{"gene":"TMEM192","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2007,"finding":"TMEM192 (encoded by LOC201931/FLJ38482) was identified as an integral lysosomal membrane protein by mass spectrometry-based proteomics of purified placental lysosomal membranes, and confirmed to localize to lysosomal organelles when expressed as a fluorescent fusion protein in HeLa cells.","method":"Organellar proteomics (mass spectrometry of purified lysosomal membranes) + fluorescent tag overexpression in HeLa cells","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 — proteomics identification confirmed by fluorescence localization; single study","pmids":["17897319"],"is_preprint":false},{"year":2010,"finding":"TMEM192 localizes to lysosomal/late endosomal membranes, possesses four transmembrane segments, is not N-glycosylated, and forms homodimers linked by interchain disulfide bridges, as shown by co-immunoprecipitation, Western blotting under reducing/non-reducing conditions, Percoll density gradient co-sedimentation with LAMP-2 and cathepsin D, and immunofluorescence co-localization with lysosomal markers.","method":"Co-immunoprecipitation, non-reducing SDS-PAGE/Western blot, Percoll density gradient centrifugation, immunofluorescence with lysosomal markers, antibody generation and validation","journal":"Biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal biochemical methods (co-IP, density gradient, non-reducing Western blot) in a single study with rigorous controls","pmids":["20370317"],"is_preprint":false},{"year":2011,"finding":"TMEM192 is targeted to late endosomes/lysosomes via two adjacent N-terminal dileucine motifs of the DXXLL-type; disruption of both motifs causes mistargeting to the plasma membrane, while each motif alone is sufficient for correct targeting. The C-terminal Cys266 residue forms the interchain disulfide bond responsible for TMEM192 homodimerization, and both N- and C-termini face the cytosol.","method":"CD4 chimeric construct mutagenesis, site-directed mutagenesis of dileucine motifs and cysteine residues, immunogold labeling, proteinase protection assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of targeting motifs and disulfide-forming residue with multiple structural/topology assays; rigorous controls","pmids":["21143193"],"is_preprint":false},{"year":2012,"finding":"Knockdown of TMEM192 in HepG2 hepatoma cells induces autophagy (increased LC3-II) and subsequent apoptosis via the mitochondrial pathway; the apoptosis is blocked by silencing the autophagy gene ATG7, placing TMEM192 upstream of ATG7-dependent autophagy in this cell death pathway.","method":"siRNA knockdown, LC3-II Western blot, apoptosis assays, epistasis by ATG7 co-knockdown","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis (ATG7 co-knockdown rescues apoptosis) with defined phenotypic readouts; single lab","pmids":["22736246"],"is_preprint":false},{"year":2016,"finding":"TMEM192 physically interacts with the tumor suppressor TIG1 (both TIG1A and TIG1B isoforms) at lysosomes, and is required for TIG1-mediated upregulation of autophagy (Beclin-1 and LC3-B induction); silencing TMEM192 reduces TIG1- and all-trans retinoic acid-induced autophagic activity.","method":"Yeast two-hybrid, co-immunoprecipitation, co-localization by fluorescence microscopy, siRNA knockdown with autophagy marker readout","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 3 — yeast two-hybrid plus co-localization and co-IP; functional link via KD with autophagy markers; single lab","pmids":["27989102"],"is_preprint":false},{"year":2017,"finding":"TMEM192 is ubiquitinated by the SCF-FBXO27 E3 ubiquitin ligase complex upon lysosomal damage, identified in a screen for substrates of glycoprotein-directed ubiquitination during lysophagy.","method":"Ubiquitination screen upon lysosomal damage, FBXO27 overexpression, mass spectrometry identification of ubiquitinated substrates","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — substrate identified in a defined damage context with overexpression of the E3 ligase; single study","pmids":["28743755"],"is_preprint":false},{"year":2017,"finding":"Murine TMEM192 resides in lysosomes, is ubiquitously expressed, undergoes tissue-specific proteolytic processing