{"gene":"KLC3","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2001,"finding":"KLC3 interacts in vitro with the kinesin heavy chain (KHC), mediated by a conserved heptad repeat (HR) sequence, and associates in vitro with microtubules. KLC3 protein expression in mouse and rat testis is restricted to round and elongating spermatids, and KLC3 is present in sperm tails.","method":"In vitro binding assay, immunohistochemistry, subcellular fractionation","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro interaction assay plus localization data, single lab, two orthogonal methods","pmids":["11319135"],"is_preprint":false},{"year":2003,"finding":"KLC3 associates with outer dense fibers (ODFs) in sperm tails in a microtubule-independent manner. The KLC3 heptad repeat (HR) mediates binding to ODF1 (a major ODF protein) via the ODF1 leucine zipper. This interaction occurs in the absence of kinesin heavy chains or microtubules.","method":"Immunoelectron microscopy, in vitro binding assay, Co-IP/pulldown with deletion mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution with domain mutants plus immunoelectron microscopy, single lab but multiple orthogonal methods","pmids":["12594206"],"is_preprint":false},{"year":2004,"finding":"KLC3 associates with mitochondria from rat elongating spermatids via its tetratricopeptide repeat (TPR) motif. KLC3 can bind mitochondria from spermatids and somatic cells in vitro. Expression of KLC3 in fibroblasts causes formation of large KLC3 clusters near the nucleus containing mitochondria; deletion of the TPR domain abolishes mitochondrial clustering.","method":"Subcellular fractionation, in vitro binding assay, immunoelectron microscopy, expression in fibroblasts with deletion mutants","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro binding with domain deletion mutants, cell expression experiments, immunoelectron microscopy, single lab with multiple orthogonal methods","pmids":["15464570"],"is_preprint":false},{"year":2007,"finding":"In the mouse cerebellum, KLC3 protein is expressed in deep cerebellar nuclear neurons and colocalizes with endosomes and GW bodies as determined by double immunofluorescence.","method":"Immunohistochemistry, double immunofluorescence","journal":"Brain research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, immunolocalization only, no functional follow-up","pmids":["17447264"],"is_preprint":false},{"year":2012,"finding":"KLC3 binds to VDAC2 (mitochondrial outer membrane porin) as identified by co-immunoprecipitation. KLC3-induced mitochondrial aggregation in an inducible expression system is microtubule-dependent (occurs within 6h). A KLC3ΔHR mutant (lacking the heptad repeat) binds mitochondria and causes aggregation but cannot bind outer dense fibers; transgenic mice expressing this mutant show defects in midpiece mitochondrial sheath structure, reduced sperm count, and abnormal sperm motility.","method":"Co-immunoprecipitation, inducible expression system, transgenic mouse model with domain mutant, sperm parameter analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying VDAC2 as binding partner, domain mutant transgenic mouse with multiple defined phenotypic readouts, multiple orthogonal methods","pmids":["22561200"],"is_preprint":false},{"year":2016,"finding":"KLC3 is part of a multiprotein complex with LRGUK1, HOOK family proteins (HOOK1–3), and RIMBP3 at the manchette of haploid male germ cells. The LRR domain of LRGUK1 is essential for binding to KLC3. KLC3 is localized to the manchette.","method":"Yeast two-hybrid screen, validated binding interaction, immunolocalization","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid with domain mapping validated independently, single lab","pmids":["28003339"],"is_preprint":false},{"year":2022,"finding":"KLC3 interacts with CILK1 at cilia bases as shown by yeast two-hybrid and co-immunoprecipitation. KLC3 is increased in cyst-lining cells of CILK1-deficient mice. KLC3 overexpression promotes ciliary recruitment of IFT-B complex and EGFR under CILK1-deficient conditions, contributing to cystogenesis. Reduction of KLC3 rescued ciliary defects and inhibited cyst progression caused by CILK1 deficiency.","method":"Yeast two-hybrid, co-immunoprecipitation, immunocytochemistry, KLC3 knockdown/overexpression in CILK1-deficient model","journal":"Journal of the American Society of Nephrology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, yeast