{"gene":"KATNAL2","run_date":"2026-04-28T18:06:54","timeline":{"discoveries":[{"year":2015,"finding":"KATNAL2 exists as a family of five alternatively spliced isoforms in mouse that localize to interphase microtubules, centrioles, mitotic spindle, midbody, and axoneme/basal body of sensory cilia. shRNAi knockdown causes inefficient cytokinesis, enlarged cells and nuclei, increased centriole numbers, aberrant multipolar mitotic spindles, chromosome bridges, multinuclearity, increased MT acetylation, altered cell cycle pattern, and drastically reduced ciliogenesis. The isoforms interact with each other, with themselves, and directly with NTPases Nubp1 and Nubp2 (negative regulators of ciliogenesis and centriole duplication).","method":"shRNAi knockdown, co-immunoprecipitation, immunofluorescence localization, overexpression studies in cultured murine cells","journal":"Cellular and molecular life sciences : CMLS","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, direct localization, clean KD with multiple defined cellular phenotypes, multiple orthogonal methods in single study","pmids":["26153462"],"is_preprint":false},{"year":2016,"finding":"KATNAL2 is part of the mammalian katanin interactome (Katan-ome) as defined by mass spectrometry-based proteomics. KATNB1 (p80 regulatory subunit) can compete the interaction of KATNBL1 with KATNA1 and KATNAL1, placing KATNAL2 within a competitive regulatory network of katanin subunits.","method":"Mass spectrometry-based proteomic interaction mapping, Co-immunoprecipitation","journal":"Molecular & cellular proteomics : MCP","confidence":"Medium","confidence_rationale":"Tier 2 — MS interactome with Co-IP validation; KATNAL2 is mapped in the network but mechanistic follow-up focused on KATNBL1","pmids":["26929214"],"is_preprint":false},{"year":2016,"finding":"CRISPR-Cas9 deletion of Katnal2 in developing mouse neurons results in decreased dendritic arborization, establishing a role for KATNAL2 in neuronal morphogenesis.","method":"Retroviral CRISPR-Cas9 knockout in developing mouse neurons with morphological phenotypic readout","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype (dendritic arborization), single lab","pmids":["27161796"],"is_preprint":false},{"year":2017,"finding":"KATNAL2 plays critical roles in multiple aspects of mouse spermatogenesis: initiation of sperm tail growth from the basal body, sperm head shaping via the manchette, acrosome attachment, and sperm release. Depending on context, KATNAL2 can partner with regulatory protein KATNB1 or act autonomously. Evidence suggests KATNAL2 may regulate δ- and ε-tubulin rather than classical α-β-tubulin microtubule polymers.","method":"Mouse genetic knockout/loss-of-function model, co-immunoprecipitation, immunofluorescence, electron microscopy","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO with multiple defined cellular phenotypes and Co-IP for partner interaction, multiple orthogonal methods","pmids":["29136647"],"is_preprint":false},{"year":2018,"finding":"Katnal2 in Xenopus embryos is expressed broadly in ciliated and neurogenic tissues, localizes to basal bodies, ciliary axonemes, centrioles, and mitotic spindles, and is required for ciliogenesis and brain development in vivo.","method":"Morpholino knockdown in Xenopus embryos, immunofluorescence localization, phenotypic analysis of cilia and brain development","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo loss-of-function with direct localization and multiple defined developmental phenotypes, validated in Xenopus ortholog","pmids":["30096282"],"is_preprint":false},{"year":2020,"finding":"In Tetrahymena, the N-terminal LisH domain-containing fragment of Katnal2 (Kat2) is important for subcellular localization to basal bodies and ciliary outer doublets, dimerization, and protein stability. Co-localization with microtubular structures is sensitive to levels of microtubule glutamylation.","method":"Domain truncation/mutagenesis, immunofluorescence localization, protein stability assays in Tetrahymena","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 — domain mutagenesis with localization and stability readouts in ciliate ortholog, single lab","pmids":["31991798"],"is_preprint":false},{"year":2021,"finding":"δ- and ε-tubulin localize to the manchette during murine spermatogenesis and interact with KATNAL2, suggesting novel non-centriolar functions for both KATNAL2 and these noncanonical tubulins beyond classical α-β-tubulin microtubule regulation.","method":"Co-immunoprecipitation and immunolocalization in murine spermatogenic cells (review synthesizing primary data)","journal":"Trends in cell biology","confidence":"Medium","confidence_rationale":"Tier 3 — interaction described in review citing primary spermatogenesis data; interaction established but review format