by pH-dependent lysosomal proteases to generate a 17 kDa fragment, and TMEM192-knockout MEFs display normal lysosomal morphology, autophagy, and lysosomal exocytosis under basal conditions.","method":"Immunofluorescence, Western blot, Percoll gradient, TMEM192-/- knockout mouse generation and analysis, histopathology, biochemical assays of autophagy and lysosomal exocytosis","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout in mouse with multiple orthogonal functional readouts; replicated localization data","pmids":["28504966"],"is_preprint":false},{"year":2019,"finding":"TMEM192 tagged with 3xHA on the lysosomal membrane enables highly efficient immunoprecipitation-based lysosome enrichment (LysoIP), outperforming density gradient and nanoparticle approaches with enrichment factors up to 118-fold for lysosomal proteins.","method":"Comparative organelle enrichment by immunoprecipitation of 3xHA-TMEM192, data-independent acquisition mass spectrometry, benchmarking against sucrose gradient and SPION methods","journal":"Journal of proteome research","confidence":"High","confidence_rationale":"Tier 2 — systematic multi-method comparison validating TMEM192 as an integral lysosomal membrane anchor for organelle isolation","pmids":["31738065"],"is_preprint":false},{"year":2024,"finding":"Multiplexed DNA-PAINT super-resolution imaging using TMEM192 as a lysosomal marker revealed that TMEM192 marks a specific subpopulation of late endosomes/lysosomes, distinct from LAMP1/LAMP2-ubiquitous populations, identifying up to eight LEL subpopulations with unique protein compositions.","method":"Multiplexed DNA-PAINT super-resolution fluorescence imaging with quantitative single-organelle analysis","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct quantitative imaging with single-organelle resolution; single study","pmids":["39485275"],"is_preprint":false},{"year":2024,"finding":"Endogenous TMEM192 can be immunoprecipitated without any exogenous tag to rapidly isolate intact native lysosomes from clinical samples (PBMCs from blood) and iPSC-derived neurons, enabling multimodal omics analysis of lysosomal content.","method":"Tagless immunoprecipitation of endogenous TMEM192, mass spectrometry-based metabolomics and proteomics of isolated lysosomes, validation in CLN3 patient samples","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal omics methods on intact isolated organelles; validated in disease patient samples with disease-relevant findings","pmids":["39724071"],"is_preprint":false},{"year":2025,"finding":"TBK1 phosphorylates FBXO3, facilitating FBXO3 interaction with TMEM192 and promoting TMEM192 ubiquitination; ubiquitinated TMEM192 is then recognized by the autophagy receptor TAX1BP1, driving lysophagic flux. Disruption of this TBK1-SCFFBXO3-TMEM192-TAX1BP1 axis reduces lysophagic flux and causes accumulation of damaged lysosomes.","method":"Kinase activity assay (TBK1 phosphorylation of FBXO3), co-immunoprecipitation (FBXO3-TMEM192 interaction), ubiquitination assay, autophagy flux measurement, loss-of-function perturbation","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway defined by kinase activity, interaction, ubiquitination assay, and receptor recruitment; single study","pmids":["40083080"],"is_preprint":false}],"current_model":"TMEM192 is an integral four-pass lysosomal/late endosomal membrane protein that forms cytosol-facing homodimers via a C-terminal disulfide bond (Cys266), is targeted to lysosomes by two N-terminal DXXLL-type dileucine motifs, and serves as a substrate for ubiquitination (by SCFFBXO27 and SCFFBXO3 downstream of TBK1) upon lysosomal damage, with ubiquitinated TMEM192 recognized by TAX1BP1 to drive lysophagy; additionally, TMEM192 interacts with TIG1 to promote autophagy, and its abundant, stable lysosomal membrane localization is widely exploited as an anchor for immunoprecipitation-based lysosome isolation (LysoIP)."