{"gene":"FLG","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2009,"finding":"A homozygous 1-bp deletion (5303delA) in the murine Flg gene (analogous to human FLG null mutations) causes epidermal barrier deficiency; topical allergen application to these mice produces cutaneous inflammatory infiltrates and enhanced allergen-specific IgE responses, establishing that antigen transfer through a defective filaggrin-deficient epidermal barrier is a key mechanistic step in cutaneous sensitization.","method":"Mouse genetics (spontaneous Flg mutant), topical allergen challenge, histology, allergen-specific antibody measurement","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function mouse model with defined mechanistic phenotype (barrier breach → sensitization), replicated concept across labs","pmids":["19349982"],"is_preprint":false},{"year":2009,"finding":"The C-terminal region of filaggrin is essential for proper processing of profilaggrin into mature filaggrin peptides; FLG nonsense mutations located in C-terminal imperfect repeats (e.g., p.Lys4021X) cause remarkable reduction of filaggrin protein in the epidermis, demonstrating that no FLG mutation location shows genotype-phenotype correlation because all impair profilaggrin processing.","method":"Comprehensive FLG sequencing, immunohistochemical staining of profilaggrin/filaggrin in patient epidermis, real-time RT-PCR","journal":"The British journal of dermatology","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein expression analysis in patient skin with novel mutation; single lab with two orthogonal methods","pmids":["19663875","19958351"],"is_preprint":false},{"year":2016,"finding":"FLG loss-of-function mutations in atopic dermatitis keratinocytes lead to increased arachidonic acid and 12-lipoxygenase metabolites (12-HETE) in human epidermal equivalents; exogenous arachidonic acid increases inflammatory cytokine expression in control keratinocytes, while 12-HETE attenuates late epidermal differentiation markers, establishing an autocrine eicosanoid mechanism by which FLG mutations trigger both inflammation and impaired differentiation.","method":"Human epidermal equivalents from patient keratinocytes, lipidomic analysis, cytokine measurement, exogenous lipid mediator treatment","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 — patient-derived skin equivalents with multiple orthogonal readouts; single lab","pmids":["27793761"],"is_preprint":false},{"year":2011,"finding":"FLG knockdown in human keratinocytes assembled into 3D skin models causes impaired epidermal differentiation (histopathological changes), increased LDH leakage and IL-6/IL-8 release upon SDS irritation, and increased percutaneous absorption of lipophilic drugs, demonstrating that filaggrin deficiency directly causes barrier dysfunction and heightened susceptibility to irritants.","method":"siRNA knockdown, 3D organotypic skin model, histopathology, cytokine ELISA, percutaneous absorption assay","journal":"Alternatives to laboratory animals : ATLA","confidence":"Medium","confidence_rationale":"Tier 2 — clean loss-of-function with multiple functional readouts; single lab","pmids":["22103940"],"is_preprint":false},{"year":2018,"finding":"Rhodiola crenulata root extract upregulates FLG and loricrin (LOR) expression in keratinocytes through AHR activation in an OVOL1-dependent manner, while involucrin (IVL) upregulation is AHR-dependent but OVOL1-independent, defining an AHR→OVOL1→FLG regulatory axis for skin barrier gene expression.","method":"AHR and OVOL1 siRNA knockdown, qRT-PCR, keratinocyte culture with Rhodiola extract","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — pathway dissected by genetic knockdown with gene-specific readouts; single lab","pmids":["29866992"],"is_preprint":false},{"year":2019,"finding":"IL-13 downregulates the OVOL1-FLG axis in keratinocytes (and upregulates the periostin-IL-24 axis), establishing that the dominant Th2 cytokine in atopic dermatitis lesional skin mechanistically suppresses filaggrin expression through OVOL1.","method":"Keratinocyte cytokine treatment, gene expression analysis, GWAS integration","journal":"Immunology","confidence":"Medium","confidence_rationale":"Tier 3 — pathway placement supported by experimental and GWAS data; single lab review/synthesis","pmids":["31509236"],"is_preprint":false},{"year":2020,"finding":"Granzyme B (GzmB), elevated in atopic dermatitis, proteolytically cleaves filaggrin (FLG) and E-cadherin extracellularly, directly impairing epidermal barrier function; GzmB-/- mice show significantly reduced inflammation, epidermal thickening, and lesion formation in an oxazolone dermatitis model, and a small-molecule GzmB inhibitor reduces disease severity.","method":"GzmB knockout mice, oxazolone model, topical GzmB inhibitor, in vitro cleavage assay","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1–2 — genetic KO with defined phenotype plus in vitro cleavage assay identifying FLG as direct GzmB substrate; multiple orthogonal methods","pmids":["32504614"],"is_preprint":false},{"year":2021,"finding":"IL-4 and IL-13 induce nuclear accumulation of full-length IL-33 in keratinocytes via MAPK/ERK signaling; nuclear IL-33 acts as a transcription cofactor of phosphorylated STAT3, increasing pSTAT3 binding to the FLG promoter and thereby inhibiting FLG transcription; the nuclear IL-33/pSTAT3 complex also reduces RUNX1 expression, downregulating loricrin, keratin 1, and keratin 10.","method":"Monolayer keratinocyte culture, living skin equivalents, MAPK/ERK inhibitors, ChIP (pSTAT3 binding to FLG promoter), co-immunoprecipitation, siRNA knockdown","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP demonstrating direct pSTAT3 binding to FLG promoter, Co-IP for complex, functional rescue; multiple orthogonal methods in single lab","pmids":["33865911"],"is_preprint":false},{"year":2021,"finding":"IL-31 similarly increases nuclear full-length IL-33 and pSTAT3 in keratinocytes; the nuclear IL-33/pSTAT3 complex binds the FLG promoter to inhibit FLG transcription and reduces RUNX1 to downregulate keratin 1 and keratin 10, revealing a shared mechanism by which multiple Th2/pruritic cytokines converge on nuclear IL-33 to suppress filaggrin and epidermal differentiation.","method":"Monolayer keratinocyte culture, living skin equivalents, ChIP, Co-IP, siRNA knockdown","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP and Co-IP with functional validation; mechanistically replicates IL-4/IL-13 finding with IL-31 in same system","pmids":["34293350"],"is_preprint":false},{"year":2017,"finding":"GATA3 is a transcriptional regulator of filaggrin expression in keratinocytes: GATA3 knockdown by shRNA significantly reduces FLG and FLG2 mRNA under atopic dermatitis-like conditions, while GATA3 overexpression restores and upregulates FLG and FLG2 expression.","method":"shRNA knockdown, overexpression, qRT-PCR in keratinocytes; immunohistochemistry in patient skin biopsies","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — bidirectional genetic manipulation (KD and OE) with consistent FLG expression readout; single lab","pmids":["28928464"],"is_preprint":false},{"year":2023,"finding":"CRISPR/Cas9 knockout of FLG in human N/TERT-2G keratinocytes causes loss of keratohyalin granules, reduction of multiple structural proteins (involucrin, hornerin, keratin 2, transglutaminase 1), denser stratum corneum lacking basket-weave architecture, and compromised epidermal barrier (increased TEWL, altered impedance); correction of FLG reinstates all these features, establishing that filaggrin is causally required for normal epidermal differentiation and orchestrates expression of other epidermal structural proteins.","method":"CRISPR/Cas9 knockout, human epidermal equivalents, immunohistochemistry, TEWL measurement, electrical impedance spectroscopy, FLG re-expression rescue","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1–2 — clean isogenic CRISPR KO with rescue, multiple functional readouts confirming causality","pmids":["36893939"],"is_preprint":false},{"year":2022,"finding":"FLG-deficient neonatal mice show increased epidermal dye penetration and elevated skin CD4+ T cells; commensal bacteria (S. epidermidis)-specific CD4+ T cells are skewed toward effector rather than regulatory T cells in Flg-/- pups, and this Th17-biased response persists into adulthood, causing increased susceptibility to imiquimod-induced skin inflammation, establishing a mechanism by which FLG deficiency in neonatal skin shapes the long-term commensal-specific immune response.","method":"Flg-/- mouse model (C57BL/6), single-cell RNA sequencing, flow cytometry, engineered S. epidermidis 2W colonization, imiquimod challenge","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with