membrane fractionation, immunofluorescence, ligand identification by mass spectrometry and binding assays","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 — clean KD with specific apical trafficking phenotype, DRM biochemistry, and ligand identification by multiple methods","pmids":["15883199"],"is_preprint":false},{"year":2006,"finding":"Human galectin-4 induces phosphatidylserine (PS) exposure on the outer leaflet of activated (but not resting) human neutrophils and several leukocyte cell lines in a carbohydrate-dependent manner, without causing apoptosis. Galectin-4 binds well to activated T lymphocytes but does not induce PS exposure or apoptosis in T cells, demonstrating cell-type specificity.","method":"Flow cytometry (annexin V staining for PS exposure), cell viability assays, carbohydrate inhibition experiments","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 — functional assay with carbohydrate-dependence control and multiple cell types tested","pmids":["16940423"],"is_preprint":false},{"year":2007,"finding":"Galectin-4 binds to cholesterol 3-sulfate, a ligand lacking a β-galactoside moiety — a unique property within the galectin family. Site-directed mutagenesis (R45A) abolishes this binding, identifying Arg45 as essential for cholesterol 3-sulfate recognition. Galectin-4 exists partially as dimers, and this multivalency enhances avidity for cholesterol 3-sulfate. Cholesterol 3-sulfate co-fractionates with galectin-4 in detergent-insoluble fractions of porcine esophagus and intestine.","method":"Site-directed mutagenesis, gel filtration, chemical cross-linking, binding assays, detergent-insoluble fraction analysis","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis identifying a critical residue plus in vitro binding assays and in vivo fractionation","pmids":["17545668"],"is_preprint":false},{"year":2009,"finding":"Galectin-4 drives raft-dependent apical trafficking of glycoproteins in enterocyte-like HT-29 cells by recruiting apical glycoproteins into detergent-resistant membranes (DRMs). In galectin-4-knockdown cells, apical glycoproteins exit the Golgi but accumulate intracellularly. DRM-associated glycoproteins are identified as galectin-4 ligands enriched in complex N-glycans. Galectin-4, synthesized on free cytoplasmic ribosomes, is externalized apically and follows an apical endocytic-recycling pathway required for the apical biosynthetic pathway.","method":"shRNA-mediated knockdown, DRM fractionation, mass spectrometry glycan analysis, immunofluorescence, endocytic recycling assays","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — KD with defined post-Golgi trafficking phenotype, DRM biochemistry, ligand identification, and mechanistic pathway placement","pmids":["19192249"],"is_preprint":false},{"year":2010,"finding":"Forced expression of galectin-4 in galectin-4-negative colorectal cancer cells induces cell cycle arrest, reduces cell migration and motility, and sensitizes cells to camptothecin-induced apoptosis. Galectin-4 knockdown increases proliferation, migration, and motility. Galectin-4 was found to associate with Wnt signaling proteins and its expression led to downregulation of Wnt signaling target genes.","method":"Forced expression and shRNA knockdown, cell proliferation assays, migration/motility assays, cell cycle analysis, apoptosis assays, co-immunoprecipitation with Wnt signaling proteins, gene expression analysis","journal":"International Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2–3 — reciprocal gain/loss of function with multiple phenotypic readouts, co-IP identifying Wnt pathway association, single lab","pmids":["21064109"],"is_preprint":false},{"year":2011,"finding":"Galectin-4 binds to human monocytes and macrophages, inhibits Salmonella-induced MHC II upregulation, induces cytokine release, inhibits monocyte migration, and potently induces monocyte (but not macrophage) apoptosis. Supernatants from macrophages co-cultured with galectin-4 significantly restrict T-cell activation, linking galectin-4-mediated innate immune regulation to adaptive immune suppression.","method":"Flow cytometry (FACS binding, MHCII, apoptosis), Transwell migration assay, phagocytosis assay, cytokine measurement, T-cell co-culture","journal":"Cellular Immunology","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple functional assays in primary cells, single lab","pmids":["21724180"],"is_preprint":false},{"year":2013,"finding":"shRNA-mediated silencing of galectin-4 in HT-29 colorectal cancer cells increases cell proliferation and activates NF-κB and STAT3 signaling with IL-6 upregulation, upregulates NF-κB target genes, and enhances in vivo xenograft tumor growth, establishing galectin-4 as a suppressor of the IL-6/NF-κB/STAT3 signaling axis.","method":"shRNA knockdown, Western blotting, qPCR array, immunofluorescence, xenograft tumor assay","journal":"Cellular Oncology","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined signaling pathway activation and in vivo validation, single lab","pmids":["23378274"],"is_preprint":false},{"year":2014,"finding":"Galectin-4 induces secretion of pro-angiogenic and pro-metastatic cytokines (G-CSF, IL-6, MCP-1, GROα) from blood vascular endothelial cells in vitro and in mice, and this galectin-induced cytokine secretion enhances endothelial cell surface adhesion molecule expression, increases cancer-endothelial adhesion, and promotes endothelial tubule formation.","method":"Cytokine array, in vitro endothelial cell treatment assays, in vivo mouse model, multiple regression analysis of patient serum","journal":"British Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2–3 — in vitro functional assays with in vivo confirmation, single lab","pmids":["24384681"],"is_preprint":false},{"year":2014,"finding":"Galectin-4 mediates basolateral-to-apical transcytosis of the transferrin receptor (TfR) in epithelial cells lacking the basolateral sorting adaptor AP-1B (RPE and kidney proximal tubule cell lines, AP-1B-knockdown MDCK cells). Mutation of the N-glycan linked to N727 of TfR or knockdown of galectin-4 inhibits TfR transcytosis to apical recycling endosomes and the apical plasma membrane, instead promoting TfR lysosomal targeting and degradation.","method":"shRNA knockdown, N-glycosylation site mutagenesis, immunofluorescence, subcellular fractionation, pulse-chase trafficking assays","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 2 — reciprocal KD and mutagenesis approaches identifying a specific N-glycan signal and galectin-4 as required mediator of transcytosis, multiple cell lines","pmids":["25179596"],"is_preprint":false},{"year":2015,"finding":"The X-ray crystal structure of the human galectin-4 C-terminal carbohydrate recognition domain (galectin-4C) was solved in complex with lactose, lactose-3'-sulfate, 