{"gene":"DUX4","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2007,"finding":"DUX4 functions as a transcriptional activator of PITX1; it binds a specific 30-bp sequence in the Pitx1 promoter (containing a TAAT core motif) as demonstrated by EMSA, and mutations of the TAAT core abolished both DUX4 binding in vitro and Pitx1-luciferase reporter activation in C2C12 cells.","method":"Luciferase reporter assay, EMSA, site-directed mutagenesis, transfection in C2C12 cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding assay (EMSA) plus mutagenesis plus reporter assay, single lab, multiple orthogonal methods","pmids":["17984056"],"is_preprint":false},{"year":2007,"finding":"DUX4 localizes to the nucleus and its overexpression induces caspase 3/7-dependent apoptosis and alters emerin distribution at the nuclear envelope.","method":"CMV-DUX4 transfection, caspase 3/7 activity assay, immunofluorescence localization, nuclear fractionation","journal":"Neuromuscular disorders : NMD","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment, caspase activity assay with functional consequence (cell death), single lab, multiple readouts","pmids":["17588759"],"is_preprint":false},{"year":2008,"finding":"DUX4 expression represses MyoD and its target genes, diminishes myogenic differentiation, represses glutathione redox pathway components, and sensitizes cells to oxidative stress; DUX4 toxicity is antagonized by high-level expression of Pax3 or Pax7, suggesting competitive interaction via related homeodomains.","method":"Inducible cassette exchange isogenic myoblast expression screen, gene expression profiling, Pax3/Pax7 co-expression rescue experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — isogenic cell system with titratable expression, multiple molecular readouts, competition rescue experiments, replicated by subsequent studies","pmids":["18833193"],"is_preprint":false},{"year":2010,"finding":"DUX4 myopathic activity in vivo requires intact DNA binding (a DNA-binding domain mutant caused no muscle abnormalities), and DUX4-induced myopathy in mice is p53-dependent (p53-null muscles are resistant to DUX4-induced damage).","method":"Transposon-mediated transgenesis in zebrafish, AAV delivery in mouse muscle, DNA-binding domain mutant, p53-null mouse cross","journal":"Annals of neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function mutagenesis (DNA-binding mutant), genetic epistasis (p53-null), two animal models, multiple orthogonal methods","pmids":["21446026"],"is_preprint":false},{"year":2011,"finding":"DUX4 activates germline and early stem cell genes, binds and activates LTR elements from MaLR endogenous primate retrotransposons, and suppresses the innate immune response to viral infection at least partly through activation of DEFB103 (a human defensin that can inhibit muscle differentiation).","method":"ChIP-seq, gene expression profiling, reporter assays, DUX4 transfection in muscle cells","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq plus expression profiling plus reporter assays, replicated across multiple subsequent studies","pmids":["22209328"],"is_preprint":false},{"year":2011,"finding":"DUX4 expression in myoblasts induces atrophic myotube formation associated with induction of E3 ubiquitin ligases MuRF1 and Atrogin1/MAFbx; siRNA and antisense oligonucleotides targeting DUX4 mRNA suppressed DUX4 protein and reduced downstream target expression in FSHD myoblasts.","method":"DUX4 expression vector transfection, siRNA/antisense knockdown, qRT-PCR, immunofluorescence","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function (siRNA/ASO) with specific molecular phenotype (ubiquitin ligase induction, atrophy markers), single lab, multiple methods","pmids":["22053214"],"is_preprint":false},{"year":2012,"finding":"DUX4 protein is expressed in only ~1/1000 FSHD myoblasts but ~1/200 myotube nuclei; DUX4 and its target PITX1 show protein staining gradients across consecutive myonuclei suggesting diffusion between nuclei; both protein half-lives are regulated by the ubiquitin-proteasome pathway.","method":"Immunodetection, quantitative nuclear scoring, proteasome inhibitor treatment, protein stability assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein localization with nuclear gradient quantification, proteasome inhibitor experiments demonstrating ubiquitin-proteasome regulation, single lab","pmids":["23206257"],"is_preprint":false},{"year":2014,"finding":"DUX4 induces G1 cell cycle arrest by upregulating p21 expression in a p53-independent manner via increased Sp1 transcription factor binding to the p21 promoter; ChIP confirmed DUX4-induced Sp1 binding to the p21 promoter in vivo.","method":"Cell cycle analysis (flow cytometry), p21 promoter-luciferase reporter, Sp1 binding site mutation, ChIP assay, p21 siRNA rescue","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — ChIP, reporter assay with mutagenesis, siRNA rescue, single lab","pmids":["24589735"],"is_preprint":false},{"year":2014,"finding":"DUX4 expression is driven by two muscle-specific enhancers (DME1 and DME2) that physically interact with the DUX4 promoter in skeletal myocytes (confirmed by chromosome conformation capture) but not in fibroblasts, explaining muscle-tissue specificity of DUX4-fl expression.","method":"Chromatin immunoprecipitation (ChIP), chromosome conformation capture (3C), nucleosome occupancy and methylome sequencing, luciferase reporters","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — 3C chromatin looping, ChIP for histone marks and RNA Pol II, multiple orthogonal chromatin methods, single lab","pmids":["24636994"],"is_preprint":false},{"year":2015,"finding":"DUX4 protein triggers proteolytic degradation of UPF1, a central NMD component, causing profound NMD inhibition and global accumulation of NMD substrate RNAs; DUX4 mRNA is itself an NMD substrate, creating a double-negative feedback loop that stabilizes DUX4 mRNA.","method":"DUX4-inducible cell system, RNA-seq, UPF1 protein quantification, NMD reporter assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic epistasis (UPF1 degradation → NMD loss → DUX4 mRNA stabilization), RNA-seq, multiple orthogonal assays, replicated in subsequent work","pmids":["25564732"],"is_preprint":false},{"year":2015,"finding":"DUX4-FL expression inhibits protein turnover via the ubiquitin-proteasome system and induces TDP-43 aggregation in expressing nuclei; the non-toxic short isoform DUX4-S does not cause these changes. Proteasome inhibition with MG132 phenocopies TDP-43 aggregation.","method":"Exogenous BacMam DUX4-FL expression, immunofluorescence, insoluble protein fractionation, proteasome inhibitor treatment","journal":"Annals of clinical and translational neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein localization, fractionation, pharmacological phenocopy, isoform comparison, single lab","pmids":["25750920"],"is_preprint":false},{"year":2016,"finding":"DUX4 recruits the histone acetyltransferases p300/CBP through its C-terminus (identified by mass spectrometry); C-terminal deleted DUX4 cannot recruit p300 or induce H3K27Ac at target loci. DUX4 acts as a pioneer factor at inaccessible H3K27Ac-depleted MaLR-enriched chromatin, recruiting H3K27 acetyltransferase activity and opening loci for transcription, while simultaneously depleting H3K27Ac at distant strong peaks.","method":"Mass spectrometry co-IP, ChIP-seq (DUX4, H3, H3K27Ac, H3K4me3), C-terminal deletion and dominant-negative constructs, inducible DUX4 myoblast system","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — MS-based interaction discovery + ChIP-seq + deletion mutagenesis + dominant-negative competition, multiple orthogonal methods, functionally validated","pmids":["26951377"],"is_preprint":false},{"year":2016,"finding":"The DUX4 double homeodomain has a defined DNA-binding consensus with two tandem TAAT motifs separated by a C residue; a single TAAT half-site has no transcriptional activity; DUX4 does not bind the TAATTA motif in the Pitx1 promoter, challenging PITX1 as a direct DUX4 target gene. Transcriptional activation shows strong synergy with multiple binding sites.","method":"SELEX-like unbiased binding assays, electrophoretic mobility shift assay (EMSA), luciferase reporter assay with systematic mutagenesis","journal":"Skeletal muscle","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro DNA binding assays with systematic mutagenesis plus reporter assays, defined binding rules, single lab but comprehensive","pmids":["26823969"],"is_preprint":false},{"year":2016,"finding":"DUX4 and DUX4c interact with type III intermediate filament protein desmin in the cytoplasm and at the nuclear periphery, and with Z-disc protein LMCD1; they also interact with RNA-binding proteins C1QBP, SRSF9, RBM3, FUS/TLS, and SFPQ. DUX4/DUX4c are detected in the cytoplasm upon myoblast fusion and associate with nuclear buds.","method":"Yeast two-hybrid, HaloTag co-purification, GST pull-down, co-immunoprecipitation, co-immunofluorescence, proximity ligation assay (PLA)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal binding methods (Y2H, GST pulldown, co-IP, PLA), single lab","pmids":["26816005"],"is_preprint":false},{"year":2016,"finding":"DUX4-IGH fusion expression in mouse pro-B cells generates B cell leukemia in vivo (transplantation assay), demonstrating that the DUX4 double homeodomain can act as an oncogenic driver when overexpressed due to chromosomal rearrangement.","method":"RNA-seq, transplantation assay in mice (pro-B cell transformation), RT-PCR","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo transformation assay with defined molecular lesion, single lab but rigorous functional readout","pmids":["27019113"],"is_preprint":false},{"year":2016,"finding":"DUX4 rearrangement drives expression of ERGalt, a non-canonical ERG isoform, by binding to a DUX4-Responsive-Element (DRE) in a non-canonical first exon; ERGalt retains DNA-binding and transactivation domains but acts as a dominant-negative inhibitor of wild-type ERG and is transforming.","method":"RNA-seq, ChIP, reporter assays, ERGalt expression constructs, transformation assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating DUX4 binding to ERG non-canonical promoter, reporter assays, dominant-negative functional assays, replicated across multiple patient cohorts","pmids":["27776115"],"is_preprint":false},{"year":2017,"finding":"DUX4 and mouse DUX activate hundreds of cleavage-stage genes (e.g., ZSCAN4, KDM4E, PRAMEF-family) and MERVL/HERVL retrotransposons; mouse Dux expression is necessary and sufficient to convert mESCs into 2C-like cells (reactivation of 2C genes, loss of OCT4 protein/chromocenters, remodeling of chromatin to 2C state).","method":"ATAC-seq, RNA-seq, Dux overexpression and knockdown in mESCs, ChIP-seq, immunofluorescence","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — necessary and sufficient experiments (KO + OE), ATAC-seq chromatin remodeling, RNA-seq, multiple orthogonal methods, replicated by parallel paper","pmids":["28459457"],"is_preprint":false},{"year":2017,"finding":"Despite divergent binding motifs, human DUX4 and mouse DUX both activate cleavage-stage genes driven by conventional promoters in their respective species; retrotransposon-driven gene activation diverges between species correlating with homeodomain sequence divergence. Human DUX4 expressed in