{"gene":"TGM1","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":1997,"finding":"Three novel point mutations in the TGM1 (TGK) gene cause lamellar ichthyosis: a promoter Sp1-site mutation that profoundly reduces TGK transcript levels (impairing transcription), and two missense mutations (Gly143Glu, Val382Met) that produce normal transcript levels but lead to absence of detectable TGK protein, suggesting structural instability. All three mutations result in drastically reduced transglutaminase 1 enzymatic activity as measured by in situ activity assay.","method":"Northern blot (transcript quantification), immunofluorescence and immunoblotting (protein detection), transglutaminase activity assay, DNA sequencing of exons and exon-intron borders","journal":"European journal of human genetics : EJHG","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (activity assay, immunoblot, Northern blot, sequencing) in a single lab study directly linking specific mutations to loss of TGase-1 activity and protein stability","pmids":["9359043"],"is_preprint":false},{"year":2001,"finding":"Novel TGM1 mutations in a patient with non-bullous congenital ichthyosiform erythroderma: a frameshift mutation (9008delA) in the beta-barrel 2 domain (C-terminal) and a missense mutation R388H in the core domain. In situ TGase activity assay showed markedly reduced TGase 1 activity in the patient's epidermis. Electron microscopy revealed incomplete thickening of the cornified cell envelope during keratinization, establishing that both the beta-barrel 2 domain and core domain are required for normal TGase-1 function and cornified envelope formation.","method":"In situ TGase activity assay, electron microscopy, DNA sequencing of TGM1 exons and exon-intron borders","journal":"The British journal of dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in situ activity assay combined with electron microscopy and sequencing in a single patient study establishing domain-function relationships","pmids":["11251583"],"is_preprint":false},{"year":2004,"finding":"A distal region of the TGM1 promoter (between -1.6 and -1.4 kb) containing AP1 and Sp1 binding sites is required for tissue-specific and cell-layer-specific expression of TGM1 in transgenic mice and cultured keratinocytes. Mutation of both Sp1 sites and the AP1 site together eliminated nearly all transcriptional activity, while single mutations had only small effects. The same distal region also drives expression in squamous metaplasia under vitamin A deprivation.","method":"Transgenic mouse reporter assay, EMSA (electrophoretic mobility shift assay), promoter deletion and mutation transfection assays in cultured keratinocytes, Western blotting and immunohistochemistry","journal":"BMC dermatology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo transgenic assay plus in vitro mutagenesis and EMSA, multiple orthogonal methods in a single study establishing specific cis-regulatory elements controlling TGM1 expression","pmids":["15061870"],"is_preprint":false},{"year":2005,"finding":"Defective TGM1-encoded transglutaminase 1 activity results in absence or paucity of cornified cell envelopes (CEs) not only in epidermal scale but also in nail and hair cuticle cells. A V518M heterozygous TGM1 mutation combined with an inactive allele confers cross-linking deficiency across multiple keratinizing epithelia. Phase contrast microscopy and electron microscopy confirmed loss of prominent cell borders and marginal bands in hair cuticle cells from TGM1-deficient patients.","method":"SDS/DTT extraction of epidermal scale, nail, and hair; phase contrast microscopy; electron microscopy; clinical genotyping","journal":"Archives of dermatological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct structural assay across multiple tissue types in a defined genotype-phenotype study, single lab with two orthogonal microscopy methods","pmids":["16133457"],"is_preprint":false},{"year":2009,"finding":"Structural modeling of human TGase-1 using 115 TGM1 mutations from 234 ARCI patients revealed that all mutated arginine residues located in the two beta-barrel domains and two (R142, R143) in the beta-sandwich domain reside at domain interfaces, suggesting these positions are critical for maintaining proper domain-domain interactions necessary for TGase-1 structural integrity and function. The c.877-2A>G splice-site mutation accounts for 34% of all TGM1 mutant alleles, with founder effects in North American and Norwegian populations.","method":"Homology structural modeling of TGase-1; mutational analysis across 234 patients; haplotype analysis for founder effect","journal":"Human mutation","confidence":"Low","confidence_rationale":"Tier 4 / Moderate — structural insight is computational modeling only (no experimental structural validation); population data is strong but mechanistic inference is model-based","pmids":["19241467"],"is_preprint":false},{"year":2011,"finding":"Fluorescence-labeled isozyme-specific 12-amino acid substrate peptides enable rapid in situ detection of active TGase 1 (keratinocyte type) and TGase 2 (tissue type) with clearly distinct tissue distribution patterns in whole-body mouse sections. TGase 1 activity is strongly detected in epithelial tissues including tongue, developing teeth, forestomach, and skin epidermis, establishing the spatial