{"gene":"RFX3","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2004,"finding":"RFX3 is essential for the elongation of nodal monocilia during embryonic development; Rfx3-deficient mice exhibit stunted nodal cilia, leading to left-right asymmetry defects. RFX3 regulates expression of D2lic (mouse orthologue of a C. elegans intraflagellar transport gene), placing RFX3 upstream of intraflagellar transport in ciliogenesis.","method":"Rfx3 knockout mouse (loss-of-function), ultrastructural analysis of nodal cilia, RT-PCR for D2lic expression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular and developmental phenotype, molecular target identified, replicated across multiple studies","pmids":["15121860"],"is_preprint":false},{"year":2006,"finding":"RFX3 is required for differentiation of ciliated ependymal cells (including subcommissural organ and choroid plexus cells) in the mouse brain; Rfx3 deficiency causes hydrocephalus associated with agenesis of the subcommissural organ and downregulation of SCO-spondin expression.","method":"Rfx3 knockout mouse, ultrastructural analysis, immunohistochemistry, RT-PCR for SCO-spondin","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — clean KO with specific cellular phenotype and molecular marker, well-controlled","pmids":["16930429"],"is_preprint":false},{"year":2007,"finding":"RFX3 is expressed in pancreatic endocrine progenitors and all major islet cell lineages; Rfx3-deficient mice exhibit reduced insulin-, glucagon-, and ghrelin-producing cells, increased pancreatic polypeptide cells, stunted primary cilia on islet cells, and impaired glucose tolerance, demonstrating a role for RFX3 in pancreatic endocrine cell differentiation.","method":"Rfx3 knockout mouse, immunofluorescence, electron microscopy of primary cilia, glucose tolerance testing","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular and functional phenotype, multiple orthogonal methods","pmids":["17229940"],"is_preprint":false},{"year":2009,"finding":"RFX3 is required for the growth and beating efficiency of motile cilia in multiciliated brain cells; RFX3 regulates FOXJ1 transcription factor expression and directly binds the promoters of axonemal dynein genes required for ciliary motility.","method":"Rfx3 knockout primary mouse brain cell cultures, ChIP (direct promoter binding), cilia beat frequency measurements","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP demonstrating direct promoter binding plus functional phenotype in primary KO cells, multiple methods","pmids":["19671664"],"is_preprint":false},{"year":2010,"finding":"RFX3 is required for the differentiation and function of mature beta-cells; it directly binds the Pal-1 and Pal-2 regulatory sequences in the neuroendocrine promoter of the glucokinase gene, regulating glucokinase and Glut-2 expression and glucose-stimulated insulin secretion.","method":"Rfx3 knockout mouse, pancreas-specific conditional KO, RNA interference in Min6 cells, quantitative ChIP, ChIP sequencing, bandshift (EMSA) assays","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1 — direct binding demonstrated by ChIP-seq and EMSA, confirmed in multiple genetic models and cell lines","pmids":["20413507"],"is_preprint":false},{"year":2012,"finding":"RFX3 controls corpus callosum formation indirectly by regulating patterning of the cortical-septal boundary before E12.5, which leads to proper distribution of guidepost neurons; RFX3 deficiency results in ectopic FGF8 expression associated with a reduced GLI3 repressor-to-activator ratio, and ectopic FGF8 reproduces the guidepost neuron defects.","method":"Rfx3 knockout mouse, conditional genetic inactivation, transplantation assays, brain explant cultures with FGF8, GLI3 isoform analysis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — epistasis via conditional KO plus functional rescue/phenocopy in explant cultures with multiple orthogonal methods","pmids":["22479201"],"is_preprint":false},{"year":2013,"finding":"RFX3 physically interacts with FOXJ1 and acts as a transcriptional co-activator; combined FOXJ1+RFX3 transfection enhances ciliated gene promoter activity and mRNA expression beyond FOXJ1 alone in human airway basal cells, while RFX3 alone cannot induce cilia-related gene expression.","method":"Co-immunoprecipitation of FOXJ1 and RFX3, plasmid-mediated gene transfer in primary human airway basal cells, promoter-reporter assays, TaqMan PCR","journal":"Respiratory research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus functional promoter assays in primary human cells","pmids":["23822649"],"is_preprint":false},{"year":2015,"finding":"RFX3 is required for proper formation of the thalamocortical tract by establishing the correct cellular environment in the ventral telencephalon; Rfx3 deficiency causes heterotopias expressing Slit1 and Netrin1 guidance cues, leading to aberrant thalamocortical axon projections; identical defects occur in Inpp5e mutants, indicating primary cilia signaling underlies tract formation.","method":"Rfx3 knockout mouse, DiI axon tracing, immunohistochemistry, genetic epistasis with Inpp5e mutants","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — axon tracing with defined phenotype, confirmed by independent ciliary mutant (epistasis)","pmids":["25631876"],"is_preprint":false},{"year":2018,"finding":"RFX3 undergoes enzyme-independent auto-S-fatty acylation (preferentially by stearic and oleic acid) at a conserved cysteine in its dimerization domain; this modification promotes homodimerization, ciliary gene expression, ciliogenesis, cilia elongation, and Hedgehog signaling. A fatty acylation-deficient mutant fails in all these functions.","method":"Chemical reporters of protein fatty acylation, mass spectrometry, active-site mutagenesis, dimerization assays, ciliogenesis assays, Hedgehog signaling reporters","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical demonstration of auto-acylation, mutagenesis of active site, multiple functional readouts","pmids":["30127002"],"is_preprint":false},{"year":2018,"finding":"RFX1 homodimers and RFX1/RFX3 heterodimers bind specifically to the double-stranded D sequence of AAV inverted terminal repeats, and RFX proteins can be pulled down with the AAV genome in transduced HEK-293 cells, indicating RFX3 acts as a regulator of AAV-mediated transgene