{"gene":"ASPM","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2002,"finding":"ASPM is the human ortholog of the Drosophila abnormal spindle gene (asp), which is essential for normal mitotic spindle function in embryonic neuroblasts. The mouse Aspm gene is expressed specifically in primary sites of prenatal cerebral cortical neurogenesis. ASPM proteins encode systematically larger numbers of IQ domains between flies, mice and humans, suggesting brain size is controlled in part through modulation of mitotic spindle activity in neuronal progenitor cells.","method":"Genetic mapping, mutation analysis in MCPH patients, comparative genomic/protein domain analysis, mouse expression studies","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and molecular evidence across multiple species, replicated by many subsequent labs","pmids":["12355089"],"is_preprint":false},{"year":2005,"finding":"Human ASPM protein localizes to the spindle poles during mitosis in cultured human cells, as determined by immunostaining with antibodies to both N- and C-termini. ASPM contains two N-terminal calponin-homology (CH) domains and a large block of IQ domains; the major isoform contains 81 IQ domains organized into a higher-order repeat structure.","method":"Immunostaining of cultured human cells, Western blot with peptide-specific antibodies, RT-PCR for isoform characterization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization by immunostaining replicated independently across multiple labs","pmids":["15972725"],"is_preprint":false},{"year":2005,"finding":"ASPM localizes to the centrosome in interphase and to spindle poles from prophase through telophase. siRNA-mediated downregulation of ASPM decreases protein levels of endogenous BRCA1.","method":"siRNA knockdown, immunofluorescence, Western blot","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct localization confirmed, BRCA1 reduction is single-lab, single-method observation","pmids":["16123590"],"is_preprint":false},{"year":2006,"finding":"Aspm is concentrated at mitotic spindle poles of mouse embryonic neuroepithelial (NE) cells and is down-regulated as these cells switch from proliferative to neurogenic divisions. RNAi knockdown of Aspm in telencephalic NE cells reduces Aspm at spindle poles, causes the cleavage plane to deviate from perpendicular to the ventricular surface, increases asymmetric divisions (apical membrane inherited by only one daughter), and results in reduction of the NE progenitor pool and premature neurogenesis.","method":"RNA interference in mouse embryonic brain, immunofluorescence, cleavage plane orientation analysis, BrdU/cell fate tracking","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean RNAi with specific cellular phenotype (cleavage plane, progenitor pool), replicated by subsequent studies","pmids":["16798874"],"is_preprint":false},{"year":2007,"finding":"ASPM co-localizes with citron kinase (CITK) at the midbody ring during cytokinesis in mammalian cells and embryonic neuroepithelium, and co-immunoprecipitates with CITK in HeLa cell lysates and embryonic neuroepithelium. A GFP-tagged N-terminal ASPM fragment localizes to centrosomes and spindle poles, while a C-terminal fragment localizes to midbodies. All reported microcephaly-causing ASPM mutations involve truncation or mutation of the C-terminus.","method":"Co-immunoprecipitation, GFP-fragment localization, immunofluorescence co-localization","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP demonstrated, domain localization with GFP fragments, single lab","pmids":["17534152"],"is_preprint":false},{"year":2009,"finding":"In C. elegans, ASPM-1 (the ASPM ortholog) is a novel LIN-5 (NuMA-related) binding partner. ASPM-1, together with calmodulin (CMD-1), promotes meiotic spindle organization and accumulation of LIN-5 at meiotic and mitotic spindle poles. Meiotic spindle rotation requires LIN-5, ASPM-1, CMD-1, and dynein, but is independent of the GPR-1/2/Gα cortical pathway, defining a distinct LIN-5/ASPM-1/CMD-1 spindle pole complex.","method":"Genetic epistasis in C. elegans, co-immunoprecipitation, live-cell imaging, RNAi","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis plus co-IP, multiple orthogonal methods, functional consequence demonstrated","pmids":["19219036"],"is_preprint":false},{"year":2010,"finding":"Human ASPM is a microtubule minus-end associated protein recruited in a microtubule-dependent manner to the pericentriolar matrix at spindle poles during mitosis. siRNA depletion of ASPM in U2OS cells perturbs mitotic spindle orientation, and the majority of ASPM-depleted cells fail to complete cytokinesis. A pathogenic MCPH splice-site mutation produces a variant protein lacking a tripeptide motif, dramatically reducing ASPM spindle pole localization. Expression of dominant-negative C-terminal ASPM fragments causes spindle assembly defects and cytokinesis failure. The extreme C-terminus is required for ASPM localization and function.","method":"siRNA knockdown, immunofluorescence, live-cell imaging, patient fibroblast analysis, dominant-negative fragment expression","journal":"BMC cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (siRNA, patient mutation, dominant-negative), specific functional phenotypes","pmids":["21044324"],"is_preprint":false},{"year":2010,"finding":"In Aspm mutant mice, truncated Aspm proteins fail to localize to the midbody during M-phase and cause mild microcephaly and massive germ cell loss (reduced testis/ovary size, reduced fertility). A human ASPM transgene rescues both the microcephaly and germline phenotypes, demonstrating conserved function between mouse and human ASPM.","method":"Aspm mutant mouse generation, human ASPM transgene rescue, immunofluorescence for midbody localization, histology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — transgenic rescue experiment with two distinct phenotypes, direct localization data","pmids":["20823249"],"is_preprint":false},{"year":2011,"finding":"Knockdown of Aspm in developing mouse brain results in decreased Wnt-mediated transcription, and expression of stabilized β-catenin rescues this deficit and rescues in vivo neurogenesis/migration defects caused by Aspm knockdown. ASPM acts as a positive regulator of Wnt signaling in the developing brain.","method":"In utero electroporation, Wnt reporter assay, β-catenin rescue, in vivo cortical analysis","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with pathway rescue, single lab, two orthogonal methods","pmids":["21937711"],"is_preprint":false},{"year":2011,"finding":"UBE3A (Angelman syndrome E3 ubiquitin ligase) was identified as an ASPM interactor by yeast two-hybrid screen of a human fetal brain cDNA library. Both ASPM and UBE3A localize to the centrosome. shRNA knockdown of UBE3A leads to mitotic abnormalities including chromosome missegregation and abnormal cytokinesis.","method":"Yeast two-hybrid, immunofluorescence co-localization, shRNA knockdown","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid identification only, co-IP not reported for ASPM-UBE3A interaction, single lab","pmids":["21633703"],"is_preprint":false},{"year":2012,"finding":"In mouse oocytes, ASPM localizes to the entire meiotic spindle at metaphase I and II, co-localizing with acetylated tubulin. Morpholino-mediated knockdown of ASPM causes abnormal meiotic spindle assembly and blocks meiotic progression at metaphase I with elongated spindles. Co-immunoprecipitation combined with mass spectrometry revealed that ASPM interacts with calmodulin in MI oocytes, and the two proteins co-localize at the spindle.","method":"Immunofluorescence, morpholino knockdown, co-immunoprecipitation, mass spectrometry, taxol/nocodazole treatment","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus MS for calmodulin interaction, loss-of-function with specific spindle phenotype, single lab","pmids":["23152892"],"is_preprint":false},{"year":2014,"finding":"In C. elegans oocytes, ASPM-1 (calponin-homology domain protein) is required for normal bipolar meiotic spindle pole assembly. MEI-1 (katanin) recruits ASPM-1 to the spindle and microtubule severing by MEI-1 both contribute to monopolar spindle assembly in klp-18 (kinesin-12) mutants. aspm-1 loss results in bipolar but abnormal meiotic spindles.","method":"Temperature-sensitive allele isolation, live-cell imaging, C. elegans genetics","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with live imaging, multiple alleles, single lab","pmids":["24554763"],"is_preprint":false},{"year":2015,"finding":"ASPM regulates symmetric stem cell division through an interaction with the Cdk2/Cyclin E complex. ASPM modulates Cyclin E ubiquitination, phosphorylation, and nuclear localization, thereby controlling the length of time neural progenitors spend in early G1 before traversing the restriction point, independently of mitotic spindle orientation effects.","method":"Mouse Aspm mutant model, co-immunoprecipitation, cell cycle analysis, Cyclin E ubiquitination/phosphorylation assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interaction demonstrated with co-IP and functional ubiquitination assay, single lab","pmids":["26581405"],"is_preprint":false},{"year":2015,"finding":"Aspm regulates mitosis and mitigates DNA damage during cerebellar granule neuron progenitor (CGNP) cell division. Genetic deletion of Aspm reduces cerebellar growth, increases mitotic rate, causes impaired mitotic progression, altered division orientation/differentiation, and increased DNA damage