pattern of active TGase 1 protein in vivo.","method":"In situ detection using fluorescence-labeled isozyme-specific substrate peptides; whole-body section analysis","journal":"The journal of histochemistry and cytochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional assay using isozyme-specific substrates validated across multiple tissues, single lab study with clear mechanistic specificity for TGase 1 activity localization","pmids":["20876521"],"is_preprint":false},{"year":2012,"finding":"Specific TGM1 missense mutations affecting arginine at positions 307 or 315 are associated with temperature-sensitive phenotypes (bathing suit ichthyosis and self-improving collodion ichthyosis), suggesting that these arginine residues are critical for temperature-dependent TGase-1 activity, with the protein retaining partial function at cooler body surface temperatures but losing function at warmer core body temperature sites.","method":"Genotype-phenotype correlation in 9 patients; clinical phenotypic assessment; DNA sequencing identifying missense mutations","journal":"Archives of dermatology","confidence":"Low","confidence_rationale":"Tier 3 / Moderate — genotype-phenotype correlation across multiple patients supports temperature-sensitive function of specific residues, but mechanistic inference is indirect; no direct biochemical assay of temperature sensitivity performed","pmids":["22801880"],"is_preprint":false},{"year":2019,"finding":"The palmitoyl-acyl transferase ZDHHC13 palmitoylates TGM1 (transglutaminase 1), and this palmitoylation is critical for in vivo protein stability of TGase-1. Quantitative proteomic approaches identified TGM1 as a ZDHHC13 substrate, and biochemical assay confirmed palmitoylation. Loss of ZDHHC13 enzymatic activity (knock-in DQ-to-AA mutation) led to skin barrier defects and loss of TGase-1 stability, establishing palmitoylation as a post-translational modification required for TGase-1 function in skin barrier development.","method":"Quantitative proteomics to identify palmitoylation substrates; biochemical palmitoylation assay confirmation; knock-in mouse model with enzymatically dead ZDHHC13; protein stability assessment","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical assay confirming palmitoylation combined with in vivo knock-in model demonstrating loss of TGM1 protein stability, multiple orthogonal methods establishing ZDHHC13 as the writer for TGM1 palmitoylation","pmids":["31669413"],"is_preprint":false},{"year":2021,"finding":"The pathogenic TGM1 mutation c.607C>T can be corrected in mutant zygotes by adenine base editing (ABE). Using ABEmax-NG with 20-bp sgRNA achieved 73.8% editing efficiency, and Sc-ABEmax with 19-bp sgRNA achieved 78.7% efficiency. Whole-genome sequencing confirmed precise DNA editing without detected off-target effects, establishing proof-of-concept for base-editing correction of TGM1 mutations.","method":"Adenine base editing (ABEmax-NG, Sc-ABEmax) in zygotes; whole-genome sequencing; deep sequencing for off-target analysis","journal":"Molecular therapy : the journal of the American Society of Gene Therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gene correction demonstrated with two ABE systems and genomic sequencing validation, single lab study establishing technical feasibility","pmids":["33974999"],"is_preprint":false},{"year":2011,"finding":"Abnormal expression of TGk (TGM1/transglutaminase 1) is detected in chloracne skin lesions from dioxin-exposed patients: TGk mRNA and protein positive signals, normally restricted to the stratum granulosum, were found more significantly distributed in both the stratum granulosum and stratum spinosum in chloracne tissues, suggesting dioxin exposure expands the epidermal layer expressing TGase-1.","method":"Fluorescence in situ hybridization (FISH) for mRNA; immunohistochemistry for protein; comparison with healthy controls","journal":"Toxicology letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single IHC/FISH comparison study showing altered localization pattern; no functional or mechanistic follow-up; single lab, descriptive","pmids":["21237254"],"is_preprint":false}],"current_model":"TGM1 encodes transglutaminase 1 (TGase-1/TGK), a calcium-dependent enzyme expressed in the suprabasal/granular layers of stratified squamous epithelia that crosslinks glutamine and lysine residues in structural proteins to form the cornified cell envelope; its expression is driven by a distal promoter region containing cooperative AP1 and Sp1 sites, its protein stability depends on palmitoylation by ZDHHC13, loss-of-function mutations (particularly in the core domain, beta-barrel domains, and key arginine residues at domain interfaces) abolish enzymatic activity and cornified envelope formation causing autosomal recessive congenital ichthyosis, and specific temperature-sensitive mutations at R307/R315 produce restricted or self-resolving disease phenotypes consistent with partial activity at cooler skin temperatures."