2'-fucosyllactose, lacto-N-tetraose, and lacto-N-neotetraose. The structures reveal that galectin-4C recognizes sulfated saccharides without a specific amino acid contact with the sulfate group, and that the non-reducing-end galactose of lacto-N-tetraose and lacto-N-neotetraose adopt different binding orientations. Recognition of A and B blood group antigens is enabled by structural features of the extended binding site, while the 2'-fucose of blood group antigens does not interact directly with the protein.","method":"X-ray crystallography, molecular dynamics simulations","journal":"The FEBS Journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structures in complex with multiple ligands providing atomic-level mechanistic detail","pmids":["26077389"],"is_preprint":false}],"current_model":"LGALS4 (Galectin-4) is a tandem-repeat β-galactoside-binding lectin expressed predominantly in gastrointestinal epithelium that functions as an apical trafficking organizer by binding sulfatides and complex N-glycans to cluster lipid rafts/DRMs for apical delivery of glycoproteins (including mediating basolateral-to-apical transcytosis via N-glycan recognition), binds sulfated glycosphingolipids and cholesterol 3-sulfate (via Arg45) as well as CEA on the colon cell surface to promote cell adhesion, induces phosphatidylserine exposure on activated neutrophils in a carbohydrate-dependent manner, and suppresses colorectal cancer cell proliferation and migration by associating with and downregulating Wnt and IL-6/NF-κB/STAT3 signaling pathways."},"narrative":{"teleology":[{"year":1997,"claim":"Cloning of human galectin-4 established it as a two-CRD tandem-repeat lectin with expression restricted to the alimentary tract, defining the tissue context for all subsequent functional studies.","evidence":"cDNA cloning, sequencing, and Northern blot analysis of human tissues","pmids":["9310382"],"confidence":"Medium","gaps":["No functional data beyond expression pattern","Post-translational modifications uncharacterized"]},{"year":1997,"claim":"Subcellular localization studies revealed that galectin-4 concentrates at sites of cell-substrate contact and lamellipodia, and immobilized galectin-4 directly promotes epithelial cell adhesion, providing the first evidence for an adhesion-related function.","evidence":"Immunofluorescence and cell adhesion assays in T84 colon carcinoma cells","pmids":["9162064"],"confidence":"Medium","gaps":["Cell-surface receptors mediating adhesion not identified","In vivo relevance untested"]},{"year":2002,"claim":"Quantitative binding studies demonstrated that galectin-4 preferentially recognizes 3-O-sulfated glycans over unsulfated or sialylated core structures, shifting the field from generic β-galactoside binding to sulfation-dependent specificity.","evidence":"Surface plasmon resonance and competitive inhibition assays with defined saccharide ligands","pmids":["11971864"],"confidence":"High","gaps":["Which CRD (N- or C-terminal) mediates sulfated glycan preference was unknown","In vivo ligands in intestinal epithelium not confirmed"]},{"year":2004,"claim":"Identification of sulfated glycosphingolipids and CEA as galectin-4 ligands on colon cell surfaces, with co-localization in lipid microdomains, connected galectin-4's carbohydrate specificity to a concrete cell-surface organizing function.","evidence":"Co-immunoprecipitation, SPR binding, confocal microscopy, and adhesion assays in colon carcinoma cells","pmids":["15546874"],"confidence":"High","gaps":["Whether galectin-4–CEA interaction has signaling consequences was untested","Functional role of lipid microdomain organization not yet established"]},{"year":2005,"claim":"RNAi knockdown demonstrated that galectin-4 is required for apical delivery of membrane glycoproteins via lipid raft clustering, establishing it as a sorting lectin in polarized epithelial trafficking.","evidence":"Retroviral shRNA knockdown, DRM fractionation, immunofluorescence, and mass spectrometry in HT-29 5M12 enterocytic cells","pmids":["15883199"],"confidence":"High","gaps":["How galectin-4 itself is sorted to the apical pathway was unclear","Whether galectin-4 acts alone or with co-factors in raft clustering was unknown"]},{"year":2007,"claim":"Discovery that galectin-4 binds cholesterol 3-sulfate—a non-β-galactoside lipid—via Arg45, revealed an unprecedented ligand-recognition mode for galectins and expanded the range of membrane lipids galectin-4 can organize.","evidence":"Site-directed mutagenesis (R45A), gel filtration, cross-linking, and detergent-insoluble fraction analysis in porcine tissues","pmids":["17545668"],"confidence":"High","gaps":["Structural basis of cholesterol 3-sulfate recognition not resolved at atomic level","Physiological concentration of cholesterol 3-sulfate in intestinal membranes not measured"]},{"year":2009,"claim":"Mechanistic dissection showed that galectin-4 recruits apical glycoproteins bearing complex N-glycans into DRMs post-Golgi, and that galectin-4 itself follows an apical endocytic-recycling route, placing it in a self-reinforcing apical sorting circuit.","evidence":"shRNA knockdown, DRM fractionation, N-glycan mass spectrometry, and endocytic recycling assays in HT-29 cells","pmids":["19192249"],"confidence":"High","gaps":["Mechanism of galectin-4 externalization (non-classical secretion) unresolved","Whether other galectins compensate in vivo remains unknown"]},{"year":2010,"claim":"Gain- and loss-of-function experiments in colorectal cancer cells linked galectin-4 to Wnt pathway suppression, cell-cycle arrest, and reduced migration, establishing a tumor-suppressive role beyond its trafficking function.","evidence":"Forced expression and shRNA knockdown with co-IP of Wnt pathway proteins, proliferation/migration assays, and apoptosis sensitization in CRC cell lines","pmids":["21064109"],"confidence":"Medium","gaps":["Direct molecular target within the Wnt pathway not identified","Mechanism connecting lectin activity to Wnt suppression unclear"]},{"year":2011,"claim":"Galectin-4 was shown to modulate innate immunity by binding monocytes and macrophages, inducing monocyte apoptosis and cytokine release, and suppressing T-cell activation indirectly, extending its biology beyond epithelial trafficking.","evidence":"FACS binding, Transwell migration, phagocytosis, cytokine, and T-cell co-culture assays with primary human monocytes/macrophages","pmids":["21724180"],"confidence":"Medium","gaps":["Monocyte surface receptor for galectin-4 not identified","In vivo relevance in gut immune homeostasis untested"]},{"year":2013,"claim":"Silencing galectin-4 activated the IL-6/NF-κB/STAT3 signaling axis and enhanced xenograft tumor growth, confirming galectin-4 as a suppressor of pro-inflammatory oncogenic signaling in colorectal cancer.","evidence":"shRNA knockdown, Western