{"gene":"LRRC59","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2012,"finding":"LRRC59 is strictly required for nuclear import of exogenous FGF1: siRNA-mediated depletion blocked nuclear import but not cytosolic translocation of FGF1. LRRC59 interacts with FGF1 and with importins Kpnα1 and Kpnβ1, and possesses NLS-like sequences in its cytosolic domain. Localization of LRRC59 to the nuclear envelope depends on Kpnβ1. LRRC59 is a membrane-anchored protein localizing to the ER and nuclear envelope.","method":"siRNA knockdown, co-immunoprecipitation, subcellular fractionation, nuclear import assays, NLS-mutant analysis","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal binding, siRNA loss-of-function with specific nuclear import phenotype, NLS mutagenesis, multiple orthogonal methods in one study","pmids":["22321063"],"is_preprint":false},{"year":2015,"finding":"LRRC59 is an ER membrane protein that promotes ligand-induced trafficking of nucleic acid-sensing TLRs (TLR3, 8, 9) from the ER to endosomes via association with UNC93B1. Upon ligand stimulation, LRRC59 associates with UNC93B1 in a TLR-independent manner requiring signals induced by ligand internalization. Knockdown of LRRC59 reduced TLR3-, 8-, and 9-mediated signaling and decreased endosomal localization of TLR3, but did not affect TLR4-mediated signaling.","method":"siRNA knockdown, co-immunoprecipitation, immunofluorescence/confocal microscopy, signaling reporter assays","journal":"Journal of Immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, siRNA loss-of-function with specific signaling and trafficking phenotypes, multiple TLR specificity controls","pmids":["26466955"],"is_preprint":false},{"year":2019,"finding":"LRRC59 positively regulates DDX58/RIG-I-mediated type I IFN signaling by interacting specifically with ISG15-associated DDX58 and blocking its association with LRRC25, thereby preventing SQSTM1/p62-dependent autophagic degradation of DDX58. LRRC59 knockout led to reduced type I IFN responses upon virus infection.","method":"Co-immunoprecipitation, LRRC59 knockout cells, siRNA knockdown, IFN reporter assays, virus infection (Sendai virus, VSV), autophagy inhibition with Bafilomycin A1","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP for binding, KO and KD with defined IFN signaling phenotype, multiple viral infection models, competition assay between LRRC59 and LRRC25","pmids":["31068071"],"is_preprint":false},{"year":2019,"finding":"LRRC59 is a tail-anchored protein with a single C-terminal transmembrane domain that is post-translationally inserted into ER-derived membranes independently of the TRC pathway. LRRC59 reaches the inner nuclear membrane (INM) by passive diffusion governed by the size of its cytoplasmic domain, rather than by importin α/β-dependent nuclear import.","method":"In vitro microsome insertion assay, rapamycin-dependent dimerization assay for INM localization, importin pathway inhibition, cytoplasmic domain size mutants","journal":"International Journal of Molecular Sciences","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro reconstitution with purified microsomes, functional INM targeting assay, multiple domain mutants, single lab with multiple orthogonal methods","pmids":["30650545"],"is_preprint":false},{"year":2020,"finding":"LRRC59 interacts with SRP pathway components, translation factors, and ER-localized RNA-binding proteins, and is required for efficient mRNA translation on the ER membrane. siRNA silencing of LRRC59 reduced steady-state translation on the ER by ~50% and also impacted cytosolic translation. Proximity proteomics revealed that LRRC59 defines a distinct protein interaction domain on the ER membrane separate from the translocon.","method":"BioID proximity proteomics, native immunoprecipitation, [35S]-methionine incorporation assay, siRNA knockdown","journal":"Molecular & Cellular Proteomics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — proximity proteomics plus native IP plus functional translation assay, single lab with multiple orthogonal methods","pmids":["32788342"],"is_preprint":false},{"year":2024,"finding":"LRRC59 interacts with CKAP4 (cytoskeleton-associated protein 4) and promotes formation of CKAP4-containing exosomes, regulating exosome secretion in OSCC cells. LRRC59 also interacts with SRP pathway components, translational initiation factors, and CRD-mediated mRNA stabilization factors as shown by TAP-MS.","method":"Tandem Affinity Purification-Mass Spectrometry (TAP-MS), co-immunoprecipitation, immunofluorescence, exosome isolation, co-culture experiments, siRNA knockdown","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 2-3 / Weak — co-IP and