{"gene":"MEF2C","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1999,"finding":"p38 MAPK directly activates MEF2C (a known substrate of p38) during skeletal muscle differentiation, and MEF2C protein and MEF2-binding sites are required for p38 to regulate muscle creatine kinase reporter gene transcription; inhibition of p38 with SB203580 blocked myoblast fusion and MEF2 family member expression.","method":"Pharmacological inhibition (SB203580), overexpression of MKK6/p38, reporter gene assays in 10T1/2 fibroblasts and L8 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (kinase inhibitor, overexpression, reporter assay), replicated across cell types; p38 phosphorylation of MEF2C was already established prior to this study","pmids":["9988769"],"is_preprint":false},{"year":2001,"finding":"The Mef2c skeletal muscle-specific control region is a direct transcriptional target of myogenic bHLH proteins (e.g., MyoD) and MEF2 proteins themselves; mutagenesis showed the E-box (bHLH binding site) is essential for initiation of Mef2c transcription, while the adjacent MEF2 site is required for maintenance, establishing a positive autoregulatory loop.","method":"Transgenic reporter (lacZ) mice, in vivo mutagenesis of the Mef2c enhancer, EMSA","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo transgenic reporter combined with mutagenesis; replicated across multiple constructs and developmental stages","pmids":["11714687"],"is_preprint":false},{"year":2001,"finding":"MEF2C directly interacts with SOX18 in endothelial cell nuclei; MEF2C potentiates SOX18-mediated transcription and regulates the SOX18 activation domain, but fails to interact with or co-activate transcription with the disease-causing Ra or RaJ mutant SOX18 proteins.","method":"Co-immunoprecipitation, co-expression transcriptional activation assays in cell culture, in vivo co-localization in endothelial cell nuclei","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal protein interaction confirmed by Co-IP and functional co-activation assay in single lab","pmids":["11554755"],"is_preprint":false},{"year":2004,"finding":"MEF2C activates the alphaT-catenin (CTNNA3) promoter in cardiac cells; co-transfection studies and in vivo transgenic reporter analysis established MEF2C as a regulator of tissue-specific CTNNA3 expression.","method":"Co-transfection reporter assays in P19 cells, promoter mutant analysis in HL-1 cardiac cells, transgenic mice with LacZ reporter","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic validation combined with promoter mutagenesis, single lab","pmids":["15302915"],"is_preprint":false},{"year":2005,"finding":"MEF2C DNA-binding activity is inhibited through direct interaction with the regulatory protein Ki-1/57; under pressure overload Ki-1/57 exits the nucleus, reducing this co-localization and de-repressing MEF2C.","method":"Yeast two-hybrid, GST pull-down (in vitro), co-immunoprecipitation (in vivo), EMSA, immunofluorescence co-localization in rat myocytes","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interaction confirmed by multiple orthogonal biochemical methods; functional inhibition of DNA binding shown by EMSA; single lab","pmids":["15862299"],"is_preprint":false},{"year":2005,"finding":"ERK5 activates MEF2C in insulin-stimulated pre-adipocytes; ERK5 siRNA inhibited MEF2C activation, and dominant-negative FTase blocked ERK5 nuclear translocation and MEF2C activation, demonstrating an ERK5→MEF2C axis downstream of prenylation in adipogenesis.","method":"siRNA knockdown of ERK5, dominant-negative FTase overexpression, MEF2C activation assays in pre-adipocyte cells","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with defined transcriptional readout; single lab, single cell type","pmids":["16356629"],"is_preprint":false},{"year":2007,"finding":"MEF2C controls chondrocyte hypertrophy and endochondral bone development; endochondral bone formation is exquisitely sensitive to the balance between MEF2C and the corepressor HDAC4, such that Hdac4 mutation rescues bone deficiency of Mef2c mutant mice, and a heterozygous Mef2c mutation diminishes ectopic ossification in Hdac4-null mice.","method":"Conditional/dominant-negative/superactivating MEF2C transgenic mice, genetic epistasis with Hdac4 knockout, histology, molecular marker analysis","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous in vivo genetic epistasis with multiple alleles (loss-of-function, dominant-negative, superactivating) in the same study; independently replicated in chondrocyte and bone contexts","pmids":["17336904"],"is_preprint":false},{"year":2007,"finding":"MEF2C binds the MEF2 sites in the CARK (TNNI3K) promoter and is an essential positive regulator of CARK cardiac-specific transcription, as demonstrated by EMSA supershift and MEF2C antisense downregulation of CARK.","method":"Truncation/mutation analysis of CARK promoter, EMSA with supershift, co-transfection, MEF2C antisense in cardiac cells","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct DNA binding confirmed by EMSA and ChIP-equivalent supershift; loss-of-function by antisense; single lab","pmids":["18021318"],"is_preprint":false},{"year":2008,"finding":"p38 MAPK directly phosphorylates MEF2C via three residues in the C-terminal transactivation domain in B cells downstream of BCR stimulation; conditional Mef2c deletion in B cells resulted in severe defects in B-cell proliferation, reduced immune response, and defective germinal center formation.","method":"Conditional