scRNA-seq and flow cytometry; mechanistic link from FLG deficiency to specific immune cell skewing with functional consequence","pmids":["36496196"],"is_preprint":false},{"year":2021,"finding":"FLG-deficient mice on pure BALB/c background (generated by CRISPR targeting) develop ichthyosis and a barrier defect with facilitated percutaneous sensitization but do NOT spontaneously develop dermatitis or systemic atopy; whole-genome sequencing revealed that previously reported atopy in Flgft/ft BALB/c mice was caused by a co-segregating homozygous Tmem79matted mutation, demonstrating that FLG deficiency alone lowers the sensitization threshold but does not cause atopy.","method":"CRISPR/Cas9 Flg knockout on BALB/c background, whole-genome sequencing, TEWL measurement, IgE assay, percutaneous sensitization","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — isogenic CRISPR KO with whole-genome sequencing to resolve confounding mutation; clean mechanistic dissection","pmids":["33894197"],"is_preprint":false},{"year":2024,"finding":"GSDMD (gasdermin D), activated by Caspase-1, inhibits FLG expression by stabilizing HDAC1: GSDMD blocks the interaction between KCTD6 (an E3 ligase adaptor) and HDAC1, preventing HDAC1 ubiquitin-mediated degradation; accumulated HDAC1 then reduces histone acetylation at the FLG promoter, repressing FLG transcription. This GSDMD→HDAC1→FLG axis links pyroptosis activation to epidermal barrier dysfunction in atopic dermatitis.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), dual-luciferase reporter assay, siRNA/overexpression, Western blot, immunohistochemistry in AD patient lesions","journal":"PeerJ","confidence":"Medium","confidence_rationale":"Tier 1–2 — ChIP, Co-IP and reporter assay define mechanism; single lab","pmids":["38250727"],"is_preprint":false},{"year":2025,"finding":"A phenylalanine amide compound (Compound 8.1) promotes FLG expression and other skin barrier-related genes in normal human epidermal keratinocytes through aryl hydrocarbon receptor (AHR) activation; AHR knockdown abolishes this effect; structure-activity analysis shows the compound preferentially activates keratinocyte differentiation genes while minimally inducing CYP1A1, suggesting dissociation of AHR-mediated barrier gene induction from xenobiotic toxicity pathways.","method":"NHEK culture, microarray gene expression profiling, AHR siRNA knockdown, structure-activity relationship analysis","journal":"Journal of pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — AHR knockdown validates pathway; microarray plus mechanistic follow-up; single lab","pmids":["40713347"],"is_preprint":false}],"current_model":"Filaggrin (FLG) is a structural protein of the cornified envelope whose expression in terminally differentiating keratinocytes is transcriptionally regulated by AHR→OVOL1, GATA3, and repressed by Th2/pruritic cytokines (IL-4, IL-13, IL-31) via a nuclear IL-33/pSTAT3 complex that binds the FLG promoter, and by GSDMD-stabilized HDAC1 through histone deacetylation at the FLG promoter; FLG is causally required for formation of keratohyalin granules, stratum corneum architecture, and expression of other epidermal structural proteins (involucrin, hornerin, keratin 2, transglutaminase 1), while FLG deficiency lowers the barrier to percutaneous allergen sensitization (enabling cutaneous IgE responses) and skews neonatal commensal-specific CD4+ T cells toward Th17-effector fates, and mature filaggrin protein can be proteolytically cleaved extracellularly by granzyme B, further impairing barrier function in inflammatory skin disease."},"narrative":{"teleology":[],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":[]},"mechanistic_narrative":"Insufficient on-target evidence to synthesize a narrative — discovery timeline does not match the canonical FLG protein."},"prefetch_data":{"uniprot":{"accession":"P20930","full_name":"Filaggrin","aliases":[],"length_aa":4061,"mass_kda":435.2,"function":"Aggregates keratin intermediate filaments and promotes disulfide-bond formation among the intermediate filaments during terminal differentiation of mammalian epidermis","subcellular_location":"Cytoplasmic granule","url":"https://www.uniprot.org/uniprotkb/P20930/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FLG","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/FLG","total_profiled":1310},"omim":[{"mim_id":"618084","title":"PEELING SKIN SYNDROME 6; PSS6","url":"https://www.omim.org/entry/618084"},{"mim_id":"617655","title":"PECANEX 1; PCNX1","url":"https://www.omim.org/entry/617655"},{"mim_id":"616293","title":"HORNERIN; HRNR","url":"https://www.omim.org/entry/616293"},{"mim_id":"616284","title":"FILAGGRIN FAMILY MEMBER 2; FLG2","url":"https://www.omim.org/entry/616284"},{"mim_id":"615241","title":"TERMINAL DIFFERENTIATION-INDUCED NONCODING RNA; TINCR","url":"https://www.omim.org/entry/615241"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytoplasmic bodies","reliability":"Enhanced"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"skin 1","ntpm":432.6}],"url":"https://www.proteinatlas.org/search/FLG"},"hgnc":{"alias_symbol":["FLG1","FLG-1"],"prev_symbol":[]},"alphafold":{"accession":"P11362","domains":[{"cath_id":"2.60.40.10","chopping":"41-119","consensus_level":"high","plddt":87.2459,"start":41,"end":119},{"cath_id":"2.60.40.10","chopping":"152-249","consensus_level":"medium","plddt":88.8383,"start":152,"end":249},{"cath_id":"2.60.40.10","chopping":"254-360","consensus_level":"medium","plddt":88.4377,"start":254,"end":360},{"cath_id":"3.30.200.20","chopping":"468-564","consensus_level":"medium","plddt":90.5341,"start":468,"end":564},{"cath_id":"1.10.510.10","chopping":"569-764","consensus_level":"medium","plddt":85.9447,"start":569,"end":764}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P11362","model_url":"https://alphafold.ebi.ac.uk/files/AF-P11362-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P11362-F1-predicted_aligned_error_v6.png","plddt_mean":73.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FLG","jax_strain_url":"https://www.jax.org/strain/search?query=FLG"},"sequence":{"accession":"P11362","fasta_url":"https://rest.uniprot.org/uniprotkb/P11362.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P11362/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P11362"}},"corpus_meta":[{"pmid":"1656221","id":"PMC_1656221","title":"A 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interactome.","date":"2021","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/33961781","citation_count":705,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"32879300","id":"PMC_32879300","title":"FGF/FGFR signaling in health and disease.","date":"2020","source":"Signal transduction and targeted therapy","url":"https://pubmed.ncbi.nlm.nih.gov/32879300","citation_count":678,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1697263","id":"PMC_1697263","title":"Cloning and expression of two distinct high-affinity receptors cross-reacting with acidic and basic fibroblast growth factors.","date":"1990","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/1697263","citation_count":673,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21160078","id":"PMC_21160078","title":"Frequent and focal FGFR1 amplification associates with therapeutically tractable FGFR1 dependency in squamous cell lung cancer.","date":"2010","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/21160078","citation_count":673,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21873635","id":"PMC_21873635","title":"Phylogenetic-based propagation of functional annotations within the Gene Ontology consortium.","date":"2011","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/21873635","citation_count":656,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19920251","id":"PMC_19920251","title":"Tyrosine phosphorylation inhibits PKM2 to promote the Warburg effect and tumor growth.","date":"2009","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/19920251","citation_count":652,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"17623664","id":"PMC_17623664","title":"Tissue-specific expression of betaKlotho and fibroblast growth factor (FGF) receptor isoforms determines metabolic activity of FGF19 and FGF21.","date":"2007","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17623664","citation_count":645,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22837387","id":"PMC_22837387","title":"Transforming fusions of FGFR and TACC genes in human glioblastoma.","date":"2012","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/22837387","citation_count":640,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20179196","id":"PMC_20179196","title":"FGFR1 amplification drives endocrine therapy resistance and is a therapeutic target in breast cancer.","date":"2010","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/20179196","citation_count":585,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16273093","id":"PMC_16273093","title":"A quantitative protein interaction network for the ErbB receptors using protein microarrays.","date":"2005","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/16273093","citation_count":568,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12627230","id":"PMC_12627230","title":"Loss-of-function mutations in FGFR1 cause autosomal dominant Kallmann syndrome.","date":"2003","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12627230","citation_count":566,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"1709094","id":"PMC_1709094","title":"FGFR-4, a novel acidic fibroblast growth factor receptor with a distinct expression pattern.","date":"1991","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/1709094","citation_count":553,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"33845483","id":"PMC_33845483","title":"Multilevel proteomics reveals host perturbations by SARS-CoV-2 and SARS-CoV.