mouse cells does not activate MERVL-promoted genes.","method":"RNA-seq, ChIP-seq, cross-species expression experiments (human DUX4 in mouse cells), motif analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — cross-species expression with RNA-seq and ChIP-seq, two parallel labs publishing simultaneously, multiple orthogonal methods","pmids":["28459454"],"is_preprint":false},{"year":2017,"finding":"DUX4 expression causes accumulation of MYC mRNA, nuclear double-stranded RNA (dsRNA) foci with EIF4A3 aggregation, and activation of the dsRNA innate immune response pathway; siRNA screen identified MYC-mediated apoptotic pathway and dsRNA response as mediators of DUX4-induced apoptosis.","method":"siRNA screen (RD rhabdomyosarcoma inducible DUX4), RNA-seq, immunofluorescence for dsRNA foci and EIF4A3, MYC mRNA quantification","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA screen with validation, RNA-seq, immunofluorescence, single lab, multiple methods","pmids":["28273136"],"is_preprint":false},{"year":2017,"finding":"CIC-DUX4 fusion oncoprotein directly and neomorphically upregulates ETV4 and CCNE1 (cyclin E1), driving tumor metastasis and survival respectively; CCNE-CDK2 complex dependence renders CIC-DUX4 tumors sensitive to CDK2 inhibition.","method":"Gene silencing, gene expression profiling, xenograft mouse models, CIC-DUX4 transgenic mouse model (embryonic mesenchymal cells), CDK inhibitor treatment","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct transcriptional target identification, gene silencing with defined phenotypes, in vivo xenograft validation, single lab","pmids":["31329165"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of the tandem DUX4 homeodomains bound to DNA reveals head-to-head binding with linker making minor-groove contacts; despite being tandem duplicates, the two homeodomains recognize different core sequences due to a primate-specific arginine-to-glutamate mutation in the recognition helix of HD2. Mutational studies confirmed this primate-specific change drives divergent sequence recognition.","method":"X-ray crystallography, mutagenesis (alanine substitutions and R-to-E reversion), electrophoretic mobility shift assay","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure at atomic resolution combined with mutagenesis and EMSA validation, comprehensive mechanistic study","pmids":["30540931"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of the DUX4 second homeodomain (HD2) in apo and DNA-bound forms reveals a clamp-like transactivation mechanism; mutations in the DNA-binding interfaces impaired DUX4 DNA-binding affinity and abrogated DUX4/IGH transactivation activity and inhibitory effects on B-cell differentiation.","method":"X-ray crystallography (apo and DNA-bound structures), biophysical binding assays, mutagenesis, B-cell differentiation assay in mouse progenitors","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis plus functional cell-based validation, single lab, multiple orthogonal methods","pmids":["29572508"],"is_preprint":false},{"year":2018,"finding":"DUX4 functional domains were mapped: homeodomains are required for inhibiting myogenesis and MyoD expression but do not require the C-terminal activation domain; the C-terminal ~80 amino acids (especially the last 20) mediate transcriptional activation and cytotoxicity. Non-toxic homeodomain-containing constructs lacking the C-terminus can act as inhibitors of DUX4-FL by competing for promoter sites.","method":"DUX4 deletion/mutation/fusion constructs, DUX4 promoter reporter assay, ZSCAN4 expression, cell viability assay, caspase activation assay, ubiquitination assay","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — systematic domain deletion mutagenesis with multiple functional readouts, single lab","pmids":["29618456"],"is_preprint":false},{"year":2018,"finding":"The NuRD (Nucleosome Remodeling Deacetylase) and CAF-1 (Chromatin Assembly Factor 1) complexes are necessary for DUX4 repression in human skeletal muscle cells and iPSCs; DUX4-induced MBD3L proteins partly relieve this repression in FSHD muscle cells, providing a positive feedback mechanism for DUX4 amplification.","method":"CRISPR/Cas9-based enChIP locus-specific proteomics of D4Z4, siRNA knockdown of NuRD/CAF-1 components, DUX4 expression assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — enChIP-mass spectrometry for locus-specific protein identification, siRNA functional validation, multiple cell types, single lab with comprehensive approach","pmids":["29533181"],"is_preprint":false},{"year":2019,"finding":"DUX4 expression blocks interferon-γ-mediated induction of MHC class I gene expression, enabling immune evasion; re-expression of DUX4 in diverse cancers is associated with reduced cytolytic activity markers and lower MHC class I expression.","method":"IFN-γ stimulation assays with DUX4-expressing vs. control cancer cells, RNA-seq, clinical melanoma data correlation","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct experimental suppression of IFN-γ response by DUX4 in cell lines, RNA-seq, single lab","pmids":["31327741"],"is_preprint":false},{"year":2019,"finding":"DUX4-induced dsRNA foci are composed primarily of bidirectionally transcribed HSATII (human satellite II) pericentric repeat RNAs; DUX4 initiates bidirectional transcription of normally silenced HSATII repeats, and gapmer-mediated knockdown of HSATII transcripts depletes nuclear ribonucleoprotein aggregates and decreases DUX4-induced cell death.","method":"RNA-seq, immunofluorescence for dsRNA foci, gapmer antisense knockdown, co-localization of HSATII RNA with EIF4A3 and ADAR1","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic identification of dsRNA composition (RNA-seq), gapmer rescue establishing causal role of HSATII dsRNA in cell death, co-localization, single lab with multiple orthogonal methods","pmids":["31630170"],"is_preprint":false},{"year":2019,"finding":"DUX4-induced histone variants H3.X and H3.Y are incorporated throughout the body of DUX4-induced genes; following a brief DUX4 pulse, these histones contribute to greater perdurance and enhanced re-activation of DUX4 target gene expression, providing a chromatin memory mechanism.","method":"Doxycycline-inducible DUX4 myoblasts, CUT&RUN for H3.X/H3.Y, RNA-seq after DUX4 pulse, H3.X/H3.Y knockdown experiments","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CUT&RUN chromatin profiling, pulse-chase DUX4 induction, single lab, direct mechanistic link between histone incorporation and target gene memory","pmids":["31722199"],"is_preprint":false},{"year":2019,"finding":"p38α and p38β MAPK isoforms each independently and requisitely regulate DUX4 expression; pharmacological inhibition of p38α/β suppresses DUX4 mRNA expression and downstream target gene program in FSHD myoblasts and in mouse xenografts, as confirmed by RNA-seq profiling.","method":"siRNA knockdown of individual p38 isoforms, multiple selective p38α/β inhibitors, RNA-seq, FSHD1 and FSHD2 patient cells, xenograft model","journal":"The Journal of pharmacology and experimental therapeutics","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific siRNA knockdown establishing causal role, multiple orthogonal pharmacological inhibitors, RNA-seq, two independent patient cell lines, in vivo validation","pmids":["31189728"],"is_preprint":false},{"year":2020,"finding":"DUX4 expression in FSHD muscles leads to compromised NMD which results in translation of truncated proteins from NMD-targeted transcripts; RNA-binding proteins are enriched for aberrant truncations, and the truncated SRSF3 isoform is translated to a stable protein that itself confers toxicity—its downregulation is cytoprotective.","method":"Cell-based FSHD model (DUX4 induction), ribosome profiling, mass spectrometry, SRSF3 truncation construct expression, siRNA knockdown of truncated SRSF3, FSHD patient-derived myotube validation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ribosome profiling + MS to detect truncated proteins, gain-of-function and loss-of-function of truncated SRSF3, patient cell validation, multiple orthogonal methods","pmids":["37314931"],"is_preprint":false},{"year":2021,"finding":"p53 activates DUX4/Dux expression via a p53-binding site located in a primate-specific subtelomeric LTR10C element; the p53–DUX4 regulatory axis is conserved between mouse Dux and human DUX4, and this pathway operates in FSHD patient cells during p53 signaling.","method":"Long-read sequencing of Dux locus, CHIP-seq for p53 binding, DUX4/Dux induction upon p53 activation, p53 binding site mutation, FSHD patient-derived cell experiments","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — p53 binding site identified and mutated, conserved across species (mouse and human), FSHD patient cell validation, multiple orthogonal methods","pmids":["34267371"],"is_preprint":false},{"year":2021,"finding":"WDR5, a chromatin remodeling protein, is a direct interactor of the lncRNA DBE-T and is required for DUX4 expression and target gene activation in FSHD primary muscle cells; pharmacological WDR5 inhibition rescues cell viability and myogenic differentiation in FSHD patient cells.","method":"Affinity purification followed by proteomics, WDR5 siRNA knockdown, WDR5 pharmacological inhibitor, DUX4 and target gene expression assays, myogenic differentiation assay, viability assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomic interaction discovery, functional siRNA validation, pharmacological validation, patient cell rescue experiments, multiple orthogonal methods","pmids":["37021550"],"is_preprint":false},{"year":2021,"finding":"DUX4 promotes nuclear translocation of β-CATENIN and increases canonical WNT signalling; constitutive DUX4c expression prevents β-CATENIN nuclear accumulation and the downstream transcriptional program; blockade of WNT/β-CATENIN signalling rescues viability of FSHD myoblasts.","method":"DUX4 and DUX4c expression constructs, β-catenin nuclear fractionation/immunofluorescence, WNT pathway inhibitor treatment, cell viability assay, FSHD myoblast rescue","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular localization of β-catenin, pharmacological rescue, antagonism experiments with DUX4c, single lab","pmids":["36158201"],"is_preprint":false},{"year":2022,"finding":"DUX4 interacts with the Mediator complex via a C-terminal KIX binding motif; DUX4 expression substantially alters chromatin accessibility (ATAC-seq) and activates thousands of transcribed enhancer-like regions preferentially within ERVL-MaLR repeat elements; CRISPR activation of these enhancer regions via C-terminal DUX4 motifs increases expression of EGA genes ZSCAN4 and KHDC1P1.","method":"ATAC-seq, CRISPR activation, DUX4 knockdown in human zygotes (transcriptome analysis), immunofluorescence in zygotes, protein co-IP/interaction for Mediator complex","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ATAC-seq, CRISPR activation, co-IP for Mediator interaction, DUX4 knockdown in zygotes, single lab, multiple methods","pmids":["35402882"],"is_preprint":false},{"year":2023,"finding":"DUX4 protein directly interacts with STAT1 via conserved (L)LxxL(L) motifs in its C-terminal region, and this interaction requires STAT1 Y701 phosphorylation; DUX4 broadly suppresses IFN-γ-stimulated gene expression by decreasing STAT1 and Pol-II recruitment at ISG promoters. This