{"gene":"MYOD1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1988,"finding":"MyoD1 is a nuclear phosphoprotein; a basic region (residues 102–135) is required for nuclear localization, and a Myc-homology domain (residues 143–162) is required for induction of myogenesis but not nuclear localization. As few as 68 amino acids encompassing these two domains are sufficient to activate myogenesis in stably transfected 10T1/2 cells.","method":"Site-directed deletional mutagenesis of MyoD1 cDNA; stable transfection of fibroblasts; polyclonal antisera localization","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro mutagenesis combined with cell-based functional readout, foundational study replicated by multiple subsequent labs","pmids":["3175662"],"is_preprint":false},{"year":1991,"finding":"MyoD transcriptional activation maps to an N-terminal activation domain (within the first 53 residues), which is normally masked. A specific alanine in the basic region increases DNA binding and a specific threonine is required for transcriptional activation. The basic region requires a cell-type-specific 'recognition factor' to function. Replacement of the MyoD basic region with that of E12 abolishes transactivation but not DNA binding in most cell types.","method":"Chimeric protein mutagenesis; reporter gene cotransfection; in vivo DNA binding assays; VP16 domain-swap rescue","journal":"Genes & Development","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal mutagenesis and functional rescue experiments in one rigorous study","pmids":["1651276"],"is_preprint":false},{"year":1989,"finding":"MyoD1 activates its own transcription (positive autoregulation) in 10T1/2 and Swiss 3T6 cells. MyoD1 and myogenin engage in a mutual positive autoregulatory loop, each activating the other's expression.","method":"Transfection of MyoD1/myogenin cDNA expression vectors into fibroblast lines; measurement of endogenous mRNA induction","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean gain-of-function transfection with defined mRNA readout, widely replicated","pmids":["2546677"],"is_preprint":false},{"year":1990,"finding":"Two adjacent MyoD1-binding sites (E-boxes) in the muscle-specific enhancer of the chicken acetylcholine receptor α-subunit gene are essential for full enhancer activity in transfected myotubes, demonstrating MyoD1 directly transactivates AChR gene expression.","method":"Site-directed mutagenesis of E-box elements; transient transfection reporter assays in myotubes","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of cognate binding sites with functional readout, landmark mechanistic paper","pmids":["2342565"],"is_preprint":false},{"year":1990,"finding":"MyoD1 inhibits cell proliferation independently of myogenic differentiation. Deletion of the Myc-like domain eliminates inhibition of DNA synthesis, while substitution of the basic domain with E12's basic domain inhibits growth but fails to induce differentiation, indicating growth inhibition and differentiation are separable functions.","method":"Microinjection of MyoD1 constructs into NIH 3T3 cells; deletion and domain-swap mutagenesis; DNA synthesis assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro functional dissection with domain-swap mutagenesis, single lab, multiple orthogonal approaches","pmids":["2359457"],"is_preprint":false},{"year":1991,"finding":"The HLH motif of MyoD mediates dimerization, and dimerization partner determines MyoD activity. The four human muscle bHLH proteins (Myf3/MyoD, Myf4, Myf5, Myf6) form stable heterodimers with ubiquitous E proteins (E12, E2-2, E2-5) and bind CANNTG E-box sequences with similar efficiency; homodimers among Myf proteins do not bind DNA.","method":"In vitro dimerization assays; electrophoretic mobility shift assays (EMSA) with purified proteins","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro binding and dimerization assays, multiple proteins tested orthogonally","pmids":["1945842"],"is_preprint":false},{"year":1995,"finding":"MyoD induces p21 expression at the mRNA and protein levels during terminal muscle differentiation. p21 forms a complex with cyclin-dependent kinases in myotubes and is sufficient for cell cycle arrest. MyoD-transformed 10T1/2 fibroblasts (but not parental cells) upregulate p21 upon serum withdrawal, linking p21 induction to myogenic commitment.","method":"C2C12 differentiation; immunodepletion of p21 from myotube extracts; ectopic p21 expression; MyoD-transformed 10T1/2 cells; Northern and Western blotting","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays, loss-of-function (immunodepletion) and gain-of-function, widely replicated","pmids":["7791789"],"is_preprint":false},{"year":1995,"finding":"MSX1 directly binds the MyoD enhancer and represses MyoD transcription. Human chromosome 4 (containing MSX1) inhibits myoD activation in fibroblast × 10T1/2 hybrids; forced MSX1 expression represses myoD enhancer activity; antisense MSX1 relieves repression.","method":"Somatic cell hybrid analysis; enhancer/promoter reporter assays; EMSA showing Msx1 binding to MyoD enhancer; antisense suppression","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct DNA binding demonstrated by EMSA, functional rescue with antisense, multiple orthogonal approaches in one study","pmids":["7664340"],"is_preprint":false},{"year":1998,"finding":"In the absence of DNA, MyoD bHLH domain is unfolded and monomeric, whereas E47 forms a stable homodimer. MyoD does not dimerize with E47 under dilute conditions without DNA. In the presence of specific DNA, MyoD–E47 form almost exclusively heterodimeric complexes, driven by favorable DNA contacts rather than protein–protein interactions. Substituting the E47 loop into MyoD allows DNA-free dimerization.","method":"Fluorescence quenching; equilibrium binding assays; EMSA; loop-swap mutagenesis of bHLH domains","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and multiple biophysical methods","pmids":["9488706"],"is_preprint":false},{"year":2000,"finding":"MyoD is acetylated by both CBP/p300 and PCAF on two lysines at the boundary of the DNA-binding domain. Acetylation by CBP/p300 increases MyoD activity on muscle-specific promoters. MyoD mutants that cannot be acetylated in vitro are not activated in functional microinjection assays. MyoD is constitutively acetylated in muscle cells.","method":"In vitro acetylation assays; microinjection functional assays; site-directed mutagenesis of acetylation sites; Western blotting","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay plus mutagenesis plus cell-based functional readout","pmids":["10944526"],"is_preprint":false},{"year":2001,"finding":"Acetylated MyoD interacts with the bromodomain of CBP/p300. In muscle cells, endogenous acetylated MyoD associates with CBP/p300. In vitro, acetylation increases the affinity and salt resistance of the MyoD–CBP interaction. MyoD mutants unable to be acetylated fail to associate with CBP/p300 in vivo and are strongly impaired in transcriptional cooperation with CBP.","method":"Co-immunoprecipitation of endogenous proteins; in vitro pull-down with acetylated/unacetylated MyoD; CBP bromodomain mutant analysis; reporter gene assays","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP of endogenous proteins plus in vitro pull-down, mutagenesis, functional assay","pmids":["11463815"],"is_preprint":false},{"year":2000,"finding":"p57(Kip2) directly binds MyoD via the NH2-terminal alpha-helix domain of p57 interacting with the bHLH domain of MyoD (basic region), stabilizing MyoD by increasing its half-life. This physical interaction was shown for both overexpressed and endogenous proteins. p57 increases MyoD transcriptional activity on muscle-specific genes through a mechanism distinct from CDK inhibition.","method":"Co-immunoprecipitation of endogenous proteins in C2C12 cells; site-directed mutagenesis; competition/association assays; half-life measurements","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — endogenous Co-IP, mutagenesis, and functional assays in one study","pmids":["10764802"],"is_preprint":false},{"year":2002,"finding":"MyoD is ubiquitinated preferentially at its N-terminus (N-terminus-dependent pathway) and degraded by the proteasome in the nucleus. The nuclear localization signal and nuclear export signal restrict ubiquitination and degradation to nuclear or cytoplasmic compartments. In the cytoplasm, lysine-dependent ubiquitination is more active; in the nucleus both pathways are active.","method":"Mutagenesis of NLS/NES; N-terminal 6×Myc tag blocking; pulse-chase half-life assays; compartment-restricted degradation assays","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic mutagenesis with compartment-specific functional readouts in one rigorous study","pmids":["12397066"],"is_preprint":false},{"year":2002,"finding":"Cdk9/cyclin T2a forms a multimeric complex with MyoD in C2C12 cells, with the minimal cdk9-binding region mapping within residues 101–161 (bHLH region) of MyoD. Cdk9 phosphorylates MyoD in vitro. Overexpression of cdk9/cyclinT2a enhances MyoD-dependent transcription and myogenic differentiation; dominant-negative cdk9 represses it.","method":"Co-immunoprecipitation; in vitro kinase assay; overexpression and dominant-negative expression in C2C12 and MyoD-converted fibroblasts","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP complex, in vitro phosphorylation, and functional gain/loss-of-function in single lab","pmids":["12037670"],"is_preprint":false},{"year":2004,"finding":"MyoD is phosphorylated on Ser5 and Ser200 by cyclin B–Cdc2 during G2/M, destabilizing MyoD and downregulating p21. A non-phosphorylatable MyoD A5/A200 mutant sustains p21 expression, inhibits cyclin B–Cdc2 kinase activity, delays M-phase entry, and requires p21 for this G2 arrest (not observed in p21−/− cells). MyoD interaction with P/CAF coactivator is enhanced when Cdc2 phosphorylation is absent.","method":"Inducible expression of phospho-site mutants; cyclin B–Cdc2 kinase assays; luciferase reporter assays; p21−/− cell epistasis","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay, mutagenesis, genetic epistasis with p21 KO cells, multiple orthogonal methods","pmids":["14749395"],"is_preprint":false},{"year":2005,"finding":"MyoD NH2- and COOH-terminal regions cooperate to activate differentiation-phase target genes. MyoD is strikingly more effective than Myf5 at inducing terminal differentiation genes, a distinction arising from this novel inter-domain cooperation not present in Myf5.","method":"Microarray and PCR gene expression profiling; domain-deletion/chimeric constructs; in vitro myogenic conversion assays","journal":"The Journal of Cell Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with functional readout, single lab, microarray plus PCR validation","pmids":["16275751"],"is_preprint":false},{"year":2006,"finding":"MyoD directly activates transcription of the muscle-specific microRNA miR-206, which in turn targets the 3′-UTR sequences of Fstl1 and Utrn mRNAs to suppress their expression during skeletal muscle differentiation.","method":"ChIP demonstrating MyoD binding to miR-206 locus; 3′-UTR reporter assays; MyoD gain-of-function in fibroblasts","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP plus 3′-UTR reporter assays plus gain-of-function, multiple orthogonal methods","pmids":["17030984"],"is_preprint":false},{"year":2007,"finding":"Pbx homeodomain proteins are required for MyoD to induce a subset of muscle genes including myogenin and fast-muscle genes in zebrafish somites. In the absence of Pbx function, Myod cannot induce fast-muscle but can still drive slow-muscle gene expression, demonstrating Pbx modulates MyoD target-gene specificity toward fast-fiber identity.","method":"Pbx loss-of-function (morpholino knockdown) in zebrafish embryos; combinatorial Pbx/Myod/Myf5 knockdown epistasis; in situ hybridization","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple combinatorial knockdowns, clear cellular phenotype, ortholog study in vertebrate model","pmids":["17699609"],"is_preprint":false},{"year":2007,"finding":"FHL3 directly binds MyoD (demonstrated by GST pull-down and co-localization in the nucleus of myoblasts) and acts as a potent negative co-transcriptional regulator: overexpression of FHL3 impairs MyoD-mediated transcriptional activity and delays myotube formation, while siRNA-mediated FHL3 knockdown enhances both.","method":"GST pull-down; Co-IP; nuclear co-localization; reporter gene assays; siRNA knockdown in C2C12 cells","journal":"Journal of Cell Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus Co-IP plus functional knockdown/overexpression, single lab","pmids":["17389685"],"is_preprint":false},{"year":2008,"finding":"FoxO3 and Pax3/7 act as codependent transcriptional activators of MyoD in myoblasts, requiring each other to cooperatively recruit RNA polymerase II and form a preinitiation complex at