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/33845483","citation_count":532,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"7874169","id":"PMC_7874169","title":"A common mutation in the fibroblast growth factor receptor 1 gene in Pfeiffer syndrome.","date":"1994","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/7874169","citation_count":504,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"10490103","id":"PMC_10490103","title":"Structural basis for FGF receptor dimerization and activation.","date":"1999","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/10490103","citation_count":494,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"8125298","id":"PMC_8125298","title":"Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with 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assay plus cross-linking/IP, foundational identity paper\",\n      \"pmids\": [\"2554327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Tyr-766 in the carboxy-terminal cytoplasmic domain of FGFR1/FLG is an autophosphorylation site; the phosphorylated peptide surrounding Tyr-766 binds specifically to the SH2 domain (but not SH3 or other domains) of PLC-γ1, identifying this site as the major docking site for PLC-γ1 on FGFR1.\",\n      \"method\": \"Direct sequencing of tryptic phosphopeptides from in vitro and in-cell phosphorylated receptor, fusion-protein binding assays with SH2/SH3 domain constructs of PLC-γ1\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro phosphopeptide sequencing plus domain-mapping binding assay, replicated in living cells\",\n      \"pmids\": [\"1656221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"The murine FLG/FGFR1 protein is a transmembrane receptor with three extracellular immunoglobulin-like domains and a cytoplasmic tyrosine kinase domain; anti-peptide antibodies to the carboxy-terminus immunoprecipitate three fibroblast cell proteins (p150, p130, p105) that undergo phosphorylation in immune-complex assays, and the same antibody co-precipitates cross-linked bFGF/receptor and aFGF/receptor complexes.\",\n      \"method\": \"cDNA cloning and sequencing, immune-complex kinase assay, covalent cross-linking with 125I-FGFs, immunoprecipitation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — sequencing plus in vitro kinase assay plus cross-linking/IP\",\n      \"pmids\": [\"2161096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Four tyrosine residues were identified as phosphorylation sites in FGFR1/FLG: Tyr-653 (major, within the catalytic domain, homologous to activation-loop sites in Src and insulin receptor kinases), Tyr-766 (secondary, C-terminal), and Tyr-154 and Tyr-307 in the extracellular domain.\",\n      \"method\": \"Baculoviral recombinant FGFR1 phosphorylated and fragmented; phosphotyrosine peptides purified by anti-phosphotyrosine chromatography and analyzed by Edman degradation and electrospray tandem mass spectrometry\",\n      \"journal\": \"Protein science : a publication of the Protein Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct mass spectrometric identification with Edman degradation confirmation\",\n      \"pmids\": [\"8443592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Alternative splicing of the FLG/FGFR1 gene produces two isoforms: a larger form with three extracellular immunoglobulin-like domains (alpha) and a shorter form lacking the first (most external) Ig-like domain; in human placenta the shorter form is the major isoform.\",\n      \"method\": \"cDNA structural analysis, gene organization analysis revealing cassette and internal donor alternative splicing mechanisms, tissue expression analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gene cloning and splice-form characterization, single lab\",\n      \"pmids\": [\"1847058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"A splice variant of FGFR1/FLG (gamma isoform) generated by alternate 3'-acceptor site usage—resulting in a two-Ig-loop receptor—is increased in rat prostate tumors and confers anchorage-independent growth (soft agar colony formation) to cells expressing non-secreted heparin-binding FGFs.\",\n      \"method\": \"cDNA cloning and sequencing, soft-agar transformation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional transformation assay plus molecular characterization, single lab\",\n      \"pmids\": [\"1312829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Distinct isoforms of FLG/FGFR1 (alpha with three Ig loops, beta with two Ig loops) are expressed in a cell-type-specific pattern; the NH2-terminal Loop I of the alpha isoform interacts with the COOH-terminal Loops II and III, suggesting the two isoforms have distinct tertiary structures and potentially distinct ligand-binding activities.\",\n      \"method\": \"Baculoviral and bacterial expression of domain subdomains, panel of 16 isoform/domain-specific antibodies, epitope mapping with synthetic peptides and deletion mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple antibody mapping and structural inference from recombinant deletions, single lab\",\n      \"pmids\": [\"1325449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Binding of 125I-aFGF to FLG/FGFR1 overexpressed on NIH 3T3 cells requires heparin for high-affinity (Kd ~0.27 nM) single-site binding; pertussis toxin pretreatment reduces ligand binding affinity in a heparin-dependent fashion, suggesting the receptor may couple to a Gi protein in addition to its intrinsic tyrosine kinase activity.\",\n      \"method\": \"Radioligand binding assay with 125I-aFGF on membrane preparations from stably transfected NFlg26 cells; pertussis and cholera toxin pretreatment; guanine nucleotide competition\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative radioligand binding plus pharmacological dissection, single lab\",\n      \"pmids\": [\"1383494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A homozygous 1-bp deletion (5303delA) in the murine Flg gene in the flaky tail mouse causes filaggrin deficiency, and topical allergen application to these mice produces cutaneous inflammatory infiltrates and enhanced allergen-specific antibody (IgE) responses, establishing that antigen transfer through a filaggrin-deficient epidermal barrier is a key mechanism for IgE sensitization.\",\n      \"method\": \"Mouse genetics (spontaneous mutant characterization), topical allergen challenge, allergen-specific antibody measurement, skin histology\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic mouse model with defined molecular lesion and multiple functional readouts, highly cited\",\n      \"pmids\": [\"19349982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FLG nonsense mutations in the C-terminal imperfect filaggrin repeat lead to remarkable reduction of filaggrin protein in the epidermis, supporting the conclusion that the C-terminal region is essential for proper processing of profilaggrin to filaggrin.\",\n      \"method\": \"Immunohistochemical staining for profilaggrin/filaggrin protein in patient epidermis carrying p.Lys4021X; real-time RT-PCR for FLG mRNA\",\n      \"journal\": \"The British journal of dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein quantification in patient tissue plus mRNA, single lab\",\n      \"pmids\": [\"19663875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IL-13 downregulates FLG expression through the OVOL1-FLG axis in skin: IL-13 reduces OVOL1 (a transcription factor), which in turn reduces FLG transcription, contributing to epidermal barrier dysfunction in atopic dermatitis.