{"gene":"DLST","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":1990,"finding":"KGD2 (yeast ortholog of DLST) encodes the dihydrolipoyl transsuccinylase (KE2) component of the α-ketoglutarate dehydrogenase complex; disruption abolishes mitochondrial NAD+ reduction by α-ketoglutarate, establishing its essential catalytic role in the complex","method":"Gene disruption, complementation, enzymatic activity assay, sequence analysis showing 42% identity to E. coli KE2","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — genetic disruption with direct enzymatic activity readout, sequence-based functional assignment","pmids":["2115121"],"is_preprint":false},{"year":2003,"finding":"The DLST gene is bifunctional: a novel truncated protein (MIRTD), transcribed from intron 7 of DLST and localizing to the mitochondrial intermembrane space, is required for biogenesis of respiratory chain complexes I and IV via a post-translational mechanism","method":"Novel mRNA identification, subcellular fractionation/localization, maxizyme-mediated specific mRNA knockdown, pulse-label experiment, Western blot quantification of complex subunits and activity assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (localization, specific knockdown, pulse-label, activity assay) in a single study","pmids":["12805207"],"is_preprint":false},{"year":2009,"finding":"The DLST gene produces a ~30 kDa alternative splice variant (lacking exons 2 and 3, or exon 2, or exon 3) that localizes to the I bands of myofibrils in rat skeletal muscle, representing a protein with a distinct non-mitochondrial function","method":"Immunocytochemical staining with anti-DLST antibody, protein purification, amino acid sequencing, cDNA isolation and sequencing","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment with sequence validation, but single study","pmids":["19819302"],"is_preprint":false},{"year":2015,"finding":"Loss of DLST function in zebrafish (positional cloning of schneckentempo mutant) reduces ATP production and causes bradycardia due to defective cardiac pacemaker cell excitation, establishing DLST's role in heart rate regulation via mitochondrial ATP supply","method":"Forward genetic screen, positional cloning, gene knockdown, electrical pacing, ATP level measurement","journal":"Basic research in cardiology","confidence":"High","confidence_rationale":"Tier 2 — positional cloning plus knockdown validation with direct functional readout (ATP levels, electrophysiology)","pmids":["25697682"],"is_preprint":false},{"year":2016,"finding":"DLST, as the E2 transferase of the α-ketoglutarate dehydrogenase complex (KGDHC), converts α-KG to succinyl-CoA in the TCA cycle; its knockdown in human T-ALL cells accumulates α-KG and depletes succinyl-CoA, and succinate supplementation rescues viability, placing DLST as a required TCA cycle node for MYC-driven leukemogenesis","method":"RNAi knockdown, polar metabolomics profiling, succinate rescue experiment, zebrafish genetic model (heterozygous inactivation)","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 2 — metabolomics, genetic model, and rescue experiment provide orthogonal mechanistic evidence","pmids":["26876595"],"is_preprint":false},{"year":2019,"finding":"Germline DLST variant p.Gly374Glu causes loss of enzymatic function, triggers accumulation of 2-hydroxyglutarate in tumors and in heterologous cell-based assays, and is associated with pseudohypoxia (EPAS1-like methylation/expression profiles), linking DLST dysfunction to oncometabolite production and pheochromocytoma/paraganglioma susceptibility","method":"Targeted sequencing, 13C5-glutamate labeling assay, TCA metabolite determination, methylation profiling, heterologous cell-based functional assay, loss of heterozygosity analysis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1-2 — isotope tracing, cell-based enzymatic assay, and multi-omic profiling provide strong mechanistic evidence","pmids":["30929736"],"is_preprint":false},{"year":2021,"finding":"DLST depletion in MYCN-amplified neuroblastoma cells suppresses NADH production and impairs OXPHOS without substantially altering TCA cycle metabolites other than α-KG accumulation, demonstrating that DLST's primary contribution to tumor growth is through NADH/OXPHOS support rather than anaplerosis per se","method":"RNAi/shRNA depletion, metabolomics, NADH measurement, OXPHOS functional assays, zebrafish and mouse xenograft models","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (metabolomics, OXPHOS assays, in vivo models) replicate mechanistic findings","pmids":["34233924"],"is_preprint":false},{"year":2021,"finding":"DLST depletion in DLST-dependent TNBC cells increases reactive oxygen species (ROS) and disrupts TCA cycle and ROS-related pathways; N-acetyl-L-cysteine partially rescues growth, implicating ROS as a downstream mediator of DLST loss-of-function","method":"RNAi knockdown, metabolomics profiling, ROS measurement, N-acetyl-L-cysteine rescue experiment, in vivo tumor models","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 — metabolomics plus ROS rescue experiment provide mechanistic pathway placement","pmids":["34785772"],"is_preprint":false},{"year":2021,"finding":"DLST variants (p.Pro384Leu and compound heterozygous p.Gly374Glu/p.Thr383Ala) profoundly impact DLST enzyme activity and result in DNA hypermethylation in pheochromocytoma/paraganglioma tumor cells","method":"In silico predictions, functional enzyme activity assays, DNA methylation analysis, compound heterozygous variant characterization","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — enzyme activity assay and methylation analysis, single study","pmids":["33180916"],"is_preprint":false},{"year":2023,"finding":"Grpel2 physically interacts with DLST (shown by co-IP) and positively mediates the import of DLST into mitochondria under high-glucose conditions; DLST knockdown abrogates the protective effects of Grpel2 overexpression on mitochondrial function and cardiomyocyte survival in diabetic cardiomyopathy","method":"Co-immunoprecipitation, siRNA knockdown, mitochondrial import assay (overexpression rescue), ROS/membrane potential/respiratory capacity measurements","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP plus functional epistasis, single study","pmids":["36927450"],"is_preprint":false},{"year":2023,"finding":"lncRNA MEG3 binds DLST protein (shown by RNA pulldown and RIP-qPCR) and stabilizes DLST protein post-translationally (MEG3 overexpression increases DLST protein without changing