{"gene":"TMEM74","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2008,"finding":"TMEM74 localizes to lysosomes and autophagosomes; overexpression in HeLa cells induces autophagic vacuolization, increases GFP-LC3 dot formation, and elevates endogenous LC3-II levels; these effects are partially attenuated by the autophagy inhibitor wortmannin; siRNA knockdown of TMEM74 abolishes starvation-induced autophagy.","method":"Northern blot, subcellular localization (fluorescence microscopy), GFP-LC3 assay, MDC staining, immunoblotting for LC3-II, wortmannin inhibition, siRNA knockdown","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (localization, overexpression, siRNA KD, LC3-II western blot) in a single lab","pmids":["18294959"],"is_preprint":false},{"year":2009,"finding":"TMEM74 overexpression induces high levels of autophagosome formation (GFP-LC3 dots) in a high-throughput functional screen; confirmed as an autophagy-inducing gene.","method":"High-throughput cell-based functional screen with automated fluorescence microscopy (GFP-LC3), cotransfection of cDNA library","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional screen with GFP-LC3 readout, replicated finding from PMID:18294959, single method for TMEM74 specifically","pmids":["19029833"],"is_preprint":false},{"year":2017,"finding":"TMEM74 increases autophagic flux and interacts with ATG16L1 (involved in autophagosome nucleation) and ATG9A (involved in membrane elongation); this autophagy induction is independent of the BECN1/PI3KC3 complex and ULK1; TMEM74 itself is downregulated through the autophagic process, suggesting a self-regulatory loop; TMEM74-induced autophagy promotes tumor cell survival under metabolic stress.","method":"Co-immunoprecipitation (interaction with ATG16L1 and ATG9A), autophagic flux assays, autophagy inhibitor studies, knockdown experiments, multiple tumor cell lines","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP for two binding partners, multiple orthogonal methods (flux assay, KD, OE, pharmacological inhibitors), multiple cell lines, single lab","pmids":["29048433"],"is_preprint":false},{"year":2017,"finding":"TMEM74 co-localizes with the pro-apoptotic protein BIK in subcellular organelles and physically interacts with BIK via the TM domains of TMEM74 and the BH3 domain of BIK; TMEM74 inhibits BIK-induced apoptosis through this interaction; TM domain-deficient TMEM74 mutant loses this inhibitory function; autophagosome formation inhibitor does not fully block the inhibition, indicating the effect is partly independent of autophagy.","method":"Co-immunoprecipitation, fluorescence co-localization, immunoblotting, domain-deletion mutants (TM-deficient TMEM74), autophagosome formation inhibitor, knockdown","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, co-localization, domain mutagenesis, multiple orthogonal methods in single lab","pmids":["28412412"],"is_preprint":false},{"year":2019,"finding":"TMEM74 functionally couples with HCN1 channels in basolateral amygdala (BLA) pyramidal neurons: genetic deletion or knockdown of Tmem74 reduces surface expression of HCN1, lowers hyperpolarization-activated cation current (Ih), and increases neuronal excitability; transmembrane domain 1 (TM1) of TMEM74 is essential for its membrane localization and enhancement of Ih; Tmem74 overexpression restores HCN1 trafficking and neuronal excitability; Tmem74-/- mice show anxiety-like behaviors reversed by Tmem74 re-expression.","method":"Genetic knockout (Tmem74-/-), selective BLA knockdown, whole-cell electrophysiology (Ih recordings), surface expression assay for HCN1, domain mutant analysis (TM1), viral re-expression, behavioral assays","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KO, KD, electrophysiology, surface expression, domain mutants, rescue), functional behavioral validation","pmids":["30886335"],"is_preprint":false},{"year":2023,"finding":"Tmem74-/- mice exhibit autism- and anxiety-like behaviors with increased excitability of pyramidal neurons (PNs) in the prelimbic cortex (PL); conditional deletion of Tmem74 in PL PNs revealed that PL→dorsal striatum fast-spiking interneuron projections mediate autism-like behaviors and hyperexcitability of FSIs, while PL→BLA PN projections mediate anxiety-like behaviors; optogenetic manipulation of PL-dSTR or PL-BLA circuits recapitulates these behavioral phenotypes; Tmem74 re-expression and chemogenetic inhibition of PL PNs reverse these behaviors.","method":"Conditional/global knockout, chemogenetic