{"gene":"TMEM79","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2013,"finding":"TMEM79 (mattrin) is a 5-transmembrane protein expressed mainly in the trans-Golgi network of stratum granulosum cells in the epidermis. A nonsense mutation (c.840C>G, p.Y280*) abolishes protein expression and impairs the lamellar granule secretory system, resulting in altered stratum corneum formation and spontaneous dermatitis. Exogenous Tmem79 expression rescued both the matted hair and dermatitis phenotype, confirming causality.","method":"Next-generation DNA sequencing to identify mutation; whole-mount immunostaining of epidermal sheets for localization; transgenic rescue experiment","journal":"The Journal of allergy and clinical immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization experiment, loss-of-function phenotype, and transgenic rescue in two independent papers (PMIDs 24060273 and 24084074)","pmids":["24060273","24084074"],"is_preprint":false},{"year":2013,"finding":"Loss of Tmem79/Matt causes a defective skin barrier and spontaneous dermatitis with systemic sensitization after cutaneous allergen challenge in mice, establishing that Tmem79 is required for normal skin barrier function.","method":"Mouse genetics (congenic single-mutant strain separation), next-generation sequencing, immunological analysis including systemic sensitization assays","journal":"The Journal of allergy and clinical immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated in two independent studies with genetic and immunological readouts","pmids":["24084074","24060273"],"is_preprint":false},{"year":2018,"finding":"Tmem79 is expressed by both keratinocytes and sensory neurons, but loss of keratinocytic Tmem79 alone is sufficient to elicit robust scratching. Tmem79 mutant mice show dermal mast cell accumulation that is reduced by cyclooxygenase inhibitors and an EP3 receptor antagonist, and mast cell degranulation drives histaminergic itch via H1R/H4R in a TRPV1-dependent manner. TMEM79 has limited sequence homology to microsomal glutathione transferases and confers protection from accumulation of reactive species.","method":"Tissue-specific knockout (keratinocyte-specific loss), pharmacological inhibition (COX inhibitors, EP3 antagonist), behavioral itch assays, mast cell quantification","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with defined cellular and behavioral phenotype, multiple orthogonal pharmacological interventions in a single rigorous study","pmids":["30463955"],"is_preprint":false},{"year":2020,"finding":"TMEM79/MATTRIN specifically inhibits Wnt/Frizzled (FZD) signaling by interacting with FZD during biogenesis and promoting FZD degradation independently of ZNRF3/RNF43 ubiquitin ligases. TMEM79 interacts with ubiquitin-specific protease 8 (USP8) and specifically inhibits USP8-mediated deubiquitination of FZD, thereby governing USP8 substrate specificity and promoting FZD degradation.","method":"CRISPR/Cas9 genome-wide screen in human cells; co-immunoprecipitation of TMEM79 with FZD and USP8; Wnt signaling reporter assays; deubiquitination assays; Xenopus embryo loss-of-function experiments","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — genome-wide CRISPR screen, reciprocal Co-IP, in vitro deubiquitination assay, and in vivo Xenopus rescue, multiple orthogonal methods in a single rigorous study","pmids":["32924931"],"is_preprint":false},{"year":2020,"finding":"Tmem79 and Usp8 genes have a pre-bilaterian origin, and Tmem79 inhibition of Usp8 and Wnt signaling is required for anterior neural development and gastrulation in Xenopus embryos, establishing an in vivo developmental role for TMEM79 in Wnt pathway regulation.","method":"Xenopus embryo loss-of-function (morpholino knockdown/CRISPR), rescue experiments, developmental phenotyping","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with defined developmental phenotype and rescue, multiple orthogonal methods","pmids":["32924931"],"is_preprint":false},{"year":2020,"finding":"Loss of Tmem79/Mattrin expression in mice leads to IL-17A-dependent spontaneous atopic dermatitis-like skin inflammation with secondary progression to lung inflammation, mediated by cutaneous expansion of Th17 and TCRγδ T cells. Crossing to IL-17A-deficient mice abolished skin and lung disease.","method":"Genetic epistasis (Tmem79ma/ma × IL-17A knockout double mutant mice), flow cytometry, histology, airway inflammation assays","journal":"Allergy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via double-mutant cross with clear phenotypic rescue, multiple immunological readouts","pmids":["32644214"],"is_preprint":false},{"year":2023,"finding":"TMEM79 acts as