mRNA); DLST promotes porcine satellite cell (skeletal muscle) differentiation, and the MYOD→MEG3→DLST axis regulates myogenesis","method":"RNA pulldown, RIP-qPCR, knockdown/overexpression experiments, rescue assays, ChIP and luciferase reporter for MYOD binding to MEG3 promoter, in vivo knockdown","journal":"Epigenetics","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct RNA-protein binding assay plus functional rescue, though porcine model","pmids":["37506369"],"is_preprint":false},{"year":2024,"finding":"EPC1/2 regulate DLST expression through histone H3 acetylation, cooperating with transcription factors SRF and FOXR2, and DLST links EPC1/2 function to mitochondrial metabolism in hematopoietic stem and progenitor cell (HSPC) proliferation","method":"Zebrafish genetic depletion of EPC1/2, ChIP-based H3 acetylation analysis, gene expression profiling in K562 cells","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic model with chromatin and expression data, but DLST's mechanistic role is inferred downstream","pmids":["38439957"],"is_preprint":false},{"year":2025,"finding":"lncRNA APCDD1L-AS1 forms a complex with DLST protein and prevents its ubiquitination and proteasomal degradation, thereby stabilizing DLST and driving TCA cycle activity to promote osimertinib resistance in lung adenocarcinoma; HIF-1α transcriptionally activates APCDD1L-AS1 under hypoxia","method":"Co-IP/complex formation assay, ubiquitination assay, knockdown/overexpression, luciferase reporter for HIF-1α binding, in vitro and in vivo drug resistance models","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2-3 — ubiquitination assay and co-IP with functional validation, single study","pmids":["40634956"],"is_preprint":false},{"year":2026,"finding":"DLST knockdown in osteosarcoma cells inhibits proliferation, migration, invasion, and promotes apoptosis; RNA-seq and pharmacological inhibition revealed DLST regulates the p38 MAPK signaling pathway, with p38 MAPK inhibition reversing malignant phenotypes caused by DLST knockdown","method":"RNAi knockdown, RNA-seq, p38 MAPK inhibitor rescue, CCK-8/colony/transwell/flow cytometry assays, in vivo xenograft","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — RNA-seq with pharmacological epistasis, single study","pmids":["41616466"],"is_preprint":false},{"year":2025,"finding":"Under glutamine deficiency, DLST (along with OGDH) translocates to the nucleus in muscle progenitor cells, leading to elevated histone succinylation and restricted chromatin accessibility at the MyoD1 locus, impairing myogenesis","method":"Confocal imaging of nuclear localization, succinyl-proteomics, single-cell nuclei ATAC-seq, cell proliferation/cycle assays","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 2 — preprint, single study with nuclear localization and epigenetic readout but not yet peer-reviewed","pmids":["bio_10.1101_2025.05.30.657066"],"is_preprint":true}],"current_model":"DLST is the E2 dihydrolipoyl succinyltransferase subunit of the mitochondrial α-ketoglutarate dehydrogenase complex (KGDHC), catalyzing conversion of α-KG to succinyl-CoA and producing NADH for oxidative phosphorylation; beyond this core TCA cycle function, the DLST gene is bifunctional—producing a truncated MIRTD protein required for respiratory chain biogenesis, and alternative splice variants localizing to myofibril I bands—while DLST protein stability is regulated by lncRNA interactions (MEG3, APCDD1L-AS1) that prevent its ubiquitination, its mitochondrial import is facilitated by Grpel2, its expression is controlled by histone H3 acetylation via EPC1/2, and loss-of-function mutations cause oncometabolite (2-hydroxyglutarate) accumulation and DNA hypermethylation underlying pheochromocytoma/paraganglioma susceptibility."},"narrative":{"teleology":[{"year":1990,"claim":"Establishing the core catalytic identity of DLST: disruption of the yeast ortholog KGD2 abolished α-ketoglutarate-dependent mitochondrial NAD⁺ reduction, proving DLST encodes the E2 transsuccinylase essential for KGDHC activity.","evidence":"Gene disruption, complementation, and enzymatic activity assay in yeast","pmids":["2115121"],"confidence":"High","gaps":["Mammalian DLST function not yet directly demonstrated","Structural basis of transsuccinylation not resolved","Regulatory mechanisms unknown"]},{"year":2003,"claim":"Revealing that the DLST locus is bifunctional: a truncated protein (MIRTD), transcribed from intron 7, localizes to the mitochondrial intermembrane space and is required for respiratory chain complexes I and IV biogenesis, showing DLST contributes to OXPHOS beyond its TCA cycle role.","evidence":"Specific mRNA knockdown by maxizymes, pulse-label experiments, subcellular fractionation, and complex activity assays in human cells","pmids":["12805207"],"confidence":"High","gaps":["Mechanism by which MIRTD promotes complex I/IV assembly unknown","Whether MIRTD acts as a chaperone, assembly factor, or import mediator not determined"]},{"year":2009,"claim":"Demonstrating that DLST splice variants have non-mitochondrial functions: a ~30 kDa isoform lacking exons 2–3 localizes to myofibril I bands in skeletal muscle, suggesting a structural or regulatory role at the sarcomere.","evidence":"Immunocytochemistry, protein purification, amino acid sequencing, and cDNA cloning from rat skeletal muscle","pmids":["19819302"],"confidence":"Medium","gaps":["Function of the myofibrillar isoform not determined","Single study in rat tissue without genetic confirmation","Whether this isoform exists in human muscle unknown"]},{"year":2015,"claim":"Linking DLST to cardiac physiology: positional cloning of a zebrafish bradycardia mutant mapped to DLST, showing that DLST loss reduces ATP production and impairs pacemaker cell excitation, establishing an in vivo physiological role for KGDHC-derived ATP in heart rate regulation.","evidence":"Forward genetic screen, positional cloning, gene knockdown, ATP measurement, and electrical pacing in zebrafish","pmids":["25697682"],"confidence":"High","gaps":["Whether cardiac phenotype is specific to DLST or general KGDHC deficiency not distinguished","Mammalian cardiac phenotype of DLST loss not established"]},{"year":2016,"claim":"Placing DLST as a metabolic vulnerability in cancer: knockdown in MYC-driven T-ALL cells accumulated α-KG and depleted succinyl-CoA, and succinate rescue confirmed the TCA cycle bottleneck, demonstrating DLST is a required metabolic node for certain oncogene-driven tumors.","evidence":"RNAi