{"gene":"DGKG","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2023,"finding":"Endothelial DGKG promotes tumor angiogenesis and immune evasion in HCC by recruiting ubiquitin specific peptidase 16 (USP16) to facilitate K48-linked deubiquitination and stabilization of ZEB2, leading to increased TGF-β1 secretion, which induces tumor angiogenesis and regulatory T-cell differentiation. HIF-1α directly binds the DGKG promoter under hypoxia to activate its transcription.","method":"Co-IP (USP16-DGKG-ZEB2 interaction), in vitro and in vivo functional studies (knockdown/overexpression), HIF-1α promoter binding assay, single-cell RNA-seq, CyTOF, flow cytometry, multiplexed IHC","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, in vivo mouse models, promoter binding, functional rescue) in a single study with strong mechanistic resolution","pmids":["37838036"],"is_preprint":false},{"year":2017,"finding":"DGKγ (encoded by DGKG) suppresses colorectal cancer cell migration and invasion, and suppresses Rac1 activity. Notably, both kinase-dead and constitutively active DGKγ mutants retain inhibitory effects on proliferation, migration, invasion, and Rac1 activity, indicating a kinase-independent mechanism for some functions.","method":"Ectopic expression of wild-type, kinase-dead, and constitutively active DGKγ mutants in CRC cell lines; Rac1 activity assay; migration/invasion assays","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — active-site mutagenesis with functional readout in multiple cell-based assays; single lab","pmids":["28218473"],"is_preprint":false},{"year":2017,"finding":"DGKG is expressed predominantly in somatostatin (SST)-expressing GABAergic interneurons in the cortex, and loss-of-function analysis in ganglionic eminence neurons demonstrates that Dgkg regulates neurite outgrowth of GABAergic neurons.","method":"FACS-array genome-wide screening, correlational gene expression analysis, functional knockdown in GE neurons with neurite outgrowth readout","journal":"Neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 — direct loss-of-function with defined cellular phenotype (neurite outgrowth) in primary neurons; single lab","pmids":["29203264"],"is_preprint":false},{"year":2025,"finding":"A hypoxia-induced alternatively spliced transcript of DGKG lacking exon 13 (DGKG-Δexon13) promotes glioblastoma cell proliferation, migration, and invasion more potently than wild-type DGKG. DGKG knockdown reduces these capacities in vitro and reduces tumor volume in vivo. DGKG-Δexon13 specifically regulates IL-16, CCN2, and EFNB3 expression.","method":"PCR-Sanger sequencing (splice variant verification), CCK-8 proliferation assay, Transwell and Matrigel-Transwell invasion assays, in vivo orthotopic GBM mouse model, transcriptome analysis","journal":"Oncology research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal functional assays in vitro and in vivo; single lab","pmids":["40296900"],"is_preprint":false},{"year":1999,"finding":"The human DAGK3 (DGKG) gene spans >30 kb with 23 introns and maps by FISH to chromosome 3q27-28. Mutational analysis of the full coding region in 19 OPA1 patients excluded DAGK3 as a causative gene for dominant optic atrophy despite its abundant retinal expression.","method":"Genomic sequencing (intron-exon organization), fluorescence in situ hybridization (chromosomal mapping), mutational analysis of patient cohort","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct genomic characterization and chromosomal mapping with functional exclusion via patient mutation screening","pmids":["10071200"],"is_preprint":false},{"year":1995,"finding":"The DAGK3 (DGKG) gene, encoding a 90 kDa diacylglycerol kinase predominantly expressed in the retina, was localized by fluorescence in situ hybridization to human chromosome 3q27-28, with syntenic mapping of the mouse homolog to chromosome 16.","method":"Fluorescence in situ hybridization (FISH), interspecific backcross panel mapping","journal":"Current eye research","confidence":"Medium","confidence_rationale":"Tier 2 — direct chromosomal localization by FISH with synteny confirmation in mouse","pmids":["8585934"],"is_preprint":false},{"year":2022,"finding":"An iPSC line was generated from a patient carrying a heterozygous DGKG mutation (c.2042G>A, p.R681Q) associated with epilepsy, providing a cellular model linking DGKG mutation to a neurological disorder.","method":"Non-integrating episomal vector iPSC reprogramming from patient PBMCs; genotyping","journal":"Stem cell research","confidence":"Low","confidence_rationale":"Tier 3 — generation of a disease model cell line; no direct mechanistic assay on DGKG function performed","pmids":["35421845"],"is_preprint":false},{"year":2025,"finding":"DGKG overexpression in oral squamous cell carcinoma (OSCC) cells enhances migration and invasion, identifying it as a functional contributor to OSCC progression.","method":"Overexpression functional assays (migration and invasion) in OSCC cell lines","journal":"BMC oral health","confidence":"Low","confidence_rationale":"Tier 3 — single method (OE with phenotype), single lab, no pathway placement","pmids":["40887599"],"is_preprint":false}],"current_model":"DGKG (diacylglycerol kinase gamma) encodes a retina-enriched lipid kinase that, in endothelial cells, is transcriptionally activated by HIF-1α under hypoxia and promotes tumor angiogenesis and immune evasion by recruiting USP16 to deubiquitinate and stabilize ZEB2, thereby increasing TGF-β1 secretion; in colorectal cancer cells it suppresses Rac1 activity and cell migration/invasion through both kinase-dependent and kinase-independent mechanisms; and in GABAergic interneurons it regulates neurite outgrowth, with a hypoxia-induced alternatively spliced isoform (Δexon13) further promoting glioblastoma proliferation and invasion."},"narrative":{"teleology":[{"year":1995,"claim":"Chromosomal mapping established the genomic identity and tissue-enrichment pattern of DGKG, placing it at 3q27-28 with predominant retinal expression, which focused subsequent functional studies on neural and vascular tissues.","evidence":"FISH mapping of human locus and interspecific backcross mapping of mouse homolog","pmids":["8585934"],"confidence":"Medium","gaps":["No enzymatic characterization or substrate specificity analysis performed","Retinal function of DGKG not interrogated"]},{"year":1999,"claim":"Full genomic characterization of DGKG (23 introns, >30 kb) and mutational screening in dominant optic atrophy patients excluded DGKG as the OPA1 disease gene, despite its retinal abundance.","evidence":"Genomic sequencing of intron-exon boundaries and mutation screening of 19 OPA1 patients","pmids":["10071200"],"confidence":"Medium","gaps":["No retinal loss-of-function phenotype studied","Only one disease cohort tested"]},{"year":2017,"claim":"Functional studies revealed that DGKG suppresses Rac1 activity, migration, and invasion in colorectal cancer cells, and crucially, kinase-dead mutants retained these inhibitory effects, establishing that DGKG possesses kinase-independent scaffolding or protein-interaction functions.","evidence":"Ectopic expression of wild-type, kinase-dead, and constitutively active mutants in CRC cell lines with Rac1 activity, migration, and invasion readouts","pmids":["28218473"],"confidence":"Medium","gaps":["The kinase-independent binding partner mediating Rac1 suppression is unidentified","Findings limited to overexpression in CRC lines; endogenous loss-of-function not shown"]},{"year":2017,"claim":"Loss-of-function analysis in primary ganglionic eminence neurons demonstrated that DGKG regulates neurite outgrowth specifically in SST-expressing GABAergic interneurons, establishing a neuronal developmental role.","evidence":"FACS-array screening for cell-type expression followed by knockdown in GE neurons with neurite outgrowth quantification","pmids":["29203264"],"confidence":"Medium","gaps":["Downstream signaling pathway linking DGKG to neurite extension is undefined","In vivo interneuron phenotype not examined"]},{"year":2023,"claim":"A comprehensive mechanistic study showed that endothelial DGKG, induced by HIF-1α under hypoxia, recruits USP16 to deubiquitinate ZEB2 (K48-linked), stabilizing it and increasing TGF-β1 secretion that drives tumor angiogenesis and regulatory T-cell differentiation — the first pathway-level mechanism for DGKG in the tumor microenvironment.","evidence":"Co-IP of USP16-DGKG-ZEB2 complex, HIF-1α promoter binding assay, knockdown/overexpression with in vivo HCC models, scRNA-seq, CyTOF, and flow cytometry","pmids":["37838036"],"confidence":"High","gaps":["Whether the USP16-ZEB2 stabilization axis requires DGKG kinase activity is untested","Relevance beyond hepatocellular carcinoma endothelium not established","Structural basis for DGKG-USP16 interaction unknown"]},{"year":2025,"claim":"A hypoxia-induced alternatively spliced DGKG isoform lacking exon 13 was identified as a more potent driver of glioblastoma proliferation and invasion than wild-type DGKG, with regulation of IL-16, CCN2, and EFNB3 expression, connecting hypoxia-responsive splicing to DGKG oncogenic