{"gene":"EYA1","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1999,"finding":"Eya1 knockout mice lack ears and kidneys due to defective inductive tissue interactions and abnormal apoptosis of organ primordia. In Eya1-/- embryos, Six1 (but not Pax) expression is Eya1-dependent, placing Eya1 upstream of Six1 in a Pax-Eya-Six regulatory hierarchy. Additionally, Gdnf expression is absent in Eya1-/- metanephric mesenchyme, placing Eya1 upstream of Gdnf in kidney development.","method":"Targeted gene inactivation in mice (loss-of-function), in situ hybridization for pathway marker expression","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular and molecular phenotypes, pathway placement confirmed by marker analysis; foundational paper replicated across subsequent studies","pmids":["10471511"],"is_preprint":false},{"year":2001,"finding":"BOR-associated missense mutations in the conserved Eya domain of EYA1 do not alter protein subcellular localization but disrupt protein-protein interactions (with Six proteins) in both yeast two-hybrid and mammalian co-immunoprecipitation assays, indicating that the Eya domain is required for complex formation.","method":"Yeast two-hybrid, co-immunoprecipitation in mammalian cells, immunofluorescence localization","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction assays in two systems (yeast and mammalian), single lab","pmids":["11734542"],"is_preprint":false},{"year":2002,"finding":"Eya1 is required for initiation of thymus, parathyroid, and thyroid morphogenesis. In Eya1-/- embryos, Six1 expression is markedly reduced in arch mesenchyme, pouch endoderm, and surface ectoderm of the pharyngeal region, confirming Eya1 acts upstream of Six1 in pharyngeal organogenesis. Gcm2 expression in 3rd pouch endoderm is lost in Eya1-/- embryos, while Hox and Pax gene expression is preserved, indicating selective pathway dependence.","method":"Targeted gene knockout in mice, in situ hybridization for pathway markers","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with specific molecular marker analysis defining pathway position; multiple organs analyzed","pmids":["12070080"],"is_preprint":false},{"year":2004,"finding":"SIX1 mutations causing BOR/BO syndrome disrupt EYA1-SIX1 protein-protein interaction, and homeodomain mutations additionally abolish SIX1-DNA binding, demonstrating that EYA1 functions through physical interaction with SIX1 to form a transcriptional complex required for organogenesis.","method":"Co-immunoprecipitation, yeast two-hybrid, electrophoretic mobility shift assay (protein-DNA interaction), direct sequencing of patient mutations","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, yeast two-hybrid, EMSA) with disease-causing mutations; replicated across multiple kindreds","pmids":["15141091"],"is_preprint":false},{"year":2004,"finding":"Eya1 and Six1 are necessary for normal maintenance of neurogenesis in vestibuloacoustic neurons and epibranchial placode-derived ganglia. In Eya1/Six1 mutants, epibranchial progenitor cells fail to express Neurog2 and other bHLH and Phox2 genes required for neuronal determination, resulting in apoptosis, placing Eya1 upstream of neurogenic determination factors.","method":"Genetic loss-of-function (Eya1-/- and Six1-/- mice), in situ hybridization for neurogenic markers","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO models with specific molecular marker analysis across multiple neuronal lineages","pmids":["15496442"],"is_preprint":false},{"year":2004,"finding":"Six1 and Eya1 proteins expressed together in slow-twitch soleus muscle drive fiber-type transition to fast-twitch glycolytic phenotype. Six1 and Eya1 proteins accumulate preferentially in nuclei of fast-twitch muscles and cooperatively activate MEF3/Six DNA-binding element-dependent transcription of fast-fiber genes.","method":"Forced transgenic co-expression in mouse skeletal muscle, reporter assays, immunolocalization, myosin heavy chain isoform analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo gain-of-function in adult muscle with multiple molecular readouts confirming transcriptional mechanism","pmids":["15226428"],"is_preprint":false},{"year":2004,"finding":"EYA1 Eya domain (EYA1HR) interacts with SIX1 in yeast two-hybrid assays. After co-expression with Six1, EYA1HR is translocated from cytoplasm to nucleus, demonstrating that Six1-mediated nuclear translocation is required for EYA1 transcriptional activity.","method":"Yeast two-hybrid, immunofluorescence co-localization, alpha-galactosidase reporter activity","journal":"Journal of the Association for Research in Otolaryngology : JARO","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (yeast two-hybrid + immunofluorescence), single lab","pmids":["15492887"],"is_preprint":false},{"year":2006,"finding":"Eya1 and Eya2 double knockout results in loss of Pax3 expression in ventrolateral dermomyotomes, preventing hypaxial lip formation and limb muscle progenitor delamination. Six proteins recruit Eya proteins to MEF3 DNA sites to drive transcription in dermomyotomal cells, establishing genetic epistasis: Six and Eya genes act upstream of Pax3 in hypaxial myogenic commitment.","method":"Compound Eya1/Eya2 double knockout mice, in situ hybridization, chromatin-based reporter assays, genetic epistasis analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound KO with defined molecular phenotype and pathway ordering via epistasis across multiple models","pmids":["17098221"],"is_preprint":false},{"year":2006,"finding":"In pharyngeal pouch development, Eya1 acts upstream of Tbx1, Fgf8, and Wnt5b expression in the pouch endoderm. Pax1 expression in pharyngeal pouches requires both Eya1 and Six1 function, while Eya1 and Six1 expression in the pouches does not require Pax1/Pax9 (i.e., Eya1 is not downstream of Pax1/Pax9 in this context).","method":"Genetic loss-of-function (Six1-/-, Six1/Six4 double mutant, Eya1-/- mice), in situ hybridization for pathway markers","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mutant combinations with specific marker analysis defining pathway hierarchy","pmids":["16530750"],"is_preprint":false},{"year":2006,"finding":"Eya1-/- otic epithelium shows reduced cell proliferation from E8.5 and increased apoptosis from E9.0. Genetic evidence shows Pax2 interacts with Eya1 during inner ear morphogenesis—compound Pax2/Eya1 mutants reveal synergistic defects in all sensory areas, indicating functional interaction critical for sensory development.","method":"Loss-of-function genetics (Eya1-/-, Pax2-/-, compound mutants), BrdU proliferation assay, TUNEL apoptosis assay, latex paint-filling of inner ear","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound genetic epistasis with cellular assays providing mechanistic basis for Eya1-Pax2 interaction in inner ear","pmids":["16916509"],"is_preprint":false},{"year":2008,"finding":"Eya1 and Six1 regulate placodal neurogenesis in Xenopus by expanding SoxB1 gene expression (Sox2, Sox3) at higher doses to maintain progenitor proliferation, and by promoting neuronal differentiation at lower doses, downstream of or parallel to Ngnr1.","method":"Loss-of-function (morpholino knockdown) and gain-of-function (mRNA injection) in Xenopus, in situ hybridization for neurogenic markers","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with molecular markers, single lab in Xenopus model","pmids":["18571637"],"is_preprint":false},{"year":2008,"finding":"Eya1 co-localizes with Sox2 in sensory progenitors of the inner ear and both proteins physically interact (co-immunoprecipitation). Allelic series experiments show Eya1 acts in a concentration-dependent manner to regulate genes required for sensory development and hair cell differentiation.","method":"Allelic series genetics (wild-type, heterozygous, hypomorphic alleles), co-immunoprecipitation of Eya1 and Sox2, immunofluorescence co-localization, hair cell/sensory marker analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus allelic series genetics, single lab","pmids":["18678597"],"is_preprint":false},{"year":2010,"finding":"Sipl1 and Rbck1 are novel Eya1-binding proteins identified by yeast two-hybrid screening and confirmed by GST pulldown and co-immunoprecipitation. Sipl1 and Rbck1 enhance Eya1 function as a co-activator for Six transcription factors.","method":"Yeast two-hybrid screen, GST pulldown, co-immunoprecipitation, reporter co-activation assay, morpholino knockdown in zebrafish","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple binding assays (Y2H, pulldown, Co-IP) with functional follow-up in reporter assay and zebrafish KD","pmids":["20956555"],"is_preprint":false},{"year":2011,"finding":"Murine mutation of both Six1 and Eya1 recapitulates del22q11 syndrome features. Fgf8 is a direct downstream effector of the Six1/Eya1 transcriptional complex, as shown by direct regulation assays. Six1/Eya1 genetically interact with Tbx1 (del22q11 gene) and Fgf8, establishing a Tbx1-Six1/Eya1-Fgf8 genetic pathway for cardiovascular and craniofacial morphogenesis.","method":"Compound Six1/Eya1 knockout mice, genetic interaction analysis with Tbx1 and Fgf8 compound mutants, direct transcriptional target analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound mutant genetic epistasis with direct downstream effector identification in multiple mutant combinations","pmids":["21364285"],"is_preprint":false},{"year":2011,"finding":"Eya1 regulates cell polarity, mitotic spindle orientation, and Numb asymmetric segregation in distal embryonic lung epithelium, likely through controlling aPKCζ phosphorylation. In Eya1-/- lungs, perpendicular division is