Affinage

TMEM79

Transmembrane protein 79 · UniProt Q9BSE2

Length
394 aa
Mass
43.5 kDa
Annotated
2026-06-10
23 papers in source corpus 8 papers cited in narrative 9 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 5/5 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

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).

Mechanistic history

Synthesis pass · year-by-year structured walk · 9 steps
  1. 2013 High

    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

    PMID:24060273 PMID:24084074

    Open questions at the time
    • Molecular mechanism by which TMEM79 supports lamellar granule secretion not defined
    • No biochemical activity assigned to the protein at this stage
  2. 2013 High

    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

    PMID:24060273 PMID:24084074

    Open questions at the time
    • Downstream immune effectors not yet identified
    • Relative contribution of barrier defect vs intrinsic immune signaling unresolved
  3. 2018 High

    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

    PMID:30463955

    Open questions at the time
    • Mechanism linking TMEM79 loss to mast cell accumulation not defined
    • Proposed microsomal glutathione transferase-like protective activity not biochemically validated
  4. 2020 High

    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

    PMID:32924931

    Open questions at the time
    • Structural basis of TMEM79–USP8 substrate-specificity control unknown
    • Whether this Wnt-regulatory activity operates in epidermal barrier biology not tested
  5. 2020 High

    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

    PMID:32924931

    Open questions at the time
    • Mammalian developmental requirement for this function not addressed
    • Connection to the epidermal phenotype not established
  6. 2020 High

    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

    PMID:32644214

    Open questions at the time
    • Trigger initiating Th17/TCRγδ expansion not defined
    • Mechanism of skin-to-lung progression unresolved
  7. 2022 Medium

    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

    PMID:35752300

    Open questions at the time
    • No independent replication of the lipid phenotype
    • Mechanistic link between TMEM79 loss and sebaceous fatty acid alteration unknown
  8. 2023 High

    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

    PMID:37474531

    Open questions at the time
    • Whether TRPV3 regulation shares the USP8-dependent mechanism used for FZD not determined
    • Direct physical interaction interface with TRPV3 not mapped
  9. 2024 Medium

    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

    PMID:38809063

    Open questions at the time
    • 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

Open questions

Synthesis pass · forward-looking unresolved questions
  • 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.
  • 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

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0098772 molecular function regulator activity 2 GO:0140096 catalytic activity, acting on a protein 1
Localization
GO:0005794 Golgi apparatus 1
Pathway
R-HSA-162582 Signal Transduction 2 R-HSA-1266738 Developmental Biology 1 R-HSA-168256 Immune System 1
Partners
FZDTRPV3USP8

Evidence

Reading pass · 9 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2013 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. Next-generation DNA sequencing to identify mutation; whole-mount immunostaining of epidermal sheets for localization; transgenic rescue experiment The Journal of allergy and clinical immunology High 24060273 24084074
2013 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. Mouse genetics (congenic single-mutant strain separation), next-generation sequencing, immunological analysis including systemic sensitization assays The Journal of allergy and clinical immunology High 24060273 24084074
2018 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. Tissue-specific knockout (keratinocyte-specific loss), pharmacological inhibition (COX inhibitors, EP3 antagonist), behavioral itch assays, mast cell quantification Proceedings of the National Academy of Sciences of the United States of America High 30463955
2020 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. 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 eLife High 32924931
2020 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. Xenopus embryo loss-of-function (morpholino knockdown/CRISPR), rescue experiments, developmental phenotyping eLife High 32924931
2020 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. Genetic epistasis (Tmem79ma/ma × IL-17A knockout double mutant mice), flow cytometry, histology, airway inflammation assays Allergy High 32644214
2023 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. Heterologous expression in HEK293T cells with electrophysiology; primary keratinocyte calcium imaging; lysosomal degradation assay; temperature preference behavioral assay in Tmem79 knockout mice Nature communications High 37474531
2022 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. Germ-free and specific pathogen-free mouse comparison; RNA sequencing; quantitative RT-PCR; thin-layer chromatography; gas chromatography-tandem mass spectrometry; histological analysis The Journal of investigative dermatology Medium 35752300
2024 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. 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 Immunological investigations Medium 38809063