expression.","method":"Electromobility shift assay (EMSA), supershift experiments, co-immunoprecipitation/pulldown with AAV genome from transduced cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — EMSA with supershift and pulldown from cells, but limited functional follow-up","pmids":["29317724"],"is_preprint":false},{"year":2025,"finding":"In human iPSC-derived neurons, monoallelic RFX3 loss diminishes neuronal activity-dependent gene expression; RFX3 binding sites co-localize with CREB binding sites near activity-dependent genes, and RFX3 deficiency leads to decreased CREB binding and impaired induction of CREB targets upon neuronal depolarization.","method":"iPSC-derived neurons and forebrain organoids with biallelic or monoallelic RFX3 loss, transcriptomics, ChIP-seq/DNA binding analysis, neuronal depolarization assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq and transcriptomics in human neurons with loss-of-function; preprint, not yet peer-reviewed","pmids":["40060598"],"is_preprint":true},{"year":2025,"finding":"CRTC1 and CREB1 interact with RFX3 in an activity-dependent manner in rodent forebrain neurons; glutamatergic stimulation recruits CRTC1 and CREB1 to activity-dependent enhancers enriched in RFX3 motifs, indicating cooperative chromatin binding between CREB1 and RFX3 at activity-dependent loci.","method":"Proximity labeling (BioID) in rodent forebrain neurons, ChIP-seq, neuronal activity stimulation assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — proximity labeling plus ChIP-seq; preprint, single lab","pmids":["40631264"],"is_preprint":true},{"year":2024,"finding":"A short hydrophobic motif (LXXLXWL) shared by FOXJ1, FOXN4, and FOXN3 is required for physical association with the RFX3 dimerization domain; mutations in RFX3 at the predicted interaction site disrupted association with FOXN3 or FOXN4, and this interaction mediates both transcriptional repression (by FOXN3) and activation (by FOXN4) of cilia genes.","method":"CUT&RUN chromatin profiling, co-immunoprecipitation, domain mutagenesis, AlphaFold3 structural prediction, in vitro transcriptional reporter assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical co-IP with mutagenesis and functional reporter assays; preprint","pmids":["bio_10.1101_2024.10.28.620684"],"is_preprint":true},{"year":2025,"finding":"RFX3 is required for human pancreatic islet cell differentiation; RFX3 knockout in iPSC-derived islet organoids reduces hormone-secreting cells, impairs beta-cell function and insulin secretion, and leads to increased enterochromaffin cell specification; RFX3 overexpression rescues dysregulated gene expression.","method":"CRISPR/Cas9 RFX3 KO in iPSCs, pancreatic islet organoid differentiation, single-cell RNA-seq, bulk RNA-seq, glucose-stimulated insulin secretion assay, RFX3 overexpression rescue","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO with rescue, multiple orthogonal methods in human stem cell model","pmids":["40263183"],"is_preprint":false},{"year":2024,"finding":"In cochlear outer hair cells, Rfx3 binds intronic enhancers of Triobp and regulatory regions of Insm1, Ikzf2, and Tbx2, functioning as either a transcriptional activator or repressor to regulate hair bundle formation and outer hair cell differentiation and maintenance.","method":"ChIP-seq, ATAC-seq, single-cell transcriptomics integration, Rfx3 conditional knockout mouse","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq with functional KO; preprint, single lab","pmids":["bio_10.1101_2024.09.24.614849"],"is_preprint":true}],"current_model":"RFX3 is a transcription factor that directly binds X-box motifs in promoters and enhancers of ciliogenesis genes (including intraflagellar transport and axonemal dynein genes) to drive assembly and elongation of both primary and motile cilia; it undergoes auto-S-fatty acylation at a conserved dimerization-domain cysteine to promote homodimerization and transcriptional activity; it interacts physically with FOXJ1 as a co-activator of ciliary gene programs, and with FOXN3/FOXN4 via a shared hydrophobic motif at its dimerization domain; beyond ciliogenesis, RFX3 directly regulates glucokinase and Glut-2 expression in pancreatic beta-cells, co-localizes with CREB at activity-dependent enhancers in neurons to facilitate activity-dependent transcription, and indirectly controls brain axon tract formation by modulating GLI3 repressor/activator balance and FGF8 expression."},"narrative":{"teleology":[{"year":2004,"claim":"Establishing RFX3 as a ciliogenesis transcription factor: Rfx3 knockout mice revealed that RFX3 is essential for nodal monocilia elongation and regulates the intraflagellar transport gene D2lic, placing RFX3 upstream of the cilia assembly machinery and linking it to left-right asymmetry determination.","evidence":"Rfx3 KO mouse with ultrastructural cilia analysis and RT-PCR for D2lic","pmids":["15121860"],"confidence":"High","gaps":["Whether RFX3 directly binds D2lic promoter was not tested","Role in motile versus primary cilia was unresolved","Downstream ciliogenesis targets beyond D2lic were unknown"]},{"year":2006,"claim":"Extending the ciliogenesis role to brain ependymal cells: Rfx3 deficiency caused failure of ciliated ependymal cell differentiation and hydrocephalus due to subcommissural organ agenesis, broadening RFX3's requirement beyond nodal cilia to multiciliated brain epithelia.","evidence":"Rfx3 KO mouse with ultrastructural, immunohistochemical, and RT-PCR analysis of brain ependyma","pmids":["16930429"],"confidence":"High","gaps":["Direct transcriptional targets in ependymal cells not identified","Whether hydrocephalus results from ciliary motility defects versus secretory defects was unclear"]},{"year":2007,"claim":"Revealing a pancreatic endocrine role: Rfx3 deficiency reduced insulin-, glucagon-, and ghrelin-producing islet cells, stunted primary cilia on islet cells, and impaired glucose tolerance, establishing RFX3 as a regulator of pancreatic endocrine differentiation.","evidence":"Rfx3 KO mouse with immunofluorescence, electron microscopy, and glucose tolerance testing","pmids":["17229940"],"confidence":"High","gaps":["Direct transcriptional targets in beta-cells were not identified","Whether the metabolic phenotype was cilia-dependent or cilia-independent was unresolved"]},{"year":2009,"claim":"Demonstrating