{"gene":"KIF1B","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1994,"finding":"KIF1B is a monomeric, microtubule plus end-directed motor protein that transports mitochondria. Rotary shadowing electron microscopy showed mostly single globular structures (monomer). Immunocytochemistry showed colocalization with mitochondria in vivo; subcellular fractionation concentrated KIF1B in the mitochondrial fraction; and purified KIF1B transported mitochondria along microtubules in vitro.","method":"Rotary shadowing EM, immunocytochemistry, subcellular fractionation, in vitro motility assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of mitochondrial transport, structural imaging, fractionation; foundational paper with multiple orthogonal methods","pmids":["7528108"],"is_preprint":false},{"year":1999,"finding":"The Kif1b gene generates at least two major isoforms by alternative splicing: a shorter 130 kDa isoform (KIF1Bα, mitochondria-transporting) and a longer 204 kDa isoform (KIF1Bβ) with a novel C-terminal cargo-binding domain homologous to KIF1A, suggesting distinct cargo-binding specificity. Additional alternative splicing of two exons in the conserved region adjacent to the motor domain yields at least eight total isoforms.","method":"cDNA cloning, Northern blot, sequence analysis","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — molecular cloning with Northern blot validation, single lab; defines isoform structure but cargo specificity of KIF1Bβ inferred","pmids":["10571041"],"is_preprint":false},{"year":1999,"finding":"The major brain isoform of KIF1B (KIF1Bβ/p204) lacks the putative mitochondria-binding domain present in KIF1Bα, indicating it likely has a different cargo specificity from the mitochondria-transporting isoform.","method":"cDNA library screening, Northern blot, sequence analysis","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 2 — structural inference from sequence comparison confirmed by Northern blot; cargo of KIF1Bβ not directly tested","pmids":["10341097"],"is_preprint":false},{"year":2009,"finding":"Kif1b is required for the localization of mbp (myelin basic protein) mRNA to the processes of myelinating oligodendrocytes in zebrafish. Loss of Kif1b causes ectopic appearance of myelin-like membrane coincident with ectopic localization of myelin proteins in oligodendrocyte cell bodies, demonstrating a role in mRNA transport/localization rather than solely in mitochondria or synaptic vesicle transport.","method":"Zebrafish genetic mutant analysis, in situ hybridization, immunofluorescence","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function mutant with defined cellular phenotype (mRNA mislocalization, ectopic myelin), replicated in vivo","pmids":["19503091"],"is_preprint":false},{"year":2009,"finding":"Alternative splice variants of KIF1B that contain insertion sequences in the K-loop and hinge regions adjacent to the motor domain have higher microtubule-dependent ATPase activity and higher microtubule affinity than variants lacking these insertions. Motility velocity is similar between variants, indicating the insertions modulate enzymatic activity but not the rate of movement.","method":"Microtubule-dependent ATPase assay, in vitro motility assay, mutational analysis of K-loop insertion","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical reconstitution with mutagenesis, multiple assays in single study","pmids":["19744141"],"is_preprint":false},{"year":2013,"finding":"Leptin enhances the physical interaction between KIF1B and MT1-MMP (membrane type 1-matrix metalloproteinase) in gastric cancer cells (shown by co-immunoprecipitation). KIF1B knockdown by siRNA inhibits leptin-induced cell surface localization of MT1-MMP (measured by cell surface biotinylation and flow cytometry) without affecting total MT1-MMP protein levels, demonstrating that KIF1B mediates leptin-driven transport of MT1-MMP to the cell surface to promote invasion.","method":"Co-immunoprecipitation, siRNA knockdown, cell surface biotinylation, flow cytometry, transwell invasion assay","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional surface biotinylation, but single lab","pmids":["23354307"],"is_preprint":false},{"year":2015,"finding":"KIF1B promotes cell surface localization of MT1-MMP in glioma cells; siRNA-mediated KIF1B knockdown suppresses membrane MT1-MMP