},"narrative":{"teleology":[{"year":2007,"claim":"Establishing TMEM192 as a bona fide lysosomal membrane protein resolved the cellular compartment for this previously uncharacterized open reading frame.","evidence":"Mass spectrometry of purified placental lysosomal membranes with fluorescent-tag confirmation in HeLa cells","pmids":["17897319"],"confidence":"Medium","gaps":["No functional role assigned","Single proteomics study without genetic validation","Membrane topology not determined"]},{"year":2010,"claim":"Demonstrating that TMEM192 is a non-glycosylated four-pass transmembrane homodimer established its fundamental biochemical architecture.","evidence":"Co-immunoprecipitation, non-reducing SDS-PAGE, Percoll gradient co-sedimentation with LAMP-2 and cathepsin D","pmids":["20370317"],"confidence":"High","gaps":["Dimerization residue not yet mapped","Functional consequence of dimerization unknown","Targeting signals not identified"]},{"year":2011,"claim":"Mapping the two DXXLL dileucine targeting motifs and identifying Cys266 as the interchain disulfide residue resolved how TMEM192 reaches lysosomes and how it dimerizes.","evidence":"CD4 chimeric constructs, site-directed mutagenesis of dileucine motifs and Cys266, immunogold labeling, proteinase protection assay","pmids":["21143193"],"confidence":"High","gaps":["Adaptor protein(s) recognizing the dileucine motifs not identified","Functional role of TMEM192 at the lysosome still unknown","Whether dimerization is required for function untested"]},{"year":2012,"claim":"Showing that TMEM192 knockdown induces autophagy and ATG7-dependent apoptosis provided the first functional link between TMEM192 and autophagic/cell death pathways.","evidence":"siRNA knockdown in HepG2 cells, LC3-II immunoblotting, epistasis with ATG7 co-knockdown","pmids":["22736246"],"confidence":"Medium","gaps":["Mechanism by which TMEM192 loss triggers autophagy not defined","Phenotype observed only in one cancer cell line","In vivo relevance not tested"]},{"year":2016,"claim":"Identification of TIG1 as a TMEM192-interacting partner that requires TMEM192 for autophagy induction linked TMEM192 to a tumor suppressor signaling axis at lysosomes.","evidence":"Yeast two-hybrid, co-immunoprecipitation, fluorescence co-localization, siRNA knockdown with Beclin-1/LC3-B readout","pmids":["27989102"],"confidence":"Medium","gaps":["Direct binding interface not mapped","Downstream signaling from TIG1-TMEM192 not characterized","Single laboratory finding"]},{"year":2017,"claim":"Two key advances: TMEM192 was identified as a substrate of SCF-FBXO27-mediated ubiquitination upon lysosomal damage, and TMEM192-knockout mice showed normal basal lysosomal function, indicating context-dependent rather than housekeeping roles.","evidence":"FBXO27 overexpression with ubiquitination/mass spectrometry screen; TMEM192−/− mouse with histopathology, autophagy, and exocytosis assays","pmids":["28743755","28504966"],"confidence":"High","gaps":["Damage-specific lysophagy phenotype not tested in knockout","Redundancy with other lysosomal membrane proteins not addressed","FBXO27-TMEM192 interaction mechanism not defined"]},{"year":2019,"claim":"Systematic benchmarking of TMEM192-based LysoIP demonstrated that its stable, abundant lysosomal residence enables 118-fold enrichment, establishing a widely adopted organelle isolation technology.","evidence":"Comparative immunoprecipitation of 3×HA-TMEM192 vs. sucrose gradient and SPION methods, data-independent acquisition mass spectrometry","pmids":["31738065"],"confidence":"High","gaps":["Whether TMEM192-tagged lysosomes represent the full lysosome population or a subpopulation not assessed","Potential overexpression artifacts not excluded"]},{"year":2024,"claim":"Super-resolution imaging revealed TMEM192 marks a specific late endosome/lysosome subpopulation distinct from LAMP1/LAMP2-positive vesicles, and tagless immunoprecipitation of endogenous TMEM192 enabled native lysosome isolation from clinical samples.","evidence":"Multiplexed DNA-PAINT single-organelle imaging; tagless IP with multi-omics from PBMCs and iPSC-derived neurons","pmids":["39485275","39724071"],"confidence":"High","gaps":["Functional significance of TMEM192-specific subpopulation unknown","Whether subpopulation identity varies across tissues not established"]},{"year":2025,"claim":"Delineation of the TBK1→FBXO3→TMEM192 ubiquitination→TAX1BP1 recognition axis completed the lysophagy signaling cascade from kinase activation to autophagic receptor engagement.","evidence":"TBK1 kinase assay, FBXO3-TMEM192 