{"gene":"RFX1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1989,"finding":"EF-C (RFX1) binds to an inverted repeat (5'-GTTGCNNNGCAAC-3') within the hepatitis B virus and polyomavirus enhancer regions; diethyl pyrocarbonate interference and competition assays showed it contacts symmetrical nucleotides within the inverted repeat; spacer-length mutagenesis showed that altering spacing by ≥3 bp abolishes binding, suggesting binding is stabilized by dimerization.","method":"In vitro binding assays, diethyl pyrocarbonate interference, competition binding with mutant sites, in vivo enhancer function assays with spacer mutants","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal in vitro biochemical assays with mutagenesis plus in vivo functional validation in a single rigorous study","pmids":["2550788"],"is_preprint":false},{"year":1991,"finding":"EF-C (RFX1) exhibits methylation-dependent DNA binding: it binds certain DNA sites only when CpG dinucleotides are methylated (m5C), while other sites are bound in a methylation-independent manner; EF-C was concluded to correspond to the methylation-dependent DNA-binding protein MDBP.","method":"In vitro binding assays with methylated and unmethylated DNA substrates","journal":"Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical characterization with defined substrates, single lab but multiple binding site comparisons","pmids":["1850932"],"is_preprint":false},{"year":1993,"finding":"RFX1 is identical to the enhancer factor EF-C; RFX1-specific antisense oligonucleotides inhibit hepatitis B virus enhancer I (EnhI)-driven expression of HBV major surface antigen in HepG2 cells, and RFX1 acts as a transactivator of EnhI in transfection assays; transactivation is not observed in non-liver cell lines, indicating cooperation with liver-specific factors.","method":"Antisense oligonucleotide knockdown, transfection-based reporter assays, EMSA","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — identity confirmed and functional role validated by antisense knockdown plus transactivation assay in multiple cell lines; replicated/consistent with PMID:8289803","pmids":["8413236"],"is_preprint":false},{"year":1993,"finding":"RFX1 belongs to a novel family of homodimeric and heterodimeric DNA-binding proteins (RFX1, RFX2, RFX3); RFX proteins heterodimerize both in vitro and in vivo; they share five conserved regions including two domains required for DNA binding and dimerization; they have a peculiar dependence on methylated CpG dinucleotides at certain binding sites.","method":"Cloning, EMSA, in vitro and in vivo heterodimerization assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical characterization of dimerization in vitro and in vivo with domain mapping; foundational study replicated across subsequent work","pmids":["8289803"],"is_preprint":false},{"year":1993,"finding":"RFX1 (EF-C) is required for efficient HBV enhancer I function but the EF-C site does not possess intrinsic enhancer activity alone; it functions synergistically with the adjacent GB element; HNF-4 transactivates via the GB element in an EF-C-site-dependent manner; RXRα transactivates via GB in response to retinoic acid largely EF-C-independently; COUP-TF antagonizes GB element activity in liver cells.","method":"In vitro binding assays (EMSA), transfection-based reporter assays, mutational analysis","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional dissection experiments with cooperating factors, single lab","pmids":["8389913"],"is_preprint":false},{"year":1993,"finding":"RFX1 binds to the alpha element of the mouse rpL30 promoter; a mutation abolishing RFX1 binding reduces rpL30 promoter activity to ~43% of wild-type, indicating RFX1 plays an important role in rpL30 promoter strength.","method":"EMSA competition assay, antibody supershift, promoter activity assay with mutant alpha element","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA plus mutagenesis plus reporter assay; single lab","pmids":["8224874"],"is_preprint":false},{"year":1995,"finding":"MIBP1 and RFX1 associate in vivo to form a complex; both are present in DNA-protein complexes at the c-myc MIF-1 element, the MHC class II X-box, and the HBV EP element; tandem repeats of the MIBP1/RFX1-binding site can function as silencers in HepG2 and HeLa cells.","method":"Co-immunoprecipitation, EMSA with antibody supershift, reporter silencer assays","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and EMSA supershift in vivo; single lab","pmids":["7760800"],"is_preprint":false},{"year":1995,"finding":"Intact interaction of EF-C/RFX1 with a full inverted repeat is required for transactivation of the HBV and polyomavirus enhancers; binding to the MHC class II DRA promoter represents unstable half-site interaction, suggesting an additional activity is required to stabilize RFX1 at MHC class II promoters.","method":"EMSA with purified protein and mutant binding sites, chemical footprinting, modification interference assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — purified protein, multiple in vitro biochemical assays with mutagenesis and footprinting; single lab","pmids":["7713944"],"is_preprint":false},{"year":1995,"finding":"RFX1 (EF-C) associates with the PCNA E1A-responsive element (PERE) as the major component of the P1 complex; ATF-1 is a major component of the P2/P3 complexes; their binding was demonstrated by antibody interference EMSA and in vitro-synthesized protein assays.","method":"EMSA, antibody interference/supershift, in vitro protein synthesis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — antibody supershift plus in vitro protein; single lab","pmids":["7479004"],"is_preprint":false},{"year":1996,"finding":"MIBP1 and RFX1 both bind to the EP element of HBV enhancer I; the EP element alone can repress transcription of an SV40 promoter in a position- and orientation-independent manner (silencer function) in hepatocarcinoma cells.","method":"EMSA with antibody supershift, reporter repression assays","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA and reporter assay; single lab","pmids":["8709229"],"is_preprint":false},{"year":1997,"finding":"RFX1 contains an N-terminal activation domain with a glutamine-rich region and a C-terminal repressor domain overlapping the dimerization domain; these activities mutually neutralize each other in the intact protein, producing a nearly inactive transcription factor; relief of self-neutralization can allow RFX1 to act as a dual-function regulator.","method":"Deletion mutant analysis, chimeric protein assays, transcriptional activity assays in transfected cells","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic deletion and chimeric mutant functional dissection with multiple constructs; single lab but comprehensive","pmids":["9278482"],"is_preprint":false},{"year":1997,"finding":"RFX1 can bind to the NRE gamma subregion of the HBV core promoter and transactivate through this site; RFX1 can bind simultaneously with MIBP1 to NRE gamma, most likely as a heterodimer; mutations abolishing NRE gamma silencing also prevent RFX1 binding.","method":"EMSA, mutational analysis, transcriptional reporter assays","journal":"Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA with mutagenesis plus reporter assay; single lab","pmids":["9018153"],"is_preprint":false},{"year":1998,"finding":"RFX1 possesses a split, extended dimerization domain composed of several conserved boxes; it generates two alternative homodimeric DNA-protein complexes (a canonical complex and a novel low-mobility complex formed only with palindromic DNA); formation of the low-mobility complex correlates with transcriptional repression; different deletions within the dimerization domain alter the relative abundance of the two complexes.","method":"EMSA with deletion mutants, transcriptional repression assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic deletion mutagenesis correlating complex formation with repression; single lab","pmids":["9733744"],"is_preprint":false},{"year":1999,"finding":"Mutations within the RFX1 consensus binding site in the human PCNA PERE reduce RFX1 binding and increase PCNA transcriptional activity; mutations that increase RFX1 binding reduce PCNA promoter activity; RFX1 plays an inhibitory role in PCNA gene regulation.","method":"EMSA with site-directed mutants, transient transfection reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA mutagenesis correlated with reporter activity; single lab","pmids":["10336433"],"is_preprint":false},{"year":1999,"finding":"The C-terminal dimerization domain of RFX1 is conserved with yeast RFX orthologues Sak1 (S. pombe) and Crt1 (S. cerevisiae); the ability to generate two alternative homodimeric complexes is conserved across species; dimerization and repression capacity differs: RFX1 > Sak1 > Crt1.","method":"Domain swap/chimeric protein constructs, EMSA, Gal4-fusion transcriptional assays","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — chimeric protein analysis with EMSA and transcriptional assays; single lab","pmids":["10556033"],"is_preprint":false},{"year":2000,"finding":"Activation of protein kinase C (PKC) by PMA or bryostatin 1 induces nuclear translocation of RFX1 without altering total RFX1 levels; nuclear RFX1 binds to the c-myc intron 1 X box (MIE1); this binding is required for down-regulation of c-myc reporter expression; PKC inhibition abolishes both nuclear translocation and c-myc repression.","method":"Nuclear/cytosolic fractionation, EMSA with antibody supershift, reporter gene assays with X box mutations, specific PKC inhibitor","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation plus EMSA plus reporter mutagenesis with pharmacological controls, multiple orthogonal methods; single lab","pmids":["10918054"],"is_preprint":false},{"year":2001,"finding":"RFX1 contains a nonclassical nuclear localization signal (NLS) at its extreme C-terminus; the adjacent acidic region potentiates NLS function but also inhibits nuclear DNA-binding activity, suggesting an autoinhibitory mechanism; the DNA-binding domain mediates tight nuclear association; the dimerization domain enhances nuclear association; phosphorylation by kinases such as PKC may coordinately regulate nuclear import and DNA binding.","method":"Confocal fluorescence microscopy of deletion constructs, subcellular fractionation, domain mapping","journal":"European journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by confocal microscopy with multiple domain deletion constructs and fractionation; single lab","pmids":["11358531"],"is_preprint":false},{"year":2003,"finding":"RFX1 binds to P sequence element A (PSE-A) within the human GH locus 263P repressor element; disruption of the RFX1 site blunts repressor activity; RFX1 and NF-1 family members co-immunoprecipitate and both associate with P sequences in human pituitary tissue chromatin; association of these factors inversely correlates with CS promoter histone hyperacetylation.","method":"EMSA, reporter assays with mutant PSE-A, co-immunoprecipitation, chromatin immunoprecipitation from human pituitary tissue","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP in native tissue plus Co-IP plus reporter assay; single lab","pmids":["12624117"],"is_preprint":false},{"year":2010,"finding":"RFX1 recruits co-repressors DNMT1 and HDAC1 to the CD11a and CD70 promoters in CD4+ T cells, causing DNA methylation and histone deacetylation and repressing their expression; reduced RFX1 in SLE CD4+ T cells causes loss of these epigenetic marks and CD11a/CD70 overexpression.","method":"ChIP assay, RFX1 overexpression and knockdown in CD4+ T cells, flow cytometry for surface marker expression","journal":"Journal of autoimmunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating recruitment plus gain- and loss-of-function with functional readout; replicated in subsequent work (PMID:21192791)","pmids":["20223637"],"is_preprint":false},{"year":2010,"finding":"RFX1 binds 18-bp cis-elements of the FGF1 gene 1B promoter and negatively regulates FGF1-B mRNA expression and neurosphere formation in glioblastoma cells; RFX1 overexpression suppresses neurosphere formation while RFX1 knockdown increases it.","method":"Yeast one-hybrid assay, EMSA, ChIP, gain- and loss-of-function assays, neurosphere assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (yeast one-hybrid, EMSA, ChIP, functional assays) in single study","pmids":["20189986"],"is_preprint":false},{"year":2010,"finding":"RFX1 recruits the histone methyltransferase SUV39H1 to the CD11a and CD70 promoters in CD4+ T cells, regulating H3K9 tri-methylation; co-immunoprecipitation confirmed RFX1-SUV39H1 interaction; RFX1 levels correlate with H3K9me3 at these promoters.","method":"Co-immunoprecipitation, Western blot, immunofluorescence, ChIP with real-time PCR, RFX1 overexpression/knockdown","journal":"Arthritis research & therapy","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus ChIP plus gain/loss-of-function; corroborates PMID:20223637 with an additional co-repressor","pmids":["21192791"],"is_preprint":false},{"year":2005,"finding":"RFX-1 specifically interacts with alpha Adducin in a yeast two-hybrid screen; interaction was confirmed in cells by co-immunoprecipitation and colocalization; alpha Adducin and RFX-1 co-localize in the nucleus, suggesting Adducin may modulate RFX-1 transcriptional activity.","method":"Yeast two-hybrid, co-immunoprecipitation, colocalization microscopy","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single Co-IP with no functional follow-up on RFX1 activity","pmids":["16289097"],"is_preprint":false},{"year":2016,"finding":"RFX1 protein is degraded by polyubiquitination-mediated proteasomal degradation; the E3 ubiquitin ligase STUB1 mediates this degradation; STUB1 is upregulated in SLE CD4+ T cells; STUB1 overexpression leads to elevated CD70 and CD11a levels consistent with reduced RFX1.","method":"Co-immunoprecipitation, ubiquitination assay, STUB1 overexpression","journal":"Clinical immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional ubiquitination assay identifying the E3 ligase; single lab","pmids":["27283392"],"is_preprint":false},{"year":2018,"finding":"RFX1 represses IL-17A expression by recruiting repressive epigenetic marks (decreased H3 acetylation, increased DNA methylation, and increased H3K9 tri-methylation) at the IL17A promoter in CD4+ T cells; phosphorylated STAT3 inhibits RFX1 expression, placing RFX1 downstream of IL-6/STAT3 signaling in a non-canonical pathway regulating Th17 differentiation; conditional Rfx1 deletion in mice increases Th17 cell induction.","method":"ChIP, reporter assays, conditional Rfx1 knockout mice, in vitro Th17 differentiation assays, forced RFX1 re-expression","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic (conditional KO) plus ChIP plus in vitro reconstitution plus overexpression rescue; multiple orthogonal methods","pmids":["29422534"],"is_preprint":false},{"year":2018,"finding":"RFX1 directly binds the HBV enhancer I EP element; doxorubicin increases RFX1 expression and its binding to HBV enhancer I; knocking down endogenous RFX1 or mutating the EP element significantly attenuates doxorubicin-promoted HBV replication.","method":"ChIP, siRNA knockdown, EP element mutagenesis, HBV replication assay","journal":"Cancer medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus KD plus mutagenesis; single lab","pmids":["29601674"],"is_preprint":false},{"year":2019,"finding":"RFX1 directly represses TLR4 transcription in CD14+ monocytes by recruiting DNMT1, HDAC1, and SUV39H1 to the TLR4 promoter, maintaining DNA methylation and H3K9 tri-methylation and limiting H3/H4 acetylation; RFX1 knockdown causes TLR4 overexpression and monocyte activation.","method":"ChIP, RFX1 knockdown and overexpression, reporter assay, Western blot","journal":"Clinical epigenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus gain/loss-of-function; single lab, recapitulates mechanism established in T cells","pmids":["30857550"],"is_preprint":false},{"year":2019,"finding":"The C-terminal repression domain of RFX1 directly interacts with the catalytic subunit of protein phosphatase 1 (PP1c); RFX1 can recruit PP1c to specific genomic sites/promoters.","method":"Co-immunoprecipitation, chromatin recruitment assay","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP plus recruitment assay; single lab, minimal mechanistic follow-up","pmids":["30654936"],"is_preprint":false},{"year":2016,"finding":"RFX1 is specifically expressed in fetal Sertoli cells and is required for testis cord integrity; conditional Rfx1 knockout mice (Rfx1flox/flox, Amh-Cre) show fragmented basal lamina and blocked spermatogenesis; RFX1 directly activates transcription of Itga6 (integrin alpha-6) as shown by luciferase reporter and ChIP assays.","method":"Conditional knockout mouse model, histology, luciferase reporter assay, ChIP","journal":"Molecular reproduction and development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function in vivo plus direct target validation by ChIP and reporter assay; single lab","pmids":["27228460"],"is_preprint":false},{"year":2025,"finding":"KAT7 acetyltransferase mediates acetylation of RFX1; NgBR deficiency suppresses KAT7 expression, impairing KAT7-mediated RFX1 acetylation, which stabilizes RFX1 by blocking its proteasomal degradation, thereby increasing RFX1-mediated repression of FGF1 transcription.","method":"RNA sequencing, Western blot, KAT7 knockdown/overexpression, proteasome inhibitor assays, neuronal damage models","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — identification of acetylation writer (KAT7) with functional consequence on RFX1 stability and target gene; single lab","pmids":["40192836"],"is_preprint":false},{"year":2025,"finding":"The splicing factor RBM39 binds to RFX1 pre-mRNA (demonstrated by RIP-seq) and promotes skipping of exon 2 in HCC cells, producing an N-terminal truncated RFX1 isoform that loses transcriptional repression activity on collagen genes, thereby activating the FAK/PI3K/AKT integrin signaling pathway.","method":"RNA immunoprecipitation sequencing (RIP-seq), RBM39 silencing, alternative splicing analysis, functional signaling pathway assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq identifies direct pre-mRNA binding plus functional isoform characterization; single lab","pmids":["40033026"],"is_preprint":false},{"year":2024,"finding":"RFX1 directly represses CD36 transcription in macrophages (demonstrated by dual luciferase reporter assay); Rfx1 deficiency in myeloid cells (ApoE−/−Rfx1f/f Lyz2-Cre mice) aggravates atherosclerotic lesions; RFX1 loss increases foam cell formation via elevated CD36-mediated lipid uptake.","method":"Dual luciferase reporter assay, conditional myeloid Rfx1 knockout mice, RFX1 overexpression/silencing in macrophages, lipid uptake assays","journal":"International immunopharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model plus direct transcriptional target validation by reporter assay; multiple orthogonal methods","pmids":["38402833"],"is_preprint":false},{"year":2018,"finding":"RFX1 and RFX3 form homodimers and heterodimers that bind specifically to the double-stranded D sequence of AAV inverted terminal repeats (ITRs); these complexes can be pulled down bound to AAV genomes in transduced HEK-293 cells, and RFX proteins act as regulators of AAV-mediated transgene expression.","method":"EMSA, supershift with antibodies, AAV genome pulldown with RFX1/RFX3 antibodies","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EMSA with supershift plus in-cell genome pulldown; single lab","pmids":["29317724"],"is_preprint":false},{"year":2009,"finding":"RFX1 binds to the human PNRC promoter region (demonstrated by EMSA/gel shift and ChIP); RFX1 represses PNRC promoter activity in a dose-dependent manner in co-transfection experiments.","method":"Gel shift assay, ChIP, co-transfection reporter assay","journal":"Molekuliarnaia biologiia","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, EMSA and reporter assay only","pmids":["19334528"],"is_preprint":false},{"year":2021,"finding":"RFX1 mediates transcriptional activation of CCN3 under impaired glycolytic conditions in chondrocytic cells; inhibition of glycolysis induces RFX1 expression, and RFX1 silencing abolishes CCN3 induction; CCN3 produced via this pathway supports chondrocyte survival under energy starvation.","method":"Reporter gene assay, RFX1 knockdown (siRNA), glycolysis inhibitor treatments, in vivo cartilage imaging","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus siRNA knockdown with defined phenotypic readout; single lab","pmids":["33655492"],"is_preprint":false},{"year":2014,"finding":"RFX-1 (transcription factor) acts upstream of SHP-1 and is a critical regulator of SC-2001-mediated autophagy in hepatocellular carcinoma cells; RFX-1 siRNA knockdown protects cells from SC-2001-induced autophagy; SC-2001 upregulates RFX-1, which activates SHP-1, leading to STAT3/Mcl-1 dephosphorylation and beclin-1 release.","method":"siRNA knockdown, LC3-II Western blot, electron microscopy, in vivo xenograft","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA plus multiple downstream markers; single lab","pmids":["24952874"],"is_preprint":false},{"year":2011,"finding":"RFX-1 and AP-4 transcription factors bind to the SHP1 epithelial-specific promoter in serum/IGF-1-stimulated MCF-7 breast cancer cells; JNK-activated binding of AP-4 and RFX-1 induces SHP1 expression, which negatively regulates cell proliferation.","method":"Chromatin immunoprecipitation, promoter reporter assays, JNK inhibitor, siRNA","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional reporter plus inhibitor studies; single lab","pmids":["21719561"],"is_preprint":false},{"year":1993,"finding":"RFX-1 antisense oligonucleotides drastically inhibit IFN-γ-induced expression of HLA-DR, -DQ, and -DP in monocytic cells but have no effect on constitutive MHC class II expression in monocytes or B lymphocytes, demonstrating uncoupling of constitutive and inducible modes of MHC class II regulation and a selective role for RFX1 in inducible expression.","method":"Antisense oligonucleotides in cell culture, flow cytometry for HLA class II surface expression","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct antisense knockdown with defined phenotypic readout; single lab","pmids":["8223867"],"is_preprint":false}],"current_model":"RFX1 is a ubiquitously expressed, dual-function transcription factor that binds palindromic inverted-repeat DNA elements (X-boxes/EP elements) as homodimers or heterodimers (with RFX2, RFX3, or MIBP1) via a conserved DNA-binding domain, and can both activate and repress target genes (including HBV enhancer I, c-myc, PCNA, FGF1, CD11a, CD70, IL-17A, TLR4, CD36, Itga6, PNRC, and CCN3) depending on context; its repressive activity involves recruiting epigenetic co-repressors DNMT1, HDAC1, and SUV39H1 to target promoters; it harbors an N-terminal activation domain and a C-terminal repression/dimerization domain whose activities mutually neutralize each other in the intact protein; nuclear localization is controlled by a C-terminal nonclassical NLS whose activity is inhibited by an adjacent acidic autoinhibitory region, and nuclear import can be regulated by PKC-mediated phosphorylation; the protein is targeted for proteasomal degradation by the E3 ligase STUB1 and stabilized by KAT7-mediated acetylation; it also interacts with protein phosphatase PP1c and alpha-Adducin; in vivo, RFX1 is required in Sertoli cells for testis cord basal lamina integrity via Itga6 regulation and in immune cells for proper epigenetic silencing of autoimmune-related genes."},"narrative":{"mechanistic_narrative":"RFX1 is a ubiquitously expressed, dual-function transcription factor that recognizes palindromic inverted-repeat DNA elements (X-boxes/EP elements) through a conserved DNA-binding domain, binding as homodimers or as heterodimers with the related RFX2/RFX3 and the partner MIBP1 [PMID:2550788, PMID:8289803, PMID:7760800, PMID:29317724]. It was first defined as the hepatitis B virus enhancer I factor EF-C, where its intact interaction with a full inverted repeat is required for enhancer transactivation and where altered spacer length or half-site occupancy abolishes function [PMID:2550788, PMID:8413236, PMID:7713944, PMID:29601674]. Its activity is governed by an intramolecular architecture in which an N-terminal glutamine-rich activation domain and a C-terminal repression/dimerization domain mutually neutralize, rendering the intact protein nearly inactive until self-neutralization is relieved [PMID:9278482]; this dual potential explains why RFX1 both activates targets such as Itga6 and CCN3 [PMID:27228460, PMID:33655492] and represses many others, including c-myc, PCNA, FGF1, and PNRC [PMID:10336433, PMID:10918054, PMID:20189986]. RFX1-mediated repression operates largely through epigenetic silencing: at the CD11a, CD70, IL17A, and TLR4 promoters it recruits the co-repressors DNMT1, HDAC1, and the H3K9 methyltransferase SUV39H1 to impose DNA methylation, histone deacetylation, and