{"gene":"LRIG1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2004,"finding":"LRIG1 physically associates with all four ErbB/EGFR family receptors (EGFR, ErbB2, ErbB3, ErbB4) and promotes their ubiquitylation and degradation via recruitment of the E3 ubiquitin ligase c-Cbl, which simultaneously ubiquitylates both EGFR and LRIG1, sorting them for lysosomal degradation. LRIG1 transcript and protein are upregulated by EGF stimulation, establishing a negative feedback loop.","method":"Co-immunoprecipitation, ubiquitylation assays, protein degradation assays, c-Cbl recruitment assays in transfected cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal Co-IP, in vitro ubiquitylation assay, mechanistic dissection of c-Cbl recruitment; independently replicated in a concurrent JBC paper (PMID:15345710)","pmids":["15282549"],"is_preprint":false},{"year":2004,"finding":"LRIG1 forms a complex with each ErbB receptor independent of growth factor binding, suppresses cellular receptor levels, shortens receptor half-life, and enhances ligand-stimulated receptor ubiquitination, thereby suppressing EGF-stimulated transformation and cell cycle progression.","method":"Co-transfection in 293T cells, co-immunoprecipitation, receptor half-life assays, ubiquitination assays, NIH3T3 transformation assay, inducible expression in PC3 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, half-life, ubiquitination, functional transformation assay), replicates findings of concurrent EMBO paper (PMID:15282549)","pmids":["15345710"],"is_preprint":false},{"year":2006,"finding":"LRIG1 downregulation via siRNA increases cell-surface EGF receptor levels, enhances activation of downstream signaling pathways, and stimulates keratinocyte proliferation. LRIG1 also acts in part by negatively regulating the Myc promoter.","method":"siRNA knockdown, flow cytometry for cell-surface EGFR, downstream signaling assays, clonal growth analysis, promoter regulation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA loss-of-function with multiple orthogonal readouts (EGFR surface levels, signaling, proliferation, Myc promoter), single lab but multiple methods","pmids":["16877544"],"is_preprint":false},{"year":2006,"finding":"A soluble ectodomain of LRIG1 containing only the leucine-rich repeat (LRR) domain inhibits both ligand-independent and ligand-dependent EGFR activation and causes growth inhibition of EGFR-expressing carcinoma cells. High-affinity binding sites (Kd = 10 nM) for the soluble ectodomain exist on EGFR-expressing cells and can be competitively displaced by excess EGF, indicating binding at or near the EGF binding site.","method":"Recombinant protein treatment, cell growth assays, biosensor binding analysis, competitive displacement with EGF, EGFR activation assays, ERK1/2 signaling assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro binding assay with Kd determination, functional growth inhibition with mechanistic follow-up across multiple cell lines, single lab but multiple orthogonal methods","pmids":["16847455"],"is_preprint":false},{"year":2006,"finding":"LRIG1 is a novel negative regulator of the Met receptor tyrosine kinase. LRIG1 interacts with Met independent of HGF stimulation and destabilizes Met in a c-Cbl-independent manner. LRIG1 knockdown increases Met receptor half-life, and LRIG1 overexpression reduces endogenous Met in breast cancer cells and impairs HGF responsiveness. LRIG1 also opposes synergistic invasion driven by Met and ErbB2.","method":"Co-immunoprecipitation, receptor half-life assays, siRNA knockdown, overexpression in breast cancer cells, invasion assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, half-life assays, siRNA loss-of-function and overexpression gain-of-function, multiple orthogonal methods in single lab","pmids":["17178829"],"is_preprint":false},{"year":2008,"finding":"Lrig1 physically interacts with the Ret receptor tyrosine kinase, and this association inhibits GDNF binding to Ret, prevents Ret recruitment to lipid rafts, and suppresses Ret autophosphorylation and MAPK activation in response to GDNF. Lrig1 overexpression inhibits GDNF/Ret-induced neurite outgrowth, while Lrig1 siRNA knockdown potentiates neuronal differentiation and MAPK activation.","method":"Co-immunoprecipitation, GDNF binding assay, lipid raft fractionation, receptor autophosphorylation assays, MAPK activation assays, siRNA knockdown, neurite outgrowth assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, ligand binding inhibition, lipid raft fractionation, and siRNA/overexpression with functional readouts; multiple orthogonal methods in single lab","pmids":["18171921"],"is_preprint":false},{"year":2008,"finding":"LRIG1 protein levels are suppressed by ErbB receptor activation in breast tumor cells but not in normal breast epithelial cells, creating a feed-forward loop: aberrant ErbB2 signaling suppresses LRIG1, which in turn contributes to ErbB2 overexpression. RNAi knockdown of endogenous LRIG1 elevates ErbB2 and augments proliferation in ErbB2+ breast tumor cell lines.","method":"RNAi knockdown, ectopic LRIG1 expression, western blotting, ErbB receptor activation experiments, proliferation assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi and overexpression with mechanistic follow-up, but all from a single lab with no independent replication reported","pmids":["18922900"],"is_preprint":false},{"year":2008,"finding":"EGFRvIII, despite its extracellular deletion, retains interaction with LRIG1 and is more sensitive to LRIG1-mediated downregulation than wild-type EGFR. LRIG1 regulation of EGFRvIII is mechanistically distinct from c-Cbl-mediated degradation. RNAi-mediated silencing of LRIG1 alters EGFRvIII intracellular trafficking and leads to enhanced EGFRvIII expression.","method":"Co-immunoprecipitation, RNAi knockdown, receptor trafficking assays, proliferation/survival/motility/invasion assays in glioblastoma cells","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and RNAi with trafficking readouts; single lab, multiple methods","pmids":["18542056"],"is_preprint":false},{"year":2012,"finding":"Loss of Lrig1 in mice results in heightened ErbB1-3 expression and development of duodenal adenomas, establishing Lrig1 as an in vivo tumor suppressor functioning through ErbB regulation. Lrig1 marks predominantly noncycling intestinal stem cells at the crypt base that can replenish damaged crypts upon injury.","method":"Genetic knockout (Lrig1-CreERT2/CreERT2), lineage tracing, transcriptome profiling, immunohistochemistry","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic ablation with defined molecular phenotype (ErbB upregulation) and tumor formation; replicated by concurrent Wong et al. study","pmids":["22464327"],"is_preprint":false},{"year":2012,"finding":"Lrig1 controls the size of the intestinal stem cell niche by regulating the amplitude of ErbB growth factor signaling. Loss of Lrig1 leads to expansion of the intestinal stem cell compartment through increased ErbB-driven proliferation.","method":"Genetic knockout, intestinal organoid culture, ErbB signaling assays, immunostaining of intestinal crypts","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic ablation with specific ErbB pathway mechanistic readout; independent replication of Powell et al. findings","pmids":["22388892"],"is_preprint":false},{"year":2013,"finding":"LRIG1 regulates contact inhibition by forming a ternary complex with EGFR and E-cadherin, modulating EGFR activity in a contact-dependent manner. Deletion of Lrig1 is sufficient to promote murine airway hyperplasia through loss of contact inhibition.","method":"Co-immunoprecipitation (ternary complex), Lrig1 knockout mouse model, re-expression in human lung cancer cells, airway hyperplasia assay","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating ternary complex plus in vivo knockout phenotype; single lab","pmids":["23208928"],"is_preprint":false},{"year":2013,"finding":"LRIG1 inhibits STAT3-dependent inflammatory signaling in the cornea. Deletion of Lrig1 promotes a cell-fate switch from transparent epithelium to keratinized epidermis. Inhibition of STAT3 in Lrig1-/- mice rescues pathological phenotypes, placing LRIG1 upstream of STAT3 in corneal homeostasis. Bone marrow chimera experiments indicate LRIG1 also coordinates bone marrow-derived inflammatory cell function.","method":"Genetic knockout mouse model (Lrig1-/-), STAT3 inhibitor rescue experiments, transgenic STAT3-CA mice, bone marrow chimera experiments","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via inhibitor