{"gene":"CD300LG","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2006,"finding":"CD300LG (nepmucin) is a member of the CD300 antigen-like family with an Ig V-like domain expressed uniquely on capillary endothelium; immunoelectron microscopy showed localization on apical and basolateral plasma membranes and intracellular vesicular structures; transcytosis assays in polarized MDCK cells demonstrated bidirectional transcytosis; and exogenous expression on HeLa cells enabled uptake of IgA2 and IgM but not IgG.","method":"Immunoelectron microscopy, transcytosis assay in polarized MDCK cells, exogenous expression in HeLa cells with IgA2/IgM uptake assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal direct functional assays (transcytosis, selective Ig uptake, subcellular localization by immuno-EM) in a single focused study","pmids":["16876123"],"is_preprint":false},{"year":2013,"finding":"Nepmucin/CD300LG is constitutively expressed at the luminal surface of microvascular endothelial cells and is implicated in lymphocyte binding and transmigration; its expression is rapidly downregulated by TNF-α during acute inflammation in lymph nodes, and it is induced in HEV-like vessels of chronically inflamed pancreatic islets where infiltrating activated CD4+ T cells express high levels of the nepmucin/CD300LG ligand(s), supporting a role in pathological T cell trafficking.","method":"Immunohistochemistry, in vivo inflammatory models, TNF-α treatment, non-obese diabetic mouse model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple in vivo models and tissue analyses in a single lab, functional link to lymphocyte transmigration established by expression and ligand co-localization but no direct blocking experiment","pmids":["24376728"],"is_preprint":false},{"year":2016,"finding":"Trem4 (mouse ortholog of CD300LG) lacks an ITIM but possesses positively charged transmembrane residues that enable direct association with DAP12; DAP12 coupling is mandatory for Trem4 surface expression on myeloid cells; polyI:C followed by type I IFN production induced Trem4 expression in bone-marrow-derived dendritic cells and macrophages.","method":"Co-immunoprecipitation of Trem4 with DAP12, surface expression analysis, polyI:C/IFN stimulation in BMDCs and BMDMs","journal":"BMC immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct DAP12 association shown by co-IP, surface expression dependency confirmed, stimulation experiments in primary cells; single lab","pmids":["27141827"],"is_preprint":false},{"year":2015,"finding":"The CD300LG Arg82Cys polymorphism (rs72836561) is associated with decreased CD300LG mRNA expression in skeletal muscle and adipose tissue, increased intramyocellular lipid content, and impaired fasting forearm glucose uptake; CD300LG mRNA levels in muscle correlated independently with intramyocellular lipid content and forearm glucose uptake, linking CD300LG to regulation of lipid accumulation and glucose metabolism.","method":"Hyperinsulinemic euglycemic clamp, MR spectroscopy (IMCL/IHLC), quantitative PCR for CD300LG mRNA in muscle and fat, recall-by-genotype design","journal":"BMJ open diabetes research & care","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal metabolic phenotyping methods in a controlled recall-by-genotype human study; single lab","pmids":["26336608"],"is_preprint":false},{"year":2019,"finding":"Trem4 (CD300LG) is expressed on the surface of CD11b+ dendritic cells in mediastinal lymph nodes; blockade of Trem4 on mediastinal DCs reduced their ability to prime CD4+ T cells that home to the lung, establishing a co-stimulatory role for Trem4 in lung-homing CD4+ T cell priming.","method":"Flow cytometry, sorted DC–T cell co-cultures, surface molecule blockade, in vivo murine intranasal/intramuscular immunization","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional blockade in co-culture and in vivo model with defined phenotypic readout; single lab","pmids":["31396211"],"is_preprint":false},{"year":2022,"finding":"The Arg82Cys (rs72836561) polymorphism in nepmucin/CD300LG is associated with lower fasting plasma concentrations of cholesterol in large HDL particles and lower ApoA1, indicating a link between CD300LG and HDL metabolism or maturation.","method":"Population-based cohort study (Oxford BioBank, n=4522) and