\",\n      \"method\": \"Cell culture experiments with cytokine treatment, transcription factor knockdown/expression analysis\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — mechanistic pathway placement by gene expression manipulation, single lab review-type article\",\n      \"pmids\": [\"31509236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Nuclear IL-33 binds phosphorylated STAT3 and functions as a STAT3 transcription cofactor; the nuclear IL-33/pSTAT3 complex binds to the FLG promoter to inhibit its transcription in response to IL-4 and IL-13, directly suppressing keratinocyte differentiation.\",\n      \"method\": \"Monolayer keratinocyte culture and living skin equivalent, MEK/ERK inhibition, chromatin immunoprecipitation (ChIP) of pSTAT3 at FLG promoter, siRNA knockdown, IL-33 overexpression\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP directly demonstrating pSTAT3 binding to FLG promoter plus loss-of-function and gain-of-function, multiple orthogonal methods\",\n      \"pmids\": [\"33865911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-31 uses the same nuclear IL-33/pSTAT3 mechanism to inhibit FLG transcription: IL-31 increases nuclear full-length IL-33 and pSTAT3 in keratinocytes, and the complex binds the FLG promoter; additionally, IL-31 reduces RUNX1 availability via STAT3/STAT6 to downregulate keratin 1 and keratin 10.\",\n      \"method\": \"Monolayer keratinocyte culture and living skin equivalent, ChIP for pSTAT3 at FLG promoter, STAT3 siRNA, IL-33 siRNA/overexpression\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP plus orthogonal genetic manipulations, mechanistically consistent with companion paper\",\n      \"pmids\": [\"34293350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Granzyme B (GzmB) cleaves FLG extracellularly and also cleaves E-cadherin, thereby impairing epithelial barrier function; GzmB-/- mice show significantly reduced inflammation, epidermal thickening, and lesion formation in an oxazolone-induced dermatitis model.\",\n      \"method\": \"GzmB knockout mouse model compared to wild-type in oxazolone dermatitis; small-molecule GzmB inhibitor topical application; mechanistic identification of FLG and E-cadherin as GzmB substrates\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout plus pharmacological inhibition plus substrate identification, multiple orthogonal approaches\",\n      \"pmids\": [\"32504614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rhodiola crenulata root extract upregulates FLG and LOR expression via the AHR-OVOL1 axis in keratinocytes, establishing that AHR activation induces OVOL1 which in turn drives FLG expression; IVL upregulation by the same extract is AHR-dependent but OVOL1-independent.\",\n      \"method\": \"Human keratinocyte culture with AHR inhibition and OVOL1 siRNA knockdown, gene expression analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway placement by receptor antagonism and transcription factor knockdown, single lab\",\n      \"pmids\": [\"29866992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GATA3 transcription factor positively regulates FLG and FLG2 expression in human keratinocytes: shRNA knockdown of GATA3 significantly reduces filaggrin mRNA under atopic dermatitis-like conditions, and GATA3 overexpression reverses this and upregulates FLG and FLG2.\",\n      \"method\": \"Human primary keratinocyte shRNA knockdown and overexpression of GATA3, mRNA quantification under inflammatory conditions\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional genetic manipulation (KD and OE) with defined mRNA readout, single lab\",\n      \"pmids\": [\"28928464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GSDMD (gasdermin D), activated by Caspase-1, inhibits FLG expression via HDAC1: activated GSDMD blocks KCTD6-mediated HDAC1 degradation, stabilizing HDAC1, which then reduces histone acetylation at the FLG promoter to repress FLG transcription in keratinocytes.\",\n      \"method\": \"AD patient IHC, gain-of-function GSDMD overexpression and Caspase-1 siRNA in human keratinocytes, HDAC1 siRNA/overexpression, co-immunoprecipitation (GSDMD-HDAC1-KCTD6 interaction), ChIP (histone acetylation at FLG promoter), dual-luciferase reporter\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP plus Co-IP plus multiple genetic manipulations establishing causal epigenetic mechanism, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"38250727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CRISPR/Cas9 knockout of FLG in human N/TERT-2G keratinocytes causes loss of structural proteins (involucrin, hornerin, keratin 2, transglutaminase 1), abnormal stratum corneum formation (denser, lacking basket-weave pattern), and measurable epidermal barrier compromise (increased transepidermal water loss and altered electrical impedance); correction of FLG reinstates keratohyalin granules, protein expression, and barrier function, establishing FLG as a causal orchestrator of epidermal differentiation.\",\n      \"method\": \"CRISPR/Cas9 FLG knockout in human keratinocytes, human epidermal equivalent cultures, IHC, TEWL measurement, electrical impedance spectroscopy, rescue with FLG re-expression\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — isogenic CRISPR KO with rescue, multiple orthogonal functional readouts\",\n      \"pmids\": [\"36893939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AHR activation by phenylalanine amide derivative Compound 8.1 promotes FLG expression in normal human epidermal keratinocytes, with microarray profiling confirming AHR-dependent upregulation of FLG and other skin barrier differentiation genes.\",\n      \"method\": \"Normal human epidermal keratinocyte culture, AHR inhibition, microarray gene expression profiling, structure-activity relationship analysis\",\n      \"journal\": \"Journal of pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological AHR activation plus inhibition plus transcriptome profiling, single lab\",\n      \"pmids\": [\"40713347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FLG loss-of-function mutations alter epidermal eicosanoid metabolism: human epidermal equivalents from FLG-mutated donors show increased arachidonic acid and 12-lipoxygenase metabolites; arachidonic acid treatment of control equivalents increases inflammatory cytokines, while 12-HETE attenuates late differentiation markers, establishing an autocrine eicosanoid loop downstream of FLG deficiency.\",\n      \"method\": \"Human epidermal equivalents from genotyped patient keratinocytes, lipid mediator analysis, cytokine measurement, exogenous arachidonic acid and 12-HETE treatment\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isogenic genotyped human tissue models with pharmacological dissection, single lab\",\n      \"pmids\": [\"27793761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FLG knockdown in 3D human skin models causes impaired epidermal differentiation, increased barrier permeability to lipophilic drugs, and enhanced inflammatory response (elevated IL-6 and IL-8, LDH leakage) upon SDS irritation, establishing a direct causal link between FLG deficiency and barrier/inflammatory phenotype.\",\n      \"method\": \"siRNA FLG knockdown in human keratinocytes, 3D skin model reconstruction, histopathology, percutaneous absorption assay, SDS irritation challenge with cytokine measurement\",\n      \"journal\": \"Alternatives to laboratory animals : ATLA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with multiple functional readouts, single lab\",\n      \"pmids\": [\"22103940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FLG deficiency in neonatal mouse skin skews commensal-specific CD4+ T cells toward effector (Th17) rather than regulatory T cells during skin colonization by S. epidermidis, and this altered response persists into adulthood with increased susceptibility to imiquimod-induced skin inflammation.\",\n      \"method\": \"Flg-/- mouse genetic model, single-cell RNA sequencing, flow cytometry, engineered S. epidermidis colonization, imiquimod skin challenge, TEWL and epidermal dye penetration assays\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with mechanistic immune phenotyping via scRNA-seq plus multiple functional assays\",\n      \"pmids\": [\"36496196\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Filaggrin (FLG/FGFR1 in the FGFR context; filaggrin protein encoded by the skin FLG gene) is mechanistically established as: (1) when referring to FGFR1, the receptor tyrosine kinase for acidic and basic FGF whose autophosphorylation at Tyr-653 (activation loop) and Tyr-766 (C-terminal) enables recruitment of PLC-γ1 via its SH2 domain to pTyr-766 and downstream signaling; (2) when referring to the skin structural protein filaggrin, a critical orchestrator of terminal keratinocyte differentiation and epidermal barrier integrity whose loss (via null mutations or transcriptional repression by IL-4/IL-13/IL-31 acting through a nuclear IL-33–pSTAT3 complex binding the FLG promoter, or by GSDMD-HDAC1-mediated histone deacetylation, or by extracellular cleavage by granzyme B) causes defective stratum corneum formation, increased transepidermal water loss, altered eicosanoid signaling, skewed skin immune responses to commensals, and facilitated percutaneous allergen sensitization.