blot and qPCR array for signaling, and xenograft model in HT-29 cells","pmids":["23378274"],"confidence":"Medium","gaps":["Whether galectin-4 directly inhibits NF-κB or acts upstream via membrane organization not distinguished","Single cell line for in vivo studies"]},{"year":2014,"claim":"Galectin-4 was identified as a mediator of basolateral-to-apical transcytosis of the transferrin receptor through recognition of a specific N-glycan (N727), with its loss diverting TfR to lysosomal degradation, revealing a glycan-dependent cargo sorting decision.","evidence":"shRNA knockdown and N-glycosylation site mutagenesis with pulse-chase trafficking in RPE, kidney, and MDCK cells","pmids":["25179596"],"confidence":"High","gaps":["Whether other cargo glycoproteins use the same N-glycan-dependent transcytosis mechanism is unknown","Structural basis of galectin-4 selectivity for N727-linked glycan not resolved"]},{"year":2015,"claim":"Crystal structures of the C-terminal CRD with multiple ligands provided atomic-level understanding of how galectin-4 accommodates sulfated, fucosylated, and blood group saccharides, revealing that sulfate recognition does not involve a direct amino acid–sulfate contact.","evidence":"X-ray crystallography of galectin-4C with lactose, lactose-3'-sulfate, 2'-fucosyllactose, lacto-N-tetraose, and lacto-N-neotetraose","pmids":["26077389"],"confidence":"High","gaps":["N-terminal CRD structures in complex with sulfated ligands not reported","No structure of full-length tandem-repeat protein available"]},{"year":null,"claim":"Key unresolved questions include the in vivo role of galectin-4 in intestinal epithelial polarity (no knockout mouse phenotype reported), the mechanism of its non-classical secretion, and whether its tumor-suppressive effects operate through lectin-mediated membrane organization or independent intracellular signaling.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No galectin-4 knockout animal model phenotype reported","Non-classical secretion mechanism unknown","Relationship between trafficking and tumor-suppressive functions unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2,3,4,6,13]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,3]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,3,4]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,7]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[7,12]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[4,7,12]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4,7,12]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,10]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,9]}],"complexes":[],"partners":["CEACAM5","TFR1"],"other_free_text":[]},"mechanistic_narrative":"Galectin-4 (LGALS4) is a tandem-repeat β-galactoside-binding lectin expressed predominantly in gastrointestinal epithelium that organizes apical membrane trafficking and modulates cell signaling and immune cell function. It clusters lipid rafts by binding sulfatides and complex N-glycans in detergent-resistant membranes, thereby directing post-Golgi apical delivery of glycoproteins in polarized enterocytes; its depletion causes intracellular accumulation of apical cargo without affecting basolateral markers, and it mediates basolateral-to-apical transcytosis of the transferrin receptor through recognition of a specific N-glycan [PMID:15883199, PMID:19192249, PMID:25179596]. Beyond trafficking, galectin-4 binds sulfated glycosphingolipids, cholesterol 3-sulfate (via Arg45), and CEA on colon cell surfaces to promote cell adhesion, and induces phosphatidylserine exposure on activated neutrophils in a carbohydrate-dependent manner [PMID:15546874, PMID:17545668, PMID:16940423]. In colorectal cancer cells, galectin-4 suppresses proliferation and migration by downregulating Wnt signaling and the IL-6/NF-κB/STAT3 axis, with its loss enhancing xenograft tumor growth [PMID:21064109, PMID:23378274]."},"prefetch_data":{"uniprot":{"accession":"P56470","full_name":"Galectin-4","aliases":["Antigen NY-CO-27","L-36 lactose-binding protein","L36LBP","Lactose-binding lectin 4"],"length_aa":323,"mass_kda":35.9,"function":"Galectin that binds lactose and a related range of sugars. May be involved in the assembly of adherens junctions","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P56470/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LGALS4","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LGALS4","total_profiled":1310},"omim":[{"mim_id":"613842","title":"GDNF-INDUCIBLE ZINC FINGER PROTEIN 1; GZF1","url":"https://www.omim.org/entry/613842"},{"mim_id":"606099","title":"LECTIN, GALACTOSIDE-BINDING, SOLUBLE, 8; LGALS8","url":"https://www.omim.org/entry/606099"},{"mim_id":"602518","title":"LECTIN, GALACTOSIDE-BINDING, SOLUBLE, 4; LGALS4","url":"https://www.omim.org/entry/602518"},{"mim_id":"600615","title":"LECTIN, GALACTOSIDE-BINDING, SOLUBLE, 7; LGALS7","url":"https://www.omim.org/entry/600615"},{"mim_id":"300670","title":"SPANX FAMILY, MEMBER D; SPANXD","url":"https://www.omim.org/entry/300670"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Plasma membrane","reliability":"Uncertain"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":1827.2}],"url":"https://www.proteinatlas.org/search/LGALS4"},"hgnc":{"alias_symbol":["GAL4"],"prev_symbol":[]},"alphafold":{"accession":"P56470","domains":[{"cath_id":"2.60.120.200","chopping":"8-149","consensus_level":"high","plddt":95.6994,"start":8,"end":149},{"cath_id":"2.60.120.200","chopping":"186-321","consensus_level":"high","plddt":95.5614,"start":186,"end":321}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P56470","model_url":"https://alphafold.ebi.ac.uk/files/AF-P56470-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P56470-F1-predicted_aligned_error_v6.png","plddt_mean":89.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LGALS4","jax_strain_url":"https://www.jax.org/strain/search?query=LGALS4"},"sequence":{"accession":"P56470","fasta_url":"https://rest.uniprot.org/uniprotkb/P56470.