knockdown, polar metabolomics, succinate rescue, and zebrafish genetic model in human T-ALL cells","pmids":["26876595"],"confidence":"High","gaps":["Whether DLST dependency generalizes beyond MYC-driven contexts not clear","Therapeutic targeting strategy not developed"]},{"year":2019,"claim":"Establishing DLST as a pheochromocytoma/paraganglioma susceptibility gene: the germline p.Gly374Glu variant abolished DLST enzymatic function and caused accumulation of the oncometabolite 2-hydroxyglutarate with pseudohypoxic DNA methylation profiles, mechanistically linking DLST loss-of-function to tumorigenesis.","evidence":"¹³C₅-glutamate isotope tracing, cell-based enzyme assay, TCA metabolite profiling, DNA methylation analysis, and LOH analysis in patient tumors","pmids":["30929736"],"confidence":"High","gaps":["Penetrance and genotype-phenotype correlations for different DLST variants not established","Source of 2-HG production (enzymatic versus non-enzymatic) not fully resolved"]},{"year":2021,"claim":"Dissecting the downstream consequence of DLST loss in tumors: DLST depletion in MYCN-amplified neuroblastoma primarily impaired NADH production and OXPHOS rather than anaplerosis, while in TNBC cells DLST loss elevated ROS as a key mediator of growth inhibition, clarifying tissue-specific metabolic consequences.","evidence":"shRNA depletion, metabolomics, NADH/OXPHOS measurements, ROS assays, NAC rescue, and in vivo xenograft models across neuroblastoma and TNBC cell lines","pmids":["34233924","34785772"],"confidence":"High","gaps":["Whether NADH versus ROS mechanisms are context-dependent or coexistent not resolved","Specific ROS species and downstream signaling pathways not fully characterized"]},{"year":2021,"claim":"Extending the disease genetics: additional DLST variants (p.Pro384Leu, compound heterozygous p.Gly374Glu/p.Thr383Ala) were shown to impair enzymatic activity and produce DNA hypermethylation, confirming that multiple loss-of-function alleles converge on the same pathogenic mechanism in pheochromocytoma/paraganglioma.","evidence":"Functional enzyme activity assays and DNA methylation profiling of patient-derived tumor samples","pmids":["33180916"],"confidence":"Medium","gaps":["Structural basis for why these specific residues are critical not determined","Animal models recapitulating DLST-driven PPGL not available"]},{"year":2023,"claim":"Identifying regulators of DLST protein stability and mitochondrial import: Grpel2 physically interacts with DLST and promotes its mitochondrial import under high-glucose conditions, while lncRNA MEG3 binds DLST protein and prevents its degradation, revealing post-translational control layers for DLST abundance.","evidence":"Co-IP, mitochondrial import assays, RNA pulldown, RIP-qPCR, knockdown/overexpression rescue in cardiomyocytes and porcine satellite cells","pmids":["36927450","37506369"],"confidence":"Medium","gaps":["Ubiquitin ligase(s) targeting DLST not identified","Whether Grpel2-DLST interaction is direct or complex-mediated not resolved","Grpel2 interaction validated by co-IP only without reciprocal pull-down"]},{"year":2024,"claim":"Connecting DLST transcriptional control to chromatin regulation: EPC1/2 promote DLST expression via histone H3 acetylation in cooperation with SRF and FOXR2, linking epigenetic regulators to mitochondrial metabolism in hematopoietic stem and progenitor cell proliferation.","evidence":"Zebrafish EPC1/2 depletion, ChIP-based H3 acetylation analysis, gene expression profiling in K562 cells","pmids":["38439957"],"confidence":"Medium","gaps":["Whether EPC1/2 directly binds the DLST promoter not confirmed","DLST's specific role in HSPC biology is inferred rather than directly tested"]},{"year":2025,"claim":"Expanding DLST's post-translational regulation: lncRNA APCDD1L-AS1, transcriptionally activated by HIF-1α under hypoxia, binds DLST protein and prevents its ubiquitination and proteasomal degradation, thereby sustaining TCA cycle flux to drive osimertinib resistance in lung adenocarcinoma.","evidence":"Co-IP/complex formation, ubiquitination assay, knockdown/overexpression, luciferase reporter, in vivo drug resistance models","pmids":["40634956"],"confidence":"Medium","gaps":["Identity of the E3 ubiquitin ligase for DLST still unknown","Whether APCDD1L-AS1 blocks a specific ubiquitin site on DLST not determined","Single study without independent replication"]},{"year":null,"claim":"Key unresolved questions include the identity of the E3 ubiquitin ligase(s) targeting DLST for degradation, the molecular mechanism by which MIRTD promotes respiratory chain complex assembly, and whether nuclear translocation of DLST under nutrient stress represents a physiologically important epigenetic regulatory mechanism.","evidence":"","pmids":[],"confidence":"Low","gaps":["E3 ligase for DLST not identified","MIRTD mechanism of action in complex I/IV assembly unknown","Nuclear DLST and histone succinylation link requires peer-reviewed confirmation","Structural basis of DLST catalysis and disease variants not resolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,4,5]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,3,4,9]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,4,5,6,7,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[5,8]}],"complexes":["α-ketoglutarate dehydrogenase complex (KGDHC)"],"partners":["OGDH","DLD","GRPEL2","MEG3","APCDD1L-AS1"],"other_free_text":[]},"mechanistic_narrative":"DLST encodes the E2 dihydrolipoyl succinyltransferase subunit of the mitochondrial α-ketoglutarate dehydrogenase complex (KGDHC), catalyzing the conversion of α-ketoglutarate to succinyl-CoA in the TCA cycle and generating NADH for oxidative phosphorylation [PMID:2115121, PMID:26876595, PMID:34233924]. The DLST locus is bifunctional: in addition to the full-length E2 enzyme, an alternative transcript from intron 7 encodes MIRTD, a truncated protein localizing to the mitochondrial intermembrane space that is required for biogenesis of respiratory chain complexes I and IV [PMID:12805207], and further splice variants produce a ~30 kDa isoform that localizes to myofibril I bands in skeletal muscle [PMID:19819302]. DLST protein stability is regulated post-translationally by lncRNAs (MEG3, APCDD1L-AS1) that bind DLST and prevent its ubiquitin-dependent proteasomal degradation [PMID:37506369, PMID:40634956], and its mitochondrial import is facilitated by the co-chaperone Grpel2 [PMID:36927450]. Germline loss-of-function DLST mutations cause accumulation of the oncometabolite 2-hydroxyglutarate and DNA hypermethylation, establishing DLST as a susceptibility gene for pheochromocytoma and paraganglioma [PMID:30929736, PMID:33180916]."