recall-by-genotype studies; HDL subclass quantification","journal":"Journal of the Endocrine Society","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — large cohort association with orthogonal recall-by-genotype validation; mechanistic link is genetic/associative rather than direct biochemical","pmids":["35382499"],"is_preprint":false},{"year":2024,"finding":"CD300LG serum levels increase in response to 12 weeks of combined strength and endurance exercise in men; serum CD300LG positively associates with insulin sensitivity and with angiogenesis-related gene expression in muscle and fat; CD300LG mRNA changes concordantly in muscle and fat after exercise; Mendelian randomization analysis suggests a potential causal relationship between CD300LG levels and fasting glucose, 2-hour OGTT glucose, and HbA1c; male Cd300lg knockout mice show impaired glucose tolerance, whereas female knockouts do not.","method":"Serum proteomics (SomaScan), hyperinsulinemic euglycemic clamp, muscle/fat mRNA sequencing, UK Biobank association analysis, two-sample Mendelian randomization, Cd300lg knockout mouse model","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (proteomic profiling, KO mouse phenotyping, Mendelian randomization in large population) across human and mouse models with functional glucose tolerance readout","pmids":["39190027"],"is_preprint":false},{"year":2024,"finding":"CD300LG (transmembrane protein) on tumor-associated monocytes (TAMos) mediates reprogramming of CD8+ T cells into T central memory-like (TCM-like) cells in a cell-cell contact-dependent manner; the terminally differentiated TAMo subset (CD300LGhighACElow) was identified as primarily responsible for TCM-like cell development.","method":"Cell–cell contact assays, CD300LG expression profiling on monocyte subsets, in vitro co-culture of TAMos and CD8+ T cells, in vivo antitumor experiments with modified T cells","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — contact-dependent mechanism demonstrated in vitro with defined subpopulation and in vivo antitumor readout; single lab","pmids":["38386350"],"is_preprint":false},{"year":2025,"finding":"CD300LG functions as a receptor for triglyceride-rich lipoproteins (TRLs; VLDL and chylomicrons) at the microvascular endothelium; it directly interacts with ApoA4 to facilitate TRL clearance; CD300LG deficiency in mice causes postprandial hypertriglyceridemia that is independent of changes in VLDL secretion, intestinal lipid absorption, or lipoprotein lipase activity; human genetic analysis shows reduced CD300LG protein levels are causally linked with coronary artery disease risk and increased TRL number, diameter, and triglyceride concentration.","method":"Direct binding/interaction assay (CD300LG–ApoA4), CD300LG knockout mouse model with postprandial lipid challenge, VLDL secretion assay, intestinal absorption assay, lipoprotein lipase activity assay, human genetic causal analysis","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct receptor–ligand interaction identified, mechanism dissected by KO mouse with multiple negative controls (LPL, VLDL secretion, absorption) ruling out alternative pathways, supported by human genetic causal analysis; preprint but multiple orthogonal approaches","pmids":["bio_10.1101_2025.08.08.669356"],"is_preprint":true}],"current_model":"CD300LG (nepmucin) is a membrane-bound Ig-domain receptor constitutively expressed on microvascular endothelial cells that (1) acts as a direct receptor for triglyceride-rich lipoproteins by binding ApoA4 to facilitate postprandial TRL clearance at the capillary endothelium, (2) supports lymphocyte binding and transmigration whose expression is dynamically regulated by inflammatory signals including TNF-α, (3) associates with DAP12 (in myeloid-cell-expressed murine Trem4) to enable surface expression and participate in innate immune signaling, (4) functions on dendritic cells as a co-stimulatory molecule that promotes lung-homing CD4+ T cell priming, (5) mediates contact-dependent reprogramming of CD8+ T cells into central memory-like cells by tumor-associated monocytes, and (6) is linked via its Arg82Cys polymorphism to impaired glucose metabolism, increased intramyocellular lipid content, and reduced HDL cholesterol, with Mendelian randomization and Cd300lg knockout mouse data suggesting a causal role for CD300LG in glucose homeostasis."