{"gene":"EFHC1","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2004,"finding":"EFHC1 coimmunoprecipitates with the C terminus of the R-type voltage-dependent Ca2+ channel (Cav2.3), and overexpression of EFHC1 specifically increases R-type Ca2+ currents in patch-clamp analysis; JME-associated mutations reverse this current increase and suppress EFHC1-induced apoptosis in hippocampal neurons","method":"Co-immunoprecipitation, patch-clamp electrophysiology, neuronal apoptosis assay with pharmacological rescue (SNX-482)","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal Co-IP plus functional electrophysiology with disease-mutant controls, foundational paper with 239 citations","pmids":["15258581"],"is_preprint":false},{"year":2006,"finding":"EFHC1 localizes to the centrosome during interphase and co-localizes with the mitotic spindle (especially spindle poles) and midbody during mitosis/cytokinesis; deletion analysis shows the N-terminal region is required for spindle and midbody association","method":"EGFP-fusion live imaging, immunofluorescence with endogenous antibody, deletion constructs in multiple cell lines","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment with functional domain mapping, orthogonal antibody confirmation","pmids":["16824517"],"is_preprint":false},{"year":2009,"finding":"EFHC1 is a microtubule-associated protein (MAP); loss of function disrupts mitotic spindle organization, impairs M-phase progression, induces microtubule bundling, increases apoptosis, and causes radial migration defects in the developing neocortex by impairing cell-cycle exit of cortical progenitors and radial glia scaffold organization","method":"In vitro EFHC1 loss-of-function, ex vivo and in utero electroporation in rat neocortex, mitotic spindle imaging","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vitro and in vivo methods in a high-impact paper with 57 citations","pmids":["19734894"],"is_preprint":false},{"year":2009,"finding":"Efhc1-deficient mice show reduced ciliary beating frequency in ependymal cilia (despite intact ciliary structure), enlarged brain ventricles, spontaneous myoclonus, and reduced pentylenetetrazol seizure threshold, establishing a loss-of-function epileptic phenotype","method":"Knockout mouse generation, ciliary beat frequency measurement, behavioral seizure monitoring, PTZ threshold testing","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple defined phenotypic readouts, 56 citations","pmids":["19147686"],"is_preprint":false},{"year":2005,"finding":"The mouse ortholog mRib72-1/Efhc1 is a homolog of the Chlamydomonas axonemal protein Rib72 and is abundantly present in sperm flagella and tracheal cilia (motile cilia) but only in small amounts in the brain; it is absent from immotile primary cilia","method":"Western blot analysis and immunofluorescence localization in mouse tissues","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization by immunofluorescence and western blot, replicated in subsequent studies","pmids":["15670853"],"is_preprint":false},{"year":2012,"finding":"EFHC1 physically interacts with both the N- and C-terminal cytoplasmic regions of the TRPM2 channel (demonstrated by immunoprecipitation); co-expression of EFHC1 potentiates H2O2- and ADPR-induced Ca2+ responses and cationic currents via TRPM2, and enhances TRPM2-mediated cell death susceptibility; JME mutations reverse these effects","method":"Co-immunoprecipitation, Ca2+ imaging, whole-cell patch-clamp in HEK293 cells, cell death assay with JME mutants","journal":"Cell calcium","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal Co-IP plus functional electrophysiology and cell death assays with disease-mutant validation","pmids":["22226147"],"is_preprint":false},{"year":2012,"finding":"JME mutations in EFHC1 (including F229L) act in a dominant-negative manner to impair mitotic spindle organization; mutant EFHC1 expression disrupts radial and tangential neuronal migration by affecting radial glia morphology and migrating neuron morphology, while not altering centrosome/spindle colocalization","method":"Ex vivo electroporation with mutant constructs, immunofluorescence of mitotic spindles and radial glia, neuronal migration assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple mutant constructs tested with orthogonal migration and spindle assays, extends prior findings","pmids":["22926142"],"is_preprint":false},{"year":2008,"finding":"The C-terminal half of EFHC1 (residues 403–640), which contains the EF-hand motif, can dimerize via disulfide bond through Cys575; dimerization under oxidizing conditions blocks Ca2+ and Mg2+ binding to the EF-hand (1:1 binding stoichiometry under reducing but not oxidizing conditions)","method":"Size exclusion chromatography, mass spectrometry, tandem MS/MS, DTNB thiol assay, isothermal titration calorimetry","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal biochemical/biophysical methods establishing Ca2+/Mg2+ binding and dimer mechanism","pmids":["18593566"],"is_preprint":false},{"year":2011,"finding":"Drosophila Defhc1.1 (EFHC1 ortholog) binds to microtubules in vitro and co-localizes with axonal and synaptic microtubules in vivo; its loss reduces microtubule loops at synaptic terminals, increases satellite boutons and spontaneous neurotransmitter release, and expands the dendritic arbor; pharmacological inhibition of microtubule dynamics (vinblastine) suppresses the satellite bouton phenotype, establishing EFHC1 as a negative regulator of microtubule dynamics at synapses","method":"Drosophila KO, in vitro microtubule binding, immunofluorescence, electrophysiology (mEPSPs), vinblastine pharmacological rescue, dendritic morphometry","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro binding assay plus in vivo KO with pharmacological rescue and multiple orthogonal readouts","pmids":["21835885"],"is_preprint":false},{"year":2016,"finding":"In Xenopus laevis, EFHC1b morpholino knockdown inhibits multiciliated cell formation and specifically blocks axoneme (but not basal body) formation; EFHC1b-GFP localizes to ciliary axonemes; knockdown increases Wnt8a RNA levels and activates β-catenin/TOPFLASH reporter; the Wnt-related phenotypes are rescued by a truncated EFHC1b lacking full ciliary-localization sequences, while axonemal phenotypes require the full-length protein","method":"Xenopus morpholino knockdown, GFP-fusion localization, TOPFLASH reporter assay, domain-deletion rescue experiments, in situ hybridization","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — morpholino KD with domain-specific rescue experiments and multiple orthogonal readouts in Xenopus","pmids":["26783883"],"is_preprint":false},{"year":2019,"finding":"C. elegans EFHC-1 functions within non-motile mechanosensory cilia to regulate neuronal activation; it also localizes at the synapse