{"gene":"ELP1","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1998,"finding":"IKAP (ELP1) was identified as a scaffold protein of the IκB kinase complex, capable of binding NIK, IKK-α, and IKK-β and assembling them into an active kinase complex, as demonstrated by isolation of large IL-1-inducible IKK complexes containing NIK, IKK-α, IKK-β, IκB-α, NF-κB/RelA, and IKAP.","method":"Biochemical co-purification and complex isolation from IL-1-stimulated cells; protein identification by mass spectrometry","journal":"Nature","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal co-purification with multiple binding partners; single lab but multiple components identified","pmids":["9751059"],"is_preprint":false},{"year":2000,"finding":"IKAP is not a stoichiometric component of the IKK complex and plays no specific role in cytokine-induced NF-κB activation; IKKγ/NEMO was identified as the obligatory scaffold subunit. Antisense-mediated reduction of IKAP had no effect on IKK activity or NF-κB signaling, whereas IKKγ reduction did.","method":"Quantitative co-immunoprecipitation, antisense oligonucleotide knockdown, NF-κB reporter assay, in vitro reconstitution of IKK complex with IKKα/β/γ only","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution of IKK complex without IKAP plus functional knockdown; orthogonal methods in single rigorous study","pmids":["10893415"],"is_preprint":false},{"year":2001,"finding":"The major FD-causing mutation is a T→C transition at the donor splice site of intron 20 of IKBKAP, resulting in tissue-specific skipping of exon 20 and production of a truncated, non-functional IKAP protein; a minor missense mutation R696P in exon 19 disrupts a consensus serine/threonine kinase phosphorylation site and causes defective phosphorylation of IKAP.","method":"Genomic sequencing, RT-PCR, tissue-specific RNA analysis from lymphoblasts and brain, protein analysis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — independently replicated by two simultaneous publications using sequencing plus functional RNA/protein analysis","pmids":["11179008","11179021"],"is_preprint":false},{"year":2003,"finding":"Tissue-specific reduction in wild-type IKBKAP splicing efficiency underlies the selective neuronal degeneration in FD; WT:mutant IKBKAP transcript ratios are highest in lymphoblasts and lowest in postmortem central and peripheral nervous tissues, with corresponding reduction in WT IKAP protein.","method":"Densitometry and real-time quantitative PCR on RNA from lymphoblasts, fibroblasts, blood, and postmortem tissues; immunoblotting for protein","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple tissue types, two quantitative methods, strong mechanistic link between splicing ratio and neuropathology","pmids":["12577200"],"is_preprint":false},{"year":2003,"finding":"Weak intrinsic splicing signals flanking IKBKAP exon 20 (weak 3' splice site and weak exonic sequences) underlie the FD splicing defect; the position-6 mutation in the 5' splice site causes exon skipping only in the context of these pre-existing weak signals, as validated by in vitro coupled RNAPII transcription/splicing assay and minigene transfection.","method":"Computational splice-site analysis, in vitro RNAPII-coupled transcription/splicing assay, minigene transfection assays","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro reconstitution assay combined with in vivo minigene validation; orthogonal methods","pmids":["16964593"],"is_preprint":false},{"year":2008,"finding":"IKAP (ELP1) localizes to membrane ruffles where it co-localizes with filamin A; RNAi-mediated depletion of IKAP causes defective cell adhesion, migration, and actin cytoskeleton organization in multiple cell types including primary neurons, effects rescued by wild-type IKAP but not by the FD-truncated form.","method":"RNAi knockdown, immunostaining, co-purification with filamin A, rescue experiments with wild-type vs. FD-IKAP, migration assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-purification, multiple cell types, rescue with wild-type vs. mutant protein, localization with functional consequence","pmids":["18303054"],"is_preprint":false},{"year":2008,"finding":"Loss of Ikbkap in mouse embryos causes embryonic lethality by E12.5 with defects in vascular and neural development; Ikbkap-null embryos show downregulation of genes important for neurulation and vascular development correlated with a defect in transcriptional elongation-coupled histone acetylation.","method":"Conditional knockout mouse, morphological analysis, microarray/gene expression analysis, histone acetylation assay, rescue with human IKBKAP transgene","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific phenotypic readouts plus mechanistic biochemical assay (histone acetylation) and transgenic rescue","pmids":["19015235"],"is_preprint":false},{"year":2011,"finding":"IKAP/Elp1 deficiency causes disorganization of microtubules and aberrant cell shape; SCG10 (STMN2), a microtubule-destabilizing protein, is upregulated in IKAP-deficient cells, and REST (a repressor of SCG10) is downregulated in IKAP-deficient neuroblastoma cells and FD cerebrum, providing a mechanistic link between IKAP deficiency and cytoskeletal destabilization.","method":"Immunostaining of α-tubulin in IKAP knockdown cell lines and FD tissues, western blot and RT-PCR for SCG10 and REST in FD cerebrum and fibroblasts","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, immunostaining and expression analysis, mechanistic pathway inferred but not directly reconstituted","pmids":["21273291"],"is_preprint":false},{"year":2011,"finding":"Deletion of exon 20 of Ikbkap abolishes gene function, causing developmental delay, cardiovascular defects, and early embryonic lethality; IKAP is essential for expression of specific genes involved in cardiac morphogenesis, and the FD-truncated protein lacks significant biological function.","method":"Homologous recombination to generate exon-20 deletion allele in mice, embryological analysis, gene expression profiling","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — clean KO with allele-specific phenotype; genetic proof that exon 20 deletion abolishes function","pmids":["22046433"],"is_preprint":false},{"year":2012,"finding":"IKAP/Elp1 is not required for neural crest cell migration but is essential for post-migratory neuronal differentiation and survival; gain- and loss-of-function studies in chick embryos show IKAP is expressed as neurons differentiate and that altered IKAP levels perturb neuronal polarity, differentiation, and survival.","method":"RNAi knockdown in neural crest lineage in ovo, gain-of-function overexpression, reporter gene analysis, immunostaining for IKAP expression pattern","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — both gain and loss of function in vivo with specific cellular phenotypes; expression pattern defines mechanism","pmids":["22384137"],"is_preprint":false},{"year":2013,"finding":"Ikbkap is essential for the second wave of neurogenesis producing TrkA+ nociceptors and thermoreceptors; in its absence, Pax3+ progenitors undergo p53-mediated premature differentiation and death, and TrkA+ (but not TrkC+) sensory and sympathetic neurons undergo exacerbated caspase-3-mediated apoptosis independent of NGF levels.","method":"Conditional knockout (PNS-specific Ikbkap deletion), immunostaining, apoptosis assays (caspase-3), neuronal counting, genetic epistasis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with mechanistic identification of apoptotic pathway (p53, caspase-3) and cell-type specificity","pmids":["24173031"],"is_preprint":false},{"year":2013,"finding":"Ikbkap/Elp1 is essential for meiosis during spermatogenesis; absence causes defects in synapsis and meiotic recombination leading to apoptosis and complete gametogenesis arrest. Additionally, Ikbkap-mutant testes show defects in wobble uridine tRNA modification, confirming a conserved tRNA modification function from yeast to mammals.","method":"Conditional knockout mouse (spermatocyte-specific), cytological analysis of meiotic spread chromosomes, tRNA modification analysis, gene expression profiling","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific meiotic phenotype and direct biochemical measurement of tRNA modification","pmids":["23717213"],"is_preprint":false},{"year":2014,"finding":"Elp1 (ELP1) loss in post-migratory sympathetic neurons causes failed target tissue innervation correlated with abnormal neurite outgrowth/branching and abnormal cellular distribution of soluble tyrosinated α-tubulin, indicating a role for Elp1 in cytoskeletal regulation required for innervation.","method":"Conditional knockout of Elp1 in neural crest progenitors and post-migratory sympathetic neurons, immunostaining for tyrosinated α-tubulin, neurite morphology analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KO with direct localization/morphology phenotype linked to cytoskeletal mechanism","pmids":["24917501"],"is_preprint":false},{"year":2014,"finding":"IKAP colocalizes with activated JNK (pJNK), dynein, and β-tubulin at axon terminals of DRG neurons, and is required for transport of specific target-derived signals for JNK and NGF responsive gene transcription in the nucleus.","method":"Immunostaining and colocalization analysis in chick DRG neurons; shRNA knockdown of IKAP followed by JNK signaling and gene expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 — colocalization with functional knockdown; single lab, no direct reconstitution of transport complex","pmids":["25409162"],"is_preprint":false},{"year":2014,"finding":"The C-terminal basic (arginine/lysine-rich) region of yeast Elp1 is essential for Elongator tRNA wobble uridine modification function by mediating a direct interaction between tRNA and the Elp1 C-terminal domain, rather than controlling nucleo-cytoplasmic distribution.","method":"Alanine substitution mutagenesis, tRNA modification assays, tRNA-binding assays with Elp1 C-terminal domain, subcellular fractionation","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis with direct tRNA binding assay; establishes the molecular basis of tRNA interaction","pmids":["24750273"],"is_preprint":false},{"year":2015,"finding":"The yeast casein kinase I Hrr25 directly phosphorylates Elp1 on Ser-1198 and Ser-1202 at its C-terminus adjacent to the tRNA-binding region; phosphorylation at these sites positively regulates Elongator's tRNA modification function and modulates interactions with accessory protein Kti12 and Hrr25 itself.","method":"In vivo phosphorylation site mapping (mass spectrometry), in vitro kinase assay with Hrr25, alanine and phosphomimetic substitutions at identified sites, tRNA modification functional assays","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay plus mutagenesis at specific sites validated by functional tRNA modification assay","pmids":["25569479"],"is_preprint":false},{"year":2017,"finding":"Ikbkap is required not only in the PNS but also in the CNS; conditional deletion in the nervous system disrupts cortical neuron