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI need to carefully classify each paper before extracting discoveries.\n\nThe gene query is **FLG = Filaggrin** (the skin barrier protein encoded by the filaggrin gene, important in ichthyosis vulgaris and atopic dermatitis).\n\nHowever, many papers in this corpus are about **FLG = fms-like gene = FGFR1** (fibroblast growth factor receptor 1), which is a completely different protein. This is a classic alias collision: the early FGFR1 literature used \"flg\" as the gene symbol before it was renamed FGFR1.\n\nAdditionally, some papers are about:\n- FLG 29.1 cell line (a leukemic preosteoclast cell line — not the filaggrin gene)\n- Bacterial *flg* operons (flagella genes)\n- FLG-AS1 lncRNA (alt-locus product)\n- fLG = fluorescent L-glucose analogue\n- FLG = few-layer graphene\n- Onconase FL-G zymogen\n\nLet me classify:\n\n**KEEP (filaggrin gene/protein):**\n- [3] PMID:19349982 — Flg mouse mutation, filaggrin deficiency, percutaneous allergen priming\n- [6] PMID:16990802 — FLG null mutations, atopic dermatitis\n- [8] PMID:22951058 — FLG mutations, AD persistence\n- [10] PMID:19958351 — FLG mutations, ichthyosis vulgaris, filaggrin processing\n- [14] PMID:31509236 — IL-13-OVOL1-FLG axis\n- [21] PMID:19663875 — FLG mutation p.Lys4021X, C-terminal region essential for profilaggrin processing\n- [23] PMID:27793761 — FLG mutations, eicosanoid metabolism, epidermal differentiation\n- [24] PMID:22103940 — FLG knockdown model, epidermal differentiation\n- [25] PMID:29866992 — RCE upregulates FLG via AHR-OVOL1\n- [33] PMID:32504614 — Granzyme B cleaves FLG and E-cadherin\n- [36] PMID:34198894 — Review, FLG regulation in AD\n- [38] PMID:33865911 — Nuclear IL-33/STAT3 suppresses FLG transcription\n- [40] PMID:28928464 — GATA3 regulates FLG expression\n- [43] PMID:34293350 — Nuclear IL-33/STAT3 in IL-31-mediated FLG downregulation\n- [53] PMID:36893939 — CRISPR FLG knockout, epidermal barrier, differentiation\n- [54] PMID:36496196 — FLG deficiency alters CD4+ T-cell response\n- [64] PMID:33894197 — FLG-deficient mice, barrier defect, no spontaneous atopy\n- [75] PMID:38250727 — GSDMD/HDAC1 suppresses FLG expression\n- [90] PMID:35537882 — FLG genotype, transcriptome, microbiome in AD\n- [100] PMID:40713347 — Phenylalanine amide/AHR promotes FLG expression\n\n**EXCLUDE (FGFR1/flg alias collision):**\n[1] PMID:1656221 — FGFR1 (flg), PLC-gamma binding\n[2] PMID:1667382 — flg/bek developmental expression (FGFR)\n[4] PMID:1403086 — flg mRNA in brain injury (FGFR1)\n[5] PMID:1851551 — BEK and FLG gene amplification in breast cancer (FGFR genes)\n[7] PMID:2554327 — FLG encodes aFGF receptor (FGFR1)\n[9] PMID:1321062 — FGFR-1/flg expression in mouse embryo\n[11] PMID:2161096 — murine flg encodes FGF receptor (FGFR1)\n[13] PMID:1325449 — flg receptor isoforms (FGFR1)\n[16] PMID:7510570 — flg mRNA in hippocampus (FGFR1)\n[18] PMID:1648703 — Flg-2, FGF receptor family (FGFR3)\n[19] PMID:17099154 — flg-1 receptor for bFGF in canine tumors (FGFR1)\n[27] PMID:7734730 — FGFR-1/cek-1/flg in heart development\n[28] PMID:1312829 — flg splice variant, transforming activity (FGFR1)\n[29] PMID:8853990 — FGF receptor-1/flg in lens (FGFR1)\n[31] PMID:8443592 — Phosphorylation sites in flg tyrosine kinase (FGFR1)\n[34] PMID:10670490 — FGFR1/flg upregulation in photoreceptors\n[39] PMID:8547216 — flg and bek in liver (FGFR1/2)\n[46] PMID:1847058 — human FGFR/flg isoforms by alternative splicing\n[58] PMID:1648916 — murine flg cDNA (FGFR1)\n[82] PMID:1383494 — aFGF binding to FGF-flg receptor (FGFR1)\n[87] PMID:15041185 — flg receptor in murine AIDS (FGFR1)\n\n**EXCLUDE (FLG 29.1 cell line — preosteoclastic leukemia cell line, not filaggrin):**\n[15] PMID:11080495 — FLG 29.1 cells, HERG K+ channels\n[17] PMID:1309813 — FLG 29.1 cell line establishment\n[35] PMID:8780889 — FLG 29.1, c-kit receptors\n[47] PMID:7754798 — FLG 29.1, bone sialoprotein\n[49] PMID:10049770 — FLG 29.1, estradiol apoptosis\n[50] PMID:9844106 — FLG 29.1, Src family kinases\n[55] PMID:9056169 — FLG 29.1, 150kD antigen\n[59] PMID:15894134 — FLG 29.1, bee venom, aromatase\n[63] PMID:9719444 — FLG 29.1, aromatase expression\n[79] PMID:7598715 — FLG 29.1, LY 139478\n[80] PMID:9398606 — FLG 29.1, raloxifene\n[88] PMID:16873093 — FLG 29.1, Buthus martensi\n[95] PMID:15002571 — FLG 29.1, gravitational unloading\n\n**EXCLUDE (bacterial flg operons):**\n[20] PMID:12711330 — V. vulnificus flg operon (bacterial flagella)\n[26] PMID:2680969 — Salmonella flg virulence gene\n[30] PMID:12732473 — Aeromonas flg operon\n\n**EXCLUDE (alt-locus products: FLG-AS1 lncRNA):**\n[51] PMID:35461393 — lncRNA FLG-AS1\n[85] PMID:38802144 — lncRNA FLG-AS1\n\n**EXCLUDE (symbol collision - other):**\n[48] PMID:31557504 — Bacillus flagellin (Flg) in plants\n[78] PMID:30270319 — fLG = fluorescent L-glucose analogue\n[98] PMID:41293278 — FLG = few-layer graphene\n[99] PMID:22392335 — Onconase FL-G zymogen (NMR)\n\n**EXCLUDE (FGFR1 from curated papers):**\nAll 30 curated papers are about FGFR1/FGF signaling, not filaggrin. EXCLUDE all.\n\n**Borderline — check more carefully:**\n- [12] PMID:17989887 — SPINK5/KLK7/FLG in AD — mentions FLG functional relevance established, but focus is genetic association. No direct mechanism. EXCLUDE (expression/association).\n- [22] PMID:18774391 — SPINK5/KLK7/FLG polymorphisms — genetic association. EXCLUDE.\n- [32] PMID:19416262 — Taiwanese FLG mutations in IV — genetic/population. EXCLUDE.\n- [37] PMID:25997159 — Korean FLG null mutations — genetic. EXCLUDE.\n- [41] PMID:19183181 — German IV, FLG mutations — genetic/phenotype. EXCLUDE.\n- [52] PMID:23290076 — FLG mutation frequency and filaggrin expression in IV — includes immunohistochemistry of protein expression. Borderline but no direct mechanism. EXCLUDE.\n- [62] PMID:32035937 — Raman spectroscopy, NMF, FLG genotype — association. EXCLUDE.\n\nNow extracting discoveries from KEPT papers:\n\n**[3] PMID:19349982** — Flg frameshift mutation (5303delA) in mice causes barrier defect; topical allergen application leads to cutaneous inflammatory infiltrates and enhanced allergen-specific IgE responses, demonstrating that antigen transfer through defective epidermal barrier is a key mechanism for sensitization.\n\n**[10] PMID:19958351** — C-terminal region of FLG is essential for proper processing of profilaggrin into filaggrin; mutations anywhere in FLG, including C-terminal imperfect repeats, cause significant reductions in profilaggrin/filaggrin in epidermis.\n\n**[21] PMID:19663875** — Novel FLG nonsense mutation p.Lys4021X in C-terminal incomplete repeat leads to remarkable reduction of filaggrin protein expression; demonstrates C-terminal region essential for proper profilaggrin processing. Immunohistochemistry and real-time RT-PCR.\n\n**[23] PMID:27793761** — FLG loss-of-function mutations in AD (FLG/WT) lead to increased arachidonic acid and 12-lipoxygenase metabolites in human epidermal equivalents; arachidonic acid treatment increases inflammatory cytokines; 12-HETE attenuates late differentiation markers. Establishes autocrine eicosanoid mechanism linking FLG mutation to inflammation and impaired differentiation.\n\n**[24] PMID:22103940** — FLG knockdown in human keratinocytes (3D skin model): impaired epidermal differentiation, increased LDH leakage and IL-6/IL-8 after SDS irritation, increased percutaneous absorption of lipophilic drugs.\n\n**[25] PMID:29866992** — Rhodiola crenulata root extract induces FLG and LOR upregulation in an AHR-OVOL1-dependent fashion in keratinocytes; IVL upregulation is AHR-dependent but OVOL1-independent. AHR→OVOL1→FLG axis demonstrated by AHR/OVOL1 knockdown.\n\n**[33] PMID:32504614** — Granzyme B (GzmB) proteolytically cleaves FLG and E-cadherin extracellularly, impairing epithelial barrier function; GzmB-/- mice show reduced dermatitis, and small-molecule GzmB inhibitor reduces disease severity. Mechanism: extracellular GzmB cleavage of FLG contributes to barrier dysfunction in AD.\n\n**[38] PMID:33865911** — IL-4 and IL-13 increase nuclear full-length IL-33 via MAPK/ERK pathway in keratinocytes; nuclear IL-33 functions as STAT3 transcription cofactor, increasing pSTAT3 binding to FLG promoter to inhibit FLG transcription; IL-33/pSTAT3 complex also reduces RUNX1, downregulating LOR, KRT1, KRT10.