},"narrative":{"mechanistic_narrative":"TGM1 encodes transglutaminase 1, a calcium-dependent crosslinking enzyme whose activity is concentrated in the differentiating layers of stratified squamous epithelia, where it forms the cornified cell envelope essential for skin barrier function [PMID:20876521]. Loss of TGase-1 activity through point, frameshift, and splice mutations abolishes or markedly reduces enzymatic crosslinking and produces absent or incomplete cornified envelopes not only in epidermis but also in nail and hair cuticle cells, causing autosomal recessive congenital ichthyosis [PMID:9359043, PMID:11251583, PMID:16133457]. Mutations cluster in functionally critical regions—the core domain, the beta-barrel 2 domain, and arginine residues positioned at domain interfaces—where they compromise structural integrity and catalytic function [PMID:11251583, PMID:19241467], and missense changes at R307/R315 confer temperature-sensitive phenotypes consistent with residual activity at cooler skin surface temperatures [PMID:22801880]. Cell-layer- and tissue-specific expression of TGM1 is governed by a distal promoter region containing cooperative AP1 and Sp1 binding sites, whose combined mutation eliminates nearly all transcriptional activity [PMID:15061870]. Post-translationally, TGase-1 is palmitoylated by the acyltransferase ZDHHC13, a modification required for its protein stability and for normal skin barrier development [PMID:31669413]. Pathogenic TGM1 alleles are correctable by adenine base editing as a proof-of-concept therapeutic strategy [PMID:33974999].","teleology":[{"year":1997,"claim":"Established that distinct classes of TGM1 mutation cause ichthyosis through separable mechanisms—transcriptional loss versus protein instability—both converging on loss of enzymatic activity.","evidence":"Northern blot, immunoblot, in situ TGase activity assay, and sequencing of patient alleles (Sp1-site promoter mutation; Gly143Glu, Val382Met missense)","pmids":["9359043"],"confidence":"Medium","gaps":["Does not resolve the structural basis of protein instability for the missense alleles","No reconstitution of crosslinking activity in vitro"]},{"year":2001,"claim":"Mapped function to specific protein regions by showing that both the beta-barrel 2 and core domains are required for TGase-1 activity and complete cornified envelope formation.","evidence":"In situ TGase activity assay and electron microscopy of a patient bearing a beta-barrel 2 frameshift and core-domain R388H missense mutation","pmids":["11251583"],"confidence":"Medium","gaps":["Single patient; contribution of each allele not separated","No direct structural measurement of domain perturbation"]},{"year":2004,"claim":"Defined the cis-regulatory logic of TGM1 expression, showing that cooperative AP1 and Sp1 sites in a distal promoter region drive tissue- and cell-layer-specific transcription.","evidence":"Transgenic mouse reporter assays, promoter deletion/mutation transfection in keratinocytes, and EMSA","pmids":["15061870"],"confidence":"High","gaps":["Specific AP1/Sp1 family members binding in vivo not identified","Upstream signals regulating these factors during differentiation unknown"]},{"year":2005,"claim":"Extended the functional requirement for TGase-1 crosslinking beyond epidermis to nail and hair cuticle, broadening the affected-tissue scope of TGM1 deficiency.","evidence":"SDS/DTT extraction with phase contrast and electron microscopy of scale, nail, and hair from genotyped patients (V518M plus inactive allele)","pmids":["16133457"],"confidence":"Medium","gaps":["Quantitative contribution of TGase-1 versus other transglutaminases in each appendage not parsed"]},{"year":2009,"claim":"Proposed a unifying structural explanation for many pathogenic alleles by positioning mutated arginines at domain interfaces critical for TGase-1 integrity, and quantified founder alleles.","evidence":"Homology structural modeling across 115 mutations from 234 ARCI patients plus haplotype analysis (c.877-2A>G founder effect)","pmids":["19241467"],"confidence":"Low","gaps":["Structural inference is computational only with no experimental structure","Interface disruption not validated biochemically"]},{"year":2011,"claim":"Provided an isozyme-specific in situ readout that localized active TGase-1 to defined epithelial tissues, separating its activity from TGase-2 in vivo.","evidence":"Fluorescence-labeled isozyme-specific 12-mer substrate peptides applied to whole-body mouse sections","pmids":["20876521"],"confidence":"Medium","gaps":["Substrate-peptide reporter reflects accessible activity, not endogenous physiological substrates","Does not identify in vivo crosslinked target proteins"]},{"year":2011,"claim":"Linked environmental dioxin exposure to altered TGM1 expression by showing expansion of TGase-1-positive epidermal layers in chloracne lesions.","evidence":"FISH for mRNA and immunohistochemistry for protein in chloracne versus healthy skin","pmids":["21237254"],"confidence":"Low","gaps":["Descriptive only; no mechanism linking dioxin signaling to TGM1 regulation","No functional consequence for barrier established"]},{"year":2012,"claim":"Connected residue-level genotype to temperature-dependent phenotype, implicating R307/R315 in thermolabile TGase-1 activity that explains site- and temperature-restricted disease.","evidence":"Genotype-phenotype correlation in 9 patients with bathing suit and self-improving collodion ichthyosis","pmids":["22801880"],"confidence":"Low","gaps":["No direct biochemical assay of temperature-dependent activity for these mutants","Thermolability mechanism inferred clinically only"]},{"year":2019,"claim":"Identified a post-translational control point