levels (without affecting total cell lysate levels) and inhibits glioma cell migration and invasion.","method":"siRNA knockdown, subcellular fractionation/surface MT1-MMP measurement, transwell migration/invasion assay","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2/3 — consistent with gastric cancer data; single lab, KD with defined phenotype but no direct binding shown here","pmids":["26576027"],"is_preprint":false},{"year":2016,"finding":"KIF1B interacts with KBP (KIF1-binding protein) to transport SCG10 (Stathmin-2) anterogradely to axon growth cones. Loss of Kif1b or KBP in zebrafish reduces SCG10 levels at growth cones, alters microtubule stability, and truncates axons. Axon truncation in kbp mutants is suppressed by SCG10 overexpression, placing SCG10 directly downstream of Kif1B-KBP in the pathway. Notably, loss of Kif1B or KBP did not impair mitochondrial transport in this context.","method":"Zebrafish mutant genetics, in vivo live imaging, genetic epistasis (rescue by SCG10 overexpression), microtubule stability assay","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with rescue, in vivo imaging, multiple orthogonal approaches; demonstrates cargo-specific transport role","pmids":["27358458"],"is_preprint":false},{"year":2016,"finding":"KIF1B is required for spindle assembly, chromosome congression, and mitochondrial distribution during mouse oocyte meiotic maturation and early embryonic development. KIF1B depletion (morpholino/antibody inhibition) causes abnormal polar body extrusion, disordered spindle dynamics, defects in chromosome congression, increased aneuploidy, altered mitochondrial distribution, and reduced ATP levels.","method":"Loss-of-function by morpholino depletion and antibody inhibition, immunofluorescence, confocal imaging, aneuploidy scoring in mouse oocytes","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined cellular phenotypes; single lab, mouse oocyte system","pmids":["27696585"],"is_preprint":false}],"current_model":"KIF1B is a kinesin-3 family microtubule plus end-directed motor that exists as multiple alternatively spliced isoforms: the KIF1Bα isoform functions as a monomer to transport mitochondria along microtubules, while the brain-enriched KIF1Bβ isoform (lacking the mitochondria-binding domain) transports other cargo including SCG10 (via a KBP-dependent mechanism) and MBP mRNA to axon/oligodendrocyte processes; splice variants with K-loop insertions exhibit higher ATPase activity; and KIF1B additionally mediates leptin-driven cell surface localization of MT1-MMP via direct interaction with the protease."},"narrative":{"teleology":[{"year":1994,"claim":"Identification of KIF1B as a monomeric kinesin-family motor that transports mitochondria along microtubules established the first cargo assignment and structural mode for this motor.","evidence":"Rotary shadowing EM, immunocytochemistry, subcellular fractionation, and in vitro motility reconstitution in mammalian cells","pmids":["7528108"],"confidence":"High","gaps":["Whether additional cargoes exist beyond mitochondria was unknown","Mechanism of cargo recognition and attachment not defined","In vivo loss-of-function phenotype not yet tested"]},{"year":1999,"claim":"Discovery of multiple alternatively spliced isoforms — particularly KIF1Bβ, which lacks the mitochondria-binding domain — revealed that a single gene encodes motors with distinct cargo specificities.","evidence":"cDNA cloning, Northern blot, and sequence analysis identifying at least eight splice variants including the 204 kDa KIF1Bβ isoform","pmids":["10571041","10341097"],"confidence":"Medium","gaps":["Cargo identity for KIF1Bβ not experimentally determined","Functional consequences of the multiple minor splice variants unknown","No loss-of-function data for individual isoforms"]},{"year":2009,"claim":"Demonstration that Kif1b transports MBP mRNA to oligodendrocyte processes in zebrafish established KIF1B as an mRNA transport motor critical for proper myelination, expanding its cargo repertoire beyond mitochondria.","evidence":"Zebrafish loss-of-function mutant with in situ hybridization and immunofluorescence showing mRNA mislocalization and ectopic myelin","pmids":["19503091"],"confidence":"High","gaps":["Whether mRNA transport is a direct or adaptor-mediated function not resolved","Which KIF1B isoform mediates MBP mRNA