co-immunoprecipitation, ubiquitination assay, lysophagic flux measurement with loss-of-function perturbation","pmids":["40083080"],"confidence":"Medium","gaps":["Specific ubiquitination sites on TMEM192 not mapped","Relative contributions of FBXO27 vs. FBXO3 pathways in vivo not distinguished","Single study awaiting independent replication"]},{"year":null,"claim":"The physiological function of TMEM192 beyond damage-induced lysophagy remains undefined — its role in unstressed conditions, the significance of its subpopulation-restricted distribution, and whether its dimerization is functionally required are unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No non-redundant basal phenotype identified in knockout animals","Structural basis of TMEM192 interactions not determined","Relationship between TMEM192 subpopulation identity and lysophagy competence unknown"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0,1,2,6,7,8,9]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[1,2,8]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,4,5,10]}],"complexes":[],"partners":["TIG1","FBXO27","FBXO3","TAX1BP1","TBK1"],"other_free_text":[]},"mechanistic_narrative":"TMEM192 is an integral lysosomal membrane protein that functions as a damage-responsive signal for lysophagy and participates in autophagy regulation. It is a four-pass transmembrane protein that forms homodimers via a C-terminal Cys266 disulfide bond, is targeted to late endosomes/lysosomes through two N-terminal DXXLL-type dileucine motifs, and marks a specific subpopulation of late endosomes/lysosomes distinct from LAMP1/LAMP2-ubiquitous populations [PMID:21143193, PMID:20370317, PMID:39485275]. Upon lysosomal damage, TMEM192 is ubiquitinated by SCF-FBXO27 and by SCF-FBXO3 downstream of TBK1 phosphorylation, and ubiquitinated TMEM192 is recognized by the autophagy receptor TAX1BP1 to drive lysophagic clearance of damaged lysosomes [PMID:28743755, PMID:40083080]. TMEM192 also interacts with the tumor suppressor TIG1 to promote Beclin-1- and LC3-dependent autophagy, and its abundant, stable residence on the lysosomal membrane has been widely exploited as an anchor for immunoprecipitation-based isolation of intact lysosomes from cell lines and primary clinical material [PMID:27989102, PMID:31738065, PMID:39724071]."},"prefetch_data":{"uniprot":{"accession":"Q8IY95","full_name":"Transmembrane protein 192","aliases":[],"length_aa":271,"mass_kda":30.9,"function":"","subcellular_location":"Lysosome membrane; Late endosome","url":"https://www.uniprot.org/uniprotkb/Q8IY95/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TMEM192","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000170088","cell_line_id":"CID001874","localizations":[{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"LAMP2","stoichiometry":10.0},{"gene":"ARL8B","stoichiometry":0.2},{"gene":"LAMP1","stoichiometry":0.2},{"gene":"LAMTOR2","stoichiometry":0.2},{"gene":"SLC12A2","stoichiometry":0.2},{"gene":"MYO1B","stoichiometry":0.2},{"gene":"ACTR6","stoichiometry":0.2},{"gene":"PWWP2A","stoichiometry":0.2},{"gene":"TMEM106B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001874","total_profiled":1310},"omim":[{"mim_id":"620677","title":"TRANSMEMBRANE PROTEIN 192; TMEM192","url":"https://www.omim.org/entry/620677"},{"mim_id":"605090","title":"RETINOIC ACID RECEPTOR RESPONDER 1; RARRES1","url":"https://www.omim.org/entry/605090"},{"mim_id":"603019","title":"CADHERIN 18; CDH18","url":"https://www.omim.org/entry/603019"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endosomes","reliability":"Supported"},{"location":"Lysosomes","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TMEM192"},"hgnc":{"alias_symbol":["FLJ38482"],"prev_symbol":[]},"alphafold":{"accession":"Q8IY95","domains":[{"cath_id":"1.20.120","chopping":"47-209","consensus_level":"high","plddt":86.223,"start":47,"end":209},{"cath_id":"1.20.5","chopping":"230-263","consensus_level":"medium","plddt":86.7935,"start":230,"end":263}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IY95","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IY95-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IY95-F1-predicted_aligned_error_v6.png","plddt_mean":76.