{"gene":"FOXJ1","run_date":"2026-04-28T17:46:04","timeline":{"discoveries":[{"year":2000,"finding":"Targeted deletion of Foxj1 (HFH-4) in mice results in complete absence of 9+2 motile cilia in airway epithelial cells, ependyma, and oviduct, while 9+0 sensory cilia (e.g., olfactory) are unaffected. Ultrastructural analysis showed that defective ciliogenesis is due to abnormal centriole migration and/or failure of apical membrane docking, indicating Foxj1 functions to direct basal body positioning and anchoring.","method":"Targeted gene knockout in mice, electron microscopy, in situ hybridization","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 1-2 — clean KO with defined ultrastructural phenotype, replicated across multiple tissue types","pmids":["10873152"],"is_preprint":false},{"year":1997,"finding":"Recombinant HFH-4 (FOXJ1) protein binds DNA with consensus sequences HWDTGTTTGTTTA or KTTTGTTGTTKTW, identified by in vitro DNA-binding site selection. HFH-4 forms specific protein-DNA complexes with promoter regions of genes including prothrombin, beta-amyloid precursor protein, CFTR, and HNF-3alpha, and acts as a potent transcriptional activator in cotransfection assays.","method":"In vitro DNA-binding site selection with recombinant protein, EMSA, cotransfection transcriptional activation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro DNA binding with consensus sequence determination and functional validation by cotransfection","pmids":["9096351"],"is_preprint":false},{"year":2003,"finding":"In Foxj1-null airway epithelial cells, basal bodies form and cells commit to ciliogenesis, but basal bodies are disorganized in the apical compartment and fail to dock with the apical membrane. Reconstitution of Foxj1 in null cells restored normal basal body organization, resulting in axoneme growth, demonstrating Foxj1 functions specifically in late-stage ciliogenesis to regulate basal body docking and axoneme formation.","method":"Primary mouse airway epithelial cell culture, foxj1-null cells, gene delivery/reconstitution, ultrastructural analysis","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution experiment in null cells with functional rescue and ultrastructural readout","pmids":["12818891"],"is_preprint":false},{"year":2004,"finding":"Microarray analysis of Foxj1-null vs. wild-type pulmonary epithelium identified calpastatin (a calpain inhibitor) as a Foxj1 target; loss of Foxj1 decreased calpastatin expression, leading to increased calpain activity, degradation of ezrin, and failure of basal bodies to anchor to the apical cytoskeleton. Treatment of Foxj1-null tracheal explants with a calpain inhibitor partially restored cilia and relocalized ezrin and EBP-50, establishing a Foxj1→calpastatin→calpain→ezrin→basal body anchoring pathway.","method":"Microarray, RNase protection, immunohistochemistry, western blot, immunoelectron microscopy, pharmacological rescue with calpain inhibitor","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including pharmacological rescue and immunoelectron microscopy establishing mechanistic pathway","pmids":["14996907"],"is_preprint":false},{"year":2003,"finding":"Foxj1 expression is required for apical localization of ezrin (but not moesin) in airway epithelial cells. In Foxj1-null cells, membrane-cytoskeletal and threonine-phosphorylated ezrin are decreased, and ERM-associated EBP50 and beta2 adrenergic receptor fail to localize apically, demonstrating Foxj1 differentially regulates ERM proteins to organize multi-protein complexes at apical membranes of ciliated cells.","method":"Foxj1-null mouse airway epithelial cells, immunofluorescence, western blot, fractionation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined molecular phenotype using multiple methods","pmids":["14625387"],"is_preprint":false},{"year":2004,"finding":"Foxj1 suppresses NF-κB transcriptional activity in T cells. Foxj1-deficient T cells show increased NF-κB activity in vivo, and Foxj1 can regulate IκB proteins, particularly IκBβ. Loss of Foxj1 results in multiorgan systemic inflammation, exaggerated Th1 cytokine production, and T cell proliferation in autologous mixed lymphocyte reactions, establishing Foxj1 as an NF-κB repressor in T cells.","method":"Foxj1 knockout mice, in vitro NF-κB transcriptional assays, T cell functional assays, cytokine measurement","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with in vitro mechanistic follow-up showing NF-κB suppression and IκBβ regulation","pmids":["14963332"],"is_preprint":false},{"year":2007,"finding":"Foxj1 promotes RhoA and RhoB activation during ciliogenesis. Foxj1-null mice lack apical actin web formation and basal body docking, which are both rescued by RhoA activation. Foxj1 expression coincides with and is required for apical actin web formation essential for basal body docking, and Foxj1 also promotes apical ezrin localization via RhoA, placing Foxj1 upstream of RhoA in cytoskeletal remodeling during ciliogenesis.","method":"Primary mouse airway epithelial cell culture, Foxj1-null mice, actin perturbation assays, RhoA inhibition, immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — epistatic ordering of Foxj1 and RhoA with multiple functional readouts in null and pharmacological models","pmids":["17488776"],"is_preprint":false},{"year":2008,"finding":"Zebrafish foxj1a, a target of Hedgehog signaling in the floor plate, acts as a master regulator of motile cilia formation. Foxj1a loss compromises assembly of motile cilia in floor plate, Kupffer's vesicle, and pronephric ducts, and its ectopic expression is sufficient to induce ectopic development of motile cilia-like structures. A paralogous gene foxj1b regulates motile cilia in the otic vesicle.","method":"Zebrafish loss-of-function (morpholino), ectopic expression assays, epistasis with Hedgehog signaling","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function and gain-of-function in vivo with defined ciliary phenotype, corroborated by parallel study","pmids":["19011630"],"is_preprint":false},{"year":2008,"finding":"Xenopus and zebrafish Foxj1 is required for formation of motile cilia at the gastrocoel roof plate (GRP) and Kupffer's vesicle that underlie left-right patterning. Microarray analysis showed Foxj1 induces cilia formation by upregulating motile cilia gene expression. Misexpression of Foxj1 is sufficient to induce ectopic GRP-like cilia formation in frog embryos.","method":"Morpholino knockdown in Xenopus/zebrafish, ectopic expression, microarray transcriptional profiling","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — parallel study with two model organisms, loss- and gain-of-function plus transcriptome-wide target identification","pmids":["19011629"],"is_preprint":false},{"year":2007,"finding":"IL-13 treatment of differentiated human airway epithelium decreases foxj1 expression via a STAT6-binding element in the foxj1 promoter. STAT-6 and IL-13 inhibit foxj1 expression, resulting in loss of apical basal body localization, loss of ezrin from the apical compartment, and loss of ciliated cells, establishing an IL-13/STAT6→FOXJ1 regulatory axis in airway ciliogenesis.","method":"Human airway epithelial culture, IL-13 treatment, STAT6 inhibition, promoter analysis, immunofluorescence","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 — promoter element identified and functionally linked to ciliated cell loss via multiple methods","pmids":["17541011"],"is_preprint":false},{"year":2011,"finding":"Wnt/β-catenin signaling directly regulates foxj1a expression and ciliogenesis in zebrafish Kupffer's vesicle. Enhancer analysis identifies Lef1/Tcf binding sites required for KV-specific foxj1a expression. Wnt signaling reduction causes shorter/fewer cilia, loss of cilia motility, and LR patterning defects that are rescued by KV-targeted foxj1a overexpression, placing Wnt/β-catenin upstream of Foxj1 in the ciliogenic hierarchy. Epistasis with FGF pathway shows Wnt acts more downstream.","method":"Zebrafish genetic/pharmacological Wnt inhibition, enhancer/promoter analysis, morpholino, KV-targeted mRNA injection, epistasis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — epistatic rescue experiment with enhancer validation identifying direct transcriptional regulation","pmids":["22190638"],"is_preprint":false},{"year":2012,"finding":"Mouse Noto acts upstream of Foxj1 in the node; Foxj1 expressed from the Noto locus restores structurally normal motile cilia in Noto-null nodes. However, Foxj1 is not sufficient for correct posterior cilia positioning on node cells (a Noto-regulated event), and Foxj1 is essential for ciliogenesis in the node upstream of Rfx3, establishing the epistatic order Noto→Foxj1→Rfx3 in nodal ciliogenesis.","method":"Knock-in of Foxj1 cDNA into Noto locus, Foxj1-null mouse analysis, nodal cilia ultrastructure and flow analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — elegant knock-in rescue experiment with defined epistatic ordering","pmids":["22357932"],"is_preprint":false},{"year":2013,"finding":"FOXJ1 and RFX3 physically interact (co-immunoprecipitation) and cooperatively induce cilia gene expression in human airway basal cells. FOXJ1 transfection activates ciliated gene promoters and induces RFX3 expression; RFX3 alone cannot induce cilia genes. The combination of FOXJ1+RFX3 enhances ciliated gene promoter activity and mRNA expression beyond FOXJ1 alone, establishing RFX3 as a co-activator of FOXJ1.","method":"Human airway basal cell transfection, air-liquid interface differentiation, promoter assays, co-immunoprecipitation, TaqMan PCR","journal":"Respiratory research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal functional evidence with protein interaction confirmed by co-IP and multiple transcriptional readouts","pmids":["23822649"],"is_preprint":false},{"year":2016,"finding":"p73 directly regulates Foxj1 transcription in multiciliated cells. ChIP-seq in murine tracheal cells identifies Foxj1 as a direct p73 (and p63) target gene. Loss of p73 impairs MCC differentiation, causing hydrocephalus, hippocampal dysgenesis, sterility, and chronic airway inflammation, establishing p73 as an upstream transcriptional activator of Foxj1 in the multiciliogenesis program.","method":"p73 knockout mice, ChIP-seq, gene expression analysis, functional phenotypic characterization","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP-seq establishing direct binding combined with KO phenotype and validated target genes","pmids":["26947080"],"is_preprint":false},{"year":2021,"finding":"The m6A demethylase FTO stabilizes FOXJ1 mRNA by removing m6A modifications. FTO depletion leads to FOXJ1 mRNA destabilization and severe loss of ciliated cells in primary human airway epithelium, with increase in goblet cells. In Xenopus, Foxj1 is a phenocritical FTO target for motile ciliogenesis, establishing an FTO→FOXJ1 mRNA stability axis upstream of the ciliogenic program.","method":"FTO depletion in Xenopus (morpholino), human airway epithelium (siRNA/KD), mRNA stability assays, m6A analysis, Fto knockout mice","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1-2 — conserved mechanism demonstrated across three species with direct mRNA stability measurements","pmids":["33761320"],"is_preprint":false},{"year":2010,"finding":"Foxj1 expression in the neural tube (chick and mouse floor plate) is regulated by Shh signaling, is sufficient to increase cilia length in neuroepithelial cells when ectopically expressed, and attenuates intracellular Shh signaling by decreasing Gli protein activity in a cilia-dependent manner, establishing a feedback mechanism where Foxj1-induced cilia modulate Shh signal transduction.","method":"Chick electroporation, mouse Foxj1-null analysis, Shh signaling assays, ectopic expression in Shh-responsive cell line","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — gain-of-function, loss-of-function, and in vitro signaling assays with mechanistic pathway elucidation","pmids":["21098568"],"is_preprint":false},{"year":2005,"finding":"Foxj1 restrains B cell activation intrinsically by antagonizing NF-κB and its target IL-6. Foxj1 deficiency in B cells results in spontaneous and accentuated germinal center formation, pathogenic autoantibodies, and accentuated immunization responses, correlating with a requirement for Foxj1 to regulate the inhibitory NF-κB component IκBβ.","method":"Foxj1-deficient B cell analysis, NF-κB activity assays, germinal center formation, autoantibody detection","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 — KO with defined molecular mechanism (IκBβ regulation) and cellular phenotype","pmids":["16002694"],"is_preprint":false},{"year":2008,"finding":"PITX2 binds the FoxJ1 promoter (shown by chromatin immunoprecipitation) and activates FoxJ1 expression. Lef-1 and β-catenin interact with PITX2 to synergistically regulate the FoxJ1 promoter. FoxJ1 physically interacts with the PITX2 homeodomain to synergistically regulate FoxJ1 expression, providing a positive autoregulatory feedback mechanism. The ARS-associated PITX2 T68P mutant interacts with FoxJ1 but cannot activate the