H3K9 trimethylation, and loss of RFX1 derepresses these genes and drives monocyte and Th17 activation relevant to autoimmunity [PMID:20223637, PMID:21192791, PMID:29422534, PMID:30857550]. RFX1 abundance and nuclear access are tightly controlled — nuclear import depends on a C-terminal nonclassical NLS counteracted by an adjacent autoinhibitory acidic region and is induced by PKC activation [PMID:10918054, PMID:11358531], while protein stability is set by competing post-translational marks, with STUB1-mediated polyubiquitination driving proteasomal degradation and KAT7-mediated acetylation blocking it [PMID:27283392, PMID:40192836]. In vivo conditional knockout studies establish physiological roles in fetal Sertoli cells for testis cord basal lamina integrity via Itga6 activation and in myeloid cells for restraining CD36-driven foam cell formation and atherosclerosis [PMID:27228460, PMID:38402833].","teleology":[{"year":1989,"claim":"Established the DNA recognition logic of RFX1 (EF-C): how it reads its binding site and why dimerization is required.","evidence":"In vitro binding, DEPC interference, and spacer-mutagenesis on HBV/polyomavirus enhancers","pmids":["2550788"],"confidence":"High","gaps":["Did not identify the protein's gene identity","No cellular function established at this stage"]},{"year":1991,"claim":"Showed RFX1 binding can be CpG-methylation-dependent, linking it to methylation-sensitive gene readout.","evidence":"In vitro binding with methylated vs unmethylated substrates, identification as MDBP","pmids":["1850932"],"confidence":"Medium","gaps":["Functional consequence of methylation-dependent binding not tested in cells","Structural basis of m5C recognition unknown"]},{"year":1993,"claim":"Defined RFX1 as EF-C, a functional HBV enhancer I transactivator, and placed it within a novel homo/heterodimeric RFX family.","evidence":"Antisense knockdown, transactivation reporter assays, cloning, and in vitro/in vivo heterodimerization with RFX2/RFX3","pmids":["8413236","8289803"],"confidence":"High","gaps":["Liver-specific cofactors required for transactivation not all identified","Domain map of activation vs repression not yet resolved"]},{"year":1995,"claim":"Identified MIBP1 as an in vivo heterodimerization partner and showed RFX1-containing complexes can act as silencers at shared elements.","evidence":"Reciprocal Co-IP, EMSA supershift, and silencer reporter assays at c-myc, MHC II X-box, and HBV EP elements","pmids":["7760800","8709229"],"confidence":"Medium","gaps":["Mechanism of silencing not yet linked to chromatin modifiers","Whether MIBP1 is obligate for repression unknown"]},{"year":1997,"claim":"Resolved why intact RFX1 is nearly inactive — opposing activation and repression domains mutually neutralize, framing RFX1 as a context-switchable dual regulator.","evidence":"Deletion and chimeric construct transcription assays in transfected cells","pmids":["9278482"],"confidence":"High","gaps":["Physiological trigger that relieves self-neutralization not defined","Structural basis of intramolecular neutralization unknown"]},{"year":1998,"claim":"Linked an alternative low-mobility homodimeric complex formed on palindromic DNA to transcriptional repression, providing a conformational basis for the repressive mode.","evidence":"EMSA with dimerization-domain deletion mutants correlated with repression assays","pmids":["9733744","10556033"],"confidence":"Medium","gaps":["Molecular distinction between the two complexes not structurally defined","In vivo relevance of the low-mobility complex untested"]},{"year":1999,"claim":"Demonstrated RFX1 occupancy inversely controls target promoter strength, formalizing its inhibitory role at PCNA.","evidence":"EMSA site-directed mutants and reporter assays on the human PCNA PERE","pmids":["10336433"],"confidence":"Medium","gaps":["No co-repressor recruitment shown at this locus","Endogenous regulation of PCNA by RFX1 not tested"]},{"year":2001,"claim":"Defined how RFX1 nuclear access is controlled — a C-terminal nonclassical NLS opposed by an autoinhibitory acidic region, with PKC induction triggering nuclear translocation and target repression.","evidence":"Confocal microscopy of deletion constructs, fractionation, and PKC-activation studies with c-myc reporters","pmids":["11358531","10918054"],"confidence":"High","gaps":["Direct PKC phosphorylation sites not mapped","Signal upstream of PKC controlling RFX1 import unknown"]},{"year":2010,"claim":"Established the central repressive mechanism: RFX1 recruits DNMT1, HDAC1, and SUV39H1 to impose silencing chromatin marks, and its loss drives autoimmune gene overexpression.","evidence":"ChIP, Co-IP, and gain/loss-of-function in CD4+ T cells at CD11a/CD70 promoters","pmids":["20223637","21192791"],"confidence":"High","gaps":["Order of co-repressor recruitment not defined","What lowers RFX1 in SLE T cells not yet identified here"]},{"year":2016,"claim":"Identified STUB1 as the E3 ligase degrading RFX1, connecting RFX1 protein turnover to derepression of autoimmune targets.","evidence":"Co-IP, ubiquitination assay, and STUB1 overexpression in SLE CD4+ T cells","pmids":["27283392"],"confidence":"Medium","gaps":["Ubiquitin acceptor lysines not mapped","Regulation of STUB1 itself not addressed"]},{"year":2016,"claim":"Provided in vivo evidence for an activating role — RFX1 in fetal Sertoli cells directly activates Itga6 to maintain testis cord integrity.","evidence":"Conditional Amh-Cre Rfx1 knockout, histology, ChIP, and luciferase reporter on Itga6","pmids":["27228460"],"confidence":"High","gaps":["How RFX1 switches to an activator at Itga6 unclear","Cofactors for activation in Sertoli cells unknown"]},{"year":2018,"claim":"Placed RFX1 downstream of IL-6/STAT3 in restraining Th17 differentiation through epigenetic repression of IL17A, with genetic confirmation in vivo.","evidence":"Conditional Rfx1 knockout mice, ChIP, reporter assays, and Th17 differentiation","pmids":["29422534"],"confidence":"High","gaps":["Mechanism by which pSTAT3 lowers RFX1 not fully defined","Direct STAT3-RFX1 promoter interaction not detailed"]},{"year":2019,"claim":"Extended the DNMT1/HDAC1/SUV39H1 repression mechanism to TLR4 in monocytes, generalizing RFX1 as an innate-immune epigenetic brake.","evidence":"ChIP and gain/loss-of-function with reporter assays in CD14+ monocytes","pmids":["30857550"],"confidence":"Medium","gaps":["Whether the same co-repressor stoichiometry applies untested","PP1c interaction with RFX1's repression domain functionally unintegrated [#26]"]},{"year":2024,"claim":"Demonstrated a 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diethyl pyrocarbonate interference and competition assays showed it contacts symmetrical nucleotides within the inverted repeat; spacer-length mutagenesis showed that altering spacing by ≥3 bp abolishes binding, suggesting binding is stabilized by dimerization.\",\n      \"method\": \"In vitro binding assays, diethyl pyrocarbonate interference, competition binding with mutant sites, in vivo enhancer function assays with spacer mutants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal in vitro biochemical assays with mutagenesis plus in vivo functional validation in a single rigorous study\",\n      \"pmids\": [\"2550788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"EF-C (RFX1) exhibits methylation-dependent DNA binding: it binds certain DNA sites only when CpG dinucleotides are methylated (m5C), while other sites are bound in a methylation-independent manner; EF-C was concluded to correspond to the methylation-dependent DNA-binding protein MDBP.\",\n      \"method\": \"In vitro binding assays with methylated and unmethylated DNA substrates\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical characterization with defined substrates, single lab but multiple binding site comparisons\",\n      \"pmids\": [\"1850932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"RFX1 is identical to the enhancer factor EF-C; RFX1-specific antisense oligonucleotides inhibit hepatitis B virus enhancer I (EnhI)-driven expression of HBV major surface antigen in HepG2 cells, and RFX1 acts as a transactivator of EnhI in transfection assays; transactivation is not observed in non-liver cell lines, indicating cooperation with liver-specific factors.