not maintained and Numb segregates to both daughter cells, leading to inactivation of Notch signaling. Genetic activation of Notch partially rescues the Eya1-/- lung epithelial phenotype.","method":"Eya1-/- mouse knockout, spindle orientation imaging, immunofluorescence localization of polarity proteins, genetic rescue with Notch activation","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO with cellular phenotype, molecular mechanism via aPKCζ, and genetic rescue in the same study","pmids":["21385765"],"is_preprint":false},{"year":2012,"finding":"EYA1 and SIX1 interact directly with SWI/SNF chromatin-remodeling subunits BRG1 and BAF170 (co-immunoprecipitation) to cooperatively drive neurogenesis. Overexpression of Eya1 and Six1 converts non-neuronal epithelial and 3T3 cells into neurons expressing Neurog1, Neurod1, and mature neuronal markers. BRG1 ATPase activity is required for EYA1/SIX1-induced ectopic neurogenesis and for normal otic neurogenesis.","method":"Co-immunoprecipitation, gain-of-function overexpression in otocyst/cochlea/3T3 cells, BRG1 ATPase-dead dominant-negative mutant, in vivo conditional knockout","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding shown by Co-IP, functional requirement validated by ATPase mutant and in vivo KO, multiple cell systems tested","pmids":["22513373"],"is_preprint":false},{"year":2012,"finding":"Eya1/Six1 coexpression in mouse cochlear explants is sufficient to induce hair cell fate in nonsensory epithelium by activating Atoh1-dependent and Atoh1-independent pathways. Sox2 physically interacts with Eya1/Six1 and cooperates to synergistically activate Atoh1 transcription via direct binding to Sox- and Six-binding sites in Atoh1 enhancers.","method":"Cochlear explant overexpression, co-immunoprecipitation of Sox2/Eya1/Six1, reporter assay with Atoh1 enhancer mutations, loss-of-function in Eya1/Six1 mutants","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — gain-of-function in explants plus Co-IP plus enhancer mutagenesis reporter assays, multiple orthogonal methods","pmids":["22340499"],"is_preprint":false},{"year":2012,"finding":"Eya1 protein level fluctuates during the cell cycle, peaking during mitosis and dropping at M-to-G1 transition. APC/C-Cdh1 targets EYA1 for ubiquitin-mediated proteasomal degradation during mitotic exit; Cdh1 physically interacts with EYA1, and Cdh1 overexpression reduces EYA1 levels while Cdh1 knockdown stabilizes EYA1.","method":"Cell cycle synchronization, co-immunoprecipitation of EYA1-Cdh1, Cdh1 overexpression and siRNA knockdown, ubiquitination assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct physical interaction by Co-IP, functional regulation by both overexpression and RNAi, cell cycle synchronization experiments","pmids":["23263983"],"is_preprint":false},{"year":2013,"finding":"EYA1 phosphatase activity is required for breast cancer cell proliferation via cyclin D1 induction. EYA1 is recruited to the cyclin D1 AP-1 promoter site (but not the SIX1-responsive element), and its phosphatase function determines recruitment of CBP, RNA Pol II, and H3K9 acetylation at that site. The EYA1 phosphatase domain (but not transcriptional coactivator function) is required for cyclin D1 induction and proliferation.","method":"Phosphatase domain mutant (loss of catalytic activity), ChIP at cyclin D1 promoter, reporter assays with AP-1 site mutation, in vivo tumor growth assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — phosphatase-dead mutant, ChIP, reporter mutagenesis, and in vivo tumor assay in single rigorous study","pmids":["23636126"],"is_preprint":false},{"year":2014,"finding":"Eya1 interacts with Six2 and Myc to control nephron progenitor self-renewal. Six2 mediates nuclear translocation of Eya1; in the nucleus, Eya1 uses its threonine phosphatase activity to dephosphorylate/stabilize Myc in progenitor cells. Conditional Eya1 inactivation leads to loss of Six2 expression and premature epithelialization.","method":"Conditional knockout, cell fate tracing (Cre/loxP), co-immunoprecipitation of Eya1-Six2-Myc, in vitro threonine phosphatase assay, nuclear fractionation","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — conditional KO, Co-IP, in vitro phosphatase assay, nuclear translocation assay, cell fate tracing — multiple orthogonal methods","pmids":["25458011"],"is_preprint":false},{"year":2014,"finding":"BOR-associated Eya1 missense mutations S454P, L472R, and L550P lead to enhanced proteasomal degradation of the Eya1 protein. Six proteins protect Eya1 from proteasomal degradation; mutation L550P, which disrupts Six interaction, results in rapid protein degradation.","method":"Transfection of mutant constructs in mammalian cells, proteasome inhibitor treatment, co-immunoprecipitation with Six proteins, protein stability assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mutants tested with proteasome inhibitors and Co-IP, single lab","pmids":["24489909"],"is_preprint":false},{"year":2014,"finding":"Eya1 has an evolutionarily conserved CDC4 phosphodegron (CPD) targeted by GSK3 kinase and Fbw7 ubiquitin ligase for ubiquitination and degradation. PI3K/Akt and canonical Wnt signaling suppress Eya1 ubiquitination by restricting GSK3/Fbw7 activity. Compound Eya1+/-;Wnt9b+/- mutant mice show increased penetrance of renal defects, confirming genetic interaction.","method":"Ubiquitination assays, GSK3 pharmacological inhibition, Fbw7 genetic deletion, PI3K/Akt activation, compound mutant mice","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro ubiquitination assays plus in vivo compound mutant genetic validation, multiple pathway perturbations","pmids":["24752894"],"is_preprint":false},{"year":2014,"finding":"Akt1 kinase physically interacts with Eya1 and phosphorylates a conserved Akt consensus site on Eya1. PI3K/Akt signaling enhances Eya1 transcriptional activity by reducing Eya1 SUMOylation; SUMOylation inhibits Eya1 activity; phosphorylation-site mutant Eya1 fails to rescue migration phenotype of EYA1-depleted breast cancer cells.","method":"Co-immunoprecipitation of Akt1-Eya1, in vitro Akt phosphorylation assay, SUMO modification assay, rescue experiment with phosphosite mutant, cell migration assay","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct in vitro kinase assay, SUMO modification assay, Co-IP, and functional rescue with site mutant","pmids":["24954506"],"is_preprint":false},{"year":2015,"finding":"Eya1 phosphatase promotes Shh signaling in hindbrain development and medulloblastoma. Eya1 and Six1 together regulate Gli transcriptional activators downstream of Shh. shRNA phosphatome screen identified Eya1 as a positive regulator; the catalytic phosphatase activity of Eya1 is required for Shh pathway gene induction.","method":"shRNA screen of phosphatome, Shh pathway reporter assays, Eya1 conditional loss-of-function in cerebellum, medulloblastoma tumor growth assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased screen followed by loss-of-function in vivo with molecular pathway readout; phosphatase activity requirement shown","pmids":["25816987"],"is_preprint":false},{"year":2016,"finding":"EYA1's conserved C-terminal HAD domain has dual phosphatase activities (tyrosine and threonine). EYA1 dephosphorylates phospho-T58 of Myc with striking conformational preference demonstrated by NMR and enzymatic assay. EYA1-mediated Myc dephosphorylation at T58 reduces Myc-FBW7 interaction and Myc ubiquitination, stabilizing Myc. Both N- and C-terminal domains of EYA1 interact with substrates to enhance catalytic activity.","method":"In vitro phosphatase assay, NMR analysis of substrate conformation specificity, co-immunoprecipitation of Myc-FBW7, ubiquitination assay, shRNA depletion of EYA1","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic reconstitution with NMR structural validation plus biochemical co-IP and ubiquitination assays","pmids":["27795300"],"is_preprint":false},{"year":2017,"finding":"Eya1 is required for development of epibranchial placodes and proximal pharyngeal arches. Eya1 dephosphorylates phospho-threonine-2122 of Notch1 intracellular domain (Notch1 ICD), increasing Notch1 ICD stability and maintaining Notch signaling in non-neuronal epibranchial placodal cells. This Eya1-Notch regulatory axis specifies the non-neuronal (versus neuronal) cell fate from epibranchial placodes.","method":"Eya1-/- mouse knockout, in vitro threonine phosphatase assay on Notch1 ICD substrate, co-immunoprecipitation of Eya1-Notch1, Notch1 ICD stability assay, genetic rescue","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct in vitro phosphatase assay on defined substrate site, Co-IP, protein stability assay, and in vivo KO phenotype with genetic rescue","pmids":["29140246"],"is_preprint":false},{"year":2021,"finding":"Eya1 phosphatase inactivates aPKC by dephosphorylating threonine T410 in the aPKC activation loop, downstream of Shh signaling in cerebellar granule cell precursors. This Eya1-dependent aPKC inactivation reduces phosphorylation of Numb, promoting symmetric cell divisions and coupling spindle orientation to cell fate. Loss of Eya1 disrupts this Shh-Eya1-aPKC axis, impairing symmetric division.","method":"In vitro phosphatase assay on aPKC T410 substrate, loss-of-function genetics (partial gain/loss Shh pathway mutations), spindle orientation imaging, phospho-Numb immunofluorescence","journal":"Developmental neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct in vitro phosphatase assay on defined substrate, in vivo genetic validation, multiple cellular readouts","pmids":["33472197"],"is_preprint":false},{"year":2021,"finding":"Eya1 and Six2 