B-cell-specific Mef2c knockout mice, p38 phosphorylation mapping of MEF2C, in vitro and in vivo immune response assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct phosphorylation site mapping plus conditional in vivo knockout with defined immune phenotype; consistent with parallel study (PMID 18438409)","pmids":["18955699"],"is_preprint":false},{"year":2008,"finding":"Calcineurin-regulated MEF2C is required for BCR-induced B-cell proliferation and survival; loss of Mef2c caused defects in proliferation and survival after BCR (but not TLR or CD40) stimulation, and MEF2C-dependent targets include cyclin D2 and Bcl-xL.","method":"Conditional Mef2c knockout in B cells, BCR stimulation proliferation/survival assays, target gene expression analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional knockout with defined proliferation/survival phenotype and identified downstream targets; consistent with PMID 18955699","pmids":["18438409"],"is_preprint":false},{"year":2008,"finding":"Nkx2.5 and MEF2C directly interact via co-immunoprecipitation and mammalian two-hybrid; genetic interaction studies show Nkx2.5−/−;Mef2c−/− double mutants lack identifiable ventricles due to defective ventricular cell differentiation, demonstrating cooperative requirement for ventricular formation.","method":"Co-immunoprecipitation, mammalian two-hybrid, double-knockout mouse genetics, histology and molecular marker analysis","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein interaction confirmed by two orthogonal methods, plus in vivo genetic epistasis in double-mutant mice","pmids":["19035347"],"is_preprint":false},{"year":2009,"finding":"Mef2c is a direct downstream target of Scl/Tal1 in megakaryocytic cells (confirmed by ChIP-microarray hybridization); Mef2c deficiency impairs megakaryopoiesis and platelet function (reduced counts, increased size, altered shape/granularity), and Mef2c is also required for B-lymphoid homeostasis.","method":"Conditional Mef2c knockout (VavCre), ChIP-chip analysis, platelet phenotyping, in vitro megakaryopoiesis assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ChIP evidence for Scl binding Mef2c locus combined with conditional in vivo knockout showing defined hematopoietic phenotypes","pmids":["19211936"],"is_preprint":false},{"year":2009,"finding":"MEF2C overexpression in cooperation with Irf8 deficiency induces myelomonocytic leukemia; conditional Mef2c deletion in MLL/ENL leukemia cells does not impair LSC establishment but compromises homing and invasiveness, with MEF2C-dependent targets including matrix metalloproteinases and chemokine ligands/receptors.","method":"Retroviral overexpression, conditional knockout mouse model, gene expression analysis of MEF2C targets","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional in vivo knockout with defined homing/invasiveness phenotype and identified transcriptional targets; single lab but multiple genetic models","pmids":["19584403"],"is_preprint":false},{"year":2009,"finding":"Foxj3 transcriptionally activates Mef2c through a conserved forkhead binding site in the Mef2c skeletal muscle enhancer; Foxj3 mutant mice have fewer Type I slow-twitch myofibers, impaired muscle function, and decreased Mef2c expression.","method":"Foxj3 knockout mice, transcriptional reporter assays in C2C12 cells, EMSA/ChIP for Foxj3 binding at Mef2c enhancer","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout phenotype plus direct binding to Mef2c enhancer by EMSA/reporter; single lab","pmids":["19914232"],"is_preprint":false},{"year":2011,"finding":"Gli2 and MEF2C directly interact (co-IP) and bind each other's regulatory elements (ChIP) in differentiating P19 cells, activating each other's expression and synergizing on cardiomyogenesis-related promoters containing Gli- and MEF2-binding elements.","method":"Co-immunoprecipitation, ChIP, dominant-negative mutant analysis, transcriptional reporter assays in P19 cells","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal ChIP and Co-IP with functional reporter validation; single lab","pmids":["22199256"],"is_preprint":false},{"year":2012,"finding":"Notch3 inhibits Mef2c activity most likely by increasing the p38 phosphatase Mkp1 (which inhibits the Mef2c-activating p38 MAP kinase); conversely, Mef2c induces miR-1 and miR-206, which directly downregulate Notch3, forming a mutual antagonism circuit during myoblast differentiation.","method":"Overexpression/knockdown in differentiating myoblasts, luciferase reporter assays, p38 pathway analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined signaling pathway placement with Mkp1 as intermediary and miRNA-mediated feedback; single lab","pmids":["23055528"],"is_preprint":false},{"year":2012,"finding":"Tbx1 is a negative modulator of Mef2c: Tbx1 occupies conserved regulatory regions of the Mef2c locus (suggesting direct transcriptional repression) and also interferes with the Gata4→Mef2c regulatory pathway; Mef2c is upregulated in the second heart field of Tbx1 null embryos and decreased in Tbx1 gain-of-function embryos.","method":"Microarray transcriptomics across Tbx1 allelic series, ChIP for Tbx1 at Mef2c locus, in vivo immunostaining","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP evidence for direct Tbx1 occupancy at Mef2c regulatory regions; in vivo allelic series; single lab","pmids":["22367967"],"is_preprint":false},{"year":2013,"finding":"Mef2c binds two conserved MEF2 sites in the Crtl1 5' flanking region in vivo during cardiovascular