direct promoter binding at motile cilia genes: ChIP showed RFX3 directly binds axonemal dynein gene promoters in brain multiciliated cells and regulates FOXJ1 expression, establishing a direct transcriptional mechanism for ciliary motility control.","evidence":"ChIP in primary Rfx3 KO mouse brain cell cultures with cilia beat frequency measurements","pmids":["19671664"],"confidence":"High","gaps":["Whether RFX3 and FOXJ1 function in a shared complex was unknown","Genome-wide target repertoire was not mapped"]},{"year":2010,"claim":"Identifying direct beta-cell targets: RFX3 was shown to directly bind the glucokinase neuroendocrine promoter (Pal-1/Pal-2 sites) and regulate glucokinase and Glut-2 expression, mechanistically linking RFX3 to glucose-stimulated insulin secretion independently of cilia.","evidence":"ChIP-seq, EMSA, RNAi in Min6 cells, and pancreas-specific conditional KO","pmids":["20413507"],"confidence":"High","gaps":["Full set of RFX3 beta-cell targets beyond glucokinase/Glut-2 was not defined","Whether cilia-dependent signaling also contributes to the beta-cell phenotype was unresolved"]},{"year":2012,"claim":"Uncovering an indirect role in brain axon guidance: RFX3 deficiency disrupted corpus callosum formation by altering GLI3 repressor/activator balance and causing ectopic FGF8 expression at the cortical-septal boundary, demonstrating a cilia-signaling-dependent mechanism for axon tract patterning.","evidence":"Rfx3 conditional KO, transplantation assays, brain explant FGF8 phenocopy, GLI3 isoform analysis","pmids":["22479201"],"confidence":"High","gaps":["How RFX3/cilia control GLI3 processing was not resolved at the molecular level","Whether other Hedgehog-dependent brain structures are similarly affected was not tested"]},{"year":2013,"claim":"Establishing physical interaction with FOXJ1: Co-immunoprecipitation and promoter assays showed RFX3 physically associates with FOXJ1 and acts as a transcriptional co-activator of ciliary genes, explaining how RFX3 enhances but cannot independently drive cilia gene expression.","evidence":"Reciprocal co-IP and promoter-reporter assays in primary human airway basal cells","pmids":["23822649"],"confidence":"High","gaps":["The structural basis for the RFX3-FOXJ1 interaction was unknown","Whether the interaction is required in vivo was not tested"]},{"year":2018,"claim":"Discovering auto-S-fatty acylation as a regulatory mechanism: RFX3 was shown to undergo enzyme-independent auto-acylation at a conserved dimerization-domain cysteine, and this modification is required for homodimerization, ciliary gene expression, ciliogenesis, and Hedgehog signaling, revealing a novel post-translational activation mechanism for an RFX family member.","evidence":"Chemical reporters, mass spectrometry, active-site mutagenesis, ciliogenesis and Hedgehog reporter assays","pmids":["30127002"],"confidence":"High","gaps":["Whether fatty acylation is dynamically regulated in vivo is unknown","Structural consequences of acylation on the dimerization domain were not resolved","Whether other RFX family members undergo similar auto-acylation was not determined"]},{"year":2024,"claim":"Defining a shared FOX-family interaction motif: A conserved LXXLXWL motif in FOXJ1, FOXN3, and FOXN4 was shown to mediate binding to the RFX3 dimerization domain, enabling transcriptional activation (FOXN4) or repression (FOXN3) of cilia genes, expanding the combinatorial logic of RFX3-mediated transcription.","evidence":"Co-IP with domain mutagenesis, CUT&RUN, transcriptional reporter assays, AlphaFold3 structural prediction (preprint)","pmids":["bio_10.1101_2024.10.28.620684"],"confidence":"Medium","gaps":["Awaits peer review","In vivo functional validation of the motif mutants is lacking","Whether the interaction interface overlaps with the acylation site was not tested"]},{"year":2025,"claim":"Extending RFX3's role to human pancreatic islet differentiation: CRISPR KO in iPSC-derived islet organoids confirmed RFX3 is required for human beta-cell differentiation and insulin secretion, with overexpression rescuing the phenotype, validating the mouse findings in a human model.","evidence":"CRISPR/Cas9 RFX3 KO in human iPSCs, islet organoid differentiation, scRNA-seq, glucose-stimulated insulin secretion, overexpression rescue","pmids":["40263183"],"confidence":"High","gaps":["Direct RFX3 targets in human islet cells were not mapped genome-wide","Whether the enterochromaffin cell fate switch is cilia-dependent is unknown"]},{"year":2025,"claim":"Revealing a role in activity-dependent neuronal transcription: RFX3 loss in human iPSC-derived neurons impaired activity-dependent gene expression; RFX3 and CREB co-occupy activity-dependent enhancers, and RFX3 deficiency reduces CREB binding, suggesting RFX3 facilitates CREB-dependent chromatin access at stimulus-responsive loci.","evidence":"RFX3 KO/het iPSC-derived neurons, ChIP-seq, transcriptomics, depolarization assays; proximity labeling (BioID) and ChIP-seq in rodent neurons (preprints)","pmids":["40060598","40631264"],"confidence":"Medium","gaps":["Both studies are preprints awaiting peer review","Whether RFX3 directly contacts CREB/CRTC1 or acts through chromatin remodeling is unresolved","Causal contribution of RFX3 to neuronal activity phenotypes in vivo is not established"]},{"year":null,"claim":"Key unresolved questions include the structural basis for RFX3 auto-acylation and its dynamic regulation in vivo, the full genome-wide target repertoire across cell types, and whether RFX3's cilia-independent functions (beta-cell metabolism, neuronal activity-dependent transcription) represent a broader non-ciliary transcriptional program.