where it modulates dopamine signaling in cooperation with the R-type voltage-gated calcium channel ortholog, revealing a dual regulation of neuronal excitability at cilium and synapse","method":"C. elegans genetics, live imaging, behavioral assays, dopamine signaling readouts, epistasis with R-type VGCC ortholog","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — epistasis combined with localization and multiple behavioral/signaling readouts in an ortholog model","pmids":["30810526"],"is_preprint":false},{"year":2020,"finding":"Using a validated monoclonal antibody (6A3-mAb) and Efhc1-/- mice as negative controls, myoclonin1 is detected only in cells with motile cilia (ependymal cells, choroid plexus, trachea, sperm) but not in neurons or at the mitotic spindle/midbody; complete elimination of myoclonin1 does not affect cell division or neuronal migration in the cerebral cortex","method":"Immunohistochemistry and western blot with monoclonal antibody validated in Efhc1-/- mice, immunocytochemistry in dividing cells","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — rigorous antibody validation with KO negative controls and multiple imaging modalities","pmids":["33328576"],"is_preprint":false},{"year":2007,"finding":"Myoclonin1/EFHC1 is sequentially expressed in choroid plexus epithelial cells (embryonic), then ependymal cell cilia lining ventricle walls (postnatal to adult), as well as tracheal cilia and sperm flagella; it is absent from choroid plexus in adults; localization verified using Efhc1-deficient mice as negative controls","method":"Immunohistochemistry and in situ hybridization in mouse across developmental stages, validated in Efhc1-KO","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — localization with KO negative controls, but functional consequence not directly established in this study","pmids":["18164683"],"is_preprint":false},{"year":2026,"finding":"Selective deletion of myoclonin1 in choroid plexus and ependymal cells (FoxJ1-Cre × floxed-Efhc1) produces increased PTZ seizure susceptibility in adult heterozygotes and enlarged brain ventricles in homozygotes, partially recapitulating the systemic Efhc1-KO phenotype and establishing that loss of myoclonin1 specifically in motile-ciliated cells contributes to epileptic pathophysiology","method":"Conditional KO mouse (FoxJ1-Cre driver), PTZ seizure threshold testing, brain ventricle morphometry","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KO with defined phenotypic readouts linking motile-ciliated cell function to epilepsy","pmids":["42000019"],"is_preprint":false},{"year":2024,"finding":"Myoclonin1 co-localizes with and physically binds to IP3 receptor type 1 (IP3R1) in choroid plexus and ependymal cells; Efhc1-/- cells show elevated ER Ca2+ stores and enhanced IP3-induced Ca2+ release; myoclonin1 also interacts with PRKCSH (80K-H), a known IP3R1-interacting protein, and binds IP3R2 and IP3R3, indicating that myoclonin1 modulates ER-Ca2+ homeostasis through IP3R interactions","method":"Co-immunoprecipitation, Ca2+ imaging in Efhc1-/- vs WT cells, co-localization imaging","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional Ca2+ measurements in KO cells; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2024.07.01.601633"],"is_preprint":true}],"current_model":"EFHC1 (myoclonin1) is primarily expressed in motile-cilia-bearing cells (choroid plexus, ependymal cells, trachea, sperm flagella) where it functions as a microtubule-associated axonemal protein that regulates ciliary beat frequency, ER-Ca2+ homeostasis via IP3R interactions, and modulates Ca2+ signaling through physical interactions with Cav2.3 (R-type VDCC) and TRPM2 channels; in developing brain it also acts as a negative regulator of microtubule dynamics necessary for mitotic spindle organization and neuronal migration, while at the synapse (established in C. elegans and Drosophila orthologs) it restrains neurite/dendritic overgrowth and spontaneous neurotransmitter release, with JME-causing mutations acting dominantly to impair these functions and thereby disrupt neuronal circuit development and excitability thresholds."},"narrative":{"teleology":[{"year":2004,"claim":"Establishing that EFHC1 is a functional modulator of a specific ion channel answered how a newly identified epilepsy gene could alter neuronal excitability: EFHC1 physically interacts with Cav2.3 and increases R-type Ca²⁺ currents, with JME mutations abolishing this effect and suppressing pro-apoptotic activity.","evidence":"Co-immunoprecipitation, patch-clamp electrophysiology, and apoptosis assays with pharmacological validation in hippocampal neurons","pmids":["15258581"],"confidence":"High","gaps":["Mechanism by which EFHC1 potentiates Cav2.3 currents not resolved","In vivo relevance of EFHC1-induced apoptosis unclear","Whether the interaction is direct or mediated by a complex not determined"]},{"year":2005,"claim":"Resolving where endogenous EFHC1 protein resides answered a critical cell-biological question: EFHC1 is a motile-cilia/flagella protein homologous to Chlamydomonas axonemal Rib72, abundantly present in sperm and trachea but scarce in brain and absent from primary cilia.","evidence":"Western blot and immunofluorescence in mouse tissues","pmids":["15670853"],"confidence":"Medium","gaps":["Functional role in motile cilia not yet tested","Brain expression level low—functional significance in neurons ambiguous","Antibody specificity not validated against KO at this time"]},{"year":2006,"claim":"Demonstrating centrosome and mitotic spindle localization raised the possibility that EFHC1 has a cell-division role beyond cilia, with N-terminal domain mapping showing requirements for spindle and midbody association.","evidence":"EGFP-fusion live imaging and immunofluorescence with deletion constructs in mammalian cell lines","pmids":["16824517"],"confidence":"High","gaps":["Whether endogenous EFHC1 at spindle is functionally required not tested","Spindle localization later contested by KO-validated antibody study (PMID:33328576)","Relevance to in vivo cell division unknown"]},{"year":2007,"claim":"Mapping developmental expression dynamics in choroid plexus and ependyma clarified that EFHC1 is sequentially deployed in specific motile-ciliated cell populations across brain development.","evidence":"Immunohistochemistry and in situ hybridization across mouse developmental stages, validated in Efhc1-KO tissue","pmids":["18164683"],"confidence":"Medium","gaps":["Functional consequence of developmental switch in expression not tested","Whether brain expression extends to neurons still debated"]},{"year":2008,"claim":"Biochemical characterization of the C-terminal EF-hand domain established that EFHC1 is a redox-sensitive calcium sensor: it binds Ca²⁺/Mg²⁺ at 1:1 stoichiometry under reducing conditions but dimerizes