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P56470/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P56470"}},"corpus_meta":[{"pmid":"8016655","id":"PMC_8016655","title":"Stimulation 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Structure and function of a large family of animal lectins.","date":"1994","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/8063692","citation_count":1222,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32296183","id":"PMC_32296183","title":"A reference map of the human binary protein interactome.","date":"2020","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/32296183","citation_count":849,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17110338","id":"PMC_17110338","title":"Hsp90 cochaperone Aha1 downregulation rescues misfolding of CFTR in cystic fibrosis.","date":"2006","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/17110338","citation_count":517,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15489334","id":"PMC_15489334","title":"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).","date":"2004","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/15489334","citation_count":438,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8889549","id":"PMC_8889549","title":"Generation and analysis of 280,000 human expressed sequence tags.","date":"1996","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/8889549","citation_count":376,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15883199","id":"PMC_15883199","title":"Galectin-4 and sulfatides in apical membrane trafficking in enterocyte-like cells.","date":"2005","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15883199","citation_count":213,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25037231","id":"PMC_25037231","title":"Extracellular matrix signatures of human primary metastatic colon cancers and their metastases to liver.","date":"2014","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/25037231","citation_count":203,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16940423","id":"PMC_16940423","title":"Human galectin-1, -2, and -4 induce surface exposure of phosphatidylserine in activated human neutrophils but not in activated T cells.","date":"2006","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/16940423","citation_count":127,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19192249","id":"PMC_19192249","title":"Galectin-4-regulated delivery of glycoproteins to the brush border membrane of enterocyte-like cells.","date":"2009","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/19192249","citation_count":124,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"15546874","id":"PMC_15546874","title":"Galectin-4 binds to sulfated glycosphingolipids and carcinoembryonic antigen in patches on the cell surface of human colon adenocarcinoma cells.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15546874","citation_count":106,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21064109","id":"PMC_21064109","title":"Galectin-4 functions as a tumor suppressor of human colorectal cancer.","date":"2010","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21064109","citation_count":95,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11971864","id":"PMC_11971864","title":"High-affinity binding of recombinant human galectin-4 to SO(3)(-)-->3Galbeta1-->3GalNAc pyranoside.","date":"2002","source":"Glycobiology","url":"https://pubmed.ncbi.nlm.nih.gov/11971864","citation_count":95,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9162064","id":"PMC_9162064","title":"Strikingly different localization of galectin-3 and galectin-4 in human colon adenocarcinoma T84 cells. Galectin-4 is localized at sites of cell adhesion.","date":"1997","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9162064","citation_count":87,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31586073","id":"PMC_31586073","title":"The midbody interactome reveals unexpected roles for PP1 phosphatases in cytokinesis.","date":"2019","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/31586073","citation_count":74,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"27590897","id":"PMC_27590897","title":"Tissue- and cell-specific localization of galectins, β-galactose-binding animal lectins, and their potential functions in health and disease.","date":"2016","source":"Anatomical science international","url":"https://pubmed.ncbi.nlm.nih.gov/27590897","citation_count":73,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"9310382","id":"PMC_9310382","title":"Cloning and expression of the mRNA of human galectin-4, an S-type lectin down-regulated in colorectal cancer.","date":"1997","source":"European journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9310382","citation_count":71,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24384681","id":"PMC_24384681","title":"Circulating galectins -2, -4 and -8 in cancer patients make important contributions to the increased circulation of several cytokines and chemokines that promote angiogenesis and metastasis.","date":"2014","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/24384681","citation_count":70,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26173257","id":"PMC_26173257","title":"Assembly, organization and regulation of cell-surface receptors by lectin-glycan complexes.","date":"2015","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/26173257","citation_count":64,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25230111","id":"PMC_25230111","title":"Galectin-4 serves as a prognostic biomarker for the early recurrence / metastasis of hepatocellular carcinoma.","date":"2014","source":"Cancer science","url":"https://pubmed.ncbi.nlm.nih.gov/25230111","citation_count":58,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23378274","id":"PMC_23378274","title":"Abrogation of galectin-4 expression promotes tumorigenesis in colorectal cancer.","date":"2013","source":"Cellular oncology (Dordrecht, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/23378274","citation_count":55,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17545668","id":"PMC_17545668","title":"Recognition mechanism of galectin-4 for cholesterol 3-sulfate.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17545668","citation_count":50,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24339976","id":"PMC_24339976","title":"Galectin-4, a novel predictor for lymph node metastasis in lung adenocarcinoma.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24339976","citation_count":47,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21724180","id":"PMC_21724180","title":"Galectins distinctively regulate central monocyte and macrophage function.","date":"2011","source":"Cellular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21724180","citation_count":47,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26077389","id":"PMC_26077389","title":"Structural characterization of human galectin-4 C-terminal domain: elucidating the molecular basis for recognition of glycosphingolipids, sulfated saccharides and blood group antigens.","date":"2015","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/26077389","citation_count":43,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23117840","id":"PMC_23117840","title":"Simultaneous determination of serum galectin-3 and -4 levels detects metastases in colorectal cancer patients.","date":"2012","source":"Cellular oncology (Dordrecht, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/23117840","citation_count":34,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26891020","id":"PMC_26891020","title":"A