development and survival, reduces primary cilia in embryonic cortical apical progenitors and motile cilia in adult ependymal cells, and causes progressive loss of spinal motor and cortical neurons.","method":"Nervous-system-specific conditional knockout mouse, immunostaining, neuron counting, cilia morphology analysis, behavioral assays","journal":"Disease models & mechanisms","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional KO with multiple specific cellular phenotypes (cilia defects, neurodegeneration)","pmids":["28167615"],"is_preprint":false},{"year":2018,"finding":"Loss of IKAP in retinal ganglion cells causes mitochondrial membrane depolarization, impaired complex I function, and reduced ATP, leading to selective RGC degeneration; other retinal neurons show mitochondrial impairment but do not degenerate, implicating RGC-specific mitochondrial vulnerability.","method":"Retina-specific conditional knockout (Pax6-Cre), mitochondrial membrane potential assay, complex I activity assay, ATP measurement, immunostaining, cell counting","journal":"Disease models & mechanisms","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with direct biochemical measurement of mitochondrial function parameters linked to degeneration phenotype","pmids":["29929962"],"is_preprint":false},{"year":2018,"finding":"hnRNP A1 binds to an intronic splicing silencer downstream of the IKBKAP exon 20 5' splice site and to two inhibitory intronic splicing elements inside exon 20, acting as a negative regulator of exon 20 inclusion; knockdown of hnRNP A1 increases exon 20 inclusion in FD patient cells.","method":"RNA binding assays, site-directed mutagenesis of SREs in minigene, hnRNP A1 knockdown in FD patient fibroblasts, splice-switching oligonucleotides blocking hnRNP A1 binding site","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 — direct binding assay, mutagenesis, knockdown with functional exon-inclusion readout; multiple orthogonal methods","pmids":["29762696"],"is_preprint":false},{"year":2018,"finding":"Antisense oligonucleotides targeting intronic regions adjacent to IKBKAP exon 20 can fully restore exon 20 splicing in FD patient fibroblasts and increase full-length IKAP protein in multiple tissues including CNS of FD transgenic mice; cis-acting regulatory sequences controlling exon 20 recognition were characterized.","method":"Two-step ASO screen, minigene splicing assays, ASO administration in FD transgenic mice, RT-PCR and western blot for IKBKAP mRNA and IKAP protein in multiple tissues","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — in vitro and in vivo ASO rescue with defined mechanistic target; multiple tissue validation","pmids":["29672717"],"is_preprint":false},{"year":2021,"finding":"Exon 20 inclusion in IKBKAP is promoted by SRSF6 binding to an intronic splicing enhancer in intron 20; the small molecule RECTAS directly interacts with CDC-like kinases (CLKs) and enhances SRSF6 phosphorylation, thereby promoting exon 20 inclusion. Conversely, CLK inhibition reduces exon 20 splicing, and exon 20 splicing can be bidirectionally manipulated by targeting CLK activity.","method":"Knockdown of SRSF6 and other SR proteins, direct binding assay of RECTAS to CLKs, phosphorylation assays for SRSF6, minigene splicing assays, patient-derived cell lines and FD disease models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — direct drug-target binding, kinase phosphorylation assay, genetic knockdown with bidirectional functional readout; validated in multiple FD models","pmids":["34301951"],"is_preprint":false},{"year":2012,"finding":"SKF-86466 (an alpha-2 adrenergic receptor antagonist) rescues IKBKAP expression in FD iPSC-derived neural crest precursors by inducing IKBKAP transcription through modulation of intracellular cAMP levels and PKA-dependent CREB phosphorylation, implicating the alpha-2 adrenergic receptor/cAMP/PKA/CREB pathway in regulating IKBKAP expression.","method":"iPSC-derived neural crest precursor screen of 6,912 compounds, cAMP measurement, PKA inhibitor experiments, CREB phosphorylation assay, IKAP protein rescue assay","journal":"Nature biotechnology","confidence":"High","confidence_rationale":"Tier 2 — multiple pharmacological and biochemical assays identifying pathway; large-scale screen with mechanistic follow-up","pmids":["23159879"],"is_preprint":false},{"year":2013,"finding":"Cardiac glycoside digoxin corrects FD-associated aberrant IKBKAP splicing by suppressing SRSF3 protein levels; SRSF3 binding site(s) in the intron 5' of exon 20 are required for this effect, identifying SRSF3 as a negative regulator of exon 20 inclusion.","method":"RT-PCR splicing assay, SRSF3 knockdown, cis-element mutagenesis, digoxin treatment in FD patient cells and neuronal cells","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2–3 — functional knockdown plus cis-element mutagenesis; single lab study","pmids":["23711097"],"is_preprint":false}],"current_model":"ELP1 (IKAP) is the largest subunit of the Elongator complex with established roles in transcriptional elongation-coupled histone acetylation and tRNA wobble-uridine modification (the latter requiring direct tRNA binding via its C-terminal basic region and positive regulation by CLK-mediated phosphorylation of SRSF6); in neurons, ELP1 additionally regulates cytoskeletal organization (microtubule dynamics, filamin A interaction at membrane ruffles), axonal transport, and target tissue innervation, while its loss causes selective mitochondrial dysfunction and apoptosis of sensory/autonomic neurons—defects arising from a tissue-specific splicing mutation that reduces full-length ELP1 protein in the nervous system and underlies familial dysautonomia."},"narrative":{"teleology":[{"year":1998,"claim":"Initial identification of IKAP as a putative IκB kinase scaffold raised the question of whether ELP1 functions in NF-κB signaling, but this was definitively refuted when IKAP proved dispensable for IKK activity and NF-κB activation.","evidence":"Biochemical co-purification from IL-1-stimulated cells (1998) followed by quantitative co-IP, antisense knockdown, and in vitro reconstitution showing IKAP is not a stoichiometric IKK component (2000)","pmids":["9751059","10893415"],"confidence":"High","gaps":["The reason IKAP co-purified with the IKK complex in the original study has not been explained"]},{"year":2001,"claim":"Identification of the FD-causing splice-site mutation in IKBKAP intron 20 and the demonstration that tissue-specific exon 20 skipping is most severe in the nervous system established the molecular basis of familial dysautonomia and explained its selective neuronal pathology.","evidence":"Genomic sequencing and RT-PCR in patient lymphoblasts and brain tissues (2001), followed by quantitative tissue-specific splicing ratio analysis across multiple organs (2003)","pmids":["11179008","11179021","12577200"],"confidence":"High","gaps":["The trans-acting factors responsible for tissue-specific splicing efficiency were not yet identified","Why the nervous system has the lowest WT:mutant transcript ratio was not mechanistically explained"]},{"year":2003,"claim":"Characterization of the weak intrinsic splicing signals flanking exon 20 explained why the position-6 splice-site mutation causes exon skipping specifically in this context, establishing a cis-regulatory framework for the FD splicing defect.","evidence":"Computational splice-site analysis combined with in vitro RNAPII-coupled transcription/splicing assay and minigene transfection","pmids":["16964593"],"confidence":"High","gaps":["Identity of tissue-specific trans-acting splicing regulators was still unknown"]},{"year":2008,"claim":"Discovery that ELP1 localizes to membrane ruffles with filamin A and that its loss disrupts cell adhesion, migration, and actin organization established a direct cytoskeletal role beyond transcriptional functions.","evidence":"RNAi knockdown with rescue by wild-type but not FD-truncated IKAP in multiple cell types including primary neurons; co-purification with filamin A","pmids":["18303054"],"confidence":"High","gaps":["Whether cytoskeletal defects are direct or secondary to tRNA modification/translational defects was not resolved"]},{"year":2008,"claim":"Knockout studies in mice proved ELP1 is essential for embryonic viability and linked its loss to defective transcriptional elongation-coupled histone acetylation, establishing the Elongator complex function as physiologically critical in mammals.","evidence":"Ikbkap-null and exon-20-deletion mice showing embryonic lethality with vascular/neural defects; histone acetylation assay and transgenic rescue","pmids":["19015235","22046433"],"confidence":"High","gaps":["Relative contributions of histone acetylation versus tRNA modification to the embryonic phenotype were not disentangled"]},{"year":2013,"claim":"Cell-type-specific conditional knockouts revealed that ELP1 is essential for TrkA+ nociceptor neurogenesis and survival via suppression of p53-mediated premature differentiation and caspase-3-dependent apoptosis, explaining the selective sensory neuron loss in FD.","evidence":"PNS-specific Ikbkap conditional KO with caspase-3 immunostaining, neuronal subtype counting, and genetic epistasis","pmids":["24173031"],"confidence":"High","gaps":["How ELP1 loss activates p53 was not determined","Whether the apoptosis mechanism differs between sensory and sympathetic neurons was not resolved"]},{"year":2013,"claim":"A conserved tRNA wobble-uridine modification function was confirmed in mammals when Ikbkap-mutant testes showed tRNA modification defects alongside meiotic failure, and yeast studies mapped this activity to direct tRNA binding by the Elp1 C-terminal basic region.","evidence":"Spermatocyte-specific conditional KO with tRNA modification analysis (2013); alanine mutagenesis of Elp1 C-terminal domain with direct tRNA binding assay in yeast (2014)","pmids":["23717213","24750273"],"confidence":"High","gaps":["Whether tRNA modification defects directly cause the meiotic phenotype or act through downstream translational effects was not tested"]},{"year":2014,"claim":"ELP1 was shown to regulate microtubule dynamics and axonal transport in neurons: its loss disrupts tyrosinated α-tubulin distribution and target innervation in sympathetic neurons, and it colocalizes with dynein and pJNK at axon terminals to facilitate retrograde signaling.","evidence":"Conditional KO of Elp1 in post-migratory sympathetic neurons with tubulin immunostaining; shRNA knockdown in chick DRG neurons with JNK signaling analysis","pmids":["24917501","25409162"],"confidence":"High","gaps":["Direct reconstitution of an ELP1-dynein transport complex has not been achieved","Whether cytoskeletal defects reflect tRNA-modification-dependent translational effects on tubulin-modifying enzymes is unresolved"]},{"year":2015,"claim":"Phosphorylation of Elp1 by casein kinase I Hrr25 at C-terminal serines adjacent to the tRNA-binding region was shown to positively regulate Elongator tRNA modification activity, establishing a regulatory switch controlling Elongator