rescue plus multiple mouse models (knockout, transgenic, chimera) with specific molecular phenotype","pmids":["24316976"],"is_preprint":false},{"year":2013,"finding":"Lrig3 functionally opposes Lrig1: Lrig3 stabilizes ErbB receptors and counteracts Lrig1 negative regulatory activity, while Lrig1 destabilizes Lrig3 itself, identifying Lrig3 as a new target of Lrig1-mediated degradation.","method":"Co-expression studies, receptor stability assays, co-immunoprecipitation, ErbB receptor level measurement","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional co-expression assays with receptor stability readouts; single lab","pmids":["23723069"],"is_preprint":false},{"year":2014,"finding":"USP8 acts as a LRIG1-specific deubiquitinating enzyme: USP8 interacts with LRIG1 and stabilizes it by removing ubiquitin modifications. An anti-Met antibody (SAIT301) triggers LRIG1 ubiquitination by inhibiting the LRIG1-USP8 interaction, leading to LRIG1-mediated Met and LRIG1 co-degradation via lysosomal targeting through Hrs.","method":"Co-immunoprecipitation (USP8-LRIG1 interaction), ubiquitination assays, lysosomal trafficking assay, siRNA knockdown, anti-Met antibody treatment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for novel interaction, ubiquitination and trafficking mechanistic assays; single lab","pmids":["24828152"],"is_preprint":false},{"year":2015,"finding":"Crystal structures of the LRIG1 extracellular domain were determined at 2.3 Å resolution for the LRR domain and 3Ig domain. The LRR domain and LRR-1Ig fragment are monomers in solution, while the 3Ig domain is dimeric. Notably, no detectable direct binding of isolated LRIG1 ECD domains to EGFR was observed in solution or on the cell surface, and co-expression of full-length LRIG1 in HEK293 cells did not inhibit ligand-stimulated EGFR activation.","method":"X-ray crystallography (2.3 Å), biosensor binding analysis, size-exclusion chromatography, cell-surface binding assays, co-expression EGFR activation assay","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — crystal structure determination with rigorous negative binding result; negative finding is mechanistically informative but conflicts with other papers; single lab","pmids":["25765764"],"is_preprint":false},{"year":2015,"finding":"Lrig1 regulates the postnatal development of smooth muscle-derived subsets of interstitial cells of Cajal (ICC-DMP and ICC-SMP) in the intestine. Lineage tracing demonstrates that ICC-DMP and ICC-SMP arise from Lrig1-positive smooth muscle progenitors, and loss of Lrig1 results in loss of KIT, anoctamin-1, and neurokinin 1 receptor expression in these ICC populations and impaired intestinal transit.","method":"Lineage tracing (Lrig1-CreERT2 x Rosa26-LSL-YFP), Lrig1-null mouse model, immunofluorescence, intestinal transit assay","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic lineage tracing with defined molecular and functional phenotype; single lab with multiple orthogonal methods","pmids":["25921371"],"is_preprint":false},{"year":2016,"finding":"Lrig1 physically interacts with TrkB and attenuates BDNF signaling. Loss of Lrig1 enhances primary dendrite formation and proximal dendritic branching of hippocampal neurons, phenocopying BDNF effects. Lrig1-deficient mice display morphological changes in dendrite arborization and defects in social interaction.","method":"Co-immunoprecipitation (Lrig1-TrkB), gain- and loss-of-function in hippocampal neurons, in vivo knockout mouse behavioral analysis, dendritic morphology quantification","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP for physical interaction, multiple functional assays (gain/loss of function, in vivo knockout with behavioral and morphological phenotypes); single lab","pmids":["26935556"],"is_preprint":false},{"year":2019,"finding":"Androgen receptor (AR) directly transactivates LRIG1 by binding to multiple AR-binding sites in the LRIG1 locus. LRIG1 in turn dampens ERBB expression in a cell type-dependent manner and inhibits ERBB2-driven tumor growth, establishing LRIG1 as a pleiotropic AR-regulated feedback tumor suppressor.","method":"AR ChIP-seq, AR binding site mutagenesis, LRIG1 expression assays upon AR activation, xenograft tumor models (AR+ and AR-), Hi-Myc and TRAMP transgenic models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — ChIP demonstrating direct AR binding with multiple AR binding sites, functional in vivo tumor models; single lab with multiple orthogonal methods","pmids":["31792211"],"is_preprint":false},{"year":2021,"finding":"LRIG1 is a gatekeeper for neural stem cell (NSC) exit from quiescence. BMP-4 signaling induces dormant quiescence while combined BMP-4/FGF-2 induces a primed quiescent state with high LRIG1 levels. Mechanistically, LRIG1 enables EGFR protein levels to increase while limiting signaling activation, priming quiescent NSCs for cell cycle re-entry. Genetic disruption of Lrig1 in the SVZ leads to enhanced NSC proliferation.","method":"In vitro NSC culture, genetic Lrig1 disruption in vivo, single-cell analysis, EGFR protein and signaling assays, SVZ engraftment experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo genetic ablation with defined EGFR mechanistic readout, in vitro validation; single lab with multiple orthogonal methods","pmids":["33972529"],"is_preprint":false},{"year":2021,"finding":"LRIG1 is expressed on Ret-positive DRG neurons and cooperates with Lrig3 to inhibit GDNF/Ret signaling. Lrig3 also interacts with Ret and inhibits GDNF/Ret signaling. Single deletion of Lrig1 or Lrig3 does not promote axonal growth, but haploinsufficiency of Lrig1 on a Lrig3 mutant background significantly potentiates Ret signaling and axonal growth, demonstrating redundant genetic interaction.","method":"Genetic compound mutant mouse models, Co-immunoprecipitation (Lrig3-Ret), GDNF-stimulated signaling assays, axonal growth assays, behavioral testing","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in compound mutants plus Co-IP with functional readouts; replicates and extends Lrig1/Ret findings from PMID:18171921","pmids":["34338291"],"is_preprint":false},{"year":2023,"finding":"Lrig1 is required for the suppressive function of regulatory T cells (Tregs). Within CD4+ T cells, Tregs express the highest levels of Lrig1; Lrig1 deficiency impairs Treg suppressive function without affecting naïve T cell differentiation into other subsets. Mechanistically, Lrig1 controls suppressive function via the Smad2/3/Foxp3 axis. Adoptive transfer of CD4+Lrig1+ T cells alleviates autoimmune symptoms in colitis and lupus nephritis models.","method":"Lrig1-deficient mouse models, adoptive transfer experiments, Treg suppression assays, Smad2/3/Foxp3 pathway analysis, autoimmune disease models (EAE, colitis, lupus nephritis), anti-Lrig1 monoclonal antibody treatment","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with defined molecular pathway (Smad2/3/Foxp3), multiple in vivo disease models, adoptive transfer, and antibody intervention; single lab","pmids":["37666819"],"is_preprint":false},{"year":2024,"finding":"LRIG1 functions as an inhibitory immune checkpoint receptor by engaging VISTA (V-domain immunoglobulin suppressor of T cell activation) as a binding partner on CD8+ T cells, suppressing TCR signaling pathways. T cell-specific LRIG1 deletion leads to expansion of tumor-specific cytotoxic T cells with increased effector function.","method":"Co-immunoprecipitation/binding assays (LRIG1-VISTA interaction), T cell-specific conditional knockout mouse models, tumor models, TCR signaling assays, flow cytometry of T cell subsets","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct binding interaction identified, conditional knockout with defined signaling and functional phenotype; single study with multiple orthogonal methods","pmids":["38758807"],"is_preprint":false},{"year":2024,"finding":"LRIG1 binds to TGFβ/BMP receptors and the TGFβ1 ligand, and facilitates SMAD phosphorylation downstream. Loss of LRIG1 in adult neural stem cells impairs TGFβ and BMP signaling activation, causing hyperproliferation that is not solely attributable to EGFR activation.","method":"Co-immunoprecipitation (LRIG1-TGFβ/BMP receptors, LRIG1-TGFβ1 ligand), Lrig1 knockout mouse models, SMAD phosphorylation assays, EGFR and TGFβ/BMP signaling assays","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for novel receptor and ligand interactions with downstream signaling readouts; single lab","pmids":["38987622"],"is_preprint":false},{"year":2025,"finding":"Macrophage-derived VISTA interacts with