by establishing ZDHHC13-mediated palmitoylation as required for TGase-1 protein stability and skin barrier integrity.","evidence":"Quantitative palmitoylation proteomics, biochemical palmitoylation confirmation, and an enzymatically dead ZDHHC13 knock-in mouse","pmids":["31669413"],"confidence":"High","gaps":["Palmitoylated cysteine residue(s) on TGase-1 not mapped","Mechanism linking palmitoylation to stability (trafficking, degradation) unresolved"]},{"year":2021,"claim":"Demonstrated therapeutic correctability of a pathogenic TGM1 allele, establishing base editing as a feasible strategy for restoring the locus.","evidence":"Adenine base editing (ABEmax-NG, Sc-ABEmax) of c.607C>T in zygotes with whole-genome and deep sequencing for off-target analysis","pmids":["33974999"],"confidence":"Medium","gaps":["No demonstration of restored TGase-1 activity or barrier function after editing","Delivery to differentiated epidermis not addressed"]},{"year":null,"claim":"The endogenous physiological substrates crosslinked by TGase-1 in the cornified envelope and the molecular mechanism linking palmitoylation to its stability remain undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No experimental crystal/cryo-EM structure to validate domain-interface model","In vivo crosslinked target proteins unidentified","Palmitoylation site and stability mechanism unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,3]}],"complexes":[],"partners":["ZDHHC13"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P22735","full_name":"Protein-glutamine gamma-glutamyltransferase K","aliases":["Epidermal TGase","Transglutaminase K","TG(K)","TGK","TGase K","Transglutaminase-1","TGase-1"],"length_aa":817,"mass_kda":89.8,"function":"Catalyzes the cross-linking of proteins and the conjugation of polyamines to proteins (PubMed:7629111, PubMed:8824274, PubMed:26220141, PubMed:20663883). Responsible for cross-linking epidermal proteins during formation of the stratum corneum (PubMed:26220141). Involved in cell proliferation (PubMed:26220141)","subcellular_location":"Cell membrane; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/P22735/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TGM1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TGM1","total_profiled":1310},"omim":[{"mim_id":"616293","title":"HORNERIN; HRNR","url":"https://www.omim.org/entry/616293"},{"mim_id":"613004","title":"HUNTINGTIN; HTT","url":"https://www.omim.org/entry/613004"},{"mim_id":"610378","title":"GLIS FAMILY ZINC FINGER PROTEIN 1; GLIS1","url":"https://www.omim.org/entry/610378"},{"mim_id":"607206","title":"ARACHIDONATE LIPOXYGENASE 3; ALOXE3","url":"https://www.omim.org/entry/607206"},{"mim_id":"607066","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY V, MEMBER 3; TRPV3","url":"https://www.omim.org/entry/607066"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":697.8}],"url":"https://www.proteinatlas.org/search/TGM1"},"hgnc":{"alias_symbol":["TGASE","TGK","LI","LI1"],"prev_symbol":["ICR2"]},"alphafold":{"accession":"P22735","domains":[{"cath_id":"2.60.40.10","chopping":"113-247","consensus_level":"high","plddt":94.4861,"start":113,"end":247},{"cath_id":"3.90.260.10","chopping":"262-564","consensus_level":"medium","plddt":94.702,"start":262,"end":564},{"cath_id":"2.60.40.10","chopping":"580-690","consensus_level":"high","plddt":92.5087,"start":580,"end":690},{"cath_id":"2.60.40.10","chopping":"695-787","consensus_level":"high","plddt":96.0103,"start":695,"end":787}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P22735","model_url":"https://alphafold.ebi.ac.uk/files/AF-P22735-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P22735-F1-predicted_aligned_error_v6.png","plddt_mean":84.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TGM1","jax_strain_url":"https://www.jax.org/strain/search?query=TGM1"},"sequence":{"accession":"P22735","fasta_url":"https://rest.uniprot.org/uniprotkb/P22735.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P22735/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P22735"}},"corpus_meta":[{"pmid":"21779515","id":"PMC_21779515","title":"Li-fraumeni 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dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/27061915","citation_count":8,"is_preprint":false},{"pmid":"34328321","id":"PMC_34328321","title":"Li3La2(BO3)3 and Li1.75Na1.25La2(BO3)3: A Great Enhancement in Birefringence Induced by Optimal Arrangement of π-Conjugated [BO3] Units.","date":"2021","source":"Inorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34328321","citation_count":8,"is_preprint":false},{"pmid":"25443852","id":"PMC_25443852","title":"mRNA Transcript abundance during plant growth and the influence of Li(+) exposure.","date":"2014","source":"Plant science : an international journal of experimental plant biology","url":"https://pubmed.ncbi.nlm.nih.gov/25443852","citation_count":8,"is_preprint":false},{"pmid":"27622479","id":"PMC_27622479","title":"Li-Fraumeni syndrome.","date":"2016","source":"Biomedica : revista del Instituto Nacional de Salud","url":"https://pubmed.ncbi.nlm.nih.gov/27622479","citation_count":7,"is_preprint":false},{"pmid":"21237254","id":"PMC_21237254","title":"Abnormal expression of MAPK, EGFR, CK17 and TGk in the skin lesions of chloracne patients exposed to dioxins.","date":"2011","source":"Toxicology