two-hybrid, loss-of-function with defined cellular rescue phenotype, multiple orthogonal methods in single lab","pmids":["35961787"],"is_preprint":false},{"year":2024,"finding":"Targeted mutation or complete inactivation (CRISPR/Cas9 knockout) of the KLC3 gene in mice produced no detectable change in male or female fertility, litter size, sperm count, or testis histology, calling into question the previously proposed critical role of KLC3 in mouse reproduction.","method":"CRISPR/Cas9 gene editing (knockout and domain-inactivating allele), testis histology, sperm count, fertility assays, Western blot, transcriptome analysis","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO and domain mutant KI with multiple phenotypic readouts; notable negative result explicitly contradicting prior positive claims","pmids":["37776549"],"is_preprint":false},{"year":2025,"finding":"KLC3 co-localizes and interacts with RAB11FIP5 around the basal bodies of primary cilia. KLC3 regulates axonemal glutamylation (a tubulin post-translational modification) accompanied by changes in RAB11FIP5 expression at basal bodies, contributing to anterograde ciliary trafficking. Reduction of KLC3 in ADPKD patient-derived cells decreased ciliary glutamylation, IFT88 levels, and cell proliferation.","method":"Co-immunoprecipitation, co-localization imaging, KLC3 knockdown in patient-derived cells, measurement of axonemal glutamylation","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP interaction, loss-of-function with defined molecular and cellular readouts, single lab","pmids":["41225582"],"is_preprint":false},{"year":2025,"finding":"KLC3 interacts with the fructose transporter SLC2A5 as shown by co-immunoprecipitation, potentially regulating SLC2A5 membrane localization and stability, and thereby activating MAPK signaling in gastric cancer cells. SLC2A5 overexpression rescues the inhibitory effects of KLC3 knockdown on MAPK pathway activity and EMT.","method":"Co-immunoprecipitation, transcriptome sequencing, KLC3 knockdown/rescue experiments, in vitro and in vivo functional assays","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus rescue epistasis, single lab, multiple functional assays","pmids":["41214559"],"is_preprint":false},{"year":2025,"finding":"KLC3 knockdown in ovarian cancer cells suppresses proliferation, migration, EMT, and DNA damage resistance in vitro and inhibits tumor growth in vivo. KLC3 interacts functionally with COL3A1, and COL3A1 overexpression partially reverses KLC3 knockdown-induced suppression of PI3K/AKT signaling and malignant phenotype.","method":"KLC3 knockdown, RNA-sequencing, rescue overexpression, in vitro functional assays, xenograft model","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss-of-function with rescue epistasis, multiple functional readouts, single lab","pmids":["40242978"],"is_preprint":false}],"current_model":"KLC3 is a kinesin light chain that uses its heptad repeat (HR) domain to bind ODF1 on outer dense fibers and its tetratricopeptide repeat (TPR) domain to associate with mitochondria (via VDAC2) and mediate microtubule-dependent mitochondrial aggregation during spermatid midpiece formation; it also localizes to and interacts with CILK1 at ciliary bases where it regulates IFT-B/EGFR ciliary trafficking and axonemal glutamylation via RAB11FIP5, contributing to cyst progression in polycystic kidney disease, while paradoxically its complete genetic deletion in mice produces no fertility phenotype, indicating functional redundancy or context-dependence."},"narrative":{"mechanistic_narrative":"KLC3 is a kinesin light chain expressed in haploid male germ cells that organizes cytoskeletal and mitochondrial architecture during spermatid differentiation, and that also operates at the base of primary cilia to regulate ciliary trafficking [PMID:11319135, PMID:15464570, PMID:41225582]. It binds kinesin heavy chain and microtubules through a conserved heptad repeat (HR) domain, and uses the same HR sequence to dock onto outer dense fibers via the leucine zipper of ODF1 in a microtubule- and KHC-independent manner [PMID:11319135, PMID:12594206]. Through a distinct tetratricopeptide repeat (TPR) domain it associates with mitochondria — binding the outer-membrane porin VDAC2 — and drives microtubule-dependent mitochondrial aggregation; an HR-deletion mutant that retains mitochondrial binding but cannot engage outer dense fibers disrupts the midpiece mitochondrial sheath