development, and Mef2c expression is required for Crtl1 transcription in fetal mitral valve interstitial cells.","method":"ChIP, MEF2 binding site mutagenesis, loss-of-function in VICs","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP combined with loss-of-function in primary cells; single lab","pmids":["23468913"],"is_preprint":false},{"year":2015,"finding":"HDAC5 binds and inhibits MEF2C in osteocytes; ChIP mapped endogenous MEF2C binding to a distal SOST enhancer 45 kb downstream of the TSS; HDAC5 deficiency increases MEF2C chromatin association, H3K27ac, and SOST expression, while HDAC5 overexpression decreases SOST. MEF2C knockdown abolishes the HDAC5-shRNA-induced increase in sclerostin, confirming MEF2C is the key HDAC5 target for SOST regulation.","method":"HDAC5 shRNA and overexpression in osteocytic cells, HDAC5 knockout mice, ChIP for MEF2C/HDAC5/H3K27ac at SOST enhancer, co-IP, double knockdown rescue experiments","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (ChIP, Co-IP, KO mice, double-KD rescue) in osteocyte-specific context; single lab but rigorous","pmids":["25271055"],"is_preprint":false},{"year":2015,"finding":"MEF2C degradation during mitosis requires the Anaphase Promoting Complex/Cyclosome (APC/C); this mechanism requires a D-box (R-X-X-L) and two phospho-motifs (pSer98 and pSer110) on MEF2C, mediated through interaction with APC/C co-activator CDC20; both D-box and pSer110 are encoded by the ubiquitous alternate α1 exon.","method":"Cell cycle synchronization, proteasome inhibition, D-box and phospho-site mutagenesis, co-immunoprecipitation with CDC20, cell cycle progression assays","journal":"Cell cycle","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of specific degradation motifs combined with co-IP with CDC20; mechanistic dissection of a novel PTM-dependent degradation pathway; single lab","pmids":["25789873"],"is_preprint":false},{"year":2015,"finding":"MEF2C suppresses endothelial cell inflammation by inhibiting NF-κB activation and inducing KLF2; MEF2C knockdown upregulated pro-inflammatory molecules and stimulated leukocyte adhesion, while MEF2C overexpression repressed TNF-α-induced NF-κB and inflammatory responses; endothelial-specific MEF2C ablation in mice increased LPS-induced leukocyte adhesion to the retinal vasculature.","method":"shRNA knockdown and adenovirus-mediated overexpression in endothelial cells, endothelial-specific conditional knockout mice, leukocyte adhesion assays","journal":"Journal of cellular physiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — consistent findings across in vitro gain/loss-of-function and in vivo conditional knockout with defined molecular mechanism (NF-κB, KLF2)","pmids":["25474999"],"is_preprint":false},{"year":2015,"finding":"Endothelin signaling activates Mef2c expression in the neural crest through a conserved enhancer; CRISPR deletion of this neural crest Mef2c enhancer abolishes Endothelin induction; mechanistically, Endothelin de-represses MEF2C via a Calmodulin-CaMKII-HDAC cascade, and MEF2C participates in a positive-feedback loop to maintain its own expression.","method":"CRISPR enhancer deletion in mice, transgenic reporter analysis, CaMKII/HDAC pathway manipulation, neural crest-specific conditional approaches","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — CRISPR in vivo enhancer deletion with mechanistic dissection of Calmodulin-CaMKII-HDAC cascade; multiple orthogonal methods in single study","pmids":["26160899"],"is_preprint":false},{"year":2016,"finding":"MEF2C functions as a cell-autonomous transcriptional repressor in cortical excitatory neurons; conditional embryonic deletion in Emx1-lineage neurons causes a dramatic increase in inhibitory and decrease in excitatory synaptic transmission, increased inhibitory synapse density and decreased excitatory synapse density, and autism/ID-like behaviors.","method":"Conditional Mef2c knockout (Emx1-Cre), in vivo EEG/electrophysiology, synapse density morphology, behavior assays, differential gene expression analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous cell-type-specific conditional knockout with defined electrophysiological, morphological, and behavioral phenotypes; multiple orthogonal readouts","pmids":["27779093"],"is_preprint":false},{"year":2016,"finding":"MEF2C co-regulates B cell-specific transcription with EBF1; MEF2C and EBF1 co-occupy a subset of B cell-specific gene loci genome-wide; p38 MAPK activates MEF2C to drive B cell differentiation; MEF2C interacts with HDAC7 to repress the myeloid transcription program.","method":"Genome-wide ChIP-seq for MEF2C and EBF1, Mef2c knockout mice, co-immunoprecipitation with HDAC7, gene expression analysis","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP-seq combined with KO mice and direct Co-IP with HDAC7; multiple orthogonal methods","pmids":["26900922"],"is_preprint":false},{"year":2016,"finding":"G9a (lysine methyltransferase) inhibits MEF2C transcriptional activity by interacting with MEF2C and its co-repressor HDAC5; in the presence of G9a, calcium signaling-dependent phosphorylation and nuclear export of HDAC5 is blocked, leading to enhanced MEF2C–HDAC5 association and repression of sarcomere gene expression.","method":"Co-immunoprecipitation (G9a with MEF2C and HDAC5), HDAC5 nuclear export assays, constitutively active CaMK rescue, sarcomere gene expression analysis","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction and functional rescue by CaMK overexpression; single lab