a negative regulator of TRPV3 ion channel activity. Heterologous expression of TMEM79 suppressed TRPV3-mediated currents in HEK293T cells. TMEM79 modulated TRPV3 translocalization and promoted its lysosomal degradation. Loss of TMEM79 in primary mouse keratinocytes potentiated TRPV3-mediated currents and Ca2+ influx, and Tmem79-deficient male mice preferred higher temperatures due to elevated TRPV3 function.","method":"Heterologous expression in HEK293T cells with electrophysiology; primary keratinocyte calcium imaging; lysosomal degradation assay; temperature preference behavioral assay in Tmem79 knockout mice","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro electrophysiology, calcium imaging, degradation assay, and in vivo behavioral phenotype in KO mice, multiple orthogonal methods","pmids":["37474531"],"is_preprint":false},{"year":2022,"finding":"Tmem79-deficient mice develop spontaneous dermatitis in a biphasic pattern. First-phase dermatitis is microbiota-independent and associated with sebaceous gland hyperplasia and aberrant production of sebaceous long-chain fatty acids (including elongated C20-24 saturated and C18-24 monounsaturated fatty acids); second-phase dermatitis is microbiota-dependent and involves Th17-based immune responses.","method":"Germ-free and specific pathogen-free mouse comparison; RNA sequencing; quantitative RT-PCR; thin-layer chromatography; gas chromatography-tandem mass spectrometry; histological analysis","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple analytical methods in single lab, no independent replication yet","pmids":["35752300"],"is_preprint":false},{"year":2024,"finding":"TMEM79 overexpression mitigates cerebral ischemia/reperfusion injury in mice and OGD/R-treated BV2 cells by activating Nrf2 and inhibiting NLRP3 and caspase-1 expression, thereby reducing inflammation and oxidative stress. Rescue experiments with Nrf2/NLRP3 pathway modulation confirmed pathway dependence.","method":"MCAO/R mouse model with lentiviral TMEM79 overexpression; OGD/R BV2 cell model; DHE staining; TUNEL; ELISA; Western blotting for Nrf2, NLRP3, caspase-1; pathway rescue experiments","journal":"Immunological investigations","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — pathway rescue experiments provide mechanistic placement, but single lab, no independent replication","pmids":["38809063"],"is_preprint":false}],"current_model":"TMEM79 (mattrin) is a multi-span transmembrane protein localized to the trans-Golgi network in epidermal keratinocytes where it supports lamellar granule secretion and skin barrier integrity; it acts as a specific inhibitor of Wnt/Frizzled signaling by binding FZD during biogenesis and promoting its lysosomal degradation through selective inhibition of the deubiquitinase USP8; it additionally functions as a negative regulator of the TRPV3 ion channel by promoting its lysosomal degradation, thereby dampening thermosensory responses; and loss of TMEM79 leads to IL-17A/Th17-dependent skin and lung inflammation, dermal mast cell accumulation driving histaminergic itch via PGE2/H1R/H4R signaling, and aberrant sebaceous lipid production."},"narrative":{"mechanistic_narrative":"TMEM79 (mattrin) is a multi-span transmembrane protein of the trans-Golgi network in epidermal stratum granulosum keratinocytes that maintains skin barrier integrity by supporting the lamellar granule secretory system [PMID:24060273, PMID:24084074]. Loss of TMEM79 produces a defective barrier and spontaneous, allergen-sensitizing dermatitis [PMID:24060273, PMID:24084074], which progresses through IL-17A/Th17- and TCRγδ-dependent skin and lung inflammation [PMID:32644214] and a biphasic course in which an early microbiota-independent phase features sebaceous gland hyperplasia and aberrant long-chain fatty acid production [PMID:35752300]. Beyond barrier maintenance, TMEM79 acts as a degradative regulator of membrane proteins: it binds Frizzled during biogenesis and promotes its lysosomal degradation independently of ZNRF3/RNF43, doing so by interacting with the deubiquitinase USP8 and selectively blocking USP8-mediated deubiquitination of FZD, thereby inhibiting Wnt/Frizzled signaling — a function required in vivo for anterior neural development and gastrulation [PMID:32924931]. By an analogous degradative mechanism it negatively regulates the TRPV3 ion channel, altering its trafficking and promoting its lysosomal degradation to dampen thermosensory responses [PMID:37474531]. In the skin, TMEM79 loss also drives dermal mast cell accumulation and histaminergic itch via COX/EP3 and H1R/H4R signaling in a TRPV1-dependent manner [PMID:30463955].","teleology":[{"year":2013,"claim":"Established