galectin-specific signature in the gut delineates Crohn's disease and ulcerative colitis from other human inflammatory intestinal disorders.","date":"2016","source":"BioFactors (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/26891020","citation_count":33,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"25179596","id":"PMC_25179596","title":"Galectin-4-mediated transcytosis of transferrin receptor.","date":"2014","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/25179596","citation_count":32,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"31147178","id":"PMC_31147178","title":"The roles of galectin-3 and galectin-4 in the idiopatic Parkinson disease and its progression.","date":"2019","source":"Clinical neurology and neurosurgery","url":"https://pubmed.ncbi.nlm.nih.gov/31147178","citation_count":30,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":41591,"output_tokens":256,"usd":0.064307},"stage2":{"model":"","input_tokens":0,"output_tokens":0,"usd":0.0},"total_usd":0.358602,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":55791,"output_tokens":5024,"usd":0.121367},"round2_rules_fired":"R1","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7672,"output_tokens":3077,"usd":0.172928}},"stage1_raw":"Looking at the corpus, I need to identify papers about LGALS4 (Galectin-4, a human lectin protein) versus the many papers about the yeast transcription factor GAL4 (a completely different gene). The vast majority of papers here are about the yeast GAL4 transcription factor or GAL4 as a genetic tool in Drosophila/zebrafish — these are SYMBOL COLLISIONS with the human LGALS4 gene.\n\nOnly papers [70] and [89] mention LGALS4 specifically, but these are expression/biomarker studies (gene expression in colorectal cancer, oxaliplatin resistance) with no mechanistic experiments described.\n\nThere are no papers in this corpus that describe mechanistic experiments (binding partners, enzymatic activity, structure, pathway epistasis, PTMs, localization with functional consequence, or loss-of-function with defined molecular phenotype) for the human LGALS4 (Galectin-4) protein.\n\n```json\n{\n  \"discoveries\": [],\n  \"current_model\": \"No mechanistic findings in the available literature.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at the corpus, I need to classify papers:\n\n- Papers [1]-[99] in the main corpus: These are almost entirely about **yeast GAL4** (a transcription factor) or the **GAL4/UAS system** used as a genetic tool in Drosophila/zebrafish. This is a **SYMBOL COLLISION** — yeast GAL4 is a completely different protein from human **LGALS4** (Galectin-4). I must EXCLUDE all of these.\n\n- Paper [70] (PMID:32257432): Mentions LGALS4 as a biomarker in blood — expression/biomarker study, no mechanistic data → EXCLUDE (no mechanism).\n\n- Paper [89] (PMID:37535601): Mentions LGALS4 downregulation in oxaliplatin resistance — expression/correlation study → EXCLUDE.\n\n**Gene2pubmed curated papers** — these are about LGALS4 (Galectin-4):\n- PMID:16169070: Human protein interactome (Y2H screen) — mentions LGALS4 interactions but is a large-scale screen, no specific mechanistic follow-up for LGALS4.\n- PMID:12477932, 8063692, 32296183, 17110338, 15489334, 8889549: General resources, not mechanistic for LGALS4.\n- PMID:15883199: Galectin-4 and sulfatides in apical trafficking — KEEP ✓\n- PMID:25037231: ECM proteomics — mentions LGALS4 but no mechanism → EXCLUDE\n- PMID:16940423: Galectin-4 induces PS exposure in neutrophils — KEEP ✓\n- PMID:19192249: Galectin-4 regulated apical delivery of glycoproteins — KEEP ✓\n- PMID:15546874: Galectin-4 binds sulfated glycosphingolipids and CEA — KEEP ✓\n- PMID:21064109: Galectin-4 as tumor suppressor, Wnt signaling — KEEP ✓\n- PMID:11971864: Carbohydrate binding specificity of galectin-4 — KEEP ✓\n- PMID:9162064: Localization of galectin-4 in T84 cells — KEEP ✓\n- PMID:31586073: Midbody interactome — mentions galectin-4 tangentially → EXCLUDE (not mechanistic for LGALS4)\n- PMID:27590897: Review of galectin localization — no direct experiment → EXCLUDE\n- PMID:9310382: Cloning of human galectin-4 — KEEP ✓\n- PMID:24384681: Galectin-4 induces cytokine secretion from endothelial cells — KEEP ✓\n- PMID:26173257: Review — EXCLUDE\n- PMID:25230111: Galectin-4 in HCC, cell migration assays — KEEP ✓\n- PMID:23378274: Galectin-4 silencing activates NF-κB/STAT3 — KEEP ✓\n- PMID:17545668: Galectin-4 binds cholesterol 3-sulfate — KEEP ✓\n- PMID:24339976: Galectin-4 in lung adenocarcinoma metastasis — expression/IHC mostly → EXCLUDE\n- PMID:21724180: Galectin-4 modulates monocyte/macrophage function — KEEP ✓\n- PMID:26077389: Crystal structure of galectin-4 C-terminal domain — KEEP ✓\n- PMID:23117840: Serum galectin-3/-4 detection — biomarker → EXCLUDE\n- PMID:26891020: Galectin expression in IBD — expression study → EXCLUDE\n- PMID:25179596: Galectin-4-mediated transcytosis of TfR — KEEP ✓\n- PMID:31147178: Serum galectin levels in Parkinson's — biomarker → EXCLUDE\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Human galectin-4 was cloned and identified as a 323-amino-acid protein with two carbohydrate recognition domains, orthologous to rat and porcine galectin-4 (~76–79% amino acid identity). Its mRNA expression was found to be restricted to the small intestine, colon, and rectum.\",\n      \"method\": \"cDNA cloning, sequencing, and Northern blot tissue distribution analysis\",\n      \"journal\": \"European Journal of Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular cloning and sequencing with tissue distribution validation, single lab\",\n      \"pmids\": [\"9310382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Galectin-4 and galectin-3 display strikingly different subcellular localizations in human colon adenocarcinoma T84 cells: galectin-4 is predominantly cytosolic and concentrated at the basal membrane in confluent cells and at the leading edge of lamellipodia in subconfluent cells, consistent with a role in cell adhesion. Immobilized recombinant galectin-4 stimulated T84 cell adhesion.\",\n      \"method\": \"Immunofluorescence microscopy, cell fractionation, cell adhesion assay with immobilized recombinant protein\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct localization experiments with functional adhesion assay, single lab\",\n      \"pmids\": [\"9162064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Recombinant human galectin-4 shows high-affinity binding (Kd ~3.4 × 10⁻⁶ M) to SO₃⁻→3Galβ1→3GalNAc pyranoside (3-O-sulfated core 1), two orders of magnitude tighter than to core 1 alone, while having weak affinity to lactose, type 1, and type 2 oligosaccharides. 3'-Sialylated core 1 had very weak affinity, demonstrating that sulfation rather than sialylation at the 3' position is critical for high-affinity recognition.