letters","url":"https://pubmed.ncbi.nlm.nih.gov/21237254","citation_count":7,"is_preprint":false},{"pmid":"18428420","id":"PMC_18428420","title":"p53 Testing for Li-Fraumeni and Li-Fraumeni-like syndromes.","date":"2008","source":"Current protocols in human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18428420","citation_count":7,"is_preprint":false},{"pmid":"9753945","id":"PMC_9753945","title":"Glutathione transferase (class pi) and tissue transglutaminase (Tgase C) expression in pterygia.","date":"1998","source":"Korean journal of ophthalmology : KJO","url":"https://pubmed.ncbi.nlm.nih.gov/9753945","citation_count":7,"is_preprint":false},{"pmid":"38472489","id":"PMC_38472489","title":"A pan-cancer analysis of the oncogenic and immunological roles of transglutaminase 1 (TGM1) in human cancer.","date":"2024","source":"Journal of cancer research and clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/38472489","citation_count":7,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49078,"output_tokens":3784,"usd":0.101997,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10490,"output_tokens":3177,"usd":0.065937,"stage2_stop_reason":"end_turn"},"total_usd":0.167934,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers about TGM1 (transglutaminase 1, also known as TGASE, TGK, LI, LI1, ICR2 — though notably \"ICR2\" here is an alias for TGM1, not the imprinting control region papers).\n\nPapers clearly about TGM1 (keratinocyte transglutaminase 1):\n- PMID 19241467 (paper 9): TGM1 mutations, modeling\n- PMID 19890349 (paper 10): TGM1 mutations in SICI\n- PMID 11331204 (paper 19): TGase 3 (NOT TGM1 — different isoform, skip)\n- PMID 22496784 (paper 21): TGase 3 KO mice (NOT TGM1)\n- PMID 20876521 (paper 23): In situ detection of TGase 1 and TGase 2 activity\n- PMID 9359043 (paper 37): TGK gene mutations in lamellar ichthyosis\n- PMID 11251583 (paper 39): Novel TGM1 mutations in NBCIE\n- PMID 22801880 (paper 48): TGM1 mutations in BSI/SICI\n- PMID 31669413 (paper 46): ZDHHC13 palmitoylates TGM1\n- PMID 15061870 (paper 60): TGM1 promoter analysis\n- PMID 16133457 (paper 53): Structural changes from defective TGM1\n- PMID 30372788 (paper 52): TGM1 mutations, ARCI gene expression\n- PMID 22511925 (paper 58): TGM1 founder mutations\n- PMID 33974999 (paper 68): Base editing correction of TGM1 mutation\n- PMID 32436339 (paper 86): Novel TGM1 mutation in Mexico\n- PMID 26578203 (paper 92): Novel TGM1 mutations\n- PMID 27061915 (paper 93): Novel TGM1 mutations\n- PMID 21237254 (paper 97): TGk expression in chloracne\n- PMID 38472489 (paper 100): Pan-cancer analysis (exclude - catalog)\n- PMID 23192619 (paper 77): TGM1 founder mutation Tunisia\n\nPapers about TGase 4 (prostate TGase) - different gene, skip.\nPapers about TGase 2 - different gene, skip.\nPapers about TGase 3 - different gene, skip.\nPaper 49 (PMID 37590410): TGM1 here is a parasite TGF-β mimic protein from Heligmosomoides polygyrus - NOT the human TGM1 gene. Skip.\n\nNow extracting mechanistic discoveries from the relevant TGM1 papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Three novel point mutations in the TGM1 (TGK) gene cause lamellar ichthyosis: a promoter Sp1-site mutation that profoundly reduces TGK transcript levels (impairing transcription), and two missense mutations (Gly143Glu, Val382Met) that produce normal transcript levels but lead to absence of detectable TGK protein, suggesting structural instability. All three mutations result in drastically reduced transglutaminase 1 enzymatic activity as measured by in situ activity assay.\",\n      \"method\": \"Northern blot (transcript quantification), immunofluorescence and immunoblotting (protein detection), transglutaminase activity assay, DNA sequencing of exons and exon-intron borders\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (activity assay, immunoblot, Northern blot, sequencing) in a single lab study directly linking specific mutations to loss of TGase-1 activity and protein stability\",\n      \"pmids\": [\"9359043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Novel TGM1 mutations in a patient with non-bullous congenital ichthyosiform erythroderma: a frameshift mutation (9008delA) in the beta-barrel 2 domain (C-terminal) and a missense mutation R388H in the core domain. In situ TGase activity assay showed markedly reduced TGase 1 activity in the patient's epidermis. Electron microscopy revealed incomplete thickening of the cornified cell envelope during keratinization, establishing that both the beta-barrel 2 domain and core domain are required for normal TGase-1 function and cornified envelope formation.\",\n      \"method\": \"In situ TGase activity assay, electron microscopy, DNA sequencing of TGM1 exons and exon-intron borders\",\n      \"journal\": \"The British journal of dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in situ activity assay combined with electron microscopy and sequencing in a single patient study establishing domain-function relationships\",\n      \"pmids\": [\"11251583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A distal region of the TGM1 promoter (between -1.6 and -1.4 kb) containing AP1 and Sp1 binding sites is required for tissue-specific and cell-layer-specific expression of TGM1 in transgenic mice and cultured keratinocytes. Mutation of both Sp1 sites and the AP1 site together eliminated nearly all transcriptional activity, while single mutations had only small effects. The same distal region also drives expression in squamous metaplasia under vitamin A deprivation.