mechanism is conserved (mouse Dux also interacts with STAT1), and operates in FSHD muscle cells and CIC-DUX4 sarcoma.","method":"Co-IP (DUX4-STAT1 interaction), C-terminal motif mutagenesis, RNA-seq after IFN-γ stimulation ± DUX4, ChIP for STAT1 and Pol-II at ISG promoters, FSHD patient cell validation, sarcoma cell line validation","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP, mutagenesis of interaction motifs, ChIP-seq, multiple cell contexts validated, conserved in mouse, multiple orthogonal methods","pmids":["37092726"],"is_preprint":false},{"year":2021,"finding":"CIC-DUX4 fusion requires P300/CBP to induce histone H3 acetylation and activate its transcriptional targets; pharmacological P300/CBP inhibition (iP300w) suppresses CIC-DUX4 transcriptional activity, reverses induced H3 acetylation, induces cell cycle arrest in CDS cell lines, and prevents growth of CDS xenograft tumors in vivo.","method":"P300/CBP inhibitor treatment, H3 acetylation ChIP, transcriptional reporter assays, xenograft mouse model, cell viability assay","journal":"Oncogenesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — pharmacological and ChIP-based mechanistic validation, in vivo xenograft, multiple CDS cell lines, demonstrates P300/CBP-dependence of CIC-DUX4 activity","pmids":["34642317"],"is_preprint":false},{"year":2016,"finding":"DUX4 controls CXCR4 and CXCL12/SDF1 expression in myoblasts; DUX4 overexpression increases mesenchymal stem cell migration in a Transwell assay, and this effect is blocked by antibodies against SDF1 and CXCR4, placing DUX4 upstream of the CXCR4-SDF1 axis in regulating cell migration.","method":"Transcriptome profiling (microarray), Transwell migration assay, antibody blocking, DUX4 overexpression in myoblasts and BMSCs","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional migration assay with antibody blockade, transcriptome profiling, single lab, single method for functional readout","pmids":["27556182"],"is_preprint":false},{"year":2017,"finding":"DUX4 homeodomains are necessary and sufficient for inhibition of myogenesis and induction of cytotoxicity; substitution mutants in which both DUX4 homeodomains are replaced by Pax7 homeodomains retain the ability to inhibit differentiation and induce cytotoxicity. Among related homeodomain proteins, only Pax3 and Pax7 (not Pax6, Pitx2c, OTX1, Rax, Hesx1, MIXL1, Tbx1) display phenotypic competition with DUX4, requiring the paired and transcriptional activation domains of Pax3 in addition to its homeodomain.","method":"Expression of homeodomain swap and deletion constructs, C2C12 differentiation assays, cytotoxicity assay, domain analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic domain swap mutagenesis, multiple construct comparisons, functional phenotypic readouts, single lab","pmids":["28935672"],"is_preprint":false},{"year":2020,"finding":"DUX4-induced toxicity in C2C12 myoblasts and in the inducible mouse model is not p53-dependent: p53 inhibition has no effect on DUX4 cytotoxicity; DUX4 does not activate the canonical p53 pathway; p21/Cdkn1a induction by DUX4 is mouse-specific and p53-independent. The DUX4 inducible mouse crossed onto p53-null background shows no suppression of male-specific lethality or skin phenotypes.","method":"C2C12 cytotoxicity assay with p53 inhibitor, meta-analysis of 5 DUX4 transcriptional datasets, p53-null mouse cross with inducible DUX4 transgene, primary myoblast killing assay","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — negative result well-supported by multiple models (in vitro + in vivo p53-null genetic epistasis), meta-analysis, single lab; directly contradicts earlier p53-dependence claim","pmids":["28754837"],"is_preprint":false},{"year":2013,"finding":"NFE2L3 functions as a regulator that links NF-κB/RELA signaling to CDK1 activity via DUX4; NFE2L3 knockdown results in increased DUX4 levels, and DUX4 functions as a direct inhibitor of CDK1, thereby controlling cell cycle progression in colon cancer cells.","method":"NFE2L3 siRNA knockdown, DUX4 expression measurement, CDK1 activity assays, cell proliferation assay in vitro, tumor growth in vivo","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function knockdown with specific molecular target (CDK1), in vitro and in vivo validation, single lab","pmids":["31693889"],"is_preprint":false}],"current_model":"DUX4 is a double-homeodomain transcription factor that normally drives zygotic genome activation in cleavage-stage embryos by binding TAAT-containing motifs (head-to-head homeodomain configuration defined by crystal structure) to activate germline genes and ERVL/MaLR retrotransposons via recruitment of p300/CBP histone acetyltransferases and the Mediator complex through its C-terminal domain; in FSHD skeletal muscle, pathological mis-expression triggers a cascade that includes NMD inhibition via UPF1 degradation, bidirectional HSATII satellite repeat transcription producing cytotoxic dsRNA, TDP-43 aggregation, induction of muscle atrophy ubiquitin ligases (MuRF1/Atrogin1) via the ubiquitin-proteasome pathway, p53-independent G1 arrest via Sp1-mediated p21 upregulation, β-catenin nuclear translocation activating WNT signaling, and STAT1 sequestration that broadly suppresses IFN-γ-stimulated gene expression; DUX4 expression is controlled epigenetically through SMCHD1/NuRD/CAF-1/PRC2-mediated chromatin repression at D4Z4, is activated by p53 via an LTR10C-embedded p53-binding site and by p38α/β MAPK signaling, and is amplified by a positive feedback loop in which DUX4-induced MBD3L proteins disrupt NuRD-mediated D4Z4 silencing and NMD inhibition stabilizes DUX4 mRNA."},"narrative":{"mechanistic_narrative":"DUX4 is a double-homeodomain transcription factor that functions as a pioneer factor to drive a cleavage-stage/early embryonic gene expression program, activating germline and 2C-like genes (ZSCAN4, KDM4E, PRAMEF family) and ERVL/MaLR-class endogenous retrotransposons, with mouse Dux being necessary and sufficient to convert mESCs to a 2C-like state [PMID:28459457, PMID:22209328]. Its tandem homeodomains bind DNA in a head-to-head configuration recognizing two TAAT cores separated by a spacer; a primate-specific arginine-to-glutamate substitution in the recognition helix of the second homeodomain causes the two domains to read divergent sequences, explaining species-specific retrotransposon target divergence [PMID:30540931, PMID:26823969, PMID:28459454]. Transcriptional activation and cytotoxicity are separable from DNA binding and map to a C-terminal activation domain that recruits p300/CBP histone acetyltransferases and the Mediator complex (via a KIX-binding motif), driving H3K27 acetylation and chromatin opening at target loci, while the homeodomains alone suffice to inhibit MyoD-dependent myogenesis [PMID:26951377, PMID:35402882, PMID:29618456, PMID:18833193]. Pathological mis-expression of DUX4 is intrinsically cytotoxic, inducing caspase-dependent apoptosis, oxidative stress sensitization, and a cascade of downstream insults: degradation of the NMD factor UPF1 (with DUX4 mRNA itself an NMD substrate, forming a stabilizing feedback loop and generating toxic truncated proteins such as SRSF3) [PMID:25564732, PMID:37314931], bidirectional transcription of HSATII pericentric satellite repeats producing cytotoxic nuclear dsRNA foci [PMID:31630170, PMID:28273136], TDP-43 aggregation linked to ubiquitin-proteasome dysfunction [PMID:25750920, PMID:23206257], and induction of muscle atrophy E3 ligases MuRF1/Atrogin1 [PMID:22053214]. DUX4 also suppresses immunity by directly binding phospho-STAT1 to block IFN-γ-stimulated gene and MHC class I induction [PMID:37092726, PMID:31327741]. DUX4 expression is normally restrained by NuRD/CAF-1-mediated chromatin repression at D4Z4, relieved by DUX4-induced MBD3L proteins in a feed-forward loop, and is positively driven by p38α/β MAPK signaling, a p53-binding LTR10C element, WDR5, and muscle-specific enhancers [PMID:29533181, PMID:31189728, PMID:34267371, PMID:37021550, PMID:24636994]. As an oncogenic driver, DUX4 chromosomal rearrangements and fusions (DUX4-IGH, CIC-DUX4, ERG rearrangement) transform cells through neomorphic transcriptional activation of targets including ETV4, CCNE1, and ERGalt [PMID:27019113, PMID:31329165, PMID:27776115, PMID:34642317].","teleology":[{"year":2007,"claim":"Established DUX4 as a sequence-specific transcriptional activator, defining its molecular identity as a TAAT-binding factor.","evidence":"EMSA, site-directed mutagenesis, and luciferase reporter in C2C12 cells on a Pitx1 promoter element","pmids":["17984056"],"confidence":"High","gaps":["Whether PITX1 is a genuine direct target was later challenged","Genome-wide binding not addressed"]},{"year":2008,"claim":"Showed DUX4 is intrinsically cytotoxic and anti-myogenic, repressing MyoD and the glutathione redox pathway, with Pax3/Pax7 antagonism implicating homeodomain competition.","evidence":"Isogenic titratable myoblast expression system with expression profiling and Pax3/Pax7 rescue","pmids":["18833193"],"confidence":"High","gaps":["Direct vs indirect target distinction not resolved","Mechanism of Pax competition not defined at the chromatin level"]},{"year":2010,"claim":"Demonstrated that myopathic activity requires DNA binding, linking the transcription-factor function directly to in vivo pathology.","evidence":"DNA-binding mutant plus p53-null cross in zebrafish and mouse muscle models","pmids":["21446026"],"confidence":"High","gaps":["p53-dependence was later contradicted by other models","Identity of direct toxic target genes not established"]},{"year":2011,"claim":"Connected DUX4 to retrotransposon biology and innate immune modulation, broadening its role beyond single protein-coding targets.","evidence":"ChIP-seq, expression profiling, and reporter assays in muscle cells, including DEFB103 activation; plus atrophy ligase induction and ASO knockdown","pmids":["22209328","22053214"],"confidence":"High","gaps":["How retrotransposon activation contributes to toxicity not yet causal","Mechanism of immune suppression unresolved at this stage"]},{"year":2012,"claim":"Characterized the rarity and intercellular spread of DUX4 protein and its ubiquitin-proteasome-regulated stability, informing the burst-like nature of expression.","evidence":"Quantitative immunodetection, nuclear scoring, and proteasome inhibitor stability assays in FSHD cells","pmids":["23206257"],"confidence":"Medium","gaps":["Mechanism of nuclear diffusion unproven","E3 ligase mediating DUX4 turnover not identified"]},{"year":2014,"claim":"Defined tissue-specific transcriptional control via muscle enhancers and a p53-independent G1 arrest mechanism through Sp1-driven p21.","evidence":"3C chromatin looping and ChIP for DME1/DME2 enhancers; flow cytometry, p21 reporter, Sp1 site mutation and ChIP","pmids":["24636994","24589735"],"confidence":"High","gaps":["p21/Sp1 mechanism later shown to be mouse-specific","Enhancer activation triggers not fully defined"]},{"year":2015,"claim":"Uncovered NMD inhibition via UPF1 degradation as a core toxicity and feedback mechanism, and linked DUX4 to TDP-43 aggregation and proteostasis collapse.","evidence":"DUX4-inducible cell systems with RNA-seq, NMD reporters, UPF1 quantification, fractionation, and proteasome inhibition","pmids":["25564732","25750920"],"confidence":"High","gaps":["Mechanism by which DUX4 