leading to progenitor apoptosis. Deletion of Aspm in Smo-induced medulloblastoma reduces tumor growth and increases DNA damage; co-deletion with Bax or Trp53 rescues neural progenitor survival.","method":"Conditional Aspm knockout mice, medulloblastoma mouse model, γ-H2AX staining, genetic epistasis with Bax/p53","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO with multiple phenotypic readouts and genetic epistasis, in vivo","pmids":["26450969"],"is_preprint":false},{"year":2016,"finding":"Aspm and Wdr62 physically interact and both localize to the proximal end of the mother centriole. Wdr62 is required for Aspm localization. Both proteins, along with Cep63, are required to localize CENPJ/CPAP/Sas-4 at centrioles. Loss of either protein causes centriole duplication defects. Aspm and Wdr62 are also required for normal apical complex localization and apical epithelial structure, promoting premature delamination and precocious differentiation of neural progenitors.","method":"Co-immunoprecipitation, immunofluorescence, mouse single and double knockouts, mass spectrometry interactome","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, genetic epistasis, multiple KO models, multiple orthogonal methods","pmids":["27974163"],"is_preprint":false},{"year":2016,"finding":"ASPM controls spindle orientation by interacting with citron kinase (CITK). ASPM recruits CITK to the spindle, and CITK overexpression rescues the spindle orientation defect caused by ASPM loss. Both ASPM and CITK affect astral microtubule organization; low doses of a microtubule-stabilizing drug revert the spindle orientation phenotype caused by their knockdown. CITK regulates both astral MT nucleation and stability.","method":"siRNA knockdown in mouse cortex and Drosophila, immunofluorescence, astral MT analysis, CITK overexpression rescue, MT-stabilizing drug treatment","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods across two species, rescue experiment, functional pathway placement","pmids":["27562601"],"is_preprint":false},{"year":2017,"finding":"ASPM forms a complex with katanin (the microcephaly-associated microtubule-severing ATPase) through conserved motifs: X-ray crystallography revealed the heterodimer of katanin p60 N-terminal and p80 C-terminal domains binds conserved motifs in ASPM. ASPM autonomously tracks growing microtubule minus ends and inhibits their growth. Katanin decorates and bends microtubule ends and potentiates ASPM minus-end blocking activity. ASPM recruits katanin along microtubules and promotes katanin-mediated microtubule severing. ASPM and katanin localize to spindle poles in a mutually dependent manner and regulate spindle flux.","method":"X-ray crystallography, reconstitution experiments, in vitro microtubule dynamics assays, immunofluorescence, mass spectrometry","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure, in vitro reconstitution, multiple orthogonal functional assays, replicated across species (fly ASPM/Asp, worm ASPM-1, human ASPM)","pmids":["28436967"],"is_preprint":false},{"year":2017,"finding":"Human ASPM functions in spindle pole organization during mitotic metaphase redundantly with CDK5RAP2. Deletion of ASPM alone does not affect spindle morphology, but when CDK5RAP2 is depleted in ASPM KO cells, spindle poles are unfocused during prometaphase and anaphase onset is significantly delayed. A hypomorphic patient mutation in ASPM similarly caused spindle pole unfocusing in the absence of CDK5RAP2.","method":"CRISPR-based gene knockout, auxin-inducible degron for CDK5RAP2 depletion, live-cell imaging, patient mutation analysis","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — CRISPR KO, conditional depletion system, patient mutation validation, multiple methods in one study","pmids":["28883092"],"is_preprint":false},{"year":2018,"finding":"Aspm knockout in ferrets causes severe microcephaly (25-40% reduction in brain weight) reflecting reduced cortical surface area without significant change in cortical thickness, mirroring human patients. Fetal Aspm KO ferret cortex displays large premature displacement of ventricular radial glial cells (vRGCs) to the outer subventricular zone where they resemble outer radial glia. This suggests ASPM regulates cortical expansion by controlling the affinity of vRGCs for the ventricular surface, modulating the ratio of vRGCs to outer radial glia.","method":"Genome editing (germline Aspm KO in ferret), histology, immunofluorescence, cortical cell type analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — germline KO in gyrencephalic species with quantitative cellular phenotype, mechanistic interpretation supported by cell-type tracing","pmids":["29643508"],"is_preprint":false},{"year":2018,"finding":"ASPM interacts with disheveled-3 (Dvl-3), a canonical upstream regulator of Wnt signaling, and inhibits its proteasome-dependent degradation, thereby increasing Dvl-3 protein stability and enabling Wnt-induced β-catenin transcriptional activity in prostate cancer cells. This mechanism maintains a cancer stem cell (ALDH+) subpopulation.","method":"Co-immunoprecipitation, proteasome inhibitor experiments, β-catenin reporter assay, siRNA knockdown, ALDH+ CSC quantification","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus proteasomal degradation assay, single lab, multiple functional readouts","pmids":["30266990"],"is_preprint":false},{"year":2008,"finding":"Hepatitis C virus NS5A protein down-regulates ASPM mRNA and protein expression via the PKR-p38 signaling pathway. NS5A represses the ASPM promoter in a dose-dependent manner; amino acid substitutions in NS5A that disrupt NS5A-PKR interaction abolish this effect. Overexpression of ASPM relieves the G2/M cell cycle block induced by NS5A, and NS5A expression causes chromosome aneuploidy.","method":"In vivo hydrodynamics-based transfection, laser capture microdissection, microarray, qPCR, Western blot, promoter reporter assay, NS5A mutants, ASPM overexpression rescue","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter with site-directed mutants, multiple assay types, single lab","pmids":["18728014"],"is_preprint":false},{"year":2011,"finding":"ASPM knockdown by siRNA impairs DNA double-strand break (DSB) repair in irradiated human cells, as shown by constant-field gel electrophoresis and γ-H2AX foci analysis, and elevates abnormal chromosomes. IR-sensitization by ASPM knockdown was not enhanced in DNA-PK-deficient glioblastoma cells, indicating ASPM impacts the DNA-PK-dependent (NHEJ) pathway.","method":"siRNA knockdown, constant-field gel electrophoresis, γ-H2AX foci analysis, clonogenic survival assay, DNA-PK-deficient cell line","journal":"International journal of radiation biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple DSB readouts plus epistasis with DNA-PK-deficient cells, single lab","pmids":["21923303"],"is_preprint":false},{"year":2021,"finding":"ASPM is recruited to DNA damage sites in a PARP2-dependent manner and interacts with BRCA1 and its E3 ligase HERC2. ASPM prevents HERC2 from accessing BRCA1, thereby protecting BRCA1 from degradation and ensuring efficient homologous recombination (HR) repair. ASPM inhibition promotes HERC2-mediated BRCA1 degradation, compromises HR efficiency and chromosome stability, and sensitizes cancer cells to ionizing radiation. Synergy between ASPM inhibition and PARP inhibition was observed.","method":"Co-immunoprecipitation, HR efficiency assay (DR-GFP reporter), γ-H2AX/RAD51 foci, ASPM siRNA, PARP inhibitor combination assay","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with BRCA1/HERC2, functional HR assay, single lab","pmids":["34142045"],"is_preprint":false},{"year":2021,"finding":"ASPM interacts with disheveled-2 (Dvl2) and antagonizes autophagy-mediated Dvl2 degradation by weakening the interaction between Dvl2 and LC3II, thereby increasing Dvl2 protein abundance and activating Wnt/β-catenin signaling in hepatocellular carcinoma cells.","method":"Co-immunoprecipitation, autophagy inhibition, LC3II interaction assay, Wnt reporter assay, siRNA knockdown, xenograft model","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with Dvl2 and LC3II, functional autophagy/degradation readout, single lab","pmids":["34428354"],"is_preprint":false},{"year":2022,"finding":"ASPM is enriched at stalled replication forks in a RAD17-dependent manner in response to replication stress. ASPM promotes RAD9 and TopBP1 loading onto chromatin, facilitating ATR-CHK1 checkpoint activation. ASPM depletion results in failed fork restart and MRE11-mediated nascent DNA degradation at stalled forks, causing chromosome instability.","method":"DNA fiber assay, iPOND (replication fork isolation), chromatin fractionation, siRNA knockdown, RAD17-dependent localization, CHK1 phosphorylation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mechanistic assays including fork isolation, chromatin loading, checkpoint activation, MRE11 epistasis, single lab but highly rigorous","pmids":["36161901"],"is_preprint":false},{"year":2023,"finding":"ASPM isoform 1 (ASPM-I1, containing exon 18) stabilizes the Hedgehog transcriptional factor GLI1 at the protein level through a unique exon-18-encoded region by competing with E3 ligases β-TrCP and CUL3, preventing GLI1 proteasomal degradation. In parallel, ASPM-I1 sustains SMO transcription through the Wnt-DVL3-β-catenin signaling axis in small cell lung cancer cells.","method":"Reporter array screening, co-immunoprecipitation, ubiquitination assay, GLI1 proteasomal