interact with the Brg1-based SWI/SNF chromatin-remodeling complex during kidney development. Brg1 knockout leads to loss of Eya1 expression; Brg1 occupies a distal enhancer of Eya1 that drives nephron progenitor-specific expression. Brg1 enrichment at Pbx1 and Mycn regulatory elements requires Six2 activity.","method":"HA/Flag-tagged Eya1 knock-in mice, co-immunoprecipitation of Eya1-Six2-SWI/SNF, Brg1 conditional knockout, ChIP-seq genome-wide binding analysis, transcriptome profiling, enhancer reporter assays","journal":"Journal of the American Society of Nephrology : JASN","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — tagged knock-in Co-IP, genome-wide ChIP-seq, conditional KO, and enhancer reporter assays in a single rigorous study","pmids":["34716243"],"is_preprint":false},{"year":2021,"finding":"OTUB1 deubiquitinase directly interacts with EYA1 (identified by mass spectrometry and confirmed by co-immunoprecipitation) and deubiquitinates EYA1 to stabilize the protein, thereby promoting papillary thyroid carcinoma cell proliferation.","method":"Mass spectrometry interactome, co-immunoprecipitation of OTUB1-EYA1, ubiquitination assay, in vitro and in vivo proliferation assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP validated by MS, ubiquitination assay, functional rescue, single lab","pmids":["34773364"],"is_preprint":false},{"year":2022,"finding":"Eya1 occupies promoter sequences and physically interacts with REST corepressors (Rest, Hdac1, Cdyl, Hltf), chromatin-remodeling factors, RNA polymerases, and general transcription factors in nephron progenitor cells. REST-binding motifs are enriched at 76% of Eya1-occupied sites lacking H3K27ac, and Eya1 deficiency upregulates genes at these sites, indicating Eya1 exerts transcriptional repression through REST-corepressor complexes in addition to its known activation function.","method":"ChIP-seq, RNA-seq, proteomics (affinity purification-MS with HA/Flag-Eya1 knock-in), co-immunoprecipitation validation of Eya1-Rest/Hdac1/Cdyl/Hltf interactions","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genome-wide ChIP-seq, transcriptomics, affinity purification-MS, and Co-IP validation in a single comprehensive study","pmids":["36130284"],"is_preprint":false},{"year":2024,"finding":"EYA1 (and EYA4) directly interact with PLK1 and dephosphorylate pY445 on PLK1 in the G2 phase of the cell cycle. Dephosphorylation of PLK1-pY445 is required for centrosome maturation, PLK1 localization to centrosomes, and polo-box domain (PBD)-dependent PLK1 activation complex interactions. Depletion of EYA1 or chemical inhibition of EYA phosphatase activity reduces PLK1 activation, causing mitotic defects and cell death.","method":"Co-immunoprecipitation of EYA1-PLK1, in vitro tyrosine phosphatase assay on PLK1 pY445, molecular dynamics simulations, EYA1/EYA4 depletion, centrosome imaging, chemical EYA inhibitor treatment","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro phosphatase assay on defined substrate, Co-IP, structural simulation, and loss-of-function with multiple cellular readouts","pmids":["38360978"],"is_preprint":false}],"current_model":"EYA1 is a dual-function phosphatase (with both tyrosine and threonine phosphatase activities) and transcriptional co-activator that lacks intrinsic DNA-binding activity; it is recruited to chromatin through physical interaction with SIX family homeodomain proteins (primarily SIX1 and SIX2), which also mediate its nuclear translocation, and together this complex drives organogenesis of the ear, kidney, thymus, parathyroid, thyroid, lung, and craniofacial structures by acting upstream of key transcriptional programs (Gdnf, Fgf8, Neurog1/2, NeuroD1, Atoh1) and by recruiting chromatin-remodeling complexes (SWI/SNF-BRG1); EYA1's phosphatase activity targets include H2AX, aPKC-T410 (governing spindle orientation downstream of Shh), Notch1 ICD-pT2122 (regulating cell fate stability), Myc-pT58 (protecting Myc from FBW7-mediated degradation), and PLK1-pY445 (promoting mitotic PLK1 activation), while EYA1 protein levels are themselves regulated by APC/C-Cdh1–mediated proteasomal degradation at M-to-G1, by GSK3/Fbw7-mediated ubiquitination (suppressed by Wnt and PI3K/Akt signaling), by Akt1 phosphorylation reducing SUMOylation, and by OTUB1-mediated deubiquitination."},"narrative":{"mechanistic_narrative":"EYA1 is a dual-function transcriptional co-activator and protein phosphatase that drives organogenesis of the ear, kidney, thymus, parathyroid, thyroid, pharyngeal arches, and craniofacial structures by acting at the top of a Pax–Eya–Six regulatory hierarchy [PMID:10471511, PMID:12070080]. Lacking intrinsic DNA-binding activity, EYA1 is recruited to chromatin and translocated to the nucleus through direct physical interaction with SIX-family homeodomain proteins (SIX1, SIX2); BOR/BO-syndrome mutations in the conserved Eya domain disrupt this EYA1–SIX interaction and cause disease [PMID:11734542, PMID:15141091, PMID:15492887, PMID:25458011]. The EYA1–SIX complex activates target genes including Gdnf, Fgf8, Pax3, neurogenic bHLH determinants, and the hair-cell determinant Atoh1, and engages the BRG1/BAF170 SWI/SNF chromatin-remodeling machinery to reprogram cell fate and direct sensory and neuronal development [PMID:10471511, PMID:15496442, PMID:17098221, PMID:21364285, PMID:22513373, PMID:22340499, PMID:34716243]; it also represses a distinct gene set through REST-corepressor complexes (Rest, Hdac1, Cdyl, Hltf) [PMID:36130284]. Independently of its co-activator role, the conserved C-terminal HAD domain confers both tyrosine and threonine phosphatase activity that dephosphorylates specific substrates: Myc-pT58 to block FBW7-mediated degradation and stabilize Myc, Notch1-ICD-pT2122 to maintain Notch signaling and non-neuronal fate, aPKC-pT410 to control spindle orientation downstream of Shh, and PLK1-pY445 to promote centrosome maturation and mitotic PLK1 activation [PMID:25458011, PMID:27795300, PMID:29140246, PMID:33472197, PMID:38360978]; this catalytic activity, distinct from co-activation, drives cyclin D1 induction and proliferation in cancer [PMID:23636126, PMID:25816987]. EYA1 protein abundance is itself tightly controlled by APC/C-Cdh1 degradation at mitotic exit, GSK3/Fbw7-mediated ubiquitination (suppressed by Wnt and PI3K/Akt signaling), Akt1 phosphorylation that reduces inhibitory SUMOylation, and OTUB1-mediated deubiquitination [PMID:23263983, PMID:24752894, PMID:24954506, PMID:34773364].","teleology":[{"year":1999,"claim":"Established EYA1 as an essential upstream organizer of organ development by showing its loss eliminates ears and kidneys and abolishes downstream Six1 and Gdnf expression, defining the Pax–Eya–Six hierarchy.","evidence":"Targeted Eya1 knockout in mice with in situ marker analysis","pmids":["10471511"],"confidence":"High","gaps":["Did not define the molecular activity (phosphatase vs co-activator) underlying organogenesis","Mechanism of how Eya1 controls Six1 expression unresolved"]},{"year":2002,"claim":"Extended EYA1's upstream role to pharyngeal organogenesis, showing it is selectively required for Six1 and Gcm2 expression while Hox/Pax genes are preserved, establishing pathway specificity.","evidence":"Eya1 knockout mice with in situ marker analysis across thymus/parathyroid/thyroid primordia","pmids":["12070080"],"confidence":"High","gaps":["Direct transcriptional targets not identified","Did not address biochemical mechanism of gene activation"]},{"year":2004,"claim":"Defined the physical basis of EYA1 function by showing disease mutations in both EYA1 and SIX1 disrupt the EYA1–SIX1 interaction required to form a transcriptional complex, and that Six-mediated nuclear translocation is essential.","evidence":"Co-IP, yeast two-hybrid, EMSA on patient mutations; immunofluorescence of nuclear translocation","pmids":["15141091","15492887","15226428"],"confidence":"High","gaps":["Catalytic contribution of EYA1 not yet separated from co-activation","Structural basis of the interaction not resolved"]},{"year":2006,"claim":"Mapped EYA1/SIX as upstream regulators of Tbx1, Fgf8, Wnt5b, Pax3 and Pax1 across pharyngeal and myogenic lineages, refining the genetic epistasis and showing context-dependent placement relative to Pax genes.","evidence":"Compound Eya1/Eya2 and Six mutant mice with in situ markers and chromatin-based reporter assays","pmids":["17098221","16530750","16916509"],"confidence":"High","gaps":["Whether regulation is direct vs indirect for each target not uniformly shown","Phosphatase involvement untested"]},{"year":2008,"claim":"Showed EYA1 acts in a concentration-dependent manner and partners with Sox2 in sensory progenitors, linking dose to progenitor proliferation versus differentiation.","evidence":"Xenopus gain/loss-of-function, allelic series genetics, Eya1–Sox2 Co-IP and co-localization","pmids":["18571637","18678597"],"confidence":"Medium","gaps":["Single-lab Co-IP for Sox2 interaction","Mechanism of dose-dependent switching not biochemically defined"]},{"year":2010,"claim":"Identified Sipl1 and Rbck1 as co-factors that enhance EYA1's co-activator function for Six transcription factors, broadening the EYA1 interactome.","evidence":"Yeast two-hybrid screen, GST pulldown, Co-IP, reporter and zebrafish knockdown","pmids":["20956555"],"confidence":"Medium","gaps":["Single-lab characterization","In vivo mammalian relevance not established"]},{"year":2012,"claim":"Connected EYA1/SIX1 to chromatin remodeling and demonstrated cell-fate reprogramming, showing direct interaction with SWI/SNF (BRG1, BAF170) and Sox2 drives ectopic neurogenesis and hair-cell fate via