triggers UPF1 degradation unresolved","Direct vs indirect cause of TDP-43 aggregation unclear"]},{"year":2016,"claim":"Mapped the molecular basis of DUX4 transcriptional activation to C-terminal recruitment of p300/CBP and its pioneer-factor behavior at MaLR chromatin, and refined its DNA-binding code.","evidence":"Mass-spec co-IP, ChIP-seq, C-terminal deletion/dominant-negative constructs; SELEX-like binding with systematic mutagenesis","pmids":["26951377","26823969"],"confidence":"High","gaps":["Stoichiometry of p300/CBP recruitment not defined","Pioneer-factor nucleosome engagement mechanism not structurally resolved"]},{"year":2016,"claim":"Established the DUX4 double homeodomain as an oncogenic driver through chromosomal rearrangements producing neomorphic transcription.","evidence":"DUX4-IGH pro-B transplantation leukemia model and DUX4-driven ERGalt dominant-negative transformation assays","pmids":["27019113","27776115"],"confidence":"High","gaps":["Full target repertoire of fusion oncoproteins incomplete","Relationship between FSHD and oncogenic programs not directly compared"]},{"year":2016,"claim":"Identified cytoplasmic and cytoskeletal/RNA-binding-protein interactions, suggesting non-nuclear roles or sequestration of DUX4/DUX4c.","evidence":"Y2H, HaloTag co-purification, GST pulldown, co-IP, and PLA identifying desmin, LMCD1, FUS, SFPQ, and others","pmids":["26816005"],"confidence":"Medium","gaps":["Functional consequence of cytoplasmic interactions undefined","Some interactions lack reciprocal in vivo validation"]},{"year":2017,"claim":"Defined DUX4 as the master activator of zygotic/2C-like genome activation, conserved with mouse Dux but with species-divergent retrotransposon targeting.","evidence":"ATAC-seq, RNA-seq, ChIP-seq, and necessary-and-sufficient Dux KO/OE in mESCs plus cross-species expression","pmids":["28459457","28459454"],"confidence":"High","gaps":["In vivo requirement during human embryogenesis not directly tested here","Basis for promoter vs retrotransposon target divergence not yet structural"]},{"year":2017,"claim":"Linked DUX4 toxicity to MYC induction and dsRNA innate immune activation, and dissected which domains drive cytotoxicity versus differentiation block.","evidence":"siRNA screen with RNA-seq and dsRNA/EIF4A3 imaging; homeodomain-swap and deletion constructs in C2C12","pmids":["28273136","28935672"],"confidence":"Medium","gaps":["Source of dsRNA not yet identified at this stage","Relative contribution of each toxic pathway to cell death not quantified"]},{"year":2018,"claim":"Resolved the structural basis of tandem-homeodomain DNA recognition, explaining a primate-specific mutation driving divergent half-site specificity and a clamp-like activation mechanism.","evidence":"X-ray crystallography of the tandem and HD2 domains with mutagenesis, EMSA, and B-cell differentiation assays","pmids":["30540931","29572508"],"confidence":"High","gaps":["Structure of full-length DUX4 with cofactors not solved","How DNA binding couples to p300/Mediator recruitment not structurally shown"]},{"year":2018,"claim":"Identified NuRD/CAF-1 chromatin complexes as the repressive machinery silencing D4Z4 and a MBD3L-driven feed-forward loop relieving that repression.","evidence":"CRISPR/Cas9 enChIP locus-specific proteomics of D4Z4 with siRNA functional validation","pmids":["29533181"],"confidence":"High","gaps":["Trigger that initiates the first de-repression event unclear","Quantitative contribution of MBD3L feedback in vivo not defined"]},{"year":2019,"claim":"Reconciled the toxicity pathway by identifying bidirectionally transcribed HSATII satellite RNA as the causal dsRNA species driving cell death.","evidence":"RNA-seq, dsRNA imaging, and gapmer knockdown rescuing DUX4-induced death","pmids":["31630170"],"confidence":"High","gaps":["How DUX4 initiates HSATII bidirectional transcription not mechanistically defined","Sensor mediating dsRNA toxicity not pinpointed"]},{"year":2019,"claim":"Revealed a histone-variant-based chromatin memory mechanism (H3.X/H3.Y) enabling target gene re-activation after transient DUX4 pulses.","evidence":"Doxycycline-inducible DUX4 myoblasts with CUT&RUN and pulse-chase RNA-seq plus knockdown","pmids":["31722199"],"confidence":"Medium","gaps":["Deposition machinery for H3.X/H3.Y not identified","Persistence duration in patient cells unknown"]},{"year":2019,"claim":"Established upstream signaling control of DUX4 by p38α/β MAPK and downstream immune-evasion and metastatic programs across FSHD and cancer.","evidence":"Isoform-specific p38 siRNA and inhibitors with RNA-seq and xenografts; IFN-γ/MHC-I suppression assays; CIC-DUX4 ETV4/CCNE1 targeting; CXCR4-SDF1 migration assay","pmids":["31189728","31327741","31329165","27556182"],"confidence":"High","gaps":["How p38 signaling intersects D4Z4 chromatin not detailed","Direct vs indirect immune-target relationships incompletely mapped"]},{"year":2020,"claim":"Challenged the earlier p53-dependence of DUX4 toxicity and demonstrated translation of toxic truncated proteins from NMD-compromised transcripts.","evidence":"p53-null mouse cross and inhibitor assays with transcriptomic meta-analysis; ribosome profiling, MS, and SRSF3-truncation gain/loss-of-function","pmids":["28754837","37314931"],"confidence":"Medium","gaps":["Reconciliation of conflicting p53 results across models incomplete","Full set of toxic truncated proteins not catalogued"]},{"year":2021,"claim":"Defined a conserved p53-LTR10C activation axis and additional regulators (WDR5, WNT/β-catenin) controlling DUX4 expression and toxicity.","evidence":"p53 ChIP-seq and binding-site mutation across species; WDR5 proteomics/inhibitor rescue; β-catenin fractionation and WNT inhibitor rescue; CIC-DUX4 p300/CBP dependence","pmids":["34267371","37021550","36158201","34642317"],"confidence":"High","gaps":["Integration of multiple upstream activators into a single regulatory logic unclear","Tissue specificity of these axes in vivo incompletely tested"]},{"year":2022,"claim":"Connected DUX4 to the Mediator complex and genome-wide enhancer activation within ERVL-MaLR elements during embryonic genome activation.","evidence":"ATAC-seq, CRISPR activation of enhancer regions, Mediator co-IP, and DUX4 knockdown in human zygotes","pmids":["35402882"],"confidence":"Medium","gaps":["KIX-Mediator interaction interface not structurally resolved","Causal contribution of each enhancer to embryonic development untested"]},{"year":2023,"claim":"Defined the direct molecular mechanism of DUX4-mediated immune evasion through phospho-STAT1 binding and blockade of ISG transcription.","evidence":"Co-IP with C-terminal motif mutagenesis, IFN-γ RNA-seq, STAT1/Pol-II ChIP, across FSHD and CIC-DUX4 sarcoma cells, conserved in mouse","pmids":["37092726"],"confidence":"High","gaps":["Stoichiometry and structure of the DUX4-STAT1 complex unknown","Therapeutic exploitation in tumors untested"]},{"year":null,"claim":"How the multiple upstream activators (p53, p38 MAPK, WDR5, NuRD/CAF-1 derepression) integrate to produce the rare, stochastic bursts of DUX4 in FSHD muscle, and which single intervention point most effectively halts the downstream toxic cascade, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking chromatin state, signaling, and burst kinetics","Relative therapeutic priority among UPF1/NMD, HSATII dsRNA, p38, and WNT axes undetermined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,4,11,16,22,32]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,3,12,20,21]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[33,24]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,6]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,11,16,32]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[9,28]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[24,33,18]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[7,19,38]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[11,23,26]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,15,19]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,18,25]}],"complexes":[],"partners":["EP300","CREBBP","STAT1","UPF1","WDR5","DES","FUS","SFPQ"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UBX2","full_name":"Double homeobox protein 4","aliases":["Double homeobox protein 10"],"length_aa":424,"mass_kda":44.9,"function":"Transcription factor that is selectively and transiently expressed in cleavage-stage embryos (PubMed:28459457). Binds to double-stranded DNA elements with the consensus sequence 5'-TAATCTAATCA-3' (PubMed:28459454, PubMed:28459457, PubMed:29572508, PubMed:30315230, PubMed:30540931). Binds to chromatin containing histone H3 acetylated at 'Lys-27' (H3K27ac) and promotes deacetylation of H3K27ac. In parallel, binds to chromatin that lacks histone H3 acetylation at 'Lys-27' (H3K27ac) and recruits EP300 and CREBBP to promote acetylation of histone H3 at 'Lys-27' at new sites (PubMed:26951377). Involved in transcriptional regulation of numerous genes, primarily as transcriptional activator, but also mediates repression of a set of target genes (PubMed:17984056, PubMed:26951377, PubMed:27378237, PubMed:28459454, PubMed:28459457, PubMed:29572508, PubMed:29618456, PubMed:30540931). Promotes expression of ZSCAN4 and KDM4E, two proteins with essential roles during early embryogenesis (PubMed:26951377, PubMed:27378237, PubMed:28459457, PubMed:29618456). Promotes nuclear translocation of CTNNB1/beta-catenin and its subsequent activation of target genes (PubMed:36158201). Heterologous expression in cultured embryonic stem cells mediates transcription of HERVL retrotransposons and transcripts derived from ACRO1 and HSATII satellite repeats (PubMed:28459457). May activate expression of PITX1 (PubMed:17984056). May regulate microRNA (miRNA) expression (PubMed:24145033). Inappropriate expression can inhibit myogenesis and promote apoptosis (PubMed:26951377, PubMed:28935672, PubMed:29618456) Probably inactive as a transcriptional activator, due to the absence of the C-terminal region that is important for transcriptional activation. Can inhibit transcriptional activation mediated by isoform 1. Heterologous expression of isoform 2 has no deleterious effect on cell survival","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UBX2/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DUX4"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DUX4","total_profiled":1310},"omim":[{"mim_id":"619478","title":"FACIOSCAPULOHUMERAL MUSCULAR DYSTROPHY 4, DIGENIC; FSHD4","url":"https://www.omim.org/entry/619478"},{"mim_id":"619477","title":"FACIOSCAPULOHUMERAL MUSCULAR DYSTROPHY 3, DIGENIC; FSHD3","url":"https://www.omim.org/entry/619477"},{"mim_id":"618700","title":"CYTOPLASMIC POLYADENYLATED HOMEOBOX-LIKE; CPHXL","url":"https://www.omim.org/entry/618700"},{"mim_id":"615581","title":"DOUBLE HOMEOBOX 4-LIKE 9; DUX4L9","url":"https://www.omim.org/entry/615581"},{"mim_id":"615354","title":"LIGAND-DEPENDENT NUCLEAR RECEPTOR-INTERACTING FACTOR 1; LRIF1","url":"https://www.omim.org/entry/615354"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Not detected","tissue_distribution":"Not detected","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DUX4"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9UBX2","domains":[{"cath_id":"1.10.10.60","chopping":"29-82","consensus_level":"high","plddt":97.2848,"start":29,"end":82},{"cath_id":"1.10.10.60","chopping":"104-149","consensus_level":"high","plddt":96.8643,"start":104,"end":149}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBX2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBX2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBX2-F1-predicted_aligned_error_v6.png","plddt_mean":61.