{"gene":"KTN1","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2019,"finding":"KTN1 protein acts as a key mediator downstream of MALAT1/c-MYC in regulating EGFR protein expression. Mechanistically, MALAT1 interacts with c-MYC to form a complex that directly binds the KTN1 promoter and enhances its transactivation, which in turn positively regulates EGFR protein (but not mRNA) expression in cutaneous squamous cell carcinoma cells.","method":"Transcriptomic sequencing, promoter binding assays, co-immunoprecipitation, gain/loss-of-function experiments with phenotypic readouts in vitro and in vivo xenograft models","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, promoter binding, Co-IP, functional rescue) in single lab; establishes KTN1 as EGFR regulator downstream of MALAT1/c-MYC","pmids":["30683916"],"is_preprint":false},{"year":2021,"finding":"KTN1 protein promotes bladder cancer cell proliferation, invasion, and migration via activation of Rho GTPase-mediated signaling (RAC1, RHOA, CDC42). The lncRNA KTN1-AS1 recruits the histone acetyltransferase EP300 to the KTN1 promoter, enriching H3K27 acetylation and thereby upregulating KTN1 expression in cis.","method":"RNA immunoprecipitation, chromatin immunoprecipitation (ChIP), KTN1-AS1 knockdown/overexpression with cell proliferation/invasion/migration assays, in vitro and in vivo systems","journal":"Clinical science (London, England : 1979)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal IP, ChIP, functional rescue in single lab; two orthogonal methods linking KTN1 to Rho GTPase signaling","pmids":["33480975"],"is_preprint":false},{"year":2021,"finding":"KTN1 knockout in Huh7 hepatocellular carcinoma cells inhibited cell viability, migration, and invasion, increased the G0/G1 cell cycle fraction, and elevated apoptosis rates. RNA sequencing after KTN1 knockout revealed deregulation of innate immune response, chemical carcinogenesis, and RNA polymerase II transcription pathways, placing KTN1 in cell cycle and DNA replication cascades.","method":"CRISPR/Cas9 knockout, RNA sequencing, cell migration/invasion/viability/apoptosis assays","journal":"Journal of Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined phenotypic readouts and transcriptomic pathway analysis, single lab","pmids":["34234850"],"is_preprint":false},{"year":2024,"finding":"KTN1 is an endoplasmic reticulum protein whose expression is upregulated by ionizing radiation (IR) in keratinocytes. KTN1 depletion reduced ER expansion and downregulated UPR pathway proteins (PERK, IRE1α, ATF6), aggravating IR-induced DNA damage and suppressing cell proliferation. Reactivation of UPR (with tunicamycin) reversed the effects of KTN1 depletion, establishing that KTN1 protects keratinocytes from IR-induced DNA damage through its role in promoting the unfolded protein response.","method":"Transmission electron microscopy, immunoblotting, siRNA knockdown, pharmacological UPR inhibition (4-PBA) and activation (tunicamycin), cell proliferation assays, DNA damage readouts","journal":"Journal of dermatological science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO/KD with rescue experiment, multiple orthogonal methods (TEM, immunoblotting, pharmacological rescue), single lab","pmids":["38448340"],"is_preprint":false},{"year":2024,"finding":"KTN1 (kinectin), an integral ER membrane protein, recruits the dynein adaptor CDR2 to ER sheets. Loss of CDR2 and its paralog CDR2L enhances KTN1-dependent ER sheet stacking. Exogenous CDR2 (requiring its dynein-binding CC1 box motif) reverses this stacking and promotes centrosome-proximal clustering of ER sheets, demonstrating that KTN1 organizes ER sheet architecture by serving as the membrane anchor for CDR2-dynein complexes. CDR2 competes with eEF1Bβ (translation elongation factor 1 subunit) for binding to KTN1.","method":"Biochemical assays (Co-IP/pulldown), double knockout cell lines, exogenous rescue with wild-type and CC1-box mutant CDR2, siRNA knockdown of eEF1Bβ, cell-based ER morphology assays","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal biochemical and cell-based methods in a single rigorous study: Co-IP, DKO phenotype, domain-specific rescue mutagenesis, competitor binding assay; establishes direct molecular mechanism","pmids":["bio_10.1101_2024.11.06.622207"],"is_preprint":true}],"current_model":"KTN1 (kinectin 1) is an integral endoplasmic reticulum membrane protein that organizes ER sheet architecture by recruiting the dynein adaptor CDR2 (competing with eEF1Bβ for the same binding site), thereby coupling ER sheets to cytoplasmic dynein-1; additionally, KTN1 supports the unfolded protein response (promoting ER expansion and PERK/IRE1α/ATF6 activity) to protect cells from genotoxic stress, and in the context of epithelial cancers it functions downstream of transcriptional regulators (MALAT1/c-MYC) to control EGFR protein levels and activates Rho GTPase (RAC1, RHOA, CDC42) signaling to drive cell proliferation, migration, and invasion."