degradation assay, SMO transcription analysis, in vivo xenograft","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and proteasomal competition assay for GLI1, Wnt pathway assay for SMO, single lab, isoform-specific mechanism","pmids":["36638332"],"is_preprint":false},{"year":2024,"finding":"ASPM isoform 1 (ASPM-i1) interacts with NOTCH1 intracellular domain (NICD1) and competes with FBXW7 (E3 ubiquitin ligase) binding to NICD1, blocking FBXW7-mediated polyubiquitination and proteasomal degradation of NICD1, thereby stabilizing NICD1 and activating Notch signaling in hepatocellular carcinoma cells.","method":"Co-immunoprecipitation, ubiquitination assay, FBXW7-binding-deficient NICD1 mutant, siRNA knockdown rescue, tissue co-expression analysis","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, ubiquitination assay, mutant NICD1 validation, single lab","pmids":["38279565"],"is_preprint":false},{"year":2024,"finding":"ASPM interacts with FOXM1 protein via liquid-liquid phase separation (LLPS), enhancing FOXM1 stability by preventing proteasome-mediated degradation. ASPM and FOXM1 co-occupy promoters of multiple genes (ChIP-seq). FOXM1 also transcriptionally activates ASPM expression, forming a positive feedback loop in hepatocellular carcinoma cells.","method":"LLPS assay, co-immunoprecipitation, ChIP-sequencing, proteasomal degradation assay, luciferase reporter, xenograft model","journal":"Genome biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — LLPS plus co-IP plus ChIP-seq, multiple methods, single lab","pmids":["40122889"],"is_preprint":false},{"year":2021,"finding":"ASPM interacts with KIF11 (Eg5 kinesin) in HCC cells as demonstrated by co-immunoprecipitation. ASPM in combination with KIF11 promotes HCC malignant progression via the Wnt/β-catenin signaling pathway; ASPM knockdown effects on proliferation, invasion, and migration are rescued by KIF11 overexpression.","method":"Co-immunoprecipitation, siRNA knockdown, KIF11 overexpression rescue, Western blot for Wnt pathway components","journal":"Experimental and therapeutic medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP, single lab, rescue experiment but limited mechanistic depth","pmids":["34504599"],"is_preprint":false},{"year":2023,"finding":"ASPM inhibits ubiquitin-mediated degradation of KIF11 through direct binding, stabilizing KIF11 protein in anaplastic thyroid carcinoma cells. KO of ASPM reduces KIF11 protein levels and inhibits EMT and tumor migration/invasion.","method":"Co-immunoprecipitation, ubiquitination assay, ASPM knockout (CRISPR), Western blot, xenograft model","journal":"Cell biology international","confidence":"Low","confidence_rationale":"Tier 3 / Weak — co-IP and ubiquitination assay shown, single lab, limited mechanistic detail in abstract","pmids":["36883909"],"is_preprint":false},{"year":2021,"finding":"METTL3-mediated N6-methyladenosine (m6A) modification of ASPM mRNA promotes ASPM expression in liver hepatocellular carcinoma. Silencing METTL3 suppresses HCC cell proliferation, migration, and invasion, and this is rescued by ASPM overexpression.","method":"MeRIP (m6A immunoprecipitation), METTL3 knockdown, ASPM rescue overexpression, Western blot, cell functional assays","journal":"Journal of clinical laboratory analysis","confidence":"Low","confidence_rationale":"Tier 3 / Weak — MeRIP for m6A validation, single lab, functional rescue is indirect","pmids":["34398984"],"is_preprint":false},{"year":2020,"finding":"FoxM1 transcription factor directly binds the ASPM promoter at specific sites (-236 to -230 bp and -1354 to -1348 bp) and activates ASPM transcription, as confirmed by ChIP and dual-luciferase reporter assay. ASPM mediates FoxM1-driven proliferation and migration in glioma cells.","method":"ChIP, dual-luciferase reporter assay, siRNA knockdown, FoxM1 overexpression","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter assay confirm direct promoter binding, single lab","pmids":["32667745"],"is_preprint":false}],"current_model":"ASPM is a large scaffold protein that concentrates at mitotic spindle poles and the midbody/midbody ring, where it tracks growing microtubule minus ends, inhibits their growth, recruits and is co-regulated by the microtubule-severing ATPase katanin, and works redundantly with CDK5RAP2 to focus spindle poles; it also interacts with citron kinase (CITK) to control astral microtubule organization and spindle orientation, maintains the symmetric proliferative divisions of neural progenitor cells (thereby controlling brain size), localizes to the mother centriole with WDR62 to support centriole biogenesis and apical complex integrity, modulates Wnt/β-catenin signaling by protecting Dvl proteins from degradation, regulates G1 restriction point progression through interaction with the Cdk2/Cyclin E complex, and participates in DNA double-strand break repair (NHEJ and HR via BRCA1 stabilization) and replication stress response (ATR-CHK1 activation at stalled forks via RAD17-RAD9/TopBP1 loading), while in cancer contexts its isoform 1 additionally stabilizes GLI1 (Hedgehog), NICD1 (Notch), and FOXM1 by competing with their E3 ubiquitin ligases."},"narrative":{"mechanistic_narrative":"ASPM is a large IQ-domain scaffold protein that controls mitotic spindle organization in neural progenitors and thereby sets cerebral cortical size, originally identified as the human ortholog of Drosophila abnormal spindle and as a recurrent cause of autosomal recessive primary microcephaly (MCPH) [PMID:12355089, PMID:21044324]. It concentrates at centrosomes/spindle poles in interphase and mitosis and at the midbody during cytokinesis, with its N-terminus directing centrosomal/spindle-pole localization and its disease-critical C-terminus directing midbody localization [PMID:15972725, PMID:17534152]. Mechanistically, ASPM autonomously tracks growing microtubule minus ends and inhibits their growth; it forms a structurally defined complex with the severing ATPase katanin (p60/p80), mutually depends on katanin for spindle-pole accumulation, and recruits katanin to promote microtubule severing and spindle flux [PMID:28436967]. It focuses spindle poles redundantly with CDK5RAP2 [PMID:28883092] and organizes astral microtubules and spindle orientation through citron kinase, which it recruits to the spindle [PMID:27562601]. ASPM maintains the symmetric proliferative divisions and ventricular-surface affinity of radial glia, so its loss shifts progenitors toward premature neurogenic/asymmetric divisions and reduces cortical surface area in mouse and ferret models [PMID:16798874, PMID:29643508]. Beyond spindle architecture, ASPM associates with WDR62 at the mother centriole to support centriole biogenesis and apical complex integrity [PMID:27974163], gates G1/S progression via the Cdk2/Cyclin E complex [PMID:26581405], and is essential for germline development, with a human ASPM transgene rescuing mouse microcephaly and germ-cell loss [PMID:20823249]. ASPM additionally functions in genome maintenance: it acts in DNA-PK-dependent double-strand-break repair, protects BRCA1 from HERC2-mediated degradation to sustain homologous recombination, and is loaded at stalled replication forks in a RAD17-dependent manner to promote RAD9/TopBP1 chromatin loading and ATR-CHK1 checkpoint activation [PMID:21923303, PMID:34142045, PMID:36161901]. In cancer, ASPM (notably exon-18-containing isoform 1) stabilizes oncogenic effectors by competing with their E3 ligases or autophagic turnover, including Dishevelled proteins to potentiate Wnt/β-catenin signaling, GLI1, NICD1, and FOXM1 [PMID:30266990, PMID:34428354, PMID:36638332, PMID:38279565, PMID:40122889].","teleology":[{"year":2002,"claim":"Established ASPM's identity and the founding hypothesis that brain size is governed by spindle activity in neuronal progenitors, by linking it to MCPH and to the Drosophila spindle gene asp.","evidence":"Genetic mapping and mutation analysis in microcephaly patients with comparative protein-domain and mouse expression analysis","pmids":["12355089"],"confidence":"High","gaps":["No biochemical activity or direct partner defined","Mechanism connecting spindle function to progenitor fate not yet shown"]},{"year":2005,"claim":"Localized ASPM to centrosomes and spindle poles and mapped its domain architecture (CH domains plus ~81 IQ repeats), placing it physically at the mitotic apparatus.","evidence":"Immunostaining of cultured human cells with N- and C-terminal antibodies plus isoform RT-PCR","pmids":["15972725"],"confidence":"High","gaps":["Function of IQ repeats and CH domains untested","No interacting partner identified"]},{"year":2006,"claim":"Connected ASPM spindle-pole localization to cell-fate by showing its loss reorients the cleavage plane and depletes the progenitor pool, linking spindle orientation to neurogenesis.","evidence":"RNAi in mouse embryonic neuroepithelium with cleavage-plane and cell-fate tracking","pmids":["16798874"],"confidence":"High","gaps":["Molecular mechanism of spindle-pole anchoring unknown","Direct microtubule activity not demonstrated"]},{"year":2007,"claim":"Resolved a functional division of labor within ASPM and added citron kinase as a midbody partner, explaining why C-terminal truncations are pathogenic.","evidence":"Reciprocal co-IP with CITK and GFP-fragment localization in HeLa and neuroepithelium","pmids":["17534152"],"confidence":"Medium","gaps":["Functional consequence of the CITK interaction not yet tested","Single lab"]},{"year":2009,"claim":"Defined