{"gene":"THADA","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2017,"finding":"THADA binds the sarco/ER Ca2+ ATPase (SERCA) and acts as an uncoupler, dissociating ATP hydrolysis from Ca2+ transport into the ER. Knockout of THADA in Drosophila causes obesity, hyperphagia, reduced energy production, and cold sensitivity; reducing SERCA activity in THADA mutant flies rescues their obesity, establishing SERCA as the key effector of THADA function.","method":"Drosophila knockout, protein binding assay, genetic epistasis (SERCA activity reduction in THADA mutant background)","journal":"Developmental Cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with defined rescue phenotype, binding interaction demonstrated, replicated across multiple phenotypic readouts in same study","pmids":["28399403"],"is_preprint":false},{"year":2023,"finding":"THADA reduces ER Ca2+ stores in pancreatic β-cells by inhibiting Ca2+ re-uptake via SERCA2 and inducing Ca2+ leakage through RyR2. Upon persistent ER stress, THADA interacts with and activates a pro-apoptotic complex comprising DR5, FADD, and caspase-8, aggravating ER stress-induced apoptosis. Global and β-cell-specific Thada-knockout mice show improved glycemic control, enhanced β-cell function, and decreased β-cell apoptosis.","method":"Global and β-cell-specific Thada knockout mice, Ca2+ imaging, co-immunoprecipitation of DR5/FADD/caspase-8 complex, SERCA2 and RyR2 functional assays, mouse metabolic phenotyping","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including KO mouse models, direct Ca2+ measurements, protein complex co-IP, and in vivo metabolic phenotyping in a single study","pmids":["36823211"],"is_preprint":false},{"year":2025,"finding":"THADA forms a complex with FTSJ1 (the human ortholog of yeast Trm7) to mediate 2'-O-methylation at position 32 (Nm32) of the tRNA anticodon loop. Cryo-EM structure reveals FTSJ1 binds THADA via its C-terminal region with a unique interaction mode distinct from the FTSJ1-WDR6 complex; tRNA substrate is anchored inside THADA, and key THADA residues for tRNA interaction were identified by structural and biochemical analyses.","method":"Cryo-electron microscopy structure determination, biochemical binding and methylation assays, mutagenesis of THADA-tRNA contact residues","journal":"Communications Biology","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM structure combined with biochemical validation and mutagenesis in single study","pmids":["40483304"],"is_preprint":false},{"year":2022,"finding":"THADA (human homolog of yeast Trm732) is required for 2'-O-methylation of tRNA residue 32 by FTSJ1 (Trm7). A conserved RRSAGLP motif in the DUF2428 domain of THADA is essential for tRNA modification activity, as variants in this motif abolish methylation.","method":"Yeast complementation assay with Trm732 variants, in vivo tRNA modification activity assay, mutagenesis of conserved RRSAGLP motif","journal":"ACS Omega","confidence":"High","confidence_rationale":"Tier 1 — functional mutagenesis in yeast with direct tRNA modification readout; human THADA homolog activity validated","pmids":["35559166"],"is_preprint":false},{"year":2021,"finding":"THADA is critically required for Golgi residency of PD-L1 in cancer cells. THADA mediates the interaction between PD-L1 (as cargo) and SEC24A, a COPII trafficking vesicle module. Silencing THADA causes ER retention and ERAD-dependent clearance of PD-L1, without affecting MHC-I. This reduces PD-L1 surface expression and enhances T cell-mediated cytotoxicity.","method":"THADA knockdown in human CRC cells, co-immunoprecipitation of PD-L1/SEC24A, ER retention assay, ERAD inhibition, T cell killing assay, MC38 mouse tumor models","journal":"Journal for Immunotherapy of Cancer","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including co-IP, functional knockdown with defined molecular and cellular readouts, and in vivo validation","pmids":["34341130"],"is_preprint":false},{"year":2017,"finding":"THADA gene fusion with LOC389473 (and other regions near IGF2BP3) does not produce a chimeric protein but instead drives strong overexpression of full-length IGF2BP3, leading to increased IGF2 translation and IGF1R signaling via PI3K and MAPK cascades, promoting cell proliferation, invasion, and transformation.","method":"Whole-transcriptome and whole-genome analysis, western blot for IGF2BP3 protein, IGF1R pathway activation assays, in vitro proliferation/invasion, in vivo xenograft tumor models with IGF1R inhibitor treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — mechanistic dissection via multiple methods including genomic, proteomic, functional cell assays, and in vivo validation","pmids":["28193878"],"is_preprint":false},{"year":2009,"finding":"The THADA gene variant (rs7578597) is