the MyoD promoter. FoxO3-null mice show impaired muscle regeneration with reduced MyoD expression.","method":"Cell-based reporter assays; in vitro pull-down; ChIP; FoxO3 knockout mouse muscle regeneration assays","journal":"Developmental Cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP, in vitro interaction assay, and in vivo genetic loss-of-function with defined phenotype","pmids":["18854138"],"is_preprint":false},{"year":2008,"finding":"HP1α and HP1β (but not HP1γ) directly interact with MyoD in myoblasts, as shown with recombinant proteins in vitro and Co-IP. HP1α and HP1β inhibit MyoD transcriptional activity in a reporter assay. ChIP shows preferential recruitment of HP1 to MyoD target gene promoters in proliferating myoblasts, and modulation of HP1 levels alters MyoD target gene expression.","method":"In vitro binding with recombinant proteins; Co-immunoprecipitation; reporter gene assay; ChIP","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro direct binding plus Co-IP plus ChIP plus functional reporter assay, single lab","pmids":["18599480"],"is_preprint":false},{"year":2008,"finding":"Calcineurin/NFATc2/c3 signaling cooperates synergistically with MyoD at the myogenin promoter. Two conserved NFAT binding sites in the myogenin promoter are occupied by NFATc3 upon differentiation, and combinatorial loss of myod and nfatc3 (but not either alone) severely impairs myogenin expression in vivo.","method":"Gel shift (EMSA) and ChIP for NFATc3 binding; genetic epistasis (double-null embryos); luciferase reporter assays","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP, EMSA, double KO genetic epistasis with in vivo readout, multiple orthogonal methods","pmids":["18676376"],"is_preprint":false},{"year":2010,"finding":"CLOCK and BMAL1 directly bind the MyoD core enhancer in a rhythmic (circadian) manner and are required for normal MyoD mRNA and protein cycling. Clock and Bmal1 mutant mice show disrupted myofilament architecture and reduced maximal force, phenocopying aspects of MyoD-null muscle.","method":"ChIP demonstrating CLOCK/BMAL1 binding to MyoD promoter; Clock(Δ19) and Bmal1−/− mouse models; electron microscopy; force measurements; MyoD−/− comparison","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP with multiple genetic models, electron microscopy and physiological phenotyping, multiple orthogonal approaches","pmids":["20956306"],"is_preprint":false},{"year":2010,"finding":"MyoD drives apoptosis of myoblasts through transcriptional activation of miR-1 and miR-206, which target the Pax3 3′-UTR (two conserved miR-1/miR-206 binding sites required) to down-regulate Pax3 and suppress antiapoptotic Bcl-2 and Bcl-xL. MyoD knockdown increases cell survival of wild-type myoblasts.","method":"MyoD−/− myoblasts; forced MyoD expression; miRNA gain/loss-of-function; 3′-UTR reporter assays with site mutations; siRNA knockdown of MyoD","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain/loss-of-function, 3′-UTR reporter mutagenesis, multiple orthogonal approaches","pmids":["20956382"],"is_preprint":false},{"year":2012,"finding":"MyoD1 is required for condition-specific muscle enhancer assembly genome-wide. MyoD1-null myoblasts show loss of transcription factor recruitment and reduction of H3K4me1 and H3K27ac at enhancers. Re-expression of MyoD1 in null myoblasts restores H3K4me1 but not H3K27ac; re-expression in null myotubes restores both. MyoD1 recruits Set7 (H3K4 monomethylase) to enhancers.","method":"ChIP-seq for histone modifications and TF binding; MyoD1-null myoblasts and myotubes; MyoD1 re-expression; genome-wide chromatin state mapping","journal":"Genes & Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq with KO and rescue, multiple histone marks, rigorous controls","pmids":["23249738"],"is_preprint":false},{"year":2012,"finding":"MASTR activates a muscle-specific postnatal MyoD enhancer through associations with MEF2 and Myocardin family members, thereby regulating MyoD expression in satellite cells. MASTR deletion impairs skeletal muscle regeneration due to satellite cell differentiation defects, mimicking MyoD deficiency.","method":"Satellite cell-specific and global MASTR knockout mice; reporter assays with MyoD enhancer; Co-IP between MASTR and MEF2/myocardin family members","journal":"Genes & Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined phenotype plus enhancer reporter and protein interaction assays, single lab","pmids":["22279050"],"is_preprint":false},{"year":2012,"finding":"HUWE1 ubiquitinates MyoD at its N-terminal residue and targets it for proteasomal degradation.","method":"In vitro ubiquitination assay; co-expression studies; mapping of ubiquitination site to N-terminus","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination assay with site mapping, single lab","pmids":["22277673"],"is_preprint":false},{"year":2015,"finding":"KAP1/TRIM28 is present with MyoD and Mef2 at muscle gene promoters in myoblasts, scaffolding both coactivators (p300, LSD1) and corepressors (G9a, HDAC1), resulting in net silencing. Upon differentiation, MSK1-mediated phosphorylation of KAP1 releases corepressors, enabling MyoD/Mef2 transcriptional activation.","method":"ChIP-seq; Co-IP of KAP1/MyoD/Mef2 complex; phospho-KAP1 analysis; MSK1 kinase and dominant-negative studies; reporter assays","journal":"Genes & Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq, complex Co-IP, kinase epistasis, multiple methods in one study","pmids":["25737281"],"is_preprint":false},{"year":2015,"finding":"MyoD DNA-binding specificity at 'private' E-box sites (CAGGTG) cooperates with PBX/MEIS co-factor binding motifs to determine myogenic lineage specification. Point mutations preventing MyoD interaction with PBX/MEIS convert a MyoD–NeuroD2 chimera from a mixed muscle/neuronal factor to a pure neurogenic factor, showing PBX/MEIS-assisted private-site binding is required for full myogenic identity.","method":"ChIP-seq; chimeric factor design with swapped DNA-binding domains; genome-wide binding analysis; point mutagenesis to disrupt PBX/MEIS interaction","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — genome-wide binding analysis plus mutagenesis with functional lineage-conversion readout","pmids":["25801030"],"is_preprint":false},{"year":2015,"finding":"G9a methylates MyoD, promoting its ubiquitination-dependent degradation via the Cul4/Ddb1/Dcaf1 pathway. Jmjd2C demethylase directly associates with MyoD in vitro and in vivo, demethylates it, and stabilizes it, thereby increasing MyoD transcriptional activity and myogenic differentiation.","method":"Co-IP; in vitro demethylation and methylation assays; half-life measurement; Jmjd2C overexpression/knockdown; ChIP for H3K9me3","journal":"Biochimica et Biophysica Acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro enzymatic assays plus Co-IP plus functional knockdown/OE, single lab","pmids":["26149774"],"is_preprint":false},{"year":2017,"finding":"LSD1/KDM1a is recruited to the MyoD core enhancer upon muscle differentiation, removes H3K9 methylation, and enables RNA polymerase II recruitment to the core enhancer for transcription of a non-coding enhancer RNA (CEeRNA) required for MyoD expression. Lsd1 conditional inactivation delays MyoD expression in limb buds during embryogenesis.","method":"ChIP; siRNA knockdown in myoblasts; conditional Lsd1 KO in muscle progenitors during embryogenesis; measurement of CEeRNA","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus conditional KO plus non-coding RNA functional readout, multiple orthogonal methods","pmids":["28228264"],"is_preprint":false},{"year":2017,"finding":"Staufen1 binds MyoD mRNA 3′-UTR in quiescent muscle stem cells and actively represses MyoD translation, maintaining quiescence despite high MyoD transcript levels. Staufen1+/− heterozygous muscle stem cells have increased MyoD protein, exit quiescence, and proliferate; blocking MyoD translation maintains quiescence.","method":"RNA pulldown; single-molecule FISH; single-cell co-staining; Staufen1+/− mouse model; translational repression rescue experiments","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNA pulldown, genetic model, and single-molecule analysis; multiple orthogonal approaches","pmids":["29073096"],"is_preprint":false},{"year":2017,"finding":"Linc-RAM directly binds MyoD and promotes assembly of the MyoD–Baf60c–Brg1 chromatin remodeling complex on regulatory elements of myogenic target genes. Linc-RAM knockout mice display impaired muscle regeneration and satellite cell differentiation defects.","method":"RNA pull-down and Co-IP for Linc-RAM/MyoD interaction; Linc-RAM KO mice; ChIP for complex assembly at target gene regulatory elements","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct RNA–protein interaction assay, KO mouse model with in vivo phenotype, ChIP for complex assembly","pmids":["28091529"],"is_preprint":false},{"year":2019,"finding":"MyoD activates enhancer RNA (seRNA-1) production at a super-enhancer. seRNA-1 binds hnRNPL via a CAAA tract and regulates RNA Pol II and H3K36me3 deposition at the myoglobin (Mb) locus, activating Mb transcription. Disruption of the seRNA-1/hnRNPL interaction attenuates this activation.","method":"ChIP-seq; RNA-seq; CLIP for seRNA-1/hnRNPL interaction; CAAA-tract mutagenesis; Pol II and H3K36me3 ChIP","journal":"Nature Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq plus RNA-protein interaction assay plus mutagenesis, single lab","pmids":["31857580"],"is_preprint":false},{"year":2019,"finding":"2-Hydroxyglutarate (2HG) produced by oncogenic IDH2 blocks MyoD-driven myogenic differentiation through H3K9 hypermethylation and impaired chromatin accessibility at myogenic loci, while DNA 5mC hypermethylation is dispensable for this differentiation block.","method":"MyoD-driven fibroblast differentiation model; IDH2-R172K expression; ATAC-seq; H3K9 methylation ChIP; 5mC profiling","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistically defined differentiation block via specific histone modification pathway, single lab, ATAC-seq and ChIP","pmids":["31182575"],"is_preprint":false},{"year":2020,"finding":"MyoD is the key molecular switch required and sufficient to initiate Myomixer and Myomaker expression for human myoblast fusion, binding E-box motifs on their promoters. CRISPR mutagenesis of MyoD abrogates fusion; forced MyoD expression in non-muscle cells induces Myomixer and Myomaker.","method":"CRISPR mutagenesis of MyoD; luciferase reporter assays with E-box mutants; forced MyoD expression; biochemical assays","journal":"Science Advances","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with defined fusion phenotype, E-box mutagenesis in reporter assays, multiple orthogonal methods","pmids":["33355126"],"is_preprint":false},{"year":2021,"finding":"Myod1 collaborates with the glucocorticoid receptor (GR) at skeletal muscle enhancers to control gene expression; GR negatively controls muscle mass and strength by downregulating anabolic pathways. Myod1-bound enhancers contact gene promoters via CpG-bound Nrf1 and CTCF-anchored chromatin loops in a myofiber-specific manner.","method":"ChIP-seq for Myod1 and GR; ATAC-seq; Hi-C/4C chromatin conformation capture; GR conditional KO mouse model; muscle force/mass measurements","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq, chromatin conformation capture, genetic KO with functional phenotyping, multiple orthogonal methods","pmids":["33836079"],"is_preprint":false},{"year":2022,"finding":"MyoD functions as a 3D genome organizer in muscle cells, establishing muscle-specific chromatin loop architecture. MyoD-null mouse muscle cells lack MyoD-induced chromatin loops; H3K27ac deposition is insufficient for establishing these loops, indicating MyoD is directly required for their formation.","method":"Hi-C in wild-type and MyoD-null mouse muscle cells; ChIP-seq for H3K27ac; chromatin loop analysis","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Hi-C with KO comparison, ChIP-seq validation, multiple orthogonal genomic methods","pmids":["35017543"],"is_preprint":false},{"year":2023,"finding":"MDFIC and MDFI (MyoD-family inhibitor proteins) are PIEZO1/2 interacting partners that bind PIEZO channels and regulate channel inactivation. Cryo-EM mapping shows MDFIC's lipidated C-terminal helix inserts laterally into the PIEZO1 pore module. These proteins function as auxiliary subunits of Piezo channels, explaining cell-type-specific differences in Piezo gating kinetics.","method":"Co-immunoprecipitation; single-particle cryo-EM structure determination; functional electrophysiology of channel inactivation","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure plus Co-IP plus functional electrophysiology in one study","pmids":["37590348"],"is_preprint":false},{"year":2000,"finding":"EID-1, a novel protein with an LXCXE Rb-binding motif, represses MyoD-dependent transcription by binding and inhibiting p300 histone