FoxJ1 promoter.","method":"Chromatin immunoprecipitation, cotransfection promoter assays, protein-protein interaction (co-IP/pulldown), PITX2 transgenic mouse fibroblasts","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP confirming promoter binding, co-IP for protein interaction, and functional promoter assays including mutant","pmids":["18723525"],"is_preprint":false},{"year":2019,"finding":"De novo heterozygous loss-of-function mutations in FOXJ1 cause an autosomal-dominant motile ciliopathy with hydrocephalus, chronic airway disease, and left/right body asymmetry randomization. Mutant respiratory epithelial cells have reduced cilia number per cell, impaired fluid flow, and mislocalized basal bodies. The focal adhesion protein PTK2 displays aberrant cytoplasmic localization in mutant cells.","method":"Whole-exome/genome sequencing, high-speed video microscopy, TEM, immunofluorescence in patient cells","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — human genetics with functional validation in patient cells using multiple methods","pmids":["31630787"],"is_preprint":false},{"year":2023,"finding":"Heterozygous disruption of one Foxj1 allele in mice leads to incomplete ependymal cell differentiation with decreased mature ependymal cell number, decreased motile cilia number, abnormal axonemes in 12% of cilia, decreased microtubule attachment to basal bodies, random localization and orientation of basal body patches, loss of planar cell polarity, and disruption of unidirectional CSF flow causing communicating hydrocephalus.","method":"Foxj1 heterozygous knockout mice, immunofluorescence, electron microscopy, CSF flow analysis","journal":"Cellular and molecular neurobiology","confidence":"High","confidence_rationale":"Tier 2 — clean heterozygous mouse KO with ultrastructural and functional ciliary readouts","pmids":["37620636"],"is_preprint":false},{"year":2005,"finding":"Foxj1 regulates thymic egress of T cells. CD2-Foxj1 transgenic mice exhibit peripheral T cell lymphopenia associated with accumulation of mature single-positive thymocytes. Transgenic thymocytes demonstrate impaired thymic exodus in response to CCL19, apparently independent of CCR7, S1P1, and NF-κB, demonstrating a role for Foxj1 in thymocyte egress.","method":"CD2-Foxj1 transgenic mice on MRL/lpr background, adoptive transfer, chemokine migration assays","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 — transgenic mouse with defined phenotype, but mechanism of egress regulation not fully elucidated","pmids":["16339515"],"is_preprint":false},{"year":2012,"finding":"In Xenopus, ATP4a is required for Wnt/β-catenin-regulated Foxj1 induction in the superficial mesoderm. Gene knockdown or pharmacological inhibition of ATP4 compromises organ situs, asymmetric marker gene expression, leftward flow, and Foxj1 expression. ATP4 acts upstream of Wnt/β-catenin→Foxj1 induction and Wnt/PCP-dependent cilia polarization in symmetry breaking.","method":"Xenopus morpholino knockdown, pharmacological inhibition, gene expression analysis, cilia analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — epistatic ordering in one model organism without direct mechanistic link between ATP4 and Wnt","pmids":["22832275"],"is_preprint":false},{"year":2014,"finding":"FOXJ1 overexpression prevents cigarette smoke extract (CSE)-mediated inhibition of cilia growth in human airway basal cell ALI cultures, partially reversing CSE-induced suppression of cilia-related genes involved in intraflagellar transport, motility, structural integrity, and basal body development.","method":"Human airway basal cell ALI cultures, lentiviral FOXJ1 overexpression, cilia length measurement, gene expression profiling","journal":"American journal of respiratory cell and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function rescue experiment with defined transcriptional and morphological readouts","pmids":["24828273"],"is_preprint":false},{"year":2004,"finding":"Estradiol (E2) induces Foxj1 expression in rat oviduct infundibulum/ampulla via estrogen receptor, and Foxj1 expression precedes cilia appearance. Foxj1-deficient mice completely lack oviductal cilia, demonstrating Foxj1 is directly required for oviductal ciliogenesis, while ERα signaling is not essential (ERα-deficient mice retain cilia).","method":"Rat oviduct organ culture with E2, ER antagonist, Foxj1-null and ERα-null mouse analysis, immunohistochemistry","journal":"Journal of molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — null mouse phenotype with epistatic dissection of ER vs Foxj1 requirement","pmids":["15171704"],"is_preprint":false},{"year":2023,"finding":"LRRC6 facilitates active nuclear translocation of FOXJ1. In Lrrc6 knockout mice, FOXJ1 is retained in the cytoplasm; LRRC6 expression promotes FOXJ1 nuclear translocation, which is blocked by INI-43 (an importin α inhibitor), suggesting an importin α-dependent nuclear import pathway for FOXJ1 regulated by LRRC6.","method":"Lrrc6 KO mice, immunofluorescence, pharmacological inhibition (INI-43), transcriptomic analysis of cilia genes","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse with pharmacological inhibition identifying importin α involvement, single lab","pmids":["37328841"],"is_preprint":false},{"year":2016,"finding":"Microarray screening of Foxj1-deficient vs. wild-type fetal mouse lungs and Noto-null embryos identified 326 candidate FOXJ1-dependent ciliogenesis-associated genes, including Cfap206, Cfap157, Fam183b, and 1700012B09Rik, providing the downstream genetic program of motile ciliogenesis regulated by FOXJ1 in mammalian tissues.","method":"Microarray of Foxj1-deficient and stage-matched fetal mouse lungs and node embryos, functional validation of selected targets","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — genome-wide transcriptional target identification with functional follow-up of selected targets","pmids":["27914912"],"is_preprint":false},{"year":2016,"finding":"CFAP157, a FOXJ1 target gene, encodes a protein localizing to basal bodies that interacts with tubulin and the centrosomal protein CEP350. Cfap157 knockout mice are male-infertile with flagellar axoneme defects including supernumerary axonemal profiles and ectopic accessory structures, establishing CFAP157 as a FOXJ1 effector required for spermiogenesis.","method":"Foxj1-dependent expression analysis, Cfap157 KO mice, protein-protein interaction (pulldown), immunofluorescence, electron microscopy","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse with ultrastructural phenotype and protein interaction data","pmids":["27965440"],"is_preprint":false},{"year":2020,"finding":"CFAP206, a FOXJ1 target gene, encodes a protein localizing to the basal body and axoneme of motile cilia. Cfap206 knockout mice show male infertility, hydrocephalus, and impaired mucociliary clearance. Electron tomography of knockout sperm flagella indicates a role in radial spoke formation, consistent with FAP206 function in Tetrahymena.","method":"Foxj1-dependent expression analysis, Cfap206 KO mice and Xenopus crispants, electron tomography, ciliary beat frequency measurement","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — KO mouse and Xenopus with ultrastructural and functional readouts","pmids":["32376681"],"is_preprint":false},{"year":2023,"finding":"A truncating FOXJ1 variant (p.Glu267Glyfs*12) fails to induce ectopic cilia in frog epidermis in vivo and fails to activate the ADGB promoter (a downstream FOXJ1 target) in transactivation assays, demonstrating loss of transcriptional transactivation function associated with congenital heart defects in a patient.","method":"Xenopus ectopic cilia assay, in vitro promoter transactivation, exome sequencing","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — functional in vivo and in vitro validation of patient variant, single study","pmids":["37158461"],"is_preprint":false},{"year":2024,"finding":"Recombinant FOXJ1 protein binds DNA at the FOX consensus sequence, forms cysteine-dependent higher-order oligomers via disulfide bridges, contains polyacidic gel-shifting domains at the N- and C-termini causing anomalous electrophoretic migration, and harbors intrinsically disordered regions.","method":"Recombinant protein expression, DNA-binding assay, DTT reduction of oligomers, SDS-PAGE anomalous migration analysis","journal":"Protein expression and purification","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro biochemical characterization, single study, novel findings on protein biochemistry","pmids":["39549898"],"is_preprint":false},{"year":2024,"finding":"In zebrafish and mice, Foxj1 is expressed in olfactory sensory neurons (OSNs) and is required for olfactory cilia biogenesis and for differentiation of OSNs themselves, including regulation of olfactory marker protein (omp) expression. Ciliary motility genes are repressed in OSNs despite Foxj1 expression, showing the motile ciliogenic program is repurposed for immotile olfactory cilia.","method":"Zebrafish Foxj1 mutants, mouse Foxj1 analysis, single-cell transcriptomics, odor response assays, in situ hybridization","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function in two vertebrate species with functional (olfactory response) and transcriptional readouts","pmids":["38271330"],"is_preprint":false},{"year":2026,"finding":"FOXJ1 overexpression in prostate cancer cells confers docetaxel resistance by decreasing docetaxel-mediated microtubule bundling, while FOXJ1 knockdown impairs basal microtubule function, enhances taxane binding to microtubules, and increases docetaxel sensitivity. TPPP3, a microtubule-associated FOXJ1-regulated gene, has similar effects on taxane resistance when overexpressed.","method":"Prostate cancer PDX in vivo models, FOXJ1 overexpression/knockdown in vitro and in vivo, microtubule bundling assays, taxane binding assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — bidirectional genetic manipulation (OE and KD) with mechanistic in vitro assays and in vivo validation","pmids":["41690905"],"is_preprint":false},{"year":2018,"finding":"FoxJ1 is required during embryonic spinal cord development for progenitor proliferation and cell fate determination, and FoxJ1 loss results in formation of adult ependymal cells with impaired stem cell potential and inability to respond to spinal cord injury.","method":"FoxJ1 fate-mapping mouse lines, FoxJ1 knock-in mice, spinal cord injury model, immunofluorescence, proliferation assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — KO and knock-in mice with defined developmental and injury-response phenotypes, single lab","pmids":["29689278"],"is_preprint":false},{"year":2013,"finding":"In Xenopus, foxj1 knockdown (morpholino) in the CNS causes absence of ependymal cilia, impaired CSF flow, and fourth ventricle hydrocephalus, establishing that motile ependymal cilia driven by Foxj1 are essential for CSF circulation and maintenance of homeostatic fluid pressure in the brain.","method":"Xenopus foxj1 morpholino knockdown, scanning electron microscopy, bead injection and video microscopy of CSF flow","journal":"Cilia","confidence":"Medium","confidence_rationale":"Tier 2 — morpholino KD with functional CSF flow readout, single model organism","pmids":["24229449"],"is_preprint":false},{"year":2005,"finding":"In Foxj1/inv double mutant mice, the random laterality phenotype of Foxj1 is dominant over the reversal-of-situs phenotype of inv, and right pulmonary isomerism (due to absent bilateral Pitx2 expression in lateral plate mesoderm) is a major phenotype of Foxj1-null mice. This epistatic analysis places Foxj1 upstream of Pitx2 in left-right axis determination.","method":"Double mutant mouse analysis (Foxj1 × inv), lung morphology, in situ hybridization for Pitx2","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in double mutant mouse, placing Foxj1 in LR pathway upstream of Pitx2","pmids":["16325766"],"is_preprint":false}],"current_model":"FOXJ1 is a forkhead transcription factor that acts as a master regulator of motile ciliogenesis by directly activating a transcriptional program of motile cilia genes (including targets like CFAP206, CFAP157, and calpastatin), is itself regulated upstream by p73, Wnt/β-catenin, Hedgehog signaling, PITX2, and FTO-mediated mRNA stabilization, controls basal body docking at the apical membrane via RhoA activation and the calpastatin-calpain-ezrin axis, physically interacts with RFX3 as a co-activator, requires LRRC6-mediated importin α-dependent nuclear translocation for activity, and additionally functions in immune cell homeostasis by antagonizing NF-κB activity through regulation of IκBβ in T and B cells."