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of RFX3 dimerization domain with acylation","Genome-wide target comparison across ciliated vs non-ciliated cell types is lacking","In vivo relevance of RFX3-CREB interaction for neuronal function is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,4,9,14]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,4,6,8,13,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,4,8,10]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,3,4,6,8,10,13,14]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,2,5,7]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,3,8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,8]}],"complexes":[],"partners":["FOXJ1","FOXN3","FOXN4","CREB1","CRTC1","RFX1"],"other_free_text":[]},"mechanistic_narrative":"RFX3 is a transcription factor that binds X-box motifs to orchestrate ciliogenesis, neuroendocrine cell differentiation, and activity-dependent neuronal gene expression. It directly activates intraflagellar transport and axonemal dynein genes required for both primary and motile cilia assembly and motility, and it physically interacts with FOXJ1 as a co-activator and with FOXN3/FOXN4 via a conserved hydrophobic motif in its dimerization domain to modulate ciliary gene programs [PMID:15121860, PMID:19671664, PMID:23822649]. RFX3 undergoes auto-S-fatty acylation at a conserved dimerization-domain cysteine, which is required for homodimerization, transcriptional activity, ciliogenesis, and Hedgehog signaling [PMID:30127002]. Beyond ciliogenesis, RFX3 directly regulates glucokinase and Glut-2 in pancreatic beta-cells to control glucose-stimulated insulin secretion, is essential for pancreatic islet cell differentiation, and co-localizes with CREB at activity-dependent enhancers in neurons to facilitate stimulus-dependent transcription [PMID:20413507, PMID:40263183, PMID:40060598]."},"prefetch_data":{"uniprot":{"accession":"P48380","full_name":"Transcription factor RFX3","aliases":["Regulatory factor X 3"],"length_aa":749,"mass_kda":83.5,"function":"Transcription factor required for ciliogenesis and islet cell differentiation during endocrine pancreas development. Essential for the differentiation of nodal monocilia and left-right asymmetry specification during embryogenesis. Required for the biogenesis of motile cilia by governing growth and beating efficiency of motile cells. Also required for ciliated ependymal cell differentiation. Regulates the expression of genes involved in ciliary assembly (DYNC2LI1, FOXJ1 and BBS4) and genes involved in ciliary motility (DNAH11, DNAH9 and DNAH5) (By similarity). Together with RFX6, participates in the differentiation of 4 of the 5 islet cell types during endocrine pancreas development, with the exception of pancreatic PP (polypeptide-producing) cells. Regulates transcription by forming a heterodimer with another RFX protein and binding to the X-box in the promoter of target genes (PubMed:20148032). Represses transcription of MAP1A in non-neuronal cells but not in neuronal cells (PubMed:12411430)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P48380/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RFX3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RFX3","total_profiled":1310},"omim":[{"mim_id":"612659","title":"REGULATORY FACTOR X, 6; RFX6","url":"https://www.omim.org/entry/612659"},{"mim_id":"604110","title":"ADHESION G PROTEIN-COUPLED RECEPTOR G1; ADGRG1","url":"https://www.omim.org/entry/604110"},{"mim_id":"601337","title":"REGULATORY FACTOR X, 3; RFX3","url":"https://www.omim.org/entry/601337"},{"mim_id":"600006","title":"REGULATORY FACTOR X, 1; RFX1","url":"https://www.omim.org/entry/600006"},{"mim_id":"165240","title":"GLI-KRUPPEL FAMILY MEMBER 3; GLI3","url":"https://www.omim.org/entry/165240"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":19.8}],"url":"https://www.proteinatlas.org/search/RFX3"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P48380","domains":[{"cath_id":"1.10.10.10","chopping":"158-266","consensus_level":"high","plddt":80.9528,"start":158,"end":266},{"cath_id":"-","chopping":"323-388_403-475","consensus_level":"high","plddt":91.1322,"start":323,"end":475},{"cath_id":"1.10.490","chopping":"516-662","consensus_level":"high","plddt":91.9803,"start":516,"end":662}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P48380","model_url":"https://alphafold.ebi.ac.uk/files/AF-P48380-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P48380-F1-predicted_aligned_error_v6.png","plddt_mean":66.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RFX3","jax_strain_url":"https://www.jax.org/strain/search?query=RFX3"},"sequence":{"accession":"P48380","fasta_url":"https://rest.uniprot.org/uniprotkb/P48380.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P48380/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P48380"}},"corpus_meta":[{"pmid":"15121860","id":"PMC_15121860","title":"The transcription factor RFX3 directs nodal cilium development and left-right asymmetry specification.","date":"2004","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15121860","citation_count":175,"is_preprint":false},{"pmid":"19671664","id":"PMC_19671664","title":"RFX3 governs growth and beating efficiency of motile cilia in mouse and controls the expression of genes involved in human ciliopathies.","date":"2009","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/19671664","citation_count":101,"is_preprint":false},{"pmid":"16930429","id":"PMC_16930429","title":"A deficiency in RFX3 causes hydrocephalus associated with abnormal differentiation of ependymal cells.","date":"2006","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/16930429","citation_count":92,"is_preprint":false},{"pmid":"17229940","id":"PMC_17229940","title":"Novel function of the ciliogenic transcription factor RFX3 in development of the endocrine pancreas.","date":"2007","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/17229940","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":"22479201","id":"PMC_22479201","title":"The ciliogenic transcription factor RFX3 regulates early midline distribution of guidepost neurons required for corpus callosum development.","date":"2012","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22479201","citation_count":61,"is_preprint":false},{"pmid":"20413507","id":"PMC_20413507","title":"The transcription factor Rfx3 regulates beta-cell differentiation, function, and glucokinase 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thalamocortical tract by regulating the patterning of prethalamus and ventral telencephalon.","date":"2015","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25631876","citation_count":23,"is_preprint":false},{"pmid":"31700260","id":"PMC_31700260","title":"Ginsenoside Rg3 and Korean Red Ginseng extract epigenetically regulate the tumor-related long noncoding RNAs RFX3-AS1 and STXBP5-AS1.","date":"2019","source":"Journal of ginseng research","url":"https://pubmed.ncbi.nlm.nih.gov/31700260","citation_count":22,"is_preprint":false},{"pmid":"29317724","id":"PMC_29317724","title":"RFX1 and RFX3 Transcription Factors Interact with the D Sequence of Adeno-Associated Virus Inverted Terminal Repeat and Regulate AAV Transduction.