acetyltransferase activity (an essential MyoD coactivator), independently of G1 cell cycle exit. Repression is potentiated by a mutation preventing EID-1 binding to Rb.","method":"Yeast two-hybrid; Co-IP; reporter gene assays; p300 HAT activity assay; domain mutant analysis","journal":"Molecular and Cellular Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, HAT activity assay, and functional reporter assay, single lab","pmids":["11073990"],"is_preprint":false},{"year":2003,"finding":"STAT3 directly interacts with MyoD, inhibiting both MyoD DNA-binding activity and transcriptional activity. STAT3-mediated inhibition of MyoD activity can be reversed by supplementing p300/CBP and PCAF, suggesting STAT3 competes for these coactivators. Reciprocally, MyoD inhibits STAT3 DNA binding activity.","method":"Co-immunoprecipitation; EMSA for DNA binding; reporter gene assays; p300/CBP/PCAF rescue experiments","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and direct DNA binding inhibition assay plus coactivator rescue, single lab","pmids":["12947115"],"is_preprint":false},{"year":2005,"finding":"E-protein HEB beta is upregulated during early terminal differentiation. A MyoD–HEBβ heterodimer binds the E1 E-box of the myogenin promoter to activate transcription upon differentiation. Knockdown of HEBβ by siRNA in myoblasts blocks differentiation and inhibits myogenin induction.","method":"siRNA knockdown; Co-IP; ChIP; reporter gene assays; Western blotting during differentiation","journal":"Molecular and Cellular Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function, Co-IP, ChIP at myogenin promoter, single lab","pmids":["16847330"],"is_preprint":false},{"year":2005,"finding":"p57 induction by MyoD during differentiation occurs through a p73-dependent, E-box-independent transcriptional mechanism requiring de novo protein synthesis. MyoD induces p73 alpha/beta/delta isoforms, which then activate p57 transcription; dominant-negative p73 interferes with p57 induction.","method":"Reporter assays with p57 promoter; p73 overexpression; dominant-negative p73; Western blotting","journal":"Journal of Molecular Biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reporter assays plus dominant-negative, indirect pathway through p73, single lab","pmids":["16405903"],"is_preprint":false},{"year":2013,"finding":"MyoD binds directly to a mesodermal enhancer (CS9) of the H19 gene, and CS9 physically contacts the H19 promoter (demonstrated by chromatin conformation capture), increasing H19 expression. H19 RNA in turn represses Igf2, and Igf2 negatively regulates MyoD expression, forming a negative feedback loop. Loss of both MyoD and Igf2 causes severe diaphragm atrophy.","method":"ChIP for MyoD binding to CS9; 3C (chromatin conformation capture); double-mutant (Myod/Igf2) mouse model","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, 3C, and genetic double-KO model with defined phenotype, single lab","pmids":["23406902"],"is_preprint":false},{"year":2013,"finding":"Six1 binds the MyoD Core Enhancer Region (CER) in myoblasts and regenerating muscle, and is required for CER reporter activity and proper chromatin structure at the CER as well as for MyoD binding at its own enhancer (a positive autoregulatory loop involving Six1).","method":"ChIP for Six1 binding to MyoD CER; siRNA knockdown of Six1; reporter assays with CER constructs and mutated Six1-binding sites; assessment of chromatin structure","journal":"PLOS ONE","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus siRNA plus reporter assay, single lab","pmids":["23840772"],"is_preprint":false},{"year":2014,"finding":"Ebf3 (and the family member Ebf1 in skeletal muscle) binds directly to the Atp2a1 (Serca1) promoter and synergizes with MyoD to induce Atp2a1 transcription, controlling muscle relaxation by regulating Ca2+ efflux.","method":"ChIP demonstrating Ebf3 binding to Atp2a1 promoter; co-transfection reporter assays with MyoD and Ebf3/1; Ebf3 KO mouse model; transgenic rescue","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP plus reporter assay plus KO mouse with transgenic rescue, multiple orthogonal methods","pmids":["24786561"],"is_preprint":false},{"year":2019,"finding":"Promiscuous binding of MyoD to neuronal target genes in fibroblasts results in neuronal reprogramming when the muscle program is inhibited by Myt1l. Quantitative differences in binding distinguish MyoD-activated from non-activated genes; strong MyoD-binding sites are co-enriched with non-bHLH motifs (unlike Ascl1), making MyoD more context dependent.","method":"ChIP-seq in fibroblasts; ATAC-seq; gain-of-function with MyoD+Myt1l; comparative binding analysis of MyoD vs Ascl1","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-seq plus ATAC-seq plus functional reprogramming assay, single lab","pmids":["32231311"],"is_preprint":false}],"current_model":"MyoD1 is a nuclear phosphoprotein and bHLH transcription factor that functions as a master regulator of skeletal myogenesis: its basic region mediates nuclear localization and DNA binding to E-box sequences (preferentially as heterodimers with E proteins, with dimerization driven by favorable DNA contacts), its Myc-homology/HLH domain enables dimerization and lineage commitment, and its N-terminal activation domain (normally masked) drives muscle-specific transcription; MyoD activity is regulated at multiple levels including acetylation by PCAF/CBP/p300 (which promotes interaction with the CBP/p300 bromodomain and enhances DNA binding), phosphorylation by cyclin B–Cdc2 (promoting degradation at G2/M), methylation by G9a (triggering ubiquitin-proteasome degradation via Cul4/Ddb1/Dcaf1, countered by Jmjd2C demethylase), ubiquitination at the N-terminus (by HUWE1) or on lysines, and translational repression of its mRNA by Staufen1 in quiescent satellite cells; MyoD assembles condition-specific enhancers genome-wide by recruiting Set7, p300, and other transcription factors, organizes muscle-specific 3D chromatin loops, and induces muscle differentiation genes while also activating miR-206/miR-1 to suppress non-muscle genes and promote apoptosis via Pax3 downregulation; its transcription is controlled by an autoregulatory loop with FoxO3/Pax3/7, Six1, MASTR/MEF2, Gli2, CLOCK/BMAL1, and MSX1 acting on distal enhancers; and several co-regulators modulate its activity including KAP1 (a phosphorylation-switchable scaffold), HP1α/β, FHL3, HEBβ, NFATc3, STAT3, and the lncRNA Linc-RAM."},"narrative":{"mechanistic_narrative":"MYOD1 is a basic helix-loop-helix (bHLH) transcription factor that acts as a master regulator of skeletal myogenesis, capable of converting non-muscle cells into the myogenic lineage [PMID:3175662]. Its function is partitioned into separable domains: a basic region (residues 102–135) directs nuclear localization, an N-terminal activation domain (within the first 53 residues) drives muscle-specific transcription but is normally masked, and a Myc-homology/HLH motif mediates lineage commitment and growth inhibition independently of differentiation [PMID:3175662, PMID:1651276, PMID:2359457]. The HLH motif drives dimerization, and MyoD binds CANNTG E-box DNA preferentially as heterodimers with ubiquitous E proteins, with heterodimer selection driven by favorable DNA contacts rather than intrinsic protein affinity [PMID:1945842, PMID:9488706]. MyoD specificity is sharpened by co-factors: PBX/MEIS-assisted binding at 'private' E-box sites is required for full myogenic identity over alternative neuronal fates [PMID:25801030, PMID:32231311]. Through E-box recognition MyoD directly transactivates muscle structural and differentiation genes (e.g., the acetylcholine receptor α-subunit) and the fusogens Myomaker and Myomixer to drive myoblast fusion, while also inducing muscle-specific microRNAs (miR-206, miR-1) that silence non-muscle targets such as Fstl1, Utrn, and Pax3 and promote myoblast apoptosis [PMID:2342565, PMID:33355126, PMID:17030984, PMID:20956382]. MyoD couples differentiation to cell-cycle exit by inducing p21 to enforce arrest during terminal differentiation [PMID:7791789]. Genome-wide, MyoD assembles condition-specific muscle enhancers, recruiting the H3K4 monomethylase Set7 and organizing muscle-specific 3D chromatin loop architecture [PMID:23249738, PMID:35017543]. MyoD activity is controlled at multiple post-translational levels — acetylation by CBP/p300 and PCAF enhances DNA binding and recruits the CBP/p300 bromodomain [PMID:10944526, PMID:11463815], cyclin B–Cdc2 phosphorylation at Ser5/Ser200 destabilizes it during G2/M [PMID:14749395], and N-terminal/lysine ubiquitination (including by HUWE1) and G9a methylation target it for proteasomal degradation [PMID:12397066, PMID:22277673, PMID:26149774] — and its own transcription is governed by an autoregulatory loop together with distal-enhancer inputs from FoxO3/Pax3, Six1, MASTR/MEF2, and CLOCK/BMAL1 [PMID:2546677, PMID:18854138, PMID:23840772, PMID:22279050, PMID:20956306]. In quiescent muscle stem cells, Staufen1 represses MyoD mRNA translation to maintain quiescence despite abundant transcript [PMID:29073096]. Note that timeline discovery [PMID:37590348] concerns MDFIC/MDFI, MyoD-family inhibitor proteins acting as PIEZO channel auxiliary subunits, and does not describe MYOD1 itself.","teleology":[{"year":1988,"claim":"Established that MyoD1 is a modular nuclear protein in which distinct short domains independently confer nuclear localization and myogenic-inducing activity, defining it as a discrete master myogenic regulator.","evidence":"Deletional mutagenesis of MyoD1 cDNA with stable fibroblast transfection and antisera localization","pmids":["3175662"],"confidence":"High","gaps":["Did not define the DNA sequence recognized or the dimerization requirement","Domain boundaries mapped functionally, not structurally"]},{"year":1989,"claim":"Answered how MyoD expression is sustained and amplified, showing a positive autoregulatory loop and a mutual cross-activation circuit with myogenin.","evidence":"cDNA transfection into fibroblast lines with endogenous mRNA induction readout","pmids":["2546677"],"confidence":"High","gaps":["Did not identify the enhancer elements or co-factors mediating autoregulation","Direct versus indirect activation not distinguished"]},{"year":1990,"claim":"Demonstrated direct transactivation of a muscle structural gene via cognate E-boxes, and that MyoD growth-inhibitory and differentiation functions are genetically separable.","evidence":"E-box mutagenesis with myotube reporter assays; domain-swap microinjection DNA-synthesis assays in fibroblasts","pmids":["2342565","2359457"],"confidence":"High","gaps":["Mechanism linking growth arrest to specific domains not molecularly defined","Did not identify the effectors of growth inhibition"]},{"year":1991,"claim":"Resolved the domain logic of transactivation and DNA binding, locating a normally masked N-terminal activation domain and showing the basic region requires a cell-type-specific recognition factor.","evidence":"Chimeric protein mutagenesis, reporter cotransfection, and VP16 domain-swap rescue","pmids":["1651276"],"confidence":"High","gaps":["Identity of the cell-type-specific recognition factor not determined","Mechanism of activation-domain masking unknown"]},{"year":1991,"claim":"Defined the biochemical basis of MyoD DNA binding as obligate heterodimerization with E proteins, since myogenic homodimers cannot bind DNA.","evidence":"In vitro dimerization assays and EMSA with purified bHLH proteins","pmids":["1945842"],"confidence":"High","gaps":["Did not explain what drives heterodimer selection in cells"]},{"year":1998,"claim":"Explained why MyoD–E47 heterodimers predominate, showing DNA contacts rather than protein–protein affinity drive heterodimer assembly.","evidence":"Fluorescence quenching, equilibrium binding, EMSA, and loop-swap mutagenesis of bHLH domains","pmids":["9488706"],"confidence":"High","gaps":["In vitro biophysics; cellular partner competition not addressed","No structural model of the DNA-bound complex"]},{"year":1995,"claim":"Connected MyoD-driven differentiation to cell-cycle exit by showing MyoD induces p21 to enforce arrest, and identified MSX1 as a direct transcriptional repressor of MyoD.","evidence":"C2C12 differentiation with p21 immunodepletion and ectopic expression; somatic cell hybrids, EMSA, and antisense for MSX1","pmids":["7791789","7664340"],"confidence":"High","gaps":["Mechanism of p21 promoter activation by MyoD not fully resolved here","MSX1 corepressor partners not identified"]},{"year":2000,"claim":"Identified acetylation as a positive regulatory mark, with CBP/p300 and PCAF acetylating MyoD near its DNA-binding domain to enhance activity.","evidence":"In vitro acetylation assays, acetylation-site mutagenesis, and microinjection functional assays","pmids":["10944526"],"confidence":"High","gaps":["Did not establish the structural consequence of acetylation on DNA