transport not formally shown","Mammalian validation not yet provided"]},{"year":2009,"claim":"Biochemical dissection of K-loop splice variants showed that insertions near the motor domain enhance ATPase activity and microtubule affinity without changing velocity, revealing a regulatory layer for motor tuning.","evidence":"In vitro ATPase assays, motility assays, and mutational analysis of K-loop insertions","pmids":["19744141"],"confidence":"High","gaps":["Physiological significance of ATPase modulation in vivo not tested","Whether K-loop variants associate with different cargoes is unknown","Structural basis of enhanced microtubule affinity not resolved"]},{"year":2013,"claim":"Identification of KIF1B as a transporter of MT1-MMP to the cell surface in response to leptin signaling extended KIF1B function to regulated membrane protein trafficking in cancer cell invasion.","evidence":"Co-immunoprecipitation, siRNA knockdown, cell surface biotinylation, and invasion assays in gastric cancer cells; replicated in glioma cells","pmids":["23354307","26576027"],"confidence":"Medium","gaps":["Direct binding domain on KIF1B for MT1-MMP not mapped","Whether this function uses KIF1Bα or KIF1Bβ is unclear","Mechanism linking leptin signaling to KIF1B-MT1-MMP interaction not defined"]},{"year":2016,"claim":"Genetic epistasis experiments established that KIF1B transports SCG10 to axon growth cones via the adaptor KBP, linking KIF1B cargo delivery to microtubule stability and axon outgrowth — and separating this function from mitochondrial transport.","evidence":"Zebrafish mutant genetics with live imaging, SCG10 overexpression rescue, and microtubule stability assays","pmids":["27358458"],"confidence":"High","gaps":["Structural basis of KIF1B–KBP interaction not resolved","Whether KBP is required for other KIF1B cargoes remains untested","Mammalian validation of the KIF1B–KBP–SCG10 axis not shown"]},{"year":2016,"claim":"KIF1B was shown to be required for spindle assembly, chromosome congression, and mitochondrial distribution during oocyte meiosis, broadening its roles beyond interphase transport.","evidence":"Morpholino and antibody-based depletion in mouse oocytes with immunofluorescence, confocal imaging, and aneuploidy scoring","pmids":["27696585"],"confidence":"Medium","gaps":["Mechanism by which KIF1B contributes to spindle assembly is unclear","Whether spindle/chromosome functions reflect direct motor activity or indirect effects of mitochondrial misdistribution not resolved","Single-lab observation not independently replicated"]},{"year":null,"claim":"Key unresolved questions include the structural basis for isoform-specific cargo recognition, the identity of adaptors linking KIF1Bβ to MBP mRNA, and whether the meiotic spindle function represents a direct mechanical role or a secondary consequence of impaired organelle distribution.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of KIF1B cargo-binding domains with their respective cargoes","RNA-binding adaptor for MBP mRNA transport not identified","In vivo relevance of KIF1B-MT1-MMP axis in non-cancer tissues unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,4]},{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[0,4]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,4,8]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,4,8]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,3,5,6,7]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,8]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,7]}],"complexes":[],"partners":["KBP","STMN2","MMP14","MBP"],"other_free_text":[]},"mechanistic_narrative":"KIF1B is a kinesin-3 family microtubule plus end-directed motor protein that functions in the intracellular transport of diverse cargoes depending on isoform identity. The KIF1Bα isoform operates as a monomer to transport mitochondria along microtubules, while the brain-enriched KIF1Bβ isoform, which lacks the mitochondria-binding domain, transports myelin basic protein (MBP) mRNA to oligodendrocyte processes and delivers SCG10 (Stathmin-2) to axon growth cones via a KBP-dependent mechanism, thereby regulating myelination and axonal outgrowth [PMID:7528108, PMID:19503091, PMID:27358458]. Alternative splicing of K-loop and hinge sequences near the motor domain modulates microtubule-dependent ATPase activity and microtubule affinity without altering motility velocity [PMID:19744141]. KIF1B additionally mediates leptin-induced cell surface trafficking of MT1-MMP, promoting cellular invasion in cancer contexts [PMID:23354307, PMID:26576027]."