TAP-MS for interactions, single lab, exosome secretion assay for CKAP4 phenotype","pmids":["38533057"],"is_preprint":false},{"year":2025,"finding":"LRRC59 cooperates with nuclear transporters KPNB1 and XPO1 to restrain LEMD2-CHMP7 complex assembly at nuclear envelope (NE) rupture sites, preventing spreading of the ESCRT-III repair machinery across the NE. Disruption of this regulatory axis causes torsional DNA damage in ruptured nuclei and micronuclei. LRRC59 was identified as a critical regulator of LEMD2 accumulation at NE ruptures.","method":"Convergent proximity proteomics, live imaging of NE ruptures, co-immunoprecipitation, loss-of-function experiments, DNA damage assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — proximity proteomics, loss-of-function with specific NE repair and DNA damage phenotypes, multiple orthogonal methods, single lab","pmids":["41387506"],"is_preprint":false},{"year":2025,"finding":"LRRC59 inhibits the PERK ER stress signaling pathway: LRRC59 knockdown in colorectal cancer cells activated the PERK pathway and increased apoptosis, and this apoptosis was reduced by a PERK-specific inhibitor, placing LRRC59 as a suppressor of PERK-mediated apoptosis.","method":"siRNA/shRNA knockdown, western blotting for PERK pathway components, flow cytometry for apoptosis, PERK pathway inhibitor rescue, in vivo xenograft","journal":"Oncology Reports","confidence":"Medium","confidence_rationale":"Tier 2-3 / Weak — pharmacological rescue with PERK inhibitor supports pathway placement, single lab, no direct LRRC59-PERK binding demonstrated","pmids":["41133451"],"is_preprint":false}],"current_model":"LRRC59 is a tail-anchored ER/nuclear envelope membrane protein that functions as a multifunctional scaffold: it facilitates nuclear import of exogenous FGF1 via importins Kpnα1/Kpnβ1, promotes ligand-induced ER-to-endosome trafficking of nucleic acid-sensing TLRs through UNC93B1 association, positively regulates DDX58/RIG-I-mediated antiviral type I IFN signaling by blocking LRRC25-mediated autophagic degradation of ISG15-DDX58, organizes ER-localized mRNA translation through interactions with SRP pathway components and translation factors, and together with KPNB1/XPO1 restrains LEMD2-CHMP7 complex spreading to safeguard nuclear envelope repair and genome integrity."},"narrative":{"mechanistic_narrative":"LRRC59 is a tail-anchored endoplasmic reticulum and nuclear envelope membrane protein that acts as a multifunctional scaffold coordinating membrane protein trafficking, ER-associated translation, and innate immune and nuclear envelope homeostasis [PMID:22321063, PMID:30650545, PMID:32788342]. Its single C-terminal transmembrane domain is post-translationally inserted into ER-derived membranes independently of the TRC pathway, and it reaches the inner nuclear membrane by passive diffusion governed by the size of its cytoplasmic domain rather than by importin-dependent import [PMID:30650545]. At the ER membrane LRRC59 defines a protein interaction domain distinct from the translocon, associating with SRP pathway components and translation factors and supporting efficient mRNA translation on the ER [PMID:32788342]. Through its cytosolic domain it engages importins Kpnα1/Kpnβ1 to drive nuclear import of internalized FGF1 [PMID:22321063], and it associates with UNC93B1 to promote ligand-induced ER-to-endosome trafficking of nucleic acid-sensing TLRs (TLR3, TLR8, TLR9) required for their signaling [PMID:26466955]. LRRC59 also positively regulates DDX58/RIG-I antiviral type I interferon responses by binding ISG15-modified DDX58 and blocking LRRC25-mediated, SQSTM1/p62-dependent autophagic degradation [PMID:31068071], and it cooperates with KPNB1 and XPO1 to restrain LEMD2-CHMP7 ESCRT-III complex spreading at nuclear envelope rupture sites, protecting against torsional DNA damage [PMID:41387506].","teleology":[{"year":2012,"claim":"Established LRRC59 as an ER/nuclear envelope membrane protein with a defined cellular function — mediating nuclear import of internalized FGF1 — answering whether this protein had any trafficking role.","evidence":"siRNA knockdown, co-IP with FGF1 and importins Kpnα1/Kpnβ1, subcellular fractionation, NLS-mutant nuclear import assays","pmids":["22321063"],"confidence":"High","gaps":["Whether LRRC59 imports endogenous cargoes beyond FGF1 unresolved","Structural basis of FGF1/importin engagement not defined"]},{"year":2015,"claim":"Extended LRRC59 function to innate immunity by showing it promotes ligand-induced ER-to-endosome trafficking of nucleic acid-sensing TLRs through UNC93B1, addressing how these receptors relocate for signaling.","evidence":"siRNA knockdown, reciprocal co-IP with