LRIG1 in intestinal stem cells and suppresses PPARα signaling, leading to impeded intestinal organoid growth and increased epithelial damage. This VISTA/LRIG1 interaction hinders gut epithelial repair during colitis.","method":"Co-immunoprecipitation (macrophage VISTA-epithelial LRIG1), intestinal organoid growth assays, Vsir-/- and Vsir-/-Rag1-/- mouse models, macrophage transfer experiments, DSS colitis model","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for interaction plus multiple genetic mouse models and organoid functional assays; single lab","pmids":["40883589"],"is_preprint":false},{"year":2018,"finding":"A protein interaction network centered on LRIG1 was identified through yeast two-hybrid screening and BioPlex data mining. Functionally validated interactors that modulate LRIG1's ability to downregulate PDGFRα include RAB4A, PON2, GAL3ST1, ZBTB16, LRIG2, CNPY3, HLA-DRA, GML, CNPY4, LRRC40, LRIG3, GLRX3, and PTPRK. PON2 co-localizes with LRIG1 in LRIG1-transfected cells.","method":"Yeast two-hybrid screen, BioPlex data mining, triple co-transfection functional validation (HEK293 cells), co-localization by microscopy","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — yeast two-hybrid with functional validation by shRNA epistasis, co-localization; single lab, interactome screen with functional follow-up","pmids":["29317492"],"is_preprint":false},{"year":2002,"finding":"Targeted disruption of the Lig-1 (Lrig1) gene in mice results in psoriasiform epidermal hyperplasia, demonstrating that Lrig1 is required for normal epidermal proliferation control. Lrig1 is expressed in basal cells of the epidermis and outer root sheath cells of hair follicles.","method":"Gene targeting/knockout mouse model, histological analysis, in situ hybridization","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo gene knockout with specific epidermal phenotype; foundational loss-of-function study independently replicated in subsequent skin biology papers","pmids":["12067728"],"is_preprint":false},{"year":2022,"finding":"LRIG1 expression in basal/triple-negative breast cancer is silenced by CpG island promoter methylation. Global demethylation with 5-aza-2'-deoxycytidine restores LRIG1 expression in basal/triple-negative but not luminal cell lines. Targeted TET1-mediated demethylation and VP64-mediated transcriptional activation using CRISPR/dCas9 at the CpG island restores LRIG1 expression and reduces cancer cell viability.","method":"Methylation immunoprecipitation, 5-aza-2'-deoxycytidine treatment, CRISPR/dCas9-TET1 targeted demethylation, dCas9-VP64 transcriptional activation, RT-PCR, immunoblotting, viability assays","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — multiple epigenetic mechanism methods including targeted CRISPR demethylation; single lab with several orthogonal approaches","pmids":["35440669"],"is_preprint":false},{"year":2020,"finding":"LRIG1-mediated inhibition of EGFR controls neural precursor cell proliferation during cortical development. Loss of Lrig1 in cortical NSCs causes stem cell expansion due to increased proliferation via EGFR deregulation. LRIG1 associates with and negatively regulates EGFR in cortical NSCs.","method":"Co-immunoprecipitation (LRIG1-EGFR), constitutive and conditional Lrig1 knockout mice, stem cell expansion quantification, EGFR signaling assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP plus genetic knockout with defined EGFR mechanistic phenotype; single lab, multiple orthogonal methods","pmids":["33053360"],"is_preprint":false}],"current_model":"LRIG1 is a transmembrane negative feedback regulator of multiple receptor tyrosine kinases (all four ErbBs, Met, Ret, TrkB, PDGFRα) that promotes receptor ubiquitylation and lysosomal degradation primarily through c-Cbl recruitment; its own stability is regulated by the deubiquitinase USP8; in neural stem cells it also facilitates TGFβ/BMP-SMAD signaling by binding TGFβ receptors and ligand; it forms a ternary complex with EGFR and E-cadherin to mediate contact inhibition; it suppresses TCR signaling by engaging the immune checkpoint ligand VISTA on CD8+ T cells; it supports Treg suppressive function via the Smad2/3/Foxp3 axis; its expression is induced by EGF (feedback loop) and by androgen receptor, and is silenced in cancer by CpG island promoter methylation; collectively, these mechanisms underlie its roles as a stem cell quiescence regulator and tumor suppressor across multiple tissue types."},"narrative":{"mechanistic_narrative":"LRIG1 is a transmembrane negative-feedback regulator of receptor tyrosine kinase (RTK) signaling that enforces cellular quiescence and acts as a tumor suppressor across epithelial, neural, and immune tissues [PMID:15282549, PMID:22464327, PMID:12067728]. It physically associates with all four ErbB/EGFR-family receptors independent of ligand, shortens their half-life, and promotes their ubiquitylation and lysosomal degradation by recruiting the E3 ligase c-Cbl, which co-ubiquitylates both the receptor and LRIG1; EGF stimulation induces LRIG1, closing a negative-feedback loop [PMID:15282549, PMID:15345710]. This regulatory logic extends beyond ErbBs: LRIG1 binds and destabilizes Met (in a c-Cbl-independent manner) [PMID:17178829], suppresses GDNF/Ret signaling by blocking ligand binding and lipid-raft recruitment [PMID:18171921], attenuates BDNF/TrkB signaling [PMID:26935556], and downregulates PDGFRα through a validated interactor network [PMID:29317492]. LRIG1 protein stability is set by the deubiquitinase USP8, which removes ubiquitin and protects LRIG1 from co-degradation [PMID:24828152]. In vivo, loss of Lrig1 elevates ErbB receptors and expands stem/progenitor compartments, producing duodenal adenomas, intestinal stem-cell niche expansion, epidermal hyperplasia, and cortical and subventricular-zone neural stem-cell overproliferation [PMID:22464327, PMID:22388892, PMID:12067728, PMID:33053360, PMID:33972529]; in neural stem cells LRIG1 raises EGFR protein levels while restraining signaling to prime cells for cell-cycle re-entry, and also binds TGFβ/BMP receptors and TGFβ1 to facilitate SMAD phosphorylation [PMID:33972529, PMID:38987622]. LRIG1 additionally mediates contact inhibition via a ternary complex with EGFR and E-cadherin [PMID:23208928] and restrains STAT3-driven inflammation [PMID:24316976]. In the immune system it supports Treg suppressive function through the Smad2/3/Foxp3 axis [PMID:37666819] and acts as an inhibitory checkpoint receptor by engaging VISTA to suppress TCR signaling in CD8+ T cells [PMID:38758807]. LRIG1 expression is transactivated by androgen receptor [PMID:31792211] and silenced in basal/triple-negative breast cancer by CpG island promoter methylation [PMID:35440669].","teleology":[{"year":2002,"claim":"Established the first in vivo requirement for LRIG1 in proliferation control before any molecular mechanism was known, by showing its loss causes epidermal overgrowth.","evidence":"Targeted Lrig1 knockout mouse with histology and in situ hybridization","pmids":["12067728"],"confidence":"High","gaps":["No molecular target or pathway identified at this stage","Mechanism linking LRIG1 to keratinocyte proliferation undefined"]},{"year":2004,"claim":"Defined the core molecular mechanism: LRIG1 binds all ErbB receptors ligand-independently and drives their c-Cbl-dependent ubiquitylation and lysosomal degradation within an EGF-induced negative-feedback loop.","evidence":"Reciprocal Co-IP, in vitro ubiquitylation, half-life and transformation assays in transfected cells; two concurrent papers","pmids":["15282549","15345710"],"confidence":"High","gaps":["Endogenous physiological relevance not yet shown","Stoichiometry and structural basis of the LRIG1-ErbB-Cbl complex unresolved"]},{"year":2006,"claim":"Extended LRIG1 regulation to loss-of-function and to a secreted modality, showing endogenous LRIG1 limits surface EGFR and that a soluble LRR ectodomain binds EGFR-expressing cells with nanomolar affinity to inhibit signaling.","evidence":"siRNA knockdown with surface EGFR/Myc-promoter readouts; recombinant ectodomain binding (Kd ~10 nM) and growth inhibition assays","pmids":["16877544","16847455"],"confidence":"High","gaps":["Physiological source and role of a soluble ectodomain unclear","Direct vs indirect EGFR binding later disputed"]},{"year":2006,"claim":"Generalized LRIG1 beyond ErbBs by identifying Met as a target degraded through a c-Cbl-independent route, indicating multiple mechanistic modes.","evidence":"Co-IP, half-life, siRNA/overexpression and invasion assays in breast