with multiple orthogonal approaches","pmids":["27667720"],"is_preprint":false},{"year":2016,"finding":"MEF2C in postnatal excitatory layer 2/3 neocortical neurons differentially regulates local versus long-range excitatory synaptic inputs in an experience-dependent manner; cell-autonomous postsynaptic deletion suppressed local excitatory connections while promoting contralateral neocortical inputs, both requiring normal whisking experience.","method":"Sparse postnatal conditional Mef2c deletion, in vivo electrophysiology/optogenetics, whisker deprivation","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-autonomous sparse deletion with circuit-specific electrophysiological readouts and sensory-deprivation dissection; single lab but rigorous","pmids":["27989458"],"is_preprint":false},{"year":2016,"finding":"MEF2C identifies and directly activates Tdgf1 (Cripto/Nodal co-receptor) transcription through an AHF-restricted enhancer in the outflow tract; loss of Mef2c in the anterior second heart field causes outflow tract alignment defects ranging from overriding aorta to dextro-transposition.","method":"Conditional Mef2c knockout in AHF (Isl1-Cre), transgenic enhancer reporter analysis, ChIP for MEF2C at Tdgf1 AHF enhancer","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO combined with ChIP and transgenic enhancer validation of a direct MEF2C target gene","pmids":["26811383"],"is_preprint":false},{"year":2017,"finding":"HuR (RNA-binding protein) stabilizes MEF2C mRNA by binding it (RIP assay), increasing MEF2C protein levels; elevated MEF2C then enhances SCN5A transcription by binding a MEF2C site in the SCN5A promoter (confirmed by ChIP and EMSA); MEF2C siRNA attenuates HuR-induced SCN5A upregulation.","method":"RIP assay, ChIP-qPCR, EMSA, siRNA knockdown, overexpression in cardiomyocytes","journal":"Journal of the American Heart Association","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding confirmed by RIP and EMSA/ChIP; loss-of-function siRNA rescue; single lab","pmids":["29678826"],"is_preprint":false},{"year":2017,"finding":"NOTCH1 intracellular domain upregulates SNAIL1 expression in embryonal rhabdomyosarcoma, which suppresses MEF2C (a myogenic differentiation transcription factor), enabling de-differentiation into self-renewing myf5+ tumor-propagating cells.","method":"Zebrafish transgenic ERMS model, human ERMS cell overexpression/knockdown, tumor propagation assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined pathway (ICN1→SNAIL1→MEF2C suppression) validated in both zebrafish and human ERMS models; single lab","pmids":["28614716"],"is_preprint":false},{"year":2018,"finding":"MEF2C S222 phosphorylation (induced by MARK kinases) is required for leukemia stem cell maintenance; Mef2c knock-in mice blocking MEF2C S222 phosphorylation were resistant to MLL-AF9-induced leukemogenesis; MARK/SIK inhibitor MRT199665 caused apoptosis and chemosensitivity in MEF2C-phosphorylated AML.","method":"Functional proteomics of patient AML, Mef2c S222A knock-in mice, MARK kinase inhibitor treatment, AML cell line and primary patient specimen assays","journal":"Cancer discovery","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — specific phosphorylation site identified by proteomics, validated by knock-in mouse genetics and pharmacological inhibition; patient specimen validation","pmids":["29431698"],"is_preprint":false},{"year":2018,"finding":"LKB1 and Salt-Inducible Kinases (SIK3, with partial redundancy from SIK2) maintain MEF2C function in AML through phosphorylation of HDAC4 (a repressive cofactor of MEF2C); targeting LKB1 or SIK3 diminishes histone acetylation at MEF2C-bound enhancers; chemical SIK inhibition blocks MEF2C function.","method":"Domain-focused CRISPR screen, genetic validation of LKB1/SIK3/HDAC4 pathway, ChIP-seq for histone acetylation at MEF2C enhancers, SIK inhibitor treatment of AML cells","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screen mechanistically validated with epistasis (HDAC4 as SIK3 substrate) and ChIP-seq; multiple orthogonal methods in single study","pmids":["29526696"],"is_preprint":false},{"year":2018,"finding":"Lipin1 regulates MEF2c expression via the PKCμ/HDAC5 pathway; lipin1 deficiency suppresses PKC isoform activity and HDAC5 nuclear export, thereby blocking MEF2c and MyoD expression; restoration of diacylglycerol signaling by PMA transiently restored HDAC5 export and MEF2c expression.","method":"Myf5-cre conditional Lipin1 knockout mice, phorbol ester rescue, HDAC5 nuclear export imaging, gene expression analysis","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional in vivo KO with pharmacological rescue identifying PKCμ/HDAC5 as intermediaries; single lab","pmids":["30511745"],"is_preprint":false},{"year":2018,"finding":"Cardiovascular development and lethality depend on MEF2C function specifically in the early myocardial lineage (Nkx2-5Cre deletion recapitulates global knockout phenotype), but early endothelial-specific deletion (Etv2::Cre) has no overt vascular defects, demonstrating that MEF2C's vascular requirement is secondary to its cardiac requirement.","method":"Lineage-specific conditional Mef2c knockout using Nkx2-5Cre and Etv2::Cre; histological and molecular phenotyping","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent conditional knockout alleles with early and precise Cre lines definitively resolving cell-lineage requirements; single lab but rigorous experimental design","pmids":["30521808"],"is_preprint":false},{"year":2019,"finding":"MEF2C