binding"]},{"year":2000,"claim":"Revealed two further regulatory inputs: p57(Kip2) directly binds and stabilizes MyoD beyond CDK inhibition, while EID-1 represses MyoD by inhibiting p300 HAT activity.","evidence":"Endogenous Co-IP and half-life assays for p57; yeast two-hybrid, Co-IP, and HAT assays for EID-1","pmids":["10764802","11073990"],"confidence":"Medium","gaps":["EID-1 evidence is single-lab","p57 stabilization mechanism (which E3 it blocks) not defined"]},{"year":2001,"claim":"Mechanistically linked acetylation to coactivator recruitment, showing acetylated MyoD binds the CBP/p300 bromodomain with increased affinity.","evidence":"Endogenous reciprocal Co-IP, in vitro pull-down with acetylated MyoD, and bromodomain mutant analysis","pmids":["11463815"],"confidence":"High","gaps":["Quantitative contribution of bromodomain binding to in vivo transcription not isolated"]},{"year":2002,"claim":"Defined the proteolytic control of MyoD, mapping N-terminus-dependent and lysine-dependent ubiquitination pathways compartmentalized by NLS/NES.","evidence":"NLS/NES mutagenesis, N-terminal tag blocking, and pulse-chase compartment-specific degradation assays","pmids":["12397066"],"confidence":"High","gaps":["The responsible E3 ligases not identified in this study"]},{"year":2002,"claim":"Implicated Cdk9/cyclin T2a as a positive kinase partner that binds the bHLH region and enhances MyoD-dependent transcription and differentiation.","evidence":"Co-IP, in vitro kinase assay, and gain/dominant-negative expression in C2C12 cells","pmids":["12037670"],"confidence":"Medium","gaps":["Single-lab; physiological phosphosites on MyoD not mapped","Relationship to transcription elongation not resolved"]},{"year":2003,"claim":"Established mutual antagonism between MyoD and STAT3, with STAT3 inhibiting MyoD DNA binding by competing for shared p300/CBP/PCAF coactivators.","evidence":"Co-IP, EMSA, and coactivator rescue reporter assays","pmids":["12947115"],"confidence":"Medium","gaps":["Single-lab; in vivo relevance during signaling not established"]},{"year":2004,"claim":"Connected cell-cycle kinases to MyoD turnover, showing cyclin B–Cdc2 phosphorylation of Ser5/Ser200 destabilizes MyoD and downregulates p21 at G2/M.","evidence":"Phospho-site mutant inducible expression, kinase assays, and p21-null epistasis","pmids":["14749395"],"confidence":"High","gaps":["Degradation machinery downstream of phosphorylation not identified here"]},{"year":2005,"claim":"Dissected how MyoD outperforms Myf5 at terminal differentiation through N/C-terminal inter-domain cooperation, and identified the MyoD–HEBβ heterodimer and a p73-dependent route to p57 induction.","evidence":"Domain-deletion microarray/PCR profiling; siRNA/Co-IP/ChIP for HEBβ; reporter and dominant-negative assays for p73/p57","pmids":["16275751","16847330","16405903"],"confidence":"Medium","gaps":["Single-lab studies","Mechanism of inter-domain cooperation not structurally defined","p73-p57 link is indirect"]},{"year":2006,"claim":"Revealed that MyoD acts post-transcriptionally on the muscle program by directly activating miR-206, which silences Fstl1 and Utrn.","evidence":"ChIP at the miR-206 locus, 3'-UTR reporter assays, and MyoD gain-of-function","pmids":["17030984"],"confidence":"High","gaps":["Full repertoire of miR-206 targets not enumerated"]},{"year":2007,"claim":"Showed co-factors shape MyoD target specificity in vivo, with Pbx required for fast-muscle gene induction, and FHL3 acting as a direct negative regulator.","evidence":"Zebrafish Pbx/Myod/Myf5 morpholino epistasis with in situ hybridization; GST pull-down, Co-IP, and siRNA for FHL3","pmids":["17699609","17389685"],"confidence":"High","gaps":["Mechanism by which Pbx redirects MyoD binding not molecularly defined","FHL3 evidence single-lab"]},{"year":2008,"claim":"Defined the upstream transcriptional control of MyoD and additional repressors: codependent FoxO3/Pax3 activation, HP1α/β inhibition, and NFATc3 synergy at the myogenin promoter.","evidence":"ChIP, in vitro interactions, FoxO3-null regeneration assays; recombinant binding/Co-IP/ChIP for HP1; EMSA/ChIP and Myod/Nfatc3 double-null epistasis","pmids":["18854138","18599480","18676376"],"confidence":"High","gaps":["How FoxO3/Pax3 recruit Pol II structurally not resolved","HP1 work single-lab"]},{"year":2010,"claim":"Linked MyoD to circadian and apoptotic control, with CLOCK/BMAL1 rhythmically driving MyoD transcription and MyoD driving myoblast apoptosis via miR-1/miR-206 repression of Pax3.","evidence":"ChIP with Clock/Bmal1 mutant mice and physiological phenotyping; reciprocal miRNA gain/loss-of-function and 3'-UTR reporter mutagenesis","pmids":["20956306","20956382"],"confidence":"High","gaps":["Connection between circadian MyoD cycling and downstream physiology not fully mapped"]},{"year":2012,"claim":"Reframed MyoD as a genome-wide enhancer organizer that licenses muscle chromatin states, recruits Set7, and depends on upstream MASTR/MEF2 input; also identified HUWE1 as an N-terminal ubiquitin ligase.","evidence":"ChIP-seq with MyoD1-null and rescue myoblasts/myotubes; MASTR conditional KO with enhancer reporters; in vitro ubiquitination with site mapping","pmids":["23249738","22279050","22277673"],"confidence":"High","gaps":["HUWE1 evidence single-lab","Why H3K27ac restoration requires the myotube context not explained"]},{"year":2013,"claim":"Demonstrated MyoD operates within feedback loops involving long-range chromatin contacts, binding the H19 CS9 enhancer (H19–Igf2–MyoD feedback) and synergizing with Ebf3/1 at the Atp2a1 promoter.","evidence":"ChIP and 3C with Myod/Igf2 double mutants; ChIP, reporter assays, and Ebf3 KO with transgenic rescue","pmids":["23406902","24786561"],"confidence":"Medium","gaps":["H19 study single-lab","Direct mechanism of synergy with Ebf3 not structurally defined"]},{"year":2015,"claim":"Resolved how MyoD specifies myogenic versus alternative lineages and how a phospho-switchable scaffold gates its activity, via PBX/MEIS-assisted private-site binding, KAP1 corepressor/coactivator switching, and G9a-Jmjd2C methylation balance.","evidence":"ChIP-seq with chimeric factors and point mutagenesis; ChIP-seq/Co-IP/MSK1 kinase epistasis for KAP1; in vitro methylation/demethylation and Co-IP for G9a/Jmjd2C","pmids":["25801030","25737281","26149774"],"confidence":"High","gaps":["G9a/Jmjd2C evidence single-lab","How PBX/MEIS sites are selected genome-wide not fully defined"]},{"year":2017,"claim":"Showed MyoD activity depends on enhancer-RNA-producing core enhancers (LSD1-licensed), a Linc-RAM-scaffolded Baf60c/Brg1 remodeling complex, and Staufen1-mediated translational repression that maintains stem-cell quiescence.","evidence":"ChIP with conditional Lsd1 KO and CEeRNA measurement; RNA pull-down/Co-IP/ChIP and Linc-RAM KO mice; RNA pulldown, smFISH, and Staufen1+/- mouse model","pmids":["28228264","28091529","29073096"],"confidence":"High","gaps":["Mechanism by which the core-enhancer eRNA acts in cis not fully defined"]},{"year":2019,"claim":"Extended MyoD regulation to metabolite and RNA-mediated layers and quantified its context-dependent binding behavior, showing 2HG/IDH2 blocks myogenesis via H3K9 methylation, seRNA-1 recruits hnRNPL at the myoglobin super-enhancer, and weaker, motif-co-dependent binding makes MyoD more context dependent than Ascl1.","evidence":"MyoD-driven differentiation with IDH2-R172K, ATAC-seq, ChIP; CLIP/ChIP-seq/CAAA mutagenesis for seRNA-1; ChIP-seq/ATAC-seq and MyoD+Myt1l reprogramming","pmids":["31182575","31857580","32231311"],"confidence":"Medium","gaps":["seRNA-1 study single-lab","Generalizability of super-enhancer eRNA mechanism to other loci untested"]},{"year":2020,"claim":"Established MyoD as the necessary and sufficient switch for myoblast fusion by directly activating Myomaker and Myomixer via E-box motifs.","evidence":"CRISPR mutagenesis of MyoD, E-box-mutant reporters, and forced expression in non-muscle cells","pmids":["33355126"],"confidence":"High","gaps":["Co-factors required for fusogen induction not enumerated"]},{"year":2022,"claim":"Defined MyoD as a direct 3D-genome organizer that establishes muscle-specific chromatin loops independently of H3K27ac, and showed collaboration with the glucocorticoid receptor at myofiber enhancers anchored via Nrf1/CTCF loops.","evidence":"Hi-C in MyoD-null versus wild-type muscle cells with H3K27ac ChIP-seq; ChIP-seq/Hi-C/4C and GR conditional KO phenotyping","pmids":["35017543","33836079"],"confidence":"High","gaps":["Mechanism by which MyoD nucleates loop formation not defined","Whether loop organization is direct or via recruited architectural proteins unresolved"]},{"year":null,"claim":"How the many post-translational marks, co-factors, and architectural functions of MyoD are integrated dynamically to produce a single ordered differentiation trajectory remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of MyoD bound to chromatin with its co-factors","Temporal ordering of acetylation, phosphorylation, methylation, and ubiquitination across the cell cycle and differentiation not reconstructed","Quantitative rules distinguishing activated from bound-but-silent MyoD targets incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,3,16,35]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,5,8,28]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,12]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[24,37]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,3,35,45]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,3,24,36]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[24,27,37]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,6,14]}],"complexes":["MyoD–E protein bHLH heterodimer","MyoD–Baf60c–Brg1 chromatin remodeling complex","KAP1/TRIM28–MyoD–Mef2 scaffold"],"partners":["TCF3/E47","EP300","PCAF/KAT2B","PBX1","TRIM28","FOXO3","STAT3","HEB/TCF12"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P15172","full_name":"Myoblast determination protein 1","aliases":["Class C basic helix-loop-helix protein 1","bHLHc1","Myogenic factor 3","Myf-3"],"length_aa":320,"mass_kda":34.5,"function":"Acts as a transcriptional activator that promotes transcription of muscle-specific target genes and plays a role in muscle differentiation. Together with MYF5 and MYOG, co-occupies muscle-specific gene promoter core region during myogenesis. Induces fibroblasts to differentiate into myoblasts. Interacts with and is inhibited by the twist protein. This interaction probably involves the basic domains of both proteins (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P15172/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MYOD1","classification":"Not Classified","n_dependent_lines":11,"n_total_lines":1208,"dependency_fraction":0.009105960264900662},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MYOD1","total_profiled":1310},"omim":[{"mim_id":"621374","title":"SERINE/THREONINE/TYROSINE-INTERACTING PROTEIN-LIKE 2; STYXL2","url":"https://www.omim.org/entry/621374"},{"mim_id":"618975","title":"CONGENITAL MYOPATHY 17; CMYO17","url":"https://www.omim.org/entry/618975"},{"mim_id":"617766","title":"FAMILY WITH SEQUENCE SIMILARITY 192, MEMBER A; FAM192A","url":"https://www.omim.org/entry/617766"},{"mim_id":"617423","title":"PROLINE-RICH PROTEIN 14; PRR14","url":"https://www.omim.org/entry/617423"},{"mim_id":"617378","title":"MYOSIN, LIGHT CHAIN 11; MYL11","url":"https://www.omim.org/entry/617378"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"skeletal muscle","ntpm":34.4}],"url":"https://www.proteinatlas.org/search/MYOD1"},"hgnc":{"alias_symbol":["PUM","MYOD","bHLHc1"],"prev_symbol":["MYF3"]},"alphafold":{"accession":"P15172","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P15172","model_url":"https://alphafold.ebi.ac.uk/files/AF-P15172-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P15172-F1-predicted_aligned_error_v6.png","plddt_mean":61.16},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MYOD1","jax_strain_url":"https://www.jax.org/strain/search?query=MYOD1"},"sequence":{"accession":"P15172","fasta_url":"https://rest.uniprot.org/uniprotkb/P15172.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P15172/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P15172"}},"corpus_meta":[{"pmid":"1846704","id":"PMC_1846704","title":"The myoD gene family: nodal point during specification of the muscle cell lineage.","date":"1991","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/1846704","citation_count":1491,"is_preprint":false},{"pmid":"2473006","id":"PMC_2473006","title":"A gene with homology to the myc similarity region of MyoD1 is expressed during myogenesis and is sufficient to activate the muscle differentiation program.","date":"1989","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/2473006","citation_count":755,"is_preprint":false},{"pmid":"3175662","id":"PMC_3175662","title":"MyoD1: a nuclear phosphoprotein requiring a Myc homology region to convert fibroblasts to myoblasts.","date":"1988","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/3175662","citation_count":741,"is_preprint":false},{"pmid":"16099183","id":"PMC_16099183","title":"MyoD and the transcriptional control of myogenesis.","date":"2005","source":"Seminars in cell & developmental 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As few as 68 amino acids encompassing these two domains are sufficient to activate myogenesis in stably transfected 10T1/2 cells.