},"narrative":{"mechanistic_narrative":"CD300LG (nepmucin) is a membrane-bound Ig V-like domain receptor of the CD300 family expressed on capillary and microvascular endothelium that bridges lipoprotein metabolism and immune cell trafficking [PMID:16876123]. At the apical and basolateral endothelial surface it undergoes bidirectional transcytosis and selectively mediates uptake of IgA2 and IgM but not IgG [PMID:16876123]. Its best-defined function is as an endothelial receptor for triglyceride-rich lipoproteins (VLDL and chylomicrons): CD300LG directly binds ApoA4 to drive postprandial TRL clearance, and its loss in mice produces postprandial hypertriglyceridemia independent of VLDL secretion, intestinal absorption, or lipoprotein lipase activity, with reduced human CD300LG protein causally linked to elevated TRL and coronary artery disease risk [PMID:bio_10.1101_2025.08.08.669356]. Consistent with a metabolic role, the Arg82Cys polymorphism and reduced CD300LG expression associate with impaired glucose uptake, increased intramyocellular lipid, and altered HDL/ApoA1 metabolism [PMID:26336608, PMID:35382499], and male Cd300lg knockout mice show impaired glucose tolerance while Mendelian randomization supports a causal relationship between CD300LG levels and fasting glucose, OGTT glucose, and HbA1c [PMID:39190027]. In parallel, CD300LG supports lymphocyte binding and transmigration at the endothelium, where its expression is rapidly downregulated by TNF-α during acute inflammation and induced in chronically inflamed HEV-like vessels [PMID:24376728]. The mouse ortholog Trem4 associates directly with DAP12 through positively charged transmembrane residues, a coupling required for surface expression on myeloid cells [PMID:27141827], and on dendritic cells and tumor-associated monocytes CD300LG acts as a contact-dependent co-stimulatory molecule that primes lung-homing CD4+ T cells and reprograms CD8+ T cells into central memory-like cells [PMID:31396211, PMID:38386350].","teleology":[{"year":2006,"claim":"Established CD300LG as an endothelial-restricted Ig-domain membrane protein capable of transcytosis and selective immunoglobulin uptake, defining its baseline molecular identity and trafficking behavior.","evidence":"Immuno-EM, transcytosis assay in polarized MDCK cells, and IgA2/IgM uptake in HeLa cells","pmids":["16876123"],"confidence":"High","gaps":["Endogenous physiological cargo of transcytosis not identified","Mechanism and receptor basis of selective IgA2/IgM versus IgG discrimination unresolved"]},{"year":2013,"claim":"Linked CD300LG to lymphocyte trafficking by showing its luminal endothelial expression is dynamically regulated by inflammation, framing it as a context-dependent adhesion/transmigration molecule.","evidence":"Immunohistochemistry, TNF-α treatment, and in vivo inflammatory and NOD mouse models","pmids":["24376728"],"confidence":"Medium","gaps":["No direct blocking experiment demonstrating requirement in transmigration","Lymphocyte-expressed ligand(s) not molecularly identified"]},{"year":2015,"claim":"Connected CD300LG to human metabolic physiology by tying the Arg82Cys variant and reduced muscle/fat expression to lipid accumulation and impaired glucose uptake.","evidence":"Recall-by-genotype human study with euglycemic clamp, MR spectroscopy, and qPCR","pmids":["26336608"],"confidence":"Medium","gaps":["Associative, not mechanistic — does not show how CD300LG controls IMCL or glucose uptake","No causal demonstration in this study"]},{"year":2016,"claim":"Defined a signaling competence for the ortholog Trem4/CD300LG by showing DAP12 coupling via charged transmembrane residues is mandatory for myeloid surface expression.","evidence":"Co-IP of Trem4 with DAP12, surface expression dependency, and polyI:C/IFN stimulation in BMDCs/BMDMs","pmids":["27141827"],"confidence":"Medium","gaps":["Downstream DAP12 signaling output not characterized","Single lab; relationship to endothelial CD300LG function not established"]},{"year":2019,"claim":"Demonstrated a co-stimulatory immune function by showing Trem4 blockade on dendritic cells reduces priming of lung-homing CD4+ T cells.","evidence":"Flow cytometry, DC–T cell co-culture, surface blockade, and in vivo immunization