and impairs sperm count and motility in transgenic mice [PMID:15464570, PMID:22561200]. KLC3 further resides in a manchette-associated complex with LRGUK1, HOOK1–3, and RIMBP3, with the LRGUK1 LRR domain mediating the KLC3 interaction [PMID:28003339]. At ciliary bases, KLC3 interacts with CILK1 and with RAB11FIP5, promoting anterograde IFT-B and EGFR trafficking and axonemal glutamylation; KLC3 accumulates in cyst-lining cells and its reduction rescues ciliary defects and cyst progression in CILK1-deficient and ADPKD models [PMID:35961787, PMID:41225582]. Despite these germ-cell roles, complete CRISPR/Cas9 inactivation of KLC3 in mice yields no fertility, sperm, or testis-histology phenotype, indicating functional redundancy or context-dependence in vivo [PMID:37776549].","teleology":[{"year":2001,"claim":"Established KLC3 as a bona fide kinesin light chain by showing it binds kinesin heavy chain and microtubules and is expressed specifically in differentiating spermatids, framing it as a germ-cell motor adaptor.","evidence":"In vitro binding assays, immunohistochemistry, and subcellular fractionation of mouse/rat testis","pmids":["11319135"],"confidence":"Medium","gaps":["No in vivo cargo identified","Functional consequence of KHC/microtubule binding not tested"]},{"year":2003,"claim":"Revealed a microtubule-independent role by mapping the HR domain to ODF1 binding, showing KLC3 can anchor to sperm tail outer dense fibers without kinesin or microtubules.","evidence":"Immunoelectron microscopy and in vitro binding with deletion mutants","pmids":["12594206"],"confidence":"High","gaps":["Functional role of ODF1 anchoring in sperm not demonstrated","Whether HR binds ODF1 and KHC mutually exclusively unresolved"]},{"year":2004,"claim":"Assigned a mitochondrial function to the separate TPR domain, demonstrating KLC3 can cluster mitochondria and that TPR deletion abolishes this, distinguishing two functional modules within the protein.","evidence":"Subcellular fractionation, in vitro binding, immunoelectron microscopy, and fibroblast expression with deletion mutants","pmids":["15464570"],"confidence":"High","gaps":["Direct mitochondrial receptor not yet identified","Physiological relevance to midpiece formation untested in vivo"]},{"year":2012,"claim":"Identified VDAC2 as the mitochondrial binding partner and provided in vivo evidence that the mitochondria-binding module drives midpiece mitochondrial sheath assembly, linking the two domains to sperm structure.","evidence":"Reciprocal Co-IP, inducible expression, and an HR-deletion transgenic mouse with sperm-parameter analysis","pmids":["22561200"],"confidence":"High","gaps":["Dominant-negative transgenic, not loss-of-function","Whether VDAC2 binding is required for aggregation not isolated"]},{"year":2016,"claim":"Placed KLC3 in a defined manchette multiprotein complex, expanding its germ-cell role beyond mitochondria to a cytoskeletal scaffold via LRGUK1.","evidence":"Yeast two-hybrid with domain mapping and immunolocalization in haploid germ cells","pmids":["28003339"],"confidence":"Medium","gaps":["Functional output of the complex not dissected for KLC3","Y2H interactions not all reconstituted biochemically"]},{"year":2022,"claim":"Extended KLC3 function to primary cilia by showing CILK1 interaction and demonstrating that KLC3 levels control IFT-B/EGFR ciliary recruitment and cyst progression, implicating it in polycystic kidney disease.","evidence":"Yeast two-hybrid, reciprocal Co-IP, and KLC3 knockdown/overexpression rescue in CILK1-deficient model","pmids":["35961787"],"confidence":"High","gaps":["Mechanism by which CILK1 controls KLC3 abundance unknown","Direct cargo at cilia not defined"]},{"year":2024,"claim":"Tested the in vivo requirement for KLC3 in reproduction directly, finding that complete knockout produces no fertility or sperm phenotype, contradicting the prior dominant-mutant model and revealing redundancy or context-dependence.","evidence":"CRISPR/Cas9 knockout and domain-inactivating knock-in mice with fertility, sperm, histology, and transcriptome readouts","pmids":["37776549"],"confidence":"High","gaps":["Compensating paralog or pathway not identified","Does not address ciliary/renal functions"]},{"year":2025,"claim":"Refined the ciliary mechanism by linking KLC3 to RAB11FIP5 and axonemal glutamylation, connecting KLC3 to anterograde trafficking and ADPKD cell proliferation.","evidence":"Co-IP, co-localization imaging, and