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DUX4","jax_strain_url":"https://www.jax.org/strain/search?query=DUX4"},"sequence":{"accession":"Q9UBX2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UBX2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UBX2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBX2"}},"corpus_meta":[{"pmid":"28459457","id":"PMC_28459457","title":"Conserved 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FSHD?","date":"2020","source":"Journal of personalized medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33374516","citation_count":16,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49874,"output_tokens":10042,"usd":0.150126,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":20439,"output_tokens":6584,"usd":0.133398,"stage2_stop_reason":"end_turn"},"total_usd":0.283524,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"DUX4 functions as a transcriptional activator of PITX1; it binds a specific 30-bp sequence in the Pitx1 promoter (containing a TAAT core motif) as demonstrated by EMSA, and mutations of the TAAT core abolished both DUX4 binding in vitro and Pitx1-luciferase reporter activation in C2C12 cells.\",\n      \"method\": \"Luciferase reporter assay, EMSA, site-directed mutagenesis, transfection in C2C12 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding assay (EMSA) plus mutagenesis plus reporter assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17984056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DUX4 localizes to the nucleus and its overexpression induces caspase 3/7-dependent apoptosis and alters emerin distribution at the nuclear envelope.\",\n      \"method\": \"CMV-DUX4 transfection, caspase 3/7 activity assay, immunofluorescence localization, nuclear fractionation\",\n      \"journal\": \"Neuromuscular disorders : NMD\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment, caspase activity assay with functional consequence (cell death), single lab, multiple readouts\",\n      \"pmids\": [\"17588759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DUX4 expression represses MyoD and its target genes, diminishes myogenic differentiation, represses glutathione redox pathway components, and sensitizes cells to oxidative stress; DUX4 toxicity is antagonized by high-level expression of Pax3 or Pax7, suggesting competitive interaction via related homeodomains.\",\n      \"method\": \"Inducible cassette exchange isogenic myoblast expression screen, gene expression profiling, Pax3/Pax7 co-expression rescue experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isogenic cell system with titratable expression, multiple molecular readouts, competition rescue experiments, replicated by subsequent studies\",\n      \"pmids\": [\"18833193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DUX4 myopathic activity in vivo requires intact DNA binding (a DNA-binding domain mutant caused no muscle abnormalities), and DUX4-induced myopathy in mice is p53-dependent (p53-null muscles are resistant to DUX4-induced damage).\",\n      \"method\": \"Transposon-mediated transgenesis in zebrafish, AAV delivery in mouse muscle, DNA-binding domain mutant, p53-null mouse cross\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function mutagenesis (DNA-binding mutant), genetic epistasis (p53-null), two animal models, multiple orthogonal methods\",\n      \"pmids\": [\"21446026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DUX4 activates germline and early stem cell genes, binds and activates LTR elements from MaLR endogenous primate retrotransposons, and suppresses the innate immune response to viral infection at least partly through activation of DEFB103 (a human defensin that can inhibit muscle differentiation).\",\n      \"method\": \"ChIP-seq, gene expression profiling, reporter assays, DUX4 transfection in muscle cells\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq plus expression profiling plus reporter assays, replicated across multiple subsequent studies\",\n      \"pmids\": [\"22209328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"DUX4 expression in myoblasts induces atrophic myotube formation associated with induction of E3 ubiquitin ligases MuRF1 and Atrogin1/MAFbx; siRNA and antisense oligonucleotides targeting DUX4 mRNA suppressed DUX4 protein and reduced downstream target expression in FSHD myoblasts.\",\n      \"method\": \"DUX4 expression vector transfection, siRNA/antisense knockdown, qRT-PCR, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function (siRNA/ASO) with specific molecular phenotype (ubiquitin ligase induction, atrophy markers), single lab, multiple methods\",\n      \"pmids\": [\"22053214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DUX4 protein is expressed in only ~1/1000 FSHD myoblasts but ~1/200 myotube nuclei; DUX4 and its target PITX1 show protein staining gradients across consecutive myonuclei suggesting diffusion between nuclei; both protein half-lives are regulated by the ubiquitin-proteasome pathway.\",\n      \"method\": \"Immunodetection, quantitative nuclear scoring, proteasome inhibitor treatment, protein stability assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein localization with nuclear gradient quantification, proteasome inhibitor experiments demonstrating ubiquitin-proteasome regulation, single lab\",\n      \"pmids\": [\"23206257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DUX4 induces G1 cell cycle arrest by upregulating p21 expression in a p53-independent manner via increased Sp1 transcription factor binding to the p21 promoter; ChIP confirmed DUX4-induced Sp1 binding to the p21 promoter in vivo.\",\n      \"method\": \"Cell cycle analysis (flow cytometry), p21 promoter-luciferase reporter, Sp1 binding site mutation, ChIP assay, p21 siRNA rescue\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP, reporter assay with mutagenesis, siRNA rescue, single lab\",\n      \"pmids\": [\"24589735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DUX4 expression is driven by two muscle-specific enhancers (DME1 and DME2) that physically interact with the DUX4 promoter in skeletal myocytes (confirmed by chromosome conformation capture) but not in fibroblasts, explaining muscle-tissue specificity of DUX4-fl expression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), chromosome conformation capture (3C), nucleosome occupancy and methylome sequencing, luciferase reporters\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — 3C chromatin looping, ChIP for histone marks and RNA Pol II, multiple orthogonal chromatin methods, single lab\",\n      \"pmids\": [\"24636994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DUX4 protein triggers proteolytic degradation of UPF1, a central NMD component, causing profound NMD inhibition and global accumulation of NMD substrate RNAs; DUX4 mRNA is itself an NMD substrate, creating a double-negative feedback loop that stabilizes DUX4 mRNA.\",\n      \"method\": \"DUX4-inducible cell system, RNA-seq, UPF1 protein quantification, NMD reporter assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic epistasis (UPF1 degradation → NMD loss → DUX4 mRNA stabilization), RNA-seq, multiple orthogonal assays, replicated in subsequent work\",\n      \"pmids\": [\"25564732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DUX4-FL expression inhibits protein turnover via the ubiquitin-proteasome system and induces TDP-43 aggregation in expressing nuclei; the non-toxic short isoform DUX4-S does not cause these changes. Proteasome inhibition with MG132 phenocopies TDP-43 aggregation.\",\n      \"method\": \"Exogenous BacMam DUX4-FL expression, immunofluorescence, insoluble protein fractionation, proteasome inhibitor treatment\",\n      \"journal\": \"Annals of clinical and translational neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein localization, fractionation, pharmacological phenocopy, isoform comparison, single lab\",\n      \"pmids\": [\"25750920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUX4 recruits the histone acetyltransferases p300/CBP through its C-terminus (identified by mass spectrometry); C-terminal deleted DUX4 cannot recruit p300 or induce H3K27Ac at target loci. DUX4 acts as a pioneer factor at inaccessible H3K27Ac-depleted MaLR-enriched chromatin, recruiting H3K27 acetyltransferase activity and opening loci for transcription, while simultaneously depleting H3K27Ac at distant strong peaks.\",\n      \"method\": \"Mass spectrometry co-IP, ChIP-seq (DUX4, H3, H3K27Ac, H3K4me3), C-terminal deletion and dominant-negative constructs, inducible DUX4 myoblast system\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — MS-based interaction discovery + ChIP-seq + deletion mutagenesis + dominant-negative competition, multiple orthogonal methods, functionally validated\",\n      \"pmids\": [\"26951377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The DUX4 double homeodomain has a defined DNA-binding consensus with two tandem TAAT motifs separated by a C residue; a single TAAT half-site has no transcriptional activity; DUX4 does not bind the TAATTA motif in the Pitx1 promoter, challenging PITX1 as a direct DUX4 target gene. Transcriptional activation shows strong synergy with multiple binding sites.\",\n      \"method\": \"SELEX-like unbiased binding assays, electrophoretic mobility shift assay (EMSA), luciferase reporter assay with systematic mutagenesis\",\n      \"journal\": \"Skeletal muscle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro DNA binding assays with systematic mutagenesis plus reporter assays, defined binding rules, single lab but comprehensive\",\n      \"pmids\": [\"26823969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUX4 and DUX4c interact with type III intermediate filament protein desmin in the cytoplasm and at the nuclear periphery, and with Z-disc protein LMCD1; they also interact with RNA-binding proteins C1QBP, SRSF9, RBM3, FUS/TLS, and SFPQ. DUX4/DUX4c are detected in the cytoplasm upon myoblast fusion and associate with nuclear buds.\",\n      \"method\": \"Yeast two-hybrid, HaloTag co-purification, GST pull-down, co-immunoprecipitation, co-immunofluorescence, proximity ligation assay (PLA)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal binding methods (Y2H, GST pulldown, co-IP, PLA), single lab\",\n      \"pmids\": [\"26816005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUX4-IGH fusion expression in mouse pro-B cells generates B cell leukemia in vivo (transplantation assay), demonstrating that the DUX4 double homeodomain can act as an oncogenic driver when overexpressed due to chromosomal rearrangement.\",\n      \"method\": \"RNA-seq, transplantation assay in mice (pro-B cell transformation), RT-PCR\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transformation assay with defined molecular lesion, single lab but rigorous functional readout\",\n      \"pmids\": [\"27019113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUX4 rearrangement drives expression of ERGalt, a non-canonical ERG isoform, by binding to a DUX4-Responsive-Element (DRE) in a non-canonical first exon; ERGalt retains DNA-binding and transactivation domains but acts as a dominant-negative inhibitor of wild-type ERG and is transforming.