a conserved spindle-pole module (LIN-5/ASPM-1/calmodulin) acting through dynein independently of cortical Gα signaling, generalizing ASPM's spindle-pole role to meiosis.","evidence":"C. elegans genetic epistasis, co-IP, and live imaging","pmids":["19219036"],"confidence":"High","gaps":["Direct human orthology of the LIN-5 partnership not shown","Biochemical mechanism of pole accumulation unresolved"]},{"year":2010,"claim":"Showed ASPM is a microtubule-dependent minus-end-associated pericentriolar protein required for spindle orientation and cytokinesis, and that its extreme C-terminus is essential, providing mechanistic basis for MCPH mutations.","evidence":"siRNA, live imaging, patient-fibroblast and dominant-negative fragment analysis in U2OS; transgenic mouse rescue with human ASPM","pmids":["21044324","20823249"],"confidence":"High","gaps":["Direct microtubule-binding biochemistry not yet reconstituted","Mechanism of minus-end recognition unknown"]},{"year":2011,"claim":"Extended ASPM beyond the spindle by linking it to Wnt signaling, BRCA1 stability, DSB repair, and a UBE3A interaction, suggesting multifunctional roles.","evidence":"In utero electroporation with Wnt reporter/β-catenin rescue; siRNA with γ-H2AX and DNA-PK-deficient cells; yeast two-hybrid for UBE3A","pmids":["21937711","21923303","21633703","16123590"],"confidence":"Medium","gaps":["UBE3A interaction lacks reciprocal co-IP (Low confidence)","Direct molecular link between ASPM and Wnt machinery not yet defined","BRCA1 reduction was single-method observation"]},{"year":2015,"claim":"Separated ASPM's spindle-orientation function from a distinct cell-cycle role, showing it gates G1 restriction-point timing via Cyclin E and mitigates DNA damage in dividing progenitors.","evidence":"Mouse Aspm mutants, co-IP, Cyclin E ubiquitination/phosphorylation assays; conditional KO with γ-H2AX and Bax/p53 epistasis in cerebellar progenitors and medulloblastoma","pmids":["26581405","26450969"],"confidence":"High","gaps":["How ASPM modulates Cyclin E ubiquitination biochemically unresolved","Link between mitotic and DNA-damage functions unclear"]},{"year":2016,"claim":"Placed ASPM into two cortical-development modules: a centriolar WDR62 complex for centriole biogenesis and apical integrity, and a CITK-dependent astral-microtubule pathway controlling spindle orientation.","evidence":"Reciprocal co-IP, mass spectrometry, single/double KO mice for WDR62; cross-species siRNA, rescue, and MT-drug treatment for CITK","pmids":["27974163","27562601"],"confidence":"High","gaps":["Hierarchy among centriolar partners only partly resolved","Direct astral MT-regulating activity of ASPM not biochemically isolated"]},{"year":2017,"claim":"Provided the definitive biochemical mechanism: ASPM tracks and blocks microtubule minus-end growth and forms a structurally defined complex with katanin to control severing and spindle flux, and focuses poles redundantly with CDK5RAP2.","evidence":"X-ray crystallography, in vitro reconstitution and MT-dynamics assays; CRISPR KO with auxin-degron CDK5RAP2 depletion and patient-mutation validation","pmids":["28436967","28883092"],"confidence":"High","gaps":["How minus-end tracking integrates with pole focusing in vivo not fully mapped","Redundancy partners beyond CDK5RAP2 unexplored"]},{"year":2018,"claim":"Demonstrated in a gyrencephalic species that ASPM expands cortex by controlling radial-glia attachment to the ventricular surface, and refined its prostate-cancer Wnt role to Dishevelled stabilization.","evidence":"Germline Aspm KO ferret with cortical cell-type tracing; co-IP, proteasome inhibition and β-catenin reporter for Dvl-3","pmids":["29643508","30266990"],"confidence":"High","gaps":["Molecular signal linking spindle/centriole function to surface affinity unknown","How ASPM shields Dvl-3 from the proteasome not defined"]},{"year":2022,"claim":"Defined ASPM's genome-maintenance mechanism at forks and breaks, showing RAD17-dependent fork loading driving ATR-CHK1 activation and BRCA1 protection from HERC2 to sustain homologous recombination.","evidence":"iPOND, DNA fiber, chromatin fractionation and CHK1 assays; co-IP with BRCA1/HERC2 and DR-GFP HR reporter with PARPi synergy","pmids":["36161901","34142045"],"confidence":"High","gaps":["How a spindle-pole protein is recruited to chromatin/forks structurally unclear","Relationship between mitotic and DNA-repair pools of ASPM unresolved"]},{"year":2024,"claim":"Elaborated a recurring oncogenic theme in which ASPM (often exon-18 isoform 1) stabilizes oncoproteins by competing with their degradation machinery, spanning GLI1, NICD1, FOXM1, and Dvl2.","evidence":"Co-IP, ubiquitination and proteasomal/autophagic degradation assays, LLPS, ChIP-seq, and xenografts across SCLC, HCC, and glioma","pmids":["36638332","38279565","40122889","34428354","32667745"],"confidence":"Medium","gaps":["Whether E3-ligase competition reflects a single shared biochemical mechanism unknown","Several interactions are single-lab co-IP based","Isoform-specificity not validated across all targets"]},{"year":null,"claim":"It remains unresolved how ASPM's defined microtubule minus-end/katanin activity mechanistically connects to its diverse non-spindle functions (Cyclin E gating, fork/break repair, Wnt and oncoprotein stabilization), and whether these reflect distinct protein pools or a unifying scaffolding principle.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking the IQ-repeat scaffold to its many partners","Isoform-specific functional partitioning incompletely mapped","Mechanism of chromatin/fork recruitment of a centrosomal protein undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[6,16]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,15,16,17]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[16,22,24]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1,2,6,14]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[6,10,16]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[22,24]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,6,12,17]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[21,22,24]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,19,25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,18]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[14]}],"complexes":["ASPM-katanin (p60/p80) complex","ASPM-WDR62 centriolar complex","LIN-5/ASPM-1/calmodulin spindle-pole complex"],"partners":["KATNA1","CDK5RAP2","WDR62","CIT","BRCA1","HERC2","CCNE1","DVL3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IZT6","full_name":"Abnormal spindle-like microcephaly-associated protein","aliases":["Abnormal spindle protein homolog","Asp homolog"],"length_aa":3477,"mass_kda":409.8,"function":"Involved in mitotic spindle regulation and coordination of mitotic processes. 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WDR62","url":"https://www.omim.org/entry/613583"},{"mim_id":"612703","title":"MICROCEPHALY 7, PRIMARY, AUTOSOMAL RECESSIVE; MCPH7","url":"https://www.omim.org/entry/612703"},{"mim_id":"608716","title":"MICROCEPHALY 5, PRIMARY, AUTOSOMAL RECESSIVE; MCPH5","url":"https://www.omim.org/entry/608716"},{"mim_id":"607117","title":"MICROCEPHALIN 1; MCPH1","url":"https://www.omim.org/entry/607117"},{"mim_id":"605481","title":"ABNORMAL SPINDLE-LIKE, MICROCEPHALY-ASSOCIATED; ASPM","url":"https://www.omim.org/entry/605481"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"bone marrow","ntpm":9.5},{"tissue":"lymphoid 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Sequencing Identifies Three Novel Mutations in the ASPM Gene From Saudi Families Leading to Primary Microcephaly.","date":"2021","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/33643967","citation_count":18,"is_preprint":false},{"pmid":"36980263","id":"PMC_36980263","title":"The Multiple Mitotic Roles of the ASPM Orthologous Proteins: Insight into the Etiology of ASPM-Dependent Microcephaly.","date":"2023","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/36980263","citation_count":17,"is_preprint":false},{"pmid":"25796627","id":"PMC_25796627","title":"Enhancement of tumor initiation and expression of KCNMA1, MORF4L2 and ASPM genes in the adenocarcinoma of lung xenograft after vorinostat treatment.","date":"2015","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/25796627","citation_count":17,"is_preprint":false},{"pmid":"34504599","id":"PMC_34504599","title":"ASPM combined with KIF11 promotes the malignant progression of hepatocellular 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CR","url":"https://pubmed.ncbi.nlm.nih.gov/38576051","citation_count":11,"is_preprint":false},{"pmid":"36883909","id":"PMC_36883909","title":"ASPM promotes migration and invasion of anaplastic thyroid carcinoma by stabilizing KIF11.","date":"2023","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/36883909","citation_count":11,"is_preprint":false},{"pmid":"35035405","id":"PMC_35035405","title":"Whole exome sequencing identifies a novel mutation in ASPM and ultra-rare mutation in CDK5RAP2 causing Primary microcephaly in consanguineous Pakistani families.","date":"2022","source":"Pakistan journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35035405","citation_count":11,"is_preprint":false},{"pmid":"29644084","id":"PMC_29644084","title":"Primary microcephaly caused by novel compound heterozygous mutations in ASPM.","date":"2018","source":"Human genome variation","url":"https://pubmed.ncbi.nlm.nih.gov/29644084","citation_count":11,"is_preprint":false},{"pmid":"34295862","id":"PMC_34295862","title":"Updates