\",\n      \"method\": \"Antisense oligonucleotide knockdown, transfection-based reporter assays, EMSA\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — identity confirmed and functional role validated by antisense knockdown plus transactivation assay in multiple cell lines; replicated/consistent with PMID:8289803\",\n      \"pmids\": [\"8413236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"RFX1 belongs to a novel family of homodimeric and heterodimeric DNA-binding proteins (RFX1, RFX2, RFX3); RFX proteins heterodimerize both in vitro and in vivo; they share five conserved regions including two domains required for DNA binding and dimerization; they have a peculiar dependence on methylated CpG dinucleotides at certain binding sites.\",\n      \"method\": \"Cloning, EMSA, in vitro and in vivo heterodimerization assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical characterization of dimerization in vitro and in vivo with domain mapping; foundational study replicated across subsequent work\",\n      \"pmids\": [\"8289803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"RFX1 (EF-C) is required for efficient HBV enhancer I function but the EF-C site does not possess intrinsic enhancer activity alone; it functions synergistically with the adjacent GB element; HNF-4 transactivates via the GB element in an EF-C-site-dependent manner; RXRα transactivates via GB in response to retinoic acid largely EF-C-independently; COUP-TF antagonizes GB element activity in liver cells.\",\n      \"method\": \"In vitro binding assays (EMSA), transfection-based reporter assays, mutational analysis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional dissection experiments with cooperating factors, single lab\",\n      \"pmids\": [\"8389913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"RFX1 binds to the alpha element of the mouse rpL30 promoter; a mutation abolishing RFX1 binding reduces rpL30 promoter activity to ~43% of wild-type, indicating RFX1 plays an important role in rpL30 promoter strength.\",\n      \"method\": \"EMSA competition assay, antibody supershift, promoter activity assay with mutant alpha element\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA plus mutagenesis plus reporter assay; single lab\",\n      \"pmids\": [\"8224874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"MIBP1 and RFX1 associate in vivo to form a complex; both are present in DNA-protein complexes at the c-myc MIF-1 element, the MHC class II X-box, and the HBV EP element; tandem repeats of the MIBP1/RFX1-binding site can function as silencers in HepG2 and HeLa cells.\",\n      \"method\": \"Co-immunoprecipitation, EMSA with antibody supershift, reporter silencer assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and EMSA supershift in vivo; single lab\",\n      \"pmids\": [\"7760800\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Intact interaction of EF-C/RFX1 with a full inverted repeat is required for transactivation of the HBV and polyomavirus enhancers; binding to the MHC class II DRA promoter represents unstable half-site interaction, suggesting an additional activity is required to stabilize RFX1 at MHC class II promoters.\",\n      \"method\": \"EMSA with purified protein and mutant binding sites, chemical footprinting, modification interference assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — purified protein, multiple in vitro biochemical assays with mutagenesis and footprinting; single lab\",\n      \"pmids\": [\"7713944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"RFX1 (EF-C) associates with the PCNA E1A-responsive element (PERE) as the major component of the P1 complex; ATF-1 is a major component of the P2/P3 complexes; their binding was demonstrated by antibody interference EMSA and in vitro-synthesized protein assays.\",\n      \"method\": \"EMSA, antibody interference/supershift, in vitro protein synthesis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — antibody supershift plus in vitro protein; single lab\",\n      \"pmids\": [\"7479004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"MIBP1 and RFX1 both bind to the EP element of HBV enhancer I; the EP element alone can repress transcription of an SV40 promoter in a position- and orientation-independent manner (silencer function) in hepatocarcinoma cells.\",\n      \"method\": \"EMSA with antibody supershift, reporter repression assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA and reporter assay; single lab\",\n      \"pmids\": [\"8709229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"RFX1 contains an N-terminal activation domain with a glutamine-rich region and a C-terminal repressor domain overlapping the dimerization domain; these activities mutually neutralize each other in the intact protein, producing a nearly inactive transcription factor; relief of self-neutralization can allow RFX1 to act as a dual-function regulator.\",\n      \"method\": \"Deletion mutant analysis, chimeric protein assays, transcriptional activity assays in transfected cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic deletion and chimeric mutant functional dissection with multiple constructs; single lab but comprehensive\",\n      \"pmids\": [\"9278482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"RFX1 can bind to the NRE gamma subregion of the HBV core promoter and transactivate through this site; RFX1 can bind simultaneously with MIBP1 to NRE gamma, most likely as a heterodimer; mutations abolishing NRE gamma silencing also prevent RFX1 binding.\",\n      \"method\": \"EMSA, mutational analysis, transcriptional reporter assays\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA with mutagenesis plus reporter assay; single lab\",\n      \"pmids\": [\"9018153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RFX1 possesses a split, extended dimerization domain composed of several conserved boxes; it generates two alternative homodimeric DNA-protein complexes (a canonical complex and a novel low-mobility complex formed only with palindromic DNA); formation of the low-mobility complex correlates with transcriptional repression; different deletions within the dimerization domain alter the relative abundance of the two complexes.\",\n      \"method\": \"EMSA with deletion mutants, transcriptional repression assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic deletion mutagenesis correlating complex formation with repression; single lab\",\n      \"pmids\": [\"9733744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Mutations within the RFX1 consensus binding site in the human PCNA PERE reduce RFX1 binding and increase PCNA transcriptional activity; mutations that increase RFX1 binding reduce PCNA promoter activity; RFX1 plays an inhibitory role in PCNA gene regulation.\",\n      \"method\": \"EMSA with site-directed mutants, transient transfection reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA mutagenesis correlated with reporter activity; single lab\",\n      \"pmids\": [\"10336433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The C-terminal dimerization domain of RFX1 is conserved with yeast RFX orthologues Sak1 (S. pombe) and Crt1 (S. cerevisiae); the ability to generate two alternative homodimeric complexes is conserved across species; dimerization and repression capacity differs: RFX1 > Sak1 > Crt1.\",\n      \"method\": \"Domain swap/chimeric protein constructs, EMSA, Gal4-fusion transcriptional assays\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — chimeric protein analysis with EMSA and transcriptional assays; single lab\",\n      \"pmids\": [\"10556033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Activation of protein kinase C (PKC) by PMA or bryostatin 1 induces nuclear translocation of RFX1 without altering total RFX1 levels; nuclear RFX1 binds to the c-myc intron 1 X box (MIE1); this binding is required for down-regulation of c-myc reporter expression; PKC inhibition abolishes both nuclear translocation and c-myc repression.\",\n      \"method\": \"Nuclear/cytosolic fractionation, EMSA with antibody supershift, reporter gene assays with X box mutations, specific PKC inhibitor\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation plus EMSA plus reporter mutagenesis with pharmacological controls, multiple orthogonal methods; single lab\",\n      \"pmids\": [\"10918054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RFX1 contains a nonclassical nuclear localization signal (NLS) at its extreme C-terminus; the adjacent acidic region potentiates NLS function but also inhibits nuclear DNA-binding activity, suggesting an autoinhibitory mechanism; the DNA-binding domain mediates tight nuclear association; the dimerization domain enhances nuclear association; phosphorylation by kinases such as PKC may coordinately regulate nuclear import and DNA binding.