\",\n      \"method\": \"RNA-seq, ChIP, reporter assays, ERGalt expression constructs, transformation assays\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating DUX4 binding to ERG non-canonical promoter, reporter assays, dominant-negative functional assays, replicated across multiple patient cohorts\",\n      \"pmids\": [\"27776115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DUX4 and mouse DUX activate hundreds of cleavage-stage genes (e.g., ZSCAN4, KDM4E, PRAMEF-family) and MERVL/HERVL retrotransposons; mouse Dux expression is necessary and sufficient to convert mESCs into 2C-like cells (reactivation of 2C genes, loss of OCT4 protein/chromocenters, remodeling of chromatin to 2C state).\",\n      \"method\": \"ATAC-seq, RNA-seq, Dux overexpression and knockdown in mESCs, ChIP-seq, immunofluorescence\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — necessary and sufficient experiments (KO + OE), ATAC-seq chromatin remodeling, RNA-seq, multiple orthogonal methods, replicated by parallel paper\",\n      \"pmids\": [\"28459457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Despite divergent binding motifs, human DUX4 and mouse DUX both activate cleavage-stage genes driven by conventional promoters in their respective species; retrotransposon-driven gene activation diverges between species correlating with homeodomain sequence divergence. Human DUX4 expressed in mouse cells does not activate MERVL-promoted genes.\",\n      \"method\": \"RNA-seq, ChIP-seq, cross-species expression experiments (human DUX4 in mouse cells), motif analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cross-species expression with RNA-seq and ChIP-seq, two parallel labs publishing simultaneously, multiple orthogonal methods\",\n      \"pmids\": [\"28459454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DUX4 expression causes accumulation of MYC mRNA, nuclear double-stranded RNA (dsRNA) foci with EIF4A3 aggregation, and activation of the dsRNA innate immune response pathway; siRNA screen identified MYC-mediated apoptotic pathway and dsRNA response as mediators of DUX4-induced apoptosis.\",\n      \"method\": \"siRNA screen (RD rhabdomyosarcoma inducible DUX4), RNA-seq, immunofluorescence for dsRNA foci and EIF4A3, MYC mRNA quantification\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA screen with validation, RNA-seq, immunofluorescence, single lab, multiple methods\",\n      \"pmids\": [\"28273136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CIC-DUX4 fusion oncoprotein directly and neomorphically upregulates ETV4 and CCNE1 (cyclin E1), driving tumor metastasis and survival respectively; CCNE-CDK2 complex dependence renders CIC-DUX4 tumors sensitive to CDK2 inhibition.\",\n      \"method\": \"Gene silencing, gene expression profiling, xenograft mouse models, CIC-DUX4 transgenic mouse model (embryonic mesenchymal cells), CDK inhibitor treatment\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcriptional target identification, gene silencing with defined phenotypes, in vivo xenograft validation, single lab\",\n      \"pmids\": [\"31329165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of the tandem DUX4 homeodomains bound to DNA reveals head-to-head binding with linker making minor-groove contacts; despite being tandem duplicates, the two homeodomains recognize different core sequences due to a primate-specific arginine-to-glutamate mutation in the recognition helix of HD2. Mutational studies confirmed this primate-specific change drives divergent sequence recognition.\",\n      \"method\": \"X-ray crystallography, mutagenesis (alanine substitutions and R-to-E reversion), electrophoretic mobility shift assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure at atomic resolution combined with mutagenesis and EMSA validation, comprehensive mechanistic study\",\n      \"pmids\": [\"30540931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of the DUX4 second homeodomain (HD2) in apo and DNA-bound forms reveals a clamp-like transactivation mechanism; mutations in the DNA-binding interfaces impaired DUX4 DNA-binding affinity and abrogated DUX4/IGH transactivation activity and inhibitory effects on B-cell differentiation.\",\n      \"method\": \"X-ray crystallography (apo and DNA-bound structures), biophysical binding assays, mutagenesis, B-cell differentiation assay in mouse progenitors\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis plus functional cell-based validation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"29572508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DUX4 functional domains were mapped: homeodomains are required for inhibiting myogenesis and MyoD expression but do not require the C-terminal activation domain; the C-terminal ~80 amino acids (especially the last 20) mediate transcriptional activation and cytotoxicity. Non-toxic homeodomain-containing constructs lacking the C-terminus can act as inhibitors of DUX4-FL by competing for promoter sites.\",\n      \"method\": \"DUX4 deletion/mutation/fusion constructs, DUX4 promoter reporter assay, ZSCAN4 expression, cell viability assay, caspase activation assay, ubiquitination assay\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — systematic domain deletion mutagenesis with multiple functional readouts, single lab\",\n      \"pmids\": [\"29618456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The NuRD (Nucleosome Remodeling Deacetylase) and CAF-1 (Chromatin Assembly Factor 1) complexes are necessary for DUX4 repression in human skeletal muscle cells and iPSCs; DUX4-induced MBD3L proteins partly relieve this repression in FSHD muscle cells, providing a positive feedback mechanism for DUX4 amplification.\",\n      \"method\": \"CRISPR/Cas9-based enChIP locus-specific proteomics of D4Z4, siRNA knockdown of NuRD/CAF-1 components, DUX4 expression assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — enChIP-mass spectrometry for locus-specific protein identification, siRNA functional validation, multiple cell types, single lab with comprehensive approach\",\n      \"pmids\": [\"29533181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DUX4 expression blocks interferon-γ-mediated induction of MHC class I gene expression, enabling immune evasion; re-expression of DUX4 in diverse cancers is associated with reduced cytolytic activity markers and lower MHC class I expression.\",\n      \"method\": \"IFN-γ stimulation assays with DUX4-expressing vs. control cancer cells, RNA-seq, clinical melanoma data correlation\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct experimental suppression of IFN-γ response by DUX4 in cell lines, RNA-seq, single lab\",\n      \"pmids\": [\"31327741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DUX4-induced dsRNA foci are composed primarily of bidirectionally transcribed HSATII (human satellite II) pericentric repeat RNAs; DUX4 initiates bidirectional transcription of normally silenced HSATII repeats, and gapmer-mediated knockdown of HSATII transcripts depletes nuclear ribonucleoprotein aggregates and decreases DUX4-induced cell death.\",\n      \"method\": \"RNA-seq, immunofluorescence for dsRNA foci, gapmer antisense knockdown, co-localization of HSATII RNA with EIF4A3 and ADAR1\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic identification of dsRNA composition (RNA-seq), gapmer rescue establishing causal role of HSATII dsRNA in cell death, co-localization, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"31630170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DUX4-induced histone variants H3.X and H3.Y are incorporated throughout the body of DUX4-induced genes; following a brief DUX4 pulse, these histones contribute to greater perdurance and enhanced re-activation of DUX4 target gene expression, providing a chromatin memory mechanism.\",\n      \"method\": \"Doxycycline-inducible DUX4 myoblasts, CUT&RUN for H3.X/H3.Y, RNA-seq after DUX4 pulse, H3.X/H3.Y knockdown experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CUT&RUN chromatin profiling, pulse-chase DUX4 induction, single lab, direct mechanistic link between histone incorporation and target gene memory\",\n      \"pmids\": [\"31722199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"p38α and p38β MAPK isoforms each independently and requisitely regulate DUX4 expression; pharmacological inhibition of p38α/β suppresses DUX4 mRNA expression and downstream target gene program in FSHD myoblasts and in mouse xenografts, as confirmed by RNA-seq profiling.\",\n      \"method\": \"siRNA knockdown of individual p38 isoforms, multiple selective p38α/β inhibitors, RNA-seq, FSHD1 and FSHD2 patient cells, xenograft model\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific siRNA knockdown establishing causal role, multiple orthogonal pharmacological inhibitors, RNA-seq, two independent patient cell lines, in vivo validation\",\n      \"pmids\": [\"31189728\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DUX4 expression in FSHD muscles leads to compromised NMD which results in translation of truncated proteins from NMD-targeted transcripts; RNA-binding proteins are enriched for aberrant truncations, and the truncated SRSF3 isoform is translated to a stable protein that itself confers toxicity—its downregulation is cytoprotective.\",\n      \"method\": \"Cell-based FSHD model (DUX4 induction), ribosome profiling, mass spectrometry, SRSF3 truncation construct expression, siRNA knockdown of truncated SRSF3, FSHD patient-derived myotube validation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ribosome profiling + MS to detect truncated proteins, gain-of-function and loss-of-function of truncated SRSF3, patient cell validation, multiple orthogonal methods\",\n      \"pmids\": [\"37314931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"p53 activates DUX4/Dux expression via a p53-binding site located in a primate-specific subtelomeric LTR10C element; the p53–DUX4 regulatory axis is conserved between mouse Dux and human DUX4, and this pathway operates in FSHD patient cells during p53 signaling.\",\n      \"method\": \"Long-read sequencing of Dux locus, CHIP-seq for p53 binding, DUX4/Dux induction upon p53 activation, p53 binding site mutation, FSHD patient-derived cell experiments\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — p53 binding site identified and mutated, conserved across species (mouse and human), FSHD patient cell validation, multiple orthogonal methods\",\n      \"pmids\": [\"34267371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"WDR5, a chromatin remodeling protein, is a direct interactor of the lncRNA DBE-T and is required for DUX4 expression and target gene activation in FSHD primary muscle cells; pharmacological WDR5 inhibition rescues cell viability and myogenic differentiation in FSHD patient cells.\",\n      \"method\": \"Affinity purification followed by proteomics, WDR5 siRNA knockdown, WDR5 pharmacological inhibitor, DUX4 and target gene expression assays, myogenic differentiation assay, viability assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomic interaction discovery, functional siRNA validation, pharmacological validation, patient cell rescue experiments, multiple orthogonal methods\",\n      \"pmids\": [\"37021550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DUX4 promotes nuclear translocation of β-CATENIN and increases canonical WNT signalling; constitutive DUX4c expression prevents β-CATENIN nuclear accumulation and the downstream transcriptional program; blockade of WNT/β-CATENIN signalling rescues viability of FSHD myoblasts.