via Cys575 disulfide under oxidizing conditions, which blocks divalent cation binding.","evidence":"Size exclusion chromatography, mass spectrometry, thiol assay, and isothermal titration calorimetry on purified C-terminal fragment","pmids":["18593566"],"confidence":"High","gaps":["Physiological relevance of redox-regulated dimerization untested in cells","Whether full-length protein behaves similarly unknown","No structural model available"]},{"year":2009,"claim":"Two landmark studies established that EFHC1 loss of function has both ciliary and neurodevelopmental consequences: knockout mice show reduced ependymal ciliary beat frequency, ventriculomegaly, myoclonus, and lowered seizure threshold, while in developing rat cortex, EFHC1 knockdown disrupts mitotic spindle organization and radial neuronal migration.","evidence":"Efhc1-KO mice with ciliary beat frequency, behavioral and PTZ seizure phenotyping; in utero electroporation and spindle imaging in rat neocortex","pmids":["19147686","19734894"],"confidence":"High","gaps":["Relative contribution of ciliary vs. neuronal migration defects to seizure phenotype unclear","Whether spindle phenotype reflects endogenous neuronal EFHC1 later challenged","Mechanism linking reduced ciliary beat frequency to seizures not established"]},{"year":2011,"claim":"Drosophila ortholog studies answered whether EFHC1 directly binds microtubules and regulates synaptic architecture: Defhc1.1 binds microtubules in vitro, and its loss increases synaptic boutons and spontaneous neurotransmitter release—phenotypes suppressed by the microtubule-stabilizing drug vinblastine—establishing EFHC1 as a negative regulator of microtubule dynamics at synapses.","evidence":"Drosophila KO, in vitro microtubule binding assay, electrophysiology, vinblastine rescue, dendritic morphometry","pmids":["21835885"],"confidence":"High","gaps":["Mammalian synaptic function of EFHC1 not confirmed","Direct microtubule binding not demonstrated for mammalian protein","Whether synaptic phenotype is cell-autonomous not resolved"]},{"year":2012,"claim":"Two studies extended the ion channel and neurodevelopmental story: EFHC1 physically interacts with TRPM2 to potentiate oxidative stress-induced Ca²⁺ entry (reversed by JME mutations), and JME mutations act dominant-negatively to disrupt mitotic spindle organization and both radial and tangential neuronal migration.","evidence":"Co-IP, patch-clamp, and cell death assays in HEK293 for TRPM2; ex vivo electroporation with mutant constructs and migration/spindle assays for neuronal migration","pmids":["22226147","22926142"],"confidence":"High","gaps":["In vivo relevance of TRPM2 interaction to epilepsy not tested","Dominant-negative mechanism at molecular level unresolved","Whether neuronal migration defects are primary or secondary to spindle disruption unclear"]},{"year":2016,"claim":"Xenopus studies revealed EFHC1 is required for axoneme assembly in multiciliated cells and identified a separable role in restraining Wnt/β-catenin signaling, linking EFHC1 to a major developmental signaling pathway.","evidence":"Morpholino knockdown in Xenopus with GFP-fusion localization, TOPFLASH reporter, and domain-deletion rescue","pmids":["26783883"],"confidence":"High","gaps":["Mechanism of Wnt pathway modulation unknown","Whether Wnt regulation occurs in mammalian ciliated cells not tested","Relationship between Wnt modulation and epilepsy unexplored"]},{"year":2019,"claim":"C. elegans studies demonstrated that EFHC-1 functions in both non-motile mechanosensory cilia and at synapses to regulate neuronal excitability, cooperating with the R-type VGCC ortholog—extending the Cav2.3 interaction to an in vivo dual-site regulatory model.","evidence":"C. elegans genetics, live imaging, behavioral assays, epistasis with R-type VGCC ortholog","pmids":["30810526"],"confidence":"High","gaps":["Whether dual ciliary-synaptic regulation applies in mammalian neurons not confirmed","Molecular mechanism of cooperation with R-type VGCC at synapse unresolved"]},{"year":2020,"claim":"A rigorous antibody validation study using Efhc1-KO controls challenged earlier neuronal and spindle localizations: KO-validated monoclonal antibody detected myoclonin1 only in motile-ciliated cells, not in neurons or at the mitotic spindle, and complete Efhc1 elimination did not affect cell division or cortical neuronal migration.","evidence":"Immunohistochemistry and western blot with KO-validated monoclonal antibody (6A3-mAb), immunocytochemistry in dividing cells","pmids":["33328576"],"confidence":"High","gaps":["Discrepancy with earlier spindle/neuron findings not fully reconciled—may reflect overexpression artifacts vs. endogenous protein","Does not rule out low-level neuronal expression below detection","Functional role that produces seizure phenotype if protein is absent from neurons needs alternative explanation"]},{"year":2024,"claim":"Identification of IP3R1 as a physical binding partner in choroid plexus/ependymal cells, with loss of EFHC1 causing elevated ER Ca²⁺ stores and enhanced IP3-induced Ca²⁺ release, provided a molecular mechanism for EFHC1's role in calcium homeostasis within its primary expression domain.","evidence":"(preprint) Co-immunoprecipitation, Ca²⁺ imaging in Efhc1-KO vs. WT choroid plexus/ependymal cells","pmids":["bio_10.1101_2024.07.01.601633"],"confidence":"Medium","gaps":["Preprint awaiting peer review","Whether ER-Ca²⁺ dysregulation is causally linked to seizure susceptibility not tested","Stoichiometry and structural basis of IP3R interaction unknown"]},{"year":2026,"claim":"Cell-type-specific conditional deletion established that loss of myoclonin1 specifically in motile-ciliated (FoxJ1+) cells is sufficient to increase seizure susceptibility, directly linking ciliary dysfunction to the epileptic phenotype and resolving a long-standing question about the relevant cell type.","evidence":"Conditional KO mouse (FoxJ1-Cre × floxed-Efhc1), PTZ seizure threshold testing, ventricle morphometry","pmids":["42000019"],"confidence":"High","gaps":["Heterozygote seizure phenotype suggests haploinsufficiency but mechanism not resolved","How ciliary dysfunction in ependyma/choroid plexus lowers seizure threshold remains unknown","Whether additional non-ciliated cell contributions exist cannot be excluded"]},{"year":null,"claim":"The central unresolved question is the mechanism by which EFHC1 loss in motile-ciliated ependymal/choroid plexus cells leads to altered neuronal excitability and seizure susceptibility—whether through CSF composition changes, Wnt signaling, Ca²⁺ homeostasis perturbation, or another pathway.","evidence":"","pmids":[],"confidence":"Low","gaps":["No direct link established between ciliary beat/ER-Ca²⁺ defect and circuit-level hyperexcitability","Mammalian synaptic function of EFHC1 not demonstrated