},"narrative":{"teleology":[{"year":1997,"claim":"Establishing that FOXJ1 is a sequence-specific DNA-binding transcriptional activator answered the fundamental question of how FOXJ1 functions molecularly — as a direct transcription factor rather than a cofactor or signaling molecule.","evidence":"In vitro DNA-binding site selection with recombinant protein, EMSA, and cotransfection activation assays","pmids":["9096351"],"confidence":"High","gaps":["Physiological target genes in vivo not yet identified","No structural information on the DNA-binding domain","Activator versus repressor activity context-dependent"]},{"year":2000,"claim":"The Foxj1 knockout mouse revealed that FOXJ1 is essential specifically for motile (9+2) ciliogenesis but dispensable for sensory (9+0) cilia, and that the defect lies in basal body migration and apical docking rather than basal body formation per se.","evidence":"Targeted gene knockout in mice with electron microscopy across airway, ependyma, and oviduct","pmids":["10873152"],"confidence":"High","gaps":["Molecular targets mediating basal body docking unknown","Whether Foxj1 is sufficient for cilia formation untested"]},{"year":2003,"claim":"Reconstitution of Foxj1 in null airway cells rescued basal body docking and axoneme growth, establishing that Foxj1 functions cell-autonomously at a late stage of ciliogenesis and is both necessary and sufficient for basal body anchoring in committed ciliated precursors.","evidence":"Gene delivery and reconstitution in Foxj1-null primary mouse airway epithelial cells with ultrastructural analysis","pmids":["12818891"],"confidence":"High","gaps":["Downstream effector genes mediating rescue not identified","Whether Foxj1 acts alone or requires cofactors unknown"]},{"year":2004,"claim":"Identification of the Foxj1→calpastatin→calpain→ezrin pathway revealed the first molecular mechanism linking FOXJ1 transcriptional activity to cytoskeletal remodeling required for basal body anchoring at the apical membrane.","evidence":"Microarray of Foxj1-null lung, immunoelectron microscopy, and pharmacological rescue with calpain inhibitor in tracheal explants","pmids":["14996907","14625387"],"confidence":"High","gaps":["Whether calpastatin is a direct transcriptional target not confirmed by ChIP","Only partial rescue by calpain inhibition suggests additional pathways"]},{"year":2004,"claim":"Discovery that FOXJ1 suppresses NF-κB via IκBβ in T cells, with Foxj1-null mice developing systemic inflammation and autoimmunity, revealed a non-ciliary immune-regulatory function for FOXJ1 and broadened its biological role beyond epithelial ciliogenesis.","evidence":"Foxj1 knockout mice with NF-κB transcriptional assays, T cell and B cell functional assays","pmids":["14963332","16002694"],"confidence":"High","gaps":["Whether IκBβ is a direct transcriptional target of FOXJ1 not shown","Mechanism of NF-κB antagonism (transcriptional vs. protein-level) not fully resolved","Relevance to human immune disease unknown"]},{"year":2007,"claim":"Placing FOXJ1 upstream of RhoA activation and apical actin web formation established a second effector pathway by which FOXJ1 remodels the apical cytoskeleton for basal body docking, complementing the calpastatin–ezrin axis.","evidence":"Foxj1-null primary airway cells with RhoA activity assays and pharmacological/genetic rescue","pmids":["17488776"],"confidence":"High","gaps":["Whether FOXJ1 activates a Rho-GEF transcriptionally or acts through another mechanism unknown","Relationship between RhoA and calpastatin pathways not clarified"]},{"year":2008,"claim":"Studies in zebrafish and Xenopus demonstrated that Foxj1 is both necessary and sufficient for motile cilia formation in left-right organizer structures and is a downstream target of Hedgehog, Wnt/β-catenin, and PITX2 signaling, establishing the upstream regulatory hierarchy controlling Foxj1 expression.","evidence":"Morpholino knockdown and ectopic expression in zebrafish/Xenopus; ChIP and promoter assays for PITX2 binding; epistasis with Hedgehog and Wnt","pmids":["19011630","19011629","18723525","22190638"],"confidence":"High","gaps":["Integration of multiple upstream inputs (Shh, Wnt, PITX2) at the Foxj1 promoter not resolved","Whether all upstream pathways are conserved in mammals not fully tested"]},{"year":2010,"claim":"The finding that Foxj1-induced cilia attenuate Shh signaling by reducing Gli activity established a negative feedback loop where Foxj1, itself a Shh target, modulates the very pathway that activates it.","evidence":"Chick electroporation, mouse Foxj1-null analysis, and Shh signaling assays in cell lines","pmids":["21098568"],"confidence":"High","gaps":["Mechanism by which cilia length increase attenuates Gli activity not molecularly defined","Generality across tissues beyond floor plate not established"]},{"year":2012,"claim":"Knock-in of Foxj1 into the Noto locus rescued nodal cilia structure but not posterior positioning, establishing the epistatic hierarchy Noto→Foxj1→Rfx3 and distinguishing FOXJ1's role in cilia assembly from planar cell polarity.","evidence":"Foxj1 cDNA knock-in into Noto locus in mouse, nodal cilia ultrastructure and flow analysis","pmids":["22357932"],"confidence":"High","gaps":["How Noto activates Foxj1 transcription not defined","Whether Rfx3 is a direct Foxj1 target not shown by ChIP at this locus"]},{"year":2013,"claim":"Demonstration that FOXJ1 and RFX3 physically interact and cooperatively activate cilia gene promoters resolved how FOXJ1 achieves target gene specificity and transcriptional potency during multiciliogenesis.","evidence":"Co-immunoprecipitation, promoter assays, and gene expression analysis in human airway basal cells","pmids":["23822649"],"confidence":"High","gaps":["Structural basis of FOXJ1–RFX3 interaction unknown","Genome-wide co-occupancy not mapped"]},{"year":2016,"claim":"ChIP-seq identification of Foxj1 as a direct p73 target in multiciliated cells, combined with genome-wide identification of ~326 FOXJ1-dependent ciliogenesis genes including CFAP206 and CFAP157, defined both the upstream activator and the downstream transcriptional program of FOXJ1.","evidence":"p73 ChIP-seq in murine tracheal cells; microarray of Foxj1-null fetal lungs and Noto-null embryos; KO mouse validation of CFAP targets","pmids":["26947080","27914912","27965440"],"confidence":"High","gaps":["Which of the 326 genes are direct versus indirect FOXJ1 targets not resolved genome-wide","Functional hierarchy among FOXJ1 target genes not established"]},{"year":2019,"claim":"Identification of heterozygous FOXJ1 loss-of-function mutations as the cause of an autosomal-dominant motile ciliopathy in humans translated the mouse phenotype to clinical genetics, confirming haploinsufficiency as disease mechanism.","evidence":"Whole-exome/genome sequencing of patient cohort with functional validation in patient respiratory epithelial cells","pmids":["31630787"],"confidence":"High","gaps":["Genotype-phenotype correlation across different FOXJ1 mutations incomplete","Whether PTK2 mislocalization is mechanistically causal or secondary unknown"]},{"year":2021,"claim":"Discovery that FTO stabilizes FOXJ1 mRNA through m6A demethylation revealed a post-transcriptional regulatory layer controlling FOXJ1 abundance, upstream of and independent from transcriptional regulation.","evidence":"FTO depletion in human airway epithelium and Xenopus with mRNA stability and m6A measurements; Fto knockout mice","pmids":["33761320"],"confidence":"High","gaps":["Specific m6A sites on FOXJ1 mRNA responsible for destabilization not mapped","Which m6A reader mediates FOXJ1 mRNA decay unknown"]},{"year":2023,"claim":"Demonstration that LRRC6 facilitates importin-α-dependent nuclear translocation of FOXJ1 resolved a long-standing question of how cytoplasmic FOXJ1 protein accesses the nucleus to activate its target genes.","evidence":"Lrrc6 KO mice showing cytoplasmic FOXJ1 retention; pharmacological blockade with importin-α inhibitor INI-43","pmids":["37328841"],"confidence":"Medium","gaps":["Direct LRRC6–FOXJ1 physical interaction not demonstrated","Whether LRRC6 acts as an adaptor or modifies FOXJ1 for importin recognition unknown","Single laboratory finding"]},{"year":2024,"claim":"Extension of Foxj1 function to olfactory sensory neuron differentiation and immotile olfactory cilia biogenesis showed that the FOXJ1 ciliogenic program is modularly repurposed, with motile cilia genes actively repressed in this context.","evidence":"Foxj1 mutant zebrafish and mouse with single-cell transcriptomics and olfactory functional assays","pmids":["38271330"],"confidence":"High","gaps":["Mechanism of selective repression of motility genes in OSNs unknown","Which co-factors specify the immotile versus motile program in FOXJ1-expressing cells not identified"]},{"year":null,"claim":"Key unresolved questions include the structural basis of FOXJ1 DNA binding and oligomerization, genome-wide discrimination of direct versus indirect targets, how FOXJ1 integrates multiple upstream signals at its promoter, and how the motile versus immotile cilia program is differentially specified in FOXJ1-expressing cells.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of FOXJ1 or FOXJ1–DNA complex","Genome-wide ChIP-seq for FOXJ1 itself not reported","Mechanism selecting motile versus immotile cilia gene sets unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,29]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,3,5,7,8,12,25,28,31]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,12,24]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,2,7,8,11,19,27]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,3,12,13,25]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,16,20]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,15,17]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,34]}],"complexes":[],"partners":["RFX3","PITX2","LRRC6","LEF1"],"other_free_text":[]},"mechanistic_narrative":"FOXJ1 is a forkhead-family transcription factor that serves as a master regulator of motile ciliogenesis across vertebrate tissues, controlling basal body docking, apical membrane organization, and axoneme assembly. FOXJ1 binds FOX consensus DNA sequences as a transcriptional activator, directly inducing a program of hundreds of cilia-associated genes (including CFAP206, CFAP157, and calpastatin), and cooperates with the co-activator RFX3 to enhance ciliated gene expression [PMID:9096351, PMID:12818891, PMID:23822649, PMID:27914912]. Mechanistically, FOXJ1 promotes basal body anchoring through a calpastatin–calpain–ezrin pathway and RhoA-dependent apical actin web formation, and its nuclear translocation requires LRRC6-mediated importin-α-dependent import; upstream, FOXJ1 transcription and mRNA stability are regulated by p73, Wnt/β-catenin, Hedgehog/Shh, PITX2, IL-13/STAT6, and FTO-mediated m6A demethylation [PMID:14996907, PMID:17488776, PMID:37328841, PMID:26947080, PMID:22190638, PMID:33761320]. Heterozygous loss-of-function mutations in FOXJ1 cause an autosomal-dominant motile ciliopathy featuring hydrocephalus, chronic airway disease, and laterality defects, and FOXJ1 additionally functions outside ciliated epithelia to antagonize NF-κB via IκBβ regulation in T and B cells [PMID:31630787, PMID:14963332, PMID:16002694]."},"prefetch_data":{"uniprot":{"accession":"Q92949","full_name":"Forkhead box protein J1","aliases":["Forkhead-related protein FKHL13","Hepatocyte nuclear factor 3 forkhead homolog 4","HFH-4"],"length_aa":421,"mass_kda":45.2,"function":"Transcription factor specifically required for the formation of motile cilia (PubMed:31630787). Acts by activating transcription of genes that mediate assembly of motile cilia, such as CFAP157. Binds the DNA consensus sequences 5'-HWDTGTTTGTTTA-3' or 5'-KTTTGTTGTTKTW-3' (where H is not G, W is A or T, D is not C, and K is G or T). Activates the transcription of a variety of ciliary proteins in the developing brain and lung","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q92949/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FOXJ1","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FOXJ1","total_profiled":1310},"omim":[{"mim_id":"621392","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 157; CFAP157","url":"https://www.omim.org/entry/621392"},{"mim_id":"621378","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 161; CFAP161","url":"https://www.omim.org/entry/621378"},{"mim_id":"621376","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 206; CFAP206","url":"https://www.omim.org/entry/621376"},{"mim_id":"620496","title":"BASAL BODY ORIENTATION FACTOR 1; BBOF1","url":"https://www.omim.org/entry/620496"},{"mim_id":"619502","title":"SPERM MICROTUBULE INNER PROTEIN 6; SPMIP6","url":"https://www.omim.org/entry/619502"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":70.2},{"tissue":"fallopian tube","ntpm":50.0}],"url":"https://www.proteinatlas.org/search/FOXJ1"},"hgnc":{"alias_symbol":["HFH-4","HFH4"],"prev_symbol":["FKHL13"]},"alphafold":{"accession":"Q92949","domains":[{"cath_id":"1.10.10.10","chopping":"125-209","consensus_level":"high","plddt":92.2586,"start":125,"end":209}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92949","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92949-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92949-F1-predicted_aligned_error_v6.png","plddt_mean":58.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FOXJ1","jax_strain_url":"https://www.jax.org/strain/search?query=FOXJ1"},"sequence":{"accession":"Q92949","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92949.