function.","evidence":"In vitro kinase assay with Hrr25, mass-spectrometry-based phosphosite mapping, phosphomimetic/alanine substitutions with tRNA modification functional readout in yeast","pmids":["25569479"],"confidence":"High","gaps":["Whether the mammalian orthologous kinase CK1 performs the equivalent regulation has not been tested","How phosphorylation mechanistically alters tRNA binding or catalysis is unknown"]},{"year":2017,"claim":"CNS-specific ELP1 functions were uncovered: conditional deletion disrupts cortical neuron development, primary and motile cilia formation, and causes progressive motor and cortical neurodegeneration, broadening FD pathology beyond the PNS.","evidence":"Nervous-system-specific conditional KO mouse with cilia morphology analysis, neuron counting, and behavioral assays","pmids":["28167615"],"confidence":"High","gaps":["Mechanism linking ELP1 to ciliogenesis is unknown","Whether cilia defects contribute to neurodegeneration or are parallel consequences is unclear"]},{"year":2018,"claim":"ELP1 loss was linked to selective mitochondrial dysfunction: retinal ganglion cells lacking IKAP show mitochondrial membrane depolarization and impaired complex I activity, revealing a mitochondrial vulnerability mechanism for neurodegeneration.","evidence":"Retina-specific conditional KO with mitochondrial membrane potential, complex I activity, and ATP measurements","pmids":["29929962"],"confidence":"High","gaps":["Whether mitochondrial dysfunction is a direct consequence of tRNA hypomodification or an indirect effect is not established","Generalizability of the mitochondrial mechanism to other neuron types in FD is untested"]},{"year":2018,"claim":"The trans-acting splicing regulatory landscape of IKBKAP exon 20 was defined: hnRNP A1 was identified as a negative regulator binding intronic silencer elements, and antisense oligonucleotides targeting these regulatory regions fully restored exon 20 splicing in patient cells and FD mouse CNS.","evidence":"RNA binding assays, site-directed mutagenesis, hnRNP A1 knockdown in FD fibroblasts; two-step ASO screen with in vivo administration in FD transgenic mice","pmids":["29762696","29672717"],"confidence":"High","gaps":["Long-term therapeutic efficacy and safety of ASOs in FD patients was not assessed","Whether hnRNP A1 contributes to tissue-specific splicing variation was not determined"]},{"year":2021,"claim":"The positive splicing regulator SRSF6 and its upstream CLK kinases were identified as the mechanistic targets through which exon 20 inclusion can be pharmacologically enhanced, completing a bidirectional model of exon 20 splicing regulation.","evidence":"SRSF6 knockdown, direct RECTAS-CLK binding assay, SRSF6 phosphorylation assay, minigene and patient-derived cell line validation","pmids":["34301951"],"confidence":"High","gaps":["Whether CLK-SRSF6 activity differs across tissues and explains tissue-specific splicing ratios is not known","Therapeutic window for CLK modulation in patients is undefined"]},{"year":null,"claim":"Key unresolved questions include how ELP1 loss mechanistically activates p53 in neuronal progenitors, whether the cytoskeletal and mitochondrial defects are primary consequences of tRNA hypomodification or represent independent functions, and what determines the cell-type-selective vulnerability to ELP1 deficiency across different neuronal populations.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of the full mammalian Elongator complex with tRNA substrate","Causal hierarchy among tRNA modification, translational fidelity, cytoskeletal, and mitochondrial phenotypes is unresolved","Molecular basis of cell-type-specific vulnerability (e.g., TrkA+ vs TrkC+ neurons) is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[14]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,6]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[5,12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,14]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[5,7,12,13]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[11,14,15]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[6,8]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[10,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,9,10,12,16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,3,4,18,19,20]}],"complexes":["Elongator complex"],"partners":["FLNA","ELP3","KTI12","HRR25","HNRNPA1","SRSF6","SRSF3"],"other_free_text":[]},"mechanistic_narrative":"ELP1 (IKAP) is the largest scaffolding subunit of the Elongator complex, with dual roles in tRNA wobble-uridine modification and transcriptional elongation-coupled histone acetylation, and additional functions in cytoskeletal organization, axonal transport, and neuronal survival. Its C-terminal basic region directly binds tRNA substrates, and phosphorylation of adjacent serine residues by casein kinase I (Hrr25 in yeast) positively regulates Elongator's tRNA modification activity [PMID:24750273, PMID:25569479]. In the nervous system, ELP1 loss disrupts microtubule dynamics, target tissue innervation, mitochondrial complex I function, and cilia formation, leading to p53/caspase-3-dependent apoptosis of specific neuronal populations including TrkA+ sensory and sympathetic neurons and retinal ganglion cells [PMID:24173031, PMID:29929962, PMID:28167615, PMID:24917501]. A T→C splice-site mutation in IKBKAP intron 20 causes tissue-specific exon 20 skipping—most severe in the nervous system—producing truncated, non-functional protein and causing familial dysautonomia, with exon 20 inclusion governed by opposing activities of SRSF6 (enhanced by CLK-mediated phosphorylation) and inhibitory splicing factors hnRNP A1 and SRSF3 [PMID:11179008, PMID:12577200, PMID:29762696, PMID:34301951]."},"prefetch_data":{"uniprot":{"accession":"O95163","full_name":"Elongator complex protein 1","aliases":["IkappaB kinase complex-associated protein","IKK complex-associated protein","p150"],"length_aa":1332,"mass_kda":150.3,"function":"Component of the elongator complex which is required for multiple tRNA modifications, including mcm5U (5-methoxycarbonylmethyl uridine), mcm5s2U (5-methoxycarbonylmethyl-2-thiouridine), and ncm5U (5-carbamoylmethyl uridine) (PubMed:29332244). The elongator complex catalyzes the formation of carboxymethyluridine in the wobble base at position 34 in tRNAs (PubMed:29332244). Regulates the migration and branching of projection neurons in the developing cerebral cortex, through a process depending on alpha-tubulin acetylation (By similarity). ELP1 binds to tRNA, mediating interaction of the elongator complex with tRNA (By similarity). May act as a scaffold protein that assembles active IKK-MAP3K14 complexes (IKKA, IKKB and MAP3K14/NIK) (PubMed:9751059)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/O95163/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/ELP1","classification":"Common Essential","n_dependent_lines":1132,"n_total_lines":1208,"dependency_fraction":0.9370860927152318},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"FKBP5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ELP1","total_profiled":1310},"omim":[{"mim_id":"615020","title":"ELONGATOR ACETYLTRANSFERASE COMPLEX, SUBUNIT 6; ELP6","url":"https://www.omim.org/entry/615020"},{"mim_id":"615019","title":"ELONGATOR ACETYLTRANSFERASE COMPLEX, SUBUNIT 5; ELP5","url":"https://www.omim.org/entry/615019"},{"mim_id":"612722","title":"ELONGATOR ACETYLTRANSFERASE COMPLEX, SUBUNIT 3; ELP3","url":"https://www.omim.org/entry/612722"},{"mim_id":"609024","title":"KDEL ENDOPLASMIC RETICULUM PROTEIN RETENTION RECEPTOR 2; KDELR2","url":"https://www.omim.org/entry/609024"},{"mim_id":"603722","title":"ELONGATOR COMPLEX PROTEIN 1; ELP1","url":"https://www.omim.org/entry/603722"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ELP1"},"hgnc":{"alias_symbol":["IKAP","TOT1","IKI3"],"prev_symbol":["DYS","IKBKAP"]},"alphafold":{"accession":"O95163","domains":[{"cath_id":"-","chopping":"750-802_815-1007","consensus_level":"medium","plddt":87.8063,"start":750,"end":1007},{"cath_id":"2.40.128","chopping":"378-594","consensus_level":"medium","plddt":85.3764,"start":378,"end":594}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95163","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95163-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95163-F1-predicted_aligned_error_v6.png","plddt_mean":83.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELP1","jax_strain_url":"https://www.jax.org/strain/search?query=ELP1"},"sequence":{"accession":"O95163","fasta_url":"https://rest.uniprot.org/uniprotkb/O95163.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95163/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95163"}},"corpus_meta":[{"pmid":"11179008","id":"PMC_11179008","title":"Tissue-specific expression of a splicing mutation in the IKBKAP gene causes familial dysautonomia.","date":"2001","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11179008","citation_count":467,"is_preprint":false},{"pmid":"11179021","id":"PMC_11179021","title":"Familial dysautonomia is caused by mutations of the IKAP gene.","date":"2001","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11179021","citation_count":344,"is_preprint":false},{"pmid":"31130874","id":"PMC_31130874","title":"Mitochondrial (Dys)function and Insulin Resistance: From Pathophysiological Molecular Mechanisms to the Impact of Diet.","date":"2019","source":"Frontiers in physiology","url":"https://pubmed.ncbi.nlm.nih.gov/31130874","citation_count":253,"is_preprint":false},{"pmid":"9751059","id":"PMC_9751059","title":"IKAP is a scaffold protein of the IkappaB kinase complex.","date":"1998","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/9751059","citation_count":243,"is_preprint":false},{"pmid":"19700756","id":"PMC_19700756","title":"Mitochondrial (dys)function in adipocyte (de)differentiation and systemic metabolic alterations.","date":"2009","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/19700756","citation_count":205,"is_preprint":false},{"pmid":"23159879","id":"PMC_23159879","title":"Large-scale screening using familial dysautonomia induced pluripotent stem cells identifies compounds that rescue IKBKAP expression.","date":"2012","source":"Nature biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/23159879","citation_count":177,"is_preprint":false},{"pmid":"15920648","id":"PMC_15920648","title":"Auditory neuropathy/dys-synchrony and its perceptual consequences.","date":"2005","source":"Trends in amplification","url":"https://pubmed.ncbi.nlm.nih.gov/15920648","citation_count":164,"is_preprint":false},{"pmid":"25293493","id":"PMC_25293493","title":"Sex differences in mitochondrial (dys)function: Implications for neuroprotection.","date":"2014","source":"Journal of bioenergetics and biomembranes","url":"https://pubmed.ncbi.nlm.nih.gov/25293493","citation_count":159,"is_preprint":false},{"pmid":"1316805","id":"PMC_1316805","title":"A brefeldin A-like phenotype is induced by the overexpression of a human ERD-2-like