in mice","pmids":["31396211"],"confidence":"Medium","gaps":["Ligand/receptor on T cells driving co-stimulation unknown","Molecular signaling mechanism not defined"]},{"year":2022,"claim":"Extended the metabolic link to lipoprotein biology by associating Arg82Cys with lower large-HDL cholesterol and ApoA1.","evidence":"Large cohort (Oxford BioBank) plus recall-by-genotype HDL subclass quantification","pmids":["35382499"],"confidence":"Medium","gaps":["Genetic association only; no biochemical mechanism for HDL effect","Directionality with respect to TRL handling not resolved here"]},{"year":2024,"claim":"Provided causal evidence for CD300LG in glucose homeostasis by combining exercise-responsive serum proteomics, Mendelian randomization, and a knockout mouse with impaired glucose tolerance.","evidence":"SomaScan serum proteomics, euglycemic clamp, muscle/fat mRNA-seq, UK Biobank MR, and Cd300lg knockout mice","pmids":["39190027"],"confidence":"High","gaps":["Molecular basis of the sex difference (male-only KO phenotype) unexplained","Mechanism connecting serum CD300LG, angiogenesis genes, and insulin sensitivity not dissected"]},{"year":2024,"claim":"Revealed a tumor-immunity function in which CD300LG on tumor-associated monocytes reprograms CD8+ T cells into central memory-like cells through cell-cell contact.","evidence":"Monocyte subset expression profiling, TAMo–CD8 T cell co-culture, and in vivo antitumor experiments","pmids":["38386350"],"confidence":"Medium","gaps":["T cell-side receptor for CD300LG contact signal unidentified","Single lab; signaling pathway driving reprogramming undefined"]},{"year":2025,"claim":"Identified the core biochemical function of CD300LG as an endothelial TRL receptor that binds ApoA4 to clear postprandial lipoproteins, with human genetics tying its loss to coronary artery disease.","evidence":"Direct CD300LG–ApoA4 binding assay, KO mouse postprandial lipid challenge with VLDL/absorption/LPL controls, and human genetic causal analysis (preprint)","pmids":["bio_10.1101_2025.08.08.669356"],"confidence":"High","gaps":["Preprint; awaits peer review","Structural basis of CD300LG–ApoA4 interaction not resolved","Mechanistic link between TRL receptor activity and the glucose/HDL phenotypes not directly tested"]},{"year":null,"claim":"It remains unknown how CD300LG's endothelial lipoprotein-receptor activity mechanistically unifies its separate roles in glucose homeostasis, HDL metabolism, and immune cell co-stimulation.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No single model linking lipid clearance to glucose and immune phenotypes","Cytoplasmic/DAP12 signaling output not connected to endothelial cargo function","Structural and binding determinants of CD300LG ligand selectivity undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0038024","term_label":"cargo receptor activity","supporting_discovery_ids":[0,8]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[8]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[3,6,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,4,7]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,8]}],"complexes":[],"partners":["DAP12","APOA4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6UXG3","full_name":"CMRF35-like molecule 9","aliases":["CD300 antigen-like family member G","Triggering receptor expressed on myeloid cells 4","TREM-4"],"length_aa":332,"mass_kda":36.1,"function":"Receptor which may mediate L-selectin-dependent lymphocyte rollings. Binds SELL in a calcium dependent manner. Binds lymphocyte (By similarity)","subcellular_location":"Apical cell membrane; Basolateral cell membrane; Endosome, multivesicular body membrane","url":"https://www.uniprot.org/uniprotkb/Q6UXG3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CD300LG","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CD300LG","total_profiled":1310},"omim":[{"mim_id":"610520","title":"CD300 ANTIGEN-LIKE FAMILY, MEMBER G; CD300LG","url":"https://www.omim.org/entry/610520"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Calyx","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":123.7},{"tissue":"breast","ntpm":107.6},{"tissue":"placenta","ntpm":55.4}],"url":"https://www.proteinatlas.org/search/CD300LG"},"hgnc":{"alias_symbol":["Trem4","CLM9"],"prev_symbol":[]},"alphafold":{"accession":"Q6UXG3","domains":[{"cath_id":"2.60.40.10","chopping":"18-126","consensus_level":"high","plddt":94.7565,"start":18,"end":126},{"cath_id":"1.20.5","chopping":"250-296","consensus_level":"medium","plddt":82.764,"start":250,"end":296}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6UXG3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6UXG3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6UXG3-F1-predicted_aligned_error_v6.png","plddt_mean":68.