\n\n**[40] PMID:28928464** — GATA3 knockdown by shRNA reduces filaggrin mRNA in keratinocytes; GATA3 overexpression upregulates FLG and FLG2 mRNA. GATA3 acts as transcriptional regulator of filaggrin expression in keratinocytes.\n\n**[43] PMID:34293350** — IL-31 increases nuclear full-length IL-33 and pSTAT3 in keratinocytes; nuclear IL-33/pSTAT3 complex binds FLG promoter to inhibit transcription; reduces RUNX1, downregulating KRT1/KRT10.\n\n**[53] PMID:36893939** — CRISPR/Cas9 FLG knockout in N/TERT-2G keratinocytes: loss of structural proteins (involucrin, hornerin, keratin 2, TGase1), denser stratum corneum without basket weave, compromised barrier (increased TEWL, altered impedance); FLG reinstatement restores keratohyalin granules, FLG protein, and other epidermal proteins. Demonstrates FLG is causal for epidermal differentiation and barrier function and orchestrates expression of other epidermal proteins.\n\n**[54] PMID:36496196** — Flg-/- neonatal mice show increased skin CD4+ T cells and epidermal dye penetration; commensal-specific CD4+ T cells skewed toward effector rather than regulatory T cells; persists into adulthood as Th17-dominated response with increased susceptibility to imiquimod-induced inflammation.\n\n**[64] PMID:33894197** — FLG-deficient BALB/c mice (CRISPR-generated) show ichthyosis phenotype and barrier defect with facilitated percutaneous sensitization but do NOT develop spontaneous dermatitis or atopy; the atopy in flaky tail mice attributed to concurrent Tmem79 mutation. Whole-genome sequencing confirmed Tmem79matted co-mutation in atopic Flgft BALB/c congenics.\n\n**[75] PMID:38250727** — GSDMD (activated by Caspase1) inhibits FLG expression via HDAC1; HDAC1 reduces histone acetylation at FLG promoter to decrease FLG transcription; GSDMD blocks KCTD6-HDAC1 interaction, preventing HDAC1 degradation and maintaining HDAC1-mediated FLG repression. Co-IP, ChIP, dual-luciferase reporter assays.\n\n**[100] PMID:40713347** — Phenylalanine amide compound (Compound 8.1) promotes FLG expression via AHR activation in NHEKs; preferentially upregulates keratinocyte differentiation/barrier genes over CYP1A1; AHR-dependent (confirmed by AHR knockdown); structure-activity analysis separates barrier gene induction from xenobiotic metabolism.\n\n**[14] PMID:31509236** — IL-13 downregulates the OVOL1-FLG axis and upregulates periostin-IL-24 axis in skin; GWAS points to IL-13, OVOL1, FLG genes. Review article citing experimental data. Moderate mechanistic content (pathway description with supporting experimental basis in lesional skin context).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"A homozygous 1-bp deletion (5303delA) in the murine Flg gene (analogous to human FLG null mutations) causes epidermal barrier deficiency; topical allergen application to these mice produces cutaneous inflammatory infiltrates and enhanced allergen-specific IgE responses, establishing that antigen transfer through a defective filaggrin-deficient epidermal barrier is a key mechanistic step in cutaneous sensitization.\",\n      \"method\": \"Mouse genetics (spontaneous Flg mutant), topical allergen challenge, histology, allergen-specific antibody measurement\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function mouse model with defined mechanistic phenotype (barrier breach → sensitization), replicated concept across labs\",\n      \"pmids\": [\"19349982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The C-terminal region of filaggrin is essential for proper processing of profilaggrin into mature filaggrin peptides; FLG nonsense mutations located in C-terminal imperfect repeats (e.g., p.Lys4021X) cause remarkable reduction of filaggrin protein in the epidermis, demonstrating that no FLG mutation location shows genotype-phenotype correlation because all impair profilaggrin processing.\",\n      \"method\": \"Comprehensive FLG sequencing, immunohistochemical staining of profilaggrin/filaggrin in patient epidermis, real-time RT-PCR\",\n      \"journal\": \"The British journal of dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein expression analysis in patient skin with novel mutation; single lab with two orthogonal methods\",\n      \"pmids\": [\"19663875\", \"19958351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FLG loss-of-function mutations in atopic dermatitis keratinocytes lead to increased arachidonic acid and 12-lipoxygenase metabolites (12-HETE) in human epidermal equivalents; exogenous arachidonic acid increases inflammatory cytokine expression in control keratinocytes, while 12-HETE attenuates late epidermal differentiation markers, establishing an autocrine eicosanoid mechanism by which FLG mutations trigger both inflammation and impaired differentiation.\",\n      \"method\": \"Human epidermal equivalents from patient keratinocytes, lipidomic analysis, cytokine measurement, exogenous lipid mediator treatment\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — patient-derived skin equivalents with multiple orthogonal readouts; single lab\",\n      \"pmids\": [\"27793761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FLG knockdown in human keratinocytes assembled into 3D skin models causes impaired epidermal differentiation (histopathological changes), increased LDH leakage and IL-6/IL-8 release upon SDS irritation, and increased percutaneous absorption of lipophilic drugs, demonstrating that filaggrin deficiency directly causes barrier dysfunction and heightened susceptibility to irritants.\",\n      \"method\": \"siRNA knockdown, 3D organotypic skin model, histopathology, cytokine ELISA, percutaneous absorption assay\",\n      \"journal\": \"Alternatives to laboratory animals : ATLA\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with multiple functional readouts; single lab\",\n      \"pmids\": [\"22103940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rhodiola crenulata root extract upregulates FLG and loricrin (LOR) expression in keratinocytes through AHR activation in an OVOL1-dependent manner, while involucrin (IVL) upregulation is AHR-dependent but OVOL1-independent, defining an AHR→OVOL1→FLG regulatory axis for skin barrier gene expression.\",\n      \"method\": \"AHR and OVOL1 siRNA knockdown, qRT-PCR, keratinocyte culture with Rhodiola extract\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pathway dissected by genetic knockdown with gene-specific readouts; single lab\",\n      \"pmids\": [\"29866992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"IL-13 downregulates the OVOL1-FLG axis in keratinocytes (and upregulates the periostin-IL-24 axis), establishing that the dominant Th2 cytokine in atopic dermatitis lesional skin mechanistically suppresses filaggrin expression through OVOL1.\",\n      \"method\": \"Keratinocyte cytokine treatment, gene expression analysis, GWAS integration\",\n      \"journal\": \"Immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pathway placement supported by experimental and GWAS data; single lab review/synthesis\",\n      \"pmids\": [\"31509236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Granzyme B (GzmB), elevated in atopic dermatitis, proteolytically cleaves filaggrin (FLG) and E-cadherin extracellularly, directly impairing epidermal barrier function; GzmB-/- mice show significantly reduced inflammation, epidermal thickening, and lesion formation in an oxazolone dermatitis model, and a small-molecule GzmB inhibitor reduces disease severity.\",\n      \"method\": \"GzmB knockout mice, oxazolone model, topical GzmB inhibitor, in vitro cleavage assay\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic KO with defined phenotype plus in vitro cleavage assay identifying FLG as direct GzmB substrate; multiple orthogonal methods\",\n      \"pmids\": [\"32504614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-4 and IL-13 induce nuclear accumulation of full-length IL-33 in keratinocytes via MAPK/ERK signaling; nuclear IL-33 acts as a transcription cofactor of phosphorylated STAT3, increasing pSTAT3 binding to the FLG promoter and thereby inhibiting FLG transcription; the nuclear IL-33/pSTAT3 complex also reduces RUNX1 expression, downregulating loricrin, keratin 1, and keratin 10.\",\n      \"method\": \"Monolayer keratinocyte culture, living skin equivalents, MAPK/ERK inhibitors, ChIP (pSTAT3 binding to FLG promoter), co-immunoprecipitation, siRNA knockdown\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP demonstrating direct pSTAT3 binding to FLG promoter, Co-IP for complex, functional rescue; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"33865911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"IL-31 similarly increases nuclear full-length IL-33 and pSTAT3 in keratinocytes; the nuclear IL-33/pSTAT3 complex binds the FLG promoter to inhibit FLG transcription and reduces RUNX1 to downregulate keratin 1 and keratin 10, revealing a shared mechanism by which multiple Th2/pruritic cytokines converge on nuclear IL-33 to suppress filaggrin and epidermal differentiation.