\",\n      \"method\": \"Transgenic mouse reporter assay, EMSA (electrophoretic mobility shift assay), promoter deletion and mutation transfection assays in cultured keratinocytes, Western blotting and immunohistochemistry\",\n      \"journal\": \"BMC dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo transgenic assay plus in vitro mutagenesis and EMSA, multiple orthogonal methods in a single study establishing specific cis-regulatory elements controlling TGM1 expression\",\n      \"pmids\": [\"15061870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Defective TGM1-encoded transglutaminase 1 activity results in absence or paucity of cornified cell envelopes (CEs) not only in epidermal scale but also in nail and hair cuticle cells. A V518M heterozygous TGM1 mutation combined with an inactive allele confers cross-linking deficiency across multiple keratinizing epithelia. Phase contrast microscopy and electron microscopy confirmed loss of prominent cell borders and marginal bands in hair cuticle cells from TGM1-deficient patients.\",\n      \"method\": \"SDS/DTT extraction of epidermal scale, nail, and hair; phase contrast microscopy; electron microscopy; clinical genotyping\",\n      \"journal\": \"Archives of dermatological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct structural assay across multiple tissue types in a defined genotype-phenotype study, single lab with two orthogonal microscopy methods\",\n      \"pmids\": [\"16133457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Structural modeling of human TGase-1 using 115 TGM1 mutations from 234 ARCI patients revealed that all mutated arginine residues located in the two beta-barrel domains and two (R142, R143) in the beta-sandwich domain reside at domain interfaces, suggesting these positions are critical for maintaining proper domain-domain interactions necessary for TGase-1 structural integrity and function. The c.877-2A>G splice-site mutation accounts for 34% of all TGM1 mutant alleles, with founder effects in North American and Norwegian populations.\",\n      \"method\": \"Homology structural modeling of TGase-1; mutational analysis across 234 patients; haplotype analysis for founder effect\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Moderate — structural insight is computational modeling only (no experimental structural validation); population data is strong but mechanistic inference is model-based\",\n      \"pmids\": [\"19241467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Fluorescence-labeled isozyme-specific 12-amino acid substrate peptides enable rapid in situ detection of active TGase 1 (keratinocyte type) and TGase 2 (tissue type) with clearly distinct tissue distribution patterns in whole-body mouse sections. TGase 1 activity is strongly detected in epithelial tissues including tongue, developing teeth, forestomach, and skin epidermis, establishing the spatial pattern of active TGase 1 protein in vivo.\",\n      \"method\": \"In situ detection using fluorescence-labeled isozyme-specific substrate peptides; whole-body section analysis\",\n      \"journal\": \"The journal of histochemistry and cytochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional assay using isozyme-specific substrates validated across multiple tissues, single lab study with clear mechanistic specificity for TGase 1 activity localization\",\n      \"pmids\": [\"20876521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Specific TGM1 missense mutations affecting arginine at positions 307 or 315 are associated with temperature-sensitive phenotypes (bathing suit ichthyosis and self-improving collodion ichthyosis), suggesting that these arginine residues are critical for temperature-dependent TGase-1 activity, with the protein retaining partial function at cooler body surface temperatures but losing function at warmer core body temperature sites.\",\n      \"method\": \"Genotype-phenotype correlation in 9 patients; clinical phenotypic assessment; DNA sequencing identifying missense mutations\",\n      \"journal\": \"Archives of dermatology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genotype-phenotype correlation across multiple patients supports temperature-sensitive function of specific residues, but mechanistic inference is indirect; no direct biochemical assay of temperature sensitivity performed\",\n      \"pmids\": [\"22801880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The palmitoyl-acyl transferase ZDHHC13 palmitoylates TGM1 (transglutaminase 1), and this palmitoylation is critical for in vivo protein stability of TGase-1. Quantitative proteomic approaches identified TGM1 as a ZDHHC13 substrate, and biochemical assay confirmed palmitoylation. Loss of ZDHHC13 enzymatic activity (knock-in DQ-to-AA mutation) led to skin barrier defects and loss of TGase-1 stability, establishing palmitoylation as a post-translational modification required for TGase-1 function in skin barrier development.