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TMEM192","jax_strain_url":"https://www.jax.org/strain/search?query=TMEM192"},"sequence":{"accession":"Q8IY95","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IY95.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IY95/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IY95"}},"corpus_meta":[{"pmid":"17897319","id":"PMC_17897319","title":"Integral 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and lyso-IP toolkit for endolysosomal profiling of human-induced neurons.","date":"2024","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/39636867","citation_count":13,"is_preprint":false},{"pmid":"28504966","id":"PMC_28504966","title":"Functional characterization of the lysosomal membrane protein TMEM192 in mice.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/28504966","citation_count":11,"is_preprint":false},{"pmid":"39724071","id":"PMC_39724071","title":"Tagless LysoIP for immunoaffinity enrichment of native lysosomes from clinical samples.","date":"2024","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/39724071","citation_count":11,"is_preprint":false},{"pmid":"37772772","id":"PMC_37772772","title":"Direct regulation of FNIP1 and FNIP2 by MEF2 sustains MTORC1 activation and tumor progression in pancreatic 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spectrometry-based proteomics of purified placental lysosomal membranes, and confirmed to localize to lysosomal organelles when expressed as a fluorescent fusion protein in HeLa cells.\",\n      \"method\": \"Organellar proteomics (mass spectrometry of purified lysosomal membranes) + fluorescent tag overexpression in HeLa cells\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics identification confirmed by fluorescence localization; single study\",\n      \"pmids\": [\"17897319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TMEM192 localizes to lysosomal/late endosomal membranes, possesses four transmembrane segments, is not N-glycosylated, and forms homodimers linked by interchain disulfide bridges, as shown by co-immunoprecipitation, Western blotting under reducing/non-reducing conditions, Percoll density gradient co-sedimentation with LAMP-2 and cathepsin D, and immunofluorescence co-localization with lysosomal markers.\",\n      \"method\": \"Co-immunoprecipitation, non-reducing SDS-PAGE/Western blot, Percoll density gradient centrifugation, immunofluorescence with lysosomal markers, antibody generation and validation\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical methods (co-IP, density gradient, non-reducing Western blot) in a single study with rigorous controls\",\n      \"pmids\": [\"20370317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TMEM192 is targeted to late endosomes/lysosomes via two adjacent N-terminal dileucine motifs of the DXXLL-type; disruption of both motifs causes mistargeting to the plasma membrane, while each motif alone is sufficient for correct targeting. The C-terminal Cys266 residue forms the interchain disulfide bond responsible for TMEM192 homodimerization, and both N- and C-termini face the cytosol.\",\n      \"method\": \"CD4 chimeric construct mutagenesis, site-directed mutagenesis of dileucine motifs and cysteine residues, immunogold labeling, proteinase protection assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of targeting motifs and disulfide-forming residue with multiple structural/topology assays; rigorous controls\",\n      \"pmids\": [\"21143193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Knockdown of TMEM192 in HepG2 hepatoma cells induces autophagy (increased LC3-II) and subsequent apoptosis via the mitochondrial pathway; the apoptosis is blocked by silencing the autophagy gene ATG7, placing TMEM192 upstream of ATG7-dependent autophagy in this cell death pathway.\",\n      \"method\": \"siRNA knockdown, LC3-II Western blot, apoptosis assays, epistasis by ATG7 co-knockdown\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis (ATG7 co-knockdown rescues apoptosis) with defined phenotypic readouts; single lab\",\n      \"pmids\": [\"22736246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TMEM192 physically interacts with the tumor suppressor TIG1 (both TIG1A and TIG1B isoforms) at lysosomes, and is required for TIG1-mediated upregulation of autophagy (Beclin-1 and LC3-B induction); silencing TMEM192 reduces TIG1- and all-trans retinoic acid-induced autophagic activity.