},"narrative":{"mechanistic_narrative":"KTN1 (kinectin 1) is an integral endoplasmic reticulum membrane protein that organizes ER sheet architecture and links ER membranes to cytoskeletal motors [PMID:bio_10.1101_2024.11.06.622207]. It serves as the membrane anchor for the dynein adaptor CDR2, recruiting CDR2-dynein complexes to ER sheets; loss of CDR2 and its paralog CDR2L enhances KTN1-dependent ER sheet stacking, while exogenous CDR2 bearing its dynein-binding CC1 box motif reverses stacking and clusters ER sheets near the centrosome, and CDR2 competes with the translation elongation factor subunit eEF1Bβ for the same KTN1 binding site [PMID:bio_10.1101_2024.11.06.622207]. KTN1 also supports the unfolded protein response: its expression is induced by ionizing radiation in keratinocytes, and KTN1 depletion reduces ER expansion and lowers PERK, IRE1α, and ATF6 levels, aggravating DNA damage and suppressing proliferation in a manner reversed by pharmacological UPR reactivation [PMID:38448340]. In epithelial cancers KTN1 acts downstream of transcriptional regulators to drive malignant phenotypes—it is a mediator of MALAT1/c-MYC control of EGFR protein levels in cutaneous squamous cell carcinoma [PMID:30683916] and promotes proliferation, invasion, and migration through Rho GTPase (RAC1, RHOA, CDC42) signaling in bladder cancer [PMID:33480975], with its loss impairing viability and arresting the cell cycle in hepatocellular carcinoma cells [PMID:34234850].","teleology":[{"year":2019,"claim":"Established KTN1 as a functional effector node linking an oncogenic transcriptional axis to growth-factor receptor levels, answering how MALAT1/c-MYC controls EGFR.","evidence":"Transcriptomics, promoter binding and Co-IP with gain/loss-of-function in cutaneous squamous cell carcinoma cells and xenografts","pmids":["30683916"],"confidence":"Medium","gaps":["Mechanism by which KTN1 raises EGFR protein but not mRNA is not defined","Whether this depends on KTN1's ER membrane role is untested"]},{"year":2021,"claim":"Connected KTN1 to actin-regulatory Rho GTPase signaling and identified a cis-acting lncRNA mechanism (KTN1-AS1/EP300) driving its expression, explaining how KTN1 promotes invasion.","evidence":"RIP, ChIP, and KTN1-AS1 knockdown/overexpression with proliferation/invasion/migration assays in bladder cancer models","pmids":["33480975"],"confidence":"Medium","gaps":["Direct biochemical link between KTN1 and RAC1/RHOA/CDC42 activation not resolved","Whether Rho activation requires the ER-anchored protein is unknown"]},{"year":2021,"claim":"Defined KTN1 as required for cancer cell cycle progression and survival, placing it within proliferation and DNA replication cascades.","evidence":"CRISPR/Cas9 knockout with RNA-seq and viability/migration/apoptosis/cell-cycle assays in Huh7 hepatocellular carcinoma cells","pmids":["34234850"],"confidence":"Medium","gaps":["Transcriptomic deregulation is correlative; direct targets unidentified","Molecular basis of G0/G1 arrest after KTN1 loss not established"]},{"year":2024,"claim":"Revealed a protective ER-stress function: KTN1 promotes ER expansion and UPR signaling to limit genotoxic damage, answering how it buffers cells against ionizing radiation.","evidence":"TEM, immunoblotting, siRNA, and pharmacological UPR inhibition/activation (4-PBA/tunicamycin) with DNA damage and proliferation readouts in keratinocytes","pmids":["38448340"],"confidence":"Medium","gaps":["How KTN1 mechanistically activates PERK/IRE1α/ATF6 is unknown","Whether UPR support and cancer phenotypes share a common mechanism is untested"]},{"year":2024,"claim":"Resolved KTN1's core molecular activity—anchoring CDR2-dynein complexes to organize ER sheet architecture—and identified competitive occupancy of its binding