UNC93B1, confocal imaging of TLR3 endosomal localization, signaling reporter assays with TLR4 specificity control","pmids":["26466955"],"confidence":"High","gaps":["Ligand-induced signal triggering LRRC59-UNC93B1 association not identified","Direct vs indirect nature of the LRRC59-TLR relationship not resolved"]},{"year":2019,"claim":"Defined a mechanism by which LRRC59 sustains antiviral type I IFN signaling — protecting ISG15-modified DDX58/RIG-I from LRRC25/p62-dependent autophagic degradation — clarifying how RIG-I levels are stabilized during infection.","evidence":"Co-IP, LRRC59 knockout and knockdown, IFN reporter assays, Sendai/VSV infection, Bafilomycin A1 autophagy inhibition, LRRC59-LRRC25 competition assay","pmids":["31068071"],"confidence":"High","gaps":["Whether LRRC59 directly recognizes ISG15 or DDX58 not structurally defined","Regulation of the LRRC59/LRRC25 balance unknown"]},{"year":2019,"claim":"Resolved the biogenesis and topology of LRRC59, showing it is a TRC-independent tail-anchored protein reaching the inner nuclear membrane by diffusion limited by cytoplasmic domain size, separating its membrane targeting from importin-mediated import.","evidence":"In vitro microsome insertion assay, rapamycin-dimerization INM localization assay, importin pathway inhibition, cytoplasmic domain size mutants","pmids":["30650545"],"confidence":"High","gaps":["Insertase mediating TRC-independent insertion not identified","Functional consequence of INM versus ER pools not separated"]},{"year":2020,"claim":"Positioned LRRC59 as an organizer of ER-localized translation, defining an ER membrane interaction domain distinct from the translocon and showing it is required for efficient mRNA translation.","evidence":"BioID proximity proteomics, native IP with SRP/translation factors, [35S]-methionine incorporation, siRNA knockdown","pmids":["32788342"],"confidence":"High","gaps":["Which mRNAs depend on LRRC59 for translation not defined","Mechanism linking LRRC59 to ribosome/SRP recruitment unresolved"]},{"year":2024,"claim":"Linked LRRC59 to exosome biology via CKAP4, while reproducing its association with SRP and translation/mRNA-stabilization machinery, broadening its scaffold roles in cancer cells.","evidence":"TAP-MS, co-IP with CKAP4, immunofluorescence, exosome isolation, co-culture and siRNA knockdown in OSCC cells","pmids":["38533057"],"confidence":"Medium","gaps":["Direct CKAP4 binding versus complex co-purification not distinguished","Single cell-type context; generality of exosome role untested"]},{"year":2025,"claim":"Identified LRRC59 as a regulator of nuclear envelope repair, cooperating with KPNB1/XPO1 to restrain LEMD2-CHMP7 ESCRT-III spreading at NE rupture sites and thereby limit torsional DNA damage.","evidence":"Convergent proximity proteomics, live imaging of NE ruptures, co-IP, loss-of-function and DNA damage assays","pmids":["41387506"],"confidence":"High","gaps":["Molecular mechanism by which LRRC59 limits LEMD2 accumulation not defined","Relationship to its ER translation and import functions unclear"]},{"year":2025,"claim":"Placed LRRC59 as a suppressor of PERK-mediated ER stress apoptosis in colorectal cancer, where its loss activates PERK signaling and apoptosis.","evidence":"siRNA/shRNA knockdown, western blot of PERK components, flow cytometry apoptosis, PERK inhibitor rescue, xenograft","pmids":["41133451"],"confidence":"Medium","gaps":["No direct LRRC59-PERK binding demonstrated","Whether PERK regulation is direct or downstream of translation defects unknown"]},{"year":null,"claim":"How LRRC59's distinct roles — nuclear import, TLR trafficking, RIG-I stabilization, ER translation, NE repair, and ER stress — are mechanistically integrated through a single scaffold remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of LRRC59 domains engaging its multiple partners","No unifying biochemical activity established across functions"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1,3,4]},{"term_id":"GO:0005635","term_label":"nuclear envelope","supporting_discovery_ids":[0,3,6]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[2]}],"complexes":[],"partners":["KPNB1","KPNA2","UNC93B1","DDX58","LRRC25","XPO1","LEMD2","CKAP4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96AG4","full_name":"Leucine-rich repeat-containing protein 59","aliases":["Ribosome-binding protein p34","p34"],"length_aa":307,"mass_kda":34.9,"function":"Required for nuclear import of FGF1, but not that of FGF2. Might regulate nuclear import of exogenous FGF1 by facilitating interaction with the nuclear import machinery and by transporting cytosolic FGF1 to, and possibly through, the nuclear