gain-of-function.","evidence":"PCR-Sanger sequencing of splice variant, CCK-8 proliferation and Transwell invasion assays, orthotopic GBM mouse model, transcriptome analysis","pmids":["40296900"],"confidence":"Medium","gaps":["Mechanism by which exon 13 loss enhances pro-tumorigenic activity is unclear","The splicing factor(s) responsible for the Δexon13 switch under hypoxia are not identified","Whether the Δexon13 isoform retains kinase activity is not determined"]},{"year":null,"claim":"Key unresolved questions include the structural basis for DGKG kinase-independent scaffolding functions, whether USP16 recruitment and Rac1 suppression share a common binding interface, the retinal function of DGKG, and how the Δexon13 splice variant gains enhanced oncogenic activity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of DGKG exists","Retinal loss-of-function phenotype has never been examined in vivo","Relationship between kinase-independent Rac1 suppression and USP16/ZEB2 stabilization mechanisms is unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,3]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,3]}],"complexes":[],"partners":["USP16","ZEB2","HIF1A"],"other_free_text":[]},"mechanistic_narrative":"DGKG encodes diacylglycerol kinase gamma, a retina-enriched lipid kinase that functions in lipid signaling, neuronal development, and tumor biology through both kinase-dependent and kinase-independent mechanisms. In endothelial cells, DGKG is transcriptionally activated by HIF-1α under hypoxia and promotes tumor angiogenesis and immune evasion by recruiting USP16 to deubiquitinate and stabilize ZEB2, increasing TGF-β1 secretion that drives regulatory T-cell differentiation [PMID:37838036]. In colorectal cancer cells, DGKG suppresses Rac1 activity, migration, and invasion through mechanisms that persist even with a kinase-dead mutant, indicating scaffolding or protein-interaction functions independent of its catalytic activity [PMID:28218473]. In SST-expressing GABAergic interneurons, DGKG regulates neurite outgrowth, and a hypoxia-induced splice variant lacking exon 13 promotes glioblastoma proliferation and invasion more potently than the wild-type protein [PMID:29203264, PMID:40296900]."},"prefetch_data":{"uniprot":{"accession":"P49619","full_name":"Diacylglycerol kinase gamma","aliases":["Diglyceride kinase gamma","DGK-gamma"],"length_aa":791,"mass_kda":89.1,"function":"Diacylglycerol kinase that converts diacylglycerol/DAG into phosphatidic acid/phosphatidate/PA and regulates the respective levels of these two bioactive lipids (PubMed:8034597). Thereby, acts as a central switch between the signaling pathways activated by these second messengers with different cellular targets and opposite effects in numerous biological processes (By similarity). Has no apparent specificity with regard to the acyl compositions of diacylglycerol (PubMed:8034597). Specifically expressed in the cerebellum where it controls the level of diacylglycerol which in turn regulates the activity of protein kinase C gamma. Through protein kinase C gamma, indirectly regulates the dendritic development of Purkinje cells, cerebellar long term depression and ultimately cerebellar motor coordination (By similarity)","subcellular_location":"Membrane; Cytoplasm, cytosol; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/P49619/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DGKG","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DGKG","total_profiled":1310},"omim":[{"mim_id":"601854","title":"DIACYLGLYCEROL KINASE, GAMMA, 90-KD; DGKG","url":"https://www.omim.org/entry/601854"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":25.7}],"url":"https://www.proteinatlas.org/search/DGKG"},"hgnc":{"alias_symbol":[],"prev_symbol":["DAGK3"]},"alphafold":{"accession":"P49619","domains":[{"cath_id":"1.10.238.110","chopping":"12-82_159-260","consensus_level":"medium","plddt":79.2986,"start":12,"end":260},{"cath_id":"3.30.60.20","chopping":"265-385","consensus_level":"medium","plddt":79.8683,"start":265,"end":385},{"cath_id":"3.40.50.10330","chopping":"424-551","consensus_level":"high","plddt":92.7904,"start":424,"end":551},{"cath_id":"2.60.200.40","chopping":"558-675_682-766","consensus_level":"high","plddt":87.6263,"start":558,"end":766}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P49619","model_url":"https://alphafold.ebi.ac.uk/files/AF-P49619-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P49619-F1-predicted_aligned_error_v6.png","plddt_mean":77.