protein, ELP-1.","date":"1992","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/1316805","citation_count":144,"is_preprint":false},{"pmid":"23950574","id":"PMC_23950574","title":"Rho-kinase: regulation, (dys)function, and inhibition.","date":"2013","source":"Biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23950574","citation_count":143,"is_preprint":false},{"pmid":"12577200","id":"PMC_12577200","title":"Tissue-specific reduction in splicing efficiency of IKBKAP due to the major mutation associated with familial dysautonomia.","date":"2003","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12577200","citation_count":117,"is_preprint":false},{"pmid":"20645984","id":"PMC_20645984","title":"Sodium channel (dys)function and cardiac arrhythmias.","date":"2010","source":"Cardiovascular therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/20645984","citation_count":112,"is_preprint":false},{"pmid":"19015235","id":"PMC_19015235","title":"Loss of mouse Ikbkap, a subunit of elongator, leads to transcriptional deficits and embryonic lethality that can be rescued by human IKBKAP.","date":"2008","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/19015235","citation_count":105,"is_preprint":false},{"pmid":"26627535","id":"PMC_26627535","title":"MicroRNAs and Endothelial (Dys) Function.","date":"2015","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/26627535","citation_count":104,"is_preprint":false},{"pmid":"21928343","id":"PMC_21928343","title":"Crosstalk between mitochondrial (dys)function and mitochondrial abundance.","date":"2012","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/21928343","citation_count":104,"is_preprint":false},{"pmid":"25721311","id":"PMC_25721311","title":"The facts about sexual (Dys)function in schizophrenia: an overview of clinically relevant findings.","date":"2015","source":"Schizophrenia bulletin","url":"https://pubmed.ncbi.nlm.nih.gov/25721311","citation_count":101,"is_preprint":false},{"pmid":"26392257","id":"PMC_26392257","title":"Cholestatic liver (dys)function during sepsis and other critical illnesses.","date":"2015","source":"Intensive care medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26392257","citation_count":99,"is_preprint":false},{"pmid":"9933302","id":"PMC_9933302","title":"Mutations in the Caenorhabditis elegans dystrophin-like gene dys-1 lead to hyperactivity and suggest a link with cholinergic transmission.","date":"1998","source":"Neurogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/9933302","citation_count":99,"is_preprint":false},{"pmid":"10893415","id":"PMC_10893415","title":"The I kappa B kinase (IKK) complex is tripartite and contains IKK gamma but not IKAP as a regular component.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10893415","citation_count":98,"is_preprint":false},{"pmid":"18303054","id":"PMC_18303054","title":"IKAP localizes to membrane ruffles with filamin A and regulates actin cytoskeleton organization and cell migration.","date":"2008","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/18303054","citation_count":91,"is_preprint":false},{"pmid":"14648814","id":"PMC_14648814","title":"Auditory neuropathy/dys-synchrony: diagnosis and management.","date":"2003","source":"Mental retardation and developmental disabilities research reviews","url":"https://pubmed.ncbi.nlm.nih.gov/14648814","citation_count":84,"is_preprint":false},{"pmid":"21775922","id":"PMC_21775922","title":"Kinetin improves IKBKAP mRNA splicing in patients with familial dysautonomia.","date":"2011","source":"Pediatric research","url":"https://pubmed.ncbi.nlm.nih.gov/21775922","citation_count":81,"is_preprint":false},{"pmid":"31665287","id":"PMC_31665287","title":"Human sperm ion channel (dys)function: implications for fertilization.","date":"2019","source":"Human reproduction update","url":"https://pubmed.ncbi.nlm.nih.gov/31665287","citation_count":79,"is_preprint":false},{"pmid":"20721304","id":"PMC_20721304","title":"Emotion (Dys)regulation and Links to Depressive Disorders.","date":"2008","source":"Child development perspectives","url":"https://pubmed.ncbi.nlm.nih.gov/20721304","citation_count":78,"is_preprint":false},{"pmid":"25930943","id":"PMC_25930943","title":"The (dys)functional extracellular matrix.","date":"2015","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/25930943","citation_count":75,"is_preprint":false},{"pmid":"15475579","id":"PMC_15475579","title":"HERG channel (dys)function revealed by dynamic action potential clamp technique.","date":"2004","source":"Biophysical journal","url":"https://pubmed.ncbi.nlm.nih.gov/15475579","citation_count":72,"is_preprint":false},{"pmid":"14521957","id":"PMC_14521957","title":"EGCG corrects aberrant splicing of IKAP mRNA in cells from patients with familial dysautonomia.","date":"2003","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/14521957","citation_count":70,"is_preprint":false},{"pmid":"19767293","id":"PMC_19767293","title":"The ubiquitin-proteasome pathway and endothelial (dys)function.","date":"2009","source":"Cardiovascular research","url":"https://pubmed.ncbi.nlm.nih.gov/19767293","citation_count":68,"is_preprint":false},{"pmid":"24917501","id":"PMC_24917501","title":"A neuron autonomous role for the familial dysautonomia gene ELP1 in sympathetic and sensory target tissue innervation.","date":"2014","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/24917501","citation_count":66,"is_preprint":false},{"pmid":"23882219","id":"PMC_23882219","title":"Using neurolipidomics to identify phospholipid mediators of synaptic (dys)function in Alzheimer's Disease.","date":"2013","source":"Frontiers in physiology","url":"https://pubmed.ncbi.nlm.nih.gov/23882219","citation_count":66,"is_preprint":false},{"pmid":"18783612","id":"PMC_18783612","title":"The Krüppel-like factor 9 (KLF9) network in HEC-1-A endometrial carcinoma cells suggests the carcinogenic potential of dys-regulated KLF9 expression.","date":"2008","source":"Reproductive biology and endocrinology : RB&E","url":"https://pubmed.ncbi.nlm.nih.gov/18783612","citation_count":64,"is_preprint":false},{"pmid":"24173031","id":"PMC_24173031","title":"Familial dysautonomia model reveals Ikbkap deletion causes apoptosis of Pax3+ progenitors and peripheral neurons.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/24173031","citation_count":61,"is_preprint":false},{"pmid":"12788105","id":"PMC_12788105","title":"Tocotrienols induce IKBKAP expression: a possible therapy for familial dysautonomia.","date":"2003","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/12788105","citation_count":59,"is_preprint":false},{"pmid":"19756484","id":"PMC_19756484","title":"Beta cell (dys)function in non-diabetic offspring of diabetic patients.","date":"2009","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/19756484","citation_count":58,"is_preprint":false},{"pmid":"28245910","id":"PMC_28245910","title":"Genomics of Islet (Dys)function and Type 2 Diabetes.","date":"2017","source":"Trends in genetics : TIG","url":"https://pubmed.ncbi.nlm.nih.gov/28245910","citation_count":58,"is_preprint":false},{"pmid":"26628587","id":"PMC_26628587","title":"IKAP: A heuristic framework for inference of kinase activities from Phosphoproteomics data.","date":"2015","source":"Bioinformatics (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/26628587","citation_count":58,"is_preprint":false},{"pmid":"29445253","id":"PMC_29445253","title":"Mitochondrial (Dys) Function in Inflammaging: Do MitomiRs Influence the Energetic, Oxidative, and Inflammatory Status of Senescent Cells?","date":"2017","source":"Mediators of inflammation","url":"https://pubmed.ncbi.nlm.nih.gov/29445253","citation_count":55,"is_preprint":false},{"pmid":"37115481","id":"PMC_37115481","title":"Neutrophil (dys)function due to altered immuno-metabolic axis in type 2 diabetes: implications in combating infections.","date":"2023","source":"Human cell","url":"https://pubmed.ncbi.nlm.nih.gov/37115481","citation_count":55,"is_preprint":false},{"pmid":"12381468","id":"PMC_12381468","title":"Superantigen-like gene(s) in human pathogenic Streptococcus dysgalactiae, subsp equisimilis: genomic localisation of the gene encoding streptococcal pyrogenic exotoxin G (speG(dys)).","date":"2002","source":"FEMS immunology and medical microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/12381468","citation_count":54,"is_preprint":false},{"pmid":"21273291","id":"PMC_21273291","title":"IKAP/Elp1 involvement in cytoskeleton regulation and implication for familial dysautonomia.","date":"2011","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21273291","citation_count":52,"is_preprint":false},{"pmid":"17644305","id":"PMC_17644305","title":"A humanized IKBKAP transgenic mouse models a tissue-specific human splicing defect.","date":"2007","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/17644305","citation_count":51,"is_preprint":false},{"pmid":"29672717","id":"PMC_29672717","title":"Antisense oligonucleotides correct the familial dysautonomia splicing defect in IKBKAP transgenic mice.","date":"2018","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/29672717","citation_count":51,"is_preprint":false},{"pmid":"16157902","id":"PMC_16157902","title":"Quantitative proton MRS of Pelizaeus-Merzbacher disease: evidence of dys- and hypomyelination.","date":"2005","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/16157902","citation_count":51,"is_preprint":false},{"pmid":"21802526","id":"PMC_21802526","title":"MicroRNAs and vascular (dys)function.","date":"2011","source":"Vascular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/21802526","citation_count":50,"is_preprint":false},{"pmid":"18634760","id":"PMC_18634760","title":"Uncovering genes for cognitive (dys)function and predisposition for alcoholism spectrum disorders: a review of human brain oscillations as effective endophenotypes.","date":"2008","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/18634760","citation_count":50,"is_preprint":false},{"pmid":"20045077","id":"PMC_20045077","title":"OPA1 (dys)functions.","date":"2010","source":"Seminars in cell & developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/20045077","citation_count":49,"is_preprint":false},{"pmid":"12116234","id":"PMC_12116234","title":"Familial dysautonomia: detection of the IKBKAP IVS20(+6T --> C) and R696P mutations and frequencies among Ashkenazi Jews.","date":"2002","source":"American journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12116234","citation_count":49,"is_preprint":false},{"pmid":"24119295","id":"PMC_24119295","title":"Differential recruitment of coregulators to the RORA promoter adds another layer of complexity to gene (dys) regulation by sex hormones in autism.","date":"2013","source":"Molecular autism","url":"https://pubmed.ncbi.nlm.nih.gov/24119295","citation_count":49,"is_preprint":false},{"pmid":"23717213","id":"PMC_23717213","title":"Ikbkap/Elp1 deficiency causes male infertility by disrupting meiotic progression.","date":"2013","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23717213","citation_count":47,"is_preprint":false},{"pmid":"17591626","id":"PMC_17591626","title":"IKAP/hELP1 deficiency in