KLC3 knockdown in ADPKD patient-derived cells with glutamylation/IFT88 readouts","pmids":["41225582"],"confidence":"Medium","gaps":["Whether KLC3 directly regulates the glutamylase machinery unknown","Single-lab interaction not independently confirmed"]},{"year":2025,"claim":"Implicated KLC3 in cancer signaling, showing interactions with SLC2A5 (gastric) and COL3A1 (ovarian) that drive MAPK and PI3K/AKT activity and malignant phenotypes through rescue epistasis.","evidence":"Co-IP, transcriptome sequencing, and knockdown/rescue assays in cancer cell lines and xenografts","pmids":["41214559","40242978"],"confidence":"Medium","gaps":["Direct vs indirect interactions not fully resolved","Mechanism connecting kinesin adaptor function to oncogenic signaling unclear"]},{"year":null,"claim":"It remains unresolved how KLC3 can be dispensable for mouse fertility yet retain biochemically defined germ-cell and ciliary roles, and what governs its tissue-specific cargo selection.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No identified redundant factor explaining the knockout's lack of phenotype","No structural model reconciling HR/TPR domain cargo switching","In vivo ciliary/renal requirement not tested by clean knockout"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,4]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[2,4]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,5]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[6,8]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[6,8]}],"complexes":["manchette LRGUK1-HOOK-RIMBP3 complex"],"partners":["ODF1","VDAC2","LRGUK1","CILK1","RAB11FIP5","SLC2A5","COL3A1","KIF5/KHC"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6P597","full_name":"Kinesin light chain 3","aliases":["KLC2-like","kinesin light chain 2"],"length_aa":504,"mass_kda":55.4,"function":"Kinesin is a microtubule-associated force-producing protein that may play a role in organelle transport. Plays a role during spermiogenesis in the development of the sperm tail midpiece and in the normal function of spermatozoa (By similarity). May play a role in the formation of the mitochondrial sheath formation in the developing spermatid midpiece (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q6P597/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KLC3","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"KIF5B","stoichiometry":0.2},{"gene":"KLC2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/KLC3","total_profiled":1310},"omim":[{"mim_id":"615776","title":"CILIARY ROOTLET COILED-COIL PROTEIN; CROCC","url":"https://www.omim.org/entry/615776"},{"mim_id":"601334","title":"KINESIN LIGHT CHAIN 3; KLC3","url":"https://www.omim.org/entry/601334"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Centriolar satellite","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":24.9},{"tissue":"skin 1","ntpm":99.8}],"url":"https://www.proteinatlas.org/search/KLC3"},"hgnc":{"alias_symbol":["KLC2L","KNS2B","KLCt"],"prev_symbol":[]},"alphafold":{"accession":"Q6P597","domains":[{"cath_id":"1.10.287","chopping":"20-150","consensus_level":"high","plddt":92.7811,"start":20,"end":150},{"cath_id":"1.25.40.10","chopping":"326-405_436-450","consensus_level":"medium","plddt":86.2304,"start":326,"end":450}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6P597","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6P597-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6P597-F1-predicted_aligned_error_v6.png","plddt_mean":74.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KLC3","jax_strain_url":"https://www.jax.org/strain/search?query=KLC3"},"sequence":{"accession":"Q6P597","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6P597.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6P597/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6P597"}},"corpus_meta":[{"pmid":"320198","id":"PMC_320198","title":"Escherichia 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SNP-Smoking Association Studies Needed in Controls? DNA Repair Gene Polymorphisms and Smoking Intensity.