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DGKG","jax_strain_url":"https://www.jax.org/strain/search?query=DGKG"},"sequence":{"accession":"P49619","fasta_url":"https://rest.uniprot.org/uniprotkb/P49619.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P49619/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P49619"}},"corpus_meta":[{"pmid":"37838036","id":"PMC_37838036","title":"Endothelial 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genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10071200","citation_count":6,"is_preprint":false},{"pmid":"36092935","id":"PMC_36092935","title":"Comprehensive analysis reveals a 5-gene signature and immune cell infiltration in Alzheimer's disease with qPCR validation.","date":"2022","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36092935","citation_count":5,"is_preprint":false},{"pmid":"37509516","id":"PMC_37509516","title":"Role of Diacylglycerol Kinases in Acute Myeloid Leukemia.","date":"2023","source":"Biomedicines","url":"https://pubmed.ncbi.nlm.nih.gov/37509516","citation_count":5,"is_preprint":false},{"pmid":"38226611","id":"PMC_38226611","title":"PRADclass: Hybrid Gleason Grade-Informed Computational Strategy Identifies Consensus Biomarker Features Predictive of Aggressive Prostate Adenocarcinoma.","date":"2024","source":"Technology in cancer research & 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Yi xue ban = Journal of Sichuan University. Medical science edition","url":"https://pubmed.ncbi.nlm.nih.gov/38948296","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":20589,"output_tokens":1946,"usd":0.045478},"stage2":{"model":"claude-opus-4-6","input_tokens":5255,"output_tokens":1937,"usd":0.11205},"total_usd":0.157528,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2023,\n      \"finding\": \"Endothelial DGKG promotes tumor angiogenesis and immune evasion in HCC by recruiting ubiquitin specific peptidase 16 (USP16) to facilitate K48-linked deubiquitination and stabilization of ZEB2, leading to increased TGF-β1 secretion, which induces tumor angiogenesis and regulatory T-cell differentiation. HIF-1α directly binds the DGKG promoter under hypoxia to activate its transcription.\",\n      \"method\": \"Co-IP (USP16-DGKG-ZEB2 interaction), in vitro and in vivo functional studies (knockdown/overexpression), HIF-1α promoter binding assay, single-cell RNA-seq, CyTOF, flow cytometry, multiplexed IHC\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, in vivo mouse models, promoter binding, functional rescue) in a single study with strong mechanistic resolution\",\n      \"pmids\": [\"37838036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DGKγ (encoded by DGKG) suppresses colorectal cancer cell migration and invasion, and suppresses Rac1 activity. Notably, both kinase-dead and constitutively active DGKγ mutants retain inhibitory effects on proliferation, migration, invasion, and Rac1 activity, indicating a kinase-independent mechanism for some functions.\",\n      \"method\": \"Ectopic expression of wild-type, kinase-dead, and constitutively active DGKγ mutants in CRC cell lines; Rac1 activity assay; migration/invasion assays\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — active-site mutagenesis with functional readout in multiple cell-based assays; single lab\",\n      \"pmids\": [\"28218473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DGKG is expressed predominantly in somatostatin (SST)-expressing GABAergic interneurons in the cortex, and loss-of-function analysis in ganglionic eminence neurons demonstrates that Dgkg regulates neurite outgrowth of GABAergic neurons.\",\n      \"method\": \"FACS-array genome-wide screening, correlational gene expression analysis, functional knockdown in GE neurons with neurite outgrowth readout\",\n      \"journal\": \"Neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct loss-of-function with defined cellular phenotype (neurite outgrowth) in primary neurons; single lab\",\n      \"pmids\": [\"29203264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A hypoxia-induced alternatively spliced transcript of DGKG lacking exon 13 (DGKG-Δexon13) promotes glioblastoma cell proliferation, migration, and invasion more potently than wild-type DGKG. DGKG knockdown reduces these capacities in vitro and reduces tumor volume in vivo. DGKG-Δexon13 specifically regulates IL-16, CCN2, and EFNB3 expression.