binds to FOS regulatory regions to directly induce c-FOS expression, which leads to NFATc1 activation and downstream osteoclastogenesis; MEF2C is a positive regulator of osteoclast differentiation, and inducible Mef2c deletion in mice increased bone mass and protected against bone erosion in inflammatory arthritis.","method":"ChIP for MEF2C at FOS promoter, ectopic MEF2C expression, inducible Mef2c conditional knockout mice, K/BxN serum arthritis model, transcriptomics","journal":"Bone research","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct ChIP evidence combined with conditional in vivo KO and disease model; defined transcriptional mechanism (MEF2C→c-FOS→NFATc1)","pmids":["33424022"],"is_preprint":false},{"year":2019,"finding":"MEF2C directly binds the Gpx4 promoter and activates GPX4 transcription, thereby suppressing ferroptosis; MEF2C overexpression ameliorated postoperative cognitive dysfunction in mice by inhibiting lipid peroxidation and iron accumulation through GPX4.","method":"Dual-luciferase reporter assay, ChIP for MEF2C at Gpx4 promoter, AAV9-mediated MEF2C overexpression in POCD mouse model, RSL3 GPX4 inhibitor rescue experiments","journal":"CNS neuroscience & therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase; in vivo rescue with GPX4 inhibitor; single lab","pmids":["39350345"],"is_preprint":false},{"year":2020,"finding":"MEF2C haploinsufficiency syndrome-associated missense mutations cluster in the conserved DNA-binding domain and disrupt MEF2C DNA binding; DNA binding-deficient global Mef2c heterozygous mice display MCHS-related behaviors; MEF2C in forebrain excitatory neurons controls excitatory synaptic transmission while MEF2C in microglia controls social and repetitive behavior.","method":"Structural/functional analysis of patient mutations, conditional heterozygous Mef2c knockout in excitatory neurons and microglia, electrophysiology, behavior assays, cortical RNA-seq","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional knockouts with defined electrophysiological and behavioral phenotypes; mutation functional validation; multiple orthogonal methods","pmids":["32418612"],"is_preprint":false},{"year":2020,"finding":"MEF2C function in postnatal excitatory forebrain neurons is required for sleep-loss-regulated gene expression, the increase and recovery of synaptic strength, and the rebound and resolution of slow-wave sleep slow-wave activity; sleep loss regulates MEF2C phosphorylation as a key mechanism of MEF2C transcriptional activity.","method":"Conditional Mef2c knockout in postnatal excitatory forebrain neurons, EEG/SWA measurement, synaptic strength assays, phospho-MEF2C analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional in vivo knockout with defined electrophysiological (SWA) and molecular (MEF2C phosphorylation) readouts; single lab but rigorous","pmids":["32851972"],"is_preprint":false},{"year":2020,"finding":"GluN3A NMDAR subunit knockdown promotes p38 MAPK nuclear accumulation, which activates MEF2C and drives transcription of MEF2C-dependent synaptic activity-regulated genes (Bdnf, Arc) in developing hippocampal neurons.","method":"GluN3A shRNA knockdown in rat hippocampal neurons, reporter gene assays, RNA-Seq, pharmacological p38 inhibition, two-photon calcium imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined pathway (GluN3A→p38→MEF2C→target genes) with pharmacological and genetic validation; single lab","pmids":["32393578"],"is_preprint":false},{"year":2021,"finding":"MEF2C directly drives transcription of NF2 and CDH1 (E-cadherin) as shown by luciferase reporter assay and ChIP in meningioma cells; MEF2C silencing downregulates NF2 and E-cadherin, enhancing ferroptosis susceptibility, which is counteracted by forced re-expression of NF2 or E-cadherin.","method":"Luciferase reporter assay, ChIP, siRNA knockdown, forced expression rescue, xenograft mouse model","journal":"Neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ChIP and reporter assay evidence for MEF2C binding NF2/CDH1 promoters; rescue experiments in vitro and in vivo; single lab","pmids":["33984142"],"is_preprint":false},{"year":2021,"finding":"MEF2C directly promotes expression of IL-12 p35 (Il12a) and IL-12 p40 (Il12b) subunits to drive M1 macrophage polarization and Th1 responses; myeloid-specific Mef2c-knockout mice showed reduced IL-12 production, impaired Th1 responses, susceptibility to Listeria infection, and protection against DSS-induced IBD.","method":"Myeloid-specific Mef2c conditional knockout mice, ChIP/reporter assays for MEF2C at Il12a/Il12b, infection and colitis models, global gene expression analysis","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional in vivo KO with defined immune phenotypes plus direct transcriptional mechanism (MEF2C binding Il12a/Il12b); single lab","pmids":["35194174"],"is_preprint":false},{"year":2022,"finding":"MEF2C is required for an IL-2- and IL-15-mediated increase in lipid content in NK cells through regulation of SREBP pathways; MEF2C-haploinsufficient patients and mice displayed defects in NK cell development and cytotoxic function; oleic acid supplementation restored cytotoxic function in MEF2C-deficient NK cells.","method":"Non-viral CRISPR-Cas9 KO screen (31 TFs), MEF2C-haploinsufficient patient NK cell analysis, lipid content measurement, SREBP pathway analysis, oleic acid rescue","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR screen validated in patient cells; defined mechanism (MEF2C→SREBP→lipid metabolism) with metabolic rescue; human and mouse evidence","pmids":["38589619"],"is_preprint":false},{"year":2022,"finding":"MEF2C opposes Notch-induced T cell differentiation and promotes a B-lineage transcriptional program (including RUNX1, GATA3, LMO2, BCL2, IL-7R upregulation) in ETP-ALL; SIK inhibitors impair MEF2C activity and alleviate the T cell developmental block caused by elevated MEF2C.","method":"In vivo and in vitro ETP-ALL models, conditional MEF2C overexpression in mouse/human progenitors, SIK inhibitor treatment, gene expression analysis","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined transcriptional targets and pharmacological pathway validation; single lab","pmids":["35536646"],"is_preprint":false},{"year":2022,"finding":"METTL3-mediated m6A methylation of MEF2C mRNA promotes MEF2C protein expression in an m6A-YTHDF1-dependent manner during skeletal myoblast differentiation; MEF2C with mutated m6A sites inhibited myoblast differentiation; MEF2C promotes METTL3 expression by binding to the METTL3 promoter, forming a positive feedback loop.","method":"m6A-site mutagenesis of MEF2C mRNA, YTHDF1 knockdown, METTL3 knockdown/overexpression, ChIP for MEF2C at METTL3 promoter, myoblast differentiation assays","journal":"Frontiers in veterinary science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A site mutagenesis with YTHDF1 reader validation and reciprocal ChIP; single lab","pmids":["35573410"],"is_preprint":false},{"year":2023,"finding":"Activated MEF2C recruits p300 and multiple cardiogenic transcription factors to cardiac loci to induce chromatin remodeling during cardiomyocyte reprogramming; p300 inhibition suppressed cardiac gene expression and iCM maturation; MEF2C acts as a pioneer factor in this process.","method":"MyoD transactivation domain fusion to MEF2C, p300 inhibitor treatment, ChIP-seq for MEF2C and p300 at cardiac loci, beating iCM quantification","journal":"Stem cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq for MEF2C/p300 recruitment combined with pharmacological inhibition; single lab","pmids":["37315521"],"is_preprint":false},{"year":2023,"finding":"Pathological tau activates cGAS-IFN-I signaling in microglia (partly via cytosolic mitochondrial DNA leakage), which decreases the neuronal MEF2C transcriptional network; cGAS ablation preserved MEF2C expression network, synapse integrity and plasticity; pharmacological cGAS inhibition enhanced the neuronal MEF2C network and restored memory.","method":"Cgas conditional knockout in tauopathy mice, microglial IFN-I response measurement, synaptic integrity assays, behavioral testing, transcriptomic analysis of MEF2C network","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic ablation of cGAS in vivo combined with pharmacological inhibition and defined molecular mechanism (cGAS→IFN-I→↓MEF2C network); multiple orthogonal readouts","pmids":["37095396"],"is_preprint":false},{"year":2024,"finding":"Loss of MEF2C from parvalbumin-expressing interneurons (PV-INs) during embryonic (but not late postnatal) development results in reduced PV-IN number, failure of PV-INs to molecularly and synaptically mature, abnormal cortical network activity, hyperactivity, stereotypy, and impaired cognitive/social behavior.","method":"Conditional Mef2c deletion in PV-INs at embryonic vs. postnatal timepoints, slice electrophysiology, in vivo recordings, behavior assays","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — temporal conditional knockout dissecting a developmental-stage-specific cell-autonomous requirement; multiple electrophysiological and behavioral readouts","pmids":["38848814"],"is_preprint":false},{"year":2019,"finding":"MEF2C binds the CAIII promoter between −416 and −200 bp and activates CAIII transcription in response to [Ca2+]i changes; CaMKII is the key upstream kinase activating MEF2C in this Ca2+-CaMKII-MEF2C pathway regulating CAIII expression in skeletal muscle.","method":"ChIP, luciferase promoter assay, RNA interference, MEF2C overexpression, CaMKII inhibitor/activator experiments in skeletal muscle cells","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct MEF2C binding to CAIII promoter by ChIP and luciferase, CaMKII-pathway validation; single lab","pmids":["31614133"],"is_preprint":false},{"year":2019,"finding":"MEF2C activates the MYC super-enhancer (525ESE) in EBV-transformed lymphoblastoid cells; MEF2C depletion decreased 525ESE reporter activity, MYC expression, LCL growth, and IRF4/EBNA2/SPI1 binding to 525ESE; MEF2C cDNA resistant to CRISPR rescued reporter activity and MYC expression.","method":"Genome-wide CRISPR screen, MEF2C CRISPR knockout, rescue with MEF2C cDNA, luciferase reporter assay, ChIP for transcription factor binding at 525ESE","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen validated by rescue with MEF2C cDNA and ChIP; multiple orthogonal methods identifying MEF2C as essential for MYC SE activity","pmids":["31167905"],"is_preprint":false},{"year":2020,"finding":"MEF2C splicing variant γ+ (transrepressor isoform) is upregulated in human and mouse failing hearts; MEF2Cγ+ overexpression drives incomplete cell-cycle re-entry, partial dedifferentiation and apoptosis in cardiomyocytes, and causes dilated cardiomyopathy in transgenic mice, while MEF2Cγ- overexpression does not produce these effects.","method":"Adenoviral MEF2C isoform overexpression in rat cardiomyocytes, transgenic mice with cardiac-specific MEF2Cγ+/γ-, confocal/electron microscopy, flow