pores","subcellular_location":"Microsome membrane; Endoplasmic reticulum membrane; Nucleus envelope","url":"https://www.uniprot.org/uniprotkb/Q96AG4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LRRC59","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PLA2G4A","stoichiometry":4.0},{"gene":"RPS16","stoichiometry":4.0},{"gene":"CCDC47","stoichiometry":4.0},{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"CANX","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CSNK2B","stoichiometry":0.2},{"gene":"G3BP2","stoichiometry":0.2},{"gene":"PSPC1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/LRRC59","total_profiled":1310},"omim":[{"mim_id":"614854","title":"LEUCINE-RICH REPEAT-CONTAINING PROTEIN 59; LRRC59","url":"https://www.omim.org/entry/614854"},{"mim_id":"131220","title":"FIBROBLAST GROWTH FACTOR 1; FGF1","url":"https://www.omim.org/entry/131220"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Endoplasmic reticulum","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LRRC59"},"hgnc":{"alias_symbol":["PRO1855","FLJ21675"],"prev_symbol":[]},"alphafold":{"accession":"Q96AG4","domains":[{"cath_id":"3.80.10.10","chopping":"11-154","consensus_level":"high","plddt":96.5416,"start":11,"end":154},{"cath_id":"1.20.5","chopping":"269-307","consensus_level":"medium","plddt":79.8418,"start":269,"end":307}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96AG4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96AG4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96AG4-F1-predicted_aligned_error_v6.png","plddt_mean":87.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LRRC59","jax_strain_url":"https://www.jax.org/strain/search?query=LRRC59"},"sequence":{"accession":"Q96AG4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96AG4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96AG4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96AG4"}},"corpus_meta":[{"pmid":"31068071","id":"PMC_31068071","title":"LRRC59 modulates type I interferon signaling by restraining the SQSTM1/p62-mediated autophagic degradation of pattern recognition receptor DDX58/RIG-I.","date":"2019","source":"Autophagy","url":"https://pubmed.ncbi.nlm.nih.gov/31068071","citation_count":70,"is_preprint":false},{"pmid":"22321063","id":"PMC_22321063","title":"Nuclear import of exogenous FGF1 requires the ER-protein LRRC59 and the importins Kpnα1 and Kpnβ1.","date":"2012","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/22321063","citation_count":54,"is_preprint":false},{"pmid":"26466955","id":"PMC_26466955","title":"LRRC59 Regulates Trafficking of Nucleic Acid-Sensing TLRs from the Endoplasmic Reticulum via Association with UNC93B1.","date":"2015","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/26466955","citation_count":28,"is_preprint":false},{"pmid":"32788342","id":"PMC_32788342","title":"Quantitative Proteomics Links the LRRC59 Interactome to mRNA Translation on the ER Membrane.","date":"2020","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/32788342","citation_count":20,"is_preprint":false},{"pmid":"30650545","id":"PMC_30650545","title":"Targeting of LRRC59 to the Endoplasmic Reticulum and the Inner Nuclear Membrane.","date":"2019","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/30650545","citation_count":19,"is_preprint":false},{"pmid":"38533057","id":"PMC_38533057","title":"LRRC59 promotes the progression of oral squamous cell carcinoma by interacting with SRP pathway components and enhancing the secretion of CKAP4-containing exosomes.","date":"2024","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/38533057","citation_count":2,"is_preprint":false},{"pmid":"41387506","id":"PMC_41387506","title":"LRRC59 cooperates with nuclear transporters to restrain the nuclear envelope repair machinery and safeguard genome integrity.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/41387506","citation_count":0,"is_preprint":false},{"pmid":"41133451","id":"PMC_41133451","title":"LRRC59 inhibits perk pathway‑induced apoptosis and promotes cell proliferation, migration and invasion in colorectal cancer cells.","date":"2025","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/41133451","citation_count":0,"is_preprint":false},{"pmid":"42049972","id":"PMC_42049972","title":"Downregulation of LRRC59 suppresses cervical cancer progression likely by inhibiting YBX1-mediated Wnt/β-catenin signaling.","date":"2026","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/42049972","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7307,"output_tokens":2369,"usd":0.028728,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9424,"output_tokens":3217,"usd":0.063772,"stage2_stop_reason":"end_turn"},"total_usd":0.0925,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"LRRC59 is strictly required for nuclear import of exogenous FGF1: siRNA-mediated depletion blocked nuclear import but not cytosolic translocation of FGF1. LRRC59 interacts with FGF1 and with importins Kpnα1 and Kpnβ1, and possesses NLS-like sequences in its cytosolic domain. Localization of LRRC59 to the nuclear envelope depends on Kpnβ1. LRRC59 is a membrane-anchored protein localizing to the ER and nuclear envelope.