| 1988 |
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. |
Site-directed deletional mutagenesis of MyoD1 cDNA; stable transfection of fibroblasts; polyclonal antisera localization |
Science |
High |
3175662
|
| 1991 |
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. |
Chimeric protein mutagenesis; reporter gene cotransfection; in vivo DNA binding assays; VP16 domain-swap rescue |
Genes & Development |
High |
1651276
|
| 1989 |
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. |
Transfection of MyoD1/myogenin cDNA expression vectors into fibroblast lines; measurement of endogenous mRNA induction |
Cell |
High |
2546677
|
| 1990 |
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. |
Site-directed mutagenesis of E-box elements; transient transfection reporter assays in myotubes |
Nature |
High |
2342565
|
| 1990 |
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. |
Microinjection of MyoD1 constructs into NIH 3T3 cells; deletion and domain-swap mutagenesis; DNA synthesis assays |
Nature |
High |
2359457
|
| 1991 |
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. |
In vitro dimerization assays; electrophoretic mobility shift assays (EMSA) with purified proteins |
Nucleic Acids Research |
High |
1945842
|
| 1995 |
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. |
C2C12 differentiation; immunodepletion of p21 from myotube extracts; ectopic p21 expression; MyoD-transformed 10T1/2 cells; Northern and Western blotting |
Molecular and Cellular Biology |
High |
7791789
|
| 1995 |
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. |
Somatic cell hybrid analysis; enhancer/promoter reporter assays; EMSA showing Msx1 binding to MyoD enhancer; antisense suppression |
Cell |
High |
7664340
|
| 1998 |
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. |
Fluorescence quenching; equilibrium binding assays; EMSA; loop-swap mutagenesis of bHLH domains |
The Journal of Biological Chemistry |
High |
9488706
|
| 2000 |
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. |
In vitro acetylation assays; microinjection functional assays; site-directed mutagenesis of acetylation sites; Western blotting |
The Journal of Biological Chemistry |
High |
10944526
|
| 2001 |
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. |
Co-immunoprecipitation of endogenous proteins; in vitro pull-down with acetylated/unacetylated MyoD; CBP bromodomain mutant analysis; reporter gene assays |
Molecular and Cellular Biology |
High |
11463815
|
| 2000 |
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. |
Co-immunoprecipitation of endogenous proteins in C2C12 cells; site-directed mutagenesis; competition/association assays; half-life measurements |
The Journal of Biological Chemistry |
High |
10764802
|
| 2002 |
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. |
Mutagenesis of NLS/NES; N-terminal 6×Myc tag blocking; pulse-chase half-life assays; compartment-restricted degradation assays |
The Journal of Biological Chemistry |
High |
12397066
|
| 2002 |
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. |
Co-immunoprecipitation; in vitro kinase assay; overexpression and dominant-negative expression in C2C12 and MyoD-converted fibroblasts |
Oncogene |
Medium |
12037670
|
| 2004 |
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. |
Inducible expression of phospho-site mutants; cyclin B–Cdc2 kinase assays; luciferase reporter assays; p21−/− cell epistasis |
Molecular and Cellular Biology |
High |
14749395
|
| 2005 |
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. |
Microarray and PCR gene expression profiling; domain-deletion/chimeric constructs; in vitro myogenic conversion assays |
The Journal of Cell Biology |
Medium |
16275751
|
| 2006 |
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. |
ChIP demonstrating MyoD binding to miR-206 locus; 3′-UTR reporter assays; MyoD gain-of-function in fibroblasts |
The Journal of Cell Biology |
High |
17030984
|
| 2007 |
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. |
Pbx loss-of-function (morpholino knockdown) in zebrafish embryos; combinatorial Pbx/Myod/Myf5 knockdown epistasis; in situ hybridization |
Development |
High |
17699609
|
| 2007 |
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. |
GST pull-down; Co-IP; nuclear co-localization; reporter gene assays; siRNA knockdown in C2C12 cells |
Journal of Cell Science |
Medium |
17389685
|
| 2008 |
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. |
Cell-based reporter assays; in vitro pull-down; ChIP; FoxO3 knockout mouse muscle regeneration assays |
Developmental Cell |
High |
18854138
|
| 2008 |
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. |
In vitro binding with recombinant proteins; Co-immunoprecipitation; reporter gene assay; ChIP |
The Journal of Biological Chemistry |
Medium |
18599480
|
| 2008 |
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. |
Gel shift (EMSA) and ChIP for NFATc3 binding; genetic epistasis (double-null embryos); luciferase reporter assays |
The Journal of Biological Chemistry |
High |
18676376
|
| 2010 |
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. |
ChIP demonstrating CLOCK/BMAL1 binding to MyoD promoter; Clock(Δ19) and Bmal1−/− mouse models; electron microscopy; force measurements; MyoD−/− comparison |
PNAS |
High |
20956306
|
| 2010 |
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. |