cytometry, DNA microarray, heart failure patient samples","journal":"EBioMedicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific in vitro and in vivo overexpression with inactive-mutant control; human failing heart validation; multiple phenotypic readouts","pmids":["31911274"],"is_preprint":false}],"current_model":"MEF2C is a MADS-box transcription factor that integrates multiple upstream kinase signals (p38 MAPK, CaMKII, MARK/SIK, ERK5) via direct phosphorylation of its transactivation domain, and is regulated by class IIa HDACs (HDAC4/5) and co-activators (p300), to control transcriptional programs in muscle (skeletal, cardiac, smooth), bone (osteoclast, osteocyte, chondrocyte), immune (B cell, macrophage, NK cell), and neuronal cell types, with its activity modulated by degradation via APC/C-CDC20, interaction with repressors (Ki-1/57, G9a), and m6A-dependent mRNA stabilization."},"narrative":{"mechanistic_narrative":"MEF2C is a MADS-box transcription factor that establishes and maintains cell-type-specific gene programs across muscle, cardiovascular, skeletal, hematopoietic/immune, and neuronal lineages, acting as a signal-integrating node downstream of multiple kinase cascades [PMID:9988769, PMID:18955699, PMID:29431698]. Its activity is gated by direct phosphorylation: p38 MAPK phosphorylates three residues in the C-terminal transactivation domain to drive skeletal myogenesis and B-cell differentiation [PMID:9988769, PMID:18955699], CaMKII and ERK5 transduce calcium and growth-factor signals [PMID:16356629, PMID:31614133], and MARK/SIK kinases phosphorylate Ser222 and relieve HDAC4-mediated repression to sustain MEF2C output in leukemia [PMID:29431698, PMID:29526696]. MEF2C is held in check by class IIa histone deacetylases (HDAC4, HDAC5, HDAC7) whose calcium-dependent nuclear export releases MEF2C, and by additional repressors including Ki-1/57 and the methyltransferase G9a [PMID:17336904, PMID:25271055, PMID:26900922, PMID:27667720, PMID:15862299]; activated MEF2C recruits the coactivator p300 and acts as a pioneer factor to remodel chromatin at cardiac loci [PMID:37315521]. Through partnerships with lineage transcription factors (Nkx2.5, EBF1, SOX18, Gli2) and direct binding to dozens of target promoters and enhancers, MEF2C controls ventricular and outflow-tract development [PMID:19035347, PMID:26811383, PMID:30521808], B-lymphopoiesis and myeloid/megakaryocyte fate [PMID:26900922, PMID:19211936, PMID:35194174], osteoclast differentiation via c-FOS/NFATc1 [PMID:33424022], and excitatory and inhibitory cortical circuit assembly [PMID:27779093, PMID:32418612, PMID:38848814]. Its abundance is further tuned by APC/C-CDC20-mediated mitotic degradation requiring a D-box and phospho-degrons and by m6A/HuR-dependent mRNA stabilization [PMID:25789873, PMID:35573410, PMID:29678826]. MEF2C haploinsufficiency, caused by missense mutations in its conserved DNA-binding domain that abolish DNA binding, produces a neurodevelopmental syndrome with autism/intellectual-disability-like phenotypes [PMID:32418612].","teleology":[{"year":1999,"claim":"Established that MEF2C is a downstream effector of a kinase pathway in differentiation, linking p38 MAPK signaling to muscle-specific transcription.","evidence":"p38 inhibition, MKK6/p38 overexpression and MEF2-site reporter assays in fibroblast and myoblast lines","pmids":["9988769"],"confidence":"High","gaps":["Specific phosphoacceptor residues not mapped in this study","Did not address other tissues"]},{"year":2001,"claim":"Defined how Mef2c transcription is initiated and sustained, revealing a bHLH-initiated, MEF2-maintained positive autoregulatory loop in skeletal muscle.","evidence":"Transgenic lacZ reporter mice with enhancer mutagenesis and EMSA","pmids":["11714687"],"confidence":"High","gaps":["Restricted to skeletal muscle enhancer","Other lineage-specific enhancers not examined"]},{"year":2008,"claim":"Mapped the p38 phosphorylation sites on MEF2C and demonstrated an essential cell-autonomous role in adaptive immunity, identifying cyclin D2 and Bcl-xL as proliferative/survival targets downstream of BCR/calcineurin signaling.","evidence":"Conditional B-cell Mef2c knockout mice with phospho-site mapping and BCR stimulation assays","pmids":["18955699","18438409"],"confidence":"High","gaps":["Signal selectivity (BCR vs TLR/CD40) mechanism incompletely defined","Direct vs indirect target relationships not fully resolved"]},{"year":2009,"claim":"Established MEF2C as a node in heart and blood development by demonstrating cooperative protein partnerships (Nkx2.5) and upstream transcriptional control (Scl/Tal1, Foxj3).","evidence":"Co-IP, mammalian two-hybrid, double-knockout and conditional knockout mouse genetics, ChIP-chip","pmids":["19035347","19211936","19914232"],"confidence":"High","gaps":["Direct genomic targets in each lineage only partially catalogued","Mechanism of partner cooperativity at promoters unresolved"]},{"year":2009,"claim":"Implicated MEF2C in leukemic cell behavior, showing it drives homing and invasiveness in MLL-rearranged leukemia rather than initial transformation.","evidence":"Retroviral overexpression and conditional knockout leukemia models with target expression profiling","pmids":["19584403"],"confidence":"High","gaps":["Direct vs indirect regulation of MMP/chemokine targets not dissected"]},{"year":2007,"claim":"Quantified MEF2C activity as the balance point against HDAC4 corepression in skeletal development, using genetic epistasis to show stoichiometric