associated with lower β-cell response to GLP-1 and arginine stimulation in hyperglycemic clamp studies, suggesting lower β-cell mass as a possible pathogenic mechanism.","method":"Hyperglycemic clamp with GLP-1 and arginine stimuli in human cohort (n=336), genotyping of THADA rs7578597","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 3 — human physiological study linking genotype to specific β-cell functional readout, but no direct molecular mechanism demonstrated","pmids":["19833888"],"is_preprint":false},{"year":2007,"finding":"THADA protein contains ARM repeat-like structures suggesting involvement in protein-protein interactions. The most conserved domain (aa 1033-1415 in Homo sapiens, 70.5% identity across vertebrates) is disrupted by chromosomal rearrangements found in thyroid adenomas, indicating loss of function of this domain contributes to follicular neoplasia.","method":"Comparative genomic sequencing across vertebrate species, multiple sequence alignment, domain structure analysis, mapping of thyroid adenoma translocation breakpoints","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 3 — domain identification by sequence analysis confirmed against tumor translocation data, but no direct biochemical functional validation","pmids":["17889454"],"is_preprint":false},{"year":2024,"finding":"THADA knockdown inhibits cancer cell proliferation and markedly decreases expression of L-type amino acid transporter LAT1. Cardiac glycosides (ouabain, oleandrin, digoxin) decrease THADA expression via Na+/K+-ATPase inhibition and reduce LAT1 expression, and THADA re-expression in THADA-knockdown cells rescues proliferation, placing THADA upstream of LAT1 in a proliferative signaling pathway.","method":"THADA knockdown and rescue by re-expression in HepG2 and KB cells, western blot for LAT1, treatment with cardiac glycosides, LAT1 inhibitor JPH203 proliferation assay","journal":"The Journal of Physiological Sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — knockdown/rescue experiment with defined molecular readout (LAT1), but pathway mechanism linking THADA to LAT1 not fully elucidated","pmids":["38561668"],"is_preprint":false},{"year":2024,"finding":"THADA inhibits autophagy and increases sensitivity to 5-FU in gastric cancer cells through activation of the PI3K/AKT/mTOR and mTORC1 signaling pathways. Elevated THADA expression correlates with downregulation of autophagy proteins LC3, ATG13, ULK1, and TFEB, and is associated with mTOR and related proteins (mLST8, RHEB, TSC2).","method":"NGS of chemotherapy-sensitive vs non-sensitive GC tissues, in vitro experiments in GC cells with THADA manipulation, western blot for autophagy and mTOR pathway proteins","journal":"Iranian Journal of Basic Medical Sciences","confidence":"Low","confidence_rationale":"Tier 3 — correlative data linking THADA to mTOR pathway components without direct mechanistic reconstitution or clean epistasis","pmids":["38234670"],"is_preprint":false}],"current_model":"THADA is a multifunctional protein that: (1) forms a complex with FTSJ1 to mediate 2'-O-methylation of tRNA at position 32 (Nm32), as revealed by cryo-EM structure and biochemical mutagenesis; (2) binds and uncouples SERCA Ca2+ ATPase to promote Ca2+ release from the ER, thereby regulating the balance between energy storage and thermogenesis; (3) in pancreatic β-cells, inhibits SERCA2-mediated Ca2+ re-uptake and promotes Ca2+ leakage via RyR2 while also assembling a pro-apoptotic DR5/FADD/caspase-8 complex under ER stress; and (4) in cancer cells, facilitates COPII-dependent (SEC24A-mediated) trafficking of PD-L1 from ER to Golgi, maintaining PD-L1 surface expression, and drives IGF2BP3 overexpression via gene fusion to activate IGF1R/PI3K/MAPK signaling."},"narrative":{"teleology":[{"year":2007,"claim":"Initial characterization revealed that THADA contains ARM repeat-like domains and that its most conserved C-terminal region is disrupted by thyroid adenoma translocations, implicating loss of this domain in neoplasia and suggesting a protein-interaction scaffolding function.","evidence":"Comparative vertebrate genomic sequencing and mapping of translocation breakpoints in thyroid adenomas","pmids":["17889454"],"confidence":"Medium","gaps":["No biochemical validation of ARM repeat-mediated interactions","Mechanism linking domain disruption to thyroid neoplasia not established"]},{"year":2009,"claim":"A common THADA variant (rs7578597) was linked to reduced β-cell secretory response in humans, providing the first physiological evidence connecting THADA to pancreatic β-cell function.","evidence":"Hyperglycemic clamp with GLP-1 and arginine stimulation in a genotyped human cohort (n=336)","pmids":["19833888"],"confidence":"Medium","gaps":["No direct molecular mechanism