limits direct method assessment","pmids":["33867233"],"is_preprint":false},{"year":2024,"finding":"Nonsense truncation of Katnal2 (Katnal2Δ17) in mice causes ciliopathy phenotypes including impaired spermatogenesis and cerebral ventriculomegaly. KATNAL2 is highly expressed in ciliated radial glia of the fetal ventricular-subventricular zone, ependymal cells, and neurons. Loss of KATNAL2 disrupts primary cilia and ependymal planar cell polarity, impairing cilia-generated CSF flow and causing ventriculomegaly. Prefrontal pyramidal neurons show decreased excitatory drive and reduced high-frequency firing. An ASD-associated KATNAL2 F244L missense knock-in mouse recapitulates ventriculomegaly.","method":"Germline knockout mouse (Katnal2Δ17), knock-in mouse (F244L), immunofluorescence, CSF flow assays, electrophysiology, human patient variant analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 — multiple engineered mouse models, direct functional assays (CSF flow, electrophysiology), localization, and human patient variants, multiple orthogonal methods","pmids":["38916997"],"is_preprint":false},{"year":2024,"finding":"Katnal2 knockout in mice causes ASD-like social communication deficits and age-dependent progressive ventricular enlargement associated with increased length and beating frequency of motile cilia on ependymal cells (ciliary hyperfunction). Katnal2-KO hippocampal neurons show progressive synaptic deficits correlating with ASD-like transcriptomic changes (synaptic gene down-regulation). Early postnatal Katnal2 re-expression prevents ciliary, ventricular, and behavioral phenotypes, establishing a causal relationship.","method":"Knockout mouse model, cilia beating frequency measurement, behavioral assays, electrophysiology, RNA-seq transcriptomics, viral rescue (postnatal re-expression)","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple orthogonal phenotypic readouts and causal rescue experiment, multiple methods","pmids":["38718086"],"is_preprint":false},{"year":2025,"finding":"TUBD1 (delta tubulin) works in partnership with KATNAL2 and KATNB1 to regulate manchette remodeling and sperm head shaping in haploid male germ cells, as shown by conditional TUBD1 knockout mice where spermatogenesis defects phenocopy aspects of KATNAL2 loss.","method":"Conditional knockout mouse (TUBD1), co-immunoprecipitation/co-localization with KATNAL2 and KATNB1, immunofluorescence, electron microscopy","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo KO with defined phenotype and partnership evidence; KATNAL2 role inferred from partnership with TUBD1, not direct KO in this study","pmids":["40586731"],"is_preprint":false}],"current_model":"KATNAL2 is a microtubule-severing AAA ATPase (katanin family) that, depending on cellular context, partners with KATNB1 or acts autonomously to regulate microtubule dynamics at centrioles, mitotic spindles, midbodies, basal bodies, ciliary axonemes, and the manchette; it is essential for ciliogenesis, cytokinesis, cell cycle progression, spermatogenesis (sperm head shaping, tail initiation, acrosome attachment, sperm release), ependymal ciliary function and CSF flow homeostasis, dendritic arborization in developing neurons, and neuronal excitatory drive, with its N-terminal LisH domain governing dimerization and localization, and its substrates likely including δ- and ε-tubulin in addition to classical microtubule polymers."},"narrative":{"teleology":[{"year":2015,"claim":"Establishing that KATNAL2 is a multi-isoform microtubule regulator essential for ciliogenesis and cell division resolved its broad cellular roles beyond a presumed severing enzyme.","evidence":"shRNAi knockdown in cultured murine cells with immunofluorescence, co-IP, and cell cycle analysis","pmids":["26153462"],"confidence":"High","gaps":["Catalytic severing activity not directly demonstrated in vitro","Functional distinction among the five isoforms unclear","Relationship to known katanin regulatory subunits not defined"]},{"year":2016,"claim":"Placing KATNAL2 within the broader katanin interactome and showing KATNB1 competes for subunit interactions revealed a competitive regulatory network governing katanin activity.","evidence":"Mass spectrometry-based proteomic interaction mapping and co-IP","pmids":["26929214"],"confidence":"Medium","gaps":["KATNAL2-specific binding partners within the network not individually validated","Whether KATNAL2 binds KATNB1 directly or indirectly not resolved in this study","Functional consequence of competition for KATNAL2 activity unknown"]},{"year":2016,"claim":"Demonstrating that KATNAL2 loss reduces dendritic arborization established a neuronal morphogenesis function, extending its role beyond dividing and ciliated cells.","evidence":"CRISPR-Cas9 knockout in developing mouse neurons with morphological