that TMEM79 is a trans-Golgi keratinocyte protein causally required for skin barrier formation, answering whether a single gene defect could underlie spontaneous barrier-defective dermatitis.","evidence":"Mutation identification by next-generation sequencing, whole-mount epidermal immunostaining, and transgenic rescue in mice","pmids":["24060273","24084074"],"confidence":"High","gaps":["Molecular mechanism by which TMEM79 supports lamellar granule secretion not defined","No biochemical activity assigned to the protein at this stage"]},{"year":2013,"claim":"Showed that barrier loss leads to systemic allergen sensitization, framing TMEM79 deficiency as a model linking epidermal barrier failure to allergic disease.","evidence":"Congenic single-mutant mouse genetics with immunological sensitization assays","pmids":["24084074","24060273"],"confidence":"High","gaps":["Downstream immune effectors not yet identified","Relative contribution of barrier defect vs intrinsic immune signaling unresolved"]},{"year":2018,"claim":"Localized the disease-driving function to keratinocytes and defined the itch circuit, addressing which cell type and mediators translate barrier loss into scratching behavior.","evidence":"Keratinocyte-specific knockout, COX/EP3 pharmacology, mast cell quantification, and behavioral itch assays","pmids":["30463955"],"confidence":"High","gaps":["Mechanism linking TMEM79 loss to mast cell accumulation not defined","Proposed microsomal glutathione transferase-like protective activity not biochemically validated"]},{"year":2020,"claim":"Defined a molecular biochemical activity for TMEM79 as a selective inhibitor of USP8-mediated FZD deubiquitination that drives Frizzled degradation and dampens Wnt signaling, moving beyond a purely structural/barrier role.","evidence":"Genome-wide CRISPR screen, reciprocal Co-IP of TMEM79 with FZD and USP8, deubiquitination and Wnt reporter assays, and Xenopus loss-of-function","pmids":["32924931"],"confidence":"High","gaps":["Structural basis of TMEM79–USP8 substrate-specificity control unknown","Whether this Wnt-regulatory activity operates in epidermal barrier biology not tested"]},{"year":2020,"claim":"Demonstrated an in vivo developmental requirement for TMEM79-mediated Wnt/USP8 regulation, establishing the pathway as ancient and functionally consequential during embryogenesis.","evidence":"Xenopus embryo morpholino/CRISPR loss-of-function with rescue and developmental phenotyping","pmids":["32924931"],"confidence":"High","gaps":["Mammalian developmental requirement for this function not addressed","Connection to the epidermal phenotype not established"]},{"year":2020,"claim":"Placed IL-17A at the center of TMEM79-loss inflammation, identifying the effector axis driving progression from skin to lung disease.","evidence":"Genetic epistasis via Tmem79 × IL-17A double-mutant cross with flow cytometry, histology, and airway assays","pmids":["32644214"],"confidence":"High","gaps":["Trigger initiating Th17/TCRγδ expansion not defined","Mechanism of skin-to-lung progression unresolved"]},{"year":2022,"claim":"Resolved the dermatitis into microbiota-independent and microbiota-dependent phases and linked the early phase to sebaceous lipid dysregulation, clarifying the temporal sequence of disease.","evidence":"Germ-free vs SPF mouse comparison, RNA-seq, thin-layer and gas chromatography-mass spectrometry, and histology","pmids":["35752300"],"confidence":"Medium","gaps":["No independent replication of the lipid phenotype","Mechanistic link between TMEM79 loss and sebaceous fatty acid alteration unknown"]},{"year":2023,"claim":"Extended the degradative regulatory mechanism to the TRPV3 ion channel, showing TMEM79 controls channel trafficking and lysosomal turnover to set thermosensory thresholds.","evidence":"Heterologous electrophysiology in HEK293T, primary keratinocyte calcium imaging, lysosomal degradation assay, and temperature-preference behavior in KO mice","pmids":["37474531"],"confidence":"High","gaps":["Whether TRPV3 regulation shares the USP8-dependent mechanism used for FZD not determined","Direct physical interaction interface with TRPV3 not mapped"]},{"year":2024,"claim":"Reported a context outside skin in which TMEM79 overexpression is protective via Nrf2 activation and NLRP3/caspase-1 suppression, raising a possible cytoprotective/anti-inflammatory role.","evidence":"MCAO/R mouse model and OGD/R BV2 cells with lentiviral overexpression and Nrf2/NLRP3 pathway rescue","pmids":["38809063"],"confidence":"Medium","gaps":["Single lab, no independent replication","Mechanistic link between TMEM79 and Nrf2 activation not defined","Whether the