inhibition (DREADD), optogenetics, electrophysiology (excitability recordings), viral re-expression, behavioral assays","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (cKO, optogenetics, chemogenetics, electrophysiology, circuit-level dissection, rescue), rigorous circuit-level mechanistic dissection","pmids":["36690791"],"is_preprint":false},{"year":2026,"finding":"In goat ovarian granulosa cells, TMEM74 knockdown is associated with altered autophagy-related markers, reduced cell viability, and increased apoptosis; TMEM74 was identified as a candidate downstream effector in a pathway linking SIRT7-mediated H3K79 desuccinylation to autophagy regulation.","method":"siRNA knockdown of TMEM74, autophagy marker immunoblotting, cell viability assay, apoptosis assay, transcriptomic analysis","journal":"Theriogenology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single-method knockdown with limited mechanistic follow-up; TMEM74 is a candidate identified downstream of another protein, not the primary focus","pmids":["42061017"],"is_preprint":false}],"current_model":"TMEM74 is a lysosome/autophagosome transmembrane protein that promotes autophagy by physically interacting with ATG16L1 and ATG9A through a BECN1/PI3KC3- and ULK1-independent mechanism; it inhibits BIK-induced apoptosis via a direct TM domain–BH3 domain interaction; in neurons, TMEM74 couples with HCN1 channels—requiring its TM1 domain for membrane localization—to sustain hyperpolarization-activated Ih current and suppress excitability in BLA pyramidal neurons, and its loss in prefrontal cortical pyramidal neurons drives autism- and anxiety-like behaviors through disrupted PL-dSTR and PL-BLA circuit activity."},"narrative":{"mechanistic_narrative":"TMEM74 is a multi-pass transmembrane protein that acts as a positive regulator of autophagy and, independently, modulates apoptosis and neuronal excitability [PMID:18294959, PMID:29048433, PMID:30886335]. Localized to lysosomes and autophagosomes, its overexpression drives autophagic vacuolization and LC3-II accumulation, while its loss abolishes starvation-induced autophagy [PMID:18294959]. Mechanistically, TMEM74 increases autophagic flux by physically interacting with the autophagy machinery components ATG16L1 and ATG9A, doing so independently of the BECN1/PI3KC3 complex and ULK1; it is itself degraded through autophagy, defining a self-limiting loop, and this activity promotes tumor cell survival under metabolic stress [PMID:29048433]. TMEM74 also restrains apoptosis: it co-localizes with and binds the pro-apoptotic protein BIK through a direct TM domain–BH3 domain interaction, and this inhibition of BIK-induced apoptosis is at least partly autophagy-independent [PMID:28412412]. In the nervous system, TMEM74 couples with HCN1 channels to support their surface expression and sustain hyperpolarization-activated Ih current, suppressing pyramidal neuron excitability via its TM1 domain; loss of Tmem74 in prefrontal cortical neurons disrupts PL→dorsal-striatum and PL→BLA circuit activity to produce autism- and anxiety-like behaviors [PMID:30886335, PMID:36690791].","teleology":[{"year":2008,"claim":"Established TMEM74 as an autophagy-active transmembrane protein by localizing it to lysosomes/autophagosomes and showing both gain- and loss-of-function effects on LC3 conversion.","evidence":"Subcellular localization, GFP-LC3/MDC assays, LC3-II immunoblot, wortmannin inhibition and siRNA knockdown in HeLa cells","pmids":["18294959"],"confidence":"Medium","gaps":["No binding partners or molecular mechanism identified","Single-lab characterization"]},{"year":2009,"claim":"Independently confirmed TMEM74 as an autophagy-inducing gene in an unbiased functional screen, reducing the chance the earlier effect was an overexpression artifact.","evidence":"High-throughput GFP-LC3 cell-based functional screen with cDNA library cotransfection","pmids":["19029833"],"confidence":"Medium","gaps":["Screen readout only; no mechanism for TMEM74 specifically","Does not address endogenous physiological role"]},{"year":2017,"claim":"Defined how TMEM74 engages the autophagy machinery, showing it binds ATG16L1 and ATG9A and induces flux bypassing the canonical BECN1/PI3KC3 and ULK1 steps.","evidence":"Reciprocal Co-IP, autophagic flux assays, pharmacological inhibitors, and knockdown across multiple tumor cell lines","pmids":["29048433"],"confidence":"High","gaps":["Structural basis of ATG16L1/ATG9A binding unresolved","Mechanism of TMEM74 self-degradation not