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, subcellular fractionation, nuclear import assays, NLS-mutant analysis\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding, siRNA loss-of-function with specific nuclear import phenotype, NLS mutagenesis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"22321063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRRC59 is an ER membrane protein that promotes ligand-induced trafficking of nucleic acid-sensing TLRs (TLR3, 8, 9) from the ER to endosomes via association with UNC93B1. Upon ligand stimulation, LRRC59 associates with UNC93B1 in a TLR-independent manner requiring signals induced by ligand internalization. Knockdown of LRRC59 reduced TLR3-, 8-, and 9-mediated signaling and decreased endosomal localization of TLR3, but did not affect TLR4-mediated signaling.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, immunofluorescence/confocal microscopy, signaling reporter assays\",\n      \"journal\": \"Journal of Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, siRNA loss-of-function with specific signaling and trafficking phenotypes, multiple TLR specificity controls\",\n      \"pmids\": [\"26466955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LRRC59 positively regulates DDX58/RIG-I-mediated type I IFN signaling by interacting specifically with ISG15-associated DDX58 and blocking its association with LRRC25, thereby preventing SQSTM1/p62-dependent autophagic degradation of DDX58. LRRC59 knockout led to reduced type I IFN responses upon virus infection.\",\n      \"method\": \"Co-immunoprecipitation, LRRC59 knockout cells, siRNA knockdown, IFN reporter assays, virus infection (Sendai virus, VSV), autophagy inhibition with Bafilomycin A1\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP for binding, KO and KD with defined IFN signaling phenotype, multiple viral infection models, competition assay between LRRC59 and LRRC25\",\n      \"pmids\": [\"31068071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LRRC59 is a tail-anchored protein with a single C-terminal transmembrane domain that is post-translationally inserted into ER-derived membranes independently of the TRC pathway. LRRC59 reaches the inner nuclear membrane (INM) by passive diffusion governed by the size of its cytoplasmic domain, rather than by importin α/β-dependent nuclear import.\",\n      \"method\": \"In vitro microsome insertion assay, rapamycin-dependent dimerization assay for INM localization, importin pathway inhibition, cytoplasmic domain size mutants\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro reconstitution with purified microsomes, functional INM targeting assay, multiple domain mutants, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"30650545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LRRC59 interacts with SRP pathway components, translation factors, and ER-localized RNA-binding proteins, and is required for efficient mRNA translation on the ER membrane. siRNA silencing of LRRC59 reduced steady-state translation on the ER by ~50% and also impacted cytosolic translation. Proximity proteomics revealed that LRRC59 defines a distinct protein interaction domain on the ER membrane separate from the translocon.\",\n      \"method\": \"BioID proximity proteomics, native immunoprecipitation, [35S]-methionine incorporation assay, siRNA knockdown\",\n      \"journal\": \"Molecular & Cellular Proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity proteomics plus native IP plus functional translation assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"32788342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LRRC59 interacts with CKAP4 (cytoskeleton-associated protein 4) and promotes formation of CKAP4-containing exosomes, regulating exosome secretion in OSCC cells. LRRC59 also interacts with SRP pathway components, translational initiation factors, and CRD-mediated mRNA stabilization factors as shown by TAP-MS.