Atoh1/Neurog1/Neurod1.","evidence":"Co-IP, gain-of-function in explants and cell lines, BRG1 ATPase-dead mutant, enhancer mutagenesis reporters, conditional KO","pmids":["22513373","22340499"],"confidence":"High","gaps":["Atoh1-independent pathway components not identified","Did not address phosphatase contribution to remodeling"]},{"year":2013,"claim":"Separated EYA1's phosphatase function from its co-activator function in cancer, showing phosphatase-dependent recruitment of CBP/Pol II and H3K9ac at the cyclin D1 AP-1 site drives proliferation independently of the SIX1-responsive element.","evidence":"Phosphatase-dead mutant, ChIP, AP-1 site reporter mutagenesis, in vivo tumor growth","pmids":["23636126"],"confidence":"High","gaps":["Phosphatase substrate at the cyclin D1 promoter not identified","Generalizability beyond breast cancer untested at this point"]},{"year":2014,"claim":"Linked EYA1's threonine phosphatase activity to progenitor self-renewal by showing nuclear Eya1, translocated by Six2, dephosphorylates and stabilizes Myc to maintain nephron progenitors.","evidence":"Conditional KO, cell fate tracing, Eya1–Six2–Myc Co-IP, in vitro threonine phosphatase assay, nuclear fractionation","pmids":["25458011"],"confidence":"High","gaps":["Precise Myc phosphosite not yet defined in this study","Coupling between phosphatase and transcriptional roles unresolved"]},{"year":2014,"claim":"Defined multiple post-translational controls of EYA1 abundance and activity: GSK3/Fbw7 degradation suppressed by Wnt and PI3K/Akt, and Akt1 phosphorylation that reduces inhibitory SUMOylation to boost transcriptional activity.","evidence":"Ubiquitination assays, GSK3/Fbw7 perturbation, compound mutant mice, Akt1–Eya1 Co-IP, in vitro kinase and SUMO assays, migration rescue","pmids":["24752894","24954506","24489909"],"confidence":"High","gaps":["Interplay among the distinct degradation pathways not integrated","Stoichiometry of SUMO vs phosphorylation control unquantified"]},{"year":2015,"claim":"Placed EYA1 phosphatase activity within Shh signaling, identifying it in an unbiased phosphatome screen as a positive regulator of Gli activators required for hindbrain development and medulloblastoma.","evidence":"shRNA phosphatome screen, Shh reporter assays, conditional cerebellar loss-of-function, tumor growth","pmids":["25816987"],"confidence":"High","gaps":["Direct phosphatase substrate in the Shh pathway not identified in this study","Mechanism linking Eya1 to Gli activation unresolved here"]},{"year":2016,"claim":"Provided structural and enzymatic definition of EYA1's dual tyrosine/threonine HAD phosphatase activity, demonstrating conformation-specific dephosphorylation of Myc-pT58 that blocks Myc–FBW7 binding and stabilizes Myc.","evidence":"In vitro phosphatase assay, NMR substrate-conformation analysis, Myc–FBW7 Co-IP, ubiquitination assay, shRNA depletion","pmids":["27795300"],"confidence":"High","gaps":["High-resolution co-crystal structure with substrate not obtained","Full substrate repertoire not enumerated"]},{"year":2017,"claim":"Identified Notch1-ICD-pT2122 as an EYA1 phosphatase substrate, showing dephosphorylation stabilizes Notch1 ICD to specify non-neuronal fate from epibranchial placodes.","evidence":"Eya1 KO, in vitro threonine phosphatase assay on Notch1 ICD, Co-IP, ICD stability assay, genetic rescue","pmids":["29140246"],"confidence":"High","gaps":["How fate choice integrates phosphatase and co-activator activities not resolved","Upstream signal controlling this axis not defined"]},{"year":2021,"claim":"Expanded the phosphatase substrate set to aPKC-pT410 and PLK1, coupling Shh signaling to spindle orientation/symmetric division (via aPKC inactivation and reduced phospho-Numb) and linking EYA1 to centrosome maturation and mitotic PLK1 activation.","evidence":"In vitro phosphatase assays on aPKC-T410 and PLK1-pY445, Co-IP, molecular dynamics, in vivo genetics, spindle/centrosome imaging, EYA inhibitor","pmids":["33472197","38360978"],"confidence":"High","gaps":["Whether one EYA1 pool serves both nuclear and mitotic substrates unclear","Regulation of substrate selectivity in time and space undefined"]},{"year":2021,"claim":"Defined genome-wide chromatin engagement in nephron progenitors, showing reciprocal regulation between Brg1/SWI/SNF and Eya1 (Brg1 occupies an Eya1 enhancer; Eya1/Six2 require Brg1 at Pbx1/Mycn elements) and identifying OTUB1 deubiquitination as a stabilizing input.","evidence":"Tagged knock-in Co-IP, ChIP-seq, conditional Brg1 KO, enhancer reporters; OTUB1–EYA1 MS/Co-IP and ubiquitination assays","pmids":["34716243","34773364"],"confidence":"High","gaps":["Single-lab OTUB1 interaction validation","Direct vs indirect targets among Brg1-dependent sites not fully parsed"]},{"year":2022,"claim":"Revealed a repressive arm of EYA1 function, showing it associates with REST-corepressor complexes (Rest, Hdac1, Cdyl, Hltf) at H3K27ac-poor sites whose genes are derepressed upon Eya1 loss, expanding its role beyond activation.","evidence":"ChIP-seq, RNA-seq, affinity purification-MS, Co-IP validation in nephron progenitors","pmids":["36130284"],"confidence":"High","gaps":["What toggles EYA1 between activator and repressor modes unknown","Whether repression requires phosphatase activity untested"]},{"year":null,"claim":"How EYA1 coordinates its distinct activities — co-activation, REST-mediated repression, and substrate-specific phosphatase action across nuclear and mitotic compartments — into a unified developmental and oncogenic program remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No integrated model linking phosphatase substrate choice to transcriptional context","Spatial/temporal control of activator-vs-repressor switching undefined","Full structural basis of substrate selectivity unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[19,24,25,26,30]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[24,18,23]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,13,15,16,29]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,6,15]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,19,29]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,19]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[30]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,2,4,7,13]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,15,16,29]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[17,26,30]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14,23,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,3,13,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[17,21,22,28]}],"complexes":["EYA1-SIX transcriptional complex","SWI/SNF (BRG1/BAF170)","REST corepressor complex"],"partners":["SIX1","SIX2","SOX2","BRG1","MYC","PLK1","OTUB1","NOTCH1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q99502","full_name":"Protein phosphatase EYA1","aliases":["Eyes absent homolog 1"],"length_aa":592,"mass_kda":64.6,"function":"Functions both as protein phosphatase and as transcriptional coactivator for SIX1, and probably also for SIX2, SIX4 and SIX5 (By similarity). Tyrosine phosphatase that dephosphorylates 'Tyr-142' of histone H2AX (H2AXY142ph) and promotes efficient DNA repair via the recruitment of DNA repair complexes containing MDC1. 'Tyr-142' phosphorylation of histone H2AX plays a central role in DNA repair and acts as a mark that distinguishes between apoptotic and repair responses to genotoxic stress (PubMed:19234442). Its function as histone phosphatase may contribute to its function in transcription regulation during organogenesis (By similarity). Also has phosphatase activity with proteins phosphorylated on Ser and Thr residues (in vitro) (By similarity). Required for normal embryonic development of the craniofacial and trunk skeleton, kidneys and ears (By similarity). Together with SIX1, it plays an important role in hypaxial muscle development; in this it is functionally redundant with EYA2 (By similarity)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q99502/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/EYA1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/EYA1","total_profiled":1310},"omim":[{"mim_id":"619019","title":"MICRO RNA 30D; MIR30D","url":"https://www.omim.org/entry/619019"},{"mim_id":"614187","title":"HYPERTELORISM, PREAURICULAR SINUS, PUNCTAL PITS, AND DEAFNESS; HPPD","url":"https://www.omim.org/entry/614187"},{"mim_id":"613705","title":"OROFACIAL CLEFT 10; OFC10","url":"https://www.omim.org/entry/613705"},{"mim_id":"610896","title":"BRANCHIOOTORENAL SYNDROME 2; BOR2","url":"https://www.omim.org/entry/610896"},{"mim_id":"609166","title":"BRANCHIOGENIC-DEAFNESS SYNDROME","url":"https://www.omim.org/entry/609166"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nuclear bodies","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":14.3},{"tissue":"parathyroid gland","ntpm":22.3},{"tissue":"prostate","ntpm":11.3}],"url":"https://www.proteinatlas.org/search/EYA1"},"hgnc":{"alias_symbol":[],"prev_symbol":["BOR"]},"alphafold":{"accession":"Q99502","domains":[{"cath_id":"3.40.50.12350","chopping":"322-388_455-588","consensus_level":"high","plddt":97.7575,"start":322,"end":588}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99502","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q99502-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q99502-F1-predicted_aligned_error_v6.png","plddt_mean":65.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EYA1","jax_strain_url":"https://www.jax.org/strain/search?query=EYA1"},"sequence":{"accession":"Q99502","fasta_url":"https://rest.uniprot.org/uniprotkb/Q99502.