\",\n      \"method\": \"PCR-Sanger sequencing (splice variant verification), CCK-8 proliferation assay, Transwell and Matrigel-Transwell invasion assays, in vivo orthotopic GBM mouse model, transcriptome analysis\",\n      \"journal\": \"Oncology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal functional assays in vitro and in vivo; single lab\",\n      \"pmids\": [\"40296900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The human DAGK3 (DGKG) gene spans >30 kb with 23 introns and maps by FISH to chromosome 3q27-28. Mutational analysis of the full coding region in 19 OPA1 patients excluded DAGK3 as a causative gene for dominant optic atrophy despite its abundant retinal expression.\",\n      \"method\": \"Genomic sequencing (intron-exon organization), fluorescence in situ hybridization (chromosomal mapping), mutational analysis of patient cohort\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct genomic characterization and chromosomal mapping with functional exclusion via patient mutation screening\",\n      \"pmids\": [\"10071200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The DAGK3 (DGKG) gene, encoding a 90 kDa diacylglycerol kinase predominantly expressed in the retina, was localized by fluorescence in situ hybridization to human chromosome 3q27-28, with syntenic mapping of the mouse homolog to chromosome 16.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH), interspecific backcross panel mapping\",\n      \"journal\": \"Current eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct chromosomal localization by FISH with synteny confirmation in mouse\",\n      \"pmids\": [\"8585934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"An iPSC line was generated from a patient carrying a heterozygous DGKG mutation (c.2042G>A, p.R681Q) associated with epilepsy, providing a cellular model linking DGKG mutation to a neurological disorder.\",\n      \"method\": \"Non-integrating episomal vector iPSC reprogramming from patient PBMCs; genotyping\",\n      \"journal\": \"Stem cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — generation of a disease model cell line; no direct mechanistic assay on DGKG function performed\",\n      \"pmids\": [\"35421845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DGKG overexpression in oral squamous cell carcinoma (OSCC) cells enhances migration and invasion, identifying it as a functional contributor to OSCC progression.\",\n      \"method\": \"Overexpression functional assays (migration and invasion) in OSCC cell lines\",\n      \"journal\": \"BMC oral health\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single method (OE with phenotype), single lab, no pathway placement\",\n      \"pmids\": [\"40887599\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DGKG (diacylglycerol kinase gamma) encodes a retina-enriched lipid kinase that, in endothelial cells, is transcriptionally activated by HIF-1α under hypoxia and promotes tumor angiogenesis and immune evasion by recruiting USP16 to deubiquitinate and stabilize ZEB2, thereby increasing TGF-β1 secretion; in colorectal cancer cells it suppresses Rac1 activity and cell migration/invasion through both kinase-dependent and kinase-independent mechanisms; and in GABAergic interneurons it regulates neurite outgrowth, with a hypoxia-induced alternatively spliced isoform (Δexon13) further promoting glioblastoma proliferation and invasion.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DGKG encodes diacylglycerol kinase gamma, a retina-enriched lipid kinase that functions in lipid signaling, neuronal development, and tumor biology through both kinase-dependent and kinase-independent mechanisms. In endothelial cells, DGKG is transcriptionally activated by HIF-1α under hypoxia and promotes tumor angiogenesis and immune evasion by recruiting USP16 to deubiquitinate and stabilize ZEB2, increasing TGF-β1 secretion that drives regulatory T-cell differentiation [PMID:37838036]. In colorectal cancer cells, DGKG suppresses Rac1 activity, migration, and invasion through mechanisms that persist even with a kinase-dead mutant, indicating scaffolding or protein-interaction functions independent of its catalytic activity [PMID:28218473]. In SST-expressing GABAergic interneurons, DGKG regulates neurite outgrowth, and a hypoxia-induced splice variant lacking exon 13 promotes glioblastoma proliferation and invasion more potently than the wild-type protein [PMID:29203264, PMID:40296900].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Chromosomal mapping established the genomic identity and tissue-enrichment pattern of DGKG, placing it at 3q27-28 with predominant retinal expression, which focused subsequent functional studies on neural and vascular tissues.