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92949/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92949"}},"corpus_meta":[{"pmid":"19011630","id":"PMC_19011630","title":"Foxj1 transcription factors are master regulators of the motile ciliogenic program.","date":"2008","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19011630","citation_count":376,"is_preprint":false},{"pmid":"10873152","id":"PMC_10873152","title":"Ciliogenesis and left-right axis defects in forkhead factor HFH-4-null mice.","date":"2000","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10873152","citation_count":289,"is_preprint":false},{"pmid":"19011629","id":"PMC_19011629","title":"The forkhead protein Foxj1 specifies node-like cilia in Xenopus and zebrafish embryos.","date":"2008","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19011629","citation_count":268,"is_preprint":false},{"pmid":"12818891","id":"PMC_12818891","title":"Role of f-box factor foxj1 in differentiation of ciliated airway epithelial cells.","date":"2003","source":"American journal of physiology. Lung cellular and molecular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/12818891","citation_count":172,"is_preprint":false},{"pmid":"17488776","id":"PMC_17488776","title":"RhoA-mediated apical actin enrichment is required for ciliogenesis and promoted by Foxj1.","date":"2007","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/17488776","citation_count":171,"is_preprint":false},{"pmid":"31630787","id":"PMC_31630787","title":"De Novo Mutations in FOXJ1 Result in a Motile Ciliopathy with Hydrocephalus and Randomization of Left/Right Body Asymmetry.","date":"2019","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31630787","citation_count":156,"is_preprint":false},{"pmid":"22945654","id":"PMC_22945654","title":"Stem cell transcription factor NANOG controls cell migration and invasion via dysregulation of E-cadherin and FoxJ1 and contributes to adverse clinical outcome in ovarian cancers.","date":"2012","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/22945654","citation_count":138,"is_preprint":false},{"pmid":"10423398","id":"PMC_10423398","title":"Forkhead transcription factor HFH-4 expression is temporally related to ciliogenesis.","date":"1999","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10423398","citation_count":130,"is_preprint":false},{"pmid":"26947080","id":"PMC_26947080","title":"p73 Is Required for Multiciliogenesis and Regulates the Foxj1-Associated Gene Network.","date":"2016","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/26947080","citation_count":123,"is_preprint":false},{"pmid":"14996907","id":"PMC_14996907","title":"Foxj1 regulates basal body anchoring to the cytoskeleton of ciliated pulmonary epithelial cells.","date":"2004","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/14996907","citation_count":117,"is_preprint":false},{"pmid":"14963332","id":"PMC_14963332","title":"Modulation of Th1 activation and inflammation by the NF-kappaB repressor Foxj1.","date":"2004","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/14963332","citation_count":111,"is_preprint":false},{"pmid":"22190638","id":"PMC_22190638","title":"Wnt/β-catenin signaling directly regulates Foxj1 expression and ciliogenesis in zebrafish Kupffer's vesicle.","date":"2011","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/22190638","citation_count":106,"is_preprint":false},{"pmid":"9096351","id":"PMC_9096351","title":"The winged helix transcription factor HFH-4 is expressed during choroid plexus epithelial development in the mouse embryo.","date":"1997","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9096351","citation_count":89,"is_preprint":false},{"pmid":"14625387","id":"PMC_14625387","title":"Foxj1 is required for apical localization of ezrin in airway epithelial cells.","date":"2003","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/14625387","citation_count":83,"is_preprint":false},{"pmid":"21098568","id":"PMC_21098568","title":"Foxj1 regulates floor plate cilia architecture and modifies the response of cells to sonic hedgehog signalling.","date":"2010","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/21098568","citation_count":82,"is_preprint":false},{"pmid":"17541011","id":"PMC_17541011","title":"IL-13 regulates cilia loss and foxj1 expression in human airway epithelium.","date":"2007","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17541011","citation_count":79,"is_preprint":false},{"pmid":"23822649","id":"PMC_23822649","title":"RFX3 modulation of FOXJ1 regulation of cilia genes in the human airway epithelium.","date":"2013","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/23822649","citation_count":78,"is_preprint":false},{"pmid":"17255554","id":"PMC_17255554","title":"A transgenic FOXJ1-Cre system for gene inactivation in ciliated epithelial cells.","date":"2007","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17255554","citation_count":74,"is_preprint":false},{"pmid":"22832275","id":"PMC_22832275","title":"ATP4a is required for Wnt-dependent Foxj1 expression and leftward flow in Xenopus left-right development.","date":"2012","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/22832275","citation_count":73,"is_preprint":false},{"pmid":"24828273","id":"PMC_24828273","title":"FOXJ1 prevents cilia growth inhibition by cigarette smoke in human airway epithelium in vitro.","date":"2014","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/24828273","citation_count":73,"is_preprint":false},{"pmid":"10330459","id":"PMC_10330459","title":"HNF-3/forkhead homologue-4 (HFH-4) is expressed in ciliated epithelial cells in the developing mouse lung.","date":"1999","source":"The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society","url":"https://pubmed.ncbi.nlm.nih.gov/10330459","citation_count":72,"is_preprint":false},{"pmid":"11733356","id":"PMC_11733356","title":"Effects of paramyxoviral infection on airway epithelial cell Foxj1 expression, ciliogenesis, and mucociliary function.","date":"2001","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/11733356","citation_count":72,"is_preprint":false},{"pmid":"20539013","id":"PMC_20539013","title":"Goblet cells are derived from a FOXJ1-expressing progenitor in a human airway epithelium.","date":"2010","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/20539013","citation_count":64,"is_preprint":false},{"pmid":"15171704","id":"PMC_15171704","title":"Role of foxj1 and estrogen receptor alpha in ciliated epithelial cell differentiation of the neonatal oviduct.","date":"2004","source":"Journal of molecular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/15171704","citation_count":58,"is_preprint":false},{"pmid":"24229449","id":"PMC_24229449","title":"Ciliogenesis and cerebrospinal fluid flow in the developing Xenopus brain are regulated by foxj1.","date":"2013","source":"Cilia","url":"https://pubmed.ncbi.nlm.nih.gov/24229449","citation_count":49,"is_preprint":false},{"pmid":"23144623","id":"PMC_23144623","title":"Evolutionarily ancient association of the FoxJ1 transcription factor with the motile ciliogenic program.","date":"2012","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/23144623","citation_count":48,"is_preprint":false},{"pmid":"21697387","id":"PMC_21697387","title":"Specification of a Foxj1-dependent lineage in the forebrain is required for embryonic-to-postnatal transition of neurogenesis in the olfactory bulb.","date":"2011","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/21697387","citation_count":46,"is_preprint":false},{"pmid":"22357932","id":"PMC_22357932","title":"Differential regulation of node formation, nodal ciliogenesis and cilia positioning by Noto and Foxj1.","date":"2012","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/22357932","citation_count":42,"is_preprint":false},{"pmid":"17051618","id":"PMC_17051618","title":"The negative regulators Foxj1 and Foxo3a are up-regulated by a peptide that inhibits systemic lupus erythematosus-associated T cell responses.","date":"2006","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/17051618","citation_count":39,"is_preprint":false},{"pmid":"33761320","id":"PMC_33761320","title":"RNA demethylation by FTO stabilizes the FOXJ1 mRNA for proper motile ciliogenesis.","date":"2021","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/33761320","citation_count":35,"is_preprint":false},{"pmid":"9073514","id":"PMC_9073514","title":"The human hepatocyte nuclear factor 3/fork head gene FKHL13: genomic structure and pattern of expression.","date":"1997","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/9073514","citation_count":35,"is_preprint":false},{"pmid":"27914912","id":"PMC_27914912","title":"Identification of FOXJ1 effectors during ciliogenesis in the foetal respiratory epithelium and embryonic left-right organiser of the mouse.","date":"2016","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/27914912","citation_count":34,"is_preprint":false},{"pmid":"30881373","id":"PMC_30881373","title":"Identification of Important Effector Proteins in the FOXJ1 Transcriptional Network Associated With Ciliogenesis and Ciliary Function.","date":"2019","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30881373","citation_count":33,"is_preprint":false},{"pmid":"26690880","id":"PMC_26690880","title":"Decreased FOXJ1 expression and its ciliogenesis programme in aggressive ependymoma and choroid plexus tumours.","date":"2016","source":"The Journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26690880","citation_count":32,"is_preprint":false},{"pmid":"14986136","id":"PMC_14986136","title":"Isolation and developmental expression of Xenopus FoxJ1 and FoxK1.","date":"2004","source":"Development genes and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/14986136","citation_count":31,"is_preprint":false},{"pmid":"18723525","id":"PMC_18723525","title":"Novel expression and transcriptional regulation of FoxJ1 during oro-facial morphogenesis.","date":"2008","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18723525","citation_count":28,"is_preprint":false},{"pmid":"16461016","id":"PMC_16461016","title":"Developmental expression of FoxJ1.2, FoxJ2, and FoxQ1 in Xenopus tropicalis.","date":"2006","source":"Gene expression patterns : GEP","url":"https://pubmed.ncbi.nlm.nih.gov/16461016","citation_count":25,"is_preprint":false},{"pmid":"29689278","id":"PMC_29689278","title":"FoxJ1 regulates spinal cord development and is required for the maintenance of spinal cord stem cell potential.","date":"2018","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/29689278","citation_count":25,"is_preprint":false},{"pmid":"16002694","id":"PMC_16002694","title":"Restraint of B cell activation by Foxj1-mediated antagonism of NF-kappa B and IL-6.","date":"2005","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/16002694","citation_count":25,"is_preprint":false},{"pmid":"11060460","id":"PMC_11060460","title":"No deleterious mutations in the FOXJ1 (alias HFH-4) gene in patients with primary ciliary dyskinesia (PCD).","date":"2000","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11060460","citation_count":25,"is_preprint":false},{"pmid":"16339515","id":"PMC_16339515","title":"Cutting edge: Foxj1 protects against autoimmunity and inhibits thymocyte egress.","date":"2005","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/16339515","citation_count":24,"is_preprint":false},{"pmid":"29129693","id":"PMC_29129693","title":"FOXJ1 promotes bladder cancer cell growth and regulates Warburg effect.","date":"2017","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/29129693","citation_count":23,"is_preprint":false},{"pmid":"29379049","id":"PMC_29379049","title":"Foxj1 expressing ependymal cells do not contribute new cells to sites of injury or stroke in the mouse forebrain.