},"prefetch_data":{"uniprot":{"accession":"P36957","full_name":"Dihydrolipoyllysine-residue succinyltransferase component of 2-oxoglutarate dehydrogenase complex, mitochondrial","aliases":["2-oxoglutarate dehydrogenase complex component E2","OGDC-E2","Dihydrolipoamide succinyltransferase component of 2-oxoglutarate dehydrogenase complex","E2K"],"length_aa":453,"mass_kda":48.8,"function":"Dihydrolipoamide succinyltransferase (E2) component of the 2-oxoglutarate dehydrogenase complex. The 2-oxoglutarate dehydrogenase complex catalyzes the overall conversion of 2-oxoglutarate to succinyl-CoA and CO(2). The 2-oxoglutarate dehydrogenase complex is mainly active in the mitochondrion (PubMed:29211711, PubMed:30929736). A fraction of the 2-oxoglutarate dehydrogenase complex also localizes in the nucleus and is required for lysine succinylation of histones: associates with KAT2A on chromatin and provides succinyl-CoA to histone succinyltransferase KAT2A (PubMed:29211711)","subcellular_location":"Mitochondrion matrix; Nucleus","url":"https://www.uniprot.org/uniprotkb/P36957/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DLST","classification":"Not Classified","n_dependent_lines":375,"n_total_lines":1208,"dependency_fraction":0.31043046357615894},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DLST","total_profiled":1310},"omim":[{"mim_id":"618475","title":"PHEOCHROMOCYTOMA/PARAGANGLIOMA SYNDROME 7; PPGL7","url":"https://www.omim.org/entry/618475"},{"mim_id":"613022","title":"OXOGLUTARATE DEHYDROGENASE; OGDH","url":"https://www.omim.org/entry/613022"},{"mim_id":"610284","title":"LIPOYLTRANSFERASE 1; LIPT1","url":"https://www.omim.org/entry/610284"},{"mim_id":"168000","title":"PHEOCHROMOCYTOMA/PARAGANGLIOMA SYNDROME 1; PPGL1","url":"https://www.omim.org/entry/168000"},{"mim_id":"126063","title":"DIHYDROLIPOAMIDE S-SUCCINYLTRANSFERASE; DLST","url":"https://www.omim.org/entry/126063"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Mitochondria","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DLST"},"hgnc":{"alias_symbol":["OGDC-E2","KGD2"],"prev_symbol":["DLTS"]},"alphafold":{"accession":"P36957","domains":[{"cath_id":"2.40.50.100","chopping":"70-144","consensus_level":"high","plddt":82.7177,"start":70,"end":144},{"cath_id":"3.30.559.10","chopping":"232-450","consensus_level":"high","plddt":94.0127,"start":232,"end":450}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P36957","model_url":"https://alphafold.ebi.ac.uk/files/AF-P36957-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P36957-F1-predicted_aligned_error_v6.png","plddt_mean":76.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DLST","jax_strain_url":"https://www.jax.org/strain/search?query=DLST"},"sequence":{"accession":"P36957","fasta_url":"https://rest.uniprot.org/uniprotkb/P36957.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P36957/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P36957"}},"corpus_meta":[{"pmid":"2115121","id":"PMC_2115121","title":"Structure and regulation of KGD2, the structural gene for yeast dihydrolipoyl transsuccinylase.","date":"1990","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/2115121","citation_count":55,"is_preprint":false},{"pmid":"34233924","id":"PMC_34233924","title":"Metabolic Enzyme DLST Promotes Tumor Aggression and Reveals a Vulnerability to OXPHOS Inhibition in High-Risk Neuroblastoma.","date":"2021","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/34233924","citation_count":51,"is_preprint":false},{"pmid":"26876595","id":"PMC_26876595","title":"The TCA cycle transferase DLST is important for MYC-mediated leukemogenesis.","date":"2016","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/26876595","citation_count":50,"is_preprint":false},{"pmid":"34785772","id":"PMC_34785772","title":"DLST-dependence dictates metabolic heterogeneity in TCA-cycle usage among triple-negative breast cancer.","date":"2021","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/34785772","citation_count":49,"is_preprint":false},{"pmid":"30929736","id":"PMC_30929736","title":"Recurrent Germline DLST Mutations in Individuals with Multiple Pheochromocytomas and Paragangliomas.","date":"2019","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30929736","citation_count":48,"is_preprint":false},{"pmid":"9894876","id":"PMC_9894876","title":"Modulation by DLST of the genetic risk of Alzheimer's disease in a very elderly population.","date":"1999","source":"Annals of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/9894876","citation_count":35,"is_preprint":false},{"pmid":"25697682","id":"PMC_25697682","title":"Loss of dihydrolipoyl succinyltransferase (DLST) leads to reduced resting heart rate in the zebrafish.","date":"2015","source":"Basic research in 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DLST.","date":"2023","source":"Epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/37506369","citation_count":7,"is_preprint":false},{"pmid":"36927450","id":"PMC_36927450","title":"Grpel2 maintains cardiomyocyte survival in diabetic cardiomyopathy through DLST-mediated mitochondrial dysfunction: a proof-of-concept study.","date":"2023","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36927450","citation_count":7,"is_preprint":false},{"pmid":"31087708","id":"PMC_31087708","title":"Rno-miR-425-5p targets the DLST and SLC16A1 genes to reduce liver damage caused by excessive energy mobilization under cold stress.","date":"2019","source":"Journal of animal physiology and animal nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/31087708","citation_count":7,"is_preprint":false},{"pmid":"16531715","id":"PMC_16531715","title":"[DLST as a method for detecting TS-1-induced allergy].","date":"2006","source":"Gan to kagaku ryoho. Cancer & chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/16531715","citation_count":7,"is_preprint":false},{"pmid":"38439957","id":"PMC_38439957","title":"EPC1/2 regulate hematopoietic stem and progenitor cell proliferation by modulating H3 acetylation and DLST.","date":"2024","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/38439957","citation_count":6,"is_preprint":false},{"pmid":"30214536","id":"PMC_30214536","title":"Association of OGG1 and DLST promoter methylation with Alzheimer's disease in Xinjiang population.","date":"2018","source":"Experimental and