effect reflects a direct molecular function or indirect consequence is unclear"]},{"year":null,"claim":"Whether the shared degradative logic of TMEM79 (FZD via USP8, and TRPV3) reflects a single unifying biochemical mechanism, and how this connects to its trans-Golgi barrier function, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of TMEM79 or its substrate-binding mode","Unclear whether USP8 inhibition underlies TRPV3 and lipid phenotypes","Mechanistic basis of lamellar granule secretory defect unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,6]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4]}],"complexes":[],"partners":["FZD","USP8","TRPV3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BSE2","full_name":"Transmembrane protein 79","aliases":["Mattrin"],"length_aa":394,"mass_kda":43.5,"function":"Contributes to the epidermal integrity and skin barrier function. Plays a role in the lamellar granule (LG) secretory system and in the stratum corneum (SC) epithelial cell formation (By similarity)","subcellular_location":"Lysosome; Golgi apparatus, trans-Golgi network; Membrane","url":"https://www.uniprot.org/uniprotkb/Q9BSE2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TMEM79","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/TMEM79","total_profiled":1310},"omim":[{"mim_id":"615531","title":"TRANSMEMBRANE PROTEIN 79; TMEM79","url":"https://www.omim.org/entry/615531"},{"mim_id":"610962","title":"SMG5 NONSENSE-MEDIATED mRNA DECAY FACTOR; SMG5","url":"https://www.omim.org/entry/610962"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoli fibrillar center","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":136.8},{"tissue":"skin 1","ntpm":88.6},{"tissue":"vagina","ntpm":59.1}],"url":"https://www.proteinatlas.org/search/TMEM79"},"hgnc":{"alias_symbol":["MGC13102","FLJ16057","FLJ32254","MATT"],"prev_symbol":[]},"alphafold":{"accession":"Q9BSE2","domains":[{"cath_id":"1.20.120.550","chopping":"193-375","consensus_level":"high","plddt":80.3614,"start":193,"end":375}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BSE2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BSE2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BSE2-F1-predicted_aligned_error_v6.png","plddt_mean":61.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TMEM79","jax_strain_url":"https://www.jax.org/strain/search?query=TMEM79"},"sequence":{"accession":"Q9BSE2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BSE2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BSE2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BSE2"}},"corpus_meta":[{"pmid":"18193941","id":"PMC_18193941","title":"Matt: local flexibility aids protein multiple structure alignment.","date":"2008","source":"PLoS computational biology","url":"https://pubmed.ncbi.nlm.nih.gov/18193941","citation_count":139,"is_preprint":false},{"pmid":"24084074","id":"PMC_24084074","title":"Tmem79/Matt is the matted mouse gene and is a predisposing gene for atopic dermatitis in human subjects.","date":"2013","source":"The Journal of allergy and clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/24084074","citation_count":126,"is_preprint":false},{"pmid":"24060273","id":"PMC_24060273","title":"A homozygous nonsense mutation in the gene for Tmem79, a component for the lamellar granule secretory system, produces spontaneous eczema in an experimental model of atopic dermatitis.","date":"2013","source":"The Journal of allergy and clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/24060273","citation_count":103,"is_preprint":false},{"pmid":"11158370","id":"PMC_11158370","title":"Three divergent rDNA clusters predate the species divergence in Quercus petraea (Matt.) 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L. revealed at the stage of naturally established seedling.","date":"2010","source":"Molecular ecology","url":"https://pubmed.ncbi.nlm.nih.gov/20550635","citation_count":26,"is_preprint":false},{"pmid":"26237329","id":"PMC_26237329","title":"Analysis of the Human Prostate-Specific Proteome Defined by Transcriptomics and Antibody-Based Profiling Identifies TMEM79 and ACOXL as Two Putative, Diagnostic Markers in Prostate Cancer.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26237329","citation_count":24,"is_preprint":false},{"pmid":"37474531","id":"PMC_37474531","title":"Involvement of skin TRPV3 in temperature detection regulated by TMEM79 in mice.