detailed"]},{"year":2017,"claim":"Identified a distinct anti-apoptotic function via direct TMEM74 TM domain–BIK BH3 domain interaction, separating apoptosis suppression from the autophagy role.","evidence":"Co-IP, fluorescence co-localization, TM-deletion mutants, and autophagosome-formation inhibitor in cell lines","pmids":["28412412"],"confidence":"High","gaps":["Quantitative contribution of autophagy-dependent vs -independent inhibition unclear","No structural model of the TM–BH3 interface"]},{"year":2019,"claim":"Revealed an unanticipated neuronal function in which TMEM74 couples with HCN1 to control Ih current and excitability, linking the protein to behavior.","evidence":"Tmem74-/- and BLA-targeted knockdown, whole-cell Ih electrophysiology, HCN1 surface-expression assay, TM1 mutant, viral rescue, behavioral assays in mice","pmids":["30886335"],"confidence":"High","gaps":["Whether TMEM74 binds HCN1 directly is not established","Connection between autophagy/apoptosis roles and HCN1 regulation unknown"]},{"year":2023,"claim":"Mapped TMEM74-dependent prefrontal circuits, showing distinct PL→dSTR and PL→BLA projections separately mediate autism- and anxiety-like behaviors.","evidence":"Conditional/global knockout, optogenetics, DREADD chemogenetics, excitability recordings, viral rescue, and behavioral assays","pmids":["36690791"],"confidence":"High","gaps":["Molecular effector linking TMEM74 loss to PL PN hyperexcitability not pinned to HCN1 here","Human relevance of the autism-like phenotype untested"]},{"year":2026,"claim":"Placed TMEM74 as a candidate downstream effector of SIRT7-mediated H3K79 desuccinylation governing autophagy and survival in granulosa cells.","evidence":"siRNA knockdown, autophagy-marker immunoblot, viability/apoptosis assays, and transcriptomics in goat ovarian granulosa cells","pmids":["42061017"],"confidence":"Low","gaps":["Single-method knockdown with limited mechanistic follow-up; TMEM74 is a candidate, not the focus","Direct regulation of TMEM74 by SIRT7 not demonstrated","Not validated in mammalian/human cells"]},{"year":null,"claim":"How TMEM74's autophagy-promoting, apoptosis-inhibiting, and HCN1-coupling activities are mechanistically integrated within a single transmembrane protein remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural data on TMEM74 or its membrane topology","Whether HCN1 trafficking depends on autophagy is unknown","No reported human disease-causing mutation"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,4]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,4]}],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[0,2]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,5]}],"complexes":[],"partners":["ATG16L1","ATG9A","BIK","HCN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96NL1","full_name":"Transmembrane protein 74","aliases":[],"length_aa":305,"mass_kda":33.3,"function":"Plays an essential role in autophagy. TMEM74-induced autophagy may involve PI3K signal transduction","subcellular_location":"Lysosome membrane; Cytoplasmic vesicle, autophagosome membrane","url":"https://www.uniprot.org/uniprotkb/Q96NL1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TMEM74","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TMEM74","total_profiled":1310},"omim":[{"mim_id":"613935","title":"TRANSMEMBRANE PROTEIN 74; TMEM74","url":"https://www.omim.org/entry/613935"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":2.7},{"tissue":"retina","ntpm":2.3}],"url":"https://www.proteinatlas.org/search/TMEM74"},"hgnc":{"alias_symbol":["FLJ30668","NET36"],"prev_symbol":[]},"alphafold":{"accession":"Q96NL1","domains":[{"cath_id":"1.10.287","chopping":"174-201_217-269","consensus_level":"medium","plddt":77.2753,"start":174,"end":269}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96NL1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96NL1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96NL1-F1-predicted_aligned_error_v6.png","plddt_mean":56.