analysis","pmids":["27161796"],"confidence":"Medium","gaps":["Mechanism linking microtubule regulation to dendritic branching not identified","Not independently replicated at the time","In vivo neuronal consequences not assessed"]},{"year":2017,"claim":"Showing KATNAL2 is required for sperm tail initiation, head shaping via the manchette, acrosome attachment, and sperm release — and can act independently of KATNB1 — defined it as a central regulator of spermatogenesis with context-dependent partnerships.","evidence":"Mouse genetic knockout with co-IP, immunofluorescence, and electron microscopy","pmids":["29136647"],"confidence":"High","gaps":["Enzymatic activity on δ/ε-tubulin versus α/β-tubulin not biochemically resolved","Structural basis for KATNB1-independent function unknown","Whether KATNAL2 severs or stabilizes manchette microtubules not distinguished"]},{"year":2018,"claim":"Cross-species validation in Xenopus confirmed that KATNAL2's roles in ciliogenesis and brain development are evolutionarily conserved, strengthening it as a core ciliary and neurodevelopmental factor.","evidence":"Morpholino knockdown in Xenopus embryos with localization and developmental phenotyping","pmids":["30096282"],"confidence":"High","gaps":["Morpholino off-target effects not fully excluded","Mechanism of brain development defect not resolved","Rescue experiment not reported"]},{"year":2020,"claim":"Identifying the LisH domain as critical for dimerization, basal body targeting, and protein stability explained how KATNAL2 achieves subcellular specificity, and linked its localization to microtubule glutamylation levels.","evidence":"Domain truncation and mutagenesis with localization and stability assays in Tetrahymena","pmids":["31991798"],"confidence":"Medium","gaps":["Whether glutamylation directly recruits KATNAL2 or acts indirectly not determined","LisH domain function not validated in mammalian cells","Structural basis of LisH-mediated dimerization not solved"]},{"year":2024,"claim":"Two independent mouse studies revealed that KATNAL2 loss causes ciliopathy with ventriculomegaly, disrupted ependymal planar cell polarity and CSF flow, decreased prefrontal neuronal excitatory drive, and ASD-like behavioral deficits — with an ASD-associated human variant recapitulating brain phenotypes and postnatal rescue proving causality.","evidence":"Germline KO mice, F244L knock-in mice, CSF flow assays, electrophysiology, behavioral testing, RNA-seq, and viral rescue","pmids":["38916997","38718086"],"confidence":"High","gaps":["Whether ventriculomegaly is primarily from ciliary dysfunction or synaptic/neuronal defects not fully dissected","Molecular mechanism connecting KATNAL2 loss to altered cilia beating frequency (hyperfunction) versus ciliogenesis failure unclear","Human genetic studies confirming KATNAL2 as an ASD-causative gene are limited to single variant"]},{"year":2025,"claim":"Conditional TUBD1 knockout phenocopying aspects of KATNAL2 loss during spermatogenesis established that KATNAL2 operates in a functional complex with δ-tubulin and KATNB1 to remodel the manchette.","evidence":"Conditional TUBD1 knockout mouse with co-IP and co-localization of KATNAL2 and KATNB1","pmids":["40586731"],"confidence":"Medium","gaps":["Direct biochemical activity of KATNAL2 on δ-tubulin not demonstrated","Stoichiometry and assembly mechanism of the KATNAL2–KATNB1–TUBD1 complex unknown","Whether this partnership operates outside spermatogenesis not tested"]},{"year":null,"claim":"The core enzymatic mechanism — whether KATNAL2 severs, depolymerizes, or stabilizes microtubules, and whether it directly acts on noncanonical tubulins — remains biochemically undefined, as does the structural basis for its context-dependent KATNB1 dependence.","evidence":"","pmids":[],"confidence":"High","gaps":["No in vitro reconstitution of KATNAL2 microtubule-severing activity","No high-resolution structure of KATNAL2 or its complexes","Substrate specificity (α/β-tubulin polymers vs. δ/ε-tubulin) unresolved biochemically"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0,3,5]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,3,5]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,4,5]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,4,5]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,4,5,7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,4,7,8]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[3,9]}],"complexes":[],"partners":["KATNB1","NUBP1","NUBP2","TUBD1"],"other_free_text":[]},"mechanistic_narrative":"KATNAL2 is a katanin-family AAA ATPase that regulates microtubule dynamics at centrioles, mitotic spindles, midbodies, basal bodies, and ciliary axonemes to control ciliogenesis, cytokinesis, cell cycle progression, spermatogenesis, and neuronal development. Knockdown