the cerebrum of familial dysautonomia patients results in down regulation of genes involved in oligodendrocyte differentiation and in myelination.","date":"2007","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17591626","citation_count":44,"is_preprint":false},{"pmid":"27101554","id":"PMC_27101554","title":"Histone acetylation in neuronal (dys)function.","date":"2016","source":"Biomolecular concepts","url":"https://pubmed.ncbi.nlm.nih.gov/27101554","citation_count":43,"is_preprint":false},{"pmid":"14552424","id":"PMC_14552424","title":"Patients with auditory neuropathy/dys-synchrony lack efferent suppression of transient evoked otoacoustic emissions.","date":"2003","source":"Journal of the American Academy of Audiology","url":"https://pubmed.ncbi.nlm.nih.gov/14552424","citation_count":42,"is_preprint":false},{"pmid":"16222667","id":"PMC_16222667","title":"Connexin 26 variants and auditory neuropathy/dys-synchrony among children in schools for the deaf.","date":"2005","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/16222667","citation_count":42,"is_preprint":false},{"pmid":"25569479","id":"PMC_25569479","title":"Phosphorylation of Elp1 by Hrr25 is required for elongator-dependent tRNA modification in yeast.","date":"2015","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25569479","citation_count":41,"is_preprint":false},{"pmid":"16964593","id":"PMC_16964593","title":"Weak definition of IKBKAP exon 20 leads to aberrant splicing in familial dysautonomia.","date":"2007","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/16964593","citation_count":41,"is_preprint":false},{"pmid":"21209961","id":"PMC_21209961","title":"Phosphatidylserine increases IKBKAP levels in familial dysautonomia cells.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21209961","citation_count":39,"is_preprint":false},{"pmid":"30905397","id":"PMC_30905397","title":"ELP1 Splicing Correction Reverses Proprioceptive Sensory Loss in Familial Dysautonomia.","date":"2019","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30905397","citation_count":39,"is_preprint":false},{"pmid":"26080306","id":"PMC_26080306","title":"Liver Disease and Hemostatic (Dys)function.","date":"2015","source":"Seminars in thrombosis and hemostasis","url":"https://pubmed.ncbi.nlm.nih.gov/26080306","citation_count":38,"is_preprint":false},{"pmid":"22792160","id":"PMC_22792160","title":"The CXCR3(+)CD56Bright phenotype characterizes a distinct NK cell subset with anti-fibrotic potential that shows dys-regulated activity in hepatitis C.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22792160","citation_count":38,"is_preprint":false},{"pmid":"22384137","id":"PMC_22384137","title":"IKAP/Elp1 is required in vivo for neurogenesis and neuronal survival, but not for neural crest migration.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22384137","citation_count":37,"is_preprint":false},{"pmid":"25409162","id":"PMC_25409162","title":"Involvement of IKAP in peripheral target innervation and in specific JNK and NGF signaling in developing PNS neurons.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25409162","citation_count":36,"is_preprint":false},{"pmid":"24180393","id":"PMC_24180393","title":"Transcriptional dys-regulation in anxiety and major depression: 5-HT1A gene promoter architecture as a therapeutic opportunity.","date":"2014","source":"Current pharmaceutical design","url":"https://pubmed.ncbi.nlm.nih.gov/24180393","citation_count":36,"is_preprint":false},{"pmid":"22046433","id":"PMC_22046433","title":"Deletion of exon 20 of the Familial Dysautonomia gene Ikbkap in mice causes developmental delay, cardiovascular defects, and early embryonic lethality.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22046433","citation_count":36,"is_preprint":false},{"pmid":"16969684","id":"PMC_16969684","title":"Frameshift mutation in GJA12 leading to nystagmus, spastic ataxia and CNS dys-/demyelination.","date":"2006","source":"Neurogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/16969684","citation_count":36,"is_preprint":false},{"pmid":"22968481","id":"PMC_22968481","title":"Exon 45 skipping through U1-snRNA antisense molecules recovers the Dys-nNOS pathway and muscle differentiation in human DMD myoblasts.","date":"2012","source":"Molecular therapy : the journal of the American Society of Gene Therapy","url":"https://pubmed.ncbi.nlm.nih.gov/22968481","citation_count":36,"is_preprint":false},{"pmid":"34301951","id":"PMC_34301951","title":"Therapeutic manipulation of IKBKAP mis-splicing with a small molecule to cure familial dysautonomia.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34301951","citation_count":36,"is_preprint":false},{"pmid":"23292167","id":"PMC_23292167","title":"Late sodium current inhibition in acquired and inherited ventricular (dys)function and arrhythmias.","date":"2013","source":"Cardiovascular drugs and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/23292167","citation_count":35,"is_preprint":false},{"pmid":"25064045","id":"PMC_25064045","title":"Genetic dys-regulation of astrocytic glutamate transporter EAAT2 and its implications in neurological disorders and manganese toxicity.","date":"2014","source":"Neurochemical research","url":"https://pubmed.ncbi.nlm.nih.gov/25064045","citation_count":34,"is_preprint":false},{"pmid":"24412346","id":"PMC_24412346","title":"Mitochondria: mitochondrial OXPHOS (dys) function ex vivo--the use of primary fibroblasts.","date":"2014","source":"The international journal of biochemistry & cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/24412346","citation_count":34,"is_preprint":false},{"pmid":"28167615","id":"PMC_28167615","title":"The familial dysautonomia disease gene IKBKAP is required in the developing and adult mouse central nervous system.","date":"2017","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/28167615","citation_count":33,"is_preprint":false},{"pmid":"23515154","id":"PMC_23515154","title":"Phosphatidylserine increases IKBKAP levels in a humanized knock-in IKBKAP mouse model.","date":"2013","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23515154","citation_count":31,"is_preprint":false},{"pmid":"23231394","id":"PMC_23231394","title":"Recent developments in the regulation of monoamine oxidase form and function: is the current model restricting our understanding of the breadth of contribution of monoamine oxidase to brain [dys]function?","date":"2012","source":"Current topics in medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23231394","citation_count":31,"is_preprint":false},{"pmid":"28702328","id":"PMC_28702328","title":"ASK1 (MAP3K5) is transcriptionally upregulated by E2F1 in adipose tissue in obesity, molecularly defining a human dys-metabolic obese phenotype.","date":"2017","source":"Molecular metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/28702328","citation_count":31,"is_preprint":false},{"pmid":"35259207","id":"PMC_35259207","title":"Structural (dys)connectivity associates with cholinergic cell density in Alzheimer's disease.","date":"2022","source":"Brain : a journal of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/35259207","citation_count":28,"is_preprint":false},{"pmid":"27699209","id":"PMC_27699209","title":"Loss of Ikbkap Causes Slow, Progressive Retinal Degeneration in a Mouse Model of Familial Dysautonomia.","date":"2016","source":"eNeuro","url":"https://pubmed.ncbi.nlm.nih.gov/27699209","citation_count":28,"is_preprint":false},{"pmid":"23298226","id":"PMC_23298226","title":"Mitochondrial (dys)function and regulation of macrophage cholesterol efflux.","date":"2013","source":"Clinical science (London, England : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/23298226","citation_count":27,"is_preprint":false},{"pmid":"16820583","id":"PMC_16820583","title":"Pacing-induced dys-synchrony preconditions rabbit myocardium against ischemia/reperfusion injury.","date":"2006","source":"Circulation","url":"https://pubmed.ncbi.nlm.nih.gov/16820583","citation_count":26,"is_preprint":false},{"pmid":"23887649","id":"PMC_23887649","title":"S-glutathionylation in monocyte and macrophage (dys)function.","date":"2013","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/23887649","citation_count":25,"is_preprint":false},{"pmid":"16125677","id":"PMC_16125677","title":"Tocotrienols reverse IKAP and monoamine oxidase deficiencies in familial dysautonomia.","date":"2005","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/16125677","citation_count":25,"is_preprint":false},{"pmid":"10606735","id":"PMC_10606735","title":"Mutations in the dystrophin-like dys-1 gene of Caenorhabditis elegans result in reduced acetylcholinesterase activity.","date":"1999","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/10606735","citation_count":25,"is_preprint":false},{"pmid":"11747609","id":"PMC_11747609","title":"Cloning, characterization, and genomic structure of the mouse Ikbkap gene.","date":"2001","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/11747609","citation_count":24,"is_preprint":false},{"pmid":"19014691","id":"PMC_19014691","title":"The C. elegans EMAP-like protein, ELP-1 is required for touch sensation and associates with microtubules and adhesion complexes.","date":"2008","source":"BMC developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/19014691","citation_count":24,"is_preprint":false},{"pmid":"29929962","id":"PMC_29929962","title":"Retina-specific loss of Ikbkap/Elp1 causes mitochondrial dysfunction that leads to selective retinal ganglion cell degeneration in a mouse model of familial dysautonomia.","date":"2018","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/29929962","citation_count":22,"is_preprint":false},{"pmid":"12914982","id":"PMC_12914982","title":"Of splice and men: what does the distribution of IKAP mRNA in the rat tell us about the pathogenesis of familial dysautonomia?","date":"2003","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/12914982","citation_count":22,"is_preprint":false},{"pmid":"29681800","id":"PMC_29681800","title":"Early Retinal Defects in Fmr1-/y Mice: Toward a Critical Role of Visual Dys-Sensitivity in the Fragile X Syndrome Phenotype?","date":"2018","source":"Frontiers in cellular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/29681800","citation_count":22,"is_preprint":false},{"pmid":"26437462","id":"PMC_26437462","title":"Familial Dysautonomia (FD) Human Embryonic Stem Cell Derived PNS Neurons Reveal that Synaptic Vesicular and Neuronal Transport Genes Are Directly or Indirectly Affected by IKBKAP Downregulation.