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TMEM74","jax_strain_url":"https://www.jax.org/strain/search?query=TMEM74"},"sequence":{"accession":"Q96NL1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96NL1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96NL1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96NL1"}},"corpus_meta":[{"pmid":"19029833","id":"PMC_19029833","title":"High-throughput functional screening for autophagy-related genes and identification of TM9SF1 as an autophagosome-inducing gene.","date":"2009","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/19029833","citation_count":73,"is_preprint":false},{"pmid":"18294959","id":"PMC_18294959","title":"TMEM74, a lysosome and autophagosome protein, regulates autophagy.","date":"2008","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/18294959","citation_count":53,"is_preprint":false},{"pmid":"23759441","id":"PMC_23759441","title":"Lithium treatment increases endothelial cell survival and autophagy in a mouse model of Fuchs endothelial corneal dystrophy.","date":"2013","source":"The British journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/23759441","citation_count":46,"is_preprint":false},{"pmid":"37936608","id":"PMC_37936608","title":"The transmembrane proteins (TMEM) and their role in cell proliferation, migration, invasion, and epithelial-mesenchymal transition in cancer.","date":"2023","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/37936608","citation_count":42,"is_preprint":false},{"pmid":"24034811","id":"PMC_24034811","title":"Methylation profiling and evaluation of demethylating therapy in renal cell carcinoma.","date":"2013","source":"Clinical epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/24034811","citation_count":32,"is_preprint":false},{"pmid":"36690791","id":"PMC_36690791","title":"Divergent projections of the prelimbic cortex mediate autism- and anxiety-like behaviors.","date":"2023","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/36690791","citation_count":27,"is_preprint":false},{"pmid":"29048433","id":"PMC_29048433","title":"TMEM74 promotes tumor cell survival by inducing autophagy via interactions with ATG16L1 and ATG9A.","date":"2017","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/29048433","citation_count":25,"is_preprint":false},{"pmid":"30886335","id":"PMC_30886335","title":"Functional coupling of Tmem74 and HCN1 channels regulates anxiety-like behavior in BLA neurons.","date":"2019","source":"Molecular psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/30886335","citation_count":21,"is_preprint":false},{"pmid":"33011366","id":"PMC_33011366","title":"SANT, a novel Chinese herbal monomer combination, decreasing tumor growth and angiogenesis via modulating autophagy in heparanase overexpressed triple-negative breast cancer.","date":"2020","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/33011366","citation_count":19,"is_preprint":false},{"pmid":"28412412","id":"PMC_28412412","title":"Autophagy regulatory molecule, TMEM74, interacts with BIK and inhibits BIK-induced apoptosis.","date":"2017","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/28412412","citation_count":15,"is_preprint":false},{"pmid":"29629952","id":"PMC_29629952","title":"The Expression of TMEM74 in Liver Cancer and Lung Cancer Correlating With Survival Outcomes.","date":"2019","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/29629952","citation_count":10,"is_preprint":false},{"pmid":"31560972","id":"PMC_31560972","title":"Mycophenolic acid (MPA) modulates host cellular autophagy progression in sub genomic dengue virus-2 replicon cells.","date":"2019","source":"Microbial pathogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/31560972","citation_count":10,"is_preprint":false},{"pmid":"34132174","id":"PMC_34132174","title":"Genome-wide association study detected novel susceptibility genes for social cognition impairment in people with schizophrenia.","date":"2021","source":"The world journal of biological psychiatry : the official journal of the World Federation of Societies of Biological Psychiatry","url":"https://pubmed.ncbi.nlm.nih.gov/34132174","citation_count":8,"is_preprint":false},{"pmid":"33236465","id":"PMC_33236465","title":"Super-variants identification for brain connectivity.","date":"2020","source":"Human brain mapping","url":"https://pubmed.ncbi.nlm.nih.gov/33236465","citation_count":7,"is_preprint":false},{"pmid":"38276004","id":"PMC_38276004","title":"Rapamycin as a Potential Alternative Drug for Squamous Cell Gingiva Carcinoma (Ca9-22): A Focus on Cell Cycle, Apoptosis and Autophagy Genetic Profile.","date":"2024","source":"Pharmaceuticals (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/38276004","citation_count":3,"is_preprint":false},{"pmid":"40644891","id":"PMC_40644891","title":"Biomarker discovery for early breast cancer diagnosis using machine learning on transcriptomic data for biosensor development.","date":"2025","source":"Computers in biology and medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40644891","citation_count":2,"is_preprint":false},{"pmid":"37690223","id":"PMC_37690223","title":"High-throughput