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/29317724","citation_count":8,"is_preprint":false},{"pmid":"35416616","id":"PMC_35416616","title":"CircRFX3 Up-regulates Its Host Gene RFX3 to Facilitate Tumorigenesis and Progression of Glioma.","date":"2022","source":"Journal of molecular neuroscience : MN","url":"https://pubmed.ncbi.nlm.nih.gov/35416616","citation_count":6,"is_preprint":false},{"pmid":"35997120","id":"PMC_35997120","title":"Downregulation of microRNA-342-3p Eases Insulin Resistance and Liver Gluconeogenesis via Regulating Rfx3 in Gestational Diabetes Mellitus.","date":"2022","source":"Critical reviews in eukaryotic gene expression","url":"https://pubmed.ncbi.nlm.nih.gov/35997120","citation_count":6,"is_preprint":false},{"pmid":"40060598","id":"PMC_40060598","title":"Multi-omic analysis of the ciliogenic transcription factor RFX3 reveals a role in promoting activity-dependent responses via enhancing CREB binding in human neurons.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40060598","citation_count":3,"is_preprint":false},{"pmid":"40263183","id":"PMC_40263183","title":"RFX3 is essential for the generation of functional human pancreatic islets from stem cells.","date":"2025","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/40263183","citation_count":2,"is_preprint":false},{"pmid":"40631264","id":"PMC_40631264","title":"Cytoplasmic and nuclear protein interaction networks of the synapto-nuclear messenger CRTC1 in neurons reveal cooperative chromatin binding between CREB1 and CRTC1, MEF2C and RFX3.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40631264","citation_count":1,"is_preprint":false},{"pmid":"42026014","id":"PMC_42026014","title":"Whole Genome Sequence Analysis of Weight Loss in 16 972 Participants With COPD Reveals Novel Risk Loci in DRAIC and RFX3.","date":"2026","source":"Journal of cachexia, sarcopenia and muscle","url":"https://pubmed.ncbi.nlm.nih.gov/42026014","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.02.27.640588","title":"Multi-omic analysis of the ciliogenic transcription factor <i>RFX3</i> reveals a role in promoting activity-dependent responses via enhancing CREB binding in human neurons","date":"2025-03-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.27.640588","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_2024.09.18.613711","title":"RFX3 is essential for the development and maturation of human pancreatic islets derived from pluripotent stem cells","date":"2024-09-19","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.18.613711","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.24.614849","title":"Rfx3 controls outer hair cell differentiation, maintenance, and hair bundle formation by regulating the expression of<i>Insm1, Ikzf2</i>, and<i>Triobp</i>genes","date":"2024-09-26","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.24.614849","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.07.23.25332035","title":"A Rare Variant in <i>TRIOBP</i> Linked to Occupational Noise Exposure in Meniere Disease","date":"2025-07-24","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.23.25332035","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.03.28.25324850","title":"Whole-Genome Sequencing Reveals Individual and Cohort Level Insights into Chromosome 9p Syndromes","date":"2025-03-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.28.25324850","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.30.602578","title":"Ciliary biology intersects autism and congenital heart disease","date":"2024-07-31","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.30.602578","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15385,"output_tokens":3713,"usd":0.050925},"stage2":{"model":"claude-opus-4-6","input_tokens":7110,"output_tokens":3211,"usd":0.173737},"total_usd":0.224662,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2004,\n      \"finding\": \"RFX3 is essential for the elongation of nodal monocilia during embryonic development; Rfx3-deficient mice exhibit stunted nodal cilia, leading to left-right asymmetry defects. RFX3 regulates expression of D2lic (mouse orthologue of a C. elegans intraflagellar transport gene), placing RFX3 upstream of intraflagellar transport in ciliogenesis.\",\n      \"method\": \"Rfx3 knockout mouse (loss-of-function), ultrastructural analysis of nodal cilia, RT-PCR for D2lic expression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and developmental phenotype, molecular target identified, replicated across multiple studies\",\n      \"pmids\": [\"15121860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RFX3 is required for differentiation of ciliated ependymal cells (including subcommissural organ and choroid plexus cells) in the mouse brain; Rfx3 deficiency causes hydrocephalus associated with agenesis of the subcommissural organ and downregulation of SCO-spondin expression.\",\n      \"method\": \"Rfx3 knockout mouse, ultrastructural analysis, immunohistochemistry, RT-PCR for SCO-spondin\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific cellular phenotype and molecular marker, well-controlled\",\n      \"pmids\": [\"16930429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RFX3 is expressed in pancreatic endocrine progenitors and all major islet cell lineages; Rfx3-deficient mice exhibit reduced insulin-, glucagon-, and ghrelin-producing cells, increased pancreatic polypeptide cells, stunted primary cilia on islet cells, and impaired glucose tolerance, demonstrating a role for RFX3 in pancreatic endocrine cell differentiation.\",\n      \"method\": \"Rfx3 knockout mouse, immunofluorescence, electron microscopy of primary cilia, glucose tolerance testing\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and functional phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"17229940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RFX3 is required for the growth and beating efficiency of motile cilia in multiciliated brain cells; RFX3 regulates FOXJ1 transcription factor expression and directly binds the promoters of axonemal dynein genes required for ciliary motility.