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26017978","citation_count":3,"is_preprint":false},{"pmid":"41214559","id":"PMC_41214559","title":"KLC3 drives gastric cancer progression by stabilizing SLC2A5 to activate MAPK signaling and promote epithelial-mesenchymal transition.","date":"2025","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/41214559","citation_count":2,"is_preprint":false},{"pmid":"39144966","id":"PMC_39144966","title":"Prediction and verification of benignancy and malignancy of pulmonary nodules based on inflammatory related biological markers.","date":"2024","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/39144966","citation_count":2,"is_preprint":false},{"pmid":"40994809","id":"PMC_40994809","title":"Case Report: Genomic profiling in an invasive solid papillary carcinoma patient with liver metastasis and a history of invasive lobular carcinoma.","date":"2025","source":"Pathology oncology research : POR","url":"https://pubmed.ncbi.nlm.nih.gov/40994809","citation_count":1,"is_preprint":false},{"pmid":"41225582","id":"PMC_41225582","title":"KLC3 regulates axonemal glutamylation via RAB11/FIP5 in polycystic kidney disease.","date":"2025","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/41225582","citation_count":0,"is_preprint":false},{"pmid":"41523997","id":"PMC_41523997","title":"Integrating multiple key molecules in uveal melanoma to uncover metastatic and immune microenvironment-related gene signatures.","date":"2026","source":"International journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/41523997","citation_count":0,"is_preprint":false},{"pmid":"39212356","id":"PMC_39212356","title":"[Lycium barbarum miR2911-loaded exosomes promote spermatogenic function recovery in rats with non-obstructive azoospermia by regulating Wnt/β-catenin signaling pathways].","date":"2024","source":"Zhonghua nan ke xue = National journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/39212356","citation_count":0,"is_preprint":false},{"pmid":"42098041","id":"PMC_42098041","title":"Druggable Genome-Wide Mendelian Randomization Identifies Therapeutic Targets and DNA Methylation-Mediated Regulation in Urological Malignancies.","date":"2026","source":"Technology in cancer research & treatment","url":"https://pubmed.ncbi.nlm.nih.gov/42098041","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":16759,"output_tokens":2737,"usd":0.045666,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10039,"output_tokens":3337,"usd":0.06681,"stage2_stop_reason":"end_turn"},"total_usd":0.112476,"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\": 2001,\n      \"finding\": \"KLC3 interacts in vitro with the kinesin heavy chain (KHC), mediated by a conserved heptad repeat (HR) sequence, and associates in vitro with microtubules. KLC3 protein expression in mouse and rat testis is restricted to round and elongating spermatids, and KLC3 is present in sperm tails.\",\n      \"method\": \"In vitro binding assay, immunohistochemistry, subcellular fractionation\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro interaction assay plus localization data, single lab, two orthogonal methods\",\n      \"pmids\": [\"11319135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"KLC3 associates with outer dense fibers (ODFs) in sperm tails in a microtubule-independent manner. The KLC3 heptad repeat (HR) mediates binding to ODF1 (a major ODF protein) via the ODF1 leucine zipper. This interaction occurs in the absence of kinesin heavy chains or microtubules.\",\n      \"method\": \"Immunoelectron microscopy, in vitro binding assay, Co-IP/pulldown with deletion mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution with domain mutants plus immunoelectron microscopy, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"12594206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"KLC3 associates with mitochondria from rat elongating spermatids via its tetratricopeptide repeat (TPR) motif. KLC3 can bind mitochondria from spermatids and somatic cells in vitro. Expression of KLC3 in fibroblasts causes formation of large KLC3 clusters near the nucleus containing mitochondria; deletion of the TPR domain abolishes mitochondrial clustering.\",\n      \"method\": \"Subcellular fractionation, in vitro binding assay, immunoelectron microscopy, expression in fibroblasts with deletion mutants\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro binding with domain deletion mutants, cell expression experiments, immunoelectron microscopy, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15464570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In the mouse cerebellum, KLC3 protein is expressed in deep cerebellar nuclear neurons and colocalizes with endosomes and GW bodies as determined by double immunofluorescence.