\",\n      \"method\": \"DUX4 and DUX4c expression constructs, β-catenin nuclear fractionation/immunofluorescence, WNT pathway inhibitor treatment, cell viability assay, FSHD myoblast rescue\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular localization of β-catenin, pharmacological rescue, antagonism experiments with DUX4c, single lab\",\n      \"pmids\": [\"36158201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DUX4 interacts with the Mediator complex via a C-terminal KIX binding motif; DUX4 expression substantially alters chromatin accessibility (ATAC-seq) and activates thousands of transcribed enhancer-like regions preferentially within ERVL-MaLR repeat elements; CRISPR activation of these enhancer regions via C-terminal DUX4 motifs increases expression of EGA genes ZSCAN4 and KHDC1P1.\",\n      \"method\": \"ATAC-seq, CRISPR activation, DUX4 knockdown in human zygotes (transcriptome analysis), immunofluorescence in zygotes, protein co-IP/interaction for Mediator complex\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ATAC-seq, CRISPR activation, co-IP for Mediator interaction, DUX4 knockdown in zygotes, single lab, multiple methods\",\n      \"pmids\": [\"35402882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DUX4 protein directly interacts with STAT1 via conserved (L)LxxL(L) motifs in its C-terminal region, and this interaction requires STAT1 Y701 phosphorylation; DUX4 broadly suppresses IFN-γ-stimulated gene expression by decreasing STAT1 and Pol-II recruitment at ISG promoters. This mechanism is conserved (mouse Dux also interacts with STAT1), and operates in FSHD muscle cells and CIC-DUX4 sarcoma.\",\n      \"method\": \"Co-IP (DUX4-STAT1 interaction), C-terminal motif mutagenesis, RNA-seq after IFN-γ stimulation ± DUX4, ChIP for STAT1 and Pol-II at ISG promoters, FSHD patient cell validation, sarcoma cell line validation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP, mutagenesis of interaction motifs, ChIP-seq, multiple cell contexts validated, conserved in mouse, multiple orthogonal methods\",\n      \"pmids\": [\"37092726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CIC-DUX4 fusion requires P300/CBP to induce histone H3 acetylation and activate its transcriptional targets; pharmacological P300/CBP inhibition (iP300w) suppresses CIC-DUX4 transcriptional activity, reverses induced H3 acetylation, induces cell cycle arrest in CDS cell lines, and prevents growth of CDS xenograft tumors in vivo.\",\n      \"method\": \"P300/CBP inhibitor treatment, H3 acetylation ChIP, transcriptional reporter assays, xenograft mouse model, cell viability assay\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pharmacological and ChIP-based mechanistic validation, in vivo xenograft, multiple CDS cell lines, demonstrates P300/CBP-dependence of CIC-DUX4 activity\",\n      \"pmids\": [\"34642317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DUX4 controls CXCR4 and CXCL12/SDF1 expression in myoblasts; DUX4 overexpression increases mesenchymal stem cell migration in a Transwell assay, and this effect is blocked by antibodies against SDF1 and CXCR4, placing DUX4 upstream of the CXCR4-SDF1 axis in regulating cell migration.\",\n      \"method\": \"Transcriptome profiling (microarray), Transwell migration assay, antibody blocking, DUX4 overexpression in myoblasts and BMSCs\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional migration assay with antibody blockade, transcriptome profiling, single lab, single method for functional readout\",\n      \"pmids\": [\"27556182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DUX4 homeodomains are necessary and sufficient for inhibition of myogenesis and induction of cytotoxicity; substitution mutants in which both DUX4 homeodomains are replaced by Pax7 homeodomains retain the ability to inhibit differentiation and induce cytotoxicity. Among related homeodomain proteins, only Pax3 and Pax7 (not Pax6, Pitx2c, OTX1, Rax, Hesx1, MIXL1, Tbx1) display phenotypic competition with DUX4, requiring the paired and transcriptional activation domains of Pax3 in addition to its homeodomain.\",\n      \"method\": \"Expression of homeodomain swap and deletion constructs, C2C12 differentiation assays, cytotoxicity assay, domain analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic domain swap mutagenesis, multiple construct comparisons, functional phenotypic readouts, single lab\",\n      \"pmids\": [\"28935672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DUX4-induced toxicity in C2C12 myoblasts and in the inducible mouse model is not p53-dependent: p53 inhibition has no effect on DUX4 cytotoxicity; DUX4 does not activate the canonical p53 pathway; p21/Cdkn1a induction by DUX4 is mouse-specific and p53-independent. The DUX4 inducible mouse crossed onto p53-null background shows no suppression of male-specific lethality or skin phenotypes.\",\n      \"method\": \"C2C12 cytotoxicity assay with p53 inhibitor, meta-analysis of 5 DUX4 transcriptional datasets, p53-null mouse cross with inducible DUX4 transgene, primary myoblast killing assay\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — negative result well-supported by multiple models (in vitro + in vivo p53-null genetic epistasis), meta-analysis, single lab; directly contradicts earlier p53-dependence claim\",\n      \"pmids\": [\"28754837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NFE2L3 functions as a regulator that links NF-κB/RELA signaling to CDK1 activity via DUX4; NFE2L3 knockdown results in increased DUX4 levels, and DUX4 functions as a direct inhibitor of CDK1, thereby controlling cell cycle progression in colon cancer cells.\",\n      \"method\": \"NFE2L3 siRNA knockdown, DUX4 expression measurement, CDK1 activity assays, cell proliferation assay in vitro, tumor growth in vivo\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function knockdown with specific molecular target (CDK1), in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"31693889\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DUX4 is a double-homeodomain transcription factor that normally drives zygotic genome activation in cleavage-stage embryos by binding TAAT-containing motifs (head-to-head homeodomain configuration defined by crystal structure) to activate germline genes and ERVL/MaLR retrotransposons via recruitment of p300/CBP histone acetyltransferases and the Mediator complex through its C-terminal domain; in FSHD skeletal muscle, pathological mis-expression triggers a cascade that includes NMD inhibition via UPF1 degradation, bidirectional HSATII satellite repeat transcription producing cytotoxic dsRNA, TDP-43 aggregation, induction of muscle atrophy ubiquitin ligases (MuRF1/Atrogin1) via the ubiquitin-proteasome pathway, p53-independent G1 arrest via Sp1-mediated p21 upregulation, β-catenin nuclear translocation activating WNT signaling, and STAT1 sequestration that broadly suppresses IFN-γ-stimulated gene expression; DUX4 expression is controlled epigenetically through SMCHD1/NuRD/CAF-1/PRC2-mediated chromatin repression at D4Z4, is activated by p53 via an LTR10C-embedded p53-binding site and by p38α/β MAPK signaling, and is amplified by a positive feedback loop in which DUX4-induced MBD3L proteins disrupt NuRD-mediated D4Z4 silencing and NMD inhibition stabilizes DUX4 mRNA.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DUX4 is a double-homeodomain transcription factor that functions as a pioneer factor to drive a cleavage-stage/early embryonic gene expression program, activating germline and 2C-like genes (ZSCAN4, KDM4E, PRAMEF family) and ERVL/MaLR-class endogenous retrotransposons, with mouse Dux being necessary and sufficient to convert mESCs to a 2C-like state [#16, #4]. Its tandem homeodomains bind DNA in a head-to-head configuration recognizing two TAAT cores separated by a spacer; a primate-specific arginine-to-glutamate substitution in the recognition helix of the second homeodomain causes the two domains to read divergent sequences, explaining species-specific retrotransposon target divergence [#20, #12, #17]. Transcriptional activation and cytotoxicity are separable from DNA binding and map to a C-terminal activation domain that recruits p300/CBP histone acetyltransferases and the Mediator complex (via a KIX-binding motif), driving H3K27 acetylation and chromatin opening at target loci, while the homeodomains alone suffice to inhibit MyoD-dependent myogenesis [#11, #32, #22, #2]. Pathological mis-expression of DUX4 is intrinsically cytotoxic, inducing caspase-dependent apoptosis, oxidative stress sensitization, and a cascade of downstream insults: degradation of the NMD factor UPF1 (with DUX4 mRNA itself an NMD substrate, forming a stabilizing feedback loop and generating toxic truncated proteins such as SRSF3) [#9, #28], bidirectional transcription of HSATII pericentric satellite repeats producing cytotoxic nuclear dsRNA foci [#25, #18], TDP-43 aggregation linked to ubiquitin-proteasome dysfunction [#10, #6], and induction of muscle atrophy E3 ligases MuRF1/Atrogin1 [#5]. DUX4 also suppresses immunity by directly binding phospho-STAT1 to block IFN-\\u03b3-stimulated gene and MHC class I induction [#33, #24]. DUX4 expression is normally restrained by NuRD/CAF-1-mediated chromatin repression at D4Z4, relieved by DUX4-induced MBD3L proteins in a feed-forward loop, and is positively driven by p38\\u03b1/\\u03b2 MAPK signaling, a p53-binding LTR10C element, WDR5, and muscle-specific enhancers [#23, #27, #29, #30, #8]. As an oncogenic driver, DUX4 chromosomal rearrangements and fusions (DUX4-IGH, CIC-DUX4, ERG rearrangement) transform cells through neomorphic transcriptional activation of targets including ETV4, CCNE1, and ERGalt [#14, #19, #15, #34].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established DUX4 as a sequence-specific transcriptional activator, defining its molecular identity as a TAAT-binding factor.\",\n      \"evidence\": \"EMSA, site-directed mutagenesis, and luciferase reporter in C2C12 cells on a Pitx1 promoter element\",\n      \"pmids\": [\"17984056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PITX1 is a genuine direct target was later challenged\", \"Genome-wide binding not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed DUX4 is intrinsically cytotoxic and anti-myogenic, repressing MyoD and the glutathione redox pathway, with Pax3/Pax7 antagonism implicating homeodomain competition.\",\n      \"evidence\": \"Isogenic titratable myoblast expression system with expression profiling and Pax3/Pax7 rescue\",\n      \"pmids\": [\"18833193\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect target distinction not resolved\", \"Mechanism of Pax competition not defined at the chromatin level\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated that myopathic activity requires DNA binding, linking the transcription-factor function directly to in vivo pathology.