cancer cells","pmids":["17178829"],"confidence":"High","gaps":["Identity of the c-Cbl-independent degradation machinery for Met unknown"]},{"year":2008,"claim":"Broadened the RTK target repertoire to Ret and clarified a non-degradative mode, showing LRIG1 blocks GDNF binding and lipid-raft recruitment to suppress neuronal differentiation signaling.","evidence":"Co-IP, GDNF binding inhibition, lipid raft fractionation, siRNA/overexpression with neurite outgrowth in neurons","pmids":["18171921"],"confidence":"High","gaps":["Whether ligand-blocking applies to other RTK targets not tested","In vivo relevance addressed only later"]},{"year":2008,"claim":"Linked LRIG1 dysregulation to cancer feed-forward loops and trafficking, showing ErbB activation suppresses LRIG1 in tumor cells and that LRIG1 controls EGFRvIII via altered trafficking distinct from c-Cbl degradation.","evidence":"RNAi/overexpression in ErbB2+ breast and EGFRvIII+ glioblastoma cells with signaling, proliferation and trafficking readouts","pmids":["18922900","18542056"],"confidence":"Medium","gaps":["Single-lab studies without independent replication","Trafficking machinery for EGFRvIII regulation unidentified"]},{"year":2012,"claim":"Provided definitive in vivo proof of LRIG1 as an ErbB-restraining tumor suppressor and stem-cell quiescence marker, with loss expanding the intestinal stem-cell niche and producing adenomas.","evidence":"Lrig1-CreERT2 knockout, lineage tracing, organoids and transcriptomics; two concurrent studies","pmids":["22464327","22388892"],"confidence":"High","gaps":["Mechanism of LRIG1-marked stem cell quiescence beyond ErbB amplitude control incomplete"]},{"year":2013,"claim":"Diversified LRIG1's mechanisms into contact inhibition, anti-inflammatory control, and intra-family antagonism, via an EGFR/E-cadherin ternary complex, suppression of STAT3, and degradation of Lrig3.","evidence":"Co-IP, Lrig1 knockout mice, STAT3 inhibitor/transgenic rescue, and Lrig1/Lrig3 co-expression stability assays","pmids":["23208928","24316976","23723069"],"confidence":"Medium","gaps":["Single-lab findings for each mechanism","How LRIG1 connects to STAT3 mechanistically unclear"]},{"year":2014,"claim":"Identified the regulator of LRIG1's own stability, showing USP8 deubiquitinates and stabilizes LRIG1 and that disrupting this coupling triggers Met co-degradation.","evidence":"Co-IP, ubiquitination, Hrs-dependent lysosomal trafficking assays with anti-Met antibody","pmids":["24828152"],"confidence":"Medium","gaps":["Whether USP8 controls LRIG1 stability in physiological/in vivo contexts untested","Single-lab study"]},{"year":2015,"claim":"Provided structural data and a rigorous negative result, solving the LRIG1 ectodomain structures while failing to detect direct ECD-EGFR binding, challenging the simplest direct-inhibition model.","evidence":"X-ray crystallography (2.3 Å), SEC, biosensor and cell-surface binding, EGFR co-expression activation assay","pmids":["25765764"],"confidence":"Medium","gaps":["Conflicts with prior reports of direct ECD-EGFR binding","Conformation/co-factors required for functional binding undefined"]},{"year":2015,"claim":"Revealed a developmental, non-tumor lineage role, showing Lrig1+ smooth muscle progenitors give rise to interstitial cells of Cajal required for intestinal motility.","evidence":"Lineage tracing and Lrig1-null mice with immunofluorescence and transit assays","pmids":["25921371"],"confidence":"High","gaps":["Molecular mechanism by which LRIG1 directs ICC differentiation unknown"]},{"year":2016,"claim":"Added TrkB to the RTK targets with neurodevelopmental consequences, showing LRIG1 attenuates BDNF signaling and shapes dendritic arborization and social behavior.","evidence":"Co-IP, gain/loss-of-function in hippocampal neurons, Lrig1 knockout behavioral and morphological analysis","pmids":["26935556"],"confidence":"High","gaps":["Whether TrkB regulation uses degradation or ligand-blocking not resolved"]},{"year":2017,"claim":"(grouped with 2018) Defined a broad LRIG1 interactome and a PDGFRα target, identifying multiple validated modulators of LRIG1's downregulation activity.","evidence":"Yeast two-hybrid, BioPlex mining, triple co-transfection epistasis and co-localization in HEK293 cells","pmids":["29317492"],"confidence":"Medium","gaps":["Most interactors lack mechanistic detail on how they modulate LRIG1","In vivo relevance untested"]},{"year":2019,"claim":"Identified an upstream transcriptional driver, showing androgen receptor directly transactivates LRIG1 to suppress ERBB-driven tumor growth.","evidence":"AR ChIP-seq, binding-site mutagenesis, and AR+/AR- xenograft and transgenic tumor models","pmids":["31792211"],"confidence":"High","gaps":["Cell-type determinants of AR-LRIG1-ERBB output incompletely defined"]},{"year":2020,"claim":"Confirmed the EGFR-restraining quiescence mechanism in cortical neural stem cells, where LRIG1 loss expands the stem pool via EGFR deregulation.","evidence":"Co-IP and constitutive/conditional Lrig1 knockout mice with EGFR signaling readouts","pmids":["33053360"],"confidence":"High","gaps":["How LRIG1 selectively limits signaling while preserving receptor protein not fully explained"]},{"year":2021,"claim":"Refined the quiescence mechanism and extended Ret regulation, showing LRIG1 primes quiescent NSCs by raising EGFR levels while limiting activation, and that Lrig1/Lrig3 redundantly inhibit GDNF/Ret in DRG neurons.","evidence":"In vivo Lrig1 disruption and NSC culture with single-cell/EGFR readouts; compound Lrig1/Lrig3 mutant mice with Co-IP and axon-growth assays","pmids":["33972529","34338291"],"confidence":"High","gaps":["Biophysical basis for uncoupling EGFR abundance from signaling unresolved"]},{"year":2022,"claim":"Established epigenetic silencing of LRIG1 as a cancer mechanism, restoring expression and reducing viability via targeted CRISPR-based demethylation/activation.","evidence":"Methylation-IP, 5-aza treatment, dCas9-TET1 and dCas9-VP64 targeting in basal/triple-negative breast cancer lines","pmids":["35440669"],"confidence":"Medium","gaps":["In vivo therapeutic relevance untested","Single-lab study"]},{"year":2023,"claim":"Defined a non-RTK immune role, showing LRIG1 is required for Treg suppressive function through the Smad2/3/Foxp3 axis.","evidence":"Lrig1-deficient mice, adoptive transfer, suppression assays, and autoimmune disease models with antibody intervention","pmids":["37666819"],"confidence":"High","gaps":["Direct molecular link between LRIG1 and Smad2/3/Foxp3 not fully resolved","Single-lab study"]},{"year":2024,"claim":"Revealed two new ligand/receptor engagements: LRIG1 acts as an inhibitory checkpoint receptor binding VISTA to suppress TCR signaling, and binds TGFβ/BMP receptors and TGFβ1 to facilitate SMAD signaling in NSCs.","evidence":"Co-IP/binding assays, T-cell-specific conditional knockouts and 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Medical sciences = Hua zhong ke ji da xue xue bao. Yi xue Ying De wen ban = Huazhong keji daxue xuebao. 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LRIG1 transcript and protein are upregulated by EGF stimulation, establishing a negative feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assays, protein degradation assays, c-Cbl recruitment assays in transfected cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal Co-IP, in vitro ubiquitylation assay, mechanistic dissection of c-Cbl recruitment; independently replicated in a concurrent JBC paper (PMID:15345710)\",\n      \"pmids\": [\"15282549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LRIG1 forms a complex with each ErbB receptor independent of growth factor binding, suppresses cellular receptor levels, shortens receptor half-life, and enhances ligand-stimulated receptor ubiquitination, thereby suppressing EGF-stimulated transformation and cell cycle progression.\",\n      \"method\": \"Co-transfection in 293T cells, co-immunoprecipitation, receptor half-life assays, ubiquitination assays, NIH3T3 transformation assay, inducible expression in PC3 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, half-life, ubiquitination, functional transformation assay), replicates findings of concurrent EMBO paper (PMID:15282549)\",\n      \"pmids\": [\"15345710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LRIG1 downregulation via siRNA increases cell-surface EGF receptor levels, enhances activation of downstream signaling pathways, and stimulates keratinocyte proliferation. LRIG1 also acts in part by negatively regulating the Myc promoter.