demonstrated for the variant's effect on β-cell function","Whether the variant alters THADA expression or protein function was unknown"]},{"year":2017,"claim":"Two breakthroughs established distinct THADA functions: binding and uncoupling SERCA to control ER Ca²⁺ and energy balance (with Drosophila THADA KO causing obesity rescued by SERCA reduction), and participation in gene fusions that drive IGF2BP3 overexpression and IGF1R/PI3K/MAPK oncogenic signaling in thyroid tumors.","evidence":"Drosophila knockout with genetic epistasis for SERCA function; whole-genome/transcriptome analysis with xenograft validation for gene fusion","pmids":["28399403","28193878"],"confidence":"High","gaps":["Structural basis of THADA-SERCA interaction not determined","Whether the SERCA-uncoupling and gene-fusion mechanisms are relevant in the same tissue contexts was unclear","THADA gene fusions drive IGF2BP3 overexpression without producing a chimeric THADA protein, so the normal THADA protein is not directly implicated in this oncogenic pathway"]},{"year":2021,"claim":"THADA was identified as a cargo adaptor required for ER-to-Golgi trafficking of PD-L1, bridging PD-L1 to the COPII component SEC24A; this explained how THADA loss causes ER retention and degradation of PD-L1, enhancing anti-tumor immunity.","evidence":"THADA knockdown in human colorectal cancer cells, co-immunoprecipitation of PD-L1/SEC24A, ER retention and ERAD assays, T cell killing assay, MC38 mouse tumor model","pmids":["34341130"],"confidence":"High","gaps":["Whether THADA mediates trafficking of other ER-to-Golgi cargoes beyond PD-L1 was not tested","Structural basis of the THADA-SEC24A-PD-L1 ternary interaction was not resolved"]},{"year":2022,"claim":"THADA (human ortholog of yeast Trm732) was shown to be required for FTSJ1-mediated 2'-O-methylation at tRNA position 32, with a conserved RRSAGLP motif in its DUF2428 domain essential for this catalytic function.","evidence":"Yeast complementation with Trm732/THADA variants, in vivo tRNA modification assays, mutagenesis of conserved motif","pmids":["35559166"],"confidence":"High","gaps":["Structural basis of THADA-FTSJ1-tRNA interaction not yet visualized","Physiological consequences of loss of Nm32 modification in mammalian cells not assessed"]},{"year":2023,"claim":"In mammalian β-cells, THADA was shown to deplete ER Ca²⁺ via dual mechanisms — SERCA2 inhibition and RyR2-mediated leakage — and to assemble a DR5/FADD/caspase-8 pro-apoptotic complex under ER stress, with β-cell-specific Thada knockout improving glycemic control in mice.","evidence":"Global and β-cell-specific Thada knockout mice, Ca²⁺ imaging, co-immunoprecipitation of DR5/FADD/caspase-8, in vivo metabolic phenotyping","pmids":["36823211"],"confidence":"High","gaps":["How THADA is regulated or activated to switch between its Ca²⁺-uncoupling and apoptotic-complex-assembly roles is unknown","Whether the DR5/FADD/caspase-8 complex forms in non-β-cell contexts was not tested"]},{"year":2024,"claim":"THADA was placed upstream of LAT1 (amino acid transporter) expression in cancer cell proliferation and linked to PI3K/AKT/mTOR-mediated autophagy inhibition, broadening its roles in cancer cell signaling.","evidence":"THADA knockdown/rescue in HepG2 and KB cells with LAT1 readout; NGS and western blot in gastric cancer cells with mTOR pathway analysis","pmids":["38561668","38234670"],"confidence":"Medium","gaps":["Direct mechanism linking THADA to LAT1 transcription or stability not elucidated","mTOR pathway activation data are correlative without epistasis or reconstitution","Whether these cancer proliferation roles reflect the known SERCA or tRNA modification functions is unclear"]},{"year":2025,"claim":"Cryo-EM structure of the THADA-FTSJ1-tRNA ternary complex revealed that tRNA is anchored inside THADA and that FTSJ1 engages THADA via a unique C-terminal interaction mode distinct from the FTSJ1-WDR6 complex, completing the structural picture of THADA's role in tRNA modification.","evidence":"Cryo-EM structure determination, biochemical binding and methylation assays, mutagenesis of THADA-tRNA contact residues","pmids":["40483304"],"confidence":"High","gaps":["How THADA's tRNA modification function relates to its SERCA and trafficking functions — whether these are context-dependent or simultaneous — is unresolved","Physiological consequences of disrupting THADA-tRNA contacts in mammalian models not yet tested"]},{"year":null,"claim":"It remains unknown how THADA coordinates its multiple functions (tRNA modification, SERCA uncoupling, COPII trafficking, apoptotic complex assembly), whether these are regulated by distinct domains or cellular states, and whether a unifying structural or regulatory principle governs its multifunctionality.