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CD300LG","jax_strain_url":"https://www.jax.org/strain/search?query=CD300LG"},"sequence":{"accession":"Q6UXG3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6UXG3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6UXG3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6UXG3"}},"corpus_meta":[{"pmid":"31182966","id":"PMC_31182966","title":"Transcriptome 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bidirectional transcytosis; and exogenous expression on HeLa cells enabled uptake of IgA2 and IgM but not IgG.\",\n      \"method\": \"Immunoelectron microscopy, transcytosis assay in polarized MDCK cells, exogenous expression in HeLa cells with IgA2/IgM uptake assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal direct functional assays (transcytosis, selective Ig uptake, subcellular localization by immuno-EM) in a single focused study\",\n      \"pmids\": [\"16876123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nepmucin/CD300LG is constitutively expressed at the luminal surface of microvascular endothelial cells and is implicated in lymphocyte binding and transmigration; its expression is rapidly downregulated by TNF-α during acute inflammation in lymph nodes, and it is induced in HEV-like vessels of chronically inflamed pancreatic islets where infiltrating activated CD4+ T cells express high levels of the nepmucin/CD300LG ligand(s), supporting a role in pathological T cell trafficking.\",\n      \"method\": \"Immunohistochemistry, in vivo inflammatory models, TNF-α treatment, non-obese diabetic mouse model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple in vivo models and tissue analyses in a single lab, functional link to lymphocyte transmigration established by expression and ligand co-localization but no direct blocking experiment\",\n      \"pmids\": [\"24376728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Trem4 (mouse ortholog of CD300LG) lacks an ITIM but possesses positively charged transmembrane residues that enable direct association with DAP12; DAP12 coupling is mandatory for Trem4 surface expression on myeloid cells; polyI:C followed by type I IFN production induced Trem4 expression in bone-marrow-derived dendritic cells and macrophages.\",\n      \"method\": \"Co-immunoprecipitation of Trem4 with DAP12, surface expression analysis, polyI:C/IFN stimulation in BMDCs and BMDMs\",\n      \"journal\": \"BMC immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct DAP12 association shown by co-IP, surface expression dependency confirmed, stimulation experiments in primary cells; single lab\",\n      \"pmids\": [\"27141827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The CD300LG Arg82Cys polymorphism (rs72836561) is associated with decreased CD300LG mRNA expression in skeletal muscle and adipose tissue, increased intramyocellular lipid content, and impaired fasting forearm glucose uptake; CD300LG mRNA levels in muscle correlated independently with intramyocellular lipid content and forearm glucose uptake, linking CD300LG to regulation of lipid accumulation and glucose metabolism.\",\n      \"method\": \"Hyperinsulinemic euglycemic clamp, MR spectroscopy (IMCL/IHLC), quantitative PCR for CD300LG mRNA in muscle and fat, recall-by-genotype design\",\n      \"journal\": \"BMJ open diabetes research & care\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal metabolic phenotyping methods in a controlled recall-by-genotype human study; single lab\",\n      \"pmids\": [\"26336608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Trem4 (CD300LG) is expressed on the surface of CD11b+ dendritic cells in mediastinal lymph nodes; blockade of Trem4 on mediastinal DCs reduced their ability to prime CD4+ T cells that home to the lung, establishing a co-stimulatory role for Trem4 in lung-homing CD4+ T cell priming.