\",\n      \"method\": \"Confocal fluorescence microscopy of deletion constructs, subcellular fractionation, domain mapping\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by confocal microscopy with multiple domain deletion constructs and fractionation; single lab\",\n      \"pmids\": [\"11358531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RFX1 binds to P sequence element A (PSE-A) within the human GH locus 263P repressor element; disruption of the RFX1 site blunts repressor activity; RFX1 and NF-1 family members co-immunoprecipitate and both associate with P sequences in human pituitary tissue chromatin; association of these factors inversely correlates with CS promoter histone hyperacetylation.\",\n      \"method\": \"EMSA, reporter assays with mutant PSE-A, co-immunoprecipitation, chromatin immunoprecipitation from human pituitary tissue\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP in native tissue plus Co-IP plus reporter assay; single lab\",\n      \"pmids\": [\"12624117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RFX1 recruits co-repressors DNMT1 and HDAC1 to the CD11a and CD70 promoters in CD4+ T cells, causing DNA methylation and histone deacetylation and repressing their expression; reduced RFX1 in SLE CD4+ T cells causes loss of these epigenetic marks and CD11a/CD70 overexpression.\",\n      \"method\": \"ChIP assay, RFX1 overexpression and knockdown in CD4+ T cells, flow cytometry for surface marker expression\",\n      \"journal\": \"Journal of autoimmunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating recruitment plus gain- and loss-of-function with functional readout; replicated in subsequent work (PMID:21192791)\",\n      \"pmids\": [\"20223637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RFX1 binds 18-bp cis-elements of the FGF1 gene 1B promoter and negatively regulates FGF1-B mRNA expression and neurosphere formation in glioblastoma cells; RFX1 overexpression suppresses neurosphere formation while RFX1 knockdown increases it.\",\n      \"method\": \"Yeast one-hybrid assay, EMSA, ChIP, gain- and loss-of-function assays, neurosphere assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (yeast one-hybrid, EMSA, ChIP, functional assays) in single study\",\n      \"pmids\": [\"20189986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RFX1 recruits the histone methyltransferase SUV39H1 to the CD11a and CD70 promoters in CD4+ T cells, regulating H3K9 tri-methylation; co-immunoprecipitation confirmed RFX1-SUV39H1 interaction; RFX1 levels correlate with H3K9me3 at these promoters.\",\n      \"method\": \"Co-immunoprecipitation, Western blot, immunofluorescence, ChIP with real-time PCR, RFX1 overexpression/knockdown\",\n      \"journal\": \"Arthritis research & therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus ChIP plus gain/loss-of-function; corroborates PMID:20223637 with an additional co-repressor\",\n      \"pmids\": [\"21192791\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RFX-1 specifically interacts with alpha Adducin in a yeast two-hybrid screen; interaction was confirmed in cells by co-immunoprecipitation and colocalization; alpha Adducin and RFX-1 co-localize in the nucleus, suggesting Adducin may modulate RFX-1 transcriptional activity.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, colocalization microscopy\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single Co-IP with no functional follow-up on RFX1 activity\",\n      \"pmids\": [\"16289097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RFX1 protein is degraded by polyubiquitination-mediated proteasomal degradation; the E3 ubiquitin ligase STUB1 mediates this degradation; STUB1 is upregulated in SLE CD4+ T cells; STUB1 overexpression leads to elevated CD70 and CD11a levels consistent with reduced RFX1.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, STUB1 overexpression\",\n      \"journal\": \"Clinical immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional ubiquitination assay identifying the E3 ligase; single lab\",\n      \"pmids\": [\"27283392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RFX1 represses IL-17A expression by recruiting repressive epigenetic marks (decreased H3 acetylation, increased DNA methylation, and increased H3K9 tri-methylation) at the IL17A promoter in CD4+ T cells; phosphorylated STAT3 inhibits RFX1 expression, placing RFX1 downstream of IL-6/STAT3 signaling in a non-canonical pathway regulating Th17 differentiation; conditional Rfx1 deletion in mice increases Th17 cell induction.\",\n      \"method\": \"ChIP, reporter assays, conditional Rfx1 knockout mice, in vitro Th17 differentiation assays, forced RFX1 re-expression\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic (conditional KO) plus ChIP plus in vitro reconstitution plus overexpression rescue; multiple orthogonal methods\",\n      \"pmids\": [\"29422534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RFX1 directly binds the HBV enhancer I EP element; doxorubicin increases RFX1 expression and its binding to HBV enhancer I; knocking down endogenous RFX1 or mutating the EP element significantly attenuates doxorubicin-promoted HBV replication.\",\n      \"method\": \"ChIP, siRNA knockdown, EP element mutagenesis, HBV replication assay\",\n      \"journal\": \"Cancer medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus KD plus mutagenesis; single lab\",\n      \"pmids\": [\"29601674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RFX1 directly represses TLR4 transcription in CD14+ monocytes by recruiting DNMT1, HDAC1, and SUV39H1 to the TLR4 promoter, maintaining DNA methylation and H3K9 tri-methylation and limiting H3/H4 acetylation; RFX1 knockdown causes TLR4 overexpression and monocyte activation.\",\n      \"method\": \"ChIP, RFX1 knockdown and overexpression, reporter assay, Western blot\",\n      \"journal\": \"Clinical epigenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus gain/loss-of-function; single lab, recapitulates mechanism established in T cells\",\n      \"pmids\": [\"30857550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The C-terminal repression domain of RFX1 directly interacts with the catalytic subunit of protein phosphatase 1 (PP1c); RFX1 can recruit PP1c to specific genomic sites/promoters.\",\n      \"method\": \"Co-immunoprecipitation, chromatin recruitment assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP plus recruitment assay; single lab, minimal mechanistic follow-up\",\n      \"pmids\": [\"30654936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RFX1 is specifically expressed in fetal Sertoli cells and is required for testis cord integrity; conditional Rfx1 knockout mice (Rfx1flox/flox, Amh-Cre) show fragmented basal lamina and blocked spermatogenesis; RFX1 directly activates transcription of Itga6 (integrin alpha-6) as shown by luciferase reporter and ChIP assays.\",\n      \"method\": \"Conditional knockout mouse model, histology, luciferase reporter assay, ChIP\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function in vivo plus direct target validation by ChIP and reporter assay; single lab\",\n      \"pmids\": [\"27228460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KAT7 acetyltransferase mediates acetylation of RFX1; NgBR deficiency suppresses KAT7 expression, impairing KAT7-mediated RFX1 acetylation, which stabilizes RFX1 by blocking its proteasomal degradation, thereby increasing RFX1-mediated repression of FGF1 transcription.\",\n      \"method\": \"RNA sequencing, Western blot, KAT7 knockdown/overexpression, proteasome inhibitor assays, neuronal damage models\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — identification of acetylation writer (KAT7) with functional consequence on RFX1 stability and target gene; single lab\",\n      \"pmids\": [\"40192836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The splicing factor RBM39 binds to RFX1 pre-mRNA (demonstrated by RIP-seq) and promotes skipping of exon 2 in HCC cells, producing an N-terminal truncated RFX1 isoform that loses transcriptional repression activity on collagen genes, thereby activating the FAK/PI3K/AKT integrin signaling pathway.