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26437462","citation_count":22,"is_preprint":false},{"pmid":"16325550","id":"PMC_16325550","title":"Lack of mitogenic activity of speG- and speG(dys)-positive Streptococcus dysgalactiae subspecies equisimilis isolates from patients with invasive infections.","date":"2005","source":"International journal of medical microbiology : IJMM","url":"https://pubmed.ncbi.nlm.nih.gov/16325550","citation_count":22,"is_preprint":false},{"pmid":"35330152","id":"PMC_35330152","title":"From the Structural and (Dys)Function of ATP Synthase to Deficiency in Age-Related Diseases.","date":"2022","source":"Life (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/35330152","citation_count":21,"is_preprint":false},{"pmid":"9145530","id":"PMC_9145530","title":"Characterization of IKI1 and IKI3 genes conferring pGKL killer sensitivity on Saccharomyces cerevisiae.","date":"1997","source":"Bioscience, biotechnology, and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9145530","citation_count":21,"is_preprint":false},{"pmid":"30085848","id":"PMC_30085848","title":"Development of a Screening Platform to Identify Small Molecules That Modify ELP1 Pre-mRNA Splicing in Familial Dysautonomia.","date":"2018","source":"SLAS discovery : advancing life sciences R & D","url":"https://pubmed.ncbi.nlm.nih.gov/30085848","citation_count":21,"is_preprint":false},{"pmid":"23711097","id":"PMC_23711097","title":"Cardiac glycosides correct aberrant splicing of IKBKAP-encoded mRNA in familial dysautonomia derived cells by suppressing expression of SRSF3.","date":"2013","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/23711097","citation_count":20,"is_preprint":false},{"pmid":"24750273","id":"PMC_24750273","title":"A conserved and essential basic region mediates tRNA binding to the Elp1 subunit of the Saccharomyces cerevisiae Elongator complex.","date":"2014","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/24750273","citation_count":20,"is_preprint":false},{"pmid":"26006300","id":"PMC_26006300","title":"Molecular characterization of 7 patients affected by dys- or hypo-dysfibrinogenemia: Identification of a novel mutation in the fibrinogen Bbeta chain causing a gain of glycosylation.","date":"2015","source":"Thrombosis research","url":"https://pubmed.ncbi.nlm.nih.gov/26006300","citation_count":19,"is_preprint":false},{"pmid":"19585521","id":"PMC_19585521","title":"Dys-regulated activation of a Src tyroine kinase Hck at the Golgi disturbs N-glycosylation of a cytokine receptor Fms.","date":"2009","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/19585521","citation_count":19,"is_preprint":false},{"pmid":"21375541","id":"PMC_21375541","title":"Sickle cell, habitual dys-positions and fragile dispositions: young people with sickle cell at school.","date":"2011","source":"Sociology of health & illness","url":"https://pubmed.ncbi.nlm.nih.gov/21375541","citation_count":19,"is_preprint":false},{"pmid":"19262150","id":"PMC_19262150","title":"Loss-of-function of IKAP/ELP1: could neuronal migration defect underlie familial dysautonomia?","date":"2008","source":"Cell adhesion & migration","url":"https://pubmed.ncbi.nlm.nih.gov/19262150","citation_count":18,"is_preprint":false},{"pmid":"24942185","id":"PMC_24942185","title":"Astragalus membranaceus up-regulate Cosmc expression and reverse IgA dys-glycosylation in IgA nephropathy.","date":"2014","source":"BMC complementary and alternative medicine","url":"https://pubmed.ncbi.nlm.nih.gov/24942185","citation_count":18,"is_preprint":false},{"pmid":"36170956","id":"PMC_36170956","title":"Redox stress and metal dys-homeostasis appear as hallmarks of early prion disease pathogenesis in mice.","date":"2022","source":"Free radical biology & medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36170956","citation_count":17,"is_preprint":false},{"pmid":"27483351","id":"PMC_27483351","title":"MicroRNA screening identifies a link between NOVA1 expression and a low level of IKAP in familial dysautonomia.","date":"2016","source":"Disease models & mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/27483351","citation_count":17,"is_preprint":false},{"pmid":"29762696","id":"PMC_29762696","title":"Blocking of an intronic splicing silencer completely rescues IKBKAP exon 20 splicing in familial dysautonomia patient cells.","date":"2018","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/29762696","citation_count":17,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46109,"output_tokens":5598,"usd":0.111148},"stage2":{"model":"claude-opus-4-6","input_tokens":9230,"output_tokens":3562,"usd":0.2028},"total_usd":0.313948,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"IKAP (ELP1) was identified as a scaffold protein of the IκB kinase complex, capable of binding NIK, IKK-α, and IKK-β and assembling them into an active kinase complex, as demonstrated by isolation of large IL-1-inducible IKK complexes containing NIK, IKK-α, IKK-β, IκB-α, NF-κB/RelA, and IKAP.\",\n      \"method\": \"Biochemical co-purification and complex isolation from IL-1-stimulated cells; protein identification by mass spectrometry\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-purification with multiple binding partners; single lab but multiple components identified\",\n      \"pmids\": [\"9751059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"IKAP is not a stoichiometric component of the IKK complex and plays no specific role in cytokine-induced NF-κB activation; IKKγ/NEMO was identified as the obligatory scaffold subunit. Antisense-mediated reduction of IKAP had no effect on IKK activity or NF-κB signaling, whereas IKKγ reduction did.\",\n      \"method\": \"Quantitative co-immunoprecipitation, antisense oligonucleotide knockdown, NF-κB reporter assay, in vitro reconstitution of IKK complex with IKKα/β/γ only\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution of IKK complex without IKAP plus functional knockdown; orthogonal methods in single rigorous study\",\n      \"pmids\": [\"10893415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The major FD-causing mutation is a T→C transition at the donor splice site of intron 20 of IKBKAP, resulting in tissue-specific skipping of exon 20 and production of a truncated, non-functional IKAP protein; a minor missense mutation R696P in exon 19 disrupts a consensus serine/threonine kinase phosphorylation site and causes defective phosphorylation of IKAP.\",\n      \"method\": \"Genomic sequencing, RT-PCR, tissue-specific RNA analysis from lymphoblasts and brain, protein analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independently replicated by two simultaneous publications using sequencing plus functional RNA/protein analysis\",\n      \"pmids\": [\"11179008\", \"11179021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Tissue-specific reduction in wild-type IKBKAP splicing efficiency underlies the selective neuronal degeneration in FD; WT:mutant IKBKAP transcript ratios are highest in lymphoblasts and lowest in postmortem central and peripheral nervous tissues, with corresponding reduction in WT IKAP protein.\",\n      \"method\": \"Densitometry and real-time quantitative PCR on RNA from lymphoblasts, fibroblasts, blood, and postmortem tissues; immunoblotting for protein\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple tissue types, two quantitative methods, strong mechanistic link between splicing ratio and neuropathology\",\n      \"pmids\": [\"12577200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Weak intrinsic splicing signals flanking IKBKAP exon 20 (weak 3' splice site and weak exonic sequences) underlie the FD splicing defect; the position-6 mutation in the 5' splice site causes exon skipping only in the context of these pre-existing weak signals, as validated by in vitro coupled RNAPII transcription/splicing assay and minigene transfection.\",\n      \"method\": \"Computational splice-site analysis, in vitro RNAPII-coupled transcription/splicing assay, minigene transfection assays\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro reconstitution assay combined with in vivo minigene validation; orthogonal methods\",\n      \"pmids\": [\"16964593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"IKAP (ELP1) localizes to membrane ruffles where it co-localizes with filamin A; RNAi-mediated depletion of IKAP causes defective cell adhesion, migration, and actin cytoskeleton organization in multiple cell types including primary neurons, effects rescued by wild-type IKAP but not by the FD-truncated form.\",\n      \"method\": \"RNAi knockdown, immunostaining, co-purification with filamin A, rescue experiments with wild-type vs. FD-IKAP, migration assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-purification, multiple cell types, rescue with wild-type vs. mutant protein, localization with functional consequence\",\n      \"pmids\": [\"18303054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Loss of Ikbkap in mouse embryos causes embryonic lethality by E12.5 with defects in vascular and neural development; Ikbkap-null embryos show downregulation of genes important for neurulation and vascular development correlated with a defect in transcriptional elongation-coupled histone acetylation.\",\n      \"method\": \"Conditional knockout mouse, morphological analysis, microarray/gene expression analysis, histone acetylation assay, rescue with human IKBKAP transgene\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific phenotypic readouts plus mechanistic biochemical assay (histone acetylation) and transgenic rescue\",\n      \"pmids\": [\"19015235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"IKAP/Elp1 deficiency causes disorganization of microtubules and aberrant cell shape; SCG10 (STMN2), a microtubule-destabilizing protein, is upregulated in IKAP-deficient cells, and REST (a repressor of SCG10) is downregulated in IKAP-deficient neuroblastoma cells and FD cerebrum, providing a mechanistic link between IKAP deficiency and cytoskeletal destabilization.\",\n      \"method\": \"Immunostaining of α-tubulin in IKAP knockdown cell lines and FD tissues, western blot and RT-PCR for SCG10 and REST in FD cerebrum and fibroblasts\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, immunostaining and expression analysis, mechanistic pathway inferred but not directly reconstituted\",\n      \"pmids\": [\"21273291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Deletion of exon 20 of Ikbkap abolishes gene function, causing developmental delay, cardiovascular defects, and early embryonic lethality; IKAP is essential for expression of specific genes involved in cardiac morphogenesis, and the FD-truncated protein lacks significant biological function.\",\n      \"method\": \"Homologous recombination to generate exon-20 deletion allele in mice, embryological analysis, gene expression profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with allele-specific phenotype; genetic proof that exon 20 deletion abolishes function\",\n      \"pmids\": [\"22046433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IKAP/Elp1 is not required for neural crest cell migration but is essential for post-migratory neuronal differentiation and survival; gain- and loss-of-function studies in chick embryos show IKAP is expressed as neurons differentiate and that altered IKAP levels perturb neuronal polarity, differentiation, and survival.