Source papers

Stage 0 corpus · 23 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2008 Matt: local flexibility aids protein multiple structure alignment. PLoS computational biology 139 18193941
2013 Tmem79/Matt is the matted mouse gene and is a predisposing gene for atopic dermatitis in human subjects. The Journal of allergy and clinical immunology 126 24084074
2013 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. The Journal of allergy and clinical immunology 103 24060273
2001 Three divergent rDNA clusters predate the species divergence in Quercus petraea (Matt.) Liebl. and Quercus robur L. Molecular biology and evolution 92 11158370
1940 TYPE-SPECIFIC ANTIGENS, M AND T, OF MATT AND GLOSSY VARIANTS OF GROUP A HEMOLYTIC STREPTOCOCCI. The Journal of experimental medicine 81 19870978
2019 Matt: Unix tools for alternative splicing analysis. Bioinformatics (Oxford, England) 57 30010778
2018 Tissue-specific contributions of Tmem79 to atopic dermatitis and mast cell-mediated histaminergic itch. Proceedings of the National Academy of Sciences of the United States of America 36 30463955
2010 Realized gene flow within mixed stands of Quercus robur L. and Q. petraea (Matt.) L. revealed at the stage of naturally established seedling. Molecular ecology 26 20550635
2015 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. PloS one 24 26237329
2023 Involvement of skin TRPV3 in temperature detection regulated by TMEM79 in mice. Nature communications 23 37474531
2018 Comparison of virulence between matt and mucoid colonies of Klebsiella pneumoniae coproducing NDM-1 and OXA-232 isolated from a single patient. Journal of microbiology (Seoul, Korea) 22 30141159
2009 Natural hybridisation between Quercus petraea (Matt.) Liebl. and Quercus pubescens Willd. within an Italian stand as revealed by microsatellite fingerprinting. Plant biology (Stuttgart, Germany) 22 19689784
2020 Dysregulated skin barrier function in Tmem79 mutant mice promotes IL-17A-dependent spontaneous skin and lung inflammation. Allergy 18 32644214
2020 TMEM79/MATTRIN defines a pathway for Frizzled regulation and is required for Xenopus embryogenesis. eLife 17 32924931
2008 Nucleotide sequence, structural organization and length heterogeneity of ribosomal DNA intergenic spacer in Quercus petraea (Matt.) Liebl. and Q. robur L. Molecular genetics and genomics : MGG 12 19052776
2011 Touring protein space with Matt. IEEE/ACM transactions on computational biology and bioinformatics 10 21464511
2011 Characterisation and natural variation of a dehydrin gene in Quercus petraea (Matt.) Liebl. Plant biology (Stuttgart, Germany) 9 21973280
2022 Microbiota-Independent Spontaneous Dermatitis Associated with Increased Sebaceous Lipid Production in Tmem79-Deficient Mice. The Journal of investigative dermatology 6 35752300
2022 Molecular plasticity to soil water deficit differs between sessile oak (Quercus Petraea (Matt.) Liebl.) high- and low-water use efficiency genotypes. Tree physiology 4 35867420
2024 Cryopreservation of sessile oak (Quercus petraea (Matt.) Liebl.) plumules using aluminium cryo-plates: influence of cryoprotection and drying. Plant methods 3 38610046
2024 TMEM79 Ameliorates Cerebral Ischemia/Reperfusion Injury Through Regulating Inflammation and Oxidative Stress via the Nrf2/NLRP3 Pathway. Immunological investigations 3 38809063
2021 Small-scale genetic structure and mating patterns in an extensive sessile oak forest (Quercus petraea (Matt.) Liebl.). Ecology and evolution 3 34188852
2023 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. Heredity 0 37316726

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