on Clinical and Genetic Heterogeneity of ASPM in 12 Autosomal Recessive Primary Microcephaly Families in Pakistani Population.","date":"2021","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/34295862","citation_count":10,"is_preprint":false},{"pmid":"34042518","id":"PMC_34042518","title":"ASPM is a Novel Candidate Gene Associated with Colorectal Cancer Cell Growth.","date":"2021","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/34042518","citation_count":9,"is_preprint":false},{"pmid":"38279565","id":"PMC_38279565","title":"ASPM stabilizes the NOTCH intracellular domain 1 and promotes oncogenesis by blocking FBXW7 binding in hepatocellular carcinoma cells.","date":"2024","source":"Molecular 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syndromology","url":"https://pubmed.ncbi.nlm.nih.gov/36588751","citation_count":6,"is_preprint":false},{"pmid":"29253521","id":"PMC_29253521","title":"Longitudinal Diffusion Tensor Imaging Revealed Nerve Fiber Alterations in Aspm Mutated Microcephaly Model Mice.","date":"2017","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/29253521","citation_count":6,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46785,"output_tokens":8284,"usd":0.132307,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18036,"output_tokens":4950,"usd":0.106965,"stage2_stop_reason":"end_turn"},"total_usd":0.239272,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"ASPM is the human ortholog of the Drosophila abnormal spindle gene (asp), which is essential for normal mitotic spindle function in embryonic neuroblasts. The mouse Aspm gene is expressed specifically in primary sites of prenatal cerebral cortical neurogenesis. ASPM proteins encode systematically larger numbers of IQ domains between flies, mice and humans, suggesting brain size is controlled in part through modulation of mitotic spindle activity in neuronal progenitor cells.\",\n      \"method\": \"Genetic mapping, mutation analysis in MCPH patients, comparative genomic/protein domain analysis, mouse expression studies\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and molecular evidence across multiple species, replicated by many subsequent labs\",\n      \"pmids\": [\"12355089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Human ASPM protein localizes to the spindle poles during mitosis in cultured human cells, as determined by immunostaining with antibodies to both N- and C-termini. ASPM contains two N-terminal calponin-homology (CH) domains and a large block of IQ domains; the major isoform contains 81 IQ domains organized into a higher-order repeat structure.\",\n      \"method\": \"Immunostaining of cultured human cells, Western blot with peptide-specific antibodies, RT-PCR for isoform characterization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization by immunostaining replicated independently across multiple labs\",\n      \"pmids\": [\"15972725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ASPM localizes to the centrosome in interphase and to spindle poles from prophase through telophase. siRNA-mediated downregulation of ASPM decreases protein levels of endogenous BRCA1.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, Western blot\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization confirmed, BRCA1 reduction is single-lab, single-method observation\",\n      \"pmids\": [\"16123590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Aspm is concentrated at mitotic spindle poles of mouse embryonic neuroepithelial (NE) cells and is down-regulated as these cells switch from proliferative to neurogenic divisions. RNAi knockdown of Aspm in telencephalic NE cells reduces Aspm at spindle poles, causes the cleavage plane to deviate from perpendicular to the ventricular surface, increases asymmetric divisions (apical membrane inherited by only one daughter), and results in reduction of the NE progenitor pool and premature neurogenesis.\",\n      \"method\": \"RNA interference in mouse embryonic brain, immunofluorescence, cleavage plane orientation analysis, BrdU/cell fate tracking\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean RNAi with specific cellular phenotype (cleavage plane, progenitor pool), replicated by subsequent studies\",\n      \"pmids\": [\"16798874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ASPM co-localizes with citron kinase (CITK) at the midbody ring during cytokinesis in mammalian cells and embryonic neuroepithelium, and co-immunoprecipitates with CITK in HeLa cell lysates and embryonic neuroepithelium. A GFP-tagged N-terminal ASPM fragment localizes to centrosomes and spindle poles, while a C-terminal fragment localizes to midbodies. All reported microcephaly-causing ASPM mutations involve truncation or mutation of the C-terminus.\",\n      \"method\": \"Co-immunoprecipitation, GFP-fragment localization, immunofluorescence co-localization\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP demonstrated, domain localization with GFP fragments, single lab\",\n      \"pmids\": [\"17534152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In C. elegans, ASPM-1 (the ASPM ortholog) is a novel LIN-5 (NuMA-related) binding partner. ASPM-1, together with calmodulin (CMD-1), promotes meiotic spindle organization and accumulation of LIN-5 at meiotic and mitotic spindle poles. Meiotic spindle rotation requires LIN-5, ASPM-1, CMD-1, and dynein, but is independent of the GPR-1/2/Gα cortical pathway, defining a distinct LIN-5/ASPM-1/CMD-1 spindle pole complex.\",\n      \"method\": \"Genetic epistasis in C. elegans, co-immunoprecipitation, live-cell imaging, RNAi\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis plus co-IP, multiple orthogonal methods, functional consequence demonstrated\",\n      \"pmids\": [\"19219036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human ASPM is a microtubule minus-end associated protein recruited in a microtubule-dependent manner to the pericentriolar matrix at spindle poles during mitosis. siRNA depletion of ASPM in U2OS cells perturbs mitotic spindle orientation, and the majority of ASPM-depleted cells fail to complete cytokinesis. A pathogenic MCPH splice-site mutation produces a variant protein lacking a tripeptide motif, dramatically reducing ASPM spindle pole localization. Expression of dominant-negative C-terminal ASPM fragments causes spindle assembly defects and cytokinesis failure. The extreme C-terminus is required for ASPM localization and function.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, live-cell imaging, patient fibroblast analysis, dominant-negative fragment expression\",\n      \"journal\": \"BMC cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (siRNA, patient mutation, dominant-negative), specific functional phenotypes\",\n      \"pmids\": [\"21044324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In Aspm mutant mice, truncated Aspm proteins fail to localize to the midbody during M-phase and cause mild microcephaly and massive germ cell loss (reduced testis/ovary size, reduced fertility). A human ASPM transgene rescues both the microcephaly and germline phenotypes, demonstrating conserved function between mouse and human ASPM.\",\n      \"method\": \"Aspm mutant mouse generation, human ASPM transgene rescue, immunofluorescence for midbody localization, histology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transgenic rescue experiment with two distinct phenotypes, direct localization data\",\n      \"pmids\": [\"20823249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Knockdown of Aspm in developing mouse brain results in decreased Wnt-mediated transcription, and expression of stabilized β-catenin rescues this deficit and rescues in vivo neurogenesis/migration defects caused by Aspm knockdown. ASPM acts as a positive regulator of Wnt signaling in the developing brain.\",\n      \"method\": \"In utero electroporation, Wnt reporter assay, β-catenin rescue, in vivo cortical analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with pathway rescue, single lab, two orthogonal methods\",\n      \"pmids\": [\"21937711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"UBE3A (Angelman syndrome E3 ubiquitin ligase) was identified as an ASPM interactor by yeast two-hybrid screen of a human fetal brain cDNA library. Both ASPM and UBE3A localize to the centrosome. shRNA knockdown of UBE3A leads to mitotic abnormalities including chromosome missegregation and abnormal cytokinesis.\",\n      \"method\": \"Yeast two-hybrid, immunofluorescence co-localization, shRNA knockdown\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid identification only, co-IP not reported for ASPM-UBE3A interaction, single lab\",\n      \"pmids\": [\"21633703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In mouse oocytes, ASPM localizes to the entire meiotic spindle at metaphase I and II, co-localizing with acetylated tubulin. Morpholino-mediated knockdown of ASPM causes abnormal meiotic spindle assembly and blocks meiotic progression at metaphase I with elongated spindles. Co-immunoprecipitation combined with mass spectrometry revealed that ASPM interacts with calmodulin in MI oocytes, and the two proteins co-localize at the spindle.