\",\n      \"evidence\": \"DNA-binding mutant plus p53-null cross in zebrafish and mouse muscle models\",\n      \"pmids\": [\"21446026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"p53-dependence was later contradicted by other models\", \"Identity of direct toxic target genes not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected DUX4 to retrotransposon biology and innate immune modulation, broadening its role beyond single protein-coding targets.\",\n      \"evidence\": \"ChIP-seq, expression profiling, and reporter assays in muscle cells, including DEFB103 activation; plus atrophy ligase induction and ASO knockdown\",\n      \"pmids\": [\"22209328\", \"22053214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How retrotransposon activation contributes to toxicity not yet causal\", \"Mechanism of immune suppression unresolved at this stage\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Characterized the rarity and intercellular spread of DUX4 protein and its ubiquitin-proteasome-regulated stability, informing the burst-like nature of expression.\",\n      \"evidence\": \"Quantitative immunodetection, nuclear scoring, and proteasome inhibitor stability assays in FSHD cells\",\n      \"pmids\": [\"23206257\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of nuclear diffusion unproven\", \"E3 ligase mediating DUX4 turnover not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined tissue-specific transcriptional control via muscle enhancers and a p53-independent G1 arrest mechanism through Sp1-driven p21.\",\n      \"evidence\": \"3C chromatin looping and ChIP for DME1/DME2 enhancers; flow cytometry, p21 reporter, Sp1 site mutation and ChIP\",\n      \"pmids\": [\"24636994\", \"24589735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"p21/Sp1 mechanism later shown to be mouse-specific\", \"Enhancer activation triggers not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Uncovered NMD inhibition via UPF1 degradation as a core toxicity and feedback mechanism, and linked DUX4 to TDP-43 aggregation and proteostasis collapse.\",\n      \"evidence\": \"DUX4-inducible cell systems with RNA-seq, NMD reporters, UPF1 quantification, fractionation, and proteasome inhibition\",\n      \"pmids\": [\"25564732\", \"25750920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which DUX4 triggers UPF1 degradation unresolved\", \"Direct vs indirect cause of TDP-43 aggregation unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mapped the molecular basis of DUX4 transcriptional activation to C-terminal recruitment of p300/CBP and its pioneer-factor behavior at MaLR chromatin, and refined its DNA-binding code.\",\n      \"evidence\": \"Mass-spec co-IP, ChIP-seq, C-terminal deletion/dominant-negative constructs; SELEX-like binding with systematic mutagenesis\",\n      \"pmids\": [\"26951377\", \"26823969\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of p300/CBP recruitment not defined\", \"Pioneer-factor nucleosome engagement mechanism not structurally resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established the DUX4 double homeodomain as an oncogenic driver through chromosomal rearrangements producing neomorphic transcription.\",\n      \"evidence\": \"DUX4-IGH pro-B transplantation leukemia model and DUX4-driven ERGalt dominant-negative transformation assays\",\n      \"pmids\": [\"27019113\", \"27776115\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full target repertoire of fusion oncoproteins incomplete\", \"Relationship between FSHD and oncogenic programs not directly compared\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified cytoplasmic and cytoskeletal/RNA-binding-protein interactions, suggesting non-nuclear roles or sequestration of DUX4/DUX4c.\",\n      \"evidence\": \"Y2H, HaloTag co-purification, GST pulldown, co-IP, and PLA identifying desmin, LMCD1, FUS, SFPQ, and others\",\n      \"pmids\": [\"26816005\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of cytoplasmic interactions undefined\", \"Some interactions lack reciprocal in vivo validation\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined DUX4 as the master activator of zygotic/2C-like genome activation, conserved with mouse Dux but with species-divergent retrotransposon targeting.\",\n      \"evidence\": \"ATAC-seq, RNA-seq, ChIP-seq, and necessary-and-sufficient Dux KO/OE in mESCs plus cross-species expression\",\n      \"pmids\": [\"28459457\", \"28459454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo requirement during human embryogenesis not directly tested here\", \"Basis for promoter vs retrotransposon target divergence not yet structural\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked DUX4 toxicity to MYC induction and dsRNA innate immune activation, and dissected which domains drive cytotoxicity versus differentiation block.\",\n      \"evidence\": \"siRNA screen with RNA-seq and dsRNA/EIF4A3 imaging; homeodomain-swap and deletion constructs in C2C12\",\n      \"pmids\": [\"28273136\", \"28935672\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Source of dsRNA not yet identified at this stage\", \"Relative contribution of each toxic pathway to cell death not quantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved the structural basis of tandem-homeodomain DNA recognition, explaining a primate-specific mutation driving divergent half-site specificity and a clamp-like activation mechanism.\",\n      \"evidence\": \"X-ray crystallography of the tandem and HD2 domains with mutagenesis, EMSA, and B-cell differentiation assays\",\n      \"pmids\": [\"30540931\", \"29572508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length DUX4 with cofactors not solved\", \"How DNA binding couples to p300/Mediator recruitment not structurally shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified NuRD/CAF-1 chromatin complexes as the repressive machinery silencing D4Z4 and a MBD3L-driven feed-forward loop relieving that repression.\",\n      \"evidence\": \"CRISPR/Cas9 enChIP locus-specific proteomics of D4Z4 with siRNA functional validation\",\n      \"pmids\": [\"29533181\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger that initiates the first de-repression event unclear\", \"Quantitative contribution of MBD3L feedback in vivo not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Reconciled the toxicity pathway by identifying bidirectionally transcribed HSATII satellite RNA as the causal dsRNA species driving cell death.\",\n      \"evidence\": \"RNA-seq, dsRNA imaging, and gapmer knockdown rescuing DUX4-induced death\",\n      \"pmids\": [\"31630170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How DUX4 initiates HSATII bidirectional transcription not mechanistically defined\", \"Sensor mediating dsRNA toxicity not pinpointed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed a histone-variant-based chromatin memory mechanism (H3.X/H3.Y) enabling target gene re-activation after transient DUX4 pulses.\",\n      \"evidence\": \"Doxycycline-inducible DUX4 myoblasts with CUT&RUN and pulse-chase RNA-seq plus knockdown\",\n      \"pmids\": [\"31722199\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Deposition machinery for H3.X/H3.Y not identified\", \"Persistence duration in patient cells unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established upstream signaling control of DUX4 by p38\\u03b1/\\u03b2 MAPK and downstream immune-evasion and metastatic programs across FSHD and cancer.\",\n      \"evidence\": \"Isoform-specific p38 siRNA and inhibitors with RNA-seq and xenografts; IFN-\\u03b3/MHC-I suppression assays; CIC-DUX4 ETV4/CCNE1 targeting; CXCR4-SDF1 migration assay\",\n      \"pmids\": [\"31189728\", \"31327741\", \"31329165\", \"27556182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How p38 signaling intersects D4Z4 chromatin not detailed\", \"Direct vs indirect immune-target relationships incompletely mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Challenged the earlier p53-dependence of DUX4 toxicity and demonstrated translation of toxic truncated proteins from NMD-compromised transcripts.\",\n      \"evidence\": \"p53-null mouse cross and inhibitor assays with transcriptomic meta-analysis; ribosome profiling, MS, and SRSF3-truncation gain/loss-of-function\",\n      \"pmids\": [\"28754837\", \"37314931\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation of conflicting p53 results across models incomplete\", \"Full set of toxic truncated proteins not catalogued\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined a conserved p53-LTR10C activation axis and additional regulators (WDR5, WNT/\\u03b2-catenin) controlling DUX4 expression and toxicity.\",\n      \"evidence\": \"p53 ChIP-seq and binding-site mutation across species; WDR5 proteomics/inhibitor rescue; \\u03b2-catenin fractionation and WNT inhibitor rescue; CIC-DUX4 p300/CBP dependence\",\n      \"pmids\": [\"34267371\", \"37021550\", \"36158201\", \"34642317\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of multiple upstream activators into a single regulatory logic unclear\", \"Tissue specificity of these axes in vivo incompletely tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected DUX4 to the Mediator complex and genome-wide enhancer activation within ERVL-MaLR elements during embryonic genome activation.\",\n      \"evidence\": \"ATAC-seq, CRISPR activation of enhancer regions, Mediator co-IP, and DUX4 knockdown in human zygotes\",\n      \"pmids\": [\"35402882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"KIX-Mediator interaction interface not structurally resolved\", \"Causal contribution of each enhancer to embryonic development untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined the direct molecular mechanism of DUX4-mediated immune evasion through phospho-STAT1 binding and blockade of ISG transcription.\",\n      \"evidence\": \"Co-IP with C-terminal motif mutagenesis, IFN-\\u03b3 RNA-seq, STAT1/Pol-II ChIP, across FSHD and CIC-DUX4 sarcoma cells, conserved in mouse\",\n      \"pmids\": [\"37092726\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of the DUX4-STAT1 complex unknown\", \"Therapeutic exploitation in tumors untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple upstream activators (p53, p38 MAPK, WDR5, NuRD/CAF-1 derepression) integrate to produce the rare, stochastic bursts of DUX4 in FSHD muscle, and which single intervention point most effectively halts the downstream toxic cascade, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking chromatin state, signaling, and burst kinetics\", \"Relative therapeutic priority among UPF1/NMD, HSATII dsRNA, p38, and WNT axes undetermined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 4, 11, 16, 22, 32]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 3, 12, 20, 21]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [33, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 11, 16, 32]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [9, 28]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [24, 33, 18]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [7, 19, 38]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [11, 23, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 15, 19]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 18, 25]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"EP300\", \"CREBBP\", \"STAT1\", \"UPF1\", \"WDR5\", \"DES\", \"FUS\", \"SFPQ\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}