\",\n      \"method\": \"Immunohistochemistry, double immunofluorescence\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, immunolocalization only, no functional follow-up\",\n      \"pmids\": [\"17447264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"KLC3 binds to VDAC2 (mitochondrial outer membrane porin) as identified by co-immunoprecipitation. KLC3-induced mitochondrial aggregation in an inducible expression system is microtubule-dependent (occurs within 6h). A KLC3ΔHR mutant (lacking the heptad repeat) binds mitochondria and causes aggregation but cannot bind outer dense fibers; transgenic mice expressing this mutant show defects in midpiece mitochondrial sheath structure, reduced sperm count, and abnormal sperm motility.\",\n      \"method\": \"Co-immunoprecipitation, inducible expression system, transgenic mouse model with domain mutant, sperm parameter analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying VDAC2 as binding partner, domain mutant transgenic mouse with multiple defined phenotypic readouts, multiple orthogonal methods\",\n      \"pmids\": [\"22561200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KLC3 is part of a multiprotein complex with LRGUK1, HOOK family proteins (HOOK1–3), and RIMBP3 at the manchette of haploid male germ cells. The LRR domain of LRGUK1 is essential for binding to KLC3. KLC3 is localized to the manchette.\",\n      \"method\": \"Yeast two-hybrid screen, validated binding interaction, immunolocalization\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid with domain mapping validated independently, single lab\",\n      \"pmids\": [\"28003339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KLC3 interacts with CILK1 at cilia bases as shown by yeast two-hybrid and co-immunoprecipitation. KLC3 is increased in cyst-lining cells of CILK1-deficient mice. KLC3 overexpression promotes ciliary recruitment of IFT-B complex and EGFR under CILK1-deficient conditions, contributing to cystogenesis. Reduction of KLC3 rescued ciliary defects and inhibited cyst progression caused by CILK1 deficiency.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, immunocytochemistry, KLC3 knockdown/overexpression in CILK1-deficient model\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, yeast two-hybrid, loss-of-function with defined cellular rescue phenotype, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"35961787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Targeted mutation or complete inactivation (CRISPR/Cas9 knockout) of the KLC3 gene in mice produced no detectable change in male or female fertility, litter size, sperm count, or testis histology, calling into question the previously proposed critical role of KLC3 in mouse reproduction.\",\n      \"method\": \"CRISPR/Cas9 gene editing (knockout and domain-inactivating allele), testis histology, sperm count, fertility assays, Western blot, transcriptome analysis\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO and domain mutant KI with multiple phenotypic readouts; notable negative result explicitly contradicting prior positive claims\",\n      \"pmids\": [\"37776549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KLC3 co-localizes and interacts with RAB11FIP5 around the basal bodies of primary cilia. KLC3 regulates axonemal glutamylation (a tubulin post-translational modification) accompanied by changes in RAB11FIP5 expression at basal bodies, contributing to anterograde ciliary trafficking. Reduction of KLC3 in ADPKD patient-derived cells decreased ciliary glutamylation, IFT88 levels, and cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, co-localization imaging, KLC3 knockdown in patient-derived cells, measurement of axonemal glutamylation\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP interaction, loss-of-function with defined molecular and cellular readouts, single lab\",\n      \"pmids\": [\"41225582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KLC3 interacts with the fructose transporter SLC2A5 as shown by co-immunoprecipitation, potentially regulating SLC2A5 membrane localization and stability, and thereby activating MAPK signaling in gastric cancer cells. SLC2A5 overexpression rescues the inhibitory effects of KLC3 knockdown on MAPK pathway activity and EMT.