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/29379049","citation_count":23,"is_preprint":false},{"pmid":"18956329","id":"PMC_18956329","title":"Isolation and expression analysis of foxj1 and foxj1.2 in zebrafish embryos.","date":"2008","source":"The International journal of developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/18956329","citation_count":23,"is_preprint":false},{"pmid":"32376681","id":"PMC_32376681","title":"The FOXJ1 target Cfap206 is required for sperm motility, mucociliary clearance of the airways and brain development.","date":"2020","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/32376681","citation_count":22,"is_preprint":false},{"pmid":"16518568","id":"PMC_16518568","title":"Identification of single nucleotide polymorphisms in FOXJ1 and their association with allergic rhinitis.","date":"2006","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16518568","citation_count":21,"is_preprint":false},{"pmid":"27965440","id":"PMC_27965440","title":"CFAP157 is a murine downstream effector of FOXJ1 that is specifically required for flagellum morphogenesis and sperm motility.","date":"2016","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/27965440","citation_count":21,"is_preprint":false},{"pmid":"35513267","id":"PMC_35513267","title":"FoxJ1 inhibits African swine fever virus replication and viral S273R protein decreases the expression of FoxJ1 to impair its antiviral effect.","date":"2022","source":"Virologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/35513267","citation_count":21,"is_preprint":false},{"pmid":"9367675","id":"PMC_9367675","title":"Structural characterization of the mouse Hfh4 gene, a developmentally regulated forkhead family member.","date":"1997","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/9367675","citation_count":20,"is_preprint":false},{"pmid":"30228229","id":"PMC_30228229","title":"A Subpopulation of Foxj1-Expressing, Nonmyelinating Schwann Cells of the Peripheral Nervous System Contribute to Schwann Cell Remyelination in the Central Nervous System.","date":"2018","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/30228229","citation_count":20,"is_preprint":false},{"pmid":"16325766","id":"PMC_16325766","title":"Roles of the Foxj1 and Inv genes in the left-right determination of internal organs in mice.","date":"2005","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/16325766","citation_count":19,"is_preprint":false},{"pmid":"37620636","id":"PMC_37620636","title":"Heterozygous FOXJ1 Mutations Cause Incomplete Ependymal Cell Differentiation and Communicating Hydrocephalus.","date":"2023","source":"Cellular and molecular neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/37620636","citation_count":18,"is_preprint":false},{"pmid":"18160851","id":"PMC_18160851","title":"Association of FOXJ1 polymorphisms with systemic lupus erythematosus and rheumatoid arthritis in Korean population.","date":"2007","source":"Experimental & molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/18160851","citation_count":18,"is_preprint":false},{"pmid":"28209947","id":"PMC_28209947","title":"Forkhead Box Protein J1 (FOXJ1) is Overexpressed in Colorectal Cancer and Promotes Nuclear Translocation of β-Catenin in SW620 Cells.","date":"2017","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/28209947","citation_count":17,"is_preprint":false},{"pmid":"38271330","id":"PMC_38271330","title":"The forkhead transcription factor Foxj1 controls vertebrate olfactory cilia biogenesis and sensory neuron differentiation.","date":"2024","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/38271330","citation_count":16,"is_preprint":false},{"pmid":"18258850","id":"PMC_18258850","title":"Murine cytomegalovirus influences Foxj1 expression, ciliogenesis, and mucus plugging in mice with allergic airway disease.","date":"2008","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/18258850","citation_count":15,"is_preprint":false},{"pmid":"24075965","id":"PMC_24075965","title":"FoxJ1-expressing cells contribute to neurogenesis in forebrain of adult rats: evidence from in vivo electroporation combined with piggyBac transposon.","date":"2013","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/24075965","citation_count":14,"is_preprint":false},{"pmid":"15912575","id":"PMC_15912575","title":"Aberrant expression of TTF-1 and forkhead factor HFH-4 in atrophic gastritis and ciliated metaplasia suggests gastric broncho-pulmonary transdetermination.","date":"2005","source":"The Journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15912575","citation_count":13,"is_preprint":false},{"pmid":"37158461","id":"PMC_37158461","title":"Congenital heart defects caused by FOXJ1.","date":"2023","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37158461","citation_count":12,"is_preprint":false},{"pmid":"30279523","id":"PMC_30279523","title":"The evolutionary conserved FOXJ1 target gene Fam183b is essential for motile cilia in Xenopus but dispensable for ciliary function in mice.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/30279523","citation_count":12,"is_preprint":false},{"pmid":"28719464","id":"PMC_28719464","title":"Nuclear CRX and FOXJ1 Expression Differentiates Non-Germ Cell Pineal Region Tumors and Supports the Ependymal Differentiation of Papillary Tumor of the Pineal Region.","date":"2017","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/28719464","citation_count":11,"is_preprint":false},{"pmid":"32711573","id":"PMC_32711573","title":"miR-200a contributes to the migration of BMSCs induced by the secretions of E. faecalis via FOXJ1/NFκB/MMPs axis.","date":"2020","source":"Stem cell research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/32711573","citation_count":10,"is_preprint":false},{"pmid":"30459817","id":"PMC_30459817","title":"Aberrant localization of FOXJ1 correlates with the disease severity and comorbidities in patients with nasal polyps.","date":"2018","source":"Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/30459817","citation_count":9,"is_preprint":false},{"pmid":"27660208","id":"PMC_27660208","title":"Expression and localization of forkhead box protein FOXJ1 in S100β-positive multiciliated cells of the rat pituitary.","date":"2016","source":"Medical molecular morphology","url":"https://pubmed.ncbi.nlm.nih.gov/27660208","citation_count":9,"is_preprint":false},{"pmid":"28952222","id":"PMC_28952222","title":"Significance of the detection of TIM-3 and FOXJ1 in prostate cancer.","date":"2017","source":"Journal of B.U.ON. : official journal of the Balkan Union of Oncology","url":"https://pubmed.ncbi.nlm.nih.gov/28952222","citation_count":8,"is_preprint":false},{"pmid":"37328841","id":"PMC_37328841","title":"LRRC6 regulates biogenesis of motile cilia by aiding FOXJ1 translocation into the nucleus.","date":"2023","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/37328841","citation_count":7,"is_preprint":false},{"pmid":"37329342","id":"PMC_37329342","title":"Persistence of FoxJ1+ Pax6+ Sox2+ ependymal cells throughout life in the human spinal cord.","date":"2023","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/37329342","citation_count":7,"is_preprint":false},{"pmid":"34172766","id":"PMC_34172766","title":"The highly conserved FOXJ1 target CFAP161 is dispensable for motile ciliary function in mouse and Xenopus.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/34172766","citation_count":7,"is_preprint":false},{"pmid":"31062413","id":"PMC_31062413","title":"Knockdown of FOXJ1 inhibits the proliferation, migration, invasion, and glycolysis in laryngeal squamous cell carcinoma cells.","date":"2019","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/31062413","citation_count":7,"is_preprint":false},{"pmid":"21347518","id":"PMC_21347518","title":"Increased expression of Foxj1 after traumatic brain injury.","date":"2011","source":"Journal of molecular neuroscience : MN","url":"https://pubmed.ncbi.nlm.nih.gov/21347518","citation_count":6,"is_preprint":false},{"pmid":"33015064","id":"PMC_33015064","title":"Consecutive Hypoxia Decreases Expression of NOTCH3, HEY1, CC10, and FOXJ1 via NKX2-1 Downregulation and Intermittent Hypoxia-Reoxygenation Increases Expression of BMP4, NOTCH1, MKI67, OCT4, and MUC5AC via HIF1A Upregulation in Human Bronchial Epithelial Cells.","date":"2020","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/33015064","citation_count":6,"is_preprint":false},{"pmid":"36929635","id":"PMC_36929635","title":"Down-expression of Foxj1 on airway epithelium with impaired cilia architecture in non-cystic fibrosis bronchiectasis implies disease severity.","date":"2023","source":"The clinical respiratory journal","url":"https://pubmed.ncbi.nlm.nih.gov/36929635","citation_count":5,"is_preprint":false},{"pmid":"36041223","id":"PMC_36041223","title":"Conditionally reprogrammed asthmatic bronchial epithelial cells express lower FOXJ1 at terminal differentiation and lower IFNs following RV-A1 infection.","date":"2022","source":"American journal of physiology. Lung cellular and molecular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/36041223","citation_count":5,"is_preprint":false},{"pmid":"28666954","id":"PMC_28666954","title":"1700012B09Rik, a FOXJ1 effector gene active in ciliated tissues of the mouse but not essential for motile ciliogenesis.","date":"2017","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/28666954","citation_count":5,"is_preprint":false},{"pmid":"37813609","id":"PMC_37813609","title":"FOXJ1 Variants Causing Primary Ciliary Dyskinesia with Hydrocephalus: A Case Report from Japan.","date":"2023","source":"Internal medicine (Tokyo, Japan)","url":"https://pubmed.ncbi.nlm.nih.gov/37813609","citation_count":5,"is_preprint":false},{"pmid":"37469238","id":"PMC_37469238","title":"A novel heterozygous variant of FOXJ1 in a Chinese female with primary ciliary dyskinesia and hydrocephalus: A case report and literature review.","date":"2023","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37469238","citation_count":4,"is_preprint":false},{"pmid":"23515839","id":"PMC_23515839","title":"Changes in the Foxj1 expression of Schwann cells after sciatic nerve crush.","date":"2013","source":"Journal of molecular histology","url":"https://pubmed.ncbi.nlm.nih.gov/23515839","citation_count":4,"is_preprint":false},{"pmid":"37856015","id":"PMC_37856015","title":"Combination of CRISPR-Cas9-RNP and Single-Cell RNAseq to Identify Cell State-Specific FOXJ1 Functions in the Human Airway Epithelium.","date":"2024","source":"Methods in molecular biology (Clifton, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/37856015","citation_count":4,"is_preprint":false},{"pmid":"35326483","id":"PMC_35326483","title":"Ciliated (FOXJ1+) Cells Display Reduced Ferritin Light Chain in the Airways of Idiopathic Pulmonary Fibrosis Patients.","date":"2022","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/35326483","citation_count":3,"is_preprint":false},{"pmid":"37692537","id":"PMC_37692537","title":"Novel dominant-negative FOXJ1 mutation in a family with heterotaxy plus mouse model.","date":"2023","source":"Translational pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/37692537","citation_count":2,"is_preprint":false},{"pmid":"23603178","id":"PMC_23603178","title":"The expression of FOXJ1 in neurogenesis after transient focal cerebral ischemia.","date":"2013","source":"The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques","url":"https://pubmed.ncbi.nlm.nih.gov/23603178","citation_count":2,"is_preprint":false},{"pmid":"38820864","id":"PMC_38820864","title":"Generation of FOXJ1-EGFP knock-in reporter human embryonic stem cell line, WAe001-A-2D, using CRISPR/Cas9-based gene targeting.","date":"2024","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/38820864","citation_count":0,"is_preprint":false},{"pmid":"40500042","id":"PMC_40500042","title":"FOXJ1 contributes to the resistance of Rhopalosiphum padi to pyrethroids by modulating the expression of P450 genes.","date":"2025","source":"Pesticide biochemistry and physiology","url":"https://pubmed.ncbi.nlm.nih.gov/40500042","citation_count":0,"is_preprint":false},{"pmid":"39549898","id":"PMC_39549898","title":"Recombinant human FOXJ1 protein binds DNA, forms higher-order oligomers, has gel-shifting domains and contains intrinsically disordered regions.","date":"2024","source":"Protein expression and purification","url":"https://pubmed.ncbi.nlm.nih.gov/39549898","citation_count":0,"is_preprint":false},{"pmid":"41690905","id":"PMC_41690905","title":"FOXJ1 mediates taxane resistance through regulation of microtubule dynamics.","date":"2026","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/41690905","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.17.683150","title":"Transcriptomic and protein analysis of human cortex reveals genes and pathways linked to NPTX2 disruption in Alzheimer’s disease","date":"2025-10-20","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.17.683150","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.06.10.658863","title":"Epigenetic regulation of cilia stability and kidney by the chromatin remodeling SWI/SNF complexes","date":"2025-06-14","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.10.658863","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.21.634139","title":"Multiciliated cells adapt the mechanochemical Piezo1-Erk1/2-Yap1 cell proliferation axis to fine-tune centriole number","date":"2025-01-23","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.21.634139","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.28.620684","title":"<i>Foxn3</i> is part of a transcriptional network that regulates primary cilia in the developing retina","date":"2024-10-28","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.28.620684","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.10.04.616471","title":"Single-cell RNA sequencing on formalin-fixed and paraffin-embedded (FFPE) tissue identified multi-ciliary cells in breast cancer","date":"2024-10-04","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.04.616471","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.07.24311531","title":"<i>SLC27A2</i>as a molecular marker of impaired epithelium in chronic rhinosinusitis with nasal polyps","date":"2024-08-07","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.07.24311531","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.09.632129","title":"Evidence for multiple independent expansions of Fox gene families within flatworms","date":"2025-01-13","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.09.632129","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45663,"output_tokens":8782,"usd":0.134359},"stage2":{"model":"claude-opus-4-6","input_tokens":12695,"output_tokens":3810,"usd":0.238088},"total_usd":0.372447,"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\": 2000,\n      \"finding\": \"Targeted deletion of Foxj1 (HFH-4) in mice results in complete absence of 9+2 motile cilia in airway epithelial cells, ependyma, and oviduct, while 9+0 sensory cilia (e.g., olfactory) are unaffected. Ultrastructural analysis showed that defective ciliogenesis is due to abnormal centriole migration and/or failure of apical membrane docking, indicating Foxj1 functions to direct basal body positioning and anchoring.