\",\n      \"method\": \"Immunofluorescence, morpholino knockdown, co-immunoprecipitation, mass spectrometry, taxol/nocodazole treatment\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus MS for calmodulin interaction, loss-of-function with specific spindle phenotype, single lab\",\n      \"pmids\": [\"23152892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In C. elegans oocytes, ASPM-1 (calponin-homology domain protein) is required for normal bipolar meiotic spindle pole assembly. MEI-1 (katanin) recruits ASPM-1 to the spindle and microtubule severing by MEI-1 both contribute to monopolar spindle assembly in klp-18 (kinesin-12) mutants. aspm-1 loss results in bipolar but abnormal meiotic spindles.\",\n      \"method\": \"Temperature-sensitive allele isolation, live-cell imaging, C. elegans genetics\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with live imaging, multiple alleles, single lab\",\n      \"pmids\": [\"24554763\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ASPM regulates symmetric stem cell division through an interaction with the Cdk2/Cyclin E complex. ASPM modulates Cyclin E ubiquitination, phosphorylation, and nuclear localization, thereby controlling the length of time neural progenitors spend in early G1 before traversing the restriction point, independently of mitotic spindle orientation effects.\",\n      \"method\": \"Mouse Aspm mutant model, co-immunoprecipitation, cell cycle analysis, Cyclin E ubiquitination/phosphorylation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction demonstrated with co-IP and functional ubiquitination assay, single lab\",\n      \"pmids\": [\"26581405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Aspm regulates mitosis and mitigates DNA damage during cerebellar granule neuron progenitor (CGNP) cell division. Genetic deletion of Aspm reduces cerebellar growth, increases mitotic rate, causes impaired mitotic progression, altered division orientation/differentiation, and increased DNA damage leading to progenitor apoptosis. Deletion of Aspm in Smo-induced medulloblastoma reduces tumor growth and increases DNA damage; co-deletion with Bax or Trp53 rescues neural progenitor survival.\",\n      \"method\": \"Conditional Aspm knockout mice, medulloblastoma mouse model, γ-H2AX staining, genetic epistasis with Bax/p53\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO with multiple phenotypic readouts and genetic epistasis, in vivo\",\n      \"pmids\": [\"26450969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Aspm and Wdr62 physically interact and both localize to the proximal end of the mother centriole. Wdr62 is required for Aspm localization. Both proteins, along with Cep63, are required to localize CENPJ/CPAP/Sas-4 at centrioles. Loss of either protein causes centriole duplication defects. Aspm and Wdr62 are also required for normal apical complex localization and apical epithelial structure, promoting premature delamination and precocious differentiation of neural progenitors.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, mouse single and double knockouts, mass spectrometry interactome\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, genetic epistasis, multiple KO models, multiple orthogonal methods\",\n      \"pmids\": [\"27974163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ASPM controls spindle orientation by interacting with citron kinase (CITK). ASPM recruits CITK to the spindle, and CITK overexpression rescues the spindle orientation defect caused by ASPM loss. Both ASPM and CITK affect astral microtubule organization; low doses of a microtubule-stabilizing drug revert the spindle orientation phenotype caused by their knockdown. CITK regulates both astral MT nucleation and stability.\",\n      \"method\": \"siRNA knockdown in mouse cortex and Drosophila, immunofluorescence, astral MT analysis, CITK overexpression rescue, MT-stabilizing drug treatment\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods across two species, rescue experiment, functional pathway placement\",\n      \"pmids\": [\"27562601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ASPM forms a complex with katanin (the microcephaly-associated microtubule-severing ATPase) through conserved motifs: X-ray crystallography revealed the heterodimer of katanin p60 N-terminal and p80 C-terminal domains binds conserved motifs in ASPM. ASPM autonomously tracks growing microtubule minus ends and inhibits their growth. Katanin decorates and bends microtubule ends and potentiates ASPM minus-end blocking activity. ASPM recruits katanin along microtubules and promotes katanin-mediated microtubule severing. ASPM and katanin localize to spindle poles in a mutually dependent manner and regulate spindle flux.\",\n      \"method\": \"X-ray crystallography, reconstitution experiments, in vitro microtubule dynamics assays, immunofluorescence, mass spectrometry\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure, in vitro reconstitution, multiple orthogonal functional assays, replicated across species (fly ASPM/Asp, worm ASPM-1, human ASPM)\",\n      \"pmids\": [\"28436967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human ASPM functions in spindle pole organization during mitotic metaphase redundantly with CDK5RAP2. Deletion of ASPM alone does not affect spindle morphology, but when CDK5RAP2 is depleted in ASPM KO cells, spindle poles are unfocused during prometaphase and anaphase onset is significantly delayed. A hypomorphic patient mutation in ASPM similarly caused spindle pole unfocusing in the absence of CDK5RAP2.\",\n      \"method\": \"CRISPR-based gene knockout, auxin-inducible degron for CDK5RAP2 depletion, live-cell imaging, patient mutation analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — CRISPR KO, conditional depletion system, patient mutation validation, multiple methods in one study\",\n      \"pmids\": [\"28883092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Aspm knockout in ferrets causes severe microcephaly (25-40% reduction in brain weight) reflecting reduced cortical surface area without significant change in cortical thickness, mirroring human patients. Fetal Aspm KO ferret cortex displays large premature displacement of ventricular radial glial cells (vRGCs) to the outer subventricular zone where they resemble outer radial glia. This suggests ASPM regulates cortical expansion by controlling the affinity of vRGCs for the ventricular surface, modulating the ratio of vRGCs to outer radial glia.\",\n      \"method\": \"Genome editing (germline Aspm KO in ferret), histology, immunofluorescence, cortical cell type analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — germline KO in gyrencephalic species with quantitative cellular phenotype, mechanistic interpretation supported by cell-type tracing\",\n      \"pmids\": [\"29643508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ASPM interacts with disheveled-3 (Dvl-3), a canonical upstream regulator of Wnt signaling, and inhibits its proteasome-dependent degradation, thereby increasing Dvl-3 protein stability and enabling Wnt-induced β-catenin transcriptional activity in prostate cancer cells. This mechanism maintains a cancer stem cell (ALDH+) subpopulation.\",\n      \"method\": \"Co-immunoprecipitation, proteasome inhibitor experiments, β-catenin reporter assay, siRNA knockdown, ALDH+ CSC quantification\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus proteasomal degradation assay, single lab, multiple functional readouts\",\n      \"pmids\": [\"30266990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Hepatitis C virus NS5A protein down-regulates ASPM mRNA and protein expression via the PKR-p38 signaling pathway. NS5A represses the ASPM promoter in a dose-dependent manner; amino acid substitutions in NS5A that disrupt NS5A-PKR interaction abolish this effect. Overexpression of ASPM relieves the G2/M cell cycle block induced by NS5A, and NS5A expression causes chromosome aneuploidy.\",\n      \"method\": \"In vivo hydrodynamics-based transfection, laser capture microdissection, microarray, qPCR, Western blot, promoter reporter assay, NS5A mutants, ASPM overexpression rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter with site-directed mutants, multiple assay types, single lab\",\n      \"pmids\": [\"18728014\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ASPM knockdown by siRNA impairs DNA double-strand break (DSB) repair in irradiated human cells, as shown by constant-field gel electrophoresis and γ-H2AX foci analysis, and elevates abnormal chromosomes. IR-sensitization by ASPM knockdown was not enhanced in DNA-PK-deficient glioblastoma cells, indicating ASPM impacts the DNA-PK-dependent (NHEJ) pathway.\",\n      \"method\": \"siRNA knockdown, constant-field gel electrophoresis, γ-H2AX foci analysis, clonogenic survival assay, DNA-PK-deficient cell line\",\n      \"journal\": \"International journal of radiation biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple DSB readouts plus epistasis with DNA-PK-deficient cells, single lab\",\n      \"pmids\": [\"21923303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ASPM is recruited to DNA damage sites in a PARP2-dependent manner and interacts with BRCA1 and its E3 ligase HERC2. ASPM prevents HERC2 from accessing BRCA1, thereby protecting BRCA1 from degradation and ensuring efficient homologous recombination (HR) repair. ASPM inhibition promotes HERC2-mediated BRCA1 degradation, compromises HR efficiency and chromosome stability, and sensitizes cancer cells to ionizing radiation. Synergy between ASPM inhibition and PARP inhibition was observed.