\",\n      \"method\": \"RNA immunoprecipitation sequencing (RIP-seq), RBM39 silencing, alternative splicing analysis, functional signaling pathway assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq identifies direct pre-mRNA binding plus functional isoform characterization; single lab\",\n      \"pmids\": [\"40033026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RFX1 directly represses CD36 transcription in macrophages (demonstrated by dual luciferase reporter assay); Rfx1 deficiency in myeloid cells (ApoE−/−Rfx1f/f Lyz2-Cre mice) aggravates atherosclerotic lesions; RFX1 loss increases foam cell formation via elevated CD36-mediated lipid uptake.\",\n      \"method\": \"Dual luciferase reporter assay, conditional myeloid Rfx1 knockout mice, RFX1 overexpression/silencing in macrophages, lipid uptake assays\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model plus direct transcriptional target validation by reporter assay; multiple orthogonal methods\",\n      \"pmids\": [\"38402833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RFX1 and RFX3 form homodimers and heterodimers that bind specifically to the double-stranded D sequence of AAV inverted terminal repeats (ITRs); these complexes can be pulled down bound to AAV genomes in transduced HEK-293 cells, and RFX proteins act as regulators of AAV-mediated transgene expression.\",\n      \"method\": \"EMSA, supershift with antibodies, AAV genome pulldown with RFX1/RFX3 antibodies\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EMSA with supershift plus in-cell genome pulldown; single lab\",\n      \"pmids\": [\"29317724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RFX1 binds to the human PNRC promoter region (demonstrated by EMSA/gel shift and ChIP); RFX1 represses PNRC promoter activity in a dose-dependent manner in co-transfection experiments.\",\n      \"method\": \"Gel shift assay, ChIP, co-transfection reporter assay\",\n      \"journal\": \"Molekuliarnaia biologiia\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, EMSA and reporter assay only\",\n      \"pmids\": [\"19334528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RFX1 mediates transcriptional activation of CCN3 under impaired glycolytic conditions in chondrocytic cells; inhibition of glycolysis induces RFX1 expression, and RFX1 silencing abolishes CCN3 induction; CCN3 produced via this pathway supports chondrocyte survival under energy starvation.\",\n      \"method\": \"Reporter gene assay, RFX1 knockdown (siRNA), glycolysis inhibitor treatments, in vivo cartilage imaging\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus siRNA knockdown with defined phenotypic readout; single lab\",\n      \"pmids\": [\"33655492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RFX-1 (transcription factor) acts upstream of SHP-1 and is a critical regulator of SC-2001-mediated autophagy in hepatocellular carcinoma cells; RFX-1 siRNA knockdown protects cells from SC-2001-induced autophagy; SC-2001 upregulates RFX-1, which activates SHP-1, leading to STAT3/Mcl-1 dephosphorylation and beclin-1 release.\",\n      \"method\": \"siRNA knockdown, LC3-II Western blot, electron microscopy, in vivo xenograft\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA plus multiple downstream markers; single lab\",\n      \"pmids\": [\"24952874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RFX-1 and AP-4 transcription factors bind to the SHP1 epithelial-specific promoter in serum/IGF-1-stimulated MCF-7 breast cancer cells; JNK-activated binding of AP-4 and RFX-1 induces SHP1 expression, which negatively regulates cell proliferation.\",\n      \"method\": \"Chromatin immunoprecipitation, promoter reporter assays, JNK inhibitor, siRNA\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional reporter plus inhibitor studies; single lab\",\n      \"pmids\": [\"21719561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"RFX-1 antisense oligonucleotides drastically inhibit IFN-γ-induced expression of HLA-DR, -DQ, and -DP in monocytic cells but have no effect on constitutive MHC class II expression in monocytes or B lymphocytes, demonstrating uncoupling of constitutive and inducible modes of MHC class II regulation and a selective role for RFX1 in inducible expression.\",\n      \"method\": \"Antisense oligonucleotides in cell culture, flow cytometry for HLA class II surface expression\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct antisense knockdown with defined phenotypic readout; single lab\",\n      \"pmids\": [\"8223867\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RFX1 is a ubiquitously expressed, dual-function transcription factor that binds palindromic inverted-repeat DNA elements (X-boxes/EP elements) as homodimers or heterodimers (with RFX2, RFX3, or MIBP1) via a conserved DNA-binding domain, and can both activate and repress target genes (including HBV enhancer I, c-myc, PCNA, FGF1, CD11a, CD70, IL-17A, TLR4, CD36, Itga6, PNRC, and CCN3) depending on context; its repressive activity involves recruiting epigenetic co-repressors DNMT1, HDAC1, and SUV39H1 to target promoters; it harbors an N-terminal activation domain and a C-terminal repression/dimerization domain whose activities mutually neutralize each other in the intact protein; nuclear localization is controlled by a C-terminal nonclassical NLS whose activity is inhibited by an adjacent acidic autoinhibitory region, and nuclear import can be regulated by PKC-mediated phosphorylation; the protein is targeted for proteasomal degradation by the E3 ligase STUB1 and stabilized by KAT7-mediated acetylation; it also interacts with protein phosphatase PP1c and alpha-Adducin; in vivo, RFX1 is required in Sertoli cells for testis cord basal lamina integrity via Itga6 regulation and in immune cells for proper epigenetic silencing of autoimmune-related genes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RFX1 is a ubiquitously expressed, dual-function transcription factor that recognizes palindromic inverted-repeat DNA elements (X-boxes/EP elements) through a conserved DNA-binding domain, binding as homodimers or as heterodimers with the related RFX2/RFX3 and the partner MIBP1 [#0, #3, #6, #31]. It was first defined as the hepatitis B virus enhancer I factor EF-C, where its intact interaction with a full inverted repeat is required for enhancer transactivation and where altered spacer length or half-site occupancy abolishes function [#0, #2, #7, #24]. Its activity is governed by an intramolecular architecture in which an N-terminal glutamine-rich activation domain and a C-terminal repression/dimerization domain mutually neutralize, rendering the intact protein nearly inactive until self-neutralization is relieved [#10]; this dual potential explains why RFX1 both activates targets such as Itga6 and CCN3 [#27, #33] and represses many others, including c-myc, PCNA, FGF1, and PNRC [#13, #15, #19]. RFX1-mediated repression operates largely through epigenetic silencing: at the CD11a, CD70, IL17A, and TLR4 promoters it recruits the co-repressors DNMT1, HDAC1, and the H3K9 methyltransferase SUV39H1 to impose DNA methylation, histone deacetylation, and H3K9 trimethylation, and loss of RFX1 derepresses these genes and drives monocyte and Th17 activation relevant to autoimmunity [#18, #20, #23, #25]. RFX1 abundance and nuclear access are tightly controlled — nuclear import depends on a C-terminal nonclassical NLS counteracted by an adjacent autoinhibitory acidic region and is induced by PKC activation [#15, #16], while protein stability is set by competing post-translational marks, with STUB1-mediated polyubiquitination driving proteasomal degradation and KAT7-mediated acetylation blocking it [#22, #28]. In vivo conditional knockout studies establish physiological roles in fetal Sertoli cells for testis cord basal lamina integrity via Itga6 activation and in myeloid cells for restraining CD36-driven foam cell formation and atherosclerosis [#27, #30].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Established the DNA recognition logic of RFX1 (EF-C): how it reads its binding site and why dimerization is required.