with endogenous protein","No high-resolution structure of EFHC1 or its complexes available"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,2,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5,10]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[3,4,9,11,12,13]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,2,8]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,10]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3,9,13]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,8,10]}],"complexes":[],"partners":["CACNA1E","TRPM2","ITPR1","PRKCSH"],"other_free_text":[]},"mechanistic_narrative":"EFHC1 (myoclonin1) is a microtubule-associated, EF-hand-containing axonemal protein predominantly expressed in motile-cilia-bearing cells—choroid plexus, ependymal cells, trachea, and sperm flagella—where it regulates ciliary beat frequency, axoneme assembly, and calcium homeostasis [PMID:15670853, PMID:18164683, PMID:33328576, PMID:26783883]. EFHC1 modulates neuronal excitability through physical interactions with the R-type voltage-gated calcium channel Cav2.3 and the TRPM2 channel, enhancing their Ca²⁺ currents, and through regulation of ER-Ca²⁺ release via IP3 receptors; JME-causing mutations reverse these functional effects [PMID:15258581, PMID:22226147]. In invertebrate models, EFHC1 orthologs bind microtubules directly, restrain synaptic overgrowth and spontaneous neurotransmitter release, and regulate mechanosensory cilium and synapse function in cooperation with R-type calcium channels [PMID:21835885, PMID:30810526]. Loss of EFHC1 specifically in motile-ciliated cells produces increased seizure susceptibility and ventriculomegaly, establishing that its ciliary function contributes directly to the epileptic phenotype of juvenile myoclonic epilepsy [PMID:19147686, PMID:42000019]."},"prefetch_data":{"uniprot":{"accession":"Q5JVL4","full_name":"EF-hand domain-containing protein 1","aliases":["Myoclonin-1"],"length_aa":640,"mass_kda":74.0,"function":"Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme, which is required for motile cilia beating (PubMed:36191189). Microtubule-associated protein which regulates cell division and neuronal migration during cortical development (PubMed:19734894, PubMed:28370826). Necessary for radial and tangential cell migration during brain development, possibly acting as a regulator of cell morphology and process formation during migration (PubMed:22926142). May enhance calcium influx through CACNA1E and stimulate programmed cell death (PubMed:15258581, PubMed:19734894, PubMed:22926142, PubMed:28370826)","subcellular_location":"Cytoplasm, cytoskeleton, cilium axoneme; Cytoplasm, cytoskeleton, flagellum axoneme; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, spindle; Cytoplasm, cytoskeleton, spindle pole","url":"https://www.uniprot.org/uniprotkb/Q5JVL4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EFHC1","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/EFHC1","total_profiled":1310},"omim":[{"mim_id":"608816","title":"MYOCLONIC EPILEPSY, JUVENILE, SUSCEPTIBILITY TO, 3; EJM3","url":"https://www.omim.org/entry/608816"},{"mim_id":"608815","title":"EF-HAND DOMAIN (C-TERMINAL)-CONTAINING PROTEIN 1; EFHC1","url":"https://www.omim.org/entry/608815"},{"mim_id":"607631","title":"EPILEPSY, JUVENILE ABSENCE, SUSCEPTIBILITY TO, 1; EJA1","url":"https://www.omim.org/entry/607631"},{"mim_id":"300817","title":"EF-HAND DOMAIN (C-TERMINAL)-CONTAINING PROTEIN 2; EFHC2","url":"https://www.omim.org/entry/300817"},{"mim_id":"254770","title":"EPILEPSY, MYOCLONIC JUVENILE; EJM","url":"https://www.omim.org/entry/254770"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Plasma membrane","reliability":"Uncertain"},{"location":"Mid piece","reliability":"Uncertain"},{"location":"Principal piece","reliability":"Uncertain"},{"location":"End piece","reliability":"Uncertain"},{"location":"Cytosol","reliability":"Additional"},{"location":"Equatorial segment","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"fallopian tube","ntpm":32.5}],"url":"https://www.proteinatlas.org/search/EFHC1"},"hgnc":{"alias_symbol":["FLJ10466","RIB72","POC9"],"prev_symbol":["EJM1","EJM"]},"alphafold":{"accession":"Q5JVL4","domains":[{"cath_id":"-","chopping":"24-80","consensus_level":"medium","plddt":69.9293,"start":24,"end":80},{"cath_id":"2.30.29.170","chopping":"87-215","consensus_level":"high","plddt":91.8362,"start":87,"end":215},{"cath_id":"2.30.29.170","chopping":"230-358","consensus_level":"high","plddt":88.5593,"start":230,"end":358},{"cath_id":"-","chopping":"380-405","consensus_level":"medium","plddt":89.0673,"start":380,"end":405},{"cath_id":"2.30.29.170","chopping":"417-538","consensus_level":"high","plddt":90.1748,"start":417,"end":538},{"cath_id":"1.10.238","chopping":"562-640","consensus_level":"medium","plddt":77.1535,"start":562,"end":640}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5JVL4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5JVL4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5JVL4-F1-predicted_aligned_error_v6.png","plddt_mean":83.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EFHC1","jax_strain_url":"https://www.jax.org/strain/search?query=EFHC1"},"sequence":{"accession":"Q5JVL4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5JVL4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5JVL4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5JVL4"}},"corpus_meta":[{"pmid":"15258581","id":"PMC_15258581","title":"Mutations in EFHC1 cause juvenile myoclonic epilepsy.","date":"2004","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15258581","citation_count":239,"is_preprint":false},{"pmid":"9305351","id":"PMC_9305351","title":"Refined mapping of the epilepsy susceptibility locus EJM1 on chromosome 6.","date":"1997","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/9305351","citation_count":79,"is_preprint":false},{"pmid":"19734894","id":"PMC_19734894","title":"EFHC1 interacts with microtubules to regulate cell division and cortical development.","date":"2009","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/19734894","citation_count":57,"is_preprint":false},{"pmid":"12435737","id":"PMC_12435737","title":"Rib72, a conserved protein associated with the ribbon compartment of flagellar A-microtubules and potentially involved in the linkage between outer doublet microtubules.