\",\n      \"method\": \"siRNA knockdown, flow cytometry for cell-surface EGFR, downstream signaling assays, clonal growth analysis, promoter regulation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA loss-of-function with multiple orthogonal readouts (EGFR surface levels, signaling, proliferation, Myc promoter), single lab but multiple methods\",\n      \"pmids\": [\"16877544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A soluble ectodomain of LRIG1 containing only the leucine-rich repeat (LRR) domain inhibits both ligand-independent and ligand-dependent EGFR activation and causes growth inhibition of EGFR-expressing carcinoma cells. High-affinity binding sites (Kd = 10 nM) for the soluble ectodomain exist on EGFR-expressing cells and can be competitively displaced by excess EGF, indicating binding at or near the EGF binding site.\",\n      \"method\": \"Recombinant protein treatment, cell growth assays, biosensor binding analysis, competitive displacement with EGF, EGFR activation assays, ERK1/2 signaling assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro binding assay with Kd determination, functional growth inhibition with mechanistic follow-up across multiple cell lines, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"16847455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LRIG1 is a novel negative regulator of the Met receptor tyrosine kinase. LRIG1 interacts with Met independent of HGF stimulation and destabilizes Met in a c-Cbl-independent manner. LRIG1 knockdown increases Met receptor half-life, and LRIG1 overexpression reduces endogenous Met in breast cancer cells and impairs HGF responsiveness. LRIG1 also opposes synergistic invasion driven by Met and ErbB2.\",\n      \"method\": \"Co-immunoprecipitation, receptor half-life assays, siRNA knockdown, overexpression in breast cancer cells, invasion assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, half-life assays, siRNA loss-of-function and overexpression gain-of-function, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"17178829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Lrig1 physically interacts with the Ret receptor tyrosine kinase, and this association inhibits GDNF binding to Ret, prevents Ret recruitment to lipid rafts, and suppresses Ret autophosphorylation and MAPK activation in response to GDNF. Lrig1 overexpression inhibits GDNF/Ret-induced neurite outgrowth, while Lrig1 siRNA knockdown potentiates neuronal differentiation and MAPK activation.\",\n      \"method\": \"Co-immunoprecipitation, GDNF binding assay, lipid raft fractionation, receptor autophosphorylation assays, MAPK activation assays, siRNA knockdown, neurite outgrowth assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ligand binding inhibition, lipid raft fractionation, and siRNA/overexpression with functional readouts; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"18171921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"LRIG1 protein levels are suppressed by ErbB receptor activation in breast tumor cells but not in normal breast epithelial cells, creating a feed-forward loop: aberrant ErbB2 signaling suppresses LRIG1, which in turn contributes to ErbB2 overexpression. RNAi knockdown of endogenous LRIG1 elevates ErbB2 and augments proliferation in ErbB2+ breast tumor cell lines.\",\n      \"method\": \"RNAi knockdown, ectopic LRIG1 expression, western blotting, ErbB receptor activation experiments, proliferation assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi and overexpression with mechanistic follow-up, but all from a single lab with no independent replication reported\",\n      \"pmids\": [\"18922900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"EGFRvIII, despite its extracellular deletion, retains interaction with LRIG1 and is more sensitive to LRIG1-mediated downregulation than wild-type EGFR. LRIG1 regulation of EGFRvIII is mechanistically distinct from c-Cbl-mediated degradation. RNAi-mediated silencing of LRIG1 alters EGFRvIII intracellular trafficking and leads to enhanced EGFRvIII expression.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, receptor trafficking assays, proliferation/survival/motility/invasion assays in glioblastoma cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and RNAi with trafficking readouts; single lab, multiple methods\",\n      \"pmids\": [\"18542056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss of Lrig1 in mice results in heightened ErbB1-3 expression and development of duodenal adenomas, establishing Lrig1 as an in vivo tumor suppressor functioning through ErbB regulation. Lrig1 marks predominantly noncycling intestinal stem cells at the crypt base that can replenish damaged crypts upon injury.\",\n      \"method\": \"Genetic knockout (Lrig1-CreERT2/CreERT2), lineage tracing, transcriptome profiling, immunohistochemistry\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic ablation with defined molecular phenotype (ErbB upregulation) and tumor formation; replicated by concurrent Wong et al. study\",\n      \"pmids\": [\"22464327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Lrig1 controls the size of the intestinal stem cell niche by regulating the amplitude of ErbB growth factor signaling. Loss of Lrig1 leads to expansion of the intestinal stem cell compartment through increased ErbB-driven proliferation.\",\n      \"method\": \"Genetic knockout, intestinal organoid culture, ErbB signaling assays, immunostaining of intestinal crypts\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic ablation with specific ErbB pathway mechanistic readout; independent replication of Powell et al. findings\",\n      \"pmids\": [\"22388892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LRIG1 regulates contact inhibition by forming a ternary complex with EGFR and E-cadherin, modulating EGFR activity in a contact-dependent manner. Deletion of Lrig1 is sufficient to promote murine airway hyperplasia through loss of contact inhibition.\",\n      \"method\": \"Co-immunoprecipitation (ternary complex), Lrig1 knockout mouse model, re-expression in human lung cancer cells, airway hyperplasia assay\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating ternary complex plus in vivo knockout phenotype; single lab\",\n      \"pmids\": [\"23208928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LRIG1 inhibits STAT3-dependent inflammatory signaling in the cornea. Deletion of Lrig1 promotes a cell-fate switch from transparent epithelium to keratinized epidermis. Inhibition of STAT3 in Lrig1-/- mice rescues pathological phenotypes, placing LRIG1 upstream of STAT3 in corneal homeostasis. Bone marrow chimera experiments indicate LRIG1 also coordinates bone marrow-derived inflammatory cell function.\",\n      \"method\": \"Genetic knockout mouse model (Lrig1-/-), STAT3 inhibitor rescue experiments, transgenic STAT3-CA mice, bone marrow chimera experiments\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via inhibitor rescue plus multiple mouse models (knockout, transgenic, chimera) with specific molecular phenotype\",\n      \"pmids\": [\"24316976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Lrig3 functionally opposes Lrig1: Lrig3 stabilizes ErbB receptors and counteracts Lrig1 negative regulatory activity, while Lrig1 destabilizes Lrig3 itself, identifying Lrig3 as a new target of Lrig1-mediated degradation.\",\n      \"method\": \"Co-expression studies, receptor stability assays, co-immunoprecipitation, ErbB receptor level measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional co-expression assays with receptor stability readouts; single lab\",\n      \"pmids\": [\"23723069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"USP8 acts as a LRIG1-specific deubiquitinating enzyme: USP8 interacts with LRIG1 and stabilizes it by removing ubiquitin modifications. An anti-Met antibody (SAIT301) triggers LRIG1 ubiquitination by inhibiting the LRIG1-USP8 interaction, leading to LRIG1-mediated Met and LRIG1 co-degradation via lysosomal targeting through Hrs.\",\n      \"method\": \"Co-immunoprecipitation (USP8-LRIG1 interaction), ubiquitination assays, lysosomal trafficking assay, siRNA knockdown, anti-Met antibody treatment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for novel interaction, ubiquitination and trafficking mechanistic assays; single lab\",\n      \"pmids\": [\"24828152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structures of the LRIG1 extracellular domain were determined at 2.3 Å resolution for the LRR domain and 3Ig domain. The LRR domain and LRR-1Ig fragment are monomers in solution, while the 3Ig domain is dimeric. Notably, no detectable direct binding of isolated LRIG1 ECD domains to EGFR was observed in solution or on the cell surface, and co-expression of full-length LRIG1 in HEK293 cells did not inhibit ligand-stimulated EGFR activation.