\",\n      \"method\": \"Co-immunoprecipitation, transcriptome sequencing, KLC3 knockdown/rescue experiments, in vitro and in vivo functional assays\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus rescue epistasis, single lab, multiple functional assays\",\n      \"pmids\": [\"41214559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KLC3 knockdown in ovarian cancer cells suppresses proliferation, migration, EMT, and DNA damage resistance in vitro and inhibits tumor growth in vivo. KLC3 interacts functionally with COL3A1, and COL3A1 overexpression partially reverses KLC3 knockdown-induced suppression of PI3K/AKT signaling and malignant phenotype.\",\n      \"method\": \"KLC3 knockdown, RNA-sequencing, rescue overexpression, in vitro functional assays, xenograft model\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss-of-function with rescue epistasis, multiple functional readouts, single lab\",\n      \"pmids\": [\"40242978\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KLC3 is a kinesin light chain that uses its heptad repeat (HR) domain to bind ODF1 on outer dense fibers and its tetratricopeptide repeat (TPR) domain to associate with mitochondria (via VDAC2) and mediate microtubule-dependent mitochondrial aggregation during spermatid midpiece formation; it also localizes to and interacts with CILK1 at ciliary bases where it regulates IFT-B/EGFR ciliary trafficking and axonemal glutamylation via RAB11FIP5, contributing to cyst progression in polycystic kidney disease, while paradoxically its complete genetic deletion in mice produces no fertility phenotype, indicating functional redundancy or context-dependence.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KLC3 is a kinesin light chain expressed in haploid male germ cells that organizes cytoskeletal and mitochondrial architecture during spermatid differentiation, and that also operates at the base of primary cilia to regulate ciliary trafficking [#0, #2, #8]. It binds kinesin heavy chain and microtubules through a conserved heptad repeat (HR) domain, and uses the same HR sequence to dock onto outer dense fibers via the leucine zipper of ODF1 in a microtubule- and KHC-independent manner [#0, #1]. Through a distinct tetratricopeptide repeat (TPR) domain it associates with mitochondria — binding the outer-membrane porin VDAC2 — and drives microtubule-dependent mitochondrial aggregation; an HR-deletion mutant that retains mitochondrial binding but cannot engage outer dense fibers disrupts the midpiece mitochondrial sheath and impairs sperm count and motility in transgenic mice [#2, #4]. KLC3 further resides in a manchette-associated complex with LRGUK1, HOOK1–3, and RIMBP3, with the LRGUK1 LRR domain mediating the KLC3 interaction [#5]. At ciliary bases, KLC3 interacts with CILK1 and with RAB11FIP5, promoting anterograde IFT-B and EGFR trafficking and axonemal glutamylation; KLC3 accumulates in cyst-lining cells and its reduction rescues ciliary defects and cyst progression in CILK1-deficient and ADPKD models [#6, #8]. Despite these germ-cell roles, complete CRISPR/Cas9 inactivation of KLC3 in mice yields no fertility, sperm, or testis-histology phenotype, indicating functional redundancy or context-dependence in vivo [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established KLC3 as a bona fide kinesin light chain by showing it binds kinesin heavy chain and microtubules and is expressed specifically in differentiating spermatids, framing it as a germ-cell motor adaptor.\",\n      \"evidence\": \"In vitro binding assays, immunohistochemistry, and subcellular fractionation of mouse/rat testis\",\n      \"pmids\": [\"11319135\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vivo cargo identified\", \"Functional consequence of KHC/microtubule binding not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Revealed a microtubule-independent role by mapping the HR domain to ODF1 binding, showing KLC3 can anchor to sperm tail outer dense fibers without kinesin or microtubules.\",\n      \"evidence\": \"Immunoelectron microscopy and in vitro binding with deletion mutants\",\n      \"pmids\": [\"12594206\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of ODF1 anchoring in sperm not demonstrated\", \"Whether HR binds ODF1 and KHC mutually exclusively unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Assigned a mitochondrial function to the separate TPR domain, demonstrating KLC3 can cluster mitochondria and that TPR deletion abolishes this, distinguishing two functional modules within the protein.