site by eEF1Bβ.","evidence":"Co-IP/pulldown, CDR2/CDR2L double-knockout cells, CC1-box mutant rescue, and eEF1Bβ knockdown with ER morphology assays (preprint)","pmids":["bio_10.1101_2024.11.06.622207"],"confidence":"High","gaps":["Functional consequence of eEF1Bβ competition for translation or ER shape not defined","Structural basis of the shared KTN1 binding site is unresolved"]},{"year":null,"claim":"Whether KTN1's ER-shaping/dynein-anchoring role mechanistically underlies its UPR-protective and pro-tumorigenic functions remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No study links the CDR2-dynein anchoring mechanism to EGFR or Rho GTPase phenotypes","No structural model of KTN1 binding interfaces","Direct biochemical bridge from KTN1 to UPR sensor activation is missing"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[3]}],"complexes":[],"partners":["CDR2","EEF1BΒ"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86UP2","full_name":"Kinectin","aliases":["CG-1 antigen","Kinesin receptor"],"length_aa":1357,"mass_kda":156.3,"function":"Receptor for kinesin thus involved in kinesin-driven vesicle motility. Accumulates in integrin-based adhesion complexes (IAC) upon integrin aggregation by fibronectin","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q86UP2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KTN1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"TMEM147","stoichiometry":10.0},{"gene":"RPL35","stoichiometry":4.0},{"gene":"ATG13","stoichiometry":0.2},{"gene":"ATG4B","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"CAPRIN1","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CTCF","stoichiometry":0.2},{"gene":"DDX6","stoichiometry":0.2},{"gene":"DRG1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/KTN1","total_profiled":1310},"omim":[{"mim_id":"620533","title":"LONG INTERGENIC NONCODING RNA 520; LINC00520","url":"https://www.omim.org/entry/620533"},{"mim_id":"600381","title":"KINECTIN; KTN1","url":"https://www.omim.org/entry/600381"},{"mim_id":"130592","title":"EUKARYOTIC TRANSLATION ELONGATION FACTOR 1, DELTA; EEF1D","url":"https://www.omim.org/entry/130592"}],"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/KTN1"},"hgnc":{"alias_symbol":["KIAA0004","CG1","KNT"],"prev_symbol":[]},"alphafold":{"accession":"Q86UP2","domains":[{"cath_id":"1.20.5","chopping":"333-491","consensus_level":"high","plddt":85.3713,"start":333,"end":491}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86UP2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86UP2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86UP2-F1-predicted_aligned_error_v6.png","plddt_mean":71.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KTN1","jax_strain_url":"https://www.jax.org/strain/search?query=KTN1"},"sequence":{"accession":"Q86UP2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86UP2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86UP2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86UP2"}},"corpus_meta":[{"pmid":"21565223","id":"PMC_21565223","title":"The novel δ opioid receptor 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letters","url":"https://pubmed.ncbi.nlm.nih.gov/32956741","citation_count":3,"is_preprint":false},{"pmid":"35381130","id":"PMC_35381130","title":"IncRNA KTN1-AS1 Silencing Inhibits Non-Small-Cell Lung Cancer Cell Proliferation and KTN1-AS1 Expression Predicts Survival.","date":"2022","source":"Critical reviews in eukaryotic gene expression","url":"https://pubmed.ncbi.nlm.nih.gov/35381130","citation_count":2,"is_preprint":false},{"pmid":"36890161","id":"PMC_36890161","title":"A significant, functional and replicable risk KTN1 variant block for schizophrenia.","date":"2023","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/36890161","citation_count":2,"is_preprint":false},{"pmid":"9229083","id":"PMC_9229083","title":"Morphological and morphometric features of the deformed cervical and caudal vertebrae in a new mutant knotty-tail (knt/knt) mouse.","date":"1997","source":"Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft","url":"https://pubmed.ncbi.nlm.nih.gov/9229083","citation_count":2,"is_preprint":false},{"pmid":"40204491","id":"PMC_40204491","title":"Structure-Signal Relationships of the δ-Opioid-Receptor (DOR)-Selective Agonist KNT-127-Part II: Quinoline Ring Modifications for Enhanced G-Protein Signaling and Reduced β-Arrestin