\",\n      \"method\": \"Rfx3 knockout primary mouse brain cell cultures, ChIP (direct promoter binding), cilia beat frequency measurements\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP demonstrating direct promoter binding plus functional phenotype in primary KO cells, multiple methods\",\n      \"pmids\": [\"19671664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RFX3 is required for the differentiation and function of mature beta-cells; it directly binds the Pal-1 and Pal-2 regulatory sequences in the neuroendocrine promoter of the glucokinase gene, regulating glucokinase and Glut-2 expression and glucose-stimulated insulin secretion.\",\n      \"method\": \"Rfx3 knockout mouse, pancreas-specific conditional KO, RNA interference in Min6 cells, quantitative ChIP, ChIP sequencing, bandshift (EMSA) assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding demonstrated by ChIP-seq and EMSA, confirmed in multiple genetic models and cell lines\",\n      \"pmids\": [\"20413507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"RFX3 controls corpus callosum formation indirectly by regulating patterning of the cortical-septal boundary before E12.5, which leads to proper distribution of guidepost neurons; RFX3 deficiency results in ectopic FGF8 expression associated with a reduced GLI3 repressor-to-activator ratio, and ectopic FGF8 reproduces the guidepost neuron defects.\",\n      \"method\": \"Rfx3 knockout mouse, conditional genetic inactivation, transplantation assays, brain explant cultures with FGF8, GLI3 isoform analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via conditional KO plus functional rescue/phenocopy in explant cultures with multiple orthogonal methods\",\n      \"pmids\": [\"22479201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RFX3 physically interacts with FOXJ1 and acts as a transcriptional co-activator; combined FOXJ1+RFX3 transfection enhances ciliated gene promoter activity and mRNA expression beyond FOXJ1 alone in human airway basal cells, while RFX3 alone cannot induce cilia-related gene expression.\",\n      \"method\": \"Co-immunoprecipitation of FOXJ1 and RFX3, plasmid-mediated gene transfer in primary human airway basal cells, promoter-reporter assays, TaqMan PCR\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus functional promoter assays in primary human cells\",\n      \"pmids\": [\"23822649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RFX3 is required for proper formation of the thalamocortical tract by establishing the correct cellular environment in the ventral telencephalon; Rfx3 deficiency causes heterotopias expressing Slit1 and Netrin1 guidance cues, leading to aberrant thalamocortical axon projections; identical defects occur in Inpp5e mutants, indicating primary cilia signaling underlies tract formation.\",\n      \"method\": \"Rfx3 knockout mouse, DiI axon tracing, immunohistochemistry, genetic epistasis with Inpp5e mutants\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — axon tracing with defined phenotype, confirmed by independent ciliary mutant (epistasis)\",\n      \"pmids\": [\"25631876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RFX3 undergoes enzyme-independent auto-S-fatty acylation (preferentially by stearic and oleic acid) at a conserved cysteine in its dimerization domain; this modification promotes homodimerization, ciliary gene expression, ciliogenesis, cilia elongation, and Hedgehog signaling. A fatty acylation-deficient mutant fails in all these functions.\",\n      \"method\": \"Chemical reporters of protein fatty acylation, mass spectrometry, active-site mutagenesis, dimerization assays, ciliogenesis assays, Hedgehog signaling reporters\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical demonstration of auto-acylation, mutagenesis of active site, multiple functional readouts\",\n      \"pmids\": [\"30127002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RFX1 homodimers and RFX1/RFX3 heterodimers bind specifically to the double-stranded D sequence of AAV inverted terminal repeats, and RFX proteins can be pulled down with the AAV genome in transduced HEK-293 cells, indicating RFX3 acts as a regulator of AAV-mediated transgene expression.\",\n      \"method\": \"Electromobility shift assay (EMSA), supershift experiments, co-immunoprecipitation/pulldown with AAV genome from transduced cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — EMSA with supershift and pulldown from cells, but limited functional follow-up\",\n      \"pmids\": [\"29317724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In human iPSC-derived neurons, monoallelic RFX3 loss diminishes neuronal activity-dependent gene expression; RFX3 binding sites co-localize with CREB binding sites near activity-dependent genes, and RFX3 deficiency leads to decreased CREB binding and impaired induction of CREB targets upon neuronal depolarization.\",\n      \"method\": \"iPSC-derived neurons and forebrain organoids with biallelic or monoallelic RFX3 loss, transcriptomics, ChIP-seq/DNA binding analysis, neuronal depolarization assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq and transcriptomics in human neurons with loss-of-function; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"40060598\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRTC1 and CREB1 interact with RFX3 in an activity-dependent manner in rodent forebrain neurons; glutamatergic stimulation recruits CRTC1 and CREB1 to activity-dependent enhancers enriched in RFX3 motifs, indicating cooperative chromatin binding between CREB1 and RFX3 at activity-dependent loci.\",\n      \"method\": \"Proximity labeling (BioID) in rodent forebrain neurons, ChIP-seq, neuronal activity stimulation assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proximity labeling plus ChIP-seq; preprint, single lab\",\n      \"pmids\": [\"40631264\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A short hydrophobic motif (LXXLXWL) shared by FOXJ1, FOXN4, and FOXN3 is required for physical association with the RFX3 dimerization domain; mutations in RFX3 at the predicted interaction site disrupted association with FOXN3 or FOXN4, and this interaction mediates both transcriptional repression (by FOXN3) and activation (by FOXN4) of cilia genes.