\",\n      \"method\": \"Surface plasmon resonance, galectin-Sepharose column chromatography, competitive inhibition assay\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding assays with quantitative Kd determination using multiple orthogonal methods\",\n      \"pmids\": [\"11971864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Galectin-4 binds specifically to sulfated glycosphingolipids (SB1a, SM3, SM4s, SB2, SM2a, GM1) carrying 3-O-sulfated Gal residues but not to sialylated glycosphingolipids. On the surface of human colon adenocarcinoma cells (CCK-81 and LS174T), galectin-4 co-localizes with SB1a, GM1, and carcinoembryonic antigen (CEA) in cell-surface patches distinct from caveolin. CEA co-immunoprecipitated with galectin-4 from LS174T cell lysates (Kd ~2 × 10⁻⁸ M). Immobilized galectin-4 promoted cell adhesion through SB1a.\",\n      \"method\": \"ELISA, surface plasmon resonance, confocal immunocytochemistry, co-immunoprecipitation, cell adhesion assay\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal binding methods plus co-IP confirming CEA as a binding partner, functional adhesion assay\",\n      \"pmids\": [\"15546874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Galectin-4 is a major component of detergent-resistant membranes (DRMs/lipid rafts) in polarized HT-29 5M12 cells and is present in post-Golgi carrier vesicles. RNAi-mediated depletion of galectin-4 causes intracellular accumulation of apical membrane markers without affecting basolateral markers, and alters the DRM-association of apical proteins. Sulfatides with long-chain hydroxylated fatty acids were identified as high-affinity ligands for galectin-4, implicating galectin-4–sulfatide interaction in lipid raft clustering for apical delivery.\",\n      \"method\": \"Retrovirus-mediated RNAi knockdown, detergent-resistant membrane fractionation, immunofluorescence, ligand identification by mass spectrometry and binding assays\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with specific apical trafficking phenotype, DRM biochemistry, and ligand identification by multiple methods\",\n      \"pmids\": [\"15883199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human galectin-4 induces phosphatidylserine (PS) exposure on the outer leaflet of activated (but not resting) human neutrophils and several leukocyte cell lines in a carbohydrate-dependent manner, without causing apoptosis. Galectin-4 binds well to activated T lymphocytes but does not induce PS exposure or apoptosis in T cells, demonstrating cell-type specificity.\",\n      \"method\": \"Flow cytometry (annexin V staining for PS exposure), cell viability assays, carbohydrate inhibition experiments\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional assay with carbohydrate-dependence control and multiple cell types tested\",\n      \"pmids\": [\"16940423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Galectin-4 binds to cholesterol 3-sulfate, a ligand lacking a β-galactoside moiety — a unique property within the galectin family. Site-directed mutagenesis (R45A) abolishes this binding, identifying Arg45 as essential for cholesterol 3-sulfate recognition. Galectin-4 exists partially as dimers, and this multivalency enhances avidity for cholesterol 3-sulfate. Cholesterol 3-sulfate co-fractionates with galectin-4 in detergent-insoluble fractions of porcine esophagus and intestine.\",\n      \"method\": \"Site-directed mutagenesis, gel filtration, chemical cross-linking, binding assays, detergent-insoluble fraction analysis\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis identifying a critical residue plus in vitro binding assays and in vivo fractionation\",\n      \"pmids\": [\"17545668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Galectin-4 drives raft-dependent apical trafficking of glycoproteins in enterocyte-like HT-29 cells by recruiting apical glycoproteins into detergent-resistant membranes (DRMs). In galectin-4-knockdown cells, apical glycoproteins exit the Golgi but accumulate intracellularly. DRM-associated glycoproteins are identified as galectin-4 ligands enriched in complex N-glycans. Galectin-4, synthesized on free cytoplasmic ribosomes, is externalized apically and follows an apical endocytic-recycling pathway required for the apical biosynthetic pathway.\",\n      \"method\": \"shRNA-mediated knockdown, DRM fractionation, mass spectrometry glycan analysis, immunofluorescence, endocytic recycling assays\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined post-Golgi trafficking phenotype, DRM biochemistry, ligand identification, and mechanistic pathway placement\",\n      \"pmids\": [\"19192249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Forced expression of galectin-4 in galectin-4-negative colorectal cancer cells induces cell cycle arrest, reduces cell migration and motility, and sensitizes cells to camptothecin-induced apoptosis. Galectin-4 knockdown increases proliferation, migration, and motility. Galectin-4 was found to associate with Wnt signaling proteins and its expression led to downregulation of Wnt signaling target genes.\",\n      \"method\": \"Forced expression and shRNA knockdown, cell proliferation assays, migration/motility assays, cell cycle analysis, apoptosis assays, co-immunoprecipitation with Wnt signaling proteins, gene expression analysis\",\n      \"journal\": \"International Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reciprocal gain/loss of function with multiple phenotypic readouts, co-IP identifying Wnt pathway association, single lab\",\n      \"pmids\": [\"21064109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Galectin-4 binds to human monocytes and macrophages, inhibits Salmonella-induced MHC II upregulation, induces cytokine release, inhibits monocyte migration, and potently induces monocyte (but not macrophage) apoptosis. Supernatants from macrophages co-cultured with galectin-4 significantly restrict T-cell activation, linking galectin-4-mediated innate immune regulation to adaptive immune suppression.\",\n      \"method\": \"Flow cytometry (FACS binding, MHCII, apoptosis), Transwell migration assay, phagocytosis assay, cytokine measurement, T-cell co-culture\",\n      \"journal\": \"Cellular Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple functional assays in primary cells, single lab\",\n      \"pmids\": [\"21724180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"shRNA-mediated silencing of galectin-4 in HT-29 colorectal cancer cells increases cell proliferation and activates NF-κB and STAT3 signaling with IL-6 upregulation, upregulates NF-κB target genes, and enhances in vivo xenograft tumor growth, establishing galectin-4 as a suppressor of the IL-6/NF-κB/STAT3 signaling axis.