\",\n      \"evidence\": \"Subcellular fractionation, in vitro binding, immunoelectron microscopy, and fibroblast expression with deletion mutants\",\n      \"pmids\": [\"15464570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mitochondrial receptor not yet identified\", \"Physiological relevance to midpiece formation untested in vivo\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified VDAC2 as the mitochondrial binding partner and provided in vivo evidence that the mitochondria-binding module drives midpiece mitochondrial sheath assembly, linking the two domains to sperm structure.\",\n      \"evidence\": \"Reciprocal Co-IP, inducible expression, and an HR-deletion transgenic mouse with sperm-parameter analysis\",\n      \"pmids\": [\"22561200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dominant-negative transgenic, not loss-of-function\", \"Whether VDAC2 binding is required for aggregation not isolated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed KLC3 in a defined manchette multiprotein complex, expanding its germ-cell role beyond mitochondria to a cytoskeletal scaffold via LRGUK1.\",\n      \"evidence\": \"Yeast two-hybrid with domain mapping and immunolocalization in haploid germ cells\",\n      \"pmids\": [\"28003339\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional output of the complex not dissected for KLC3\", \"Y2H interactions not all reconstituted biochemically\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended KLC3 function to primary cilia by showing CILK1 interaction and demonstrating that KLC3 levels control IFT-B/EGFR ciliary recruitment and cyst progression, implicating it in polycystic kidney disease.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, and KLC3 knockdown/overexpression rescue in CILK1-deficient model\",\n      \"pmids\": [\"35961787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CILK1 controls KLC3 abundance unknown\", \"Direct cargo at cilia not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Tested the in vivo requirement for KLC3 in reproduction directly, finding that complete knockout produces no fertility or sperm phenotype, contradicting the prior dominant-mutant model and revealing redundancy or context-dependence.\",\n      \"evidence\": \"CRISPR/Cas9 knockout and domain-inactivating knock-in mice with fertility, sperm, histology, and transcriptome readouts\",\n      \"pmids\": [\"37776549\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensating paralog or pathway not identified\", \"Does not address ciliary/renal functions\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the ciliary mechanism by linking KLC3 to RAB11FIP5 and axonemal glutamylation, connecting KLC3 to anterograde trafficking and ADPKD cell proliferation.\",\n      \"evidence\": \"Co-IP, co-localization imaging, and KLC3 knockdown in ADPKD patient-derived cells with glutamylation/IFT88 readouts\",\n      \"pmids\": [\"41225582\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether KLC3 directly regulates the glutamylase machinery unknown\", \"Single-lab interaction not independently confirmed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated KLC3 in cancer signaling, showing interactions with SLC2A5 (gastric) and COL3A1 (ovarian) that drive MAPK and PI3K/AKT activity and malignant phenotypes through rescue epistasis.\",\n      \"evidence\": \"Co-IP, transcriptome sequencing, and knockdown/rescue assays in cancer cell lines and xenografts\",\n      \"pmids\": [\"41214559\", \"40242978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect interactions not fully resolved\", \"Mechanism connecting kinesin adaptor function to oncogenic signaling unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how KLC3 can be dispensable for mouse fertility yet retain biochemically defined germ-cell and ciliary roles, and what governs its tissue-specific cargo selection.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No identified redundant factor explaining the knockout's lack of phenotype\", \"No structural model reconciling HR/TPR domain cargo switching\", \"In vivo ciliary/renal requirement not tested by clean knockout\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2, 4]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [6, 8]}\n    ],\n    \"complexes\": [\n      \"manchette LRGUK1-HOOK-RIMBP3 complex\"\n    ],\n    \"partners\": [\n      \"ODF1\",\n      \"VDAC2\",\n      \"LRGUK1\",\n      \"CILK1\",\n      \"RAB11FIP5\",\n      \"SLC2A5\",\n      \"COL3A1\",\n      \"KIF5/KHC\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}