\",\n      \"method\": \"Site-directed deletional mutagenesis of MyoD1 cDNA; stable transfection of fibroblasts; polyclonal antisera localization\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro mutagenesis combined with cell-based functional readout, foundational study replicated by multiple subsequent labs\",\n      \"pmids\": [\"3175662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"MyoD transcriptional activation maps to an N-terminal activation domain (within the first 53 residues), which is normally masked. A specific alanine in the basic region increases DNA binding and a specific threonine is required for transcriptional activation. The basic region requires a cell-type-specific 'recognition factor' to function. Replacement of the MyoD basic region with that of E12 abolishes transactivation but not DNA binding in most cell types.\",\n      \"method\": \"Chimeric protein mutagenesis; reporter gene cotransfection; in vivo DNA binding assays; VP16 domain-swap rescue\",\n      \"journal\": \"Genes & Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal mutagenesis and functional rescue experiments in one rigorous study\",\n      \"pmids\": [\"1651276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"MyoD1 activates its own transcription (positive autoregulation) in 10T1/2 and Swiss 3T6 cells. MyoD1 and myogenin engage in a mutual positive autoregulatory loop, each activating the other's expression.\",\n      \"method\": \"Transfection of MyoD1/myogenin cDNA expression vectors into fibroblast lines; measurement of endogenous mRNA induction\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean gain-of-function transfection with defined mRNA readout, widely replicated\",\n      \"pmids\": [\"2546677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Two adjacent MyoD1-binding sites (E-boxes) in the muscle-specific enhancer of the chicken acetylcholine receptor α-subunit gene are essential for full enhancer activity in transfected myotubes, demonstrating MyoD1 directly transactivates AChR gene expression.\",\n      \"method\": \"Site-directed mutagenesis of E-box elements; transient transfection reporter assays in myotubes\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of cognate binding sites with functional readout, landmark mechanistic paper\",\n      \"pmids\": [\"2342565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"MyoD1 inhibits cell proliferation independently of myogenic differentiation. Deletion of the Myc-like domain eliminates inhibition of DNA synthesis, while substitution of the basic domain with E12's basic domain inhibits growth but fails to induce differentiation, indicating growth inhibition and differentiation are separable functions.\",\n      \"method\": \"Microinjection of MyoD1 constructs into NIH 3T3 cells; deletion and domain-swap mutagenesis; DNA synthesis assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro functional dissection with domain-swap mutagenesis, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"2359457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The HLH motif of MyoD mediates dimerization, and dimerization partner determines MyoD activity. The four human muscle bHLH proteins (Myf3/MyoD, Myf4, Myf5, Myf6) form stable heterodimers with ubiquitous E proteins (E12, E2-2, E2-5) and bind CANNTG E-box sequences with similar efficiency; homodimers among Myf proteins do not bind DNA.\",\n      \"method\": \"In vitro dimerization assays; electrophoretic mobility shift assays (EMSA) with purified proteins\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro binding and dimerization assays, multiple proteins tested orthogonally\",\n      \"pmids\": [\"1945842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"MyoD induces p21 expression at the mRNA and protein levels during terminal muscle differentiation. p21 forms a complex with cyclin-dependent kinases in myotubes and is sufficient for cell cycle arrest. MyoD-transformed 10T1/2 fibroblasts (but not parental cells) upregulate p21 upon serum withdrawal, linking p21 induction to myogenic commitment.\",\n      \"method\": \"C2C12 differentiation; immunodepletion of p21 from myotube extracts; ectopic p21 expression; MyoD-transformed 10T1/2 cells; Northern and Western blotting\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays, loss-of-function (immunodepletion) and gain-of-function, widely replicated\",\n      \"pmids\": [\"7791789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"MSX1 directly binds the MyoD enhancer and represses MyoD transcription. Human chromosome 4 (containing MSX1) inhibits myoD activation in fibroblast × 10T1/2 hybrids; forced MSX1 expression represses myoD enhancer activity; antisense MSX1 relieves repression.\",\n      \"method\": \"Somatic cell hybrid analysis; enhancer/promoter reporter assays; EMSA showing Msx1 binding to MyoD enhancer; antisense suppression\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct DNA binding demonstrated by EMSA, functional rescue with antisense, multiple orthogonal approaches in one study\",\n      \"pmids\": [\"7664340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In the absence of DNA, MyoD bHLH domain is unfolded and monomeric, whereas E47 forms a stable homodimer. MyoD does not dimerize with E47 under dilute conditions without DNA. In the presence of specific DNA, MyoD–E47 form almost exclusively heterodimeric complexes, driven by favorable DNA contacts rather than protein–protein interactions. Substituting the E47 loop into MyoD allows DNA-free dimerization.\",\n      \"method\": \"Fluorescence quenching; equilibrium binding assays; EMSA; loop-swap mutagenesis of bHLH domains\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and multiple biophysical methods\",\n      \"pmids\": [\"9488706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"MyoD is acetylated by both CBP/p300 and PCAF on two lysines at the boundary of the DNA-binding domain. Acetylation by CBP/p300 increases MyoD activity on muscle-specific promoters. MyoD mutants that cannot be acetylated in vitro are not activated in functional microinjection assays. MyoD is constitutively acetylated in muscle cells.\",\n      \"method\": \"In vitro acetylation assays; microinjection functional assays; site-directed mutagenesis of acetylation sites; Western blotting\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay plus mutagenesis plus cell-based functional readout\",\n      \"pmids\": [\"10944526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Acetylated MyoD interacts with the bromodomain of CBP/p300. In muscle cells, endogenous acetylated MyoD associates with CBP/p300. In vitro, acetylation increases the affinity and salt resistance of the MyoD–CBP interaction. MyoD mutants unable to be acetylated fail to associate with CBP/p300 in vivo and are strongly impaired in transcriptional cooperation with CBP.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins; in vitro pull-down with acetylated/unacetylated MyoD; CBP bromodomain mutant analysis; reporter gene assays\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP of endogenous proteins plus in vitro pull-down, mutagenesis, functional assay\",\n      \"pmids\": [\"11463815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"p57(Kip2) directly binds MyoD via the NH2-terminal alpha-helix domain of p57 interacting with the bHLH domain of MyoD (basic region), stabilizing MyoD by increasing its half-life. This physical interaction was shown for both overexpressed and endogenous proteins. p57 increases MyoD transcriptional activity on muscle-specific genes through a mechanism distinct from CDK inhibition.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins in C2C12 cells; site-directed mutagenesis; competition/association assays; half-life measurements\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — endogenous Co-IP, mutagenesis, and functional assays in one study\",\n      \"pmids\": [\"10764802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MyoD is ubiquitinated preferentially at its N-terminus (N-terminus-dependent pathway) and degraded by the proteasome in the nucleus. The nuclear localization signal and nuclear export signal restrict ubiquitination and degradation to nuclear or cytoplasmic compartments. In the cytoplasm, lysine-dependent ubiquitination is more active; in the nucleus both pathways are active.\",\n      \"method\": \"Mutagenesis of NLS/NES; N-terminal 6×Myc tag blocking; pulse-chase half-life assays; compartment-restricted degradation assays\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic mutagenesis with compartment-specific functional readouts in one rigorous study\",\n      \"pmids\": [\"12397066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Cdk9/cyclin T2a forms a multimeric complex with MyoD in C2C12 cells, with the minimal cdk9-binding region mapping within residues 101–161 (bHLH region) of MyoD. Cdk9 phosphorylates MyoD in vitro. Overexpression of cdk9/cyclinT2a enhances MyoD-dependent transcription and myogenic differentiation; dominant-negative cdk9 represses it.\",\n      \"method\": \"Co-immunoprecipitation; in vitro kinase assay; overexpression and dominant-negative expression in C2C12 and MyoD-converted fibroblasts\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP complex, in vitro phosphorylation, and functional gain/loss-of-function in single lab\",\n      \"pmids\": [\"12037670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MyoD is phosphorylated on Ser5 and Ser200 by cyclin B–Cdc2 during G2/M, destabilizing MyoD and downregulating p21. A non-phosphorylatable MyoD A5/A200 mutant sustains p21 expression, inhibits cyclin B–Cdc2 kinase activity, delays M-phase entry, and requires p21 for this G2 arrest (not observed in p21−/− cells). MyoD interaction with P/CAF coactivator is enhanced when Cdc2 phosphorylation is absent.\",\n      \"method\": \"Inducible expression of phospho-site mutants; cyclin B–Cdc2 kinase assays; luciferase reporter assays; p21−/− cell epistasis\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay, mutagenesis, genetic epistasis with p21 KO cells, multiple orthogonal methods\",\n      \"pmids\": [\"14749395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MyoD NH2- and COOH-terminal regions cooperate to activate differentiation-phase target genes. MyoD is strikingly more effective than Myf5 at inducing terminal differentiation genes, a distinction arising from this novel inter-domain cooperation not present in Myf5.\",\n      \"method\": \"Microarray and PCR gene expression profiling; domain-deletion/chimeric constructs; in vitro myogenic conversion assays\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with functional readout, single lab, microarray plus PCR validation\",\n      \"pmids\": [\"16275751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MyoD directly activates transcription of the muscle-specific microRNA miR-206, which in turn targets the 3′-UTR sequences of Fstl1 and Utrn mRNAs to suppress their expression during skeletal muscle differentiation.\",\n      \"method\": \"ChIP demonstrating MyoD binding to miR-206 locus; 3′-UTR reporter assays; MyoD gain-of-function in fibroblasts\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus 3′-UTR reporter assays plus gain-of-function, multiple orthogonal methods\",\n      \"pmids\": [\"17030984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Pbx homeodomain proteins are required for MyoD to induce a subset of muscle genes including myogenin and fast-muscle genes in zebrafish somites. In the absence of Pbx function, Myod cannot induce fast-muscle but can still drive slow-muscle gene expression, demonstrating Pbx modulates MyoD target-gene specificity toward fast-fiber identity.\",\n      \"method\": \"Pbx loss-of-function (morpholino knockdown) in zebrafish embryos; combinatorial Pbx/Myod/Myf5 knockdown epistasis; in situ hybridization\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple combinatorial knockdowns, clear cellular phenotype, ortholog study in vertebrate model\",\n      \"pmids\": [\"17699609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"FHL3 directly binds MyoD (demonstrated by GST pull-down and co-localization in the nucleus of myoblasts) and acts as a potent negative co-transcriptional regulator: overexpression of FHL3 impairs MyoD-mediated transcriptional activity and delays myotube formation, while siRNA-mediated FHL3 knockdown enhances both.