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37474531","citation_count":23,"is_preprint":false},{"pmid":"30141159","id":"PMC_30141159","title":"Comparison of virulence between matt and mucoid colonies of Klebsiella pneumoniae coproducing NDM-1 and OXA-232 isolated from a single patient.","date":"2018","source":"Journal of microbiology (Seoul, Korea)","url":"https://pubmed.ncbi.nlm.nih.gov/30141159","citation_count":22,"is_preprint":false},{"pmid":"19689784","id":"PMC_19689784","title":"Natural hybridisation between Quercus petraea (Matt.) Liebl. and Quercus pubescens Willd. within an Italian stand as revealed by microsatellite fingerprinting.","date":"2009","source":"Plant biology (Stuttgart, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/19689784","citation_count":22,"is_preprint":false},{"pmid":"32644214","id":"PMC_32644214","title":"Dysregulated skin barrier function in Tmem79 mutant mice promotes IL-17A-dependent spontaneous skin and lung inflammation.","date":"2020","source":"Allergy","url":"https://pubmed.ncbi.nlm.nih.gov/32644214","citation_count":18,"is_preprint":false},{"pmid":"32924931","id":"PMC_32924931","title":"TMEM79/MATTRIN defines a pathway for Frizzled regulation and is required for Xenopus embryogenesis.","date":"2020","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/32924931","citation_count":17,"is_preprint":false},{"pmid":"19052776","id":"PMC_19052776","title":"Nucleotide sequence, structural organization and length heterogeneity of ribosomal DNA intergenic spacer in Quercus petraea (Matt.) 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Liebl.) high- and low-water use efficiency genotypes.","date":"2022","source":"Tree physiology","url":"https://pubmed.ncbi.nlm.nih.gov/35867420","citation_count":4,"is_preprint":false},{"pmid":"38809063","id":"PMC_38809063","title":"TMEM79 Ameliorates Cerebral Ischemia/Reperfusion Injury Through Regulating Inflammation and Oxidative Stress via the Nrf2/NLRP3 Pathway.","date":"2024","source":"Immunological investigations","url":"https://pubmed.ncbi.nlm.nih.gov/38809063","citation_count":3,"is_preprint":false},{"pmid":"34188852","id":"PMC_34188852","title":"Small-scale genetic structure and mating patterns in an extensive sessile oak forest (Quercus petraea (Matt.) Liebl.).","date":"2021","source":"Ecology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/34188852","citation_count":3,"is_preprint":false},{"pmid":"38610046","id":"PMC_38610046","title":"Cryopreservation of sessile oak (Quercus petraea (Matt.) Liebl.) plumules using aluminium cryo-plates: influence of cryoprotection and drying.","date":"2024","source":"Plant methods","url":"https://pubmed.ncbi.nlm.nih.gov/38610046","citation_count":3,"is_preprint":false},{"pmid":"37316726","id":"PMC_37316726","title":"Key triggers of adaptive genetic variability of sessile oak [Q. petraea (Matt.) Liebl.] from the Balkan refugia: outlier detection and association of SNP loci from ddRAD-seq data.","date":"2023","source":"Heredity","url":"https://pubmed.ncbi.nlm.nih.gov/37316726","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":12977,"output_tokens":2577,"usd":0.038793,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9809,"output_tokens":3296,"usd":0.065723,"stage2_stop_reason":"end_turn"},"total_usd":0.104516,"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\": 2013,\n      \"finding\": \"TMEM79 (mattrin) is a 5-transmembrane protein expressed mainly in the trans-Golgi network of stratum granulosum cells in the epidermis. A nonsense mutation (c.840C>G, p.Y280*) abolishes protein expression and impairs the lamellar granule secretory system, resulting in altered stratum corneum formation and spontaneous dermatitis. Exogenous Tmem79 expression rescued both the matted hair and dermatitis phenotype, confirming causality.\",\n      \"method\": \"Next-generation DNA sequencing to identify mutation; whole-mount immunostaining of epidermal sheets for localization; transgenic rescue experiment\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiment, loss-of-function phenotype, and transgenic rescue in two independent papers (PMIDs 24060273 and 24084074)\",\n      \"pmids\": [\"24060273\", \"24084074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of Tmem79/Matt causes a defective skin barrier and spontaneous dermatitis with systemic sensitization after cutaneous allergen challenge in mice, establishing that Tmem79 is required for normal skin barrier function.