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of THADA in complex with SERCA or the DR5/FADD/caspase-8 complex","Tissue-specific regulation of THADA's distinct functions is not characterized","Whether ARM-repeat domains mediate all protein-protein interactions or only a subset is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[2,3]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,4]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[4]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[2,3]}],"complexes":["THADA-FTSJ1 tRNA modification complex"],"partners":["FTSJ1","ATP2A2","SEC24A","CD274","TNFRSF10B","FADD","RYR2"],"other_free_text":[]},"mechanistic_narrative":"THADA is a multifunctional scaffolding protein that participates in tRNA modification, ER calcium homeostasis, and intracellular protein trafficking. THADA forms a complex with the methyltransferase FTSJ1 to mediate 2'-O-methylation at position 32 of tRNA anticodon loops, with a conserved DUF2428-domain motif essential for this activity and the tRNA substrate anchored within THADA itself [PMID:35559166, PMID:40483304]. THADA binds and uncouples the sarco/ER Ca²⁺ ATPase SERCA, dissociating ATP hydrolysis from Ca²⁺ transport; in pancreatic β-cells this depletes ER Ca²⁺ stores through combined SERCA2 inhibition and RyR2-mediated leakage, and under persistent ER stress THADA assembles a DR5/FADD/caspase-8 pro-apoptotic complex that drives β-cell apoptosis [PMID:28399403, PMID:36823211]. THADA also functions as a cargo adaptor in COPII-dependent ER-to-Golgi trafficking by bridging PD-L1 to the SEC24A coat subunit; loss of THADA causes ER retention and ERAD-mediated degradation of PD-L1, reducing its surface expression and enhancing T cell cytotoxicity against cancer cells [PMID:34341130]."},"prefetch_data":{"uniprot":{"accession":"Q6YHU6","full_name":"tRNA (32-2'-O)-methyltransferase regulator THADA","aliases":["Gene inducing thyroid adenomas protein","Thyroid adenoma-associated protein"],"length_aa":1953,"mass_kda":219.6,"function":"Together with methyltransferase FTSJ1, methylates the 2'-O-ribose of nucleotides at position 32 of the anticodon loop of substrate tRNAs","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q6YHU6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/THADA","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/THADA","total_profiled":1310},"omim":[{"mim_id":"611800","title":"THADA ARMADILLO REPEAT-CONTAINING PROTEIN; THADA","url":"https://www.omim.org/entry/611800"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/THADA"},"hgnc":{"alias_symbol":["FLJ21877","KIAA1767","GITA","ARMC13","Trm732"],"prev_symbol":[]},"alphafold":{"accession":"Q6YHU6","domains":[{"cath_id":"1.20.1440","chopping":"320-429","consensus_level":"medium","plddt":84.1179,"start":320,"end":429},{"cath_id":"-","chopping":"1147-1268","consensus_level":"medium","plddt":85.0271,"start":1147,"end":1268},{"cath_id":"1.25.10,1.25.10","chopping":"1630-1793","consensus_level":"high","plddt":85.3365,"start":1630,"end":1793},{"cath_id":"-","chopping":"1813-1826_1842-1923","consensus_level":"high","plddt":75.828,"start":1813,"end":1923}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6YHU6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6YHU6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6YHU6-F1-predicted_aligned_error_v6.png","plddt_mean":79.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=THADA","jax_strain_url":"https://www.jax.org/strain/search?query=THADA"},"sequence":{"accession":"Q6YHU6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6YHU6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6YHU6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6YHU6"}},"corpus_meta":[{"pmid":"22180642","id":"PMC_22180642","title":"Replication of association of DENND1A and THADA variants with polycystic ovary syndrome in European cohorts.","date":"2011","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22180642","citation_count":140,"is_preprint":false},{"pmid":"18567820","id":"PMC_18567820","title":"Association testing of novel type 2 diabetes risk alleles in the JAZF1, CDC123/CAMK1D, TSPAN8, THADA, ADAMTS9, and NOTCH2 loci with insulin release, insulin sensitivity, and obesity in a population-based sample of 4,516 glucose-tolerant middle-aged Danes.","date":"2008","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/18567820","citation_count":120,"is_preprint":false},{"pmid":"19833888","id":"PMC_19833888","title":"Gene variants in the novel type 2 diabetes loci CDC123/CAMK1D, THADA, ADAMTS9, BCL11A, and MTNR1B affect different aspects of pancreatic beta-cell 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and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians","url":"https://pubmed.ncbi.nlm.nih.gov/29727258","citation_count":6,"is_preprint":false},{"pmid":"28399393","id":"PMC_28399393","title":"Thermogenesis