\",\n      \"method\": \"Flow cytometry, sorted DC–T cell co-cultures, surface molecule blockade, in vivo murine intranasal/intramuscular immunization\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional blockade in co-culture and in vivo model with defined phenotypic readout; single lab\",\n      \"pmids\": [\"31396211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The Arg82Cys (rs72836561) polymorphism in nepmucin/CD300LG is associated with lower fasting plasma concentrations of cholesterol in large HDL particles and lower ApoA1, indicating a link between CD300LG and HDL metabolism or maturation.\",\n      \"method\": \"Population-based cohort study (Oxford BioBank, n=4522) and recall-by-genotype studies; HDL subclass quantification\",\n      \"journal\": \"Journal of the Endocrine Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — large cohort association with orthogonal recall-by-genotype validation; mechanistic link is genetic/associative rather than direct biochemical\",\n      \"pmids\": [\"35382499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CD300LG serum levels increase in response to 12 weeks of combined strength and endurance exercise in men; serum CD300LG positively associates with insulin sensitivity and with angiogenesis-related gene expression in muscle and fat; CD300LG mRNA changes concordantly in muscle and fat after exercise; Mendelian randomization analysis suggests a potential causal relationship between CD300LG levels and fasting glucose, 2-hour OGTT glucose, and HbA1c; male Cd300lg knockout mice show impaired glucose tolerance, whereas female knockouts do not.\",\n      \"method\": \"Serum proteomics (SomaScan), hyperinsulinemic euglycemic clamp, muscle/fat mRNA sequencing, UK Biobank association analysis, two-sample Mendelian randomization, Cd300lg knockout mouse model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (proteomic profiling, KO mouse phenotyping, Mendelian randomization in large population) across human and mouse models with functional glucose tolerance readout\",\n      \"pmids\": [\"39190027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CD300LG (transmembrane protein) on tumor-associated monocytes (TAMos) mediates reprogramming of CD8+ T cells into T central memory-like (TCM-like) cells in a cell-cell contact-dependent manner; the terminally differentiated TAMo subset (CD300LGhighACElow) was identified as primarily responsible for TCM-like cell development.\",\n      \"method\": \"Cell–cell contact assays, CD300LG expression profiling on monocyte subsets, in vitro co-culture of TAMos and CD8+ T cells, in vivo antitumor experiments with modified T cells\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — contact-dependent mechanism demonstrated in vitro with defined subpopulation and in vivo antitumor readout; single lab\",\n      \"pmids\": [\"38386350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CD300LG functions as a receptor for triglyceride-rich lipoproteins (TRLs; VLDL and chylomicrons) at the microvascular endothelium; it directly interacts with ApoA4 to facilitate TRL clearance; CD300LG deficiency in mice causes postprandial hypertriglyceridemia that is independent of changes in VLDL secretion, intestinal lipid absorption, or lipoprotein lipase activity; human genetic analysis shows reduced CD300LG protein levels are causally linked with coronary artery disease risk and increased TRL number, diameter, and triglyceride concentration.\",\n      \"method\": \"Direct binding/interaction assay (CD300LG–ApoA4), CD300LG knockout mouse model with postprandial lipid challenge, VLDL secretion assay, intestinal absorption assay, lipoprotein lipase activity assay, human genetic causal analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct receptor–ligand interaction identified, mechanism dissected by KO mouse with multiple negative controls (LPL, VLDL secretion, absorption) ruling out alternative pathways, supported by human genetic causal analysis; preprint but multiple orthogonal approaches\",\n      \"pmids\": [\"bio_10.1101_2025.08.08.669356\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"CD300LG (nepmucin) is a membrane-bound Ig-domain receptor constitutively expressed on microvascular endothelial cells that (1) acts as a direct receptor for triglyceride-rich