\",\n      \"method\": \"RNAi knockdown in neural crest lineage in ovo, gain-of-function overexpression, reporter gene analysis, immunostaining for IKAP expression pattern\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — both gain and loss of function in vivo with specific cellular phenotypes; expression pattern defines mechanism\",\n      \"pmids\": [\"22384137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ikbkap is essential for the second wave of neurogenesis producing TrkA+ nociceptors and thermoreceptors; in its absence, Pax3+ progenitors undergo p53-mediated premature differentiation and death, and TrkA+ (but not TrkC+) sensory and sympathetic neurons undergo exacerbated caspase-3-mediated apoptosis independent of NGF levels.\",\n      \"method\": \"Conditional knockout (PNS-specific Ikbkap deletion), immunostaining, apoptosis assays (caspase-3), neuronal counting, genetic epistasis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with mechanistic identification of apoptotic pathway (p53, caspase-3) and cell-type specificity\",\n      \"pmids\": [\"24173031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ikbkap/Elp1 is essential for meiosis during spermatogenesis; absence causes defects in synapsis and meiotic recombination leading to apoptosis and complete gametogenesis arrest. Additionally, Ikbkap-mutant testes show defects in wobble uridine tRNA modification, confirming a conserved tRNA modification function from yeast to mammals.\",\n      \"method\": \"Conditional knockout mouse (spermatocyte-specific), cytological analysis of meiotic spread chromosomes, tRNA modification analysis, gene expression profiling\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific meiotic phenotype and direct biochemical measurement of tRNA modification\",\n      \"pmids\": [\"23717213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Elp1 (ELP1) loss in post-migratory sympathetic neurons causes failed target tissue innervation correlated with abnormal neurite outgrowth/branching and abnormal cellular distribution of soluble tyrosinated α-tubulin, indicating a role for Elp1 in cytoskeletal regulation required for innervation.\",\n      \"method\": \"Conditional knockout of Elp1 in neural crest progenitors and post-migratory sympathetic neurons, immunostaining for tyrosinated α-tubulin, neurite morphology analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KO with direct localization/morphology phenotype linked to cytoskeletal mechanism\",\n      \"pmids\": [\"24917501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"IKAP colocalizes with activated JNK (pJNK), dynein, and β-tubulin at axon terminals of DRG neurons, and is required for transport of specific target-derived signals for JNK and NGF responsive gene transcription in the nucleus.\",\n      \"method\": \"Immunostaining and colocalization analysis in chick DRG neurons; shRNA knockdown of IKAP followed by JNK signaling and gene expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — colocalization with functional knockdown; single lab, no direct reconstitution of transport complex\",\n      \"pmids\": [\"25409162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The C-terminal basic (arginine/lysine-rich) region of yeast Elp1 is essential for Elongator tRNA wobble uridine modification function by mediating a direct interaction between tRNA and the Elp1 C-terminal domain, rather than controlling nucleo-cytoplasmic distribution.\",\n      \"method\": \"Alanine substitution mutagenesis, tRNA modification assays, tRNA-binding assays with Elp1 C-terminal domain, subcellular fractionation\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with direct tRNA binding assay; establishes the molecular basis of tRNA interaction\",\n      \"pmids\": [\"24750273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The yeast casein kinase I Hrr25 directly phosphorylates Elp1 on Ser-1198 and Ser-1202 at its C-terminus adjacent to the tRNA-binding region; phosphorylation at these sites positively regulates Elongator's tRNA modification function and modulates interactions with accessory protein Kti12 and Hrr25 itself.\",\n      \"method\": \"In vivo phosphorylation site mapping (mass spectrometry), in vitro kinase assay with Hrr25, alanine and phosphomimetic substitutions at identified sites, tRNA modification functional assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay plus mutagenesis at specific sites validated by functional tRNA modification assay\",\n      \"pmids\": [\"25569479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ikbkap is required not only in the PNS but also in the CNS; conditional deletion in the nervous system disrupts cortical neuron development and survival, reduces primary cilia in embryonic cortical apical progenitors and motile cilia in adult ependymal cells, and causes progressive loss of spinal motor and cortical neurons.\",\n      \"method\": \"Nervous-system-specific conditional knockout mouse, immunostaining, neuron counting, cilia morphology analysis, behavioral assays\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional KO with multiple specific cellular phenotypes (cilia defects, neurodegeneration)\",\n      \"pmids\": [\"28167615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Loss of IKAP in retinal ganglion cells causes mitochondrial membrane depolarization, impaired complex I function, and reduced ATP, leading to selective RGC degeneration; other retinal neurons show mitochondrial impairment but do not degenerate, implicating RGC-specific mitochondrial vulnerability.\",\n      \"method\": \"Retina-specific conditional knockout (Pax6-Cre), mitochondrial membrane potential assay, complex I activity assay, ATP measurement, immunostaining, cell counting\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with direct biochemical measurement of mitochondrial function parameters linked to degeneration phenotype\",\n      \"pmids\": [\"29929962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"hnRNP A1 binds to an intronic splicing silencer downstream of the IKBKAP exon 20 5' splice site and to two inhibitory intronic splicing elements inside exon 20, acting as a negative regulator of exon 20 inclusion; knockdown of hnRNP A1 increases exon 20 inclusion in FD patient cells.\",\n      \"method\": \"RNA binding assays, site-directed mutagenesis of SREs in minigene, hnRNP A1 knockdown in FD patient fibroblasts, splice-switching oligonucleotides blocking hnRNP A1 binding site\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct binding assay, mutagenesis, knockdown with functional exon-inclusion readout; multiple orthogonal methods\",\n      \"pmids\": [\"29762696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Antisense oligonucleotides targeting intronic regions adjacent to IKBKAP exon 20 can fully restore exon 20 splicing in FD patient fibroblasts and increase full-length IKAP protein in multiple tissues including CNS of FD transgenic mice; cis-acting regulatory sequences controlling exon 20 recognition were characterized.\",\n      \"method\": \"Two-step ASO screen, minigene splicing assays, ASO administration in FD transgenic mice, RT-PCR and western blot for IKBKAP mRNA and IKAP protein in multiple tissues\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo ASO rescue with defined mechanistic target; multiple tissue validation\",\n      \"pmids\": [\"29672717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Exon 20 inclusion in IKBKAP is promoted by SRSF6 binding to an intronic splicing enhancer in intron 20; the small molecule RECTAS directly interacts with CDC-like kinases (CLKs) and enhances SRSF6 phosphorylation, thereby promoting exon 20 inclusion. Conversely, CLK inhibition reduces exon 20 splicing, and exon 20 splicing can be bidirectionally manipulated by targeting CLK activity.\",\n      \"method\": \"Knockdown of SRSF6 and other SR proteins, direct binding assay of RECTAS to CLKs, phosphorylation assays for SRSF6, minigene splicing assays, patient-derived cell lines and FD disease models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct drug-target binding, kinase phosphorylation assay, genetic knockdown with bidirectional functional readout; validated in multiple FD models\",\n      \"pmids\": [\"34301951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SKF-86466 (an alpha-2 adrenergic receptor antagonist) rescues IKBKAP expression in FD iPSC-derived neural crest precursors by inducing IKBKAP transcription through modulation of intracellular cAMP levels and PKA-dependent CREB phosphorylation, implicating the alpha-2 adrenergic receptor/cAMP/PKA/CREB pathway in regulating IKBKAP expression.\",\n      \"method\": \"iPSC-derived neural crest precursor screen of 6,912 compounds, cAMP measurement, PKA inhibitor experiments, CREB phosphorylation assay, IKAP protein rescue assay\",\n      \"journal\": \"Nature biotechnology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological and biochemical assays identifying pathway; large-scale screen with mechanistic follow-up\",\n      \"pmids\": [\"23159879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cardiac glycoside digoxin corrects FD-associated aberrant IKBKAP splicing by suppressing SRSF3 protein levels; SRSF3 binding site(s) in the intron 5' of exon 20 are required for this effect, identifying SRSF3 as a negative regulator of exon 20 inclusion.\",\n      \"method\": \"RT-PCR splicing assay, SRSF3 knockdown, cis-element mutagenesis, digoxin treatment in FD patient cells and neuronal cells\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — functional knockdown plus cis-element mutagenesis; single lab study\",\n      \"pmids\": [\"23711097\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ELP1 (IKAP) is the largest subunit of the Elongator complex with established roles in transcriptional elongation-coupled histone acetylation and tRNA wobble-uridine modification (the latter requiring direct tRNA binding via its C-terminal basic region and positive regulation by CLK-mediated phosphorylation of SRSF6); in neurons, ELP1 additionally regulates cytoskeletal organization (microtubule dynamics, filamin A interaction at membrane ruffles), axonal transport, and target tissue innervation, while its loss causes selective mitochondrial dysfunction and apoptosis of sensory/autonomic neurons—defects arising from a tissue-specific splicing mutation that reduces full-length ELP1 protein in the nervous system and underlies familial dysautonomia.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ELP1 (IKAP) is the largest scaffolding subunit of the Elongator complex, with dual roles in tRNA wobble-uridine modification and transcriptional elongation-coupled histone acetylation, and additional functions in cytoskeletal organization, axonal transport, and neuronal survival. Its C-terminal basic region directly binds tRNA substrates, and phosphorylation of adjacent serine residues by casein kinase I (Hrr25 in yeast) positively regulates Elongator's tRNA modification activity [PMID:24750273, PMID:25569479]. In the nervous system, ELP1 loss disrupts microtubule dynamics, target tissue innervation, mitochondrial complex I function, and cilia formation, leading to p53/caspase-3-dependent apoptosis of specific neuronal populations including TrkA+ sensory and sympathetic neurons and retinal ganglion cells [PMID:24173031, PMID:29929962, PMID:28167615, PMID:24917501]. A T→C splice-site mutation in IKBKAP intron 20 causes tissue-specific exon 20 skipping—most severe in the nervous system—producing truncated, non-functional protein and causing familial dysautonomia, with exon 20 inclusion governed by opposing activities of SRSF6 (enhanced by CLK-mediated phosphorylation) and inhibitory splicing factors hnRNP A1 and SRSF3 [PMID:11179008, PMID:12577200, PMID:29762696, PMID:34301951].