\",\n      \"method\": \"Quantitative proteomics to identify palmitoylation substrates; biochemical palmitoylation assay confirmation; knock-in mouse model with enzymatically dead ZDHHC13; protein stability assessment\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical assay confirming palmitoylation combined with in vivo knock-in model demonstrating loss of TGM1 protein stability, multiple orthogonal methods establishing ZDHHC13 as the writer for TGM1 palmitoylation\",\n      \"pmids\": [\"31669413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The pathogenic TGM1 mutation c.607C>T can be corrected in mutant zygotes by adenine base editing (ABE). Using ABEmax-NG with 20-bp sgRNA achieved 73.8% editing efficiency, and Sc-ABEmax with 19-bp sgRNA achieved 78.7% efficiency. Whole-genome sequencing confirmed precise DNA editing without detected off-target effects, establishing proof-of-concept for base-editing correction of TGM1 mutations.\",\n      \"method\": \"Adenine base editing (ABEmax-NG, Sc-ABEmax) in zygotes; whole-genome sequencing; deep sequencing for off-target analysis\",\n      \"journal\": \"Molecular therapy : the journal of the American Society of Gene Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gene correction demonstrated with two ABE systems and genomic sequencing validation, single lab study establishing technical feasibility\",\n      \"pmids\": [\"33974999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Abnormal expression of TGk (TGM1/transglutaminase 1) is detected in chloracne skin lesions from dioxin-exposed patients: TGk mRNA and protein positive signals, normally restricted to the stratum granulosum, were found more significantly distributed in both the stratum granulosum and stratum spinosum in chloracne tissues, suggesting dioxin exposure expands the epidermal layer expressing TGase-1.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH) for mRNA; immunohistochemistry for protein; comparison with healthy controls\",\n      \"journal\": \"Toxicology letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single IHC/FISH comparison study showing altered localization pattern; no functional or mechanistic follow-up; single lab, descriptive\",\n      \"pmids\": [\"21237254\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TGM1 encodes transglutaminase 1 (TGase-1/TGK), a calcium-dependent enzyme expressed in the suprabasal/granular layers of stratified squamous epithelia that crosslinks glutamine and lysine residues in structural proteins to form the cornified cell envelope; its expression is driven by a distal promoter region containing cooperative AP1 and Sp1 sites, its protein stability depends on palmitoylation by ZDHHC13, loss-of-function mutations (particularly in the core domain, beta-barrel domains, and key arginine residues at domain interfaces) abolish enzymatic activity and cornified envelope formation causing autosomal recessive congenital ichthyosis, and specific temperature-sensitive mutations at R307/R315 produce restricted or self-resolving disease phenotypes consistent with partial activity at cooler skin temperatures.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TGM1 encodes transglutaminase 1, a calcium-dependent crosslinking enzyme whose activity is concentrated in the differentiating layers of stratified squamous epithelia, where it forms the cornified cell envelope essential for skin barrier function [#5]. Loss of TGase-1 activity through point, frameshift, and splice mutations abolishes or markedly reduces enzymatic crosslinking and produces absent or incomplete cornified envelopes not only in epidermis but also in nail and hair cuticle cells, causing autosomal recessive congenital ichthyosis [#0, #1, #3]. Mutations cluster in functionally critical regions—the core domain, the beta-barrel 2 domain, and arginine residues positioned at domain interfaces—where they compromise structural integrity and catalytic function [#1, #4], and missense changes at R307/R315 confer temperature-sensitive phenotypes consistent with residual activity at cooler skin surface temperatures [#6]. Cell-layer- and tissue-specific expression of TGM1 is governed by a distal promoter region containing cooperative AP1 and Sp1 binding sites, whose combined mutation eliminates nearly all transcriptional activity [#2]. Post-translationally, TGase-1 is palmitoylated by the acyltransferase ZDHHC13, a modification required for its protein stability and for normal skin barrier development [#7]. Pathogenic TGM1 alleles are correctable by adenine base editing as a proof-of-concept therapeutic strategy [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established that distinct classes of TGM1 mutation cause ichthyosis through separable mechanisms—transcriptional loss versus protein instability—both converging on loss of enzymatic activity.\",\n      \"evidence\": \"Northern blot, immunoblot, in situ TGase activity assay, and sequencing of patient alleles (Sp1-site promoter mutation; Gly143Glu, Val382Met missense)\",\n      \"pmids\": [\"9359043\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not resolve the structural basis of protein instability for the missense alleles\", \"No reconstitution of crosslinking activity in vitro\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mapped function to specific protein regions by showing that both the beta-barrel 2 and core domains are required for TGase-1 activity and complete cornified envelope formation.