by THADA.","date":"2017","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/28399393","citation_count":5,"is_preprint":false},{"pmid":"38877784","id":"PMC_38877784","title":"THADA-IGF2BP3 gene fusions in thyroid fine needle aspiration is involved in the pathway to \"noninvasive follicular thyroid neoplasm with papillary-like nuclear features\".","date":"2024","source":"Diagnostic cytopathology","url":"https://pubmed.ncbi.nlm.nih.gov/38877784","citation_count":5,"is_preprint":false},{"pmid":"38234670","id":"PMC_38234670","title":"THADA inhibits autophagy and increases 5-FU sensitivity in gastric cancer cells via the PI3K/AKT/mTOR signaling pathway.","date":"2024","source":"Iranian journal of basic medical 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Diabetes.","date":"2022","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/36672824","citation_count":2,"is_preprint":false},{"pmid":"32364097","id":"PMC_32364097","title":"Morphological and molecular data of two species of the rare genera Thada Thorne, 1941 and Tenunemellus Siddiqi, 1986 (Nematoda: Tylenchidae) from Iran.","date":"2020","source":"Journal of helminthology","url":"https://pubmed.ncbi.nlm.nih.gov/32364097","citation_count":2,"is_preprint":false},{"pmid":"40483304","id":"PMC_40483304","title":"Structural insights into tRNA recognition of the human FTSJ1-THADA complex.","date":"2025","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/40483304","citation_count":1,"is_preprint":false},{"pmid":"18522714","id":"PMC_18522714","title":"Chromosomal assignment of canine THADA gene to CFA 10q25.","date":"2008","source":"Molecular 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prostate cancer","date":"2025-05-21","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.16.654590","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":18929,"output_tokens":2822,"usd":0.049558},"stage2":{"model":"claude-opus-4-6","input_tokens":6164,"output_tokens":2771,"usd":0.150143},"total_usd":0.199701,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"THADA binds the sarco/ER Ca2+ ATPase (SERCA) and acts as an uncoupler, dissociating ATP hydrolysis from Ca2+ transport into the ER. Knockout of THADA in Drosophila causes obesity, hyperphagia, reduced energy production, and cold sensitivity; reducing SERCA activity in THADA mutant flies rescues their obesity, establishing SERCA as the key effector of THADA function.\",\n      \"method\": \"Drosophila knockout, protein binding assay, genetic epistasis (SERCA activity reduction in THADA mutant background)\",\n      \"journal\": \"Developmental Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with defined rescue phenotype, binding interaction demonstrated, replicated across multiple phenotypic readouts in same study\",\n      \"pmids\": [\"28399403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"THADA reduces ER Ca2+ stores in pancreatic β-cells by inhibiting Ca2+ re-uptake via SERCA2 and inducing Ca2+ leakage through RyR2. Upon persistent ER stress, THADA interacts with and activates a pro-apoptotic complex comprising DR5, FADD, and caspase-8, aggravating ER stress-induced apoptosis. Global and β-cell-specific Thada-knockout mice show improved glycemic control, enhanced β-cell function, and decreased β-cell apoptosis.\",\n      \"method\": \"Global and β-cell-specific Thada knockout mice, Ca2+ imaging, co-immunoprecipitation of DR5/FADD/caspase-8 complex, SERCA2 and RyR2 functional assays, mouse metabolic phenotyping\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including KO mouse models, direct Ca2+ measurements, protein complex co-IP, and in vivo metabolic phenotyping in a single study\",\n      \"pmids\": [\"36823211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"THADA forms a complex with FTSJ1 (the human ortholog of yeast Trm7) to mediate 2'-O-methylation at position 32 (Nm32) of the tRNA anticodon loop. Cryo-EM structure reveals FTSJ1 binds THADA via its C-terminal region with a unique interaction mode distinct from the FTSJ1-WDR6 complex; tRNA substrate is anchored inside THADA, and key THADA residues for tRNA interaction were identified by structural and biochemical analyses.\",\n      \"method\": \"Cryo-electron microscopy structure determination, biochemical binding and methylation assays, mutagenesis of THADA-tRNA contact residues\",\n      \"journal\": \"Communications Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure combined with biochemical validation and mutagenesis in single study\",\n      \"pmids\": [\"40483304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"THADA (human homolog of yeast Trm732) is required for 2'-O-methylation of tRNA residue 32 by FTSJ1 (Trm7). A conserved RRSAGLP motif in the DUF2428 domain of THADA is essential for tRNA modification activity, as variants in this motif abolish methylation.