\",\n      \"method\": \"CUT&RUN chromatin profiling, co-immunoprecipitation, domain mutagenesis, AlphaFold3 structural prediction, in vitro transcriptional reporter assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical co-IP with mutagenesis and functional reporter assays; preprint\",\n      \"pmids\": [\"bio_10.1101_2024.10.28.620684\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RFX3 is required for human pancreatic islet cell differentiation; RFX3 knockout in iPSC-derived islet organoids reduces hormone-secreting cells, impairs beta-cell function and insulin secretion, and leads to increased enterochromaffin cell specification; RFX3 overexpression rescues dysregulated gene expression.\",\n      \"method\": \"CRISPR/Cas9 RFX3 KO in iPSCs, pancreatic islet organoid differentiation, single-cell RNA-seq, bulk RNA-seq, glucose-stimulated insulin secretion assay, RFX3 overexpression rescue\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with rescue, multiple orthogonal methods in human stem cell model\",\n      \"pmids\": [\"40263183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In cochlear outer hair cells, Rfx3 binds intronic enhancers of Triobp and regulatory regions of Insm1, Ikzf2, and Tbx2, functioning as either a transcriptional activator or repressor to regulate hair bundle formation and outer hair cell differentiation and maintenance.\",\n      \"method\": \"ChIP-seq, ATAC-seq, single-cell transcriptomics integration, Rfx3 conditional knockout mouse\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq with functional KO; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.09.24.614849\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RFX3 is a transcription factor that directly binds X-box motifs in promoters and enhancers of ciliogenesis genes (including intraflagellar transport and axonemal dynein genes) to drive assembly and elongation of both primary and motile cilia; it undergoes auto-S-fatty acylation at a conserved dimerization-domain cysteine to promote homodimerization and transcriptional activity; it interacts physically with FOXJ1 as a co-activator of ciliary gene programs, and with FOXN3/FOXN4 via a shared hydrophobic motif at its dimerization domain; beyond ciliogenesis, RFX3 directly regulates glucokinase and Glut-2 expression in pancreatic beta-cells, co-localizes with CREB at activity-dependent enhancers in neurons to facilitate activity-dependent transcription, and indirectly controls brain axon tract formation by modulating GLI3 repressor/activator balance and FGF8 expression.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RFX3 is a transcription factor that binds X-box motifs to orchestrate ciliogenesis, neuroendocrine cell differentiation, and activity-dependent neuronal gene expression. It directly activates intraflagellar transport and axonemal dynein genes required for both primary and motile cilia assembly and motility, and it physically interacts with FOXJ1 as a co-activator and with FOXN3/FOXN4 via a conserved hydrophobic motif in its dimerization domain to modulate ciliary gene programs [PMID:15121860, PMID:19671664, PMID:23822649]. RFX3 undergoes auto-S-fatty acylation at a conserved dimerization-domain cysteine, which is required for homodimerization, transcriptional activity, ciliogenesis, and Hedgehog signaling [PMID:30127002]. Beyond ciliogenesis, RFX3 directly regulates glucokinase and Glut-2 in pancreatic beta-cells to control glucose-stimulated insulin secretion, is essential for pancreatic islet cell differentiation, and co-localizes with CREB at activity-dependent enhancers in neurons to facilitate stimulus-dependent transcription [PMID:20413507, PMID:40263183, PMID:40060598].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing RFX3 as a ciliogenesis transcription factor: Rfx3 knockout mice revealed that RFX3 is essential for nodal monocilia elongation and regulates the intraflagellar transport gene D2lic, placing RFX3 upstream of the cilia assembly machinery and linking it to left-right asymmetry determination.\",\n      \"evidence\": \"Rfx3 KO mouse with ultrastructural cilia analysis and RT-PCR for D2lic\",\n      \"pmids\": [\"15121860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RFX3 directly binds D2lic promoter was not tested\", \"Role in motile versus primary cilia was unresolved\", \"Downstream ciliogenesis targets beyond D2lic were unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Extending the ciliogenesis role to brain ependymal cells: Rfx3 deficiency caused failure of ciliated ependymal cell differentiation and hydrocephalus due to subcommissural organ agenesis, broadening RFX3's requirement beyond nodal cilia to multiciliated brain epithelia.\",\n      \"evidence\": \"Rfx3 KO mouse with ultrastructural, immunohistochemical, and RT-PCR analysis of brain ependyma\",\n      \"pmids\": [\"16930429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in ependymal cells not identified\", \"Whether hydrocephalus results from ciliary motility defects versus secretory defects was unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealing a pancreatic endocrine role: Rfx3 deficiency reduced insulin-, glucagon-, and ghrelin-producing islet cells, stunted primary cilia on islet cells, and impaired glucose tolerance, establishing RFX3 as a regulator of pancreatic endocrine differentiation.\",\n      \"evidence\": \"Rfx3 KO mouse with immunofluorescence, electron microscopy, and glucose tolerance testing\",\n      \"pmids\": [\"17229940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in beta-cells were not identified\", \"Whether the metabolic phenotype was cilia-dependent or cilia-independent was unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating direct promoter binding at motile cilia genes: ChIP showed RFX3 directly binds axonemal dynein gene promoters in brain multiciliated cells and regulates FOXJ1 expression, establishing a direct transcriptional mechanism for ciliary motility control.\",\n      \"evidence\": \"ChIP in primary Rfx3 KO mouse brain cell cultures with cilia beat frequency measurements\",\n      \"pmids\": [\"19671664\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RFX3 and FOXJ1 function in a shared complex was unknown\", \"Genome-wide target repertoire was not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying direct beta-cell targets: RFX3 was shown to directly bind the glucokinase neuroendocrine promoter (Pal-1/Pal-2 sites) and regulate glucokinase and Glut-2 expression, mechanistically linking RFX3 to glucose-stimulated insulin secretion independently of cilia.