\",\n      \"method\": \"shRNA knockdown, Western blotting, qPCR array, immunofluorescence, xenograft tumor assay\",\n      \"journal\": \"Cellular Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined signaling pathway activation and in vivo validation, single lab\",\n      \"pmids\": [\"23378274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Galectin-4 induces secretion of pro-angiogenic and pro-metastatic cytokines (G-CSF, IL-6, MCP-1, GROα) from blood vascular endothelial cells in vitro and in mice, and this galectin-induced cytokine secretion enhances endothelial cell surface adhesion molecule expression, increases cancer-endothelial adhesion, and promotes endothelial tubule formation.\",\n      \"method\": \"Cytokine array, in vitro endothelial cell treatment assays, in vivo mouse model, multiple regression analysis of patient serum\",\n      \"journal\": \"British Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — in vitro functional assays with in vivo confirmation, single lab\",\n      \"pmids\": [\"24384681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Galectin-4 mediates basolateral-to-apical transcytosis of the transferrin receptor (TfR) in epithelial cells lacking the basolateral sorting adaptor AP-1B (RPE and kidney proximal tubule cell lines, AP-1B-knockdown MDCK cells). Mutation of the N-glycan linked to N727 of TfR or knockdown of galectin-4 inhibits TfR transcytosis to apical recycling endosomes and the apical plasma membrane, instead promoting TfR lysosomal targeting and degradation.\",\n      \"method\": \"shRNA knockdown, N-glycosylation site mutagenesis, immunofluorescence, subcellular fractionation, pulse-chase trafficking assays\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal KD and mutagenesis approaches identifying a specific N-glycan signal and galectin-4 as required mediator of transcytosis, multiple cell lines\",\n      \"pmids\": [\"25179596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The X-ray crystal structure of the human galectin-4 C-terminal carbohydrate recognition domain (galectin-4C) was solved in complex with lactose, lactose-3'-sulfate, 2'-fucosyllactose, lacto-N-tetraose, and lacto-N-neotetraose. The structures reveal that galectin-4C recognizes sulfated saccharides without a specific amino acid contact with the sulfate group, and that the non-reducing-end galactose of lacto-N-tetraose and lacto-N-neotetraose adopt different binding orientations. Recognition of A and B blood group antigens is enabled by structural features of the extended binding site, while the 2'-fucose of blood group antigens does not interact directly with the protein.\",\n      \"method\": \"X-ray crystallography, molecular dynamics simulations\",\n      \"journal\": \"The FEBS Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structures in complex with multiple ligands providing atomic-level mechanistic detail\",\n      \"pmids\": [\"26077389\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LGALS4 (Galectin-4) is a tandem-repeat β-galactoside-binding lectin expressed predominantly in gastrointestinal epithelium that functions as an apical trafficking organizer by binding sulfatides and complex N-glycans to cluster lipid rafts/DRMs for apical delivery of glycoproteins (including mediating basolateral-to-apical transcytosis via N-glycan recognition), binds sulfated glycosphingolipids and cholesterol 3-sulfate (via Arg45) as well as CEA on the colon cell surface to promote cell adhesion, induces phosphatidylserine exposure on activated neutrophils in a carbohydrate-dependent manner, and suppresses colorectal cancer cell proliferation and migration by associating with and downregulating Wnt and IL-6/NF-κB/STAT3 signaling pathways.\"\n}\n```","stage2_raw":"\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Galectin-4 (LGALS4) is a tandem-repeat β-galactoside-binding lectin expressed predominantly in gastrointestinal epithelium that organizes apical membrane trafficking and modulates cell signaling and immune cell function. It clusters lipid rafts by binding sulfatides and complex N-glycans in detergent-resistant membranes, thereby directing post-Golgi apical delivery of glycoproteins in polarized enterocytes; its depletion causes intracellular accumulation of apical cargo without affecting basolateral markers, and it mediates basolateral-to-apical transcytosis of the transferrin receptor through recognition of a specific N-glycan [PMID:15883199, PMID:19192249, PMID:25179596]. Beyond trafficking, galectin-4 binds sulfated glycosphingolipids, cholesterol 3-sulfate (via Arg45), and CEA on colon cell surfaces to promote cell adhesion, and induces phosphatidylserine exposure on activated neutrophils in a carbohydrate-dependent manner [PMID:15546874, PMID:17545668, PMID:16940423]. In colorectal cancer cells, galectin-4 suppresses proliferation and migration by downregulating Wnt signaling and the IL-6/NF-κB/STAT3 axis, with its loss enhancing xenograft tumor growth [PMID:21064109, PMID:23378274].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Cloning of human galectin-4 established it as a two-CRD tandem-repeat lectin with expression restricted to the alimentary tract, defining the tissue context for all subsequent functional studies.\",\n      \"evidence\": \"cDNA cloning, sequencing, and Northern blot analysis of human tissues\",\n      \"pmids\": [\"9310382\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional data beyond expression pattern\", \"Post-translational modifications uncharacterized\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Subcellular localization studies revealed that galectin-4 concentrates at sites of cell-substrate contact and lamellipodia, and immobilized galectin-4 directly promotes epithelial cell adhesion, providing the first evidence for an adhesion-related function.\",\n      \"evidence\": \"Immunofluorescence and cell adhesion assays in T84 colon carcinoma cells\",\n      \"pmids\": [\"9162064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-surface receptors mediating adhesion not identified\", \"In vivo relevance untested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Quantitative binding studies demonstrated that galectin-4 preferentially recognizes 3-O-sulfated glycans over unsulfated or sialylated core structures, shifting the field from generic β-galactoside binding to sulfation-dependent specificity.\",\n      \"evidence\": \"Surface plasmon resonance and competitive inhibition assays with defined saccharide ligands\",\n      \"pmids\": [\"11971864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which CRD (N- or C-terminal) mediates sulfated glycan preference was unknown\", \"In vivo ligands in intestinal epithelium not confirmed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of sulfated glycosphingolipids and CEA as galectin-4 ligands on colon cell surfaces, with co-localization in lipid microdomains, connected galectin-4's carbohydrate specificity to a concrete cell-surface organizing function.