or knockout causes multipolar spindles, multinuclearity, increased microtubule acetylation, impaired ciliogenesis, and defective dendritic arborization, while in vivo loss produces ciliopathy phenotypes including ventriculomegaly from disrupted ependymal cilia-driven CSF flow, male infertility from failed sperm head shaping and tail initiation, and decreased cortical neuronal excitatory drive [PMID:26153462, PMID:38916997, PMID:38718086, PMID:29136647]. KATNAL2 partners with KATNB1 or acts autonomously depending on context, interacts with noncanonical δ- and ε-tubulins at the manchette during spermatogenesis, and requires its N-terminal LisH domain for dimerization, protein stability, and subcellular targeting to basal bodies and ciliary doublets [PMID:29136647, PMID:31991798, PMID:40586731]. Loss-of-function mutations in KATNAL2 cause ASD-like social communication deficits and progressive ventricular enlargement in mice, phenotypes rescued by early postnatal re-expression, and an ASD-associated human missense variant (F244L) recapitulates ventriculomegaly in knock-in mice [PMID:38718086, PMID:38916997]."},"prefetch_data":{"uniprot":{"accession":"Q8IYT4","full_name":"Katanin p60 ATPase-containing subunit A-like 2","aliases":["p60 katanin-like 2"],"length_aa":538,"mass_kda":61.3,"function":"Severs microtubules in vitro in an ATP-dependent manner. This activity may promote rapid reorganization of cellular microtubule arrays","subcellular_location":"Cytoplasm, cytoskeleton; Cytoplasm; Cytoplasm, cytoskeleton, spindle; Cytoplasm, cytoskeleton, spindle pole","url":"https://www.uniprot.org/uniprotkb/Q8IYT4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KATNAL2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KATNAL2","total_profiled":1310},"omim":[{"mim_id":"614697","title":"KATANIN, p60 SUBUNIT, A-LIKE PROTEIN 2; KATNAL2","url":"https://www.omim.org/entry/614697"},{"mim_id":"209850","title":"AUTISM","url":"https://www.omim.org/entry/209850"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Intermediate filaments","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":11.7},{"tissue":"testis","ntpm":12.2}],"url":"https://www.proteinatlas.org/search/KATNAL2"},"hgnc":{"alias_symbol":["MGC33211","DKFZP667C165"],"prev_symbol":[]},"alphafold":{"accession":"Q8IYT4","domains":[{"cath_id":"-","chopping":"2-84","consensus_level":"high","plddt":82.5655,"start":2,"end":84},{"cath_id":"3.40.50.300","chopping":"230-420","consensus_level":"high","plddt":85.9469,"start":230,"end":420},{"cath_id":"1.10.8.60","chopping":"426-489_500-521","consensus_level":"high","plddt":90.2033,"start":426,"end":521}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYT4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYT4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IYT4-F1-predicted_aligned_error_v6.png","plddt_mean":71.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KATNAL2","jax_strain_url":"https://www.jax.org/strain/search?query=KATNAL2"},"sequence":{"accession":"Q8IYT4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IYT4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IYT4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IYT4"}},"corpus_meta":[{"pmid":"22495311","id":"PMC_22495311","title":"Patterns 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drastically reduced ciliogenesis. The isoforms interact with each other, with themselves, and directly with NTPases Nubp1 and Nubp2 (negative regulators of ciliogenesis and centriole duplication).\",\n      \"method\": \"shRNAi knockdown, co-immunoprecipitation, immunofluorescence localization, overexpression studies in cultured murine cells\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, direct localization, clean KD with multiple defined cellular phenotypes, multiple orthogonal methods in single study\",\n      \"pmids\": [\"26153462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KATNAL2 is part of the mammalian katanin interactome (Katan-ome) as defined by mass spectrometry-based proteomics. KATNB1 (p80 regulatory subunit) can compete the interaction of KATNBL1 with KATNA1 and KATNAL1, placing KATNAL2 within a competitive regulatory network of katanin subunits.\",\n      \"method\": \"Mass spectrometry-based proteomic interaction mapping, Co-immunoprecipitation\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS interactome with Co-IP validation; KATNAL2 is mapped in the network but mechanistic follow-up focused on KATNBL1\",\n      \"pmids\": [\"26929214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CRISPR-Cas9 deletion of Katnal2 in developing mouse neurons results in decreased dendritic arborization, establishing a role for KATNAL2 in neuronal morphogenesis.