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, co-localization by fluorescence microscopy, siRNA knockdown with autophagy marker readout\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — yeast two-hybrid plus co-localization and co-IP; functional link via KD with autophagy markers; single lab\",\n      \"pmids\": [\"27989102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TMEM192 is ubiquitinated by the SCF-FBXO27 E3 ubiquitin ligase complex upon lysosomal damage, identified in a screen for substrates of glycoprotein-directed ubiquitination during lysophagy.\",\n      \"method\": \"Ubiquitination screen upon lysosomal damage, FBXO27 overexpression, mass spectrometry identification of ubiquitinated substrates\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — substrate identified in a defined damage context with overexpression of the E3 ligase; single study\",\n      \"pmids\": [\"28743755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Murine TMEM192 resides in lysosomes, is ubiquitously expressed, undergoes tissue-specific proteolytic processing by pH-dependent lysosomal proteases to generate a 17 kDa fragment, and TMEM192-knockout MEFs display normal lysosomal morphology, autophagy, and lysosomal exocytosis under basal conditions.\",\n      \"method\": \"Immunofluorescence, Western blot, Percoll gradient, TMEM192-/- knockout mouse generation and analysis, histopathology, biochemical assays of autophagy and lysosomal exocytosis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout in mouse with multiple orthogonal functional readouts; replicated localization data\",\n      \"pmids\": [\"28504966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TMEM192 tagged with 3xHA on the lysosomal membrane enables highly efficient immunoprecipitation-based lysosome enrichment (LysoIP), outperforming density gradient and nanoparticle approaches with enrichment factors up to 118-fold for lysosomal proteins.\",\n      \"method\": \"Comparative organelle enrichment by immunoprecipitation of 3xHA-TMEM192, data-independent acquisition mass spectrometry, benchmarking against sucrose gradient and SPION methods\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic multi-method comparison validating TMEM192 as an integral lysosomal membrane anchor for organelle isolation\",\n      \"pmids\": [\"31738065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Multiplexed DNA-PAINT super-resolution imaging using TMEM192 as a lysosomal marker revealed that TMEM192 marks a specific subpopulation of late endosomes/lysosomes, distinct from LAMP1/LAMP2-ubiquitous populations, identifying up to eight LEL subpopulations with unique protein compositions.\",\n      \"method\": \"Multiplexed DNA-PAINT super-resolution fluorescence imaging with quantitative single-organelle analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct quantitative imaging with single-organelle resolution; single study\",\n      \"pmids\": [\"39485275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Endogenous TMEM192 can be immunoprecipitated without any exogenous tag to rapidly isolate intact native lysosomes from clinical samples (PBMCs from blood) and iPSC-derived neurons, enabling multimodal omics analysis of lysosomal content.\",\n      \"method\": \"Tagless immunoprecipitation of endogenous TMEM192, mass spectrometry-based metabolomics and proteomics of isolated lysosomes, validation in CLN3 patient samples\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal omics methods on intact isolated organelles; validated in disease patient samples with disease-relevant findings\",\n      \"pmids\": [\"39724071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TBK1 phosphorylates FBXO3, facilitating FBXO3 interaction with TMEM192 and promoting TMEM192 ubiquitination; ubiquitinated TMEM192 is then recognized by the autophagy receptor TAX1BP1, driving lysophagic flux. Disruption of this TBK1-SCFFBXO3-TMEM192-TAX1BP1 axis reduces lysophagic flux and causes accumulation of damaged lysosomes.