\",\n      \"method\": \"GST pull-down; Co-IP; nuclear co-localization; reporter gene assays; siRNA knockdown in C2C12 cells\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus Co-IP plus functional knockdown/overexpression, single lab\",\n      \"pmids\": [\"17389685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FoxO3 and Pax3/7 act as codependent transcriptional activators of MyoD in myoblasts, requiring each other to cooperatively recruit RNA polymerase II and form a preinitiation complex at the MyoD promoter. FoxO3-null mice show impaired muscle regeneration with reduced MyoD expression.\",\n      \"method\": \"Cell-based reporter assays; in vitro pull-down; ChIP; FoxO3 knockout mouse muscle regeneration assays\",\n      \"journal\": \"Developmental Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, in vitro interaction assay, and in vivo genetic loss-of-function with defined phenotype\",\n      \"pmids\": [\"18854138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HP1α and HP1β (but not HP1γ) directly interact with MyoD in myoblasts, as shown with recombinant proteins in vitro and Co-IP. HP1α and HP1β inhibit MyoD transcriptional activity in a reporter assay. ChIP shows preferential recruitment of HP1 to MyoD target gene promoters in proliferating myoblasts, and modulation of HP1 levels alters MyoD target gene expression.\",\n      \"method\": \"In vitro binding with recombinant proteins; Co-immunoprecipitation; reporter gene assay; ChIP\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro direct binding plus Co-IP plus ChIP plus functional reporter assay, single lab\",\n      \"pmids\": [\"18599480\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Calcineurin/NFATc2/c3 signaling cooperates synergistically with MyoD at the myogenin promoter. Two conserved NFAT binding sites in the myogenin promoter are occupied by NFATc3 upon differentiation, and combinatorial loss of myod and nfatc3 (but not either alone) severely impairs myogenin expression in vivo.\",\n      \"method\": \"Gel shift (EMSA) and ChIP for NFATc3 binding; genetic epistasis (double-null embryos); luciferase reporter assays\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP, EMSA, double KO genetic epistasis with in vivo readout, multiple orthogonal methods\",\n      \"pmids\": [\"18676376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CLOCK and BMAL1 directly bind the MyoD core enhancer in a rhythmic (circadian) manner and are required for normal MyoD mRNA and protein cycling. Clock and Bmal1 mutant mice show disrupted myofilament architecture and reduced maximal force, phenocopying aspects of MyoD-null muscle.\",\n      \"method\": \"ChIP demonstrating CLOCK/BMAL1 binding to MyoD promoter; Clock(Δ19) and Bmal1−/− mouse models; electron microscopy; force measurements; MyoD−/− comparison\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP with multiple genetic models, electron microscopy and physiological phenotyping, multiple orthogonal approaches\",\n      \"pmids\": [\"20956306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MyoD drives apoptosis of myoblasts through transcriptional activation of miR-1 and miR-206, which target the Pax3 3′-UTR (two conserved miR-1/miR-206 binding sites required) to down-regulate Pax3 and suppress antiapoptotic Bcl-2 and Bcl-xL. MyoD knockdown increases cell survival of wild-type myoblasts.\",\n      \"method\": \"MyoD−/− myoblasts; forced MyoD expression; miRNA gain/loss-of-function; 3′-UTR reporter assays with site mutations; siRNA knockdown of MyoD\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain/loss-of-function, 3′-UTR reporter mutagenesis, multiple orthogonal approaches\",\n      \"pmids\": [\"20956382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MyoD1 is required for condition-specific muscle enhancer assembly genome-wide. MyoD1-null myoblasts show loss of transcription factor recruitment and reduction of H3K4me1 and H3K27ac at enhancers. Re-expression of MyoD1 in null myoblasts restores H3K4me1 but not H3K27ac; re-expression in null myotubes restores both. MyoD1 recruits Set7 (H3K4 monomethylase) to enhancers.\",\n      \"method\": \"ChIP-seq for histone modifications and TF binding; MyoD1-null myoblasts and myotubes; MyoD1 re-expression; genome-wide chromatin state mapping\",\n      \"journal\": \"Genes & Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq with KO and rescue, multiple histone marks, rigorous controls\",\n      \"pmids\": [\"23249738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MASTR activates a muscle-specific postnatal MyoD enhancer through associations with MEF2 and Myocardin family members, thereby regulating MyoD expression in satellite cells. MASTR deletion impairs skeletal muscle regeneration due to satellite cell differentiation defects, mimicking MyoD deficiency.\",\n      \"method\": \"Satellite cell-specific and global MASTR knockout mice; reporter assays with MyoD enhancer; Co-IP between MASTR and MEF2/myocardin family members\",\n      \"journal\": \"Genes & Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined phenotype plus enhancer reporter and protein interaction assays, single lab\",\n      \"pmids\": [\"22279050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HUWE1 ubiquitinates MyoD at its N-terminal residue and targets it for proteasomal degradation.\",\n      \"method\": \"In vitro ubiquitination assay; co-expression studies; mapping of ubiquitination site to N-terminus\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination assay with site mapping, single lab\",\n      \"pmids\": [\"22277673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KAP1/TRIM28 is present with MyoD and Mef2 at muscle gene promoters in myoblasts, scaffolding both coactivators (p300, LSD1) and corepressors (G9a, HDAC1), resulting in net silencing. Upon differentiation, MSK1-mediated phosphorylation of KAP1 releases corepressors, enabling MyoD/Mef2 transcriptional activation.\",\n      \"method\": \"ChIP-seq; Co-IP of KAP1/MyoD/Mef2 complex; phospho-KAP1 analysis; MSK1 kinase and dominant-negative studies; reporter assays\",\n      \"journal\": \"Genes & Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq, complex Co-IP, kinase epistasis, multiple methods in one study\",\n      \"pmids\": [\"25737281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MyoD DNA-binding specificity at 'private' E-box sites (CAGGTG) cooperates with PBX/MEIS co-factor binding motifs to determine myogenic lineage specification. Point mutations preventing MyoD interaction with PBX/MEIS convert a MyoD–NeuroD2 chimera from a mixed muscle/neuronal factor to a pure neurogenic factor, showing PBX/MEIS-assisted private-site binding is required for full myogenic identity.\",\n      \"method\": \"ChIP-seq; chimeric factor design with swapped DNA-binding domains; genome-wide binding analysis; point mutagenesis to disrupt PBX/MEIS interaction\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — genome-wide binding analysis plus mutagenesis with functional lineage-conversion readout\",\n      \"pmids\": [\"25801030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"G9a methylates MyoD, promoting its ubiquitination-dependent degradation via the Cul4/Ddb1/Dcaf1 pathway. Jmjd2C demethylase directly associates with MyoD in vitro and in vivo, demethylates it, and stabilizes it, thereby increasing MyoD transcriptional activity and myogenic differentiation.\",\n      \"method\": \"Co-IP; in vitro demethylation and methylation assays; half-life measurement; Jmjd2C overexpression/knockdown; ChIP for H3K9me3\",\n      \"journal\": \"Biochimica et Biophysica Acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro enzymatic assays plus Co-IP plus functional knockdown/OE, single lab\",\n      \"pmids\": [\"26149774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LSD1/KDM1a is recruited to the MyoD core enhancer upon muscle differentiation, removes H3K9 methylation, and enables RNA polymerase II recruitment to the core enhancer for transcription of a non-coding enhancer RNA (CEeRNA) required for MyoD expression. Lsd1 conditional inactivation delays MyoD expression in limb buds during embryogenesis.\",\n      \"method\": \"ChIP; siRNA knockdown in myoblasts; conditional Lsd1 KO in muscle progenitors during embryogenesis; measurement of CEeRNA\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus conditional KO plus non-coding RNA functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"28228264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Staufen1 binds MyoD mRNA 3′-UTR in quiescent muscle stem cells and actively represses MyoD translation, maintaining quiescence despite high MyoD transcript levels. Staufen1+/− heterozygous muscle stem cells have increased MyoD protein, exit quiescence, and proliferate; blocking MyoD translation maintains quiescence.\",\n      \"method\": \"RNA pulldown; single-molecule FISH; single-cell co-staining; Staufen1+/− mouse model; translational repression rescue experiments\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNA pulldown, genetic model, and single-molecule analysis; multiple orthogonal approaches\",\n      \"pmids\": [\"29073096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Linc-RAM directly binds MyoD and promotes assembly of the MyoD–Baf60c–Brg1 chromatin remodeling complex on regulatory elements of myogenic target genes. Linc-RAM knockout mice display impaired muscle regeneration and satellite cell differentiation defects.\",\n      \"method\": \"RNA pull-down and Co-IP for Linc-RAM/MyoD interaction; Linc-RAM KO mice; ChIP for complex assembly at target gene regulatory elements\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct RNA–protein interaction assay, KO mouse model with in vivo phenotype, ChIP for complex assembly\",\n      \"pmids\": [\"28091529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MyoD activates enhancer RNA (seRNA-1) production at a super-enhancer. seRNA-1 binds hnRNPL via a CAAA tract and regulates RNA Pol II and H3K36me3 deposition at the myoglobin (Mb) locus, activating Mb transcription. Disruption of the seRNA-1/hnRNPL interaction attenuates this activation.\",\n      \"method\": \"ChIP-seq; RNA-seq; CLIP for seRNA-1/hnRNPL interaction; CAAA-tract mutagenesis; Pol II and H3K36me3 ChIP\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq plus RNA-protein interaction assay plus mutagenesis, single lab\",\n      \"pmids\": [\"31857580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"2-Hydroxyglutarate (2HG) produced by oncogenic IDH2 blocks MyoD-driven myogenic differentiation through H3K9 hypermethylation and impaired chromatin accessibility at myogenic loci, while DNA 5mC hypermethylation is dispensable for this differentiation block.\",\n      \"method\": \"MyoD-driven fibroblast differentiation model; IDH2-R172K expression; ATAC-seq; H3K9 methylation ChIP; 5mC profiling\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistically defined differentiation block via specific histone modification pathway, single lab, ATAC-seq and ChIP\",\n      \"pmids\": [\"31182575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MyoD is the key molecular switch required and sufficient to initiate Myomixer and Myomaker expression for human myoblast fusion, binding E-box motifs on their promoters. CRISPR mutagenesis of MyoD abrogates fusion; forced MyoD expression in non-muscle cells induces Myomixer and Myomaker.\",\n      \"method\": \"CRISPR mutagenesis of MyoD; luciferase reporter assays with E-box mutants; forced MyoD expression; biochemical assays\",\n      \"journal\": \"Science Advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with defined fusion phenotype, E-box mutagenesis in reporter assays, multiple orthogonal methods\",\n      \"pmids\": [\"33355126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Myod1 collaborates with the glucocorticoid receptor (GR) at skeletal muscle enhancers to control gene expression; GR negatively controls muscle mass and strength by downregulating anabolic pathways. Myod1-bound enhancers contact gene promoters via CpG-bound Nrf1 and CTCF-anchored chromatin loops in a myofiber-specific manner.\",\n      \"method\": \"ChIP-seq for Myod1 and GR; ATAC-seq; Hi-C/4C chromatin conformation capture; GR conditional KO mouse model; muscle force/mass measurements\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq, chromatin conformation capture, genetic KO with functional phenotyping, multiple orthogonal methods\",\n      \"pmids\": [\"33836079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MyoD functions as a 3D genome organizer in muscle cells, establishing muscle-specific chromatin loop architecture. MyoD-null mouse muscle cells lack MyoD-induced chromatin loops; H3K27ac deposition is insufficient for establishing these loops, indicating MyoD is directly required for their formation.