},"prefetch_data":{"uniprot":{"accession":"O60333","full_name":"Kinesin-like protein KIF1B","aliases":[],"length_aa":1816,"mass_kda":204.5,"function":"Has a plus-end-directed microtubule motor activity and functions as a motor for transport of vesicles and organelles along microtubules Has a plus-end-directed microtubule motor activity and functions as a motor for anterograde synaptic vesicle transport along axonal microtubules from the cell body to the presynapse in neuronal cells (By similarity). Functions as a downstream effector in a developmental apoptotic pathway that is activated when nerve growth factor (NGF) becomes limiting for neuronal progenitor cells (PubMed:18334619) Has a plus-end-directed microtubule motor activity and functions as a motor for anterograde transport of mitochondria","subcellular_location":"Mitochondrion","url":"https://www.uniprot.org/uniprotkb/O60333/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KIF1B","classification":"Not 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KIFBP","url":"https://www.omim.org/entry/609367"},{"mim_id":"609260","title":"CHARCOT-MARIE-TOOTH DISEASE, AXONAL, AUTOSOMAL DOMINANT, TYPE 2A2A; CMT2A2A","url":"https://www.omim.org/entry/609260"},{"mim_id":"608507","title":"MITOFUSIN 2; MFN2","url":"https://www.omim.org/entry/608507"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Microtubules","reliability":"Uncertain"},{"location":"Mid piece","reliability":"Uncertain"},{"location":"Principal piece","reliability":"Uncertain"},{"location":"End piece","reliability":"Uncertain"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"retina","ntpm":118.5},{"tissue":"skeletal muscle","ntpm":184.8},{"tissue":"tongue","ntpm":141.5}],"url":"https://www.proteinatlas.org/search/KIF1B"},"hgnc":{"alias_symbol":["KIAA0591","KLP","HMSNII"],"prev_symbol":["CMT2A","CMT2"]},"alphafold":{"accession":"O60333","domains":[{"cath_id":"3.40.850.10","chopping":"5-293_302-363","consensus_level":"medium","plddt":83.4187,"start":5,"end":363},{"cath_id":"-","chopping":"499-527","consensus_level":"medium","plddt":57.8093,"start":499,"end":527},{"cath_id":"2.60.200.20","chopping":"529-636","consensus_level":"medium","plddt":82.1722,"start":529,"end":636},{"cath_id":"-","chopping":"760-804_823-857","consensus_level":"medium","plddt":82.4984,"start":760,"end":857},{"cath_id":"2.60.40,2.60.210","chopping":"969-1017_1026-1044_1111-1202","consensus_level":"medium","plddt":78.7741,"start":969,"end":1202},{"cath_id":"2.60.40","chopping":"1244-1417_1436-1450_1691-1698","consensus_level":"high","plddt":83.0887,"start":1244,"end":1698},{"cath_id":"2.30.29.30","chopping":"1707-1809","consensus_level":"high","plddt":78.7963,"start":1707,"end":1809}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60333","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60333-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60333-F1-predicted_aligned_error_v6.png","plddt_mean":65.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KIF1B","jax_strain_url":"https://www.jax.org/strain/search?query=KIF1B"},"sequence":{"accession":"O60333","fasta_url":"https://rest.uniprot.org/uniprotkb/O60333.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60333/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60333"}},"corpus_meta":[{"pmid":"7528108","id":"PMC_7528108","title":"KIF1B, 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Rotary shadowing electron microscopy showed mostly single globular structures (monomer). Immunocytochemistry showed colocalization with mitochondria in vivo; subcellular fractionation concentrated KIF1B in the mitochondrial fraction; and purified KIF1B transported mitochondria along microtubules in vitro.\",\n      \"method\": \"Rotary shadowing EM, immunocytochemistry, subcellular fractionation, in vitro motility assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of mitochondrial transport, structural imaging, fractionation; foundational paper with multiple orthogonal methods\",\n      \"pmids\": [\"7528108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The Kif1b gene generates at least two major isoforms by alternative splicing: a shorter 130 kDa isoform (KIF1Bα, mitochondria-transporting) and a longer 204 kDa isoform (KIF1Bβ) with a novel C-terminal cargo-binding domain homologous to KIF1A, suggesting distinct cargo-binding specificity. Additional alternative splicing of two exons in the conserved region adjacent to the motor domain yields at least eight total isoforms.