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12435737","citation_count":57,"is_preprint":false},{"pmid":"19147686","id":"PMC_19147686","title":"Efhc1 deficiency causes spontaneous myoclonus and increased seizure susceptibility.","date":"2009","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19147686","citation_count":56,"is_preprint":false},{"pmid":"15670853","id":"PMC_15670853","title":"The mouse ortholog of EFHC1 implicated in juvenile myoclonic epilepsy is an axonemal protein widely conserved among organisms with motile cilia and flagella.","date":"2005","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/15670853","citation_count":53,"is_preprint":false},{"pmid":"17159113","id":"PMC_17159113","title":"Idiopathic generalized epilepsy phenotypes associated with different EFHC1 mutations.","date":"2006","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/17159113","citation_count":53,"is_preprint":false},{"pmid":"18505993","id":"PMC_18505993","title":"Novel mutations in Myoclonin1/EFHC1 in sporadic and familial juvenile myoclonic epilepsy.","date":"2008","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/18505993","citation_count":48,"is_preprint":false},{"pmid":"16839746","id":"PMC_16839746","title":"Mutations in the GABRA1 and EFHC1 genes are rare in familial juvenile myoclonic epilepsy.","date":"2006","source":"Epilepsy research","url":"https://pubmed.ncbi.nlm.nih.gov/16839746","citation_count":38,"is_preprint":false},{"pmid":"7654068","id":"PMC_7654068","title":"The phenotypic spectrum related to the human epilepsy susceptibility gene \"EJM1\".","date":"1995","source":"Annals of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/7654068","citation_count":38,"is_preprint":false},{"pmid":"22226147","id":"PMC_22226147","title":"The juvenile myoclonic epilepsy-related protein EFHC1 interacts with the redox-sensitive TRPM2 channel linked to cell death.","date":"2012","source":"Cell calcium","url":"https://pubmed.ncbi.nlm.nih.gov/22226147","citation_count":37,"is_preprint":false},{"pmid":"17634063","id":"PMC_17634063","title":"Mutational analysis of EFHC1 gene in Italian families with juvenile myoclonic epilepsy.","date":"2007","source":"Epilepsia","url":"https://pubmed.ncbi.nlm.nih.gov/17634063","citation_count":37,"is_preprint":false},{"pmid":"2117464","id":"PMC_2117464","title":"Characterization of new IgG lambda myeloma plasma cell line (EJM): a further tool in the investigation of the biology of multiple myeloma.","date":"1990","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/2117464","citation_count":35,"is_preprint":false},{"pmid":"22926142","id":"PMC_22926142","title":"Mutations of EFHC1, linked to juvenile myoclonic epilepsy, disrupt radial and tangential migrations during brain 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E&B","url":"https://pubmed.ncbi.nlm.nih.gov/23756481","citation_count":17,"is_preprint":false},{"pmid":"34406789","id":"PMC_34406789","title":"Proteomic analysis of microtubule inner proteins (MIPs) in Rib72 null Tetrahymena cells reveals functional MIPs.","date":"2021","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/34406789","citation_count":15,"is_preprint":false},{"pmid":"21835885","id":"PMC_21835885","title":"Defhc1.1, a homologue of the juvenile myoclonic gene EFHC1, modulates architecture and basal activity of the neuromuscular junction in Drosophila.","date":"2011","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21835885","citation_count":15,"is_preprint":false},{"pmid":"22690745","id":"PMC_22690745","title":"Intractable epilepsy of infancy due to homozygous mutation in the EFHC1 gene.","date":"2012","source":"Epilepsia","url":"https://pubmed.ncbi.nlm.nih.gov/22690745","citation_count":15,"is_preprint":false},{"pmid":"30810526","id":"PMC_30810526","title":"EFHC1, implicated in juvenile myoclonic epilepsy, functions at the cilium and synapse to modulate dopamine signaling.","date":"2019","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/30810526","citation_count":15,"is_preprint":false},{"pmid":"17054699","id":"PMC_17054699","title":"Heterogeneity at the JME 6p11-12 locus: absence of mutations in the EFHC1 gene in linked Dutch families.","date":"2006","source":"Epilepsia","url":"https://pubmed.ncbi.nlm.nih.gov/17054699","citation_count":15,"is_preprint":false},{"pmid":"26783883","id":"PMC_26783883","title":"Identifying domains of EFHC1 involved in ciliary localization, ciliogenesis, and the regulation of Wnt signaling.","date":"2016","source":"Developmental 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JME-associated mutations reverse this current increase and suppress EFHC1-induced apoptosis in hippocampal neurons\",\n      \"method\": \"Co-immunoprecipitation, patch-clamp electrophysiology, neuronal apoptosis assay with pharmacological rescue (SNX-482)\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal Co-IP plus functional electrophysiology with disease-mutant controls, foundational paper with 239 citations\",\n      \"pmids\": [\"15258581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"EFHC1 localizes to the centrosome during interphase and co-localizes with the mitotic spindle (especially spindle poles) and midbody during mitosis/cytokinesis; deletion analysis shows the N-terminal region is required for spindle and midbody association\",\n      \"method\": \"EGFP-fusion live imaging, immunofluorescence with endogenous antibody, deletion constructs in multiple cell lines\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional domain mapping, orthogonal antibody confirmation\",\n      \"pmids\": [\"16824517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"EFHC1 is a microtubule-associated protein (MAP); loss of function disrupts mitotic spindle organization, impairs M-phase progression, induces microtubule bundling, increases apoptosis, and causes radial migration defects in the developing neocortex by impairing cell-cycle exit of cortical progenitors and radial glia scaffold organization\",\n      \"method\": \"In vitro EFHC1 loss-of-function, ex vivo and in utero electroporation in rat neocortex, mitotic spindle imaging\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vitro and in vivo methods in a high-impact paper with 57 citations\",\n      \"pmids\": [\"19734894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Efhc1-deficient mice show reduced ciliary beating frequency in ependymal cilia (despite intact ciliary structure), enlarged brain ventricles, spontaneous myoclonus, and reduced pentylenetetrazol seizure threshold, establishing a loss-of-function epileptic phenotype\",\n      \"method\": \"Knockout mouse generation, ciliary beat frequency measurement, behavioral seizure monitoring, PTZ threshold testing\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple defined phenotypic readouts, 56 citations\",\n      \"pmids\": [\"19147686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The mouse ortholog mRib72-1/Efhc1 is a homolog of the Chlamydomonas axonemal protein Rib72 and is abundantly present in sperm flagella and tracheal cilia (motile cilia) but only in small amounts in the brain; it is absent from immotile primary cilia\",\n      \"method\": \"Western blot analysis and immunofluorescence localization in mouse tissues\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by immunofluorescence