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Initial identification of IKAP as a putative IκB kinase scaffold raised the question of whether ELP1 functions in NF-κB signaling, but this was definitively refuted when IKAP proved dispensable for IKK activity and NF-κB activation.\",\n      \"evidence\": \"Biochemical co-purification from IL-1-stimulated cells (1998) followed by quantitative co-IP, antisense knockdown, and in vitro reconstitution showing IKAP is not a stoichiometric IKK component (2000)\",\n      \"pmids\": [\"9751059\", \"10893415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The reason IKAP co-purified with the IKK complex in the original study has not been explained\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of the FD-causing splice-site mutation in IKBKAP intron 20 and the demonstration that tissue-specific exon 20 skipping is most severe in the nervous system established the molecular basis of familial dysautonomia and explained its selective neuronal pathology.\",\n      \"evidence\": \"Genomic sequencing and RT-PCR in patient lymphoblasts and brain tissues (2001), followed by quantitative tissue-specific splicing ratio analysis across multiple organs (2003)\",\n      \"pmids\": [\"11179008\", \"11179021\", \"12577200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The trans-acting factors responsible for tissue-specific splicing efficiency were not yet identified\", \"Why the nervous system has the lowest WT:mutant transcript ratio was not mechanistically explained\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Characterization of the weak intrinsic splicing signals flanking exon 20 explained why the position-6 splice-site mutation causes exon skipping specifically in this context, establishing a cis-regulatory framework for the FD splicing defect.\",\n      \"evidence\": \"Computational splice-site analysis combined with in vitro RNAPII-coupled transcription/splicing assay and minigene transfection\",\n      \"pmids\": [\"16964593\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of tissue-specific trans-acting splicing regulators was still unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that ELP1 localizes to membrane ruffles with filamin A and that its loss disrupts cell adhesion, migration, and actin organization established a direct cytoskeletal role beyond transcriptional functions.\",\n      \"evidence\": \"RNAi knockdown with rescue by wild-type but not FD-truncated IKAP in multiple cell types including primary neurons; co-purification with filamin A\",\n      \"pmids\": [\"18303054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cytoskeletal defects are direct or secondary to tRNA modification/translational defects was not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Knockout studies in mice proved ELP1 is essential for embryonic viability and linked its loss to defective transcriptional elongation-coupled histone acetylation, establishing the Elongator complex function as physiologically critical in mammals.\",\n      \"evidence\": \"Ikbkap-null and exon-20-deletion mice showing embryonic lethality with vascular/neural defects; histone acetylation assay and transgenic rescue\",\n      \"pmids\": [\"19015235\", \"22046433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of histone acetylation versus tRNA modification to the embryonic phenotype were not disentangled\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Cell-type-specific conditional knockouts revealed that ELP1 is essential for TrkA+ nociceptor neurogenesis and survival via suppression of p53-mediated premature differentiation and caspase-3-dependent apoptosis, explaining the selective sensory neuron loss in FD.\",\n      \"evidence\": \"PNS-specific Ikbkap conditional KO with caspase-3 immunostaining, neuronal subtype counting, and genetic epistasis\",\n      \"pmids\": [\"24173031\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ELP1 loss activates p53 was not determined\", \"Whether the apoptosis mechanism differs between sensory and sympathetic neurons was not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"A conserved tRNA wobble-uridine modification function was confirmed in mammals when Ikbkap-mutant testes showed tRNA modification defects alongside meiotic failure, and yeast studies mapped this activity to direct tRNA binding by the Elp1 C-terminal basic region.\",\n      \"evidence\": \"Spermatocyte-specific conditional KO with tRNA modification analysis (2013); alanine mutagenesis of Elp1 C-terminal domain with direct tRNA binding assay in yeast (2014)\",\n      \"pmids\": [\"23717213\", \"24750273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether tRNA modification defects directly cause the meiotic phenotype or act through downstream translational effects was not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"ELP1 was shown to regulate microtubule dynamics and axonal transport in neurons: its loss disrupts tyrosinated α-tubulin distribution and target innervation in sympathetic neurons, and it colocalizes with dynein and pJNK at axon terminals to facilitate retrograde signaling.\",\n      \"evidence\": \"Conditional KO of Elp1 in post-migratory sympathetic neurons with tubulin immunostaining; shRNA knockdown in chick DRG neurons with JNK signaling analysis\",\n      \"pmids\": [\"24917501\", \"25409162\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct reconstitution of an ELP1-dynein transport complex has not been achieved\", \"Whether cytoskeletal defects reflect tRNA-modification-dependent translational effects on tubulin-modifying enzymes is unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Phosphorylation of Elp1 by casein kinase I Hrr25 at C-terminal serines adjacent to the tRNA-binding region was shown to positively regulate Elongator tRNA modification activity, establishing a regulatory switch controlling Elongator function.\",\n      \"evidence\": \"In vitro kinase assay with Hrr25, mass-spectrometry-based phosphosite mapping, phosphomimetic/alanine substitutions with tRNA modification functional readout in yeast\",\n      \"pmids\": [\"25569479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the mammalian orthologous kinase CK1 performs the equivalent regulation has not been tested\", \"How phosphorylation mechanistically alters tRNA binding or catalysis is unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"CNS-specific ELP1 functions were uncovered: conditional deletion disrupts cortical neuron development, primary and motile cilia formation, and causes progressive motor and cortical neurodegeneration, broadening FD pathology beyond the PNS.\",\n      \"evidence\": \"Nervous-system-specific conditional KO mouse with cilia morphology analysis, neuron counting, and behavioral assays\",\n      \"pmids\": [\"28167615\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking ELP1 to ciliogenesis is unknown\", \"Whether cilia defects contribute to neurodegeneration or are parallel consequences is unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"ELP1 loss was linked to selective mitochondrial dysfunction: retinal ganglion cells lacking IKAP show mitochondrial membrane depolarization and impaired complex I activity, revealing a mitochondrial vulnerability mechanism for neurodegeneration.\",\n      \"evidence\": \"Retina-specific conditional KO with mitochondrial membrane potential, complex I activity, and ATP measurements\",\n      \"pmids\": [\"29929962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mitochondrial dysfunction is a direct consequence of tRNA hypomodification or an indirect effect is not established\", \"Generalizability of the mitochondrial mechanism to other neuron types in FD is untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The trans-acting splicing regulatory landscape of IKBKAP exon 20 was defined: hnRNP A1 was identified as a negative regulator binding intronic silencer elements, and antisense oligonucleotides targeting these regulatory regions fully restored exon 20 splicing in patient cells and FD mouse CNS.\",\n      \"evidence\": \"RNA binding assays, site-directed mutagenesis, hnRNP A1 knockdown in FD fibroblasts; two-step ASO screen with in vivo administration in FD transgenic mice\",\n      \"pmids\": [\"29762696\", \"29672717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term therapeutic efficacy and safety of ASOs in FD patients was not assessed\", \"Whether hnRNP A1 contributes to tissue-specific splicing variation was not determined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The positive splicing regulator SRSF6 and its upstream CLK kinases were identified as the mechanistic targets through which exon 20 inclusion can be pharmacologically enhanced, completing a bidirectional model of exon 20 splicing regulation.\",\n      \"evidence\": \"SRSF6 knockdown, direct RECTAS-CLK binding assay, SRSF6 phosphorylation assay, minigene and patient-derived cell line validation\",\n      \"pmids\": [\"34301951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CLK-SRSF6 activity differs across tissues and explains tissue-specific splicing ratios is not known\", \"Therapeutic window for CLK modulation in patients is undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how ELP1 loss mechanistically activates p53 in neuronal progenitors, whether the cytoskeletal and mitochondrial defects are primary consequences of tRNA hypomodification or represent independent functions, and what determines the cell-type-selective vulnerability to ELP1 deficiency across different neuronal populations.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of the full mammalian Elongator complex with tRNA substrate\", \"Causal hierarchy among tRNA modification, translational fidelity, cytoskeletal, and mitochondrial phenotypes is unresolved\", \"Molecular basis of cell-type-specific vulnerability (e.g., TrkA+ vs TrkC+ neurons) is unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [5, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 14]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [5, 7, 12, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [11, 14, 15]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 9, 10, 12, 16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 3, 4, 18, 19, 20]}\n    ],\n    \"complexes\": [\n      \"Elongator complex\"\n    ],\n    \"partners\": [\n      \"FLNA\",\n      \"ELP3\",\n      \"KTI12\",\n      \"HRR25\",\n      \"HNRNPA1\",\n      \"SRSF6\",\n      \"SRSF3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}