\",\n      \"evidence\": \"ChIP-seq, EMSA, RNAi in Min6 cells, and pancreas-specific conditional KO\",\n      \"pmids\": [\"20413507\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of RFX3 beta-cell targets beyond glucokinase/Glut-2 was not defined\", \"Whether cilia-dependent signaling also contributes to the beta-cell phenotype was unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Uncovering an indirect role in brain axon guidance: RFX3 deficiency disrupted corpus callosum formation by altering GLI3 repressor/activator balance and causing ectopic FGF8 expression at the cortical-septal boundary, demonstrating a cilia-signaling-dependent mechanism for axon tract patterning.\",\n      \"evidence\": \"Rfx3 conditional KO, transplantation assays, brain explant FGF8 phenocopy, GLI3 isoform analysis\",\n      \"pmids\": [\"22479201\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RFX3/cilia control GLI3 processing was not resolved at the molecular level\", \"Whether other Hedgehog-dependent brain structures are similarly affected was not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing physical interaction with FOXJ1: Co-immunoprecipitation and promoter assays showed RFX3 physically associates with FOXJ1 and acts as a transcriptional co-activator of ciliary genes, explaining how RFX3 enhances but cannot independently drive cilia gene expression.\",\n      \"evidence\": \"Reciprocal co-IP and promoter-reporter assays in primary human airway basal cells\",\n      \"pmids\": [\"23822649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The structural basis for the RFX3-FOXJ1 interaction was unknown\", \"Whether the interaction is required in vivo was not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovering auto-S-fatty acylation as a regulatory mechanism: RFX3 was shown to undergo enzyme-independent auto-acylation at a conserved dimerization-domain cysteine, and this modification is required for homodimerization, ciliary gene expression, ciliogenesis, and Hedgehog signaling, revealing a novel post-translational activation mechanism for an RFX family member.\",\n      \"evidence\": \"Chemical reporters, mass spectrometry, active-site mutagenesis, ciliogenesis and Hedgehog reporter assays\",\n      \"pmids\": [\"30127002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether fatty acylation is dynamically regulated in vivo is unknown\", \"Structural consequences of acylation on the dimerization domain were not resolved\", \"Whether other RFX family members undergo similar auto-acylation was not determined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defining a shared FOX-family interaction motif: A conserved LXXLXWL motif in FOXJ1, FOXN3, and FOXN4 was shown to mediate binding to the RFX3 dimerization domain, enabling transcriptional activation (FOXN4) or repression (FOXN3) of cilia genes, expanding the combinatorial logic of RFX3-mediated transcription.\",\n      \"evidence\": \"Co-IP with domain mutagenesis, CUT&RUN, transcriptional reporter assays, AlphaFold3 structural prediction (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.10.28.620684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Awaits peer review\", \"In vivo functional validation of the motif mutants is lacking\", \"Whether the interaction interface overlaps with the acylation site was not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extending RFX3's role to human pancreatic islet differentiation: CRISPR KO in iPSC-derived islet organoids confirmed RFX3 is required for human beta-cell differentiation and insulin secretion, with overexpression rescuing the phenotype, validating the mouse findings in a human model.\",\n      \"evidence\": \"CRISPR/Cas9 RFX3 KO in human iPSCs, islet organoid differentiation, scRNA-seq, glucose-stimulated insulin secretion, overexpression rescue\",\n      \"pmids\": [\"40263183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct RFX3 targets in human islet cells were not mapped genome-wide\", \"Whether the enterochromaffin cell fate switch is cilia-dependent is unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealing a role in activity-dependent neuronal transcription: RFX3 loss in human iPSC-derived neurons impaired activity-dependent gene expression; RFX3 and CREB co-occupy activity-dependent enhancers, and RFX3 deficiency reduces CREB binding, suggesting RFX3 facilitates CREB-dependent chromatin access at stimulus-responsive loci.\",\n      \"evidence\": \"RFX3 KO/het iPSC-derived neurons, ChIP-seq, transcriptomics, depolarization assays; proximity labeling (BioID) and ChIP-seq in rodent neurons (preprints)\",\n      \"pmids\": [\"40060598\", \"40631264\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Both studies are preprints awaiting peer review\", \"Whether RFX3 directly contacts CREB/CRTC1 or acts through chromatin remodeling is unresolved\", \"Causal contribution of RFX3 to neuronal activity phenotypes in vivo is not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for RFX3 auto-acylation and its dynamic regulation in vivo, the full genome-wide target repertoire across cell types, and whether RFX3's cilia-independent functions (beta-cell metabolism, neuronal activity-dependent transcription) represent a broader non-ciliary transcriptional program.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of RFX3 dimerization domain with acylation\", \"Genome-wide target comparison across ciliated vs non-ciliated cell types is lacking\", \"In vivo relevance of RFX3-CREB interaction for neuronal function is untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 4, 9, 14]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 4, 6, 8, 13, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 4, 8, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 3, 4, 6, 8, 10, 13, 14]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 2, 5, 7]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 3, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"FOXJ1\",\n      \"FOXN3\",\n      \"FOXN4\",\n      \"CREB1\",\n      \"CRTC1\",\n      \"RFX1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}