and western blot, replicated in subsequent studies\",\n      \"pmids\": [\"15670853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"EFHC1 physically interacts with both the N- and C-terminal cytoplasmic regions of the TRPM2 channel (demonstrated by immunoprecipitation); co-expression of EFHC1 potentiates H2O2- and ADPR-induced Ca2+ responses and cationic currents via TRPM2, and enhances TRPM2-mediated cell death susceptibility; JME mutations reverse these effects\",\n      \"method\": \"Co-immunoprecipitation, Ca2+ imaging, whole-cell patch-clamp in HEK293 cells, cell death assay with JME mutants\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal Co-IP plus functional electrophysiology and cell death assays with disease-mutant validation\",\n      \"pmids\": [\"22226147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"JME mutations in EFHC1 (including F229L) act in a dominant-negative manner to impair mitotic spindle organization; mutant EFHC1 expression disrupts radial and tangential neuronal migration by affecting radial glia morphology and migrating neuron morphology, while not altering centrosome/spindle colocalization\",\n      \"method\": \"Ex vivo electroporation with mutant constructs, immunofluorescence of mitotic spindles and radial glia, neuronal migration assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple mutant constructs tested with orthogonal migration and spindle assays, extends prior findings\",\n      \"pmids\": [\"22926142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The C-terminal half of EFHC1 (residues 403–640), which contains the EF-hand motif, can dimerize via disulfide bond through Cys575; dimerization under oxidizing conditions blocks Ca2+ and Mg2+ binding to the EF-hand (1:1 binding stoichiometry under reducing but not oxidizing conditions)\",\n      \"method\": \"Size exclusion chromatography, mass spectrometry, tandem MS/MS, DTNB thiol assay, isothermal titration calorimetry\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biochemical/biophysical methods establishing Ca2+/Mg2+ binding and dimer mechanism\",\n      \"pmids\": [\"18593566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Drosophila Defhc1.1 (EFHC1 ortholog) binds to microtubules in vitro and co-localizes with axonal and synaptic microtubules in vivo; its loss reduces microtubule loops at synaptic terminals, increases satellite boutons and spontaneous neurotransmitter release, and expands the dendritic arbor; pharmacological inhibition of microtubule dynamics (vinblastine) suppresses the satellite bouton phenotype, establishing EFHC1 as a negative regulator of microtubule dynamics at synapses\",\n      \"method\": \"Drosophila KO, in vitro microtubule binding, immunofluorescence, electrophysiology (mEPSPs), vinblastine pharmacological rescue, dendritic morphometry\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro binding assay plus in vivo KO with pharmacological rescue and multiple orthogonal readouts\",\n      \"pmids\": [\"21835885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In Xenopus laevis, EFHC1b morpholino knockdown inhibits multiciliated cell formation and specifically blocks axoneme (but not basal body) formation; EFHC1b-GFP localizes to ciliary axonemes; knockdown increases Wnt8a RNA levels and activates β-catenin/TOPFLASH reporter; the Wnt-related phenotypes are rescued by a truncated EFHC1b lacking full ciliary-localization sequences, while axonemal phenotypes require the full-length protein\",\n      \"method\": \"Xenopus morpholino knockdown, GFP-fusion localization, TOPFLASH reporter assay, domain-deletion rescue experiments, in situ hybridization\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — morpholino KD with domain-specific rescue experiments and multiple orthogonal readouts in Xenopus\",\n      \"pmids\": [\"26783883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"C. elegans EFHC-1 functions within non-motile mechanosensory cilia to regulate neuronal activation; it also localizes at the synapse where it modulates dopamine signaling in cooperation with the R-type voltage-gated calcium channel ortholog, revealing a dual regulation of neuronal excitability at cilium and synapse\",\n      \"method\": \"C. elegans genetics, live imaging, behavioral assays, dopamine signaling readouts, epistasis with R-type VGCC ortholog\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis combined with localization and multiple behavioral/signaling readouts in an ortholog model\",\n      \"pmids\": [\"30810526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Using a validated monoclonal antibody (6A3-mAb) and Efhc1-/- mice as negative controls, myoclonin1 is detected only in cells with motile cilia (ependymal cells, choroid plexus, trachea, sperm) but not in neurons or at the mitotic spindle/midbody; complete elimination of myoclonin1 does not affect cell division or neuronal migration in the cerebral cortex\",\n      \"method\": \"Immunohistochemistry and western blot with monoclonal antibody validated in Efhc1-/- mice, immunocytochemistry in dividing cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — rigorous antibody validation with KO negative controls and multiple imaging modalities\",\n      \"pmids\": [\"33328576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Myoclonin1/EFHC1 is sequentially expressed in choroid plexus epithelial cells (embryonic), then ependymal cell cilia lining ventricle walls (postnatal to adult), as well as tracheal cilia and sperm flagella; it is absent from choroid plexus in adults; localization verified using Efhc1-deficient mice as negative controls\",\n      \"method\": \"Immunohistochemistry and in situ hybridization in mouse across developmental stages, validated in Efhc1-KO\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — localization with KO negative controls, but functional consequence not directly established in this study\",\n      \"pmids\": [\"18164683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Selective deletion of myoclonin1 in choroid plexus and ependymal cells (FoxJ1-Cre × floxed-Efhc1) produces increased PTZ seizure susceptibility in adult heterozygotes and enlarged brain ventricles in homozygotes, partially recapitulating the systemic Efhc1-KO phenotype and establishing that loss of myoclonin1 specifically in motile-ciliated cells contributes to epileptic pathophysiology\",\n      \"method\": \"Conditional KO mouse (FoxJ1-Cre driver), PTZ seizure threshold testing, brain ventricle morphometry\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KO with defined phenotypic readouts linking motile-ciliated cell function to epilepsy\",\n      \"pmids\": [\"42000019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Myoclonin1 co-localizes with and physically binds to IP3 receptor type 1 (IP3R1) in choroid