screening and clinical importance of autophagy-associated genes in basal cell carcinoma.","date":"2023","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/37690223","citation_count":2,"is_preprint":false},{"pmid":"41436842","id":"PMC_41436842","title":"Transcriptomic decoding of regional cortical vulnerability to drug-resistant epilepsy using 7T MRI.","date":"2025","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/41436842","citation_count":1,"is_preprint":false},{"pmid":"42061017","id":"PMC_42061017","title":"SIRT7-mediated H3K79 desuccinylation modulates functional activities of goat ovarian granulosa cells.","date":"2026","source":"Theriogenology","url":"https://pubmed.ncbi.nlm.nih.gov/42061017","citation_count":0,"is_preprint":false},{"pmid":"42259854","id":"PMC_42259854","title":"Integrative machine learning and multi-omics analysis reveals ATIC as a promoter of hepatocellular carcinoma progression.","date":"2026","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/42259854","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13114,"output_tokens":2117,"usd":0.035548,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9120,"output_tokens":2688,"usd":0.0564,"stage2_stop_reason":"end_turn"},"total_usd":0.091948,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"TMEM74 localizes to lysosomes and autophagosomes; overexpression in HeLa cells induces autophagic vacuolization, increases GFP-LC3 dot formation, and elevates endogenous LC3-II levels; these effects are partially attenuated by the autophagy inhibitor wortmannin; siRNA knockdown of TMEM74 abolishes starvation-induced autophagy.\",\n      \"method\": \"Northern blot, subcellular localization (fluorescence microscopy), GFP-LC3 assay, MDC staining, immunoblotting for LC3-II, wortmannin inhibition, siRNA knockdown\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (localization, overexpression, siRNA KD, LC3-II western blot) in a single lab\",\n      \"pmids\": [\"18294959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TMEM74 overexpression induces high levels of autophagosome formation (GFP-LC3 dots) in a high-throughput functional screen; confirmed as an autophagy-inducing gene.\",\n      \"method\": \"High-throughput cell-based functional screen with automated fluorescence microscopy (GFP-LC3), cotransfection of cDNA library\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional screen with GFP-LC3 readout, replicated finding from PMID:18294959, single method for TMEM74 specifically\",\n      \"pmids\": [\"19029833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TMEM74 increases autophagic flux and interacts with ATG16L1 (involved in autophagosome nucleation) and ATG9A (involved in membrane elongation); this autophagy induction is independent of the BECN1/PI3KC3 complex and ULK1; TMEM74 itself is downregulated through the autophagic process, suggesting a self-regulatory loop; TMEM74-induced autophagy promotes tumor cell survival under metabolic stress.\",\n      \"method\": \"Co-immunoprecipitation (interaction with ATG16L1 and ATG9A), autophagic flux assays, autophagy inhibitor studies, knockdown experiments, multiple tumor cell lines\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP for two binding partners, multiple orthogonal methods (flux assay, KD, OE, pharmacological inhibitors), multiple cell lines, single lab\",\n      \"pmids\": [\"29048433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TMEM74 co-localizes with the pro-apoptotic protein BIK in subcellular organelles and physically interacts with BIK via the TM domains of TMEM74 and the BH3 domain of BIK; TMEM74 inhibits BIK-induced apoptosis through this interaction; TM domain-deficient TMEM74 mutant loses this inhibitory function; autophagosome formation inhibitor does not fully block the inhibition, indicating the effect is partly independent of autophagy.\",\n      \"method\": \"Co-immunoprecipitation, fluorescence co-localization, immunoblotting, domain-deletion mutants (TM-deficient TMEM74), autophagosome formation inhibitor, knockdown\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, co-localization, domain mutagenesis, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"28412412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TMEM74 functionally couples with HCN1 channels in basolateral amygdala (BLA) pyramidal neurons: genetic deletion or knockdown of Tmem74 reduces surface expression of HCN1, lowers hyperpolarization-activated cation current (Ih), and increases neuronal excitability; transmembrane domain 1 (TM1) of TMEM74 is essential for its membrane localization and enhancement of Ih; Tmem74 overexpression restores HCN1 trafficking and neuronal excitability; Tmem74-/- mice show anxiety-like behaviors reversed by Tmem74 re-expression.