Recruitment.","date":"2025","source":"Chemical & pharmaceutical bulletin","url":"https://pubmed.ncbi.nlm.nih.gov/40204491","citation_count":2,"is_preprint":false},{"pmid":"40159181","id":"PMC_40159181","title":"Structure-Signal Relationships of the δ-Opioid-Receptor (DOR)-Selective Agonist KNT-127-Part I: Impact of the Morphinan Skeleton on the G-Protein-Biased DOR Agonism.","date":"2025","source":"Chemical & pharmaceutical bulletin","url":"https://pubmed.ncbi.nlm.nih.gov/40159181","citation_count":1,"is_preprint":false},{"pmid":"37992546","id":"PMC_37992546","title":"A genetic and transcriptomic assessment of the KTN1 gene in Parkinson's disease risk.","date":"2023","source":"Neurobiology of aging","url":"https://pubmed.ncbi.nlm.nih.gov/37992546","citation_count":0,"is_preprint":false},{"pmid":"32147999","id":"PMC_32147999","title":"[Structural variations caused by transposons in porcine ktn1 gene and their association with production traits].","date":"2020","source":"Sheng wu gong cheng xue bao = Chinese journal of biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/32147999","citation_count":0,"is_preprint":false},{"pmid":"42100002","id":"PMC_42100002","title":"Bioproduction of ∼10 knt single-stranded DNA for constructing large DNA origami structures.","date":"2026","source":"Materials today. Bio","url":"https://pubmed.ncbi.nlm.nih.gov/42100002","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.11.06.622207","title":"CDR2 is a dynein adaptor recruited by kinectin to regulate ER sheet organization","date":"2024-11-06","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.06.622207","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.29.635494","title":"Measuring bridging forces in protein-DNA condensates","date":"2025-01-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.29.635494","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":30185,"output_tokens":2034,"usd":0.060533,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8519,"output_tokens":2274,"usd":0.049723,"stage2_stop_reason":"end_turn"},"total_usd":0.110256,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers about KTN1 (kinectin 1, the canonical protein-coding gene), not the KNT-127 delta-opioid agonist compound, the KTN1-AS1 lncRNA, or other unrelated genes/compounds.\n\nPapers about KTN1 protein (canonical gene):\n- Paper [5]: MALAT1-KTN1-EGFR axis in cSCC (KTN1 as mediator of EGFR regulation)\n- Paper [13]: KTN1-AS1 promotes KTN1 cis-activation and Rho GTPase signaling in bladder cancer (mentions KTN1 protein mechanism)\n- Paper [25]: KTN1 knockout in HCC cells\n- Paper [38]: KTN1 in UPR/ER stress response in keratinocytes\n- Paper [50]: CDR2 recruited by kinectin (KTN1) to regulate ER sheet organization - PREPRINT, mechanistic\n\nPapers [1]-[4], [6]-[12], [14]-[24], [26]-[37], [39]-[49], [51] are about KNT-127 compound, KTN1-AS1 lncRNA, mouse mutant knt gene, porcine ktn1, or unrelated topics.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"KTN1 protein acts as a key mediator downstream of MALAT1/c-MYC in regulating EGFR protein expression. Mechanistically, MALAT1 interacts with c-MYC to form a complex that directly binds the KTN1 promoter and enhances its transactivation, which in turn positively regulates EGFR protein (but not mRNA) expression in cutaneous squamous cell carcinoma cells.\",\n      \"method\": \"Transcriptomic sequencing, promoter binding assays, co-immunoprecipitation, gain/loss-of-function experiments with phenotypic readouts in vitro and in vivo xenograft models\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (transcriptomics, promoter binding, Co-IP, functional rescue) in single lab; establishes KTN1 as EGFR regulator downstream of MALAT1/c-MYC\",\n      \"pmids\": [\"30683916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KTN1 protein promotes bladder cancer cell proliferation, invasion, and migration via activation of Rho GTPase-mediated signaling (RAC1, RHOA, CDC42). The lncRNA KTN1-AS1 recruits the histone acetyltransferase EP300 to the KTN1 promoter, enriching H3K27 acetylation and thereby upregulating KTN1 expression in cis.