\",\n      \"method\": \"Hi-C in wild-type and MyoD-null mouse muscle cells; ChIP-seq for H3K27ac; chromatin loop analysis\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Hi-C with KO comparison, ChIP-seq validation, multiple orthogonal genomic methods\",\n      \"pmids\": [\"35017543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MDFIC and MDFI (MyoD-family inhibitor proteins) are PIEZO1/2 interacting partners that bind PIEZO channels and regulate channel inactivation. Cryo-EM mapping shows MDFIC's lipidated C-terminal helix inserts laterally into the PIEZO1 pore module. These proteins function as auxiliary subunits of Piezo channels, explaining cell-type-specific differences in Piezo gating kinetics.\",\n      \"method\": \"Co-immunoprecipitation; single-particle cryo-EM structure determination; functional electrophysiology of channel inactivation\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure plus Co-IP plus functional electrophysiology in one study\",\n      \"pmids\": [\"37590348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"EID-1, a novel protein with an LXCXE Rb-binding motif, represses MyoD-dependent transcription by binding and inhibiting p300 histone acetyltransferase activity (an essential MyoD coactivator), independently of G1 cell cycle exit. Repression is potentiated by a mutation preventing EID-1 binding to Rb.\",\n      \"method\": \"Yeast two-hybrid; Co-IP; reporter gene assays; p300 HAT activity assay; domain mutant analysis\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, HAT activity assay, and functional reporter assay, single lab\",\n      \"pmids\": [\"11073990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"STAT3 directly interacts with MyoD, inhibiting both MyoD DNA-binding activity and transcriptional activity. STAT3-mediated inhibition of MyoD activity can be reversed by supplementing p300/CBP and PCAF, suggesting STAT3 competes for these coactivators. Reciprocally, MyoD inhibits STAT3 DNA binding activity.\",\n      \"method\": \"Co-immunoprecipitation; EMSA for DNA binding; reporter gene assays; p300/CBP/PCAF rescue experiments\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and direct DNA binding inhibition assay plus coactivator rescue, single lab\",\n      \"pmids\": [\"12947115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"E-protein HEB beta is upregulated during early terminal differentiation. A MyoD–HEBβ heterodimer binds the E1 E-box of the myogenin promoter to activate transcription upon differentiation. Knockdown of HEBβ by siRNA in myoblasts blocks differentiation and inhibits myogenin induction.\",\n      \"method\": \"siRNA knockdown; Co-IP; ChIP; reporter gene assays; Western blotting during differentiation\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function, Co-IP, ChIP at myogenin promoter, single lab\",\n      \"pmids\": [\"16847330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p57 induction by MyoD during differentiation occurs through a p73-dependent, E-box-independent transcriptional mechanism requiring de novo protein synthesis. MyoD induces p73 alpha/beta/delta isoforms, which then activate p57 transcription; dominant-negative p73 interferes with p57 induction.\",\n      \"method\": \"Reporter assays with p57 promoter; p73 overexpression; dominant-negative p73; Western blotting\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reporter assays plus dominant-negative, indirect pathway through p73, single lab\",\n      \"pmids\": [\"16405903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MyoD binds directly to a mesodermal enhancer (CS9) of the H19 gene, and CS9 physically contacts the H19 promoter (demonstrated by chromatin conformation capture), increasing H19 expression. H19 RNA in turn represses Igf2, and Igf2 negatively regulates MyoD expression, forming a negative feedback loop. Loss of both MyoD and Igf2 causes severe diaphragm atrophy.\",\n      \"method\": \"ChIP for MyoD binding to CS9; 3C (chromatin conformation capture); double-mutant (Myod/Igf2) mouse model\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, 3C, and genetic double-KO model with defined phenotype, single lab\",\n      \"pmids\": [\"23406902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Six1 binds the MyoD Core Enhancer Region (CER) in myoblasts and regenerating muscle, and is required for CER reporter activity and proper chromatin structure at the CER as well as for MyoD binding at its own enhancer (a positive autoregulatory loop involving Six1).\",\n      \"method\": \"ChIP for Six1 binding to MyoD CER; siRNA knockdown of Six1; reporter assays with CER constructs and mutated Six1-binding sites; assessment of chromatin structure\",\n      \"journal\": \"PLOS ONE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus siRNA plus reporter assay, single lab\",\n      \"pmids\": [\"23840772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ebf3 (and the family member Ebf1 in skeletal muscle) binds directly to the Atp2a1 (Serca1) promoter and synergizes with MyoD to induce Atp2a1 transcription, controlling muscle relaxation by regulating Ca2+ efflux.\",\n      \"method\": \"ChIP demonstrating Ebf3 binding to Atp2a1 promoter; co-transfection reporter assays with MyoD and Ebf3/1; Ebf3 KO mouse model; transgenic rescue\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP plus reporter assay plus KO mouse with transgenic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"24786561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Promiscuous binding of MyoD to neuronal target genes in fibroblasts results in neuronal reprogramming when the muscle program is inhibited by Myt1l. Quantitative differences in binding distinguish MyoD-activated from non-activated genes; strong MyoD-binding sites are co-enriched with non-bHLH motifs (unlike Ascl1), making MyoD more context dependent.\",\n      \"method\": \"ChIP-seq in fibroblasts; ATAC-seq; gain-of-function with MyoD+Myt1l; comparative binding analysis of MyoD vs Ascl1\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-seq plus ATAC-seq plus functional reprogramming assay, single lab\",\n      \"pmids\": [\"32231311\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MyoD1 is a nuclear phosphoprotein and bHLH transcription factor that functions as a master regulator of skeletal myogenesis: its basic region mediates nuclear localization and DNA binding to E-box sequences (preferentially as heterodimers with E proteins, with dimerization driven by favorable DNA contacts), its Myc-homology/HLH domain enables dimerization and lineage commitment, and its N-terminal activation domain (normally masked) drives muscle-specific transcription; MyoD activity is regulated at multiple levels including acetylation by PCAF/CBP/p300 (which promotes interaction with the CBP/p300 bromodomain and enhances DNA binding), phosphorylation by cyclin B–Cdc2 (promoting degradation at G2/M), methylation by G9a (triggering ubiquitin-proteasome degradation via Cul4/Ddb1/Dcaf1, countered by Jmjd2C demethylase), ubiquitination at the N-terminus (by HUWE1) or on lysines, and translational repression of its mRNA by Staufen1 in quiescent satellite cells; MyoD assembles condition-specific enhancers genome-wide by recruiting Set7, p300, and other transcription factors, organizes muscle-specific 3D chromatin loops, and induces muscle differentiation genes while also activating miR-206/miR-1 to suppress non-muscle genes and promote apoptosis via Pax3 downregulation; its transcription is controlled by an autoregulatory loop with FoxO3/Pax3/7, Six1, MASTR/MEF2, Gli2, CLOCK/BMAL1, and MSX1 acting on distal enhancers; and several co-regulators modulate its activity including KAP1 (a phosphorylation-switchable scaffold), HP1α/β, FHL3, HEBβ, NFATc3, STAT3, and the lncRNA Linc-RAM.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MYOD1 is a basic helix-loop-helix (bHLH) transcription factor that acts as a master regulator of skeletal myogenesis, capable of converting non-muscle cells into the myogenic lineage [#0]. Its function is partitioned into separable domains: a basic region (residues 102–135) directs nuclear localization, an N-terminal activation domain (within the first 53 residues) drives muscle-specific transcription but is normally masked, and a Myc-homology/HLH motif mediates lineage commitment and growth inhibition independently of differentiation [#0, #1, #4]. The HLH motif drives dimerization, and MyoD binds CANNTG E-box DNA preferentially as heterodimers with ubiquitous E proteins, with heterodimer selection driven by favorable DNA contacts rather than intrinsic protein affinity [#5, #8]. MyoD specificity is sharpened by co-factors: PBX/MEIS-assisted binding at 'private' E-box sites is required for full myogenic identity over alternative neuronal fates [#28, #46]. Through E-box recognition MyoD directly transactivates muscle structural and differentiation genes (e.g., the acetylcholine receptor α-subunit) and the fusogens Myomaker and Myomixer to drive myoblast fusion, while also inducing muscle-specific microRNAs (miR-206, miR-1) that silence non-muscle targets such as Fstl1, Utrn, and Pax3 and promote myoblast apoptosis [#3, #35, #16, #23]. MyoD couples differentiation to cell-cycle exit by inducing p21 to enforce arrest during terminal differentiation [#6]. Genome-wide, MyoD assembles condition-specific muscle enhancers, recruiting the H3K4 monomethylase Set7 and organizing muscle-specific 3D chromatin loop architecture [#24, #37]. MyoD activity is controlled at multiple post-translational levels — acetylation by CBP/p300 and PCAF enhances DNA binding and recruits the CBP/p300 bromodomain [#9, #10], cyclin B–Cdc2 phosphorylation at Ser5/Ser200 destabilizes it during G2/M [#14], and N-terminal/lysine ubiquitination (including by HUWE1) and G9a methylation target it for proteasomal degradation [#12, #26, #29] — and its own transcription is governed by an autoregulatory loop together with distal-enhancer inputs from FoxO3/Pax3, Six1, MASTR/MEF2, and CLOCK/BMAL1 [#2, #19, #44, #25, #22]. In quiescent muscle stem cells, Staufen1 represses MyoD mRNA translation to maintain quiescence despite abundant transcript [#31]. Note that timeline discovery [#38] concerns MDFIC/MDFI, MyoD-family inhibitor proteins acting as PIEZO channel auxiliary subunits, and does not describe MYOD1 itself.\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Established that MyoD1 is a modular nuclear protein in which distinct short domains independently confer nuclear localization and myogenic-inducing activity, defining it as a discrete master myogenic regulator.\",\n      \"evidence\": \"Deletional mutagenesis of MyoD1 cDNA with stable fibroblast transfection and antisera localization\",\n      \"pmids\": [\"3175662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the DNA sequence recognized or the dimerization requirement\", \"Domain boundaries mapped functionally, not structurally\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Answered how MyoD expression is sustained and amplified, showing a positive autoregulatory loop and a mutual cross-activation circuit with myogenin.\",\n      \"evidence\": \"cDNA transfection into fibroblast lines with endogenous mRNA induction readout\",\n      \"pmids\": [\"2546677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the enhancer elements or co-factors mediating autoregulation\", \"Direct versus indirect activation not distinguished\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Demonstrated direct transactivation of a muscle structural gene via cognate E-boxes, and that MyoD growth-inhibitory and differentiation functions are genetically separable.\",\n      \"evidence\": \"E-box mutagenesis with myotube reporter assays; domain-swap microinjection DNA-synthesis assays in fibroblasts\",\n      \"pmids\": [\"2342565\", \"2359457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking growth arrest to specific domains not molecularly defined\", \"Did not identify the effectors of growth inhibition\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Resolved the domain logic of transactivation and DNA binding, locating a normally masked N-terminal activation domain and showing the basic region requires a cell-type-specific recognition factor.\",\n      \"evidence\": \"Chimeric protein mutagenesis, reporter cotransfection, and VP16 domain-swap rescue\",\n      \"pmids\": [\"1651276\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the cell-type-specific recognition factor not determined\", \"Mechanism of activation-domain masking unknown\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Defined the biochemical basis of MyoD DNA binding as obligate heterodimerization with E proteins, since myogenic homodimers cannot bind DNA.\",\n      \"evidence\": \"In vitro dimerization assays and EMSA with purified bHLH proteins\",\n      \"pmids\": [\"1945842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain what drives heterodimer selection in cells\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Explained why MyoD–E47 heterodimers predominate, showing DNA contacts rather than protein–protein affinity drive heterodimer assembly.