\",\n      \"method\": \"Monolayer keratinocyte culture, living skin equivalents, ChIP, Co-IP, siRNA knockdown\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP and Co-IP with functional validation; mechanistically replicates IL-4/IL-13 finding with IL-31 in same system\",\n      \"pmids\": [\"34293350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GATA3 is a transcriptional regulator of filaggrin expression in keratinocytes: GATA3 knockdown by shRNA significantly reduces FLG and FLG2 mRNA under atopic dermatitis-like conditions, while GATA3 overexpression restores and upregulates FLG and FLG2 expression.\",\n      \"method\": \"shRNA knockdown, overexpression, qRT-PCR in keratinocytes; immunohistochemistry in patient skin biopsies\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional genetic manipulation (KD and OE) with consistent FLG expression readout; single lab\",\n      \"pmids\": [\"28928464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CRISPR/Cas9 knockout of FLG in human N/TERT-2G keratinocytes causes loss of keratohyalin granules, reduction of multiple structural proteins (involucrin, hornerin, keratin 2, transglutaminase 1), denser stratum corneum lacking basket-weave architecture, and compromised epidermal barrier (increased TEWL, altered impedance); correction of FLG reinstates all these features, establishing that filaggrin is causally required for normal epidermal differentiation and orchestrates expression of other epidermal structural proteins.\",\n      \"method\": \"CRISPR/Cas9 knockout, human epidermal equivalents, immunohistochemistry, TEWL measurement, electrical impedance spectroscopy, FLG re-expression rescue\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — clean isogenic CRISPR KO with rescue, multiple functional readouts confirming causality\",\n      \"pmids\": [\"36893939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FLG-deficient neonatal mice show increased epidermal dye penetration and elevated skin CD4+ T cells; commensal bacteria (S. epidermidis)-specific CD4+ T cells are skewed toward effector rather than regulatory T cells in Flg-/- pups, and this Th17-biased response persists into adulthood, causing increased susceptibility to imiquimod-induced skin inflammation, establishing a mechanism by which FLG deficiency in neonatal skin shapes the long-term commensal-specific immune response.\",\n      \"method\": \"Flg-/- mouse model (C57BL/6), single-cell RNA sequencing, flow cytometry, engineered S. epidermidis 2W colonization, imiquimod challenge\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with scRNA-seq and flow cytometry; mechanistic link from FLG deficiency to specific immune cell skewing with functional consequence\",\n      \"pmids\": [\"36496196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FLG-deficient mice on pure BALB/c background (generated by CRISPR targeting) develop ichthyosis and a barrier defect with facilitated percutaneous sensitization but do NOT spontaneously develop dermatitis or systemic atopy; whole-genome sequencing revealed that previously reported atopy in Flgft/ft BALB/c mice was caused by a co-segregating homozygous Tmem79matted mutation, demonstrating that FLG deficiency alone lowers the sensitization threshold but does not cause atopy.\",\n      \"method\": \"CRISPR/Cas9 Flg knockout on BALB/c background, whole-genome sequencing, TEWL measurement, IgE assay, percutaneous sensitization\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isogenic CRISPR KO with whole-genome sequencing to resolve confounding mutation; clean mechanistic dissection\",\n      \"pmids\": [\"33894197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GSDMD (gasdermin D), activated by Caspase-1, inhibits FLG expression by stabilizing HDAC1: GSDMD blocks the interaction between KCTD6 (an E3 ligase adaptor) and HDAC1, preventing HDAC1 ubiquitin-mediated degradation; accumulated HDAC1 then reduces histone acetylation at the FLG promoter, repressing FLG transcription. This GSDMD→HDAC1→FLG axis links pyroptosis activation to epidermal barrier dysfunction in atopic dermatitis.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), dual-luciferase reporter assay, siRNA/overexpression, Western blot, immunohistochemistry in AD patient lesions\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP, Co-IP and reporter assay define mechanism; single lab\",\n      \"pmids\": [\"38250727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A phenylalanine amide compound (Compound 8.1) promotes FLG expression and other skin barrier-related genes in normal human epidermal keratinocytes through aryl hydrocarbon receptor (AHR) activation; AHR knockdown abolishes this effect; structure-activity analysis shows the compound preferentially activates keratinocyte differentiation genes while minimally inducing CYP1A1, suggesting dissociation of AHR-mediated barrier gene induction from xenobiotic toxicity pathways.\",\n      \"method\": \"NHEK culture, microarray gene expression profiling, AHR siRNA knockdown, structure-activity relationship analysis\",\n      \"journal\": \"Journal of pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — AHR knockdown validates pathway; microarray plus mechanistic follow-up; single lab\",\n      \"pmids\": [\"40713347\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Filaggrin (FLG) is a structural protein of the cornified envelope whose expression in terminally differentiating keratinocytes is transcriptionally regulated by AHR→OVOL1, GATA3, and repressed by Th2/pruritic cytokines (IL-4, IL-13, IL-31) via a nuclear IL-33/pSTAT3 complex that binds the FLG promoter, and by GSDMD-stabilized HDAC1 through histone deacetylation at the FLG promoter; FLG is causally required for formation of keratohyalin granules, stratum corneum architecture, and expression of other epidermal structural proteins (involucrin, hornerin, keratin 2, transglutaminase 1), while FLG deficiency lowers the barrier to percutaneous allergen sensitization (enabling cutaneous IgE responses) and skews neonatal commensal-specific CD4+ T cells toward Th17-effector fates, and mature filaggrin protein can be proteolytically cleaved extracellularly by granzyme B, further impairing barrier function in inflammatory skin disease.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"Filaggrin (FLG) is a master regulator of terminal keratinocyte differentiation and epidermal barrier integrity whose loss-of-function causes defective stratum corneum formation, increased transepidermal water loss, altered eicosanoid metabolism, skewed commensal-specific T-cell immunity, and facilitated percutaneous allergen sensitization leading to IgE responses [PMID:36893939, PMID:19349982, PMID:27793761, PMID:36496196]. FLG transcription is positively regulated by the AHR–OVOL1 axis and GATA3, and repressed by Th2 cytokines (IL-4, IL-13, IL-31) through a nuclear IL-33/pSTAT3 complex that binds the FLG promoter, as well as by a GSDMD–HDAC1 epigenetic pathway that reduces histone acetylation at the same locus [PMID:33865911, PMID:34293350, PMID:38250727, PMID:29866992, PMID:28928464]. FLG protein is additionally depleted post-translationally by extracellular granzyme B cleavage, compounding barrier dysfunction in inflamed skin [PMID:32504614]. Note: early literature used the symbol FLG for FGFR1; FGFR1/FLG is a transmembrane receptor tyrosine kinase for FGFs that autophosphorylates at Tyr-653 and Tyr-766 and recruits PLC-γ1 via pTyr-766 [PMID:2554327, PMID:1656221, PMID:8443592].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"The initial identity question for the FLG gene symbol was resolved: FLG encoded the cell-surface receptor tyrosine kinase for acidic FGF (now called FGFR1), establishing that this locus produces a signaling receptor rather than a structural protein.\",\n      \"evidence\": \"In vitro and in-cell kinase assays plus 125I-aFGF cross-linking and immunoprecipitation in transfected cells\",\n      \"pmids\": [\"2554327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling partners not yet identified\", \"Relationship to the distinct skin filaggrin gene not clarified at this stage\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"The mechanism of FGFR1/FLG signal transduction was advanced by mapping Tyr-766 as the autophosphorylation site that recruits PLC-γ1 via its SH2 domain, and Tyr-653 as the catalytic-domain activation-loop phosphosite, revealing how receptor activation is coupled to phospholipase signaling.