\",\n      \"evidence\": \"In situ TGase activity assay and electron microscopy of a patient bearing a beta-barrel 2 frameshift and core-domain R388H missense mutation\",\n      \"pmids\": [\"11251583\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single patient; contribution of each allele not separated\", \"No direct structural measurement of domain perturbation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the cis-regulatory logic of TGM1 expression, showing that cooperative AP1 and Sp1 sites in a distal promoter region drive tissue- and cell-layer-specific transcription.\",\n      \"evidence\": \"Transgenic mouse reporter assays, promoter deletion/mutation transfection in keratinocytes, and EMSA\",\n      \"pmids\": [\"15061870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific AP1/Sp1 family members binding in vivo not identified\", \"Upstream signals regulating these factors during differentiation unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended the functional requirement for TGase-1 crosslinking beyond epidermis to nail and hair cuticle, broadening the affected-tissue scope of TGM1 deficiency.\",\n      \"evidence\": \"SDS/DTT extraction with phase contrast and electron microscopy of scale, nail, and hair from genotyped patients (V518M plus inactive allele)\",\n      \"pmids\": [\"16133457\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative contribution of TGase-1 versus other transglutaminases in each appendage not parsed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Proposed a unifying structural explanation for many pathogenic alleles by positioning mutated arginines at domain interfaces critical for TGase-1 integrity, and quantified founder alleles.\",\n      \"evidence\": \"Homology structural modeling across 115 mutations from 234 ARCI patients plus haplotype analysis (c.877-2A>G founder effect)\",\n      \"pmids\": [\"19241467\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Structural inference is computational only with no experimental structure\", \"Interface disruption not validated biochemically\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided an isozyme-specific in situ readout that localized active TGase-1 to defined epithelial tissues, separating its activity from TGase-2 in vivo.\",\n      \"evidence\": \"Fluorescence-labeled isozyme-specific 12-mer substrate peptides applied to whole-body mouse sections\",\n      \"pmids\": [\"20876521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate-peptide reporter reflects accessible activity, not endogenous physiological substrates\", \"Does not identify in vivo crosslinked target proteins\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Linked environmental dioxin exposure to altered TGM1 expression by showing expansion of TGase-1-positive epidermal layers in chloracne lesions.\",\n      \"evidence\": \"FISH for mRNA and immunohistochemistry for protein in chloracne versus healthy skin\",\n      \"pmids\": [\"21237254\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Descriptive only; no mechanism linking dioxin signaling to TGM1 regulation\", \"No functional consequence for barrier established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected residue-level genotype to temperature-dependent phenotype, implicating R307/R315 in thermolabile TGase-1 activity that explains site- and temperature-restricted disease.\",\n      \"evidence\": \"Genotype-phenotype correlation in 9 patients with bathing suit and self-improving collodion ichthyosis\",\n      \"pmids\": [\"22801880\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct biochemical assay of temperature-dependent activity for these mutants\", \"Thermolability mechanism inferred clinically only\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified a post-translational control point by establishing ZDHHC13-mediated palmitoylation as required for TGase-1 protein stability and skin barrier integrity.\",\n      \"evidence\": \"Quantitative palmitoylation proteomics, biochemical palmitoylation confirmation, and an enzymatically dead ZDHHC13 knock-in mouse\",\n      \"pmids\": [\"31669413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Palmitoylated cysteine residue(s) on TGase-1 not mapped\", \"Mechanism linking palmitoylation to stability (trafficking, degradation) unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated therapeutic correctability of a pathogenic TGM1 allele, establishing base editing as a feasible strategy for restoring the locus.\",\n      \"evidence\": \"Adenine base editing (ABEmax-NG, Sc-ABEmax) of c.607C>T in zygotes with whole-genome and deep sequencing for off-target analysis\",\n      \"pmids\": [\"33974999\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No demonstration of restored TGase-1 activity or barrier function after editing\", \"Delivery to differentiated epidermis not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The endogenous physiological substrates crosslinked by TGase-1 in the cornified envelope and the molecular mechanism linking palmitoylation to its stability remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimental crystal/cryo-EM structure to validate domain-interface model\", \"In vivo crosslinked target proteins unidentified\", \"Palmitoylation site and stability mechanism unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ZDHHC13\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}