\",\n      \"method\": \"Targeted gene knockout in mice, electron microscopy, in situ hybridization\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — clean KO with defined ultrastructural phenotype, replicated across multiple tissue types\",\n      \"pmids\": [\"10873152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Recombinant HFH-4 (FOXJ1) protein binds DNA with consensus sequences HWDTGTTTGTTTA or KTTTGTTGTTKTW, identified by in vitro DNA-binding site selection. HFH-4 forms specific protein-DNA complexes with promoter regions of genes including prothrombin, beta-amyloid precursor protein, CFTR, and HNF-3alpha, and acts as a potent transcriptional activator in cotransfection assays.\",\n      \"method\": \"In vitro DNA-binding site selection with recombinant protein, EMSA, cotransfection transcriptional activation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro DNA binding with consensus sequence determination and functional validation by cotransfection\",\n      \"pmids\": [\"9096351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In Foxj1-null airway epithelial cells, basal bodies form and cells commit to ciliogenesis, but basal bodies are disorganized in the apical compartment and fail to dock with the apical membrane. Reconstitution of Foxj1 in null cells restored normal basal body organization, resulting in axoneme growth, demonstrating Foxj1 functions specifically in late-stage ciliogenesis to regulate basal body docking and axoneme formation.\",\n      \"method\": \"Primary mouse airway epithelial cell culture, foxj1-null cells, gene delivery/reconstitution, ultrastructural analysis\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution experiment in null cells with functional rescue and ultrastructural readout\",\n      \"pmids\": [\"12818891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Microarray analysis of Foxj1-null vs. wild-type pulmonary epithelium identified calpastatin (a calpain inhibitor) as a Foxj1 target; loss of Foxj1 decreased calpastatin expression, leading to increased calpain activity, degradation of ezrin, and failure of basal bodies to anchor to the apical cytoskeleton. Treatment of Foxj1-null tracheal explants with a calpain inhibitor partially restored cilia and relocalized ezrin and EBP-50, establishing a Foxj1→calpastatin→calpain→ezrin→basal body anchoring pathway.\",\n      \"method\": \"Microarray, RNase protection, immunohistochemistry, western blot, immunoelectron microscopy, pharmacological rescue with calpain inhibitor\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including pharmacological rescue and immunoelectron microscopy establishing mechanistic pathway\",\n      \"pmids\": [\"14996907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Foxj1 expression is required for apical localization of ezrin (but not moesin) in airway epithelial cells. In Foxj1-null cells, membrane-cytoskeletal and threonine-phosphorylated ezrin are decreased, and ERM-associated EBP50 and beta2 adrenergic receptor fail to localize apically, demonstrating Foxj1 differentially regulates ERM proteins to organize multi-protein complexes at apical membranes of ciliated cells.\",\n      \"method\": \"Foxj1-null mouse airway epithelial cells, immunofluorescence, western blot, fractionation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined molecular phenotype using multiple methods\",\n      \"pmids\": [\"14625387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Foxj1 suppresses NF-κB transcriptional activity in T cells. Foxj1-deficient T cells show increased NF-κB activity in vivo, and Foxj1 can regulate IκB proteins, particularly IκBβ. Loss of Foxj1 results in multiorgan systemic inflammation, exaggerated Th1 cytokine production, and T cell proliferation in autologous mixed lymphocyte reactions, establishing Foxj1 as an NF-κB repressor in T cells.\",\n      \"method\": \"Foxj1 knockout mice, in vitro NF-κB transcriptional assays, T cell functional assays, cytokine measurement\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with in vitro mechanistic follow-up showing NF-κB suppression and IκBβ regulation\",\n      \"pmids\": [\"14963332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Foxj1 promotes RhoA and RhoB activation during ciliogenesis. Foxj1-null mice lack apical actin web formation and basal body docking, which are both rescued by RhoA activation. Foxj1 expression coincides with and is required for apical actin web formation essential for basal body docking, and Foxj1 also promotes apical ezrin localization via RhoA, placing Foxj1 upstream of RhoA in cytoskeletal remodeling during ciliogenesis.\",\n      \"method\": \"Primary mouse airway epithelial cell culture, Foxj1-null mice, actin perturbation assays, RhoA inhibition, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistatic ordering of Foxj1 and RhoA with multiple functional readouts in null and pharmacological models\",\n      \"pmids\": [\"17488776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Zebrafish foxj1a, a target of Hedgehog signaling in the floor plate, acts as a master regulator of motile cilia formation. Foxj1a loss compromises assembly of motile cilia in floor plate, Kupffer's vesicle, and pronephric ducts, and its ectopic expression is sufficient to induce ectopic development of motile cilia-like structures. A paralogous gene foxj1b regulates motile cilia in the otic vesicle.\",\n      \"method\": \"Zebrafish loss-of-function (morpholino), ectopic expression assays, epistasis with Hedgehog signaling\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function and gain-of-function in vivo with defined ciliary phenotype, corroborated by parallel study\",\n      \"pmids\": [\"19011630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Xenopus and zebrafish Foxj1 is required for formation of motile cilia at the gastrocoel roof plate (GRP) and Kupffer's vesicle that underlie left-right patterning. Microarray analysis showed Foxj1 induces cilia formation by upregulating motile cilia gene expression. Misexpression of Foxj1 is sufficient to induce ectopic GRP-like cilia formation in frog embryos.\",\n      \"method\": \"Morpholino knockdown in Xenopus/zebrafish, ectopic expression, microarray transcriptional profiling\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — parallel study with two model organisms, loss- and gain-of-function plus transcriptome-wide target identification\",\n      \"pmids\": [\"19011629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"IL-13 treatment of differentiated human airway epithelium decreases foxj1 expression via a STAT6-binding element in the foxj1 promoter. STAT-6 and IL-13 inhibit foxj1 expression, resulting in loss of apical basal body localization, loss of ezrin from the apical compartment, and loss of ciliated cells, establishing an IL-13/STAT6→FOXJ1 regulatory axis in airway ciliogenesis.\",\n      \"method\": \"Human airway epithelial culture, IL-13 treatment, STAT6 inhibition, promoter analysis, immunofluorescence\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — promoter element identified and functionally linked to ciliated cell loss via multiple methods\",\n      \"pmids\": [\"17541011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Wnt/β-catenin signaling directly regulates foxj1a expression and ciliogenesis in zebrafish Kupffer's vesicle. Enhancer analysis identifies Lef1/Tcf binding sites required for KV-specific foxj1a expression. Wnt signaling reduction causes shorter/fewer cilia, loss of cilia motility, and LR patterning defects that are rescued by KV-targeted foxj1a overexpression, placing Wnt/β-catenin upstream of Foxj1 in the ciliogenic hierarchy. Epistasis with FGF pathway shows Wnt acts more downstream.\",\n      \"method\": \"Zebrafish genetic/pharmacological Wnt inhibition, enhancer/promoter analysis, morpholino, KV-targeted mRNA injection, epistasis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistatic rescue experiment with enhancer validation identifying direct transcriptional regulation\",\n      \"pmids\": [\"22190638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mouse Noto acts upstream of Foxj1 in the node; Foxj1 expressed from the Noto locus restores structurally normal motile cilia in Noto-null nodes. However, Foxj1 is not sufficient for correct posterior cilia positioning on node cells (a Noto-regulated event), and Foxj1 is essential for ciliogenesis in the node upstream of Rfx3, establishing the epistatic order Noto→Foxj1→Rfx3 in nodal ciliogenesis.\",\n      \"method\": \"Knock-in of Foxj1 cDNA into Noto locus, Foxj1-null mouse analysis, nodal cilia ultrastructure and flow analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — elegant knock-in rescue experiment with defined epistatic ordering\",\n      \"pmids\": [\"22357932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FOXJ1 and RFX3 physically interact (co-immunoprecipitation) and cooperatively induce cilia gene expression in human airway basal cells. FOXJ1 transfection activates ciliated gene promoters and induces RFX3 expression; RFX3 alone cannot induce cilia genes. The combination of FOXJ1+RFX3 enhances ciliated gene promoter activity and mRNA expression beyond FOXJ1 alone, establishing RFX3 as a co-activator of FOXJ1.\",\n      \"method\": \"Human airway basal cell transfection, air-liquid interface differentiation, promoter assays, co-immunoprecipitation, TaqMan PCR\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal functional evidence with protein interaction confirmed by co-IP and multiple transcriptional readouts\",\n      \"pmids\": [\"23822649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"p73 directly regulates Foxj1 transcription in multiciliated cells. ChIP-seq in murine tracheal cells identifies Foxj1 as a direct p73 (and p63) target gene. Loss of p73 impairs MCC differentiation, causing hydrocephalus, hippocampal dysgenesis, sterility, and chronic airway inflammation, establishing p73 as an upstream transcriptional activator of Foxj1 in the multiciliogenesis program.\",\n      \"method\": \"p73 knockout mice, ChIP-seq, gene expression analysis, functional phenotypic characterization\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP-seq establishing direct binding combined with KO phenotype and validated target genes\",\n      \"pmids\": [\"26947080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The m6A demethylase FTO stabilizes FOXJ1 mRNA by removing m6A modifications. FTO depletion leads to FOXJ1 mRNA destabilization and severe loss of ciliated cells in primary human airway epithelium, with increase in goblet cells. In Xenopus, Foxj1 is a phenocritical FTO target for motile ciliogenesis, establishing an FTO→FOXJ1 mRNA stability axis upstream of the ciliogenic program.\",\n      \"method\": \"FTO depletion in Xenopus (morpholino), human airway epithelium (siRNA/KD), mRNA stability assays, m6A analysis, Fto knockout mice\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — conserved mechanism demonstrated across three species with direct mRNA stability measurements\",\n      \"pmids\": [\"33761320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Foxj1 expression in the neural tube (chick and mouse floor plate) is regulated by Shh signaling, is sufficient to increase cilia length in neuroepithelial cells when ectopically expressed, and attenuates intracellular Shh signaling by decreasing Gli protein activity in a cilia-dependent manner, establishing a feedback mechanism where Foxj1-induced cilia modulate Shh signal transduction.\",\n      \"method\": \"Chick electroporation, mouse Foxj1-null analysis, Shh signaling assays, ectopic expression in Shh-responsive cell line\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function, loss-of-function, and in vitro signaling assays with mechanistic pathway elucidation\",\n      \"pmids\": [\"21098568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Foxj1 restrains B cell activation intrinsically by antagonizing NF-κB and its target IL-6. Foxj1 deficiency in B cells results in spontaneous and accentuated germinal center formation, pathogenic autoantibodies, and accentuated immunization responses, correlating with a requirement for Foxj1 to regulate the inhibitory NF-κB component IκBβ.