\",\n      \"method\": \"RNA immunoprecipitation, chromatin immunoprecipitation (ChIP), KTN1-AS1 knockdown/overexpression with cell proliferation/invasion/migration assays, in vitro and in vivo systems\",\n      \"journal\": \"Clinical science (London, England : 1979)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal IP, ChIP, functional rescue in single lab; two orthogonal methods linking KTN1 to Rho GTPase signaling\",\n      \"pmids\": [\"33480975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KTN1 knockout in Huh7 hepatocellular carcinoma cells inhibited cell viability, migration, and invasion, increased the G0/G1 cell cycle fraction, and elevated apoptosis rates. RNA sequencing after KTN1 knockout revealed deregulation of innate immune response, chemical carcinogenesis, and RNA polymerase II transcription pathways, placing KTN1 in cell cycle and DNA replication cascades.\",\n      \"method\": \"CRISPR/Cas9 knockout, RNA sequencing, cell migration/invasion/viability/apoptosis assays\",\n      \"journal\": \"Journal of Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined phenotypic readouts and transcriptomic pathway analysis, single lab\",\n      \"pmids\": [\"34234850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KTN1 is an endoplasmic reticulum protein whose expression is upregulated by ionizing radiation (IR) in keratinocytes. KTN1 depletion reduced ER expansion and downregulated UPR pathway proteins (PERK, IRE1α, ATF6), aggravating IR-induced DNA damage and suppressing cell proliferation. Reactivation of UPR (with tunicamycin) reversed the effects of KTN1 depletion, establishing that KTN1 protects keratinocytes from IR-induced DNA damage through its role in promoting the unfolded protein response.\",\n      \"method\": \"Transmission electron microscopy, immunoblotting, siRNA knockdown, pharmacological UPR inhibition (4-PBA) and activation (tunicamycin), cell proliferation assays, DNA damage readouts\",\n      \"journal\": \"Journal of dermatological science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO/KD with rescue experiment, multiple orthogonal methods (TEM, immunoblotting, pharmacological rescue), single lab\",\n      \"pmids\": [\"38448340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KTN1 (kinectin), an integral ER membrane protein, recruits the dynein adaptor CDR2 to ER sheets. Loss of CDR2 and its paralog CDR2L enhances KTN1-dependent ER sheet stacking. Exogenous CDR2 (requiring its dynein-binding CC1 box motif) reverses this stacking and promotes centrosome-proximal clustering of ER sheets, demonstrating that KTN1 organizes ER sheet architecture by serving as the membrane anchor for CDR2-dynein complexes. CDR2 competes with eEF1Bβ (translation elongation factor 1 subunit) for binding to KTN1.\",\n      \"method\": \"Biochemical assays (Co-IP/pulldown), double knockout cell lines, exogenous rescue with wild-type and CC1-box mutant CDR2, siRNA knockdown of eEF1Bβ, cell-based ER morphology assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal biochemical and cell-based methods in a single rigorous study: Co-IP, DKO phenotype, domain-specific rescue mutagenesis, competitor binding assay; establishes direct molecular mechanism\",\n      \"pmids\": [\"bio_10.1101_2024.11.06.622207\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"KTN1 (kinectin 1) is an integral endoplasmic reticulum membrane protein that organizes ER sheet architecture by recruiting the dynein adaptor CDR2 (competing with eEF1Bβ for the same binding site), thereby coupling ER sheets to cytoplasmic dynein-1; additionally, KTN1 supports the unfolded protein response (promoting ER expansion and PERK/IRE1α/ATF6 activity) to protect cells from genotoxic stress, and in the context of epithelial cancers it functions downstream of transcriptional regulators (MALAT1/c-MYC) to control EGFR protein levels and activates Rho GTPase (RAC1, RHOA, CDC42) signaling to drive cell proliferation, migration, and invasion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KTN1 (kinectin 1) is an integral endoplasmic reticulum membrane protein that organizes ER sheet architecture and links ER membranes to cytoskeletal motors [#4]. It serves as the membrane anchor for the dynein adaptor CDR2, recruiting CDR2-dynein complexes to ER sheets; loss of CDR2 and its paralog CDR2L enhances KTN1-dependent ER sheet stacking, while exogenous CDR2 bearing its dynein-binding CC1 box motif reverses stacking and clusters ER sheets near the centrosome, and CDR2 competes with the translation elongation factor subunit eEF1Bβ for the same KTN1 binding site [#4]. KTN1 also supports the unfolded protein response: its expression is induced by ionizing radiation in keratinocytes, and KTN1 depletion reduces ER expansion and lowers PERK, IRE1α, and ATF6 levels, aggravating DNA damage and suppressing proliferation in a manner reversed by pharmacological UPR reactivation [#3]. In epithelial cancers KTN1 acts downstream of transcriptional regulators to drive malignant phenotypes—it is a mediator of MALAT1/c-MYC control of EGFR protein levels in cutaneous squamous cell carcinoma [#0] and promotes proliferation, invasion, and migration through Rho GTPase (RAC1, RHOA, CDC42) signaling in bladder cancer [#1], with its loss impairing viability and arresting the cell cycle in hepatocellular carcinoma cells [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2019,\n      \"claim\": \"Established KTN1 as a functional effector node linking an oncogenic transcriptional axis to growth-factor receptor levels, answering how MALAT1/c-MYC controls EGFR.\",\n      \"evidence\": \"Transcriptomics, promoter binding and Co-IP with gain/loss-of-function in cutaneous squamous cell carcinoma cells and xenografts\",\n      \"pmids\": [\"30683916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which KTN1 raises EGFR protein but not mRNA is not defined\",\n        \"Whether this depends on KTN1's ER membrane role is untested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected KTN1 to actin-regulatory Rho GTPase signaling and identified a cis-acting lncRNA mechanism (KTN1-AS1/EP300) driving its expression, explaining how KTN1 promotes invasion.\",\n      \"evidence\": \"RIP, ChIP, and KTN1-AS1 knockdown/overexpression with proliferation/invasion/migration assays in bladder cancer models\",\n      \"pmids\": [\"33480975\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct biochemical link between KTN1 and RAC1/RHOA/CDC42 activation not resolved\",\n        \"Whether Rho activation requires the ER-anchored protein is unknown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined KTN1 as required for cancer cell cycle progression and survival, placing it within proliferation and DNA replication cascades.\",\n      \"evidence\": \"CRISPR/Cas9 knockout with RNA-seq and viability/migration/apoptosis/cell-cycle assays in Huh7 hepatocellular carcinoma cells\",\n      \"pmids\": [\"34234850\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Transcriptomic deregulation is correlative; direct targets unidentified\",\n        \"Molecular basis of G0/G1 arrest after KTN1 loss not established\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a protective ER-stress function: KTN1 promotes ER expansion and UPR signaling to limit genotoxic damage, answering how it buffers cells against ionizing radiation.\",\n      \"evidence\": \"TEM, immunoblotting, siRNA, and pharmacological UPR inhibition/activation (4-PBA/tunicamycin) with DNA damage and proliferation readouts in keratinocytes\",\n      \"pmids\": [\"38448340\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How KTN1 mechanistically activates PERK/IRE1α/ATF6 is unknown\",\n        \"Whether UPR support and cancer phenotypes share a common mechanism is untested\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved KTN1's core molecular activity—anchoring CDR2-dynein complexes to organize ER sheet architecture—and identified competitive occupancy of its binding site by eEF1Bβ.\",\n      \"evidence\": \"Co-IP/pulldown, CDR2/CDR2L double-knockout cells, CC1-box mutant rescue, and eEF1Bβ knockdown with ER morphology assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.11.06.622207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional consequence of eEF1Bβ competition for translation or ER shape not defined\",\n        \"Structural basis of the shared KTN1 binding site is unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether KTN1's ER-shaping/dynein-anchoring role mechanistically underlies its UPR-protective and pro-tumorigenic functions remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No study links the CDR2-dynein anchoring mechanism to EGFR or Rho GTPase phenotypes\",\n        \"No structural model of KTN1 binding interfaces\",\n        \"Direct biochemical bridge from KTN1 to UPR sensor activation is missing\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CDR2\", \"eEF1B\\u03b2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":2,"faith_total":2,"faith_pct":100.0}}