\",\n      \"method\": \"Kinase activity assay (TBK1 phosphorylation of FBXO3), co-immunoprecipitation (FBXO3-TMEM192 interaction), ubiquitination assay, autophagy flux measurement, loss-of-function perturbation\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway defined by kinase activity, interaction, ubiquitination assay, and receptor recruitment; single study\",\n      \"pmids\": [\"40083080\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TMEM192 is an integral four-pass lysosomal/late endosomal membrane protein that forms cytosol-facing homodimers via a C-terminal disulfide bond (Cys266), is targeted to lysosomes by two N-terminal DXXLL-type dileucine motifs, and serves as a substrate for ubiquitination (by SCFFBXO27 and SCFFBXO3 downstream of TBK1) upon lysosomal damage, with ubiquitinated TMEM192 recognized by TAX1BP1 to drive lysophagy; additionally, TMEM192 interacts with TIG1 to promote autophagy, and its abundant, stable lysosomal membrane localization is widely exploited as an anchor for immunoprecipitation-based lysosome isolation (LysoIP).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TMEM192 is an integral lysosomal membrane protein that functions as a damage-responsive signal for lysophagy and participates in autophagy regulation. It is a four-pass transmembrane protein that forms homodimers via a C-terminal Cys266 disulfide bond, is targeted to late endosomes/lysosomes through two N-terminal DXXLL-type dileucine motifs, and marks a specific subpopulation of late endosomes/lysosomes distinct from LAMP1/LAMP2-ubiquitous populations [PMID:21143193, PMID:20370317, PMID:39485275]. Upon lysosomal damage, TMEM192 is ubiquitinated by SCF-FBXO27 and by SCF-FBXO3 downstream of TBK1 phosphorylation, and ubiquitinated TMEM192 is recognized by the autophagy receptor TAX1BP1 to drive lysophagic clearance of damaged lysosomes [PMID:28743755, PMID:40083080]. TMEM192 also interacts with the tumor suppressor TIG1 to promote Beclin-1- and LC3-dependent autophagy, and its abundant, stable residence on the lysosomal membrane has been widely exploited as an anchor for immunoprecipitation-based isolation of intact lysosomes from cell lines and primary clinical material [PMID:27989102, PMID:31738065, PMID:39724071].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing TMEM192 as a bona fide lysosomal membrane protein resolved the cellular compartment for this previously uncharacterized open reading frame.\",\n      \"evidence\": \"Mass spectrometry of purified placental lysosomal membranes with fluorescent-tag confirmation in HeLa cells\",\n      \"pmids\": [\"17897319\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional role assigned\", \"Single proteomics study without genetic validation\", \"Membrane topology not determined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating that TMEM192 is a non-glycosylated four-pass transmembrane homodimer established its fundamental biochemical architecture.\",\n      \"evidence\": \"Co-immunoprecipitation, non-reducing SDS-PAGE, Percoll gradient co-sedimentation with LAMP-2 and cathepsin D\",\n      \"pmids\": [\"20370317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dimerization residue not yet mapped\", \"Functional consequence of dimerization unknown\", \"Targeting signals not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mapping the two DXXLL dileucine targeting motifs and identifying Cys266 as the interchain disulfide residue resolved how TMEM192 reaches lysosomes and how it dimerizes.\",\n      \"evidence\": \"CD4 chimeric constructs, site-directed mutagenesis of dileucine motifs and Cys266, immunogold labeling, proteinase protection assay\",\n      \"pmids\": [\"21143193\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adaptor protein(s) recognizing the dileucine motifs not identified\", \"Functional role of TMEM192 at the lysosome still unknown\", \"Whether dimerization is required for function untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing that TMEM192 knockdown induces autophagy and ATG7-dependent apoptosis provided the first functional link between TMEM192 and autophagic/cell death pathways.