\",\n      \"method\": \"Retroviral CRISPR-Cas9 knockout in developing mouse neurons with morphological phenotypic readout\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype (dendritic arborization), single lab\",\n      \"pmids\": [\"27161796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"KATNAL2 plays critical roles in multiple aspects of mouse spermatogenesis: initiation of sperm tail growth from the basal body, sperm head shaping via the manchette, acrosome attachment, and sperm release. Depending on context, KATNAL2 can partner with regulatory protein KATNB1 or act autonomously. Evidence suggests KATNAL2 may regulate δ- and ε-tubulin rather than classical α-β-tubulin microtubule polymers.\",\n      \"method\": \"Mouse genetic knockout/loss-of-function model, co-immunoprecipitation, immunofluorescence, electron microscopy\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO with multiple defined cellular phenotypes and Co-IP for partner interaction, multiple orthogonal methods\",\n      \"pmids\": [\"29136647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Katnal2 in Xenopus embryos is expressed broadly in ciliated and neurogenic tissues, localizes to basal bodies, ciliary axonemes, centrioles, and mitotic spindles, and is required for ciliogenesis and brain development in vivo.\",\n      \"method\": \"Morpholino knockdown in Xenopus embryos, immunofluorescence localization, phenotypic analysis of cilia and brain development\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with direct localization and multiple defined developmental phenotypes, validated in Xenopus ortholog\",\n      \"pmids\": [\"30096282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In Tetrahymena, the N-terminal LisH domain-containing fragment of Katnal2 (Kat2) is important for subcellular localization to basal bodies and ciliary outer doublets, dimerization, and protein stability. Co-localization with microtubular structures is sensitive to levels of microtubule glutamylation.\",\n      \"method\": \"Domain truncation/mutagenesis, immunofluorescence localization, protein stability assays in Tetrahymena\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain mutagenesis with localization and stability readouts in ciliate ortholog, single lab\",\n      \"pmids\": [\"31991798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"δ- and ε-tubulin localize to the manchette during murine spermatogenesis and interact with KATNAL2, suggesting novel non-centriolar functions for both KATNAL2 and these noncanonical tubulins beyond classical α-β-tubulin microtubule regulation.\",\n      \"method\": \"Co-immunoprecipitation and immunolocalization in murine spermatogenic cells (review synthesizing primary data)\",\n      \"journal\": \"Trends in cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — interaction described in review citing primary spermatogenesis data; interaction established but review format limits direct method assessment\",\n      \"pmids\": [\"33867233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Nonsense truncation of Katnal2 (Katnal2Δ17) in mice causes ciliopathy phenotypes including impaired spermatogenesis and cerebral ventriculomegaly. KATNAL2 is highly expressed in ciliated radial glia of the fetal ventricular-subventricular zone, ependymal cells, and neurons. Loss of KATNAL2 disrupts primary cilia and ependymal planar cell polarity, impairing cilia-generated CSF flow and causing ventriculomegaly. Prefrontal pyramidal neurons show decreased excitatory drive and reduced high-frequency firing. An ASD-associated KATNAL2 F244L missense knock-in mouse recapitulates ventriculomegaly.\",\n      \"method\": \"Germline knockout mouse (Katnal2Δ17), knock-in mouse (F244L), immunofluorescence, CSF flow assays, electrophysiology, human patient variant analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple engineered mouse models, direct functional assays (CSF flow, electrophysiology), localization, and human patient variants, multiple orthogonal methods\",\n      \"pmids\": [\"38916997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Katnal2 knockout in mice causes ASD-like social communication deficits and age-dependent progressive ventricular enlargement associated with increased length and beating frequency of motile cilia on ependymal cells (ciliary hyperfunction). Katnal2-KO hippocampal neurons show progressive synaptic deficits correlating with ASD-like transcriptomic changes (synaptic gene down-regulation). Early postnatal Katnal2 re-expression prevents ciliary, ventricular, and behavioral phenotypes, establishing a causal relationship.