\",\n      \"evidence\": \"Phosphopeptide sequencing by Edman degradation and mass spectrometry; SH2-domain fusion-protein binding assays\",\n      \"pmids\": [\"1656221\", \"8443592\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional signaling mediators bind other phosphosites was unresolved\", \"Structural basis of kinase activation by Tyr-653 phosphorylation not determined\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Alternative splicing of FGFR1/FLG was shown to produce functionally distinct isoforms (two- versus three-Ig-loop), with the shorter gamma isoform conferring anchorage-independent growth in the presence of autocrine FGFs, establishing splice-variant biology as a mechanism for oncogenic signaling diversity.\",\n      \"evidence\": \"cDNA cloning, splice analysis, domain-specific antibody mapping, and soft-agar transformation assays\",\n      \"pmids\": [\"1847058\", \"1312829\", \"1325449\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of each isoform in normal tissues not established\", \"Ligand-binding specificity differences between isoforms inferred but not directly measured by biophysical methods\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The skin filaggrin gene (now the standard FLG symbol) was established as essential for epidermal barrier function: a defined 1-bp deletion in mouse Flg caused filaggrin deficiency and, upon topical allergen challenge, enhanced percutaneous sensitization with IgE responses, answering whether barrier dysfunction alone suffices for allergic sensitization.\",\n      \"evidence\": \"Flaky-tail mouse (5303delA Flg mutation), topical ovalbumin challenge, allergen-specific IgE measurement, skin histology\",\n      \"pmids\": [\"19349982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether filaggrin loss affects immune cell programming independently of barrier breach was unknown\", \"Contribution of individual filaggrin repeats to barrier function not dissected\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A metabolic consequence of FLG deficiency was uncovered: FLG-mutant human epidermal equivalents accumulated arachidonic acid and 12-LOX metabolites that promoted inflammation and suppressed late differentiation, establishing an autocrine eicosanoid loop as an amplifying mechanism downstream of barrier loss.\",\n      \"evidence\": \"Lipid mediator profiling of genotyped human epidermal equivalents; exogenous arachidonic acid and 12-HETE treatment with cytokine and differentiation readouts\",\n      \"pmids\": [\"27793761\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether eicosanoid changes are primary or secondary to altered calcium or barrier was unclear\", \"In vivo relevance in human patients not directly demonstrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Transcriptional control of FLG was expanded: GATA3 was identified as a positive regulator of FLG and FLG2 in keratinocytes, and the AHR–OVOL1 axis was shown to drive FLG expression, providing the first defined transcription factor circuitry upstream of the FLG promoter.\",\n      \"evidence\": \"shRNA knockdown and overexpression of GATA3 in primary keratinocytes; AHR inhibition and OVOL1 knockdown in keratinocyte culture\",\n      \"pmids\": [\"28928464\", \"29866992\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct promoter binding by GATA3 not demonstrated by ChIP\", \"Interplay between GATA3 and OVOL1 pathways unexplored\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The mechanism by which Th2 cytokines silence FLG was resolved: IL-4, IL-13, and IL-31 each trigger formation of a nuclear IL-33/pSTAT3 complex that directly binds the FLG promoter to repress transcription, unifying three cytokine inputs into a single epigenetic switch.\",\n      \"evidence\": \"ChIP for pSTAT3 at the FLG promoter, siRNA/overexpression of IL-33 and STAT3, monolayer keratinocyte and living skin equivalent models\",\n      \"pmids\": [\"33865911\", \"34293350\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise cis-regulatory element(s) within the FLG promoter bound by IL-33/pSTAT3 not mapped at nucleotide resolution\", \"Whether IL-33/pSTAT3 recruits chromatin-modifying enzymes to the FLG locus was not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Post-translational destruction of filaggrin protein was identified: granzyme B cleaves FLG extracellularly, and GzmB knockout or pharmacological inhibition reduces inflammation in a contact dermatitis model, establishing a proteolytic mechanism for barrier compromise independent of transcriptional suppression.\",\n      \"evidence\": \"GzmB−/− mice and topical GzmB inhibitor in oxazolone dermatitis; substrate identification of FLG and E-cadherin\",\n      \"pmids\": [\"32504614\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific cleavage sites within filaggrin not mapped\", \"Relative contribution of GzmB-mediated FLG cleavage versus transcriptional downregulation in atopic dermatitis not quantified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"FLG deficiency was shown to skew neonatal commensal-specific immunity: Flg−/− mice develop Th17-biased rather than Treg responses to S. epidermidis during colonization, persisting into adulthood with heightened susceptibility to skin inflammation, answering whether barrier loss affects adaptive immune programming.\",\n      \"evidence\": \"Flg−/− neonatal mice colonized with engineered S. epidermidis; scRNA-seq and flow cytometry of skin T cells; imiquimod challenge\",\n      \"pmids\": [\"36496196\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the Th17 skewing is driven by increased antigen flux, altered cytokine milieu, or both was not resolved\", \"Relevance to human neonatal immune development not directly tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Isogenic CRISPR knockout and rescue in human keratinocytes definitively established FLG as a causal orchestrator of epidermal differentiation: FLG loss abolished keratohyalin granules, reduced involucrin/hornerin/KRT2/TGM1, disrupted stratum corneum architecture, and increased TEWL, all rescued by FLG re-expression.\",\n      \"evidence\": \"CRISPR/Cas9 FLG KO in N/TERT-2G keratinocytes, human epidermal equivalents, IHC, TEWL, electrical impedance, genetic rescue\",\n      \"pmids\": [\"36893939\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How filaggrin protein mechanistically controls expression of involucrin and other differentiation genes is unknown\", \"Whether filaggrin fragments (e.g. NMF amino acids) contribute independently to the differentiation phenotype was not dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"An additional repressive pathway was defined: activated GSDMD stabilizes HDAC1 by blocking KCTD6-mediated degradation, and HDAC1 then deacetylates histones at the FLG promoter to silence transcription, revealing an inflammasome–epigenetic axis that converges on the same locus targeted by IL-33/pSTAT3.\",\n      \"evidence\": \"Co-IP of GSDMD–HDAC1–KCTD6, ChIP for histone acetylation at FLG promoter, HDAC1 siRNA/OE, dual-luciferase reporter in human keratinocytes, AD patient IHC\",\n      \"pmids\": [\"38250727\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GSDMD–HDAC1 and IL-33/pSTAT3 pathways act synergistically or independently at the FLG promoter is untested\", \"In vivo validation of GSDMD-dependent FLG repression in animal models is lacking\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How filaggrin protein mechanistically controls downstream differentiation gene expression (involucrin, hornerin, TGM1, KRT2) and whether its breakdown products (NMF amino acids) have signaling or structural functions distinct from the intact polymer remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct molecular target or binding partner of processed filaggrin monomers identified\", \"Structural basis of filaggrin–keratin intermediate filament bundling not resolved at atomic level\", \"Integration of multiple transcriptional repression pathways (IL-33/pSTAT3, GSDMD/HDAC1) at the FLG locus not modeled in vivo\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [8, 17, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [13, 17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [17, 20]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"IL33\",\n      \"STAT3\",\n      \"OVOL1\",\n      \"GATA3\",\n      \"GSDMD\",\n      \"HDAC1\",\n      \"GZMB\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"Insufficient on-target evidence to synthesize a narrative — discovery timeline does not match the canonical FLG protein.\",\n  \"teleology\": [],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```"}