\",\n      \"method\": \"cDNA cloning, Northern blot, sequence analysis\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — molecular cloning with Northern blot validation, single lab; defines isoform structure but cargo specificity of KIF1Bβ inferred\",\n      \"pmids\": [\"10571041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The major brain isoform of KIF1B (KIF1Bβ/p204) lacks the putative mitochondria-binding domain present in KIF1Bα, indicating it likely has a different cargo specificity from the mitochondria-transporting isoform.\",\n      \"method\": \"cDNA library screening, Northern blot, sequence analysis\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — structural inference from sequence comparison confirmed by Northern blot; cargo of KIF1Bβ not directly tested\",\n      \"pmids\": [\"10341097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Kif1b is required for the localization of mbp (myelin basic protein) mRNA to the processes of myelinating oligodendrocytes in zebrafish. Loss of Kif1b causes ectopic appearance of myelin-like membrane coincident with ectopic localization of myelin proteins in oligodendrocyte cell bodies, demonstrating a role in mRNA transport/localization rather than solely in mitochondria or synaptic vesicle transport.\",\n      \"method\": \"Zebrafish genetic mutant analysis, in situ hybridization, immunofluorescence\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function mutant with defined cellular phenotype (mRNA mislocalization, ectopic myelin), replicated in vivo\",\n      \"pmids\": [\"19503091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Alternative splice variants of KIF1B that contain insertion sequences in the K-loop and hinge regions adjacent to the motor domain have higher microtubule-dependent ATPase activity and higher microtubule affinity than variants lacking these insertions. Motility velocity is similar between variants, indicating the insertions modulate enzymatic activity but not the rate of movement.\",\n      \"method\": \"Microtubule-dependent ATPase assay, in vitro motility assay, mutational analysis of K-loop insertion\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical reconstitution with mutagenesis, multiple assays in single study\",\n      \"pmids\": [\"19744141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Leptin enhances the physical interaction between KIF1B and MT1-MMP (membrane type 1-matrix metalloproteinase) in gastric cancer cells (shown by co-immunoprecipitation). KIF1B knockdown by siRNA inhibits leptin-induced cell surface localization of MT1-MMP (measured by cell surface biotinylation and flow cytometry) without affecting total MT1-MMP protein levels, demonstrating that KIF1B mediates leptin-driven transport of MT1-MMP to the cell surface to promote invasion.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, cell surface biotinylation, flow cytometry, transwell invasion assay\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional surface biotinylation, but single lab\",\n      \"pmids\": [\"23354307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KIF1B promotes cell surface localization of MT1-MMP in glioma cells; siRNA-mediated KIF1B knockdown suppresses membrane MT1-MMP levels (without affecting total cell lysate levels) and inhibits glioma cell migration and invasion.\",\n      \"method\": \"siRNA knockdown, subcellular fractionation/surface MT1-MMP measurement, transwell migration/invasion assay\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — consistent with gastric cancer data; single lab, KD with defined phenotype but no direct binding shown here\",\n      \"pmids\": [\"26576027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KIF1B interacts with KBP (KIF1-binding protein) to transport SCG10 (Stathmin-2) anterogradely to axon growth cones. Loss of Kif1b or KBP in zebrafish reduces SCG10 levels at growth cones, alters microtubule stability, and truncates axons. Axon truncation in kbp mutants is suppressed by SCG10 overexpression, placing SCG10 directly downstream of Kif1B-KBP in the pathway. Notably, loss of Kif1B or KBP did not impair mitochondrial transport in this context.