plexus and ependymal cells; Efhc1-/- cells show elevated ER Ca2+ stores and enhanced IP3-induced Ca2+ release; myoclonin1 also interacts with PRKCSH (80K-H), a known IP3R1-interacting protein, and binds IP3R2 and IP3R3, indicating that myoclonin1 modulates ER-Ca2+ homeostasis through IP3R interactions\",\n      \"method\": \"Co-immunoprecipitation, Ca2+ imaging in Efhc1-/- vs WT cells, co-localization imaging\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional Ca2+ measurements in KO cells; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.07.01.601633\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"EFHC1 (myoclonin1) is primarily expressed in motile-cilia-bearing cells (choroid plexus, ependymal cells, trachea, sperm flagella) where it functions as a microtubule-associated axonemal protein that regulates ciliary beat frequency, ER-Ca2+ homeostasis via IP3R interactions, and modulates Ca2+ signaling through physical interactions with Cav2.3 (R-type VDCC) and TRPM2 channels; in developing brain it also acts as a negative regulator of microtubule dynamics necessary for mitotic spindle organization and neuronal migration, while at the synapse (established in C. elegans and Drosophila orthologs) it restrains neurite/dendritic overgrowth and spontaneous neurotransmitter release, with JME-causing mutations acting dominantly to impair these functions and thereby disrupt neuronal circuit development and excitability thresholds.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"EFHC1 (myoclonin1) is a microtubule-associated, EF-hand-containing axonemal protein predominantly expressed in motile-cilia-bearing cells—choroid plexus, ependymal cells, trachea, and sperm flagella—where it regulates ciliary beat frequency, axoneme assembly, and calcium homeostasis [PMID:15670853, PMID:18164683, PMID:33328576, PMID:26783883]. EFHC1 modulates neuronal excitability through physical interactions with the R-type voltage-gated calcium channel Cav2.3 and the TRPM2 channel, enhancing their Ca²⁺ currents, and through regulation of ER-Ca²⁺ release via IP3 receptors; JME-causing mutations reverse these functional effects [PMID:15258581, PMID:22226147]. In invertebrate models, EFHC1 orthologs bind microtubules directly, restrain synaptic overgrowth and spontaneous neurotransmitter release, and regulate mechanosensory cilium and synapse function in cooperation with R-type calcium channels [PMID:21835885, PMID:30810526]. Loss of EFHC1 specifically in motile-ciliated cells produces increased seizure susceptibility and ventriculomegaly, establishing that its ciliary function contributes directly to the epileptic phenotype of juvenile myoclonic epilepsy [PMID:19147686, PMID:42000019].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that EFHC1 is a functional modulator of a specific ion channel answered how a newly identified epilepsy gene could alter neuronal excitability: EFHC1 physically interacts with Cav2.3 and increases R-type Ca²⁺ currents, with JME mutations abolishing this effect and suppressing pro-apoptotic activity.\",\n      \"evidence\": \"Co-immunoprecipitation, patch-clamp electrophysiology, and apoptosis assays with pharmacological validation in hippocampal neurons\",\n      \"pmids\": [\"15258581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which EFHC1 potentiates Cav2.3 currents not resolved\", \"In vivo relevance of EFHC1-induced apoptosis unclear\", \"Whether the interaction is direct or mediated by a complex not determined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolving where endogenous EFHC1 protein resides answered a critical cell-biological question: EFHC1 is a motile-cilia/flagella protein homologous to Chlamydomonas axonemal Rib72, abundantly present in sperm and trachea but scarce in brain and absent from primary cilia.\",\n      \"evidence\": \"Western blot and immunofluorescence in mouse tissues\",\n      \"pmids\": [\"15670853\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role in motile cilia not yet tested\", \"Brain expression level low—functional significance in neurons ambiguous\", \"Antibody specificity not validated against KO at this time\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrating centrosome and mitotic spindle localization raised the possibility that EFHC1 has a cell-division role beyond cilia, with N-terminal domain mapping showing requirements for spindle and midbody association.\",\n      \"evidence\": \"EGFP-fusion live imaging and immunofluorescence with deletion constructs in mammalian cell lines\",\n      \"pmids\": [\"16824517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether endogenous EFHC1 at spindle is functionally required not tested\", \"Spindle localization later contested by KO-validated antibody study (PMID:33328576)\", \"Relevance to in vivo cell division unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping developmental expression dynamics in choroid plexus and ependyma clarified that EFHC1 is sequentially deployed in specific motile-ciliated cell populations across brain development.\",\n      \"evidence\": \"Immunohistochemistry and in situ hybridization across mouse developmental stages, validated in Efhc1-KO tissue\",\n      \"pmids\": [\"18164683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of developmental switch in expression not tested\", \"Whether brain expression extends to neurons still debated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Biochemical characterization of the C-terminal EF-hand domain established that EFHC1 is a redox-sensitive calcium sensor: it binds Ca²⁺/Mg²⁺ at 1:1 stoichiometry under reducing conditions but dimerizes via Cys575 disulfide under oxidizing conditions, which blocks divalent cation binding.\",\n      \"evidence\": \"Size exclusion chromatography, mass spectrometry, thiol assay, and isothermal titration calorimetry on purified C-terminal fragment\",\n      \"pmids\": [\"18593566\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of redox-regulated dimerization untested in cells\", \"Whether full-length protein behaves similarly unknown\", \"No structural model available\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Two landmark studies established that EFHC1 loss of function has both ciliary and neurodevelopmental consequences: knockout mice show reduced ependymal ciliary beat frequency, ventriculomegaly, myoclonus, and lowered seizure threshold, while in developing rat cortex, EFHC1 knockdown disrupts mitotic spindle organization and radial neuronal migration.