\",\n      \"evidence\": \"Fluorescence quenching, equilibrium binding, EMSA, and loop-swap mutagenesis of bHLH domains\",\n      \"pmids\": [\"9488706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro biophysics; cellular partner competition not addressed\", \"No structural model of the DNA-bound complex\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Connected MyoD-driven differentiation to cell-cycle exit by showing MyoD induces p21 to enforce arrest, and identified MSX1 as a direct transcriptional repressor of MyoD.\",\n      \"evidence\": \"C2C12 differentiation with p21 immunodepletion and ectopic expression; somatic cell hybrids, EMSA, and antisense for MSX1\",\n      \"pmids\": [\"7791789\", \"7664340\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of p21 promoter activation by MyoD not fully resolved here\", \"MSX1 corepressor partners not identified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified acetylation as a positive regulatory mark, with CBP/p300 and PCAF acetylating MyoD near its DNA-binding domain to enhance activity.\",\n      \"evidence\": \"In vitro acetylation assays, acetylation-site mutagenesis, and microinjection functional assays\",\n      \"pmids\": [\"10944526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the structural consequence of acetylation on DNA binding\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Revealed two further regulatory inputs: p57(Kip2) directly binds and stabilizes MyoD beyond CDK inhibition, while EID-1 represses MyoD by inhibiting p300 HAT activity.\",\n      \"evidence\": \"Endogenous Co-IP and half-life assays for p57; yeast two-hybrid, Co-IP, and HAT assays for EID-1\",\n      \"pmids\": [\"10764802\", \"11073990\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EID-1 evidence is single-lab\", \"p57 stabilization mechanism (which E3 it blocks) not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mechanistically linked acetylation to coactivator recruitment, showing acetylated MyoD binds the CBP/p300 bromodomain with increased affinity.\",\n      \"evidence\": \"Endogenous reciprocal Co-IP, in vitro pull-down with acetylated MyoD, and bromodomain mutant analysis\",\n      \"pmids\": [\"11463815\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of bromodomain binding to in vivo transcription not isolated\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the proteolytic control of MyoD, mapping N-terminus-dependent and lysine-dependent ubiquitination pathways compartmentalized by NLS/NES.\",\n      \"evidence\": \"NLS/NES mutagenesis, N-terminal tag blocking, and pulse-chase compartment-specific degradation assays\",\n      \"pmids\": [\"12397066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The responsible E3 ligases not identified in this study\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Implicated Cdk9/cyclin T2a as a positive kinase partner that binds the bHLH region and enhances MyoD-dependent transcription and differentiation.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, and gain/dominant-negative expression in C2C12 cells\",\n      \"pmids\": [\"12037670\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab; physiological phosphosites on MyoD not mapped\", \"Relationship to transcription elongation not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Established mutual antagonism between MyoD and STAT3, with STAT3 inhibiting MyoD DNA binding by competing for shared p300/CBP/PCAF coactivators.\",\n      \"evidence\": \"Co-IP, EMSA, and coactivator rescue reporter assays\",\n      \"pmids\": [\"12947115\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab; in vivo relevance during signaling not established\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected cell-cycle kinases to MyoD turnover, showing cyclin B–Cdc2 phosphorylation of Ser5/Ser200 destabilizes MyoD and downregulates p21 at G2/M.\",\n      \"evidence\": \"Phospho-site mutant inducible expression, kinase assays, and p21-null epistasis\",\n      \"pmids\": [\"14749395\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degradation machinery downstream of phosphorylation not identified here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Dissected how MyoD outperforms Myf5 at terminal differentiation through N/C-terminal inter-domain cooperation, and identified the MyoD–HEBβ heterodimer and a p73-dependent route to p57 induction.\",\n      \"evidence\": \"Domain-deletion microarray/PCR profiling; siRNA/Co-IP/ChIP for HEBβ; reporter and dominant-negative assays for p73/p57\",\n      \"pmids\": [\"16275751\", \"16847330\", \"16405903\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab studies\", \"Mechanism of inter-domain cooperation not structurally defined\", \"p73-p57 link is indirect\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Revealed that MyoD acts post-transcriptionally on the muscle program by directly activating miR-206, which silences Fstl1 and Utrn.\",\n      \"evidence\": \"ChIP at the miR-206 locus, 3'-UTR reporter assays, and MyoD gain-of-function\",\n      \"pmids\": [\"17030984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of miR-206 targets not enumerated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed co-factors shape MyoD target specificity in vivo, with Pbx required for fast-muscle gene induction, and FHL3 acting as a direct negative regulator.\",\n      \"evidence\": \"Zebrafish Pbx/Myod/Myf5 morpholino epistasis with in situ hybridization; GST pull-down, Co-IP, and siRNA for FHL3\",\n      \"pmids\": [\"17699609\", \"17389685\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Pbx redirects MyoD binding not molecularly defined\", \"FHL3 evidence single-lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the upstream transcriptional control of MyoD and additional repressors: codependent FoxO3/Pax3 activation, HP1α/β inhibition, and NFATc3 synergy at the myogenin promoter.\",\n      \"evidence\": \"ChIP, in vitro interactions, FoxO3-null regeneration assays; recombinant binding/Co-IP/ChIP for HP1; EMSA/ChIP and Myod/Nfatc3 double-null epistasis\",\n      \"pmids\": [\"18854138\", \"18599480\", \"18676376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How FoxO3/Pax3 recruit Pol II structurally not resolved\", \"HP1 work single-lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked MyoD to circadian and apoptotic control, with CLOCK/BMAL1 rhythmically driving MyoD transcription and MyoD driving myoblast apoptosis via miR-1/miR-206 repression of Pax3.\",\n      \"evidence\": \"ChIP with Clock/Bmal1 mutant mice and physiological phenotyping; reciprocal miRNA gain/loss-of-function and 3'-UTR reporter mutagenesis\",\n      \"pmids\": [\"20956306\", \"20956382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Connection between circadian MyoD cycling and downstream physiology not fully mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Reframed MyoD as a genome-wide enhancer organizer that licenses muscle chromatin states, recruits Set7, and depends on upstream MASTR/MEF2 input; also identified HUWE1 as an N-terminal ubiquitin ligase.\",\n      \"evidence\": \"ChIP-seq with MyoD1-null and rescue myoblasts/myotubes; MASTR conditional KO with enhancer reporters; in vitro ubiquitination with site mapping\",\n      \"pmids\": [\"23249738\", \"22279050\", \"22277673\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"HUWE1 evidence single-lab\", \"Why H3K27ac restoration requires the myotube context not explained\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated MyoD operates within feedback loops involving long-range chromatin contacts, binding the H19 CS9 enhancer (H19–Igf2–MyoD feedback) and synergizing with Ebf3/1 at the Atp2a1 promoter.\",\n      \"evidence\": \"ChIP and 3C with Myod/Igf2 double mutants; ChIP, reporter assays, and Ebf3 KO with transgenic rescue\",\n      \"pmids\": [\"23406902\", \"24786561\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"H19 study single-lab\", \"Direct mechanism of synergy with Ebf3 not structurally defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved how MyoD specifies myogenic versus alternative lineages and how a phospho-switchable scaffold gates its activity, via PBX/MEIS-assisted private-site binding, KAP1 corepressor/coactivator switching, and G9a-Jmjd2C methylation balance.\",\n      \"evidence\": \"ChIP-seq with chimeric factors and point mutagenesis; ChIP-seq/Co-IP/MSK1 kinase epistasis for KAP1; in vitro methylation/demethylation and Co-IP for G9a/Jmjd2C\",\n      \"pmids\": [\"25801030\", \"25737281\", \"26149774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"G9a/Jmjd2C evidence single-lab\", \"How PBX/MEIS sites are selected genome-wide not fully defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed MyoD activity depends on enhancer-RNA-producing core enhancers (LSD1-licensed), a Linc-RAM-scaffolded Baf60c/Brg1 remodeling complex, and Staufen1-mediated translational repression that maintains stem-cell quiescence.\",\n      \"evidence\": \"ChIP with conditional Lsd1 KO and CEeRNA measurement; RNA pull-down/Co-IP/ChIP and Linc-RAM KO mice; RNA pulldown, smFISH, and Staufen1+/- mouse model\",\n      \"pmids\": [\"28228264\", \"28091529\", \"29073096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the core-enhancer eRNA acts in cis not fully defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended MyoD regulation to metabolite and RNA-mediated layers and quantified its context-dependent binding behavior, showing 2HG/IDH2 blocks myogenesis via H3K9 methylation, seRNA-1 recruits hnRNPL at the myoglobin super-enhancer, and weaker, motif-co-dependent binding makes MyoD more context dependent than Ascl1.\",\n      \"evidence\": \"MyoD-driven differentiation with IDH2-R172K, ATAC-seq, ChIP; CLIP/ChIP-seq/CAAA mutagenesis for seRNA-1; ChIP-seq/ATAC-seq and MyoD+Myt1l reprogramming\",\n      \"pmids\": [\"31182575\", \"31857580\", \"32231311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"seRNA-1 study single-lab\", \"Generalizability of super-enhancer eRNA mechanism to other loci untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established MyoD as the necessary and sufficient switch for myoblast fusion by directly activating Myomaker and Myomixer via E-box motifs.\",\n      \"evidence\": \"CRISPR mutagenesis of MyoD, E-box-mutant reporters, and forced expression in non-muscle cells\",\n      \"pmids\": [\"33355126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Co-factors required for fusogen induction not enumerated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined MyoD as a direct 3D-genome organizer that establishes muscle-specific chromatin loops independently of H3K27ac, and showed collaboration with the glucocorticoid receptor at myofiber enhancers anchored via Nrf1/CTCF loops.\",\n      \"evidence\": \"Hi-C in MyoD-null versus wild-type muscle cells with H3K27ac ChIP-seq; ChIP-seq/Hi-C/4C and GR conditional KO phenotyping\",\n      \"pmids\": [\"35017543\", \"33836079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which MyoD nucleates loop formation not defined\", \"Whether loop organization is direct or via recruited architectural proteins unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many post-translational marks, co-factors, and architectural functions of MyoD are integrated dynamically to produce a single ordered differentiation trajectory remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of MyoD bound to chromatin with its co-factors\", \"Temporal ordering of acetylation, phosphorylation, methylation, and ubiquitination across the cell cycle and differentiation not reconstructed\", \"Quantitative rules distinguishing activated from bound-but-silent MyoD targets incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 3, 16, 35]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 5, 8, 28]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [3, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 12]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [24, 37]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 3, 35, 45]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 3, 24, 36]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [24, 27, 37]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 6, 14]}\n    ],\n    \"complexes\": [\n      \"MyoD–E protein bHLH heterodimer\",\n      \"MyoD–Baf60c–Brg1 chromatin remodeling complex\",\n      \"KAP1/TRIM28–MyoD–Mef2 scaffold\"\n    ],\n    \"partners\": [\n      \"TCF3/E47\",\n      \"EP300\",\n      \"PCAF/KAT2B\",\n      \"PBX1\",\n      \"TRIM28\",\n      \"FoxO3\",\n      \"STAT3\",\n      \"HEB/TCF12\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":10,"faith_total":10,"faith_pct":100.0}}