\",\n      \"method\": \"Tandem Affinity Purification-Mass Spectrometry (TAP-MS), co-immunoprecipitation, immunofluorescence, exosome isolation, co-culture experiments, siRNA knockdown\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Weak — co-IP and TAP-MS for interactions, single lab, exosome secretion assay for CKAP4 phenotype\",\n      \"pmids\": [\"38533057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LRRC59 cooperates with nuclear transporters KPNB1 and XPO1 to restrain LEMD2-CHMP7 complex assembly at nuclear envelope (NE) rupture sites, preventing spreading of the ESCRT-III repair machinery across the NE. Disruption of this regulatory axis causes torsional DNA damage in ruptured nuclei and micronuclei. LRRC59 was identified as a critical regulator of LEMD2 accumulation at NE ruptures.\",\n      \"method\": \"Convergent proximity proteomics, live imaging of NE ruptures, co-immunoprecipitation, loss-of-function experiments, DNA damage assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity proteomics, loss-of-function with specific NE repair and DNA damage phenotypes, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"41387506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LRRC59 inhibits the PERK ER stress signaling pathway: LRRC59 knockdown in colorectal cancer cells activated the PERK pathway and increased apoptosis, and this apoptosis was reduced by a PERK-specific inhibitor, placing LRRC59 as a suppressor of PERK-mediated apoptosis.\",\n      \"method\": \"siRNA/shRNA knockdown, western blotting for PERK pathway components, flow cytometry for apoptosis, PERK pathway inhibitor rescue, in vivo xenograft\",\n      \"journal\": \"Oncology Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Weak — pharmacological rescue with PERK inhibitor supports pathway placement, single lab, no direct LRRC59-PERK binding demonstrated\",\n      \"pmids\": [\"41133451\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LRRC59 is a tail-anchored ER/nuclear envelope membrane protein that functions as a multifunctional scaffold: it facilitates nuclear import of exogenous FGF1 via importins Kpnα1/Kpnβ1, promotes ligand-induced ER-to-endosome trafficking of nucleic acid-sensing TLRs through UNC93B1 association, positively regulates DDX58/RIG-I-mediated antiviral type I IFN signaling by blocking LRRC25-mediated autophagic degradation of ISG15-DDX58, organizes ER-localized mRNA translation through interactions with SRP pathway components and translation factors, and together with KPNB1/XPO1 restrains LEMD2-CHMP7 complex spreading to safeguard nuclear envelope repair and genome integrity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LRRC59 is a tail-anchored endoplasmic reticulum and nuclear envelope membrane protein that acts as a multifunctional scaffold coordinating membrane protein trafficking, ER-associated translation, and innate immune and nuclear envelope homeostasis [#0, #3, #4]. Its single C-terminal transmembrane domain is post-translationally inserted into ER-derived membranes independently of the TRC pathway, and it reaches the inner nuclear membrane by passive diffusion governed by the size of its cytoplasmic domain rather than by importin-dependent import [#3]. At the ER membrane LRRC59 defines a protein interaction domain distinct from the translocon, associating with SRP pathway components and translation factors and supporting efficient mRNA translation on the ER [#4]. Through its cytosolic domain it engages importins Kpnα1/Kpnβ1 to drive nuclear import of internalized FGF1 [#0], and it associates with UNC93B1 to promote ligand-induced ER-to-endosome trafficking of nucleic acid-sensing TLRs (TLR3, TLR8, TLR9) required for their signaling [#1]. LRRC59 also positively regulates DDX58/RIG-I antiviral type I interferon responses by binding ISG15-modified DDX58 and blocking LRRC25-mediated, SQSTM1/p62-dependent autophagic degradation [#2], and it cooperates with KPNB1 and XPO1 to restrain LEMD2-CHMP7 ESCRT-III complex spreading at nuclear envelope rupture sites, protecting against torsional DNA damage [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established LRRC59 as an ER/nuclear envelope membrane protein with a defined cellular function — mediating nuclear import of internalized FGF1 — answering whether this protein had any trafficking role.\",\n      \"evidence\": \"siRNA knockdown, co-IP with FGF1 and importins Kpnα1/Kpnβ1, subcellular fractionation, NLS-mutant nuclear import assays\",\n      \"pmids\": [\"22321063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LRRC59 imports endogenous cargoes beyond FGF1 unresolved\", \"Structural basis of FGF1/importin engagement not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended LRRC59 function to innate immunity by showing it promotes ligand-induced ER-to-endosome trafficking of nucleic acid-sensing TLRs through UNC93B1, addressing how these receptors relocate for signaling.