therapeutic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/30214536","citation_count":4,"is_preprint":false},{"pmid":"40634956","id":"PMC_40634956","title":"Hypoxia-inducible APCDD1L-AS1 promotes osimertinib resistance by stabilising DLST to drive tricarboxylic acid cycle in lung adenocarcinoma.","date":"2025","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/40634956","citation_count":3,"is_preprint":false},{"pmid":"11825528","id":"PMC_11825528","title":"[Association between DLST gene polymorphism and Alzheimer's disease].","date":"2001","source":"Zhonghua yi xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/11825528","citation_count":3,"is_preprint":false},{"pmid":"37464884","id":"PMC_37464884","title":"Evolutionary trajectories of beta-lactamase NDM and DLST cluster in Pseudomonas aeruginosa: finding the putative ancestor.","date":"2023","source":"Pathogens and global health","url":"https://pubmed.ncbi.nlm.nih.gov/37464884","citation_count":2,"is_preprint":false},{"pmid":"41207382","id":"PMC_41207382","title":"Recommendations for Defining Chimeric Antigen Receptor T-Cell (CAR T) Dose-Limiting Toxicities (DLTs) for Future Early-Phase CAR T Therapy Studies.","date":"2025","source":"Transplantation and cellular therapy","url":"https://pubmed.ncbi.nlm.nih.gov/41207382","citation_count":1,"is_preprint":false},{"pmid":"36634214","id":"PMC_36634214","title":"Candidate drugs associated with sensitivity of cancer cell lines with DLST amplification or high mRNA levels.","date":"2023","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/36634214","citation_count":1,"is_preprint":false},{"pmid":"19819302","id":"PMC_19819302","title":"A novel protein found in the I bands of myofibrils is produced by alternative splicing of the DLST gene.","date":"2009","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/19819302","citation_count":1,"is_preprint":false},{"pmid":"38835385","id":"PMC_38835385","title":"Case report: A rare DLST mutation in patient with metastatic pheochromocytoma: clinical implications and management challenges.","date":"2024","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/38835385","citation_count":1,"is_preprint":false},{"pmid":"41616466","id":"PMC_41616466","title":"DLST mediates the malignant progression of osteosarcoma cells by regulating the p38 MAPK signaling pathway.","date":"2026","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/41616466","citation_count":0,"is_preprint":false},{"pmid":"41593675","id":"PMC_41593675","title":"Elevated miR-409-5p may promote the progression of osteoarthritis by targeting DLST as a potential biomarker function of miR-409-5p in osteoarthritis.","date":"2026","source":"Journal of orthopaedic surgery and research","url":"https://pubmed.ncbi.nlm.nih.gov/41593675","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.21.25324369","title":"Significance of the drug-induced lymphocyte stimulation test for various oral mesalamines in ulcerative colitis with mesalamine intolerance","date":"2025-03-23","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.21.25324369","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.02.25328445","title":"A first-in-human, Phase 1/2a, open-label study of SQ3370, a first-in-class doxorubicin-based click chemistry therapeutic, in patients with advanced solid tumors","date":"2025-06-03","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.02.25328445","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.11.612515","title":"Protein identification using cryo-EM and artificial intelligence guides improved sample purification","date":"2024-09-12","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.11.612515","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.05.30.657066","title":"Glutamine deficiency enhances nuclear localization of TCA cycle enzymes and epigenetic modifications, impairing myogenesis","date":"2025-06-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.30.657066","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.09.25329141","title":"Optimal dose and safety of intravenous favipiravir in hospitalised patients with SARS-CoV-2 infection: a Phase Ib, open-label, dose-escalating, randomised controlled study","date":"2025-06-09","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.09.25329141","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.11.07.24316829","title":"A Phase Ib/II multi-arm, dose finding and expansion study of a novel thymidylate synthase inhibitor with immune modulating properties, NUC-3373, in combination with pembrolizumab or docetaxel in patients with advanced solid tumors (NuTide:303)","date":"2024-11-08","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.07.24316829","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.06.25.24309146","title":"Sequential intravenous and intracerebroventricular GD2-CAR T-cell therapy for H3K27M-mutated diffuse midline gliomas","date":"2024-06-27","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.25.24309146","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21222,"output_tokens":3570,"usd":0.058608},"stage2":{"model":"claude-opus-4-6","input_tokens":7020,"output_tokens":3140,"usd":0.1704},"total_usd":0.229008,"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\": 1990,\n      \"finding\": \"KGD2 (yeast ortholog of DLST) encodes the dihydrolipoyl transsuccinylase (KE2) component of the α-ketoglutarate dehydrogenase complex; disruption abolishes mitochondrial NAD+ reduction by α-ketoglutarate, establishing its essential catalytic role in the complex\",\n      \"method\": \"Gene disruption, complementation, enzymatic activity assay, sequence analysis showing 42% identity to E. coli KE2\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — genetic disruption with direct enzymatic activity readout, sequence-based functional assignment\",\n      \"pmids\": [\"2115121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The DLST gene is bifunctional: a novel truncated protein (MIRTD), transcribed from intron 7 of DLST and localizing to the mitochondrial intermembrane space, is required for biogenesis of respiratory chain complexes I and IV via a post-translational mechanism\",\n      \"method\": \"Novel mRNA identification, subcellular fractionation/localization, maxizyme-mediated specific mRNA knockdown, pulse-label experiment, Western blot quantification of complex subunits and activity assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (localization, specific knockdown, pulse-label, activity assay) in a single study\",\n      \"pmids\": [\"12805207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The DLST gene produces a ~30 kDa alternative splice variant (lacking exons 2 and 3, or exon 2, or exon 3) that localizes to the I bands of myofibrils in rat skeletal muscle, representing a protein with a distinct non-mitochondrial function\",\n      \"method\": \"Immunocytochemical staining with anti-DLST antibody, protein purification, amino acid sequencing, cDNA isolation and sequencing\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with sequence validation, but single study\",\n      \"pmids\": [\"19819302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss of DLST function in zebrafish (positional cloning of schneckentempo mutant) reduces ATP production and causes bradycardia due to defective cardiac pacemaker cell excitation, establishing DLST's role in heart rate regulation via mitochondrial ATP supply\",\n      \"method\": \"Forward genetic screen, positional cloning, gene knockdown, electrical pacing, ATP level measurement\",\n      \"journal\": \"Basic research in cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — positional cloning plus knockdown validation with direct functional readout (ATP levels, electrophysiology)\",\n      \"pmids\": [\"25697682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DLST, as the E2 transferase of the α-ketoglutarate dehydrogenase complex (KGDHC), converts α-KG to succinyl-CoA in the TCA cycle; its knockdown in human T-ALL cells accumulates α-KG and depletes succinyl-CoA, and succinate supplementation rescues viability, placing DLST as a required TCA cycle node for MYC-driven leukemogenesis\",\n      \"method\": \"RNAi knockdown, polar metabolomics profiling, succinate rescue experiment, zebrafish genetic model (heterozygous inactivation)\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — metabolomics, genetic model, and rescue experiment provide orthogonal mechanistic evidence\",\n      \"pmids\": [\"26876595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Germline DLST variant p.Gly374Glu causes loss of enzymatic function, triggers accumulation of 2-hydroxyglutarate in tumors and in heterologous cell-based assays, and is associated with pseudohypoxia (EPAS1-like methylation/expression profiles), linking DLST dysfunction to oncometabolite production and pheochromocytoma/paraganglioma susceptibility\",\n      \"method\": \"Targeted sequencing, 13C5-glutamate labeling assay, TCA metabolite determination, methylation profiling, heterologous cell-based functional assay, loss of heterozygosity analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — isotope tracing, cell-based enzymatic assay, and multi-omic profiling provide strong mechanistic evidence\",\n      \"pmids\": [\"30929736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DLST depletion in MYCN-amplified neuroblastoma cells suppresses NADH production and impairs OXPHOS without substantially altering TCA cycle metabolites other than α-KG accumulation, demonstrating that DLST's primary contribution to tumor growth is through NADH/OXPHOS support rather than anaplerosis per se\",\n      \"method\": \"RNAi/shRNA depletion, metabolomics, NADH measurement, OXPHOS functional assays, zebrafish and mouse xenograft models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (metabolomics, OXPHOS assays, in vivo models) replicate mechanistic findings\",\n      \"pmids\": [\"34233924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DLST depletion in DLST-dependent TNBC cells increases reactive oxygen species (ROS) and disrupts TCA cycle and ROS-related pathways; N-acetyl-L-cysteine partially rescues growth, implicating ROS as a downstream mediator of DLST loss-of-function\",\n      \"method\": \"RNAi knockdown, metabolomics profiling, ROS measurement, N-acetyl-L-cysteine rescue experiment, in vivo tumor models\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — metabolomics plus ROS rescue experiment provide mechanistic pathway placement\",\n      \"pmids\": [\"34785772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DLST variants (p.Pro384Leu and compound heterozygous p.Gly374Glu/p.Thr383Ala) profoundly impact DLST enzyme activity and result in DNA hypermethylation in pheochromocytoma/paraganglioma tumor cells\",\n      \"method\": \"In silico predictions, functional enzyme activity assays, DNA methylation analysis, compound heterozygous variant characterization\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — enzyme activity assay and methylation analysis, single study\",\n      \"pmids\": [\"33180916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Grpel2 physically interacts with DLST (shown by co-IP) and positively mediates the import of DLST into mitochondria under high-glucose conditions; DLST knockdown abrogates the protective effects of Grpel2 overexpression on mitochondrial function and cardiomyocyte survival in diabetic cardiomyopathy\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, mitochondrial import assay (overexpression rescue), ROS/membrane potential/respiratory capacity measurements\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP plus functional epistasis, single study\",\n      \"pmids\": [\"36927450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"lncRNA MEG3 binds DLST protein (shown by RNA pulldown and RIP-qPCR) and stabilizes DLST protein post-translationally (MEG3 overexpression increases DLST protein without changing mRNA); DLST promotes porcine satellite cell (skeletal muscle) differentiation, and the MYOD→MEG3→DLST axis regulates myogenesis\",\n      \"method\": \"RNA pulldown, RIP-qPCR, knockdown/overexpression experiments, rescue assays, ChIP and luciferase reporter for MYOD binding to MEG3 promoter, in vivo knockdown\",\n      \"journal\": \"Epigenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct RNA-protein binding assay plus functional rescue, though porcine model\",\n      \"pmids\": [\"37506369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EPC1/2 regulate DLST expression through histone H3 acetylation, cooperating with transcription factors SRF and FOXR2, and DLST links EPC1/2 function to mitochondrial metabolism in hematopoietic stem and progenitor cell (HSPC) proliferation\",\n      \"method\": \"Zebrafish genetic depletion of EPC1/2, ChIP-based H3 acetylation analysis, gene expression profiling in K562 cells\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic model with chromatin and expression data, but DLST's mechanistic role is inferred downstream\",\n      \"pmids\": [\"38439957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"lncRNA APCDD1L-AS1 forms a complex with DLST protein and prevents its ubiquitination and proteasomal degradation, thereby stabilizing DLST and driving TCA cycle activity to promote osimertinib resistance in lung adenocarcinoma; HIF-1α transcriptionally activates APCDD1L-AS1 under hypoxia\",\n      \"method\": \"Co-IP/complex formation assay, ubiquitination assay, knockdown/overexpression, luciferase reporter for HIF-1α binding, in vitro and in vivo drug resistance models\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ubiquitination assay and co-IP with functional validation, single study\",\n      \"pmids\": [\"40634956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DLST knockdown in osteosarcoma cells inhibits proliferation, migration, invasion, and promotes apoptosis; RNA-seq and pharmacological inhibition revealed DLST regulates the p38 MAPK signaling pathway, with p38 MAPK inhibition reversing malignant phenotypes caused by DLST knockdown\",\n      \"method\": \"RNAi knockdown, RNA-seq, p38 MAPK inhibitor rescue, CCK-8/colony/transwell/flow cytometry assays, in vivo xenograft\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — RNA-seq with pharmacological epistasis, single study\",\n      \"pmids\": [\"41616466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Under glutamine deficiency, DLST (along with OGDH) translocates to the nucleus in muscle progenitor cells, leading to elevated histone succinylation and restricted chromatin accessibility at the MyoD1 locus, impairing myogenesis\",\n      \"method\": \"Confocal imaging of nuclear localization, succinyl-proteomics, single-cell nuclei ATAC-seq, cell proliferation/cycle assays\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 — preprint, single study with nuclear localization and epigenetic readout but not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.05.30.657066\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DLST is the E2 dihydrolipoyl succinyltransferase subunit of the mitochondrial α-ketoglutarate dehydrogenase complex (KGDHC), catalyzing conversion of α-KG to succinyl-CoA and producing NADH for oxidative phosphorylation; beyond this core TCA cycle function, the DLST gene is bifunctional—producing a truncated MIRTD protein required for respiratory chain biogenesis, and alternative splice variants localizing to myofibril I bands—while DLST protein stability is regulated by lncRNA interactions (MEG3, APCDD1L-AS1) that prevent its ubiquitination, its mitochondrial import is facilitated by Grpel2, its expression is controlled by histone H3 acetylation via EPC1/2, and loss-of-function mutations cause oncometabolite (2-hydroxyglutarate) accumulation and DNA hypermethylation underlying pheochromocytoma/paraganglioma susceptibility.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DLST encodes the E2 dihydrolipoyl succinyltransferase subunit of the mitochondrial α-ketoglutarate dehydrogenase complex (KGDHC), catalyzing the conversion of α-ketoglutarate to succinyl-CoA in the TCA cycle and generating NADH for oxidative phosphorylation [PMID:2115121, PMID:26876595, PMID:34233924]. The DLST locus is bifunctional: in addition to the full-length E2 enzyme, an alternative transcript from intron 7 encodes MIRTD, a truncated protein localizing to the mitochondrial intermembrane space that is required for biogenesis of respiratory chain complexes I and IV [PMID:12805207], and further splice variants produce a ~30 kDa isoform that localizes to myofibril I bands in skeletal muscle [PMID:19819302]. DLST protein stability is regulated post-translationally by lncRNAs (MEG3, APCDD1L-AS1) that bind DLST and prevent its ubiquitin-dependent proteasomal degradation [PMID:37506369, PMID:40634956], and its mitochondrial import is facilitated by the co-chaperone Grpel2 [PMID:36927450]. Germline loss-of-function DLST mutations cause accumulation of the oncometabolite 2-hydroxyglutarate and DNA hypermethylation, establishing DLST as a susceptibility gene for pheochromocytoma and paraganglioma [PMID:30929736, PMID:33180916].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing the core catalytic identity of DLST: disruption of the yeast ortholog KGD2 abolished α-ketoglutarate-dependent mitochondrial NAD⁺ reduction, proving DLST encodes the E2 transsuccinylase essential for KGDHC activity.\",\n      \"evidence\": \"Gene disruption, complementation, and enzymatic activity assay in yeast\",\n      \"pmids\": [\"2115121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian DLST function not yet directly demonstrated\", \"Structural basis of transsuccinylation not resolved\", \"Regulatory mechanisms unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Revealing that the DLST locus is bifunctional: a truncated protein (MIRTD), transcribed from intron 7, localizes to the mitochondrial intermembrane space and is required for respiratory chain complexes I and IV biogenesis, showing DLST contributes to OXPHOS beyond its TCA cycle role.\",\n      \"evidence\": \"Specific mRNA knockdown by maxizymes, pulse-label experiments, subcellular fractionation, and complex activity assays in human cells\",\n      \"pmids\": [\"12805207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which MIRTD promotes complex I/IV assembly unknown\", \"Whether MIRTD acts as a chaperone, assembly factor, or import mediator not determined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating that DLST splice variants have non-mitochondrial functions: a ~30 kDa isoform lacking exons 2–3 localizes to myofibril I bands in skeletal muscle, suggesting a structural or regulatory role at the sarcomere.\",\n      \"evidence\": \"Immunocytochemistry, protein purification, amino acid sequencing, and cDNA cloning from rat skeletal muscle\",\n      \"pmids\": [\"19819302\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Function of the myofibrillar isoform not determined\", \"Single study in rat tissue without genetic confirmation\", \"Whether this isoform exists in human muscle unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linking DLST to cardiac physiology: positional cloning of a zebrafish bradycardia mutant mapped to DLST, showing that DLST loss reduces ATP production and impairs pacemaker cell excitation, establishing an in vivo physiological role for KGDHC-derived ATP in heart rate regulation.