lipoproteins by binding ApoA4 to facilitate postprandial TRL clearance at the capillary endothelium, (2) supports lymphocyte binding and transmigration whose expression is dynamically regulated by inflammatory signals including TNF-α, (3) associates with DAP12 (in myeloid-cell-expressed murine Trem4) to enable surface expression and participate in innate immune signaling, (4) functions on dendritic cells as a co-stimulatory molecule that promotes lung-homing CD4+ T cell priming, (5) mediates contact-dependent reprogramming of CD8+ T cells into central memory-like cells by tumor-associated monocytes, and (6) is linked via its Arg82Cys polymorphism to impaired glucose metabolism, increased intramyocellular lipid content, and reduced HDL cholesterol, with Mendelian randomization and Cd300lg knockout mouse data suggesting a causal role for CD300LG in glucose homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CD300LG (nepmucin) is a membrane-bound Ig V-like domain receptor of the CD300 family expressed on capillary and microvascular endothelium that bridges lipoprotein metabolism and immune cell trafficking [#0]. At the apical and basolateral endothelial surface it undergoes bidirectional transcytosis and selectively mediates uptake of IgA2 and IgM but not IgG [#0]. Its best-defined function is as an endothelial receptor for triglyceride-rich lipoproteins (VLDL and chylomicrons): CD300LG directly binds ApoA4 to drive postprandial TRL clearance, and its loss in mice produces postprandial hypertriglyceridemia independent of VLDL secretion, intestinal absorption, or lipoprotein lipase activity, with reduced human CD300LG protein causally linked to elevated TRL and coronary artery disease risk [#8]. Consistent with a metabolic role, the Arg82Cys polymorphism and reduced CD300LG expression associate with impaired glucose uptake, increased intramyocellular lipid, and altered HDL/ApoA1 metabolism [#3, #5], and male Cd300lg knockout mice show impaired glucose tolerance while Mendelian randomization supports a causal relationship between CD300LG levels and fasting glucose, OGTT glucose, and HbA1c [#6]. In parallel, CD300LG supports lymphocyte binding and transmigration at the endothelium, where its expression is rapidly downregulated by TNF-α during acute inflammation and induced in chronically inflamed HEV-like vessels [#1]. The mouse ortholog Trem4 associates directly with DAP12 through positively charged transmembrane residues, a coupling required for surface expression on myeloid cells [#2], and on dendritic cells and tumor-associated monocytes CD300LG acts as a contact-dependent co-stimulatory molecule that primes lung-homing CD4+ T cells and reprograms CD8+ T cells into central memory-like cells [#4, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established CD300LG as an endothelial-restricted Ig-domain membrane protein capable of transcytosis and selective immunoglobulin uptake, defining its baseline molecular identity and trafficking behavior.\",\n      \"evidence\": \"Immuno-EM, transcytosis assay in polarized MDCK cells, and IgA2/IgM uptake in HeLa cells\",\n      \"pmids\": [\"16876123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous physiological cargo of transcytosis not identified\", \"Mechanism and receptor basis of selective IgA2/IgM versus IgG discrimination unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked CD300LG to lymphocyte trafficking by showing its luminal endothelial expression is dynamically regulated by inflammation, framing it as a context-dependent adhesion/transmigration molecule.\",\n      \"evidence\": \"Immunohistochemistry, TNF-α treatment, and in vivo inflammatory and NOD mouse models\",\n      \"pmids\": [\"24376728\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct blocking experiment demonstrating requirement in transmigration\", \"Lymphocyte-expressed ligand(s) not molecularly identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected CD300LG to human metabolic physiology by tying the Arg82Cys variant and reduced muscle/fat expression to lipid accumulation and impaired glucose uptake.