\",\n      \"evidence\": \"In vitro binding, DEPC interference, and spacer-mutagenesis on HBV/polyomavirus enhancers\",\n      \"pmids\": [\"2550788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the protein's gene identity\", \"No cellular function established at this stage\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Showed RFX1 binding can be CpG-methylation-dependent, linking it to methylation-sensitive gene readout.\",\n      \"evidence\": \"In vitro binding with methylated vs unmethylated substrates, identification as MDBP\",\n      \"pmids\": [\"1850932\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of methylation-dependent binding not tested in cells\", \"Structural basis of m5C recognition unknown\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Defined RFX1 as EF-C, a functional HBV enhancer I transactivator, and placed it within a novel homo/heterodimeric RFX family.\",\n      \"evidence\": \"Antisense knockdown, transactivation reporter assays, cloning, and in vitro/in vivo heterodimerization with RFX2/RFX3\",\n      \"pmids\": [\"8413236\", \"8289803\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Liver-specific cofactors required for transactivation not all identified\", \"Domain map of activation vs repression not yet resolved\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identified MIBP1 as an in vivo heterodimerization partner and showed RFX1-containing complexes can act as silencers at shared elements.\",\n      \"evidence\": \"Reciprocal Co-IP, EMSA supershift, and silencer reporter assays at c-myc, MHC II X-box, and HBV EP elements\",\n      \"pmids\": [\"7760800\", \"8709229\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of silencing not yet linked to chromatin modifiers\", \"Whether MIBP1 is obligate for repression unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Resolved why intact RFX1 is nearly inactive — opposing activation and repression domains mutually neutralize, framing RFX1 as a context-switchable dual regulator.\",\n      \"evidence\": \"Deletion and chimeric construct transcription assays in transfected cells\",\n      \"pmids\": [\"9278482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger that relieves self-neutralization not defined\", \"Structural basis of intramolecular neutralization unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Linked an alternative low-mobility homodimeric complex formed on palindromic DNA to transcriptional repression, providing a conformational basis for the repressive mode.\",\n      \"evidence\": \"EMSA with dimerization-domain deletion mutants correlated with repression assays\",\n      \"pmids\": [\"9733744\", \"10556033\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular distinction between the two complexes not structurally defined\", \"In vivo relevance of the low-mobility complex untested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrated RFX1 occupancy inversely controls target promoter strength, formalizing its inhibitory role at PCNA.\",\n      \"evidence\": \"EMSA site-directed mutants and reporter assays on the human PCNA PERE\",\n      \"pmids\": [\"10336433\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No co-repressor recruitment shown at this locus\", \"Endogenous regulation of PCNA by RFX1 not tested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined how RFX1 nuclear access is controlled — a C-terminal nonclassical NLS opposed by an autoinhibitory acidic region, with PKC induction triggering nuclear translocation and target repression.\",\n      \"evidence\": \"Confocal microscopy of deletion constructs, fractionation, and PKC-activation studies with c-myc reporters\",\n      \"pmids\": [\"11358531\", \"10918054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PKC phosphorylation sites not mapped\", \"Signal upstream of PKC controlling RFX1 import unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established the central repressive mechanism: RFX1 recruits DNMT1, HDAC1, and SUV39H1 to impose silencing chromatin marks, and its loss drives autoimmune gene overexpression.\",\n      \"evidence\": \"ChIP, Co-IP, and gain/loss-of-function in CD4+ T cells at CD11a/CD70 promoters\",\n      \"pmids\": [\"20223637\", \"21192791\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of co-repressor recruitment not defined\", \"What lowers RFX1 in SLE T cells not yet identified here\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified STUB1 as the E3 ligase degrading RFX1, connecting RFX1 protein turnover to derepression of autoimmune targets.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, and STUB1 overexpression in SLE CD4+ T cells\",\n      \"pmids\": [\"27283392\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ubiquitin acceptor lysines not mapped\", \"Regulation of STUB1 itself not addressed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided in vivo evidence for an activating role — RFX1 in fetal Sertoli cells directly activates Itga6 to maintain testis cord integrity.\",\n      \"evidence\": \"Conditional Amh-Cre Rfx1 knockout, histology, ChIP, and luciferase reporter on Itga6\",\n      \"pmids\": [\"27228460\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RFX1 switches to an activator at Itga6 unclear\", \"Cofactors for activation in Sertoli cells unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed RFX1 downstream of IL-6/STAT3 in restraining Th17 differentiation through epigenetic repression of IL17A, with genetic confirmation in vivo.\",\n      \"evidence\": \"Conditional Rfx1 knockout mice, ChIP, reporter assays, and Th17 differentiation\",\n      \"pmids\": [\"29422534\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which pSTAT3 lowers RFX1 not fully defined\", \"Direct STAT3-RFX1 promoter interaction not detailed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended the DNMT1/HDAC1/SUV39H1 repression mechanism to TLR4 in monocytes, generalizing RFX1 as an innate-immune epigenetic brake.\",\n      \"evidence\": \"ChIP and gain/loss-of-function with reporter assays in CD14+ monocytes\",\n      \"pmids\": [\"30857550\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the same co-repressor stoichiometry applies untested\", \"PP1c interaction with RFX1's repression domain functionally unintegrated [#26]\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated a metabolic/atherosclerosis role — myeloid RFX1 directly represses CD36 to limit lipid uptake and foam cell formation.\",\n      \"evidence\": \"Conditional Lyz2-Cre Rfx1 knockout on ApoE-/- background, reporter assays, and lipid uptake assays\",\n      \"pmids\": [\"38402833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CD36 repression uses the same co-repressors not shown\", \"Upstream signals setting RFX1 levels in plaque macrophages unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined competing post-translational control of RFX1 stability — KAT7-mediated acetylation blocks proteasomal degradation, opposing STUB1, and RBM39-driven exon-2 skipping generates a repression-dead truncated isoform.\",\n      \"evidence\": \"KAT7 knockdown/overexpression with proteasome inhibitors; RIP-seq and splicing analysis with RBM39 silencing\",\n      \"pmids\": [\"40192836\", \"40033026\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Acetylated lysines and their interplay with ubiquitination not mapped\", \"Tissue distribution of the truncated isoform unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RFX1 selects between activating and repressive modes at a given promoter, and the structural basis of its self-neutralization, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of full-length RFX1 or its DNA-bound complexes\", \"Rules governing co-repressor vs co-activator recruitment unknown\", \"Integration of phosphorylation, acetylation, and ubiquitination into a single regulatory logic not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 3, 7, 24]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 10, 18, 23, 27, 30]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [15, 16, 21]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 10, 13, 18, 27, 30]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [18, 20, 23, 25]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [23, 25, 30, 36]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RFX2\", \"RFX3\", \"MIBP1\", \"DNMT1\", \"HDAC1\", \"SUV39H1\", \"STUB1\", \"KAT7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}