\",\n      \"method\": \"Mouse genetics (congenic single-mutant strain separation), next-generation sequencing, immunological analysis including systemic sensitization assays\",\n      \"journal\": \"The Journal of allergy and clinical immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated in two independent studies with genetic and immunological readouts\",\n      \"pmids\": [\"24084074\", \"24060273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tmem79 is expressed by both keratinocytes and sensory neurons, but loss of keratinocytic Tmem79 alone is sufficient to elicit robust scratching. Tmem79 mutant mice show dermal mast cell accumulation that is reduced by cyclooxygenase inhibitors and an EP3 receptor antagonist, and mast cell degranulation drives histaminergic itch via H1R/H4R in a TRPV1-dependent manner. TMEM79 has limited sequence homology to microsomal glutathione transferases and confers protection from accumulation of reactive species.\",\n      \"method\": \"Tissue-specific knockout (keratinocyte-specific loss), pharmacological inhibition (COX inhibitors, EP3 antagonist), behavioral itch assays, mast cell quantification\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with defined cellular and behavioral phenotype, multiple orthogonal pharmacological interventions in a single rigorous study\",\n      \"pmids\": [\"30463955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TMEM79/MATTRIN specifically inhibits Wnt/Frizzled (FZD) signaling by interacting with FZD during biogenesis and promoting FZD degradation independently of ZNRF3/RNF43 ubiquitin ligases. TMEM79 interacts with ubiquitin-specific protease 8 (USP8) and specifically inhibits USP8-mediated deubiquitination of FZD, thereby governing USP8 substrate specificity and promoting FZD degradation.\",\n      \"method\": \"CRISPR/Cas9 genome-wide screen in human cells; co-immunoprecipitation of TMEM79 with FZD and USP8; Wnt signaling reporter assays; deubiquitination assays; Xenopus embryo loss-of-function experiments\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — genome-wide CRISPR screen, reciprocal Co-IP, in vitro deubiquitination assay, and in vivo Xenopus rescue, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"32924931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Tmem79 and Usp8 genes have a pre-bilaterian origin, and Tmem79 inhibition of Usp8 and Wnt signaling is required for anterior neural development and gastrulation in Xenopus embryos, establishing an in vivo developmental role for TMEM79 in Wnt pathway regulation.\",\n      \"method\": \"Xenopus embryo loss-of-function (morpholino knockdown/CRISPR), rescue experiments, developmental phenotyping\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with defined developmental phenotype and rescue, multiple orthogonal methods\",\n      \"pmids\": [\"32924931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of Tmem79/Mattrin expression in mice leads to IL-17A-dependent spontaneous atopic dermatitis-like skin inflammation with secondary progression to lung inflammation, mediated by cutaneous expansion of Th17 and TCRγδ T cells. Crossing to IL-17A-deficient mice abolished skin and lung disease.\",\n      \"method\": \"Genetic epistasis (Tmem79ma/ma × IL-17A knockout double mutant mice), flow cytometry, histology, airway inflammation assays\",\n      \"journal\": \"Allergy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via double-mutant cross with clear phenotypic rescue, multiple immunological readouts\",\n      \"pmids\": [\"32644214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TMEM79 acts as a negative regulator of TRPV3 ion channel activity. Heterologous expression of TMEM79 suppressed TRPV3-mediated currents in HEK293T cells. TMEM79 modulated TRPV3 translocalization and promoted its lysosomal degradation. Loss of TMEM79 in primary mouse keratinocytes potentiated TRPV3-mediated currents and Ca2+ influx, and Tmem79-deficient male mice preferred higher temperatures due to elevated TRPV3 function.\",\n      \"method\": \"Heterologous expression in HEK293T cells with electrophysiology; primary keratinocyte calcium imaging; lysosomal degradation assay; temperature preference behavioral assay in Tmem79 knockout mice\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro electrophysiology, calcium imaging, degradation assay, and in vivo behavioral phenotype in KO mice, multiple orthogonal methods\",\n      \"pmids\": [\"37474531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tmem79-deficient mice develop spontaneous dermatitis in a biphasic pattern. First-phase dermatitis is microbiota-independent and associated with sebaceous gland hyperplasia and aberrant production of sebaceous long-chain fatty acids (including elongated C20-24 saturated and C18-24 monounsaturated fatty acids); second-phase dermatitis is microbiota-dependent and involves Th17-based immune responses.