\",\n      \"evidence\": \"siRNA knockdown in HepG2 cells, LC3-II immunoblotting, epistasis with ATG7 co-knockdown\",\n      \"pmids\": [\"22736246\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which TMEM192 loss triggers autophagy not defined\", \"Phenotype observed only in one cancer cell line\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of TIG1 as a TMEM192-interacting partner that requires TMEM192 for autophagy induction linked TMEM192 to a tumor suppressor signaling axis at lysosomes.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, fluorescence co-localization, siRNA knockdown with Beclin-1/LC3-B readout\",\n      \"pmids\": [\"27989102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface not mapped\", \"Downstream signaling from TIG1-TMEM192 not characterized\", \"Single laboratory finding\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Two key advances: TMEM192 was identified as a substrate of SCF-FBXO27-mediated ubiquitination upon lysosomal damage, and TMEM192-knockout mice showed normal basal lysosomal function, indicating context-dependent rather than housekeeping roles.\",\n      \"evidence\": \"FBXO27 overexpression with ubiquitination/mass spectrometry screen; TMEM192−/− mouse with histopathology, autophagy, and exocytosis assays\",\n      \"pmids\": [\"28743755\", \"28504966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Damage-specific lysophagy phenotype not tested in knockout\", \"Redundancy with other lysosomal membrane proteins not addressed\", \"FBXO27-TMEM192 interaction mechanism not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Systematic benchmarking of TMEM192-based LysoIP demonstrated that its stable, abundant lysosomal residence enables 118-fold enrichment, establishing a widely adopted organelle isolation technology.\",\n      \"evidence\": \"Comparative immunoprecipitation of 3×HA-TMEM192 vs. sucrose gradient and SPION methods, data-independent acquisition mass spectrometry\",\n      \"pmids\": [\"31738065\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TMEM192-tagged lysosomes represent the full lysosome population or a subpopulation not assessed\", \"Potential overexpression artifacts not excluded\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Super-resolution imaging revealed TMEM192 marks a specific late endosome/lysosome subpopulation distinct from LAMP1/LAMP2-positive vesicles, and tagless immunoprecipitation of endogenous TMEM192 enabled native lysosome isolation from clinical samples.\",\n      \"evidence\": \"Multiplexed DNA-PAINT single-organelle imaging; tagless IP with multi-omics from PBMCs and iPSC-derived neurons\",\n      \"pmids\": [\"39485275\", \"39724071\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of TMEM192-specific subpopulation unknown\", \"Whether subpopulation identity varies across tissues not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Delineation of the TBK1→FBXO3→TMEM192 ubiquitination→TAX1BP1 recognition axis completed the lysophagy signaling cascade from kinase activation to autophagic receptor engagement.\",\n      \"evidence\": \"TBK1 kinase assay, FBXO3-TMEM192 co-immunoprecipitation, ubiquitination assay, lysophagic flux measurement with loss-of-function perturbation\",\n      \"pmids\": [\"40083080\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific ubiquitination sites on TMEM192 not mapped\", \"Relative contributions of FBXO27 vs. FBXO3 pathways in vivo not distinguished\", \"Single study awaiting independent replication\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The physiological function of TMEM192 beyond damage-induced lysophagy remains undefined — its role in unstressed conditions, the significance of its subpopulation-restricted distribution, and whether its dimerization is functionally required are unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No non-redundant basal phenotype identified in knockout animals\", \"Structural basis of TMEM192 interactions not determined\", \"Relationship between TMEM192 subpopulation identity and lysophagy competence unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0, 1, 2, 6, 7, 8, 9]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [1, 2, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 4, 5, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TIG1\", \"FBXO27\", \"FBXO3\", \"TAX1BP1\", \"TBK1\"],\n    \"other_free_text\": []\n  }\n}\n```"}