\",\n      \"method\": \"Yeast complementation assay with Trm732 variants, in vivo tRNA modification activity assay, mutagenesis of conserved RRSAGLP motif\",\n      \"journal\": \"ACS Omega\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional mutagenesis in yeast with direct tRNA modification readout; human THADA homolog activity validated\",\n      \"pmids\": [\"35559166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"THADA is critically required for Golgi residency of PD-L1 in cancer cells. THADA mediates the interaction between PD-L1 (as cargo) and SEC24A, a COPII trafficking vesicle module. Silencing THADA causes ER retention and ERAD-dependent clearance of PD-L1, without affecting MHC-I. This reduces PD-L1 surface expression and enhances T cell-mediated cytotoxicity.\",\n      \"method\": \"THADA knockdown in human CRC cells, co-immunoprecipitation of PD-L1/SEC24A, ER retention assay, ERAD inhibition, T cell killing assay, MC38 mouse tumor models\",\n      \"journal\": \"Journal for Immunotherapy of Cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including co-IP, functional knockdown with defined molecular and cellular readouts, and in vivo validation\",\n      \"pmids\": [\"34341130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"THADA gene fusion with LOC389473 (and other regions near IGF2BP3) does not produce a chimeric protein but instead drives strong overexpression of full-length IGF2BP3, leading to increased IGF2 translation and IGF1R signaling via PI3K and MAPK cascades, promoting cell proliferation, invasion, and transformation.\",\n      \"method\": \"Whole-transcriptome and whole-genome analysis, western blot for IGF2BP3 protein, IGF1R pathway activation assays, in vitro proliferation/invasion, in vivo xenograft tumor models with IGF1R inhibitor treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection via multiple methods including genomic, proteomic, functional cell assays, and in vivo validation\",\n      \"pmids\": [\"28193878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The THADA gene variant (rs7578597) is associated with lower β-cell response to GLP-1 and arginine stimulation in hyperglycemic clamp studies, suggesting lower β-cell mass as a possible pathogenic mechanism.\",\n      \"method\": \"Hyperglycemic clamp with GLP-1 and arginine stimuli in human cohort (n=336), genotyping of THADA rs7578597\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — human physiological study linking genotype to specific β-cell functional readout, but no direct molecular mechanism demonstrated\",\n      \"pmids\": [\"19833888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"THADA protein contains ARM repeat-like structures suggesting involvement in protein-protein interactions. The most conserved domain (aa 1033-1415 in Homo sapiens, 70.5% identity across vertebrates) is disrupted by chromosomal rearrangements found in thyroid adenomas, indicating loss of function of this domain contributes to follicular neoplasia.\",\n      \"method\": \"Comparative genomic sequencing across vertebrate species, multiple sequence alignment, domain structure analysis, mapping of thyroid adenoma translocation breakpoints\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — domain identification by sequence analysis confirmed against tumor translocation data, but no direct biochemical functional validation\",\n      \"pmids\": [\"17889454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"THADA knockdown inhibits cancer cell proliferation and markedly decreases expression of L-type amino acid transporter LAT1. Cardiac glycosides (ouabain, oleandrin, digoxin) decrease THADA expression via Na+/K+-ATPase inhibition and reduce LAT1 expression, and THADA re-expression in THADA-knockdown cells rescues proliferation, placing THADA upstream of LAT1 in a proliferative signaling pathway.\",\n      \"method\": \"THADA knockdown and rescue by re-expression in HepG2 and KB cells, western blot for LAT1, treatment with cardiac glycosides, LAT1 inhibitor JPH203 proliferation assay\",\n      \"journal\": \"The Journal of Physiological Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — knockdown/rescue experiment with defined molecular readout (LAT1), but pathway mechanism linking THADA to LAT1 not fully elucidated\",\n      \"pmids\": [\"38561668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"THADA inhibits autophagy and increases sensitivity to 5-FU in gastric cancer cells through activation of the PI3K/AKT/mTOR and mTORC1 signaling pathways. Elevated THADA expression correlates with downregulation of autophagy proteins LC3, ATG13, ULK1, and TFEB, and is associated with mTOR and related proteins (mLST8, RHEB, TSC2).