\",\n      \"method\": \"Germ-free and specific pathogen-free mouse comparison; RNA sequencing; quantitative RT-PCR; thin-layer chromatography; gas chromatography-tandem mass spectrometry; histological analysis\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple analytical methods in single lab, no independent replication yet\",\n      \"pmids\": [\"35752300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TMEM79 overexpression mitigates cerebral ischemia/reperfusion injury in mice and OGD/R-treated BV2 cells by activating Nrf2 and inhibiting NLRP3 and caspase-1 expression, thereby reducing inflammation and oxidative stress. Rescue experiments with Nrf2/NLRP3 pathway modulation confirmed pathway dependence.\",\n      \"method\": \"MCAO/R mouse model with lentiviral TMEM79 overexpression; OGD/R BV2 cell model; DHE staining; TUNEL; ELISA; Western blotting for Nrf2, NLRP3, caspase-1; pathway rescue experiments\",\n      \"journal\": \"Immunological investigations\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — pathway rescue experiments provide mechanistic placement, but single lab, no independent replication\",\n      \"pmids\": [\"38809063\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TMEM79 (mattrin) is a multi-span transmembrane protein localized to the trans-Golgi network in epidermal keratinocytes where it supports lamellar granule secretion and skin barrier integrity; it acts as a specific inhibitor of Wnt/Frizzled signaling by binding FZD during biogenesis and promoting its lysosomal degradation through selective inhibition of the deubiquitinase USP8; it additionally functions as a negative regulator of the TRPV3 ion channel by promoting its lysosomal degradation, thereby dampening thermosensory responses; and loss of TMEM79 leads to IL-17A/Th17-dependent skin and lung inflammation, dermal mast cell accumulation driving histaminergic itch via PGE2/H1R/H4R signaling, and aberrant sebaceous lipid production.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TMEM79 (mattrin) is a multi-span transmembrane protein of the trans-Golgi network in epidermal stratum granulosum keratinocytes that maintains skin barrier integrity by supporting the lamellar granule secretory system [#0]. Loss of TMEM79 produces a defective barrier and spontaneous, allergen-sensitizing dermatitis [#0, #1], which progresses through IL-17A/Th17- and TCRγδ-dependent skin and lung inflammation [#5] and a biphasic course in which an early microbiota-independent phase features sebaceous gland hyperplasia and aberrant long-chain fatty acid production [#7]. Beyond barrier maintenance, TMEM79 acts as a degradative regulator of membrane proteins: it binds Frizzled during biogenesis and promotes its lysosomal degradation independently of ZNRF3/RNF43, doing so by interacting with the deubiquitinase USP8 and selectively blocking USP8-mediated deubiquitination of FZD, thereby inhibiting Wnt/Frizzled signaling — a function required in vivo for anterior neural development and gastrulation [#3, #4]. By an analogous degradative mechanism it negatively regulates the TRPV3 ion channel, altering its trafficking and promoting its lysosomal degradation to dampen thermosensory responses [#6]. In the skin, TMEM79 loss also drives dermal mast cell accumulation and histaminergic itch via COX/EP3 and H1R/H4R signaling in a TRPV1-dependent manner [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that TMEM79 is a trans-Golgi keratinocyte protein causally required for skin barrier formation, answering whether a single gene defect could underlie spontaneous barrier-defective dermatitis.\",\n      \"evidence\": \"Mutation identification by next-generation sequencing, whole-mount epidermal immunostaining, and transgenic rescue in mice\",\n      \"pmids\": [\n        \"24060273\",\n        \"24084074\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism by which TMEM79 supports lamellar granule secretion not defined\",\n        \"No biochemical activity assigned to the protein at this stage\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed that barrier loss leads to systemic allergen sensitization, framing TMEM79 deficiency as a model linking epidermal barrier failure to allergic disease.\",\n      \"evidence\": \"Congenic single-mutant mouse genetics with immunological sensitization assays\",\n      \"pmids\": [\n        \"24084074\",\n        \"24060273\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Downstream immune effectors not yet identified\",\n        \"Relative contribution of barrier defect vs intrinsic immune signaling unresolved\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Localized the disease-driving function to keratinocytes and defined the itch circuit, addressing which cell type and mediators translate barrier loss into scratching behavior.