opposition controls endochondral ossification.","evidence":"Multiple MEF2C transgenic alleles crossed with Hdac4 knockout, with histology","pmids":["17336904"],"confidence":"High","gaps":["Chondrocyte target genes not enumerated","Signal controlling HDAC4 in this context not defined"]},{"year":2015,"claim":"Resolved post-translational control of MEF2C abundance, defining an APC/C-CDC20 degradation pathway dependent on a D-box and two phospho-degrons, and a Calmodulin-CaMKII-HDAC enhancer-activation cascade in neural crest.","evidence":"Degron mutagenesis with CDC20 co-IP; CRISPR enhancer deletion and pathway manipulation in mice","pmids":["25789873","26160899"],"confidence":"High","gaps":["Physiological consequence of failed mitotic degradation not established in tissue","Kinase responsible for the APC/C phospho-degrons not identified"]},{"year":2015,"claim":"Demonstrated MEF2C controls SOST/sclerostin in osteocytes via a distal enhancer and acts to suppress endothelial inflammation through NF-κB inhibition and KLF2 induction, broadening its tissue repertoire.","evidence":"ChIP for MEF2C/HDAC5/H3K27ac, HDAC5 knockout mice, endothelial conditional knockout and leukocyte adhesion assays","pmids":["25271055","25474999"],"confidence":"High","gaps":["Direct vs indirect KLF2 regulation not fully resolved","Cross-talk between osteocyte and inflammatory roles unexamined"]},{"year":2016,"claim":"Established MEF2C as a repressor in cortical excitatory neurons that sets the excitatory/inhibitory synaptic balance and as a genome-wide co-regulator with EBF1 in B-cell fate, while defining direct cardiac developmental targets (Tdgf1).","evidence":"Conditional knockouts with electrophysiology/behavior, ChIP-seq with EBF1, HDAC7 co-IP, and AHF-specific enhancer/ChIP analysis","pmids":["27779093","26900922","26811383","27989458"],"confidence":"High","gaps":["How MEF2C switches between activator and repressor modes not mechanistically resolved","Direct neuronal target genes only partially defined"]},{"year":2018,"claim":"Identified phosphorylation-dependent MEF2C activity as a therapeutic dependency in AML, mapping a MARK/LKB1-SIK3-HDAC4 axis that sustains acetylation at MEF2C enhancers and is pharmacologically targetable.","evidence":"S222A knock-in mice, functional proteomics, domain-focused CRISPR screen, ChIP-seq and SIK inhibitor treatment of AML","pmids":["29431698","29526696"],"confidence":"High","gaps":["Full set of phospho-dependent target enhancers not catalogued","Selectivity of SIK inhibition for leukemic vs normal MEF2C function unclear"]},{"year":2018,"claim":"Dissected the cell-lineage origin of MEF2C's cardiovascular requirement, showing the vascular phenotype is secondary to an early myocardial requirement.","evidence":"Nkx2-5Cre vs Etv2::Cre lineage-specific conditional knockouts with phenotyping","pmids":["30521808"],"confidence":"High","gaps":["Myocardial target program driving lethality not fully defined"]},{"year":2020,"claim":"Linked MEF2C DNA-binding-domain mutations to a haploinsufficiency neurodevelopmental syndrome and separated its neuronal versus microglial contributions to distinct behavioral domains.","evidence":"Patient mutation functional analysis with cell-type-specific heterozygous knockouts, electrophysiology, behavior, and RNA-seq","pmids":["32418612"],"confidence":"High","gaps":["Microglial MEF2C target genes underlying behavior not identified","Mechanism of non-cell-autonomous microglial effect unresolved"]},{"year":2020,"claim":"Extended MEF2C function to sleep homeostasis and activity-dependent neuronal gene expression, showing its phosphorylation status couples sleep loss to synaptic strength regulation.","evidence":"Postnatal forebrain conditional knockout with EEG/SWA, synaptic assays, phospho-MEF2C analysis; GluN3A knockdown with p38 pathway analysis","pmids":["32851972","32393578"],"confidence":"High","gaps":["Kinase/phosphatase controlling sleep-regulated MEF2C phosphorylation not pinpointed","Direct sleep-regulated target genes only partly defined"]},{"year":2022,"claim":"Defined metabolic and inflammatory roles for MEF2C: licensing IL-2/IL-15-driven lipid metabolism in NK cells via SREBP, and driving M1 macrophage IL-12 transcription, with direct human haploinsufficiency relevance for NK function.","evidence":"CRISPR knockout screens in NK cells, patient-cell analysis, myeloid-specific knockout mice with infection/colitis models and ChIP/reporter assays","pmids":["38589619","35194174"],"confidence":"High","gaps":["Direct vs indirect SREBP pathway regulation not fully resolved","Whether the same kinase inputs operate in immune cells untested"]},{"year":2023,"claim":"Revealed MEF2C as a pioneer/chromatin-remodeling factor that recruits p300 and cardiogenic factors during cardiomyocyte reprogramming, and connected microglial cGAS-IFN-I signaling to suppression of the neuronal MEF2C network in tauopathy.","evidence":"ChIP-seq for MEF2C/p300 with p300 inhibition in iCM reprogramming; Cgas conditional knockout and inhibition in tauopathy mice","pmids":["37315521","37095396"],"confidence":"High","gaps":["How IFN-I lowers the MEF2C network molecularly not resolved","Pioneer-factor mechanism (nucleosome engagement) not directly demonstrated"]},{"year":2024,"claim":"Established a developmental-stage-specific requirement for MEF2C in parvalbumin interneuron maturation, refining the cellular basis of MEF2C-associated cortical dysfunction.","evidence":"Embryonic vs postnatal conditional Mef2c deletion in PV-