\",\n      \"evidence\": \"Forward genetic screen, positional cloning, gene knockdown, ATP measurement, and electrical pacing in zebrafish\",\n      \"pmids\": [\"25697682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cardiac phenotype is specific to DLST or general KGDHC deficiency not distinguished\", \"Mammalian cardiac phenotype of DLST loss not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placing DLST as a metabolic vulnerability in cancer: knockdown in MYC-driven T-ALL cells accumulated α-KG and depleted succinyl-CoA, and succinate rescue confirmed the TCA cycle bottleneck, demonstrating DLST is a required metabolic node for certain oncogene-driven tumors.\",\n      \"evidence\": \"RNAi knockdown, polar metabolomics, succinate rescue, and zebrafish genetic model in human T-ALL cells\",\n      \"pmids\": [\"26876595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DLST dependency generalizes beyond MYC-driven contexts not clear\", \"Therapeutic targeting strategy not developed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Establishing DLST as a pheochromocytoma/paraganglioma susceptibility gene: the germline p.Gly374Glu variant abolished DLST enzymatic function and caused accumulation of the oncometabolite 2-hydroxyglutarate with pseudohypoxic DNA methylation profiles, mechanistically linking DLST loss-of-function to tumorigenesis.\",\n      \"evidence\": \"¹³C₅-glutamate isotope tracing, cell-based enzyme assay, TCA metabolite profiling, DNA methylation analysis, and LOH analysis in patient tumors\",\n      \"pmids\": [\"30929736\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Penetrance and genotype-phenotype correlations for different DLST variants not established\", \"Source of 2-HG production (enzymatic versus non-enzymatic) not fully resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Dissecting the downstream consequence of DLST loss in tumors: DLST depletion in MYCN-amplified neuroblastoma primarily impaired NADH production and OXPHOS rather than anaplerosis, while in TNBC cells DLST loss elevated ROS as a key mediator of growth inhibition, clarifying tissue-specific metabolic consequences.\",\n      \"evidence\": \"shRNA depletion, metabolomics, NADH/OXPHOS measurements, ROS assays, NAC rescue, and in vivo xenograft models across neuroblastoma and TNBC cell lines\",\n      \"pmids\": [\"34233924\", \"34785772\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NADH versus ROS mechanisms are context-dependent or coexistent not resolved\", \"Specific ROS species and downstream signaling pathways not fully characterized\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extending the disease genetics: additional DLST variants (p.Pro384Leu, compound heterozygous p.Gly374Glu/p.Thr383Ala) were shown to impair enzymatic activity and produce DNA hypermethylation, confirming that multiple loss-of-function alleles converge on the same pathogenic mechanism in pheochromocytoma/paraganglioma.\",\n      \"evidence\": \"Functional enzyme activity assays and DNA methylation profiling of patient-derived tumor samples\",\n      \"pmids\": [\"33180916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for why these specific residues are critical not determined\", \"Animal models recapitulating DLST-driven PPGL not available\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identifying regulators of DLST protein stability and mitochondrial import: Grpel2 physically interacts with DLST and promotes its mitochondrial import under high-glucose conditions, while lncRNA MEG3 binds DLST protein and prevents its degradation, revealing post-translational control layers for DLST abundance.\",\n      \"evidence\": \"Co-IP, mitochondrial import assays, RNA pulldown, RIP-qPCR, knockdown/overexpression rescue in cardiomyocytes and porcine satellite cells\",\n      \"pmids\": [\"36927450\", \"37506369\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin ligase(s) targeting DLST not identified\", \"Whether Grpel2-DLST interaction is direct or complex-mediated not resolved\", \"Grpel2 interaction validated by co-IP only without reciprocal pull-down\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connecting DLST transcriptional control to chromatin regulation: EPC1/2 promote DLST expression via histone H3 acetylation in cooperation with SRF and FOXR2, linking epigenetic regulators to mitochondrial metabolism in hematopoietic stem and progenitor cell proliferation.\",\n      \"evidence\": \"Zebrafish EPC1/2 depletion, ChIP-based H3 acetylation analysis, gene expression profiling in K562 cells\",\n      \"pmids\": [\"38439957\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether EPC1/2 directly binds the DLST promoter not confirmed\", \"DLST's specific role in HSPC biology is inferred rather than directly tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Expanding DLST's post-translational regulation: lncRNA APCDD1L-AS1, transcriptionally activated by HIF-1α under hypoxia, binds DLST protein and prevents its ubiquitination and proteasomal degradation, thereby sustaining TCA cycle flux to drive osimertinib resistance in lung adenocarcinoma.\",\n      \"evidence\": \"Co-IP/complex formation, ubiquitination assay, knockdown/overexpression, luciferase reporter, in vivo drug resistance models\",\n      \"pmids\": [\"40634956\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the E3 ubiquitin ligase for DLST still unknown\", \"Whether APCDD1L-AS1 blocks a specific ubiquitin site on DLST not determined\", \"Single study without independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the identity of the E3 ubiquitin ligase(s) targeting DLST for degradation, the molecular mechanism by which MIRTD promotes respiratory chain complex assembly, and whether nuclear translocation of DLST under nutrient stress represents a physiologically important epigenetic regulatory mechanism.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"E3 ligase for DLST not identified\", \"MIRTD mechanism of action in complex I/IV assembly unknown\", \"Nuclear DLST and histone succinylation link requires peer-reviewed confirmation\", \"Structural basis of DLST catalysis and disease variants not resolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 3, 4, 9]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 4, 5, 6, 7, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [5, 8]}\n    ],\n    \"complexes\": [\n      \"α-ketoglutarate dehydrogenase complex (KGDHC)\"\n    ],\n    \"partners\": [\n      \"OGDH\",\n      \"DLD\",\n      \"Grpel2\",\n      \"MEG3\",\n      \"APCDD1L-AS1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}