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q99502/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q99502"}},"corpus_meta":[{"pmid":"10471511","id":"PMC_10471511","title":"Eya1-deficient 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gastric carcinoma and its association with clinicopathological characteristics: a pilot study.","date":"2014","source":"Medical oncology (Northwood, London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/24729159","citation_count":11,"is_preprint":false},{"pmid":"33594762","id":"PMC_33594762","title":"Phage display targeting identifies EYA1 as a regulator of glioblastoma stem cell maintenance and proliferation.","date":"2021","source":"Stem cells (Dayton, Ohio)","url":"https://pubmed.ncbi.nlm.nih.gov/33594762","citation_count":11,"is_preprint":false},{"pmid":"24752894","id":"PMC_24752894","title":"The canonical wnt signal restricts the glycogen synthase kinase 3/fbw7-dependent ubiquitination and degradation of eya1 phosphatase.","date":"2014","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/24752894","citation_count":11,"is_preprint":false},{"pmid":"38360978","id":"PMC_38360978","title":"The Eyes Absent family members EYA4 and EYA1 promote PLK1 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In Eya1-/- embryos, Six1 (but not Pax) expression is Eya1-dependent, placing Eya1 upstream of Six1 in a Pax-Eya-Six regulatory hierarchy. Additionally, Gdnf expression is absent in Eya1-/- metanephric mesenchyme, placing Eya1 upstream of Gdnf in kidney development.\",\n      \"method\": \"Targeted gene inactivation in mice (loss-of-function), in situ hybridization for pathway marker expression\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular and molecular phenotypes, pathway placement confirmed by marker analysis; foundational paper replicated across subsequent studies\",\n      \"pmids\": [\"10471511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"BOR-associated missense mutations in the conserved Eya domain of EYA1 do not alter protein subcellular localization but disrupt protein-protein interactions (with Six proteins) in both yeast two-hybrid and mammalian co-immunoprecipitation assays, indicating that the Eya domain is required for complex formation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation in mammalian cells, immunofluorescence localization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction assays in two systems (yeast and mammalian), single lab\",\n      \"pmids\": [\"11734542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Eya1 is required for initiation of thymus, parathyroid, and thyroid morphogenesis. In Eya1-/- embryos, Six1 expression is markedly reduced in arch mesenchyme, pouch endoderm, and surface ectoderm of the pharyngeal region, confirming Eya1 acts upstream of Six1 in pharyngeal organogenesis. Gcm2 expression in 3rd pouch endoderm is lost in Eya1-/- embryos, while Hox and Pax gene expression is preserved, indicating selective pathway dependence.\",\n      \"method\": \"Targeted gene knockout in mice, in situ hybridization for pathway markers\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with specific molecular marker analysis defining pathway position; multiple organs analyzed\",\n      \"pmids\": [\"12070080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SIX1 mutations causing BOR/BO syndrome disrupt EYA1-SIX1 protein-protein interaction, and homeodomain mutations additionally abolish SIX1-DNA binding, demonstrating that EYA1 functions through physical interaction with SIX1 to form a transcriptional complex required for organogenesis.\",\n      \"method\": \"Co-immunoprecipitation, yeast two-hybrid, electrophoretic mobility shift assay (protein-DNA interaction), direct sequencing of patient mutations\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, yeast two-hybrid, EMSA) with disease-causing mutations; replicated across multiple kindreds\",\n      \"pmids\": [\"15141091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Eya1 and Six1 are necessary for normal maintenance of neurogenesis in vestibuloacoustic neurons and epibranchial placode-derived ganglia. In Eya1/Six1 mutants, epibranchial progenitor cells fail to express Neurog2 and other bHLH and Phox2 genes required for neuronal determination, resulting in apoptosis, placing Eya1 upstream of neurogenic determination factors.\",\n      \"method\": \"Genetic loss-of-function (Eya1-/- and Six1-/- mice), in situ hybridization for neurogenic markers\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO models with specific molecular marker analysis across multiple neuronal lineages\",\n      \"pmids\": [\"15496442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Six1 and Eya1 proteins expressed together in slow-twitch soleus muscle drive fiber-type transition to fast-twitch glycolytic phenotype. Six1 and Eya1 proteins accumulate preferentially in nuclei of fast-twitch muscles and cooperatively activate MEF3/Six DNA-binding element-dependent transcription of fast-fiber genes.\",\n      \"method\": \"Forced transgenic co-expression in mouse skeletal muscle, reporter assays, immunolocalization, myosin heavy chain isoform analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo gain-of-function in adult muscle with multiple molecular readouts confirming transcriptional mechanism\",\n      \"pmids\": [\"15226428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"EYA1 Eya domain (EYA1HR) interacts with SIX1 in yeast two-hybrid assays. After co-expression with Six1, EYA1HR is translocated from cytoplasm to nucleus, demonstrating that Six1-mediated nuclear translocation is required for EYA1 transcriptional activity.\",\n      \"method\": \"Yeast two-hybrid, immunofluorescence co-localization, alpha-galactosidase reporter activity\",\n      \"journal\": \"Journal of the Association for Research in Otolaryngology : JARO\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (yeast two-hybrid + immunofluorescence), single lab\",\n      \"pmids\": [\"15492887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Eya1 and Eya2 double knockout results in loss of Pax3 expression in ventrolateral dermomyotomes, preventing hypaxial lip formation and limb muscle progenitor delamination. Six proteins recruit Eya proteins to MEF3 DNA sites to drive transcription in dermomyotomal cells, establishing genetic epistasis: Six and Eya genes act upstream of Pax3 in hypaxial myogenic commitment.\",\n      \"method\": \"Compound Eya1/Eya2 double knockout mice, in situ hybridization, chromatin-based reporter assays, genetic epistasis analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound KO with defined molecular phenotype and pathway ordering via epistasis across multiple models\",\n      \"pmids\": [\"17098221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In pharyngeal pouch development, Eya1 acts upstream of Tbx1, Fgf8, and Wnt5b expression in the pouch endoderm. Pax1 expression in pharyngeal pouches requires both Eya1 and Six1 function, while Eya1 and Six1 expression in the pouches does not require Pax1/Pax9 (i.e., Eya1 is not downstream of Pax1/Pax9 in this context).\",\n      \"method\": \"Genetic loss-of-function (Six1-/-, Six1/Six4 double mutant, Eya1-/- mice), in situ hybridization for pathway markers\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mutant combinations with specific marker analysis defining pathway hierarchy\",\n      \"pmids\": [\"16530750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Eya1-/- otic epithelium shows reduced cell proliferation from E8.5 and increased apoptosis from E9.0. Genetic evidence shows Pax2 interacts with Eya1 during inner ear morphogenesis—compound Pax2/Eya1 mutants reveal synergistic defects in all sensory areas, indicating functional interaction critical for sensory development.\",\n      \"method\": \"Loss-of-function genetics (Eya1-/-, Pax2-/-, compound mutants), BrdU proliferation assay, TUNEL apoptosis assay, latex paint-filling of inner ear\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound genetic epistasis with cellular assays providing mechanistic basis for Eya1-Pax2 interaction in inner ear\",\n      \"pmids\": [\"16916509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Eya1 and Six1 regulate placodal neurogenesis in Xenopus by expanding SoxB1 gene expression (Sox2, Sox3) at higher doses to maintain progenitor proliferation, and by promoting neuronal differentiation at lower doses, downstream of or parallel to Ngnr1.\",\n      \"method\": \"Loss-of-function (morpholino knockdown) and gain-of-function (mRNA injection) in Xenopus, in situ hybridization for neurogenic markers\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with molecular markers, single lab in Xenopus model\",\n      \"pmids\": [\"18571637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Eya1 co-localizes with Sox2 in sensory progenitors of the inner ear and both proteins physically interact (co-immunoprecipitation). Allelic series experiments show Eya1 acts in a concentration-dependent manner to regulate genes required for sensory development and hair cell differentiation.\",\n      \"method\": \"Allelic series genetics (wild-type, heterozygous, hypomorphic alleles), co-immunoprecipitation of Eya1 and Sox2, immunofluorescence co-localization, hair cell/sensory marker analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus allelic series genetics, single lab\",\n      \"pmids\": [\"18678597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sipl1 and Rbck1 are novel Eya1-binding proteins identified by yeast two-hybrid screening and confirmed by GST pulldown and co-immunoprecipitation. Sipl1 and Rbck1 enhance Eya1 function as a co-activator for Six transcription factors.