\",\n      \"method\": \"Knockout mouse model, cilia beating frequency measurement, behavioral assays, electrophysiology, RNA-seq transcriptomics, viral rescue (postnatal re-expression)\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple orthogonal phenotypic readouts and causal rescue experiment, multiple methods\",\n      \"pmids\": [\"38718086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TUBD1 (delta tubulin) works in partnership with KATNAL2 and KATNB1 to regulate manchette remodeling and sperm head shaping in haploid male germ cells, as shown by conditional TUBD1 knockout mice where spermatogenesis defects phenocopy aspects of KATNAL2 loss.\",\n      \"method\": \"Conditional knockout mouse (TUBD1), co-immunoprecipitation/co-localization with KATNAL2 and KATNB1, immunofluorescence, electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO with defined phenotype and partnership evidence; KATNAL2 role inferred from partnership with TUBD1, not direct KO in this study\",\n      \"pmids\": [\"40586731\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KATNAL2 is a microtubule-severing AAA ATPase (katanin family) that, depending on cellular context, partners with KATNB1 or acts autonomously to regulate microtubule dynamics at centrioles, mitotic spindles, midbodies, basal bodies, ciliary axonemes, and the manchette; it is essential for ciliogenesis, cytokinesis, cell cycle progression, spermatogenesis (sperm head shaping, tail initiation, acrosome attachment, sperm release), ependymal ciliary function and CSF flow homeostasis, dendritic arborization in developing neurons, and neuronal excitatory drive, with its N-terminal LisH domain governing dimerization and localization, and its substrates likely including δ- and ε-tubulin in addition to classical microtubule polymers.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"KATNAL2 is a katanin-family AAA ATPase that regulates microtubule dynamics at centrioles, mitotic spindles, midbodies, basal bodies, and ciliary axonemes to control ciliogenesis, cytokinesis, cell cycle progression, spermatogenesis, and neuronal development. Knockdown or knockout causes multipolar spindles, multinuclearity, increased microtubule acetylation, impaired ciliogenesis, and defective dendritic arborization, while in vivo loss produces ciliopathy phenotypes including ventriculomegaly from disrupted ependymal cilia-driven CSF flow, male infertility from failed sperm head shaping and tail initiation, and decreased cortical neuronal excitatory drive [PMID:26153462, PMID:38916997, PMID:38718086, PMID:29136647]. KATNAL2 partners with KATNB1 or acts autonomously depending on context, interacts with noncanonical δ- and ε-tubulins at the manchette during spermatogenesis, and requires its N-terminal LisH domain for dimerization, protein stability, and subcellular targeting to basal bodies and ciliary doublets [PMID:29136647, PMID:31991798, PMID:40586731]. Loss-of-function mutations in KATNAL2 cause ASD-like social communication deficits and progressive ventricular enlargement in mice, phenotypes rescued by early postnatal re-expression, and an ASD-associated human missense variant (F244L) recapitulates ventriculomegaly in knock-in mice [PMID:38718086, PMID:38916997].\",\n  \"teleology\": [\n    {\n      \"year\": 2015,\n      \"claim\": \"Establishing that KATNAL2 is a multi-isoform microtubule regulator essential for ciliogenesis and cell division resolved its broad cellular roles beyond a presumed severing enzyme.\",\n      \"evidence\": \"shRNAi knockdown in cultured murine cells with immunofluorescence, co-IP, and cell cycle analysis\",\n      \"pmids\": [\"26153462\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Catalytic severing activity not directly demonstrated in vitro\",\n        \"Functional distinction among the five isoforms unclear\",\n        \"Relationship to known katanin regulatory subunits not defined\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placing KATNAL2 within the broader katanin interactome and showing KATNB1 competes for subunit interactions revealed a competitive regulatory network governing katanin activity.\",\n      \"evidence\": \"Mass spectrometry-based proteomic interaction mapping and co-IP\",\n      \"pmids\": [\"26929214\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"KATNAL2-specific binding partners within the network not individually validated\",\n        \"Whether KATNAL2 binds KATNB1 directly or indirectly not resolved in this study\",\n        \"Functional consequence of competition for KATNAL2 activity unknown\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating that KATNAL2 loss reduces dendritic arborization established a neuronal morphogenesis function, extending its role beyond dividing and ciliated cells.