\",\n      \"evidence\": \"Co-immunoprecipitation, SPR binding, confocal microscopy, and adhesion assays in colon carcinoma cells\",\n      \"pmids\": [\"15546874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether galectin-4–CEA interaction has signaling consequences was untested\", \"Functional role of lipid microdomain organization not yet established\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"RNAi knockdown demonstrated that galectin-4 is required for apical delivery of membrane glycoproteins via lipid raft clustering, establishing it as a sorting lectin in polarized epithelial trafficking.\",\n      \"evidence\": \"Retroviral shRNA knockdown, DRM fractionation, immunofluorescence, and mass spectrometry in HT-29 5M12 enterocytic cells\",\n      \"pmids\": [\"15883199\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How galectin-4 itself is sorted to the apical pathway was unclear\", \"Whether galectin-4 acts alone or with co-factors in raft clustering was unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery that galectin-4 binds cholesterol 3-sulfate—a non-β-galactoside lipid—via Arg45, revealed an unprecedented ligand-recognition mode for galectins and expanded the range of membrane lipids galectin-4 can organize.\",\n      \"evidence\": \"Site-directed mutagenesis (R45A), gel filtration, cross-linking, and detergent-insoluble fraction analysis in porcine tissues\",\n      \"pmids\": [\"17545668\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of cholesterol 3-sulfate recognition not resolved at atomic level\", \"Physiological concentration of cholesterol 3-sulfate in intestinal membranes not measured\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mechanistic dissection showed that galectin-4 recruits apical glycoproteins bearing complex N-glycans into DRMs post-Golgi, and that galectin-4 itself follows an apical endocytic-recycling route, placing it in a self-reinforcing apical sorting circuit.\",\n      \"evidence\": \"shRNA knockdown, DRM fractionation, N-glycan mass spectrometry, and endocytic recycling assays in HT-29 cells\",\n      \"pmids\": [\"19192249\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of galectin-4 externalization (non-classical secretion) unresolved\", \"Whether other galectins compensate in vivo remains unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Gain- and loss-of-function experiments in colorectal cancer cells linked galectin-4 to Wnt pathway suppression, cell-cycle arrest, and reduced migration, establishing a tumor-suppressive role beyond its trafficking function.\",\n      \"evidence\": \"Forced expression and shRNA knockdown with co-IP of Wnt pathway proteins, proliferation/migration assays, and apoptosis sensitization in CRC cell lines\",\n      \"pmids\": [\"21064109\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target within the Wnt pathway not identified\", \"Mechanism connecting lectin activity to Wnt suppression unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Galectin-4 was shown to modulate innate immunity by binding monocytes and macrophages, inducing monocyte apoptosis and cytokine release, and suppressing T-cell activation indirectly, extending its biology beyond epithelial trafficking.\",\n      \"evidence\": \"FACS binding, Transwell migration, phagocytosis, cytokine, and T-cell co-culture assays with primary human monocytes/macrophages\",\n      \"pmids\": [\"21724180\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Monocyte surface receptor for galectin-4 not identified\", \"In vivo relevance in gut immune homeostasis untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Silencing galectin-4 activated the IL-6/NF-κB/STAT3 signaling axis and enhanced xenograft tumor growth, confirming galectin-4 as a suppressor of pro-inflammatory oncogenic signaling in colorectal cancer.\",\n      \"evidence\": \"shRNA knockdown, Western blot and qPCR array for signaling, and xenograft model in HT-29 cells\",\n      \"pmids\": [\"23378274\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether galectin-4 directly inhibits NF-κB or acts upstream via membrane organization not distinguished\", \"Single cell line for in vivo studies\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Galectin-4 was identified as a mediator of basolateral-to-apical transcytosis of the transferrin receptor through recognition of a specific N-glycan (N727), with its loss diverting TfR to lysosomal degradation, revealing a glycan-dependent cargo sorting decision.\",\n      \"evidence\": \"shRNA knockdown and N-glycosylation site mutagenesis with pulse-chase trafficking in RPE, kidney, and MDCK cells\",\n      \"pmids\": [\"25179596\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other cargo glycoproteins use the same N-glycan-dependent transcytosis mechanism is unknown\", \"Structural basis of galectin-4 selectivity for N727-linked glycan not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Crystal structures of the C-terminal CRD with multiple ligands provided atomic-level understanding of how galectin-4 accommodates sulfated, fucosylated, and blood group saccharides, revealing that sulfate recognition does not involve a direct amino acid–sulfate contact.\",\n      \"evidence\": \"X-ray crystallography of galectin-4C with lactose, lactose-3'-sulfate, 2'-fucosyllactose, lacto-N-tetraose, and lacto-N-neotetraose\",\n      \"pmids\": [\"26077389\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"N-terminal CRD structures in complex with sulfated ligands not reported\", \"No structure of full-length tandem-repeat protein available\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the in vivo role of galectin-4 in intestinal epithelial polarity (no knockout mouse phenotype reported), the mechanism of its non-classical secretion, and whether its tumor-suppressive effects operate through lectin-mediated membrane organization or independent intracellular signaling.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No galectin-4 knockout animal model phenotype reported\", \"Non-classical secretion mechanism unknown\", \"Relationship between trafficking and tumor-suppressive functions unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2, 3, 4, 6, 13]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 3, 4]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 7]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [7, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0009536\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [4, 7, 12]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4, 7, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CEACAM5\",\n      \"TFR1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}