\",\n      \"method\": \"Yeast two-hybrid screen, GST pulldown, co-immunoprecipitation, reporter co-activation assay, morpholino knockdown in zebrafish\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple binding assays (Y2H, pulldown, Co-IP) with functional follow-up in reporter assay and zebrafish KD\",\n      \"pmids\": [\"20956555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Murine mutation of both Six1 and Eya1 recapitulates del22q11 syndrome features. Fgf8 is a direct downstream effector of the Six1/Eya1 transcriptional complex, as shown by direct regulation assays. Six1/Eya1 genetically interact with Tbx1 (del22q11 gene) and Fgf8, establishing a Tbx1-Six1/Eya1-Fgf8 genetic pathway for cardiovascular and craniofacial morphogenesis.\",\n      \"method\": \"Compound Six1/Eya1 knockout mice, genetic interaction analysis with Tbx1 and Fgf8 compound mutants, direct transcriptional target analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound mutant genetic epistasis with direct downstream effector identification in multiple mutant combinations\",\n      \"pmids\": [\"21364285\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Eya1 regulates cell polarity, mitotic spindle orientation, and Numb asymmetric segregation in distal embryonic lung epithelium, likely through controlling aPKCζ phosphorylation. In Eya1-/- lungs, perpendicular division is not maintained and Numb segregates to both daughter cells, leading to inactivation of Notch signaling. Genetic activation of Notch partially rescues the Eya1-/- lung epithelial phenotype.\",\n      \"method\": \"Eya1-/- mouse knockout, spindle orientation imaging, immunofluorescence localization of polarity proteins, genetic rescue with Notch activation\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO with cellular phenotype, molecular mechanism via aPKCζ, and genetic rescue in the same study\",\n      \"pmids\": [\"21385765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"EYA1 and SIX1 interact directly with SWI/SNF chromatin-remodeling subunits BRG1 and BAF170 (co-immunoprecipitation) to cooperatively drive neurogenesis. Overexpression of Eya1 and Six1 converts non-neuronal epithelial and 3T3 cells into neurons expressing Neurog1, Neurod1, and mature neuronal markers. BRG1 ATPase activity is required for EYA1/SIX1-induced ectopic neurogenesis and for normal otic neurogenesis.\",\n      \"method\": \"Co-immunoprecipitation, gain-of-function overexpression in otocyst/cochlea/3T3 cells, BRG1 ATPase-dead dominant-negative mutant, in vivo conditional knockout\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding shown by Co-IP, functional requirement validated by ATPase mutant and in vivo KO, multiple cell systems tested\",\n      \"pmids\": [\"22513373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Eya1/Six1 coexpression in mouse cochlear explants is sufficient to induce hair cell fate in nonsensory epithelium by activating Atoh1-dependent and Atoh1-independent pathways. Sox2 physically interacts with Eya1/Six1 and cooperates to synergistically activate Atoh1 transcription via direct binding to Sox- and Six-binding sites in Atoh1 enhancers.\",\n      \"method\": \"Cochlear explant overexpression, co-immunoprecipitation of Sox2/Eya1/Six1, reporter assay with Atoh1 enhancer mutations, loss-of-function in Eya1/Six1 mutants\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — gain-of-function in explants plus Co-IP plus enhancer mutagenesis reporter assays, multiple orthogonal methods\",\n      \"pmids\": [\"22340499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Eya1 protein level fluctuates during the cell cycle, peaking during mitosis and dropping at M-to-G1 transition. APC/C-Cdh1 targets EYA1 for ubiquitin-mediated proteasomal degradation during mitotic exit; Cdh1 physically interacts with EYA1, and Cdh1 overexpression reduces EYA1 levels while Cdh1 knockdown stabilizes EYA1.\",\n      \"method\": \"Cell cycle synchronization, co-immunoprecipitation of EYA1-Cdh1, Cdh1 overexpression and siRNA knockdown, ubiquitination assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct physical interaction by Co-IP, functional regulation by both overexpression and RNAi, cell cycle synchronization experiments\",\n      \"pmids\": [\"23263983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"EYA1 phosphatase activity is required for breast cancer cell proliferation via cyclin D1 induction. EYA1 is recruited to the cyclin D1 AP-1 promoter site (but not the SIX1-responsive element), and its phosphatase function determines recruitment of CBP, RNA Pol II, and H3K9 acetylation at that site. The EYA1 phosphatase domain (but not transcriptional coactivator function) is required for cyclin D1 induction and proliferation.\",\n      \"method\": \"Phosphatase domain mutant (loss of catalytic activity), ChIP at cyclin D1 promoter, reporter assays with AP-1 site mutation, in vivo tumor growth assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — phosphatase-dead mutant, ChIP, reporter mutagenesis, and in vivo tumor assay in single rigorous study\",\n      \"pmids\": [\"23636126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Eya1 interacts with Six2 and Myc to control nephron progenitor self-renewal. Six2 mediates nuclear translocation of Eya1; in the nucleus, Eya1 uses its threonine phosphatase activity to dephosphorylate/stabilize Myc in progenitor cells. Conditional Eya1 inactivation leads to loss of Six2 expression and premature epithelialization.\",\n      \"method\": \"Conditional knockout, cell fate tracing (Cre/loxP), co-immunoprecipitation of Eya1-Six2-Myc, in vitro threonine phosphatase assay, nuclear fractionation\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — conditional KO, Co-IP, in vitro phosphatase assay, nuclear translocation assay, cell fate tracing — multiple orthogonal methods\",\n      \"pmids\": [\"25458011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BOR-associated Eya1 missense mutations S454P, L472R, and L550P lead to enhanced proteasomal degradation of the Eya1 protein. Six proteins protect Eya1 from proteasomal degradation; mutation L550P, which disrupts Six interaction, results in rapid protein degradation.\",\n      \"method\": \"Transfection of mutant constructs in mammalian cells, proteasome inhibitor treatment, co-immunoprecipitation with Six proteins, protein stability assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mutants tested with proteasome inhibitors and Co-IP, single lab\",\n      \"pmids\": [\"24489909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Eya1 has an evolutionarily conserved CDC4 phosphodegron (CPD) targeted by GSK3 kinase and Fbw7 ubiquitin ligase for ubiquitination and degradation. PI3K/Akt and canonical Wnt signaling suppress Eya1 ubiquitination by restricting GSK3/Fbw7 activity. Compound Eya1+/-;Wnt9b+/- mutant mice show increased penetrance of renal defects, confirming genetic interaction.\",\n      \"method\": \"Ubiquitination assays, GSK3 pharmacological inhibition, Fbw7 genetic deletion, PI3K/Akt activation, compound mutant mice\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro ubiquitination assays plus in vivo compound mutant genetic validation, multiple pathway perturbations\",\n      \"pmids\": [\"24752894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Akt1 kinase physically interacts with Eya1 and phosphorylates a conserved Akt consensus site on Eya1. PI3K/Akt signaling enhances Eya1 transcriptional activity by reducing Eya1 SUMOylation; SUMOylation inhibits Eya1 activity; phosphorylation-site mutant Eya1 fails to rescue migration phenotype of EYA1-depleted breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation of Akt1-Eya1, in vitro Akt phosphorylation assay, SUMO modification assay, rescue experiment with phosphosite mutant, cell migration assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct in vitro kinase assay, SUMO modification assay, Co-IP, and functional rescue with site mutant\",\n      \"pmids\": [\"24954506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Eya1 phosphatase promotes Shh signaling in hindbrain development and medulloblastoma. Eya1 and Six1 together regulate Gli transcriptional activators downstream of Shh. shRNA phosphatome screen identified Eya1 as a positive regulator; the catalytic phosphatase activity of Eya1 is required for Shh pathway gene induction.\",\n      \"method\": \"shRNA screen of phosphatome, Shh pathway reporter assays, Eya1 conditional loss-of-function in cerebellum, medulloblastoma tumor growth assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased screen followed by loss-of-function in vivo with molecular pathway readout; phosphatase activity requirement shown\",\n      \"pmids\": [\"25816987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"EYA1's conserved C-terminal HAD domain has dual phosphatase activities (tyrosine and threonine). EYA1 dephosphorylates phospho-T58 of Myc with striking conformational preference demonstrated by NMR and enzymatic assay. EYA1-mediated Myc dephosphorylation at T58 reduces Myc-FBW7 interaction and Myc ubiquitination, stabilizing Myc. Both N- and C-terminal domains of EYA1 interact with substrates to enhance catalytic activity.