\",\n      \"evidence\": \"CRISPR-Cas9 knockout in developing mouse neurons with morphological analysis\",\n      \"pmids\": [\"27161796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking microtubule regulation to dendritic branching not identified\",\n        \"Not independently replicated at the time\",\n        \"In vivo neuronal consequences not assessed\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing KATNAL2 is required for sperm tail initiation, head shaping via the manchette, acrosome attachment, and sperm release — and can act independently of KATNB1 — defined it as a central regulator of spermatogenesis with context-dependent partnerships.\",\n      \"evidence\": \"Mouse genetic knockout with co-IP, immunofluorescence, and electron microscopy\",\n      \"pmids\": [\"29136647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Enzymatic activity on δ/ε-tubulin versus α/β-tubulin not biochemically resolved\",\n        \"Structural basis for KATNB1-independent function unknown\",\n        \"Whether KATNAL2 severs or stabilizes manchette microtubules not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cross-species validation in Xenopus confirmed that KATNAL2's roles in ciliogenesis and brain development are evolutionarily conserved, strengthening it as a core ciliary and neurodevelopmental factor.\",\n      \"evidence\": \"Morpholino knockdown in Xenopus embryos with localization and developmental phenotyping\",\n      \"pmids\": [\"30096282\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Morpholino off-target effects not fully excluded\",\n        \"Mechanism of brain development defect not resolved\",\n        \"Rescue experiment not reported\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identifying the LisH domain as critical for dimerization, basal body targeting, and protein stability explained how KATNAL2 achieves subcellular specificity, and linked its localization to microtubule glutamylation levels.\",\n      \"evidence\": \"Domain truncation and mutagenesis with localization and stability assays in Tetrahymena\",\n      \"pmids\": [\"31991798\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether glutamylation directly recruits KATNAL2 or acts indirectly not determined\",\n        \"LisH domain function not validated in mammalian cells\",\n        \"Structural basis of LisH-mediated dimerization not solved\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Two independent mouse studies revealed that KATNAL2 loss causes ciliopathy with ventriculomegaly, disrupted ependymal planar cell polarity and CSF flow, decreased prefrontal neuronal excitatory drive, and ASD-like behavioral deficits — with an ASD-associated human variant recapitulating brain phenotypes and postnatal rescue proving causality.\",\n      \"evidence\": \"Germline KO mice, F244L knock-in mice, CSF flow assays, electrophysiology, behavioral testing, RNA-seq, and viral rescue\",\n      \"pmids\": [\"38916997\", \"38718086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether ventriculomegaly is primarily from ciliary dysfunction or synaptic/neuronal defects not fully dissected\",\n        \"Molecular mechanism connecting KATNAL2 loss to altered cilia beating frequency (hyperfunction) versus ciliogenesis failure unclear\",\n        \"Human genetic studies confirming KATNAL2 as an ASD-causative gene are limited to single variant\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Conditional TUBD1 knockout phenocopying aspects of KATNAL2 loss during spermatogenesis established that KATNAL2 operates in a functional complex with δ-tubulin and KATNB1 to remodel the manchette.\",\n      \"evidence\": \"Conditional TUBD1 knockout mouse with co-IP and co-localization of KATNAL2 and KATNB1\",\n      \"pmids\": [\"40586731\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct biochemical activity of KATNAL2 on δ-tubulin not demonstrated\",\n        \"Stoichiometry and assembly mechanism of the KATNAL2–KATNB1–TUBD1 complex unknown\",\n        \"Whether this partnership operates outside spermatogenesis not tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The core enzymatic mechanism — whether KATNAL2 severs, depolymerizes, or stabilizes microtubules, and whether it directly acts on noncanonical tubulins — remains biochemically undefined, as does the structural basis for its context-dependent KATNB1 dependence.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No in vitro reconstitution of KATNAL2 microtubule-severing activity\",\n        \"No high-resolution structure of KATNAL2 or its complexes\",\n        \"Substrate specificity (α/β-tubulin polymers vs. δ/ε-tubulin) unresolved biochemically\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0, 3, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 4, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 4, 5, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 7, 8]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [3, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"KATNB1\",\n      \"NUBP1\",\n      \"NUBP2\",\n      \"TUBD1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}