\",\n      \"method\": \"NGS of chemotherapy-sensitive vs non-sensitive GC tissues, in vitro experiments in GC cells with THADA manipulation, western blot for autophagy and mTOR pathway proteins\",\n      \"journal\": \"Iranian Journal of Basic Medical Sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — correlative data linking THADA to mTOR pathway components without direct mechanistic reconstitution or clean epistasis\",\n      \"pmids\": [\"38234670\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"THADA is a multifunctional protein that: (1) forms a complex with FTSJ1 to mediate 2'-O-methylation of tRNA at position 32 (Nm32), as revealed by cryo-EM structure and biochemical mutagenesis; (2) binds and uncouples SERCA Ca2+ ATPase to promote Ca2+ release from the ER, thereby regulating the balance between energy storage and thermogenesis; (3) in pancreatic β-cells, inhibits SERCA2-mediated Ca2+ re-uptake and promotes Ca2+ leakage via RyR2 while also assembling a pro-apoptotic DR5/FADD/caspase-8 complex under ER stress; and (4) in cancer cells, facilitates COPII-dependent (SEC24A-mediated) trafficking of PD-L1 from ER to Golgi, maintaining PD-L1 surface expression, and drives IGF2BP3 overexpression via gene fusion to activate IGF1R/PI3K/MAPK signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"THADA is a multifunctional scaffolding protein that participates in tRNA modification, ER calcium homeostasis, and intracellular protein trafficking. THADA forms a complex with the methyltransferase FTSJ1 to mediate 2'-O-methylation at position 32 of tRNA anticodon loops, with a conserved DUF2428-domain motif essential for this activity and the tRNA substrate anchored within THADA itself [PMID:35559166, PMID:40483304]. THADA binds and uncouples the sarco/ER Ca²⁺ ATPase SERCA, dissociating ATP hydrolysis from Ca²⁺ transport; in pancreatic β-cells this depletes ER Ca²⁺ stores through combined SERCA2 inhibition and RyR2-mediated leakage, and under persistent ER stress THADA assembles a DR5/FADD/caspase-8 pro-apoptotic complex that drives β-cell apoptosis [PMID:28399403, PMID:36823211]. THADA also functions as a cargo adaptor in COPII-dependent ER-to-Golgi trafficking by bridging PD-L1 to the SEC24A coat subunit; loss of THADA causes ER retention and ERAD-mediated degradation of PD-L1, reducing its surface expression and enhancing T cell cytotoxicity against cancer cells [PMID:34341130].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Initial characterization revealed that THADA contains ARM repeat-like domains and that its most conserved C-terminal region is disrupted by thyroid adenoma translocations, implicating loss of this domain in neoplasia and suggesting a protein-interaction scaffolding function.\",\n      \"evidence\": \"Comparative vertebrate genomic sequencing and mapping of translocation breakpoints in thyroid adenomas\",\n      \"pmids\": [\"17889454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No biochemical validation of ARM repeat-mediated interactions\",\n        \"Mechanism linking domain disruption to thyroid neoplasia not established\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"A common THADA variant (rs7578597) was linked to reduced β-cell secretory response in humans, providing the first physiological evidence connecting THADA to pancreatic β-cell function.\",\n      \"evidence\": \"Hyperglycemic clamp with GLP-1 and arginine stimulation in a genotyped human cohort (n=336)\",\n      \"pmids\": [\"19833888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct molecular mechanism demonstrated for the variant's effect on β-cell function\",\n        \"Whether the variant alters THADA expression or protein function was unknown\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Two breakthroughs established distinct THADA functions: binding and uncoupling SERCA to control ER Ca²⁺ and energy balance (with Drosophila THADA KO causing obesity rescued by SERCA reduction), and participation in gene fusions that drive IGF2BP3 overexpression and IGF1R/PI3K/MAPK oncogenic signaling in thyroid tumors.\",\n      \"evidence\": \"Drosophila knockout with genetic epistasis for SERCA function; whole-genome/transcriptome analysis with xenograft validation for gene fusion\",\n      \"pmids\": [\"28399403\", \"28193878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of THADA-SERCA interaction not determined\",\n        \"Whether the SERCA-uncoupling and gene-fusion mechanisms are relevant in the same tissue contexts was unclear\",\n        \"THADA gene fusions drive IGF2BP3 overexpression without producing a chimeric THADA protein, so the normal THADA protein is not directly implicated in this oncogenic pathway\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"THADA was identified as a cargo adaptor required for ER-to-Golgi trafficking of PD-L1, bridging PD-L1 to the COPII component SEC24A; this explained how THADA loss causes ER retention and degradation of PD-L1, enhancing anti-tumor immunity.