\",\n      \"evidence\": \"Keratinocyte-specific knockout, COX/EP3 pharmacology, mast cell quantification, and behavioral itch assays\",\n      \"pmids\": [\n        \"30463955\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism linking TMEM79 loss to mast cell accumulation not defined\",\n        \"Proposed microsomal glutathione transferase-like protective activity not biochemically validated\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a molecular biochemical activity for TMEM79 as a selective inhibitor of USP8-mediated FZD deubiquitination that drives Frizzled degradation and dampens Wnt signaling, moving beyond a purely structural/barrier role.\",\n      \"evidence\": \"Genome-wide CRISPR screen, reciprocal Co-IP of TMEM79 with FZD and USP8, deubiquitination and Wnt reporter assays, and Xenopus loss-of-function\",\n      \"pmids\": [\n        \"32924931\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of TMEM79–USP8 substrate-specificity control unknown\",\n        \"Whether this Wnt-regulatory activity operates in epidermal barrier biology not tested\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated an in vivo developmental requirement for TMEM79-mediated Wnt/USP8 regulation, establishing the pathway as ancient and functionally consequential during embryogenesis.\",\n      \"evidence\": \"Xenopus embryo morpholino/CRISPR loss-of-function with rescue and developmental phenotyping\",\n      \"pmids\": [\n        \"32924931\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mammalian developmental requirement for this function not addressed\",\n        \"Connection to the epidermal phenotype not established\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed IL-17A at the center of TMEM79-loss inflammation, identifying the effector axis driving progression from skin to lung disease.\",\n      \"evidence\": \"Genetic epistasis via Tmem79 × IL-17A double-mutant cross with flow cytometry, histology, and airway assays\",\n      \"pmids\": [\n        \"32644214\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Trigger initiating Th17/TCRγδ expansion not defined\",\n        \"Mechanism of skin-to-lung progression unresolved\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved the dermatitis into microbiota-independent and microbiota-dependent phases and linked the early phase to sebaceous lipid dysregulation, clarifying the temporal sequence of disease.\",\n      \"evidence\": \"Germ-free vs SPF mouse comparison, RNA-seq, thin-layer and gas chromatography-mass spectrometry, and histology\",\n      \"pmids\": [\n        \"35752300\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No independent replication of the lipid phenotype\",\n        \"Mechanistic link between TMEM79 loss and sebaceous fatty acid alteration unknown\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended the degradative regulatory mechanism to the TRPV3 ion channel, showing TMEM79 controls channel trafficking and lysosomal turnover to set thermosensory thresholds.\",\n      \"evidence\": \"Heterologous electrophysiology in HEK293T, primary keratinocyte calcium imaging, lysosomal degradation assay, and temperature-preference behavior in KO mice\",\n      \"pmids\": [\n        \"37474531\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TRPV3 regulation shares the USP8-dependent mechanism used for FZD not determined\",\n        \"Direct physical interaction interface with TRPV3 not mapped\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Reported a context outside skin in which TMEM79 overexpression is protective via Nrf2 activation and NLRP3/caspase-1 suppression, raising a possible cytoprotective/anti-inflammatory role.\",\n      \"evidence\": \"MCAO/R mouse model and OGD/R BV2 cells with lentiviral overexpression and Nrf2/NLRP3 pathway rescue\",\n      \"pmids\": [\n        \"38809063\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab, no independent replication\",\n        \"Mechanistic link between TMEM79 and Nrf2 activation not defined\",\n        \"Whether the effect reflects a direct molecular function or indirect consequence is unclear\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether the shared degradative logic of TMEM79 (FZD via USP8, and TRPV3) reflects a single unifying biochemical mechanism, and how this connects to its trans-Golgi barrier function, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No structural model of TMEM79 or its substrate-binding mode\",\n        \"Unclear whether USP8 inhibition underlies TRPV3 and lipid phenotypes\",\n        \"Mechanistic basis of lamellar granule secretory defect unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"FZD\",\n      \"USP8\",\n      \"TRPV3\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}