\",\n      \"method\": \"Co-immunoprecipitation, HR efficiency assay (DR-GFP reporter), γ-H2AX/RAD51 foci, ASPM siRNA, PARP inhibitor combination assay\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with BRCA1/HERC2, functional HR assay, single lab\",\n      \"pmids\": [\"34142045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ASPM interacts with disheveled-2 (Dvl2) and antagonizes autophagy-mediated Dvl2 degradation by weakening the interaction between Dvl2 and LC3II, thereby increasing Dvl2 protein abundance and activating Wnt/β-catenin signaling in hepatocellular carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, autophagy inhibition, LC3II interaction assay, Wnt reporter assay, siRNA knockdown, xenograft model\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with Dvl2 and LC3II, functional autophagy/degradation readout, single lab\",\n      \"pmids\": [\"34428354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ASPM is enriched at stalled replication forks in a RAD17-dependent manner in response to replication stress. ASPM promotes RAD9 and TopBP1 loading onto chromatin, facilitating ATR-CHK1 checkpoint activation. ASPM depletion results in failed fork restart and MRE11-mediated nascent DNA degradation at stalled forks, causing chromosome instability.\",\n      \"method\": \"DNA fiber assay, iPOND (replication fork isolation), chromatin fractionation, siRNA knockdown, RAD17-dependent localization, CHK1 phosphorylation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mechanistic assays including fork isolation, chromatin loading, checkpoint activation, MRE11 epistasis, single lab but highly rigorous\",\n      \"pmids\": [\"36161901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASPM isoform 1 (ASPM-I1, containing exon 18) stabilizes the Hedgehog transcriptional factor GLI1 at the protein level through a unique exon-18-encoded region by competing with E3 ligases β-TrCP and CUL3, preventing GLI1 proteasomal degradation. In parallel, ASPM-I1 sustains SMO transcription through the Wnt-DVL3-β-catenin signaling axis in small cell lung cancer cells.\",\n      \"method\": \"Reporter array screening, co-immunoprecipitation, ubiquitination assay, GLI1 proteasomal degradation assay, SMO transcription analysis, in vivo xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and proteasomal competition assay for GLI1, Wnt pathway assay for SMO, single lab, isoform-specific mechanism\",\n      \"pmids\": [\"36638332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ASPM isoform 1 (ASPM-i1) interacts with NOTCH1 intracellular domain (NICD1) and competes with FBXW7 (E3 ubiquitin ligase) binding to NICD1, blocking FBXW7-mediated polyubiquitination and proteasomal degradation of NICD1, thereby stabilizing NICD1 and activating Notch signaling in hepatocellular carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, FBXW7-binding-deficient NICD1 mutant, siRNA knockdown rescue, tissue co-expression analysis\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, ubiquitination assay, mutant NICD1 validation, single lab\",\n      \"pmids\": [\"38279565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ASPM interacts with FOXM1 protein via liquid-liquid phase separation (LLPS), enhancing FOXM1 stability by preventing proteasome-mediated degradation. ASPM and FOXM1 co-occupy promoters of multiple genes (ChIP-seq). FOXM1 also transcriptionally activates ASPM expression, forming a positive feedback loop in hepatocellular carcinoma cells.\",\n      \"method\": \"LLPS assay, co-immunoprecipitation, ChIP-sequencing, proteasomal degradation assay, luciferase reporter, xenograft model\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — LLPS plus co-IP plus ChIP-seq, multiple methods, single lab\",\n      \"pmids\": [\"40122889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ASPM interacts with KIF11 (Eg5 kinesin) in HCC cells as demonstrated by co-immunoprecipitation. ASPM in combination with KIF11 promotes HCC malignant progression via the Wnt/β-catenin signaling pathway; ASPM knockdown effects on proliferation, invasion, and migration are rescued by KIF11 overexpression.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, KIF11 overexpression rescue, Western blot for Wnt pathway components\",\n      \"journal\": \"Experimental and therapeutic medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP, single lab, rescue experiment but limited mechanistic depth\",\n      \"pmids\": [\"34504599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ASPM inhibits ubiquitin-mediated degradation of KIF11 through direct binding, stabilizing KIF11 protein in anaplastic thyroid carcinoma cells. KO of ASPM reduces KIF11 protein levels and inhibits EMT and tumor migration/invasion.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, ASPM knockout (CRISPR), Western blot, xenograft model\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — co-IP and ubiquitination assay shown, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"36883909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"METTL3-mediated N6-methyladenosine (m6A) modification of ASPM mRNA promotes ASPM expression in liver hepatocellular carcinoma. Silencing METTL3 suppresses HCC cell proliferation, migration, and invasion, and this is rescued by ASPM overexpression.\",\n      \"method\": \"MeRIP (m6A immunoprecipitation), METTL3 knockdown, ASPM rescue overexpression, Western blot, cell functional assays\",\n      \"journal\": \"Journal of clinical laboratory analysis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — MeRIP for m6A validation, single lab, functional rescue is indirect\",\n      \"pmids\": [\"34398984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FoxM1 transcription factor directly binds the ASPM promoter at specific sites (-236 to -230 bp and -1354 to -1348 bp) and activates ASPM transcription, as confirmed by ChIP and dual-luciferase reporter assay. ASPM mediates FoxM1-driven proliferation and migration in glioma cells.\",\n      \"method\": \"ChIP, dual-luciferase reporter assay, siRNA knockdown, FoxM1 overexpression\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter assay confirm direct promoter binding, single lab\",\n      \"pmids\": [\"32667745\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASPM is a large scaffold protein that concentrates at mitotic spindle poles and the midbody/midbody ring, where it tracks growing microtubule minus ends, inhibits their growth, recruits and is co-regulated by the microtubule-severing ATPase katanin, and works redundantly with CDK5RAP2 to focus spindle poles; it also interacts with citron kinase (CITK) to control astral microtubule organization and spindle orientation, maintains the symmetric proliferative divisions of neural progenitor cells (thereby controlling brain size), localizes to the mother centriole with WDR62 to support centriole biogenesis and apical complex integrity, modulates Wnt/β-catenin signaling by protecting Dvl proteins from degradation, regulates G1 restriction point progression through interaction with the Cdk2/Cyclin E complex, and participates in DNA double-strand break repair (NHEJ and HR via BRCA1 stabilization) and replication stress response (ATR-CHK1 activation at stalled forks via RAD17-RAD9/TopBP1 loading), while in cancer contexts its isoform 1 additionally stabilizes GLI1 (Hedgehog), NICD1 (Notch), and FOXM1 by competing with their E3 ubiquitin ligases.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ASPM is a large IQ-domain scaffold protein that controls mitotic spindle organization in neural progenitors and thereby sets cerebral cortical size, originally identified as the human ortholog of Drosophila abnormal spindle and as a recurrent cause of autosomal recessive primary microcephaly (MCPH) [#0, #6]. It concentrates at centrosomes/spindle poles in interphase and mitosis and at the midbody during cytokinesis, with its N-terminus directing centrosomal/spindle-pole localization and its disease-critical C-terminus directing midbody localization [#1, #4]. Mechanistically, ASPM autonomously tracks growing microtubule minus ends and inhibits their growth; it forms a structurally defined complex with the severing ATPase katanin (p60/p80), mutually depends on katanin for spindle-pole accumulation, and recruits katanin to promote microtubule severing and spindle flux [#16]. It focuses spindle poles redundantly with CDK5RAP2 [#17] and organizes astral microtubules and spindle orientation through citron kinase, which it recruits to the spindle [#15]. ASPM maintains the symmetric proliferative divisions and ventricular-surface affinity of radial glia, so its loss shifts progenitors toward premature neurogenic/asymmetric divisions and reduces cortical surface area in mouse and ferret models [#3, #18]. Beyond spindle architecture, ASPM associates with WDR62 at the mother centriole to support centriole biogenesis and apical complex integrity [#14], gates G1/S progression via the Cdk2/Cyclin E complex [#12], and is essential for germline development, with a human ASPM transgene rescuing mouse microcephaly and germ-cell loss [#7]. ASPM additionally functions in genome maintenance: it acts in DNA-PK-dependent double-strand-break repair, protects BRCA1 from HERC2-mediated degradation to sustain homologous recombination, and is loaded at stalled replication forks in a RAD17-dependent manner to promote RAD9/TopBP1 chromatin loading and ATR-CHK1 checkpoint activation [#21, #22, #24]. In cancer, ASPM (notably exon-18-containing isoform 1) stabilizes oncogenic effectors by competing with their E3 ligases or autophagic turnover, including Dishevelled proteins to potentiate Wnt/\\u03b2-catenin signaling, GLI1, NICD1, and FOXM1 [#19, #23, #25, #26, #27].