\",\n      \"method\": \"Genetic knockout (Tmem74-/-), selective BLA knockdown, whole-cell electrophysiology (Ih recordings), surface expression assay for HCN1, domain mutant analysis (TM1), viral re-expression, behavioral assays\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KO, KD, electrophysiology, surface expression, domain mutants, rescue), functional behavioral validation\",\n      \"pmids\": [\"30886335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Tmem74-/- mice exhibit autism- and anxiety-like behaviors with increased excitability of pyramidal neurons (PNs) in the prelimbic cortex (PL); conditional deletion of Tmem74 in PL PNs revealed that PL→dorsal striatum fast-spiking interneuron projections mediate autism-like behaviors and hyperexcitability of FSIs, while PL→BLA PN projections mediate anxiety-like behaviors; optogenetic manipulation of PL-dSTR or PL-BLA circuits recapitulates these behavioral phenotypes; Tmem74 re-expression and chemogenetic inhibition of PL PNs reverse these behaviors.\",\n      \"method\": \"Conditional/global knockout, chemogenetic inhibition (DREADD), optogenetics, electrophysiology (excitability recordings), viral re-expression, behavioral assays\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (cKO, optogenetics, chemogenetics, electrophysiology, circuit-level dissection, rescue), rigorous circuit-level mechanistic dissection\",\n      \"pmids\": [\"36690791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In goat ovarian granulosa cells, TMEM74 knockdown is associated with altered autophagy-related markers, reduced cell viability, and increased apoptosis; TMEM74 was identified as a candidate downstream effector in a pathway linking SIRT7-mediated H3K79 desuccinylation to autophagy regulation.\",\n      \"method\": \"siRNA knockdown of TMEM74, autophagy marker immunoblotting, cell viability assay, apoptosis assay, transcriptomic analysis\",\n      \"journal\": \"Theriogenology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single-method knockdown with limited mechanistic follow-up; TMEM74 is a candidate identified downstream of another protein, not the primary focus\",\n      \"pmids\": [\"42061017\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TMEM74 is a lysosome/autophagosome transmembrane protein that promotes autophagy by physically interacting with ATG16L1 and ATG9A through a BECN1/PI3KC3- and ULK1-independent mechanism; it inhibits BIK-induced apoptosis via a direct TM domain–BH3 domain interaction; in neurons, TMEM74 couples with HCN1 channels—requiring its TM1 domain for membrane localization—to sustain hyperpolarization-activated Ih current and suppress excitability in BLA pyramidal neurons, and its loss in prefrontal cortical pyramidal neurons drives autism- and anxiety-like behaviors through disrupted PL-dSTR and PL-BLA circuit activity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TMEM74 is a multi-pass transmembrane protein that acts as a positive regulator of autophagy and, independently, modulates apoptosis and neuronal excitability [#0, #2, #4]. Localized to lysosomes and autophagosomes, its overexpression drives autophagic vacuolization and LC3-II accumulation, while its loss abolishes starvation-induced autophagy [#0]. Mechanistically, TMEM74 increases autophagic flux by physically interacting with the autophagy machinery components ATG16L1 and ATG9A, doing so independently of the BECN1/PI3KC3 complex and ULK1; it is itself degraded through autophagy, defining a self-limiting loop, and this activity promotes tumor cell survival under metabolic stress [#2]. TMEM74 also restrains apoptosis: it co-localizes with and binds the pro-apoptotic protein BIK through a direct TM domain\\u2013BH3 domain interaction, and this inhibition of BIK-induced apoptosis is at least partly autophagy-independent [#3]. In the nervous system, TMEM74 couples with HCN1 channels to support their surface expression and sustain hyperpolarization-activated Ih current, suppressing pyramidal neuron excitability via its TM1 domain; loss of Tmem74 in prefrontal cortical neurons disrupts PL\\u2192dorsal-striatum and PL\\u2192BLA circuit activity to produce autism- and anxiety-like behaviors [#4, #5].