\",\n      \"evidence\": \"siRNA knockdown, reciprocal co-IP with UNC93B1, confocal imaging of TLR3 endosomal localization, signaling reporter assays with TLR4 specificity control\",\n      \"pmids\": [\"26466955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand-induced signal triggering LRRC59-UNC93B1 association not identified\", \"Direct vs indirect nature of the LRRC59-TLR relationship not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a mechanism by which LRRC59 sustains antiviral type I IFN signaling — protecting ISG15-modified DDX58/RIG-I from LRRC25/p62-dependent autophagic degradation — clarifying how RIG-I levels are stabilized during infection.\",\n      \"evidence\": \"Co-IP, LRRC59 knockout and knockdown, IFN reporter assays, Sendai/VSV infection, Bafilomycin A1 autophagy inhibition, LRRC59-LRRC25 competition assay\",\n      \"pmids\": [\"31068071\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LRRC59 directly recognizes ISG15 or DDX58 not structurally defined\", \"Regulation of the LRRC59/LRRC25 balance unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the biogenesis and topology of LRRC59, showing it is a TRC-independent tail-anchored protein reaching the inner nuclear membrane by diffusion limited by cytoplasmic domain size, separating its membrane targeting from importin-mediated import.\",\n      \"evidence\": \"In vitro microsome insertion assay, rapamycin-dimerization INM localization assay, importin pathway inhibition, cytoplasmic domain size mutants\",\n      \"pmids\": [\"30650545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Insertase mediating TRC-independent insertion not identified\", \"Functional consequence of INM versus ER pools not separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Positioned LRRC59 as an organizer of ER-localized translation, defining an ER membrane interaction domain distinct from the translocon and showing it is required for efficient mRNA translation.\",\n      \"evidence\": \"BioID proximity proteomics, native IP with SRP/translation factors, [35S]-methionine incorporation, siRNA knockdown\",\n      \"pmids\": [\"32788342\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which mRNAs depend on LRRC59 for translation not defined\", \"Mechanism linking LRRC59 to ribosome/SRP recruitment unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked LRRC59 to exosome biology via CKAP4, while reproducing its association with SRP and translation/mRNA-stabilization machinery, broadening its scaffold roles in cancer cells.\",\n      \"evidence\": \"TAP-MS, co-IP with CKAP4, immunofluorescence, exosome isolation, co-culture and siRNA knockdown in OSCC cells\",\n      \"pmids\": [\"38533057\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct CKAP4 binding versus complex co-purification not distinguished\", \"Single cell-type context; generality of exosome role untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified LRRC59 as a regulator of nuclear envelope repair, cooperating with KPNB1/XPO1 to restrain LEMD2-CHMP7 ESCRT-III spreading at NE rupture sites and thereby limit torsional DNA damage.\",\n      \"evidence\": \"Convergent proximity proteomics, live imaging of NE ruptures, co-IP, loss-of-function and DNA damage assays\",\n      \"pmids\": [\"41387506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which LRRC59 limits LEMD2 accumulation not defined\", \"Relationship to its ER translation and import functions unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed LRRC59 as a suppressor of PERK-mediated ER stress apoptosis in colorectal cancer, where its loss activates PERK signaling and apoptosis.\",\n      \"evidence\": \"siRNA/shRNA knockdown, western blot of PERK components, flow cytometry apoptosis, PERK inhibitor rescue, xenograft\",\n      \"pmids\": [\"41133451\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct LRRC59-PERK binding demonstrated\", \"Whether PERK regulation is direct or downstream of translation defects unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LRRC59's distinct roles — nuclear import, TLR trafficking, RIG-I stabilization, ER translation, NE repair, and ER stress — are mechanistically integrated through a single scaffold remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of LRRC59 domains engaging its multiple partners\", \"No unifying biochemical activity established across functions\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1, 3, 4]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [0, 3, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"KPNB1\", \"KPNA2\", \"UNC93B1\", \"DDX58\", \"LRRC25\", \"XPO1\", \"LEMD2\", \"CKAP4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}