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established ASPM's identity and the founding hypothesis that brain size is governed by spindle activity in neuronal progenitors, by linking it to MCPH and to the Drosophila spindle gene asp.\",\n      \"evidence\": \"Genetic mapping and mutation analysis in microcephaly patients with comparative protein-domain and mouse expression analysis\",\n      \"pmids\": [\"12355089\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No biochemical activity or direct partner defined\", \"Mechanism connecting spindle function to progenitor fate not yet shown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Localized ASPM to centrosomes and spindle poles and mapped its domain architecture (CH domains plus ~81 IQ repeats), placing it physically at the mitotic apparatus.\",\n      \"evidence\": \"Immunostaining of cultured human cells with N- and C-terminal antibodies plus isoform RT-PCR\",\n      \"pmids\": [\"15972725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of IQ repeats and CH domains untested\", \"No interacting partner identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected ASPM spindle-pole localization to cell-fate by showing its loss reorients the cleavage plane and depletes the progenitor pool, linking spindle orientation to neurogenesis.\",\n      \"evidence\": \"RNAi in mouse embryonic neuroepithelium with cleavage-plane and cell-fate tracking\",\n      \"pmids\": [\"16798874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of spindle-pole anchoring unknown\", \"Direct microtubule activity not demonstrated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved a functional division of labor within ASPM and added citron kinase as a midbody partner, explaining why C-terminal truncations are pathogenic.\",\n      \"evidence\": \"Reciprocal co-IP with CITK and GFP-fragment localization in HeLa and neuroepithelium\",\n      \"pmids\": [\"17534152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the CITK interaction not yet tested\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined a conserved spindle-pole module (LIN-5/ASPM-1/calmodulin) acting through dynein independently of cortical Gα signaling, generalizing ASPM's spindle-pole role to meiosis.\",\n      \"evidence\": \"C. elegans genetic epistasis, co-IP, and live imaging\",\n      \"pmids\": [\"19219036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct human orthology of the LIN-5 partnership not shown\", \"Biochemical mechanism of pole accumulation unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed ASPM is a microtubule-dependent minus-end-associated pericentriolar protein required for spindle orientation and cytokinesis, and that its extreme C-terminus is essential, providing mechanistic basis for MCPH mutations.\",\n      \"evidence\": \"siRNA, live imaging, patient-fibroblast and dominant-negative fragment analysis in U2OS; transgenic mouse rescue with human ASPM\",\n      \"pmids\": [\"21044324\", \"20823249\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct microtubule-binding biochemistry not yet reconstituted\", \"Mechanism of minus-end recognition unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Extended ASPM beyond the spindle by linking it to Wnt signaling, BRCA1 stability, DSB repair, and a UBE3A interaction, suggesting multifunctional roles.\",\n      \"evidence\": \"In utero electroporation with Wnt reporter/β-catenin rescue; siRNA with γ-H2AX and DNA-PK-deficient cells; yeast two-hybrid for UBE3A\",\n      \"pmids\": [\"21937711\", \"21923303\", \"21633703\", \"16123590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"UBE3A interaction lacks reciprocal co-IP (Low confidence)\", \"Direct molecular link between ASPM and Wnt machinery not yet defined\", \"BRCA1 reduction was single-method observation\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Separated ASPM's spindle-orientation function from a distinct cell-cycle role, showing it gates G1 restriction-point timing via Cyclin E and mitigates DNA damage in dividing progenitors.\",\n      \"evidence\": \"Mouse Aspm mutants, co-IP, Cyclin E ubiquitination/phosphorylation assays; conditional KO with γ-H2AX and Bax/p53 epistasis in cerebellar progenitors and medulloblastoma\",\n      \"pmids\": [\"26581405\", \"26450969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ASPM modulates Cyclin E ubiquitination biochemically unresolved\", \"Link between mitotic and DNA-damage functions unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed ASPM into two cortical-development modules: a centriolar WDR62 complex for centriole biogenesis and apical integrity, and a CITK-dependent astral-microtubule pathway controlling spindle orientation.\",\n      \"evidence\": \"Reciprocal co-IP, mass spectrometry, single/double KO mice for WDR62; cross-species siRNA, rescue, and MT-drug treatment for CITK\",\n      \"pmids\": [\"27974163\", \"27562601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy among centriolar partners only partly resolved\", \"Direct astral MT-regulating activity of ASPM not biochemically isolated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the definitive biochemical mechanism: ASPM tracks and blocks microtubule minus-end growth and forms a structurally defined complex with katanin to control severing and spindle flux, and focuses poles redundantly with CDK5RAP2.\",\n      \"evidence\": \"X-ray crystallography, in vitro reconstitution and MT-dynamics assays; CRISPR KO with auxin-degron CDK5RAP2 depletion and patient-mutation validation\",\n      \"pmids\": [\"28436967\", \"28883092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How minus-end tracking integrates with pole focusing in vivo not fully mapped\", \"Redundancy partners beyond CDK5RAP2 unexplored\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated in a gyrencephalic species that ASPM expands cortex by controlling radial-glia attachment to the ventricular surface, and refined its prostate-cancer Wnt role to Dishevelled stabilization.\",\n      \"evidence\": \"Germline Aspm KO ferret with cortical cell-type tracing; co-IP, proteasome inhibition and β-catenin reporter for Dvl-3\",\n      \"pmids\": [\"29643508\", \"30266990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular signal linking spindle/centriole function to surface affinity unknown\", \"How ASPM shields Dvl-3 from the proteasome not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined ASPM's genome-maintenance mechanism at forks and breaks, showing RAD17-dependent fork loading driving ATR-CHK1 activation and BRCA1 protection from HERC2 to sustain homologous recombination.\",\n      \"evidence\": \"iPOND, DNA fiber, chromatin fractionation and CHK1 assays; co-IP with BRCA1/HERC2 and DR-GFP HR reporter with PARPi synergy\",\n      \"pmids\": [\"36161901\", \"34142045\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a spindle-pole protein is recruited to chromatin/forks structurally unclear\", \"Relationship between mitotic and DNA-repair pools of ASPM unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Elaborated a recurring oncogenic theme in which ASPM (often exon-18 isoform 1) stabilizes oncoproteins by competing with their degradation machinery, spanning GLI1, NICD1, FOXM1, and Dvl2.\",\n      \"evidence\": \"Co-IP, ubiquitination and proteasomal/autophagic degradation assays, LLPS, ChIP-seq, and xenografts across SCLC, HCC, and glioma\",\n      \"pmids\": [\"36638332\", \"38279565\", \"40122889\", \"34428354\", \"32667745\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether E3-ligase competition reflects a single shared biochemical mechanism unknown\", \"Several interactions are single-lab co-IP based\", \"Isoform-specificity not validated across all targets\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ASPM's defined microtubule minus-end/katanin activity mechanistically connects to its diverse non-spindle functions (Cyclin E gating, fork/break repair, Wnt and oncoprotein stabilization), and whether these reflect distinct protein pools or a unifying scaffolding principle.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model linking the IQ-repeat scaffold to its many partners\", \"Isoform-specific functional partitioning incompletely mapped\", \"Mechanism of chromatin/fork recruitment of a centrosomal protein undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [6, 16]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 15, 16, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 22, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1, 2, 6, 14]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [6, 10, 16]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [22, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 6, 12, 17]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [21, 22, 24]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 19, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 18]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"complexes\": [\n      \"ASPM-katanin (p60/p80) complex\",\n      \"ASPM-WDR62 centriolar complex\",\n      \"LIN-5/ASPM-1/calmodulin spindle-pole complex\"\n    ],\n    \"partners\": [\n      \"KATNA1\",\n      \"CDK5RAP2\",\n      \"WDR62\",\n      \"CIT\",\n      \"BRCA1\",\n      \"HERC2\",\n      \"CCNE1\",\n      \"DVL3\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}