\",\n      \"method\": \"In vitro phosphatase assay, NMR analysis of substrate conformation specificity, co-immunoprecipitation of Myc-FBW7, ubiquitination assay, shRNA depletion of EYA1\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic reconstitution with NMR structural validation plus biochemical co-IP and ubiquitination assays\",\n      \"pmids\": [\"27795300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Eya1 is required for development of epibranchial placodes and proximal pharyngeal arches. Eya1 dephosphorylates phospho-threonine-2122 of Notch1 intracellular domain (Notch1 ICD), increasing Notch1 ICD stability and maintaining Notch signaling in non-neuronal epibranchial placodal cells. This Eya1-Notch regulatory axis specifies the non-neuronal (versus neuronal) cell fate from epibranchial placodes.\",\n      \"method\": \"Eya1-/- mouse knockout, in vitro threonine phosphatase assay on Notch1 ICD substrate, co-immunoprecipitation of Eya1-Notch1, Notch1 ICD stability assay, genetic rescue\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct in vitro phosphatase assay on defined substrate site, Co-IP, protein stability assay, and in vivo KO phenotype with genetic rescue\",\n      \"pmids\": [\"29140246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Eya1 phosphatase inactivates aPKC by dephosphorylating threonine T410 in the aPKC activation loop, downstream of Shh signaling in cerebellar granule cell precursors. This Eya1-dependent aPKC inactivation reduces phosphorylation of Numb, promoting symmetric cell divisions and coupling spindle orientation to cell fate. Loss of Eya1 disrupts this Shh-Eya1-aPKC axis, impairing symmetric division.\",\n      \"method\": \"In vitro phosphatase assay on aPKC T410 substrate, loss-of-function genetics (partial gain/loss Shh pathway mutations), spindle orientation imaging, phospho-Numb immunofluorescence\",\n      \"journal\": \"Developmental neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct in vitro phosphatase assay on defined substrate, in vivo genetic validation, multiple cellular readouts\",\n      \"pmids\": [\"33472197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Eya1 and Six2 interact with the Brg1-based SWI/SNF chromatin-remodeling complex during kidney development. Brg1 knockout leads to loss of Eya1 expression; Brg1 occupies a distal enhancer of Eya1 that drives nephron progenitor-specific expression. Brg1 enrichment at Pbx1 and Mycn regulatory elements requires Six2 activity.\",\n      \"method\": \"HA/Flag-tagged Eya1 knock-in mice, co-immunoprecipitation of Eya1-Six2-SWI/SNF, Brg1 conditional knockout, ChIP-seq genome-wide binding analysis, transcriptome profiling, enhancer reporter assays\",\n      \"journal\": \"Journal of the American Society of Nephrology : JASN\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — tagged knock-in Co-IP, genome-wide ChIP-seq, conditional KO, and enhancer reporter assays in a single rigorous study\",\n      \"pmids\": [\"34716243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"OTUB1 deubiquitinase directly interacts with EYA1 (identified by mass spectrometry and confirmed by co-immunoprecipitation) and deubiquitinates EYA1 to stabilize the protein, thereby promoting papillary thyroid carcinoma cell proliferation.\",\n      \"method\": \"Mass spectrometry interactome, co-immunoprecipitation of OTUB1-EYA1, ubiquitination assay, in vitro and in vivo proliferation assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP validated by MS, ubiquitination assay, functional rescue, single lab\",\n      \"pmids\": [\"34773364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Eya1 occupies promoter sequences and physically interacts with REST corepressors (Rest, Hdac1, Cdyl, Hltf), chromatin-remodeling factors, RNA polymerases, and general transcription factors in nephron progenitor cells. REST-binding motifs are enriched at 76% of Eya1-occupied sites lacking H3K27ac, and Eya1 deficiency upregulates genes at these sites, indicating Eya1 exerts transcriptional repression through REST-corepressor complexes in addition to its known activation function.\",\n      \"method\": \"ChIP-seq, RNA-seq, proteomics (affinity purification-MS with HA/Flag-Eya1 knock-in), co-immunoprecipitation validation of Eya1-Rest/Hdac1/Cdyl/Hltf interactions\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genome-wide ChIP-seq, transcriptomics, affinity purification-MS, and Co-IP validation in a single comprehensive study\",\n      \"pmids\": [\"36130284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"EYA1 (and EYA4) directly interact with PLK1 and dephosphorylate pY445 on PLK1 in the G2 phase of the cell cycle. Dephosphorylation of PLK1-pY445 is required for centrosome maturation, PLK1 localization to centrosomes, and polo-box domain (PBD)-dependent PLK1 activation complex interactions. Depletion of EYA1 or chemical inhibition of EYA phosphatase activity reduces PLK1 activation, causing mitotic defects and cell death.\",\n      \"method\": \"Co-immunoprecipitation of EYA1-PLK1, in vitro tyrosine phosphatase assay on PLK1 pY445, molecular dynamics simulations, EYA1/EYA4 depletion, centrosome imaging, chemical EYA inhibitor treatment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro phosphatase assay on defined substrate, Co-IP, structural simulation, and loss-of-function with multiple cellular readouts\",\n      \"pmids\": [\"38360978\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"EYA1 is a dual-function phosphatase (with both tyrosine and threonine phosphatase activities) and transcriptional co-activator that lacks intrinsic DNA-binding activity; it is recruited to chromatin through physical interaction with SIX family homeodomain proteins (primarily SIX1 and SIX2), which also mediate its nuclear translocation, and together this complex drives organogenesis of the ear, kidney, thymus, parathyroid, thyroid, lung, and craniofacial structures by acting upstream of key transcriptional programs (Gdnf, Fgf8, Neurog1/2, NeuroD1, Atoh1) and by recruiting chromatin-remodeling complexes (SWI/SNF-BRG1); EYA1's phosphatase activity targets include H2AX, aPKC-T410 (governing spindle orientation downstream of Shh), Notch1 ICD-pT2122 (regulating cell fate stability), Myc-pT58 (protecting Myc from FBW7-mediated degradation), and PLK1-pY445 (promoting mitotic PLK1 activation), while EYA1 protein levels are themselves regulated by APC/C-Cdh1–mediated proteasomal degradation at M-to-G1, by GSK3/Fbw7-mediated ubiquitination (suppressed by Wnt and PI3K/Akt signaling), by Akt1 phosphorylation reducing SUMOylation, and by OTUB1-mediated deubiquitination.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"EYA1 is a dual-function transcriptional co-activator and protein phosphatase that drives organogenesis of the ear, kidney, thymus, parathyroid, thyroid, pharyngeal arches, and craniofacial structures by acting at the top of a Pax–Eya–Six regulatory hierarchy [#0, #2]. Lacking intrinsic DNA-binding activity, EYA1 is recruited to chromatin and translocated to the nucleus through direct physical interaction with SIX-family homeodomain proteins (SIX1, SIX2); BOR/BO-syndrome mutations in the conserved Eya domain disrupt this EYA1–SIX interaction and cause disease [#1, #3, #6, #19]. The EYA1–SIX complex activates target genes including Gdnf, Fgf8, Pax3, neurogenic bHLH determinants, and the hair-cell determinant Atoh1, and engages the BRG1/BAF170 SWI/SNF chromatin-remodeling machinery to reprogram cell fate and direct sensory and neuronal development [#0, #4, #7, #13, #15, #16, #27]; it also represses a distinct gene set through REST-corepressor complexes (Rest, Hdac1, Cdyl, Hltf) [#29]. Independently of its co-activator role, the conserved C-terminal HAD domain confers both tyrosine and threonine phosphatase activity that dephosphorylates specific substrates: Myc-pT58 to block FBW7-mediated degradation and stabilize Myc, Notch1-ICD-pT2122 to maintain Notch signaling and non-neuronal fate, aPKC-pT410 to control spindle orientation downstream of Shh, and PLK1-pY445 to promote centrosome maturation and mitotic PLK1 activation [#19, #24, #25, #26, #30]; this catalytic activity, distinct from co-activation, drives cyclin D1 induction and proliferation in cancer [#18, #23]. EYA1 protein abundance is itself tightly controlled by APC/C-Cdh1 degradation at mitotic exit, GSK3/Fbw7-mediated ubiquitination (suppressed by Wnt and PI3K/Akt signaling), Akt1 phosphorylation that reduces inhibitory SUMOylation, and OTUB1-mediated deubiquitination [#17, #21, #22, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established EYA1 as an essential upstream organizer of organ development by showing its loss eliminates ears and kidneys and abolishes downstream Six1 and Gdnf expression, defining the Pax–Eya–Six hierarchy.\",\n      \"evidence\": \"Targeted Eya1 knockout in mice with in situ marker analysis\",\n      \"pmids\": [\"10471511\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular activity (phosphatase vs co-activator) underlying organogenesis\", \"Mechanism of how Eya1 controls Six1 expression unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Extended EYA1's upstream role to pharyngeal organogenesis, showing it is selectively required for Six1 and Gcm2 expression while Hox/Pax genes are preserved, establishing pathway specificity.\",\n      \"evidence\": \"Eya1 knockout mice with in situ marker analysis across thymus/parathyroid/thyroid primordia\",\n      \"pmids\": [\"12070080\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets not identified\", \"Did not address biochemical mechanism of gene activation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the physical basis of EYA1 function by showing disease mutations in both EYA1 and SIX1 disrupt the EYA1–SIX1 interaction required to form a transcriptional complex, and that Six-mediated nuclear translocation is essential.