\",\n      \"method\": \"Zebrafish mutant genetics, in vivo live imaging, genetic epistasis (rescue by SCG10 overexpression), microtubule stability assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with rescue, in vivo imaging, multiple orthogonal approaches; demonstrates cargo-specific transport role\",\n      \"pmids\": [\"27358458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KIF1B is required for spindle assembly, chromosome congression, and mitochondrial distribution during mouse oocyte meiotic maturation and early embryonic development. KIF1B depletion (morpholino/antibody inhibition) causes abnormal polar body extrusion, disordered spindle dynamics, defects in chromosome congression, increased aneuploidy, altered mitochondrial distribution, and reduced ATP levels.\",\n      \"method\": \"Loss-of-function by morpholino depletion and antibody inhibition, immunofluorescence, confocal imaging, aneuploidy scoring in mouse oocytes\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined cellular phenotypes; single lab, mouse oocyte system\",\n      \"pmids\": [\"27696585\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KIF1B is a kinesin-3 family microtubule plus end-directed motor that exists as multiple alternatively spliced isoforms: the KIF1Bα isoform functions as a monomer to transport mitochondria along microtubules, while the brain-enriched KIF1Bβ isoform (lacking the mitochondria-binding domain) transports other cargo including SCG10 (via a KBP-dependent mechanism) and MBP mRNA to axon/oligodendrocyte processes; splice variants with K-loop insertions exhibit higher ATPase activity; and KIF1B additionally mediates leptin-driven cell surface localization of MT1-MMP via direct interaction with the protease.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"KIF1B is a kinesin-3 family microtubule plus end-directed motor protein that functions in the intracellular transport of diverse cargoes depending on isoform identity. The KIF1Bα isoform operates as a monomer to transport mitochondria along microtubules, while the brain-enriched KIF1Bβ isoform, which lacks the mitochondria-binding domain, transports myelin basic protein (MBP) mRNA to oligodendrocyte processes and delivers SCG10 (Stathmin-2) to axon growth cones via a KBP-dependent mechanism, thereby regulating myelination and axonal outgrowth [PMID:7528108, PMID:19503091, PMID:27358458]. Alternative splicing of K-loop and hinge sequences near the motor domain modulates microtubule-dependent ATPase activity and microtubule affinity without altering motility velocity [PMID:19744141]. KIF1B additionally mediates leptin-induced cell surface trafficking of MT1-MMP, promoting cellular invasion in cancer contexts [PMID:23354307, PMID:26576027].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Identification of KIF1B as a monomeric kinesin-family motor that transports mitochondria along microtubules established the first cargo assignment and structural mode for this motor.\",\n      \"evidence\": \"Rotary shadowing EM, immunocytochemistry, subcellular fractionation, and in vitro motility reconstitution in mammalian cells\",\n      \"pmids\": [\"7528108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether additional cargoes exist beyond mitochondria was unknown\",\n        \"Mechanism of cargo recognition and attachment not defined\",\n        \"In vivo loss-of-function phenotype not yet tested\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Discovery of multiple alternatively spliced isoforms — particularly KIF1Bβ, which lacks the mitochondria-binding domain — revealed that a single gene encodes motors with distinct cargo specificities.\",\n      \"evidence\": \"cDNA cloning, Northern blot, and sequence analysis identifying at least eight splice variants including the 204 kDa KIF1Bβ isoform\",\n      \"pmids\": [\"10571041\", \"10341097\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Cargo identity for KIF1Bβ not experimentally determined\",\n        \"Functional consequences of the multiple minor splice variants unknown\",\n        \"No loss-of-function data for individual isoforms\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstration that Kif1b transports MBP mRNA to oligodendrocyte processes in zebrafish established KIF1B as an mRNA transport motor critical for proper myelination, expanding its cargo repertoire beyond mitochondria.