\",\n      \"evidence\": \"FISH mapping of human locus and interspecific backcross mapping of mouse homolog\",\n      \"pmids\": [\"8585934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No enzymatic characterization or substrate specificity analysis performed\",\n        \"Retinal function of DGKG not interrogated\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Full genomic characterization of DGKG (23 introns, >30 kb) and mutational screening in dominant optic atrophy patients excluded DGKG as the OPA1 disease gene, despite its retinal abundance.\",\n      \"evidence\": \"Genomic sequencing of intron-exon boundaries and mutation screening of 19 OPA1 patients\",\n      \"pmids\": [\"10071200\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No retinal loss-of-function phenotype studied\",\n        \"Only one disease cohort tested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Functional studies revealed that DGKG suppresses Rac1 activity, migration, and invasion in colorectal cancer cells, and crucially, kinase-dead mutants retained these inhibitory effects, establishing that DGKG possesses kinase-independent scaffolding or protein-interaction functions.\",\n      \"evidence\": \"Ectopic expression of wild-type, kinase-dead, and constitutively active mutants in CRC cell lines with Rac1 activity, migration, and invasion readouts\",\n      \"pmids\": [\"28218473\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The kinase-independent binding partner mediating Rac1 suppression is unidentified\",\n        \"Findings limited to overexpression in CRC lines; endogenous loss-of-function not shown\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Loss-of-function analysis in primary ganglionic eminence neurons demonstrated that DGKG regulates neurite outgrowth specifically in SST-expressing GABAergic interneurons, establishing a neuronal developmental role.\",\n      \"evidence\": \"FACS-array screening for cell-type expression followed by knockdown in GE neurons with neurite outgrowth quantification\",\n      \"pmids\": [\"29203264\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Downstream signaling pathway linking DGKG to neurite extension is undefined\",\n        \"In vivo interneuron phenotype not examined\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A comprehensive mechanistic study showed that endothelial DGKG, induced by HIF-1α under hypoxia, recruits USP16 to deubiquitinate ZEB2 (K48-linked), stabilizing it and increasing TGF-β1 secretion that drives tumor angiogenesis and regulatory T-cell differentiation — the first pathway-level mechanism for DGKG in the tumor microenvironment.\",\n      \"evidence\": \"Co-IP of USP16-DGKG-ZEB2 complex, HIF-1α promoter binding assay, knockdown/overexpression with in vivo HCC models, scRNA-seq, CyTOF, and flow cytometry\",\n      \"pmids\": [\"37838036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether the USP16-ZEB2 stabilization axis requires DGKG kinase activity is untested\",\n        \"Relevance beyond hepatocellular carcinoma endothelium not established\",\n        \"Structural basis for DGKG-USP16 interaction unknown\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A hypoxia-induced alternatively spliced DGKG isoform lacking exon 13 was identified as a more potent driver of glioblastoma proliferation and invasion than wild-type DGKG, with regulation of IL-16, CCN2, and EFNB3 expression, connecting hypoxia-responsive splicing to DGKG oncogenic gain-of-function.\",\n      \"evidence\": \"PCR-Sanger sequencing of splice variant, CCK-8 proliferation and Transwell invasion assays, orthotopic GBM mouse model, transcriptome analysis\",\n      \"pmids\": [\"40296900\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which exon 13 loss enhances pro-tumorigenic activity is unclear\",\n        \"The splicing factor(s) responsible for the Δexon13 switch under hypoxia are not identified\",\n        \"Whether the Δexon13 isoform retains kinase activity is not determined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for DGKG kinase-independent scaffolding functions, whether USP16 recruitment and Rac1 suppression share a common binding interface, the retinal function of DGKG, and how the Δexon13 splice variant gains enhanced oncogenic activity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of DGKG exists\",\n        \"Retinal loss-of-function phenotype has never been examined in vivo\",\n        \"Relationship between kinase-independent Rac1 suppression and USP16/ZEB2 stabilization mechanisms is unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"USP16\", \"ZEB2\", \"HIF1A\"],\n    \"other_free_text\": []\n  }\n}\n```"}