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established TMEM74 as an autophagy-active transmembrane protein by localizing it to lysosomes/autophagosomes and showing both gain- and loss-of-function effects on LC3 conversion.\",\n      \"evidence\": \"Subcellular localization, GFP-LC3/MDC assays, LC3-II immunoblot, wortmannin inhibition and siRNA knockdown in HeLa cells\",\n      \"pmids\": [\"18294959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No binding partners or molecular mechanism identified\", \"Single-lab characterization\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Independently confirmed TMEM74 as an autophagy-inducing gene in an unbiased functional screen, reducing the chance the earlier effect was an overexpression artifact.\",\n      \"evidence\": \"High-throughput GFP-LC3 cell-based functional screen with cDNA library cotransfection\",\n      \"pmids\": [\"19029833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Screen readout only; no mechanism for TMEM74 specifically\", \"Does not address endogenous physiological role\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined how TMEM74 engages the autophagy machinery, showing it binds ATG16L1 and ATG9A and induces flux bypassing the canonical BECN1/PI3KC3 and ULK1 steps.\",\n      \"evidence\": \"Reciprocal Co-IP, autophagic flux assays, pharmacological inhibitors, and knockdown across multiple tumor cell lines\",\n      \"pmids\": [\"29048433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ATG16L1/ATG9A binding unresolved\", \"Mechanism of TMEM74 self-degradation not detailed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified a distinct anti-apoptotic function via direct TMEM74 TM domain\\u2013BIK BH3 domain interaction, separating apoptosis suppression from the autophagy role.\",\n      \"evidence\": \"Co-IP, fluorescence co-localization, TM-deletion mutants, and autophagosome-formation inhibitor in cell lines\",\n      \"pmids\": [\"28412412\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of autophagy-dependent vs -independent inhibition unclear\", \"No structural model of the TM\\u2013BH3 interface\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed an unanticipated neuronal function in which TMEM74 couples with HCN1 to control Ih current and excitability, linking the protein to behavior.\",\n      \"evidence\": \"Tmem74-/- and BLA-targeted knockdown, whole-cell Ih electrophysiology, HCN1 surface-expression assay, TM1 mutant, viral rescue, behavioral assays in mice\",\n      \"pmids\": [\"30886335\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TMEM74 binds HCN1 directly is not established\", \"Connection between autophagy/apoptosis roles and HCN1 regulation unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mapped TMEM74-dependent prefrontal circuits, showing distinct PL\\u2192dSTR and PL\\u2192BLA projections separately mediate autism- and anxiety-like behaviors.\",\n      \"evidence\": \"Conditional/global knockout, optogenetics, DREADD chemogenetics, excitability recordings, viral rescue, and behavioral assays\",\n      \"pmids\": [\"36690791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular effector linking TMEM74 loss to PL PN hyperexcitability not pinned to HCN1 here\", \"Human relevance of the autism-like phenotype untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Placed TMEM74 as a candidate downstream effector of SIRT7-mediated H3K79 desuccinylation governing autophagy and survival in granulosa cells.\",\n      \"evidence\": \"siRNA knockdown, autophagy-marker immunoblot, viability/apoptosis assays, and transcriptomics in goat ovarian granulosa cells\",\n      \"pmids\": [\"42061017\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single-method knockdown with limited mechanistic follow-up; TMEM74 is a candidate, not the focus\", \"Direct regulation of TMEM74 by SIRT7 not demonstrated\", \"Not validated in mammalian/human cells\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TMEM74's autophagy-promoting, apoptosis-inhibiting, and HCN1-coupling activities are mechanistically integrated within a single transmembrane protein remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural data on TMEM74 or its membrane topology\", \"Whether HCN1 trafficking depends on autophagy is unknown\", \"No reported human disease-causing mutation\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ATG16L1\", \"ATG9A\", \"BIK\", \"HCN1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}