\",\n      \"evidence\": \"Zebrafish loss-of-function mutant with in situ hybridization and immunofluorescence showing mRNA mislocalization and ectopic myelin\",\n      \"pmids\": [\"19503091\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether mRNA transport is a direct or adaptor-mediated function not resolved\",\n        \"Which KIF1B isoform mediates MBP mRNA transport not formally shown\",\n        \"Mammalian validation not yet provided\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Biochemical dissection of K-loop splice variants showed that insertions near the motor domain enhance ATPase activity and microtubule affinity without changing velocity, revealing a regulatory layer for motor tuning.\",\n      \"evidence\": \"In vitro ATPase assays, motility assays, and mutational analysis of K-loop insertions\",\n      \"pmids\": [\"19744141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Physiological significance of ATPase modulation in vivo not tested\",\n        \"Whether K-loop variants associate with different cargoes is unknown\",\n        \"Structural basis of enhanced microtubule affinity not resolved\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of KIF1B as a transporter of MT1-MMP to the cell surface in response to leptin signaling extended KIF1B function to regulated membrane protein trafficking in cancer cell invasion.\",\n      \"evidence\": \"Co-immunoprecipitation, siRNA knockdown, cell surface biotinylation, and invasion assays in gastric cancer cells; replicated in glioma cells\",\n      \"pmids\": [\"23354307\", \"26576027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding domain on KIF1B for MT1-MMP not mapped\",\n        \"Whether this function uses KIF1Bα or KIF1Bβ is unclear\",\n        \"Mechanism linking leptin signaling to KIF1B-MT1-MMP interaction not defined\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Genetic epistasis experiments established that KIF1B transports SCG10 to axon growth cones via the adaptor KBP, linking KIF1B cargo delivery to microtubule stability and axon outgrowth — and separating this function from mitochondrial transport.\",\n      \"evidence\": \"Zebrafish mutant genetics with live imaging, SCG10 overexpression rescue, and microtubule stability assays\",\n      \"pmids\": [\"27358458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of KIF1B–KBP interaction not resolved\",\n        \"Whether KBP is required for other KIF1B cargoes remains untested\",\n        \"Mammalian validation of the KIF1B–KBP–SCG10 axis not shown\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"KIF1B was shown to be required for spindle assembly, chromosome congression, and mitochondrial distribution during oocyte meiosis, broadening its roles beyond interphase transport.\",\n      \"evidence\": \"Morpholino and antibody-based depletion in mouse oocytes with immunofluorescence, confocal imaging, and aneuploidy scoring\",\n      \"pmids\": [\"27696585\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which KIF1B contributes to spindle assembly is unclear\",\n        \"Whether spindle/chromosome functions reflect direct motor activity or indirect effects of mitochondrial misdistribution not resolved\",\n        \"Single-lab observation not independently replicated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for isoform-specific cargo recognition, the identity of adaptors linking KIF1Bβ to MBP mRNA, and whether the meiotic spindle function represents a direct mechanical role or a secondary consequence of impaired organelle distribution.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model of KIF1B cargo-binding domains with their respective cargoes\",\n        \"RNA-binding adaptor for MBP mRNA transport not identified\",\n        \"In vivo relevance of KIF1B-MT1-MMP axis in non-cancer tissues unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 4, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 4, 8]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 3, 5, 6, 7]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"KBP\",\n      \"STMN2\",\n      \"MMP14\",\n      \"MBP\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}