MyoD−/− myoblasts; forced MyoD expression; miRNA gain/loss-of-function; 3′-UTR reporter assays with site mutations; siRNA knockdown of MyoD |
The Journal of Cell Biology |
High |
20956382
|
| 2012 |
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. |
ChIP-seq for histone modifications and TF binding; MyoD1-null myoblasts and myotubes; MyoD1 re-expression; genome-wide chromatin state mapping |
Genes & Development |
High |
23249738
|
| 2012 |
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. |
Satellite cell-specific and global MASTR knockout mice; reporter assays with MyoD enhancer; Co-IP between MASTR and MEF2/myocardin family members |
Genes & Development |
Medium |
22279050
|
| 2012 |
HUWE1 ubiquitinates MyoD at its N-terminal residue and targets it for proteasomal degradation. |
In vitro ubiquitination assay; co-expression studies; mapping of ubiquitination site to N-terminus |
Biochemical and Biophysical Research Communications |
Medium |
22277673
|
| 2015 |
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. |
ChIP-seq; Co-IP of KAP1/MyoD/Mef2 complex; phospho-KAP1 analysis; MSK1 kinase and dominant-negative studies; reporter assays |
Genes & Development |
High |
25737281
|
| 2015 |
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. |
ChIP-seq; chimeric factor design with swapped DNA-binding domains; genome-wide binding analysis; point mutagenesis to disrupt PBX/MEIS interaction |
Cell Reports |
High |
25801030
|
| 2015 |
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. |
Co-IP; in vitro demethylation and methylation assays; half-life measurement; Jmjd2C overexpression/knockdown; ChIP for H3K9me3 |
Biochimica et Biophysica Acta |
Medium |
26149774
|
| 2017 |
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. |
ChIP; siRNA knockdown in myoblasts; conditional Lsd1 KO in muscle progenitors during embryogenesis; measurement of CEeRNA |
Cell Reports |
High |
28228264
|
| 2017 |
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. |
RNA pulldown; single-molecule FISH; single-cell co-staining; Staufen1+/− mouse model; translational repression rescue experiments |
PNAS |
High |
29073096
|
| 2017 |
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. |
RNA pull-down and Co-IP for Linc-RAM/MyoD interaction; Linc-RAM KO mice; ChIP for complex assembly at target gene regulatory elements |
Nature Communications |
High |
28091529
|
| 2019 |
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. |
ChIP-seq; RNA-seq; CLIP for seRNA-1/hnRNPL interaction; CAAA-tract mutagenesis; Pol II and H3K36me3 ChIP |
Nature Communications |
Medium |
31857580
|
| 2019 |
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. |
MyoD-driven fibroblast differentiation model; IDH2-R172K expression; ATAC-seq; H3K9 methylation ChIP; 5mC profiling |
PNAS |
Medium |
31182575
|
| 2020 |
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. |
CRISPR mutagenesis of MyoD; luciferase reporter assays with E-box mutants; forced MyoD expression; biochemical assays |
Science Advances |
High |
33355126
|
| 2021 |
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. |
ChIP-seq for Myod1 and GR; ATAC-seq; Hi-C/4C chromatin conformation capture; GR conditional KO mouse model; muscle force/mass measurements |
Nucleic Acids Research |
High |
33836079
|
| 2022 |
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. |
Hi-C in wild-type and MyoD-null mouse muscle cells; ChIP-seq for H3K27ac; chromatin loop analysis |
Nature Communications |
High |
35017543
|
| 2023 |
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. |
Co-immunoprecipitation; single-particle cryo-EM structure determination; functional electrophysiology of channel inactivation |
Science |
High |
37590348
|
| 2000 |
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. |
Yeast two-hybrid; Co-IP; reporter gene assays; p300 HAT activity assay; domain mutant analysis |
Molecular and Cellular Biology |
Medium |
11073990
|
| 2003 |
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. |
Co-immunoprecipitation; EMSA for DNA binding; reporter gene assays; p300/CBP/PCAF rescue experiments |
The Journal of Biological Chemistry |
Medium |
12947115
|
| 2005 |
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. |
siRNA knockdown; Co-IP; ChIP; reporter gene assays; Western blotting during differentiation |
Molecular and Cellular Biology |
Medium |
16847330
|
| 2005 |
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. |
Reporter assays with p57 promoter; p73 overexpression; dominant-negative p73; Western blotting |
Journal of Molecular Biology |
Medium |
16405903
|
| 2013 |
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. |
ChIP for MyoD binding to CS9; 3C (chromatin conformation capture); double-mutant (Myod/Igf2) mouse model |
Development |
Medium |
23406902
|
| 2013 |
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). |
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 |
PLOS ONE |
Medium |
23840772
|
| 2014 |
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. |
ChIP demonstrating Ebf3 binding to Atp2a1 promoter; co-transfection reporter assays with MyoD and Ebf3/1; Ebf3 KO mouse model; transgenic rescue |
Nature Communications |
High |
24786561
|
| 2019 |
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. |
ChIP-seq in fibroblasts; ATAC-seq; gain-of-function with MyoD+Myt1l; comparative binding analysis of MyoD vs Ascl1 |
Nature Cell Biology |
High |
32231311
|