\",\n      \"method\": \"X-ray crystallography (2.3 Å), biosensor binding analysis, size-exclusion chromatography, cell-surface binding assays, co-expression EGFR activation assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure determination with rigorous negative binding result; negative finding is mechanistically informative but conflicts with other papers; single lab\",\n      \"pmids\": [\"25765764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Lrig1 regulates the postnatal development of smooth muscle-derived subsets of interstitial cells of Cajal (ICC-DMP and ICC-SMP) in the intestine. Lineage tracing demonstrates that ICC-DMP and ICC-SMP arise from Lrig1-positive smooth muscle progenitors, and loss of Lrig1 results in loss of KIT, anoctamin-1, and neurokinin 1 receptor expression in these ICC populations and impaired intestinal transit.\",\n      \"method\": \"Lineage tracing (Lrig1-CreERT2 x Rosa26-LSL-YFP), Lrig1-null mouse model, immunofluorescence, intestinal transit assay\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic lineage tracing with defined molecular and functional phenotype; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25921371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Lrig1 physically interacts with TrkB and attenuates BDNF signaling. Loss of Lrig1 enhances primary dendrite formation and proximal dendritic branching of hippocampal neurons, phenocopying BDNF effects. Lrig1-deficient mice display morphological changes in dendrite arborization and defects in social interaction.\",\n      \"method\": \"Co-immunoprecipitation (Lrig1-TrkB), gain- and loss-of-function in hippocampal neurons, in vivo knockout mouse behavioral analysis, dendritic morphology quantification\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for physical interaction, multiple functional assays (gain/loss of function, in vivo knockout with behavioral and morphological phenotypes); single lab\",\n      \"pmids\": [\"26935556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Androgen receptor (AR) directly transactivates LRIG1 by binding to multiple AR-binding sites in the LRIG1 locus. LRIG1 in turn dampens ERBB expression in a cell type-dependent manner and inhibits ERBB2-driven tumor growth, establishing LRIG1 as a pleiotropic AR-regulated feedback tumor suppressor.\",\n      \"method\": \"AR ChIP-seq, AR binding site mutagenesis, LRIG1 expression assays upon AR activation, xenograft tumor models (AR+ and AR-), Hi-Myc and TRAMP transgenic models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — ChIP demonstrating direct AR binding with multiple AR binding sites, functional in vivo tumor models; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"31792211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LRIG1 is a gatekeeper for neural stem cell (NSC) exit from quiescence. BMP-4 signaling induces dormant quiescence while combined BMP-4/FGF-2 induces a primed quiescent state with high LRIG1 levels. Mechanistically, LRIG1 enables EGFR protein levels to increase while limiting signaling activation, priming quiescent NSCs for cell cycle re-entry. Genetic disruption of Lrig1 in the SVZ leads to enhanced NSC proliferation.\",\n      \"method\": \"In vitro NSC culture, genetic Lrig1 disruption in vivo, single-cell analysis, EGFR protein and signaling assays, SVZ engraftment experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic ablation with defined EGFR mechanistic readout, in vitro validation; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33972529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LRIG1 is expressed on Ret-positive DRG neurons and cooperates with Lrig3 to inhibit GDNF/Ret signaling. Lrig3 also interacts with Ret and inhibits GDNF/Ret signaling. Single deletion of Lrig1 or Lrig3 does not promote axonal growth, but haploinsufficiency of Lrig1 on a Lrig3 mutant background significantly potentiates Ret signaling and axonal growth, demonstrating redundant genetic interaction.\",\n      \"method\": \"Genetic compound mutant mouse models, Co-immunoprecipitation (Lrig3-Ret), GDNF-stimulated signaling assays, axonal growth assays, behavioral testing\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in compound mutants plus Co-IP with functional readouts; replicates and extends Lrig1/Ret findings from PMID:18171921\",\n      \"pmids\": [\"34338291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Lrig1 is required for the suppressive function of regulatory T cells (Tregs). Within CD4+ T cells, Tregs express the highest levels of Lrig1; Lrig1 deficiency impairs Treg suppressive function without affecting naïve T cell differentiation into other subsets. Mechanistically, Lrig1 controls suppressive function via the Smad2/3/Foxp3 axis. Adoptive transfer of CD4+Lrig1+ T cells alleviates autoimmune symptoms in colitis and lupus nephritis models.\",\n      \"method\": \"Lrig1-deficient mouse models, adoptive transfer experiments, Treg suppression assays, Smad2/3/Foxp3 pathway analysis, autoimmune disease models (EAE, colitis, lupus nephritis), anti-Lrig1 monoclonal antibody treatment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with defined molecular pathway (Smad2/3/Foxp3), multiple in vivo disease models, adoptive transfer, and antibody intervention; single lab\",\n      \"pmids\": [\"37666819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LRIG1 functions as an inhibitory immune checkpoint receptor by engaging VISTA (V-domain immunoglobulin suppressor of T cell activation) as a binding partner on CD8+ T cells, suppressing TCR signaling pathways. T cell-specific LRIG1 deletion leads to expansion of tumor-specific cytotoxic T cells with increased effector function.\",\n      \"method\": \"Co-immunoprecipitation/binding assays (LRIG1-VISTA interaction), T cell-specific conditional knockout mouse models, tumor models, TCR signaling assays, flow cytometry of T cell subsets\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding interaction identified, conditional knockout with defined signaling and functional phenotype; single study with multiple orthogonal methods\",\n      \"pmids\": [\"38758807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LRIG1 binds to TGFβ/BMP receptors and the TGFβ1 ligand, and facilitates SMAD phosphorylation downstream. Loss of LRIG1 in adult neural stem cells impairs TGFβ and BMP signaling activation, causing hyperproliferation that is not solely attributable to EGFR activation.\",\n      \"method\": \"Co-immunoprecipitation (LRIG1-TGFβ/BMP receptors, LRIG1-TGFβ1 ligand), Lrig1 knockout mouse models, SMAD phosphorylation assays, EGFR and TGFβ/BMP signaling assays\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for novel receptor and ligand interactions with downstream signaling readouts; single lab\",\n      \"pmids\": [\"38987622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Macrophage-derived VISTA interacts with LRIG1 in intestinal stem cells and suppresses PPARα signaling, leading to impeded intestinal organoid growth and increased epithelial damage. This VISTA/LRIG1 interaction hinders gut epithelial repair during colitis.\",\n      \"method\": \"Co-immunoprecipitation (macrophage VISTA-epithelial LRIG1), intestinal organoid growth assays, Vsir-/- and Vsir-/-Rag1-/- mouse models, macrophage transfer experiments, DSS colitis model\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for interaction plus multiple genetic mouse models and organoid functional assays; single lab\",\n      \"pmids\": [\"40883589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A protein interaction network centered on LRIG1 was identified through yeast two-hybrid screening and BioPlex data mining. Functionally validated interactors that modulate LRIG1's ability to downregulate PDGFRα include RAB4A, PON2, GAL3ST1, ZBTB16, LRIG2, CNPY3, HLA-DRA, GML, CNPY4, LRRC40, LRIG3, GLRX3, and PTPRK. PON2 co-localizes with LRIG1 in LRIG1-transfected cells.