\",\n      \"method\": \"Foxj1-deficient B cell analysis, NF-κB activity assays, germinal center formation, autoantibody detection\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined molecular mechanism (IκBβ regulation) and cellular phenotype\",\n      \"pmids\": [\"16002694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PITX2 binds the FoxJ1 promoter (shown by chromatin immunoprecipitation) and activates FoxJ1 expression. Lef-1 and β-catenin interact with PITX2 to synergistically regulate the FoxJ1 promoter. FoxJ1 physically interacts with the PITX2 homeodomain to synergistically regulate FoxJ1 expression, providing a positive autoregulatory feedback mechanism. The ARS-associated PITX2 T68P mutant interacts with FoxJ1 but cannot activate the FoxJ1 promoter.\",\n      \"method\": \"Chromatin immunoprecipitation, cotransfection promoter assays, protein-protein interaction (co-IP/pulldown), PITX2 transgenic mouse fibroblasts\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP confirming promoter binding, co-IP for protein interaction, and functional promoter assays including mutant\",\n      \"pmids\": [\"18723525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"De novo heterozygous loss-of-function mutations in FOXJ1 cause an autosomal-dominant motile ciliopathy with hydrocephalus, chronic airway disease, and left/right body asymmetry randomization. Mutant respiratory epithelial cells have reduced cilia number per cell, impaired fluid flow, and mislocalized basal bodies. The focal adhesion protein PTK2 displays aberrant cytoplasmic localization in mutant cells.\",\n      \"method\": \"Whole-exome/genome sequencing, high-speed video microscopy, TEM, immunofluorescence in patient cells\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetics with functional validation in patient cells using multiple methods\",\n      \"pmids\": [\"31630787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Heterozygous disruption of one Foxj1 allele in mice leads to incomplete ependymal cell differentiation with decreased mature ependymal cell number, decreased motile cilia number, abnormal axonemes in 12% of cilia, decreased microtubule attachment to basal bodies, random localization and orientation of basal body patches, loss of planar cell polarity, and disruption of unidirectional CSF flow causing communicating hydrocephalus.\",\n      \"method\": \"Foxj1 heterozygous knockout mice, immunofluorescence, electron microscopy, CSF flow analysis\",\n      \"journal\": \"Cellular and molecular neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean heterozygous mouse KO with ultrastructural and functional ciliary readouts\",\n      \"pmids\": [\"37620636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Foxj1 regulates thymic egress of T cells. CD2-Foxj1 transgenic mice exhibit peripheral T cell lymphopenia associated with accumulation of mature single-positive thymocytes. Transgenic thymocytes demonstrate impaired thymic exodus in response to CCL19, apparently independent of CCR7, S1P1, and NF-κB, demonstrating a role for Foxj1 in thymocyte egress.\",\n      \"method\": \"CD2-Foxj1 transgenic mice on MRL/lpr background, adoptive transfer, chemokine migration assays\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transgenic mouse with defined phenotype, but mechanism of egress regulation not fully elucidated\",\n      \"pmids\": [\"16339515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In Xenopus, ATP4a is required for Wnt/β-catenin-regulated Foxj1 induction in the superficial mesoderm. Gene knockdown or pharmacological inhibition of ATP4 compromises organ situs, asymmetric marker gene expression, leftward flow, and Foxj1 expression. ATP4 acts upstream of Wnt/β-catenin→Foxj1 induction and Wnt/PCP-dependent cilia polarization in symmetry breaking.\",\n      \"method\": \"Xenopus morpholino knockdown, pharmacological inhibition, gene expression analysis, cilia analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistatic ordering in one model organism without direct mechanistic link between ATP4 and Wnt\",\n      \"pmids\": [\"22832275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FOXJ1 overexpression prevents cigarette smoke extract (CSE)-mediated inhibition of cilia growth in human airway basal cell ALI cultures, partially reversing CSE-induced suppression of cilia-related genes involved in intraflagellar transport, motility, structural integrity, and basal body development.\",\n      \"method\": \"Human airway basal cell ALI cultures, lentiviral FOXJ1 overexpression, cilia length measurement, gene expression profiling\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function rescue experiment with defined transcriptional and morphological readouts\",\n      \"pmids\": [\"24828273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Estradiol (E2) induces Foxj1 expression in rat oviduct infundibulum/ampulla via estrogen receptor, and Foxj1 expression precedes cilia appearance. Foxj1-deficient mice completely lack oviductal cilia, demonstrating Foxj1 is directly required for oviductal ciliogenesis, while ERα signaling is not essential (ERα-deficient mice retain cilia).\",\n      \"method\": \"Rat oviduct organ culture with E2, ER antagonist, Foxj1-null and ERα-null mouse analysis, immunohistochemistry\",\n      \"journal\": \"Journal of molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — null mouse phenotype with epistatic dissection of ER vs Foxj1 requirement\",\n      \"pmids\": [\"15171704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LRRC6 facilitates active nuclear translocation of FOXJ1. In Lrrc6 knockout mice, FOXJ1 is retained in the cytoplasm; LRRC6 expression promotes FOXJ1 nuclear translocation, which is blocked by INI-43 (an importin α inhibitor), suggesting an importin α-dependent nuclear import pathway for FOXJ1 regulated by LRRC6.\",\n      \"method\": \"Lrrc6 KO mice, immunofluorescence, pharmacological inhibition (INI-43), transcriptomic analysis of cilia genes\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with pharmacological inhibition identifying importin α involvement, single lab\",\n      \"pmids\": [\"37328841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Microarray screening of Foxj1-deficient vs. wild-type fetal mouse lungs and Noto-null embryos identified 326 candidate FOXJ1-dependent ciliogenesis-associated genes, including Cfap206, Cfap157, Fam183b, and 1700012B09Rik, providing the downstream genetic program of motile ciliogenesis regulated by FOXJ1 in mammalian tissues.\",\n      \"method\": \"Microarray of Foxj1-deficient and stage-matched fetal mouse lungs and node embryos, functional validation of selected targets\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide transcriptional target identification with functional follow-up of selected targets\",\n      \"pmids\": [\"27914912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CFAP157, a FOXJ1 target gene, encodes a protein localizing to basal bodies that interacts with tubulin and the centrosomal protein CEP350. Cfap157 knockout mice are male-infertile with flagellar axoneme defects including supernumerary axonemal profiles and ectopic accessory structures, establishing CFAP157 as a FOXJ1 effector required for spermiogenesis.\",\n      \"method\": \"Foxj1-dependent expression analysis, Cfap157 KO mice, protein-protein interaction (pulldown), immunofluorescence, electron microscopy\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with ultrastructural phenotype and protein interaction data\",\n      \"pmids\": [\"27965440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CFAP206, a FOXJ1 target gene, encodes a protein localizing to the basal body and axoneme of motile cilia. Cfap206 knockout mice show male infertility, hydrocephalus, and impaired mucociliary clearance. Electron tomography of knockout sperm flagella indicates a role in radial spoke formation, consistent with FAP206 function in Tetrahymena.\",\n      \"method\": \"Foxj1-dependent expression analysis, Cfap206 KO mice and Xenopus crispants, electron tomography, ciliary beat frequency measurement\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse and Xenopus with ultrastructural and functional readouts\",\n      \"pmids\": [\"32376681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A truncating FOXJ1 variant (p.Glu267Glyfs*12) fails to induce ectopic cilia in frog epidermis in vivo and fails to activate the ADGB promoter (a downstream FOXJ1 target) in transactivation assays, demonstrating loss of transcriptional transactivation function associated with congenital heart defects in a patient.\",\n      \"method\": \"Xenopus ectopic cilia assay, in vitro promoter transactivation, exome sequencing\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional in vivo and in vitro validation of patient variant, single study\",\n      \"pmids\": [\"37158461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Recombinant FOXJ1 protein binds DNA at the FOX consensus sequence, forms cysteine-dependent higher-order oligomers via disulfide bridges, contains polyacidic gel-shifting domains at the N- and C-termini causing anomalous electrophoretic migration, and harbors intrinsically disordered regions.\",\n      \"method\": \"Recombinant protein expression, DNA-binding assay, DTT reduction of oligomers, SDS-PAGE anomalous migration analysis\",\n      \"journal\": \"Protein expression and purification\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical characterization, single study, novel findings on protein biochemistry\",\n      \"pmids\": [\"39549898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In zebrafish and mice, Foxj1 is expressed in olfactory sensory neurons (OSNs) and is required for olfactory cilia biogenesis and for differentiation of OSNs themselves, including regulation of olfactory marker protein (omp) expression. Ciliary motility genes are repressed in OSNs despite Foxj1 expression, showing the motile ciliogenic program is repurposed for immotile olfactory cilia.\",\n      \"method\": \"Zebrafish Foxj1 mutants, mouse Foxj1 analysis, single-cell transcriptomics, odor response assays, in situ hybridization\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function in two vertebrate species with functional (olfactory response) and transcriptional readouts\",\n      \"pmids\": [\"38271330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"FOXJ1 overexpression in prostate cancer cells confers docetaxel resistance by decreasing docetaxel-mediated microtubule bundling, while FOXJ1 knockdown impairs basal microtubule function, enhances taxane binding to microtubules, and increases docetaxel sensitivity. TPPP3, a microtubule-associated FOXJ1-regulated gene, has similar effects on taxane resistance when overexpressed.\",\n      \"method\": \"Prostate cancer PDX in vivo models, FOXJ1 overexpression/knockdown in vitro and in vivo, microtubule bundling assays, taxane binding assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional genetic manipulation (OE and KD) with mechanistic in vitro assays and in vivo validation\",\n      \"pmids\": [\"41690905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FoxJ1 is required during embryonic spinal cord development for progenitor proliferation and cell fate determination, and FoxJ1 loss results in formation of adult ependymal cells with impaired stem cell potential and inability to respond to spinal cord injury.\",\n      \"method\": \"FoxJ1 fate-mapping mouse lines, FoxJ1 knock-in mice, spinal cord injury model, immunofluorescence, proliferation assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO and knock-in mice with defined developmental and injury-response phenotypes, single lab\",\n      \"pmids\": [\"29689278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In Xenopus, foxj1 knockdown (morpholino) in the CNS causes absence of ependymal cilia, impaired CSF flow, and fourth ventricle hydrocephalus, establishing that motile ependymal cilia driven by Foxj1 are essential for CSF circulation and maintenance of homeostatic fluid pressure in the brain.\",\n      \"method\": \"Xenopus foxj1 morpholino knockdown, scanning electron microscopy, bead injection and video microscopy of CSF flow\",\n      \"journal\": \"Cilia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — morpholino KD with functional CSF flow readout, single model organism\",\n      \"pmids\": [\"24229449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In Foxj1/inv double mutant mice, the random laterality phenotype of Foxj1 is dominant over the reversal-of-situs phenotype of inv, and right pulmonary isomerism (due to absent bilateral Pitx2 expression in lateral plate mesoderm) is a major phenotype of Foxj1-null mice. This epistatic analysis places Foxj1 upstream of Pitx2 in left-right axis determination.