\",\n      \"evidence\": \"Co-IP, yeast two-hybrid, EMSA on patient mutations; immunofluorescence of nuclear translocation\",\n      \"pmids\": [\"15141091\", \"15492887\", \"15226428\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic contribution of EYA1 not yet separated from co-activation\", \"Structural basis of the interaction not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped EYA1/SIX as upstream regulators of Tbx1, Fgf8, Wnt5b, Pax3 and Pax1 across pharyngeal and myogenic lineages, refining the genetic epistasis and showing context-dependent placement relative to Pax genes.\",\n      \"evidence\": \"Compound Eya1/Eya2 and Six mutant mice with in situ markers and chromatin-based reporter assays\",\n      \"pmids\": [\"17098221\", \"16530750\", \"16916509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether regulation is direct vs indirect for each target not uniformly shown\", \"Phosphatase involvement untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed EYA1 acts in a concentration-dependent manner and partners with Sox2 in sensory progenitors, linking dose to progenitor proliferation versus differentiation.\",\n      \"evidence\": \"Xenopus gain/loss-of-function, allelic series genetics, Eya1–Sox2 Co-IP and co-localization\",\n      \"pmids\": [\"18571637\", \"18678597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP for Sox2 interaction\", \"Mechanism of dose-dependent switching not biochemically defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified Sipl1 and Rbck1 as co-factors that enhance EYA1's co-activator function for Six transcription factors, broadening the EYA1 interactome.\",\n      \"evidence\": \"Yeast two-hybrid screen, GST pulldown, Co-IP, reporter and zebrafish knockdown\",\n      \"pmids\": [\"20956555\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab characterization\", \"In vivo mammalian relevance not established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected EYA1/SIX1 to chromatin remodeling and demonstrated cell-fate reprogramming, showing direct interaction with SWI/SNF (BRG1, BAF170) and Sox2 drives ectopic neurogenesis and hair-cell fate via Atoh1/Neurog1/Neurod1.\",\n      \"evidence\": \"Co-IP, gain-of-function in explants and cell lines, BRG1 ATPase-dead mutant, enhancer mutagenesis reporters, conditional KO\",\n      \"pmids\": [\"22513373\", \"22340499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atoh1-independent pathway components not identified\", \"Did not address phosphatase contribution to remodeling\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Separated EYA1's phosphatase function from its co-activator function in cancer, showing phosphatase-dependent recruitment of CBP/Pol II and H3K9ac at the cyclin D1 AP-1 site drives proliferation independently of the SIX1-responsive element.\",\n      \"evidence\": \"Phosphatase-dead mutant, ChIP, AP-1 site reporter mutagenesis, in vivo tumor growth\",\n      \"pmids\": [\"23636126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase substrate at the cyclin D1 promoter not identified\", \"Generalizability beyond breast cancer untested at this point\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked EYA1's threonine phosphatase activity to progenitor self-renewal by showing nuclear Eya1, translocated by Six2, dephosphorylates and stabilizes Myc to maintain nephron progenitors.\",\n      \"evidence\": \"Conditional KO, cell fate tracing, Eya1–Six2–Myc Co-IP, in vitro threonine phosphatase assay, nuclear fractionation\",\n      \"pmids\": [\"25458011\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise Myc phosphosite not yet defined in this study\", \"Coupling between phosphatase and transcriptional roles unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined multiple post-translational controls of EYA1 abundance and activity: GSK3/Fbw7 degradation suppressed by Wnt and PI3K/Akt, and Akt1 phosphorylation that reduces inhibitory SUMOylation to boost transcriptional activity.\",\n      \"evidence\": \"Ubiquitination assays, GSK3/Fbw7 perturbation, compound mutant mice, Akt1–Eya1 Co-IP, in vitro kinase and SUMO assays, migration rescue\",\n      \"pmids\": [\"24752894\", \"24954506\", \"24489909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay among the distinct degradation pathways not integrated\", \"Stoichiometry of SUMO vs phosphorylation control unquantified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed EYA1 phosphatase activity within Shh signaling, identifying it in an unbiased phosphatome screen as a positive regulator of Gli activators required for hindbrain development and medulloblastoma.\",\n      \"evidence\": \"shRNA phosphatome screen, Shh reporter assays, conditional cerebellar loss-of-function, tumor growth\",\n      \"pmids\": [\"25816987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphatase substrate in the Shh pathway not identified in this study\", \"Mechanism linking Eya1 to Gli activation unresolved here\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided structural and enzymatic definition of EYA1's dual tyrosine/threonine HAD phosphatase activity, demonstrating conformation-specific dephosphorylation of Myc-pT58 that blocks Myc–FBW7 binding and stabilizes Myc.\",\n      \"evidence\": \"In vitro phosphatase assay, NMR substrate-conformation analysis, Myc–FBW7 Co-IP, ubiquitination assay, shRNA depletion\",\n      \"pmids\": [\"27795300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution co-crystal structure with substrate not obtained\", \"Full substrate repertoire not enumerated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified Notch1-ICD-pT2122 as an EYA1 phosphatase substrate, showing dephosphorylation stabilizes Notch1 ICD to specify non-neuronal fate from epibranchial placodes.\",\n      \"evidence\": \"Eya1 KO, in vitro threonine phosphatase assay on Notch1 ICD, Co-IP, ICD stability assay, genetic rescue\",\n      \"pmids\": [\"29140246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How fate choice integrates phosphatase and co-activator activities not resolved\", \"Upstream signal controlling this axis not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expanded the phosphatase substrate set to aPKC-pT410 and PLK1, coupling Shh signaling to spindle orientation/symmetric division (via aPKC inactivation and reduced phospho-Numb) and linking EYA1 to centrosome maturation and mitotic PLK1 activation.\",\n      \"evidence\": \"In vitro phosphatase assays on aPKC-T410 and PLK1-pY445, Co-IP, molecular dynamics, in vivo genetics, spindle/centrosome imaging, EYA inhibitor\",\n      \"pmids\": [\"33472197\", \"38360978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether one EYA1 pool serves both nuclear and mitotic substrates unclear\", \"Regulation of substrate selectivity in time and space undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined genome-wide chromatin engagement in nephron progenitors, showing reciprocal regulation between Brg1/SWI/SNF and Eya1 (Brg1 occupies an Eya1 enhancer; Eya1/Six2 require Brg1 at Pbx1/Mycn elements) and identifying OTUB1 deubiquitination as a stabilizing input.\",\n      \"evidence\": \"Tagged knock-in Co-IP, ChIP-seq, conditional Brg1 KO, enhancer reporters; OTUB1–EYA1 MS/Co-IP and ubiquitination assays\",\n      \"pmids\": [\"34716243\", \"34773364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single-lab OTUB1 interaction validation\", \"Direct vs indirect targets among Brg1-dependent sites not fully parsed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Revealed a repressive arm of EYA1 function, showing it associates with REST-corepressor complexes (Rest, Hdac1, Cdyl, Hltf) at H3K27ac-poor sites whose genes are derepressed upon Eya1 loss, expanding its role beyond activation.\",\n      \"evidence\": \"ChIP-seq, RNA-seq, affinity purification-MS, Co-IP validation in nephron progenitors\",\n      \"pmids\": [\"36130284\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"What toggles EYA1 between activator and repressor modes unknown\", \"Whether repression requires phosphatase activity untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How EYA1 coordinates its distinct activities — co-activation, REST-mediated repression, and substrate-specific phosphatase action across nuclear and mitotic compartments — into a unified developmental and oncogenic program remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No integrated model linking phosphatase substrate choice to transcriptional context\", \"Spatial/temporal control of activator-vs-repressor switching undefined\", \"Full structural basis of substrate selectivity unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [19, 24, 25, 26, 30]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [24, 18, 23]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 13, 15, 16, 29]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 6, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 19, 29]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 19]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [30]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 2, 4, 7, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 15, 16, 29]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [17, 26, 30]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14, 23, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 3, 13, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [17, 21, 22, 28]}\n    ],\n    \"complexes\": [\"EYA1-SIX transcriptional complex\", \"SWI/SNF (BRG1/BAF170)\", \"REST corepressor complex\"],\n    \"partners\": [\"SIX1\", \"SIX2\", \"SOX2\", \"BRG1\", \"MYC\", \"PLK1\", \"OTUB1\", \"NOTCH1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}