\",\n      \"evidence\": \"THADA knockdown in human colorectal cancer cells, co-immunoprecipitation of PD-L1/SEC24A, ER retention and ERAD assays, T cell killing assay, MC38 mouse tumor model\",\n      \"pmids\": [\"34341130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether THADA mediates trafficking of other ER-to-Golgi cargoes beyond PD-L1 was not tested\",\n        \"Structural basis of the THADA-SEC24A-PD-L1 ternary interaction was not resolved\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"THADA (human ortholog of yeast Trm732) was shown to be required for FTSJ1-mediated 2'-O-methylation at tRNA position 32, with a conserved RRSAGLP motif in its DUF2428 domain essential for this catalytic function.\",\n      \"evidence\": \"Yeast complementation with Trm732/THADA variants, in vivo tRNA modification assays, mutagenesis of conserved motif\",\n      \"pmids\": [\"35559166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of THADA-FTSJ1-tRNA interaction not yet visualized\",\n        \"Physiological consequences of loss of Nm32 modification in mammalian cells not assessed\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"In mammalian β-cells, THADA was shown to deplete ER Ca²⁺ via dual mechanisms — SERCA2 inhibition and RyR2-mediated leakage — and to assemble a DR5/FADD/caspase-8 pro-apoptotic complex under ER stress, with β-cell-specific Thada knockout improving glycemic control in mice.\",\n      \"evidence\": \"Global and β-cell-specific Thada knockout mice, Ca²⁺ imaging, co-immunoprecipitation of DR5/FADD/caspase-8, in vivo metabolic phenotyping\",\n      \"pmids\": [\"36823211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How THADA is regulated or activated to switch between its Ca²⁺-uncoupling and apoptotic-complex-assembly roles is unknown\",\n        \"Whether the DR5/FADD/caspase-8 complex forms in non-β-cell contexts was not tested\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"THADA was placed upstream of LAT1 (amino acid transporter) expression in cancer cell proliferation and linked to PI3K/AKT/mTOR-mediated autophagy inhibition, broadening its roles in cancer cell signaling.\",\n      \"evidence\": \"THADA knockdown/rescue in HepG2 and KB cells with LAT1 readout; NGS and western blot in gastric cancer cells with mTOR pathway analysis\",\n      \"pmids\": [\"38561668\", \"38234670\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct mechanism linking THADA to LAT1 transcription or stability not elucidated\",\n        \"mTOR pathway activation data are correlative without epistasis or reconstitution\",\n        \"Whether these cancer proliferation roles reflect the known SERCA or tRNA modification functions is unclear\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Cryo-EM structure of the THADA-FTSJ1-tRNA ternary complex revealed that tRNA is anchored inside THADA and that FTSJ1 engages THADA via a unique C-terminal interaction mode distinct from the FTSJ1-WDR6 complex, completing the structural picture of THADA's role in tRNA modification.\",\n      \"evidence\": \"Cryo-EM structure determination, biochemical binding and methylation assays, mutagenesis of THADA-tRNA contact residues\",\n      \"pmids\": [\"40483304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How THADA's tRNA modification function relates to its SERCA and trafficking functions — whether these are context-dependent or simultaneous — is unresolved\",\n        \"Physiological consequences of disrupting THADA-tRNA contacts in mammalian models not yet tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how THADA coordinates its multiple functions (tRNA modification, SERCA uncoupling, COPII trafficking, apoptotic complex assembly), whether these are regulated by distinct domains or cellular states, and whether a unifying structural or regulatory principle governs its multifunctionality.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of THADA in complex with SERCA or the DR5/FADD/caspase-8 complex\",\n        \"Tissue-specific regulation of THADA's distinct functions is not characterized\",\n        \"Whether ARM-repeat domains mediate all protein-protein interactions or only a subset is untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"complexes\": [\n      \"THADA-FTSJ1 tRNA modification complex\"\n    ],\n    \"partners\": [\n      \"FTSJ1\",\n      \"ATP2A2\",\n      \"SEC24A\",\n      \"CD274\",\n      \"TNFRSF10B\",\n      \"FADD\",\n      \"RYR2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}