\",\n      \"method\": \"Yeast two-hybrid screen, BioPlex data mining, triple co-transfection functional validation (HEK293 cells), co-localization by microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — yeast two-hybrid with functional validation by shRNA epistasis, co-localization; single lab, interactome screen with functional follow-up\",\n      \"pmids\": [\"29317492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Targeted disruption of the Lig-1 (Lrig1) gene in mice results in psoriasiform epidermal hyperplasia, demonstrating that Lrig1 is required for normal epidermal proliferation control. Lrig1 is expressed in basal cells of the epidermis and outer root sheath cells of hair follicles.\",\n      \"method\": \"Gene targeting/knockout mouse model, histological analysis, in situ hybridization\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo gene knockout with specific epidermal phenotype; foundational loss-of-function study independently replicated in subsequent skin biology papers\",\n      \"pmids\": [\"12067728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LRIG1 expression in basal/triple-negative breast cancer is silenced by CpG island promoter methylation. Global demethylation with 5-aza-2'-deoxycytidine restores LRIG1 expression in basal/triple-negative but not luminal cell lines. Targeted TET1-mediated demethylation and VP64-mediated transcriptional activation using CRISPR/dCas9 at the CpG island restores LRIG1 expression and reduces cancer cell viability.\",\n      \"method\": \"Methylation immunoprecipitation, 5-aza-2'-deoxycytidine treatment, CRISPR/dCas9-TET1 targeted demethylation, dCas9-VP64 transcriptional activation, RT-PCR, immunoblotting, viability assays\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple epigenetic mechanism methods including targeted CRISPR demethylation; single lab with several orthogonal approaches\",\n      \"pmids\": [\"35440669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LRIG1-mediated inhibition of EGFR controls neural precursor cell proliferation during cortical development. Loss of Lrig1 in cortical NSCs causes stem cell expansion due to increased proliferation via EGFR deregulation. LRIG1 associates with and negatively regulates EGFR in cortical NSCs.\",\n      \"method\": \"Co-immunoprecipitation (LRIG1-EGFR), constitutive and conditional Lrig1 knockout mice, stem cell expansion quantification, EGFR signaling assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus genetic knockout with defined EGFR mechanistic phenotype; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"33053360\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LRIG1 is a transmembrane negative feedback regulator of multiple receptor tyrosine kinases (all four ErbBs, Met, Ret, TrkB, PDGFRα) that promotes receptor ubiquitylation and lysosomal degradation primarily through c-Cbl recruitment; its own stability is regulated by the deubiquitinase USP8; in neural stem cells it also facilitates TGFβ/BMP-SMAD signaling by binding TGFβ receptors and ligand; it forms a ternary complex with EGFR and E-cadherin to mediate contact inhibition; it suppresses TCR signaling by engaging the immune checkpoint ligand VISTA on CD8+ T cells; it supports Treg suppressive function via the Smad2/3/Foxp3 axis; its expression is induced by EGF (feedback loop) and by androgen receptor, and is silenced in cancer by CpG island promoter methylation; collectively, these mechanisms underlie its roles as a stem cell quiescence regulator and tumor suppressor across multiple tissue types.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LRIG1 is a transmembrane negative-feedback regulator of receptor tyrosine kinase (RTK) signaling that enforces cellular quiescence and acts as a tumor suppressor across epithelial, neural, and immune tissues [#0, #8, #25]. It physically associates with all four ErbB/EGFR-family receptors independent of ligand, shortens their half-life, and promotes their ubiquitylation and lysosomal degradation by recruiting the E3 ligase c-Cbl, which co-ubiquitylates both the receptor and LRIG1; EGF stimulation induces LRIG1, closing a negative-feedback loop [#0, #1]. This regulatory logic extends beyond ErbBs: LRIG1 binds and destabilizes Met (in a c-Cbl-independent manner) [#4], suppresses GDNF/Ret signaling by blocking ligand binding and lipid-raft recruitment [#5], attenuates BDNF/TrkB signaling [#16], and downregulates PDGFR\\u03b1 through a validated interactor network [#24]. LRIG1 protein stability is set by the deubiquitinase USP8, which removes ubiquitin and protects LRIG1 from co-degradation [#13]. In vivo, loss of Lrig1 elevates ErbB receptors and expands stem/progenitor compartments, producing duodenal adenomas, intestinal stem-cell niche expansion, epidermal hyperplasia, and cortical and subventricular-zone neural stem-cell overproliferation [#8, #9, #25, #27, #18]; in neural stem cells LRIG1 raises EGFR protein levels while restraining signaling to prime cells for cell-cycle re-entry, and also binds TGF\\u03b2/BMP receptors and TGF\\u03b21 to facilitate SMAD phosphorylation [#18, #22]. LRIG1 additionally mediates contact inhibition via a ternary complex with EGFR and E-cadherin [#10] and restrains STAT3-driven inflammation [#11]. In the immune system it supports Treg suppressive function through the Smad2/3/Foxp3 axis [#20] and acts as an inhibitory checkpoint receptor by engaging VISTA to suppress TCR signaling in CD8+ T cells [#21]. LRIG1 expression is transactivated by androgen receptor [#17] and silenced in basal/triple-negative breast cancer by CpG island promoter methylation [#26].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the first in vivo requirement for LRIG1 in proliferation control before any molecular mechanism was known, by showing its loss causes epidermal overgrowth.\",\n      \"evidence\": \"Targeted Lrig1 knockout mouse with histology and in situ hybridization\",\n      \"pmids\": [\"12067728\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No molecular target or pathway identified at this stage\", \"Mechanism linking LRIG1 to keratinocyte proliferation undefined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the core molecular mechanism: LRIG1 binds all ErbB receptors ligand-independently and drives their c-Cbl-dependent ubiquitylation and lysosomal degradation within an EGF-induced negative-feedback loop.\",\n      \"evidence\": \"Reciprocal Co-IP, in vitro ubiquitylation, half-life and transformation assays in transfected cells; two concurrent papers\",\n      \"pmids\": [\"15282549\", \"15345710\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous physiological relevance not yet shown\", \"Stoichiometry and structural basis of the LRIG1-ErbB-Cbl complex unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extended LRIG1 regulation to loss-of-function and to a secreted modality, showing endogenous LRIG1 limits surface EGFR and that a soluble LRR ectodomain binds EGFR-expressing cells with nanomolar affinity to inhibit signaling.\",\n      \"evidence\": \"siRNA knockdown with surface EGFR/Myc-promoter readouts; recombinant ectodomain binding (Kd ~10 nM) and growth inhibition assays\",\n      \"pmids\": [\"16877544\", \"16847455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological source and role of a soluble ectodomain unclear\", \"Direct vs indirect EGFR binding later disputed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Generalized LRIG1 beyond ErbBs by identifying Met as a target degraded through a c-Cbl-independent route, indicating multiple mechanistic modes.\",\n      \"evidence\": \"Co-IP, half-life, siRNA/overexpression and invasion assays in breast cancer cells\",\n      \"pmids\": [\"17178829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the c-Cbl-independent degradation machinery for Met unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Broadened the RTK target repertoire to Ret and clarified a non-degradative mode, showing LRIG1 blocks GDNF binding and lipid-raft recruitment to suppress neuronal differentiation signaling.\",\n      \"evidence\": \"Co-IP, GDNF binding inhibition, lipid raft fractionation, siRNA/overexpression with neurite outgrowth in neurons\",\n      \"pmids\": [\"18171921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ligand-blocking applies to other RTK targets not tested\", \"In vivo relevance addressed only later\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked LRIG1 dysregulation to cancer feed-forward loops and trafficking, showing ErbB activation suppresses LRIG1 in tumor cells and that LRIG1 controls EGFRvIII via altered trafficking distinct from c-Cbl degradation.