\",\n      \"evidence\": \"Recall-by-genotype human study with euglycemic clamp, MR spectroscopy, and qPCR\",\n      \"pmids\": [\"26336608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Associative, not mechanistic — does not show how CD300LG controls IMCL or glucose uptake\", \"No causal demonstration in this study\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined a signaling competence for the ortholog Trem4/CD300LG by showing DAP12 coupling via charged transmembrane residues is mandatory for myeloid surface expression.\",\n      \"evidence\": \"Co-IP of Trem4 with DAP12, surface expression dependency, and polyI:C/IFN stimulation in BMDCs/BMDMs\",\n      \"pmids\": [\"27141827\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream DAP12 signaling output not characterized\", \"Single lab; relationship to endothelial CD300LG function not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated a co-stimulatory immune function by showing Trem4 blockade on dendritic cells reduces priming of lung-homing CD4+ T cells.\",\n      \"evidence\": \"Flow cytometry, DC–T cell co-culture, surface blockade, and in vivo immunization in mice\",\n      \"pmids\": [\"31396211\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ligand/receptor on T cells driving co-stimulation unknown\", \"Molecular signaling mechanism not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended the metabolic link to lipoprotein biology by associating Arg82Cys with lower large-HDL cholesterol and ApoA1.\",\n      \"evidence\": \"Large cohort (Oxford BioBank) plus recall-by-genotype HDL subclass quantification\",\n      \"pmids\": [\"35382499\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genetic association only; no biochemical mechanism for HDL effect\", \"Directionality with respect to TRL handling not resolved here\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided causal evidence for CD300LG in glucose homeostasis by combining exercise-responsive serum proteomics, Mendelian randomization, and a knockout mouse with impaired glucose tolerance.\",\n      \"evidence\": \"SomaScan serum proteomics, euglycemic clamp, muscle/fat mRNA-seq, UK Biobank MR, and Cd300lg knockout mice\",\n      \"pmids\": [\"39190027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the sex difference (male-only KO phenotype) unexplained\", \"Mechanism connecting serum CD300LG, angiogenesis genes, and insulin sensitivity not dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a tumor-immunity function in which CD300LG on tumor-associated monocytes reprograms CD8+ T cells into central memory-like cells through cell-cell contact.\",\n      \"evidence\": \"Monocyte subset expression profiling, TAMo–CD8 T cell co-culture, and in vivo antitumor experiments\",\n      \"pmids\": [\"38386350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"T cell-side receptor for CD300LG contact signal unidentified\", \"Single lab; signaling pathway driving reprogramming undefined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified the core biochemical function of CD300LG as an endothelial TRL receptor that binds ApoA4 to clear postprandial lipoproteins, with human genetics tying its loss to coronary artery disease.\",\n      \"evidence\": \"Direct CD300LG–ApoA4 binding assay, KO mouse postprandial lipid challenge with VLDL/absorption/LPL controls, and human genetic causal analysis (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.08.08.669356\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Preprint; awaits peer review\", \"Structural basis of CD300LG–ApoA4 interaction not resolved\", \"Mechanistic link between TRL receptor activity and the glucose/HDL phenotypes not directly tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how CD300LG's endothelial lipoprotein-receptor activity mechanistically unifies its separate roles in glucose homeostasis, HDL metabolism, and immune cell co-stimulation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No single model linking lipid clearance to glucose and immune phenotypes\", \"Cytoplasmic/DAP12 signaling output not connected to endothelial cargo function\", \"Structural and binding determinants of CD300LG ligand selectivity undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0038024\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [3, 6, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 4, 7]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"DAP12\", \"APOA4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}