\",\n      \"method\": \"Double mutant mouse analysis (Foxj1 × inv), lung morphology, in situ hybridization for Pitx2\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in double mutant mouse, placing Foxj1 in LR pathway upstream of Pitx2\",\n      \"pmids\": [\"16325766\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FOXJ1 is a forkhead transcription factor that acts as a master regulator of motile ciliogenesis by directly activating a transcriptional program of motile cilia genes (including targets like CFAP206, CFAP157, and calpastatin), is itself regulated upstream by p73, Wnt/β-catenin, Hedgehog signaling, PITX2, and FTO-mediated mRNA stabilization, controls basal body docking at the apical membrane via RhoA activation and the calpastatin-calpain-ezrin axis, physically interacts with RFX3 as a co-activator, requires LRRC6-mediated importin α-dependent nuclear translocation for activity, and additionally functions in immune cell homeostasis by antagonizing NF-κB activity through regulation of IκBβ in T and B cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FOXJ1 is a forkhead-family transcription factor that serves as a master regulator of motile ciliogenesis across vertebrate tissues, controlling basal body docking, apical membrane organization, and axoneme assembly. FOXJ1 binds FOX consensus DNA sequences as a transcriptional activator, directly inducing a program of hundreds of cilia-associated genes (including CFAP206, CFAP157, and calpastatin), and cooperates with the co-activator RFX3 to enhance ciliated gene expression [PMID:9096351, PMID:12818891, PMID:23822649, PMID:27914912]. Mechanistically, FOXJ1 promotes basal body anchoring through a calpastatin–calpain–ezrin pathway and RhoA-dependent apical actin web formation, and its nuclear translocation requires LRRC6-mediated importin-α-dependent import; upstream, FOXJ1 transcription and mRNA stability are regulated by p73, Wnt/β-catenin, Hedgehog/Shh, PITX2, IL-13/STAT6, and FTO-mediated m6A demethylation [PMID:14996907, PMID:17488776, PMID:37328841, PMID:26947080, PMID:22190638, PMID:33761320]. Heterozygous loss-of-function mutations in FOXJ1 cause an autosomal-dominant motile ciliopathy featuring hydrocephalus, chronic airway disease, and laterality defects, and FOXJ1 additionally functions outside ciliated epithelia to antagonize NF-κB via IκBβ regulation in T and B cells [PMID:31630787, PMID:14963332, PMID:16002694].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that FOXJ1 is a sequence-specific DNA-binding transcriptional activator answered the fundamental question of how FOXJ1 functions molecularly — as a direct transcription factor rather than a cofactor or signaling molecule.\",\n      \"evidence\": \"In vitro DNA-binding site selection with recombinant protein, EMSA, and cotransfection activation assays\",\n      \"pmids\": [\"9096351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological target genes in vivo not yet identified\", \"No structural information on the DNA-binding domain\", \"Activator versus repressor activity context-dependent\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"The Foxj1 knockout mouse revealed that FOXJ1 is essential specifically for motile (9+2) ciliogenesis but dispensable for sensory (9+0) cilia, and that the defect lies in basal body migration and apical docking rather than basal body formation per se.\",\n      \"evidence\": \"Targeted gene knockout in mice with electron microscopy across airway, ependyma, and oviduct\",\n      \"pmids\": [\"10873152\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular targets mediating basal body docking unknown\", \"Whether Foxj1 is sufficient for cilia formation untested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Reconstitution of Foxj1 in null airway cells rescued basal body docking and axoneme growth, establishing that Foxj1 functions cell-autonomously at a late stage of ciliogenesis and is both necessary and sufficient for basal body anchoring in committed ciliated precursors.\",\n      \"evidence\": \"Gene delivery and reconstitution in Foxj1-null primary mouse airway epithelial cells with ultrastructural analysis\",\n      \"pmids\": [\"12818891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effector genes mediating rescue not identified\", \"Whether Foxj1 acts alone or requires cofactors unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identification of the Foxj1→calpastatin→calpain→ezrin pathway revealed the first molecular mechanism linking FOXJ1 transcriptional activity to cytoskeletal remodeling required for basal body anchoring at the apical membrane.\",\n      \"evidence\": \"Microarray of Foxj1-null lung, immunoelectron microscopy, and pharmacological rescue with calpain inhibitor in tracheal explants\",\n      \"pmids\": [\"14996907\", \"14625387\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether calpastatin is a direct transcriptional target not confirmed by ChIP\", \"Only partial rescue by calpain inhibition suggests additional pathways\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Discovery that FOXJ1 suppresses NF-κB via IκBβ in T cells, with Foxj1-null mice developing systemic inflammation and autoimmunity, revealed a non-ciliary immune-regulatory function for FOXJ1 and broadened its biological role beyond epithelial ciliogenesis.\",\n      \"evidence\": \"Foxj1 knockout mice with NF-κB transcriptional assays, T cell and B cell functional assays\",\n      \"pmids\": [\"14963332\", \"16002694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IκBβ is a direct transcriptional target of FOXJ1 not shown\", \"Mechanism of NF-κB antagonism (transcriptional vs. protein-level) not fully resolved\", \"Relevance to human immune disease unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placing FOXJ1 upstream of RhoA activation and apical actin web formation established a second effector pathway by which FOXJ1 remodels the apical cytoskeleton for basal body docking, complementing the calpastatin–ezrin axis.\",\n      \"evidence\": \"Foxj1-null primary airway cells with RhoA activity assays and pharmacological/genetic rescue\",\n      \"pmids\": [\"17488776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FOXJ1 activates a Rho-GEF transcriptionally or acts through another mechanism unknown\", \"Relationship between RhoA and calpastatin pathways not clarified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Studies in zebrafish and Xenopus demonstrated that Foxj1 is both necessary and sufficient for motile cilia formation in left-right organizer structures and is a downstream target of Hedgehog, Wnt/β-catenin, and PITX2 signaling, establishing the upstream regulatory hierarchy controlling Foxj1 expression.\",\n      \"evidence\": \"Morpholino knockdown and ectopic expression in zebrafish/Xenopus; ChIP and promoter assays for PITX2 binding; epistasis with Hedgehog and Wnt\",\n      \"pmids\": [\"19011630\", \"19011629\", \"18723525\", \"22190638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of multiple upstream inputs (Shh, Wnt, PITX2) at the Foxj1 promoter not resolved\", \"Whether all upstream pathways are conserved in mammals not fully tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The finding that Foxj1-induced cilia attenuate Shh signaling by reducing Gli activity established a negative feedback loop where Foxj1, itself a Shh target, modulates the very pathway that activates it.\",\n      \"evidence\": \"Chick electroporation, mouse Foxj1-null analysis, and Shh signaling assays in cell lines\",\n      \"pmids\": [\"21098568\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which cilia length increase attenuates Gli activity not molecularly defined\", \"Generality across tissues beyond floor plate not established\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Knock-in of Foxj1 into the Noto locus rescued nodal cilia structure but not posterior positioning, establishing the epistatic hierarchy Noto→Foxj1→Rfx3 and distinguishing FOXJ1's role in cilia assembly from planar cell polarity.\",\n      \"evidence\": \"Foxj1 cDNA knock-in into Noto locus in mouse, nodal cilia ultrastructure and flow analysis\",\n      \"pmids\": [\"22357932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Noto activates Foxj1 transcription not defined\", \"Whether Rfx3 is a direct Foxj1 target not shown by ChIP at this locus\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstration that FOXJ1 and RFX3 physically interact and cooperatively activate cilia gene promoters resolved how FOXJ1 achieves target gene specificity and transcriptional potency during multiciliogenesis.\",\n      \"evidence\": \"Co-immunoprecipitation, promoter assays, and gene expression analysis in human airway basal cells\",\n      \"pmids\": [\"23822649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of FOXJ1–RFX3 interaction unknown\", \"Genome-wide co-occupancy not mapped\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"ChIP-seq identification of Foxj1 as a direct p73 target in multiciliated cells, combined with genome-wide identification of ~326 FOXJ1-dependent ciliogenesis genes including CFAP206 and CFAP157, defined both the upstream activator and the downstream transcriptional program of FOXJ1.\",\n      \"evidence\": \"p73 ChIP-seq in murine tracheal cells; microarray of Foxj1-null fetal lungs and Noto-null embryos; KO mouse validation of CFAP targets\",\n      \"pmids\": [\"26947080\", \"27914912\", \"27965440\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which of the 326 genes are direct versus indirect FOXJ1 targets not resolved genome-wide\", \"Functional hierarchy among FOXJ1 target genes not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of heterozygous FOXJ1 loss-of-function mutations as the cause of an autosomal-dominant motile ciliopathy in humans translated the mouse phenotype to clinical genetics, confirming haploinsufficiency as disease mechanism.\",\n      \"evidence\": \"Whole-exome/genome sequencing of patient cohort with functional validation in patient respiratory epithelial cells\",\n      \"pmids\": [\"31630787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype correlation across different FOXJ1 mutations incomplete\", \"Whether PTK2 mislocalization is mechanistically causal or secondary unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that FTO stabilizes FOXJ1 mRNA through m6A demethylation revealed a post-transcriptional regulatory layer controlling FOXJ1 abundance, upstream of and independent from transcriptional regulation.\",\n      \"evidence\": \"FTO depletion in human airway epithelium and Xenopus with mRNA stability and m6A measurements; Fto knockout mice\",\n      \"pmids\": [\"33761320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific m6A sites on FOXJ1 mRNA responsible for destabilization not mapped\", \"Which m6A reader mediates FOXJ1 mRNA decay unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstration that LRRC6 facilitates importin-α-dependent nuclear translocation of FOXJ1 resolved a long-standing question of how cytoplasmic FOXJ1 protein accesses the nucleus to activate its target genes.\",\n      \"evidence\": \"Lrrc6 KO mice showing cytoplasmic FOXJ1 retention; pharmacological blockade with importin-α inhibitor INI-43\",\n      \"pmids\": [\"37328841\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct LRRC6–FOXJ1 physical interaction not demonstrated\", \"Whether LRRC6 acts as an adaptor or modifies FOXJ1 for importin recognition unknown\", \"Single laboratory finding\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extension of Foxj1 function to olfactory sensory neuron differentiation and immotile olfactory cilia biogenesis showed that the FOXJ1 ciliogenic program is modularly repurposed, with motile cilia genes actively repressed in this context.\",\n      \"evidence\": \"Foxj1 mutant zebrafish and mouse with single-cell transcriptomics and olfactory functional assays\",\n      \"pmids\": [\"38271330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of selective repression of motility genes in OSNs unknown\", \"Which co-factors specify the immotile versus motile program in FOXJ1-expressing cells not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of FOXJ1 DNA binding and oligomerization, genome-wide discrimination of direct versus indirect targets, how FOXJ1 integrates multiple upstream signals at its promoter, and how the motile versus immotile cilia program is differentially specified in FOXJ1-expressing cells.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of FOXJ1 or FOXJ1–DNA complex\", \"Genome-wide ChIP-seq for FOXJ1 itself not reported\", \"Mechanism selecting motile versus immotile cilia gene sets unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 29]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 3, 5, 7, 8, 12, 25, 28, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 12, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2, 7, 8, 11, 19, 27]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 3, 12, 13, 25]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 16, 20]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 15, 17]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"RFX3\",\n      \"PITX2\",\n      \"LRRC6\",\n      \"LEF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}