\",\n      \"evidence\": \"RNAi/overexpression in ErbB2+ breast and EGFRvIII+ glioblastoma cells with signaling, proliferation and trafficking readouts\",\n      \"pmids\": [\"18922900\", \"18542056\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab studies without independent replication\", \"Trafficking machinery for EGFRvIII regulation unidentified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided definitive in vivo proof of LRIG1 as an ErbB-restraining tumor suppressor and stem-cell quiescence marker, with loss expanding the intestinal stem-cell niche and producing adenomas.\",\n      \"evidence\": \"Lrig1-CreERT2 knockout, lineage tracing, organoids and transcriptomics; two concurrent studies\",\n      \"pmids\": [\"22464327\", \"22388892\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of LRIG1-marked stem cell quiescence beyond ErbB amplitude control incomplete\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Diversified LRIG1's mechanisms into contact inhibition, anti-inflammatory control, and intra-family antagonism, via an EGFR/E-cadherin ternary complex, suppression of STAT3, and degradation of Lrig3.\",\n      \"evidence\": \"Co-IP, Lrig1 knockout mice, STAT3 inhibitor/transgenic rescue, and Lrig1/Lrig3 co-expression stability assays\",\n      \"pmids\": [\"23208928\", \"24316976\", \"23723069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings for each mechanism\", \"How LRIG1 connects to STAT3 mechanistically unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified the regulator of LRIG1's own stability, showing USP8 deubiquitinates and stabilizes LRIG1 and that disrupting this coupling triggers Met co-degradation.\",\n      \"evidence\": \"Co-IP, ubiquitination, Hrs-dependent lysosomal trafficking assays with anti-Met antibody\",\n      \"pmids\": [\"24828152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether USP8 controls LRIG1 stability in physiological/in vivo contexts untested\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided structural data and a rigorous negative result, solving the LRIG1 ectodomain structures while failing to detect direct ECD-EGFR binding, challenging the simplest direct-inhibition model.\",\n      \"evidence\": \"X-ray crystallography (2.3 \\u00c5), SEC, biosensor and cell-surface binding, EGFR co-expression activation assay\",\n      \"pmids\": [\"25765764\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conflicts with prior reports of direct ECD-EGFR binding\", \"Conformation/co-factors required for functional binding undefined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed a developmental, non-tumor lineage role, showing Lrig1+ smooth muscle progenitors give rise to interstitial cells of Cajal required for intestinal motility.\",\n      \"evidence\": \"Lineage tracing and Lrig1-null mice with immunofluorescence and transit assays\",\n      \"pmids\": [\"25921371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which LRIG1 directs ICC differentiation unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Added TrkB to the RTK targets with neurodevelopmental consequences, showing LRIG1 attenuates BDNF signaling and shapes dendritic arborization and social behavior.\",\n      \"evidence\": \"Co-IP, gain/loss-of-function in hippocampal neurons, Lrig1 knockout behavioral and morphological analysis\",\n      \"pmids\": [\"26935556\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TrkB regulation uses degradation or ligand-blocking not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"(grouped with 2018) Defined a broad LRIG1 interactome and a PDGFR\\u03b1 target, identifying multiple validated modulators of LRIG1's downregulation activity.\",\n      \"evidence\": \"Yeast two-hybrid, BioPlex mining, triple co-transfection epistasis and co-localization in HEK293 cells\",\n      \"pmids\": [\"29317492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Most interactors lack mechanistic detail on how they modulate LRIG1\", \"In vivo relevance untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an upstream transcriptional driver, showing androgen receptor directly transactivates LRIG1 to suppress ERBB-driven tumor growth.\",\n      \"evidence\": \"AR ChIP-seq, binding-site mutagenesis, and AR+/AR- xenograft and transgenic tumor models\",\n      \"pmids\": [\"31792211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type determinants of AR-LRIG1-ERBB output incompletely defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Confirmed the EGFR-restraining quiescence mechanism in cortical neural stem cells, where LRIG1 loss expands the stem pool via EGFR deregulation.\",\n      \"evidence\": \"Co-IP and constitutive/conditional Lrig1 knockout mice with EGFR signaling readouts\",\n      \"pmids\": [\"33053360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LRIG1 selectively limits signaling while preserving receptor protein not fully explained\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Refined the quiescence mechanism and extended Ret regulation, showing LRIG1 primes quiescent NSCs by raising EGFR levels while limiting activation, and that Lrig1/Lrig3 redundantly inhibit GDNF/Ret in DRG neurons.\",\n      \"evidence\": \"In vivo Lrig1 disruption and NSC culture with single-cell/EGFR readouts; compound Lrig1/Lrig3 mutant mice with Co-IP and axon-growth assays\",\n      \"pmids\": [\"33972529\", \"34338291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biophysical basis for uncoupling EGFR abundance from signaling unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established epigenetic silencing of LRIG1 as a cancer mechanism, restoring expression and reducing viability via targeted CRISPR-based demethylation/activation.\",\n      \"evidence\": \"Methylation-IP, 5-aza treatment, dCas9-TET1 and dCas9-VP64 targeting in basal/triple-negative breast cancer lines\",\n      \"pmids\": [\"35440669\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo therapeutic relevance untested\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a non-RTK immune role, showing LRIG1 is required for Treg suppressive function through the Smad2/3/Foxp3 axis.\",\n      \"evidence\": \"Lrig1-deficient mice, adoptive transfer, suppression assays, and autoimmune disease models with antibody intervention\",\n      \"pmids\": [\"37666819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between LRIG1 and Smad2/3/Foxp3 not fully resolved\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed two new ligand/receptor engagements: LRIG1 acts as an inhibitory checkpoint receptor binding VISTA to suppress TCR signaling, and binds TGF\\u03b2/BMP receptors and TGF\\u03b21 to facilitate SMAD signaling in NSCs.\",\n      \"evidence\": \"Co-IP/binding assays, T-cell-specific conditional knockouts and tumor models; Lrig1 knockout NSCs with SMAD phosphorylation assays\",\n      \"pmids\": [\"38758807\", \"38987622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of LRIG1-VISTA and LRIG1-TGF\\u03b2 interactions undefined\", \"TGF\\u03b2/BMP finding from single lab at Medium confidence\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected the VISTA-LRIG1 axis to tissue repair, showing macrophage VISTA engages epithelial LRIG1 to suppress PPAR\\u03b1 and impair intestinal repair during colitis.\",\n      \"evidence\": \"Co-IP, organoid assays, Vsir-/- and Vsir-/-Rag1-/- mice, macrophage transfer in DSS colitis\",\n      \"pmids\": [\"40883589\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking LRIG1 to PPAR\\u03b1 suppression unclear\", \"Single-lab study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LRIG1 mechanistically reconciles its conflicting models\\u2014direct ECD-receptor binding versus indirect regulation, and degradative versus ligand-blocking versus checkpoint modes across so many partners\\u2014remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of LRIG1 engaging its diverse RTK and non-RTK partners\", \"Direct vs indirect EGFR binding unreconciled (cf. conflicting reports)\", \"Determinants selecting between degradation, ligand-blocking, and checkpoint signaling unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 4, 5, 16]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 5, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 5, 16, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [20, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [8, 18, 27]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 17, 26]}\n    ],\n    \"complexes\": [\n      \"LRIG1-EGFR-E-cadherin ternary complex\",\n      \"LRIG1-ErbB-c-Cbl complex\"\n    ],\n    \"partners\": [\n      \"EGFR\",\n      \"MET\",\n      \"RET\",\n      \"NTRK2\",\n      \"USP8\",\n      \"CBL\",\n      \"VSIR\",\n      \"LRIG3\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}