\",\n      \"evidence\": \"Efhc1-KO mice with ciliary beat frequency, behavioral and PTZ seizure phenotyping; in utero electroporation and spindle imaging in rat neocortex\",\n      \"pmids\": [\"19147686\", \"19734894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of ciliary vs. neuronal migration defects to seizure phenotype unclear\", \"Whether spindle phenotype reflects endogenous neuronal EFHC1 later challenged\", \"Mechanism linking reduced ciliary beat frequency to seizures not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Drosophila ortholog studies answered whether EFHC1 directly binds microtubules and regulates synaptic architecture: Defhc1.1 binds microtubules in vitro, and its loss increases synaptic boutons and spontaneous neurotransmitter release—phenotypes suppressed by the microtubule-stabilizing drug vinblastine—establishing EFHC1 as a negative regulator of microtubule dynamics at synapses.\",\n      \"evidence\": \"Drosophila KO, in vitro microtubule binding assay, electrophysiology, vinblastine rescue, dendritic morphometry\",\n      \"pmids\": [\"21835885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian synaptic function of EFHC1 not confirmed\", \"Direct microtubule binding not demonstrated for mammalian protein\", \"Whether synaptic phenotype is cell-autonomous not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Two studies extended the ion channel and neurodevelopmental story: EFHC1 physically interacts with TRPM2 to potentiate oxidative stress-induced Ca²⁺ entry (reversed by JME mutations), and JME mutations act dominant-negatively to disrupt mitotic spindle organization and both radial and tangential neuronal migration.\",\n      \"evidence\": \"Co-IP, patch-clamp, and cell death assays in HEK293 for TRPM2; ex vivo electroporation with mutant constructs and migration/spindle assays for neuronal migration\",\n      \"pmids\": [\"22226147\", \"22926142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of TRPM2 interaction to epilepsy not tested\", \"Dominant-negative mechanism at molecular level unresolved\", \"Whether neuronal migration defects are primary or secondary to spindle disruption unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Xenopus studies revealed EFHC1 is required for axoneme assembly in multiciliated cells and identified a separable role in restraining Wnt/β-catenin signaling, linking EFHC1 to a major developmental signaling pathway.\",\n      \"evidence\": \"Morpholino knockdown in Xenopus with GFP-fusion localization, TOPFLASH reporter, and domain-deletion rescue\",\n      \"pmids\": [\"26783883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Wnt pathway modulation unknown\", \"Whether Wnt regulation occurs in mammalian ciliated cells not tested\", \"Relationship between Wnt modulation and epilepsy unexplored\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"C. elegans studies demonstrated that EFHC-1 functions in both non-motile mechanosensory cilia and at synapses to regulate neuronal excitability, cooperating with the R-type VGCC ortholog—extending the Cav2.3 interaction to an in vivo dual-site regulatory model.\",\n      \"evidence\": \"C. elegans genetics, live imaging, behavioral assays, epistasis with R-type VGCC ortholog\",\n      \"pmids\": [\"30810526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether dual ciliary-synaptic regulation applies in mammalian neurons not confirmed\", \"Molecular mechanism of cooperation with R-type VGCC at synapse unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A rigorous antibody validation study using Efhc1-KO controls challenged earlier neuronal and spindle localizations: KO-validated monoclonal antibody detected myoclonin1 only in motile-ciliated cells, not in neurons or at the mitotic spindle, and complete Efhc1 elimination did not affect cell division or cortical neuronal migration.\",\n      \"evidence\": \"Immunohistochemistry and western blot with KO-validated monoclonal antibody (6A3-mAb), immunocytochemistry in dividing cells\",\n      \"pmids\": [\"33328576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Discrepancy with earlier spindle/neuron findings not fully reconciled—may reflect overexpression artifacts vs. endogenous protein\", \"Does not rule out low-level neuronal expression below detection\", \"Functional role that produces seizure phenotype if protein is absent from neurons needs alternative explanation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of IP3R1 as a physical binding partner in choroid plexus/ependymal cells, with loss of EFHC1 causing elevated ER Ca²⁺ stores and enhanced IP3-induced Ca²⁺ release, provided a molecular mechanism for EFHC1's role in calcium homeostasis within its primary expression domain.\",\n      \"evidence\": \"(preprint) Co-immunoprecipitation, Ca²⁺ imaging in Efhc1-KO vs. WT choroid plexus/ependymal cells\",\n      \"pmids\": [\"bio_10.1101_2024.07.01.601633\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint awaiting peer review\", \"Whether ER-Ca²⁺ dysregulation is causally linked to seizure susceptibility not tested\", \"Stoichiometry and structural basis of IP3R interaction unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Cell-type-specific conditional deletion established that loss of myoclonin1 specifically in motile-ciliated (FoxJ1+) cells is sufficient to increase seizure susceptibility, directly linking ciliary dysfunction to the epileptic phenotype and resolving a long-standing question about the relevant cell type.\",\n      \"evidence\": \"Conditional KO mouse (FoxJ1-Cre × floxed-Efhc1), PTZ seizure threshold testing, ventricle morphometry\",\n      \"pmids\": [\"42000019\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Heterozygote seizure phenotype suggests haploinsufficiency but mechanism not resolved\", \"How ciliary dysfunction in ependyma/choroid plexus lowers seizure threshold remains unknown\", \"Whether additional non-ciliated cell contributions exist cannot be excluded\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The central unresolved question is the mechanism by which EFHC1 loss in motile-ciliated ependymal/choroid plexus cells leads to altered neuronal excitability and seizure susceptibility—whether through CSF composition changes, Wnt signaling, Ca²⁺ homeostasis perturbation, or another pathway.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct link established between ciliary beat/ER-Ca²⁺ defect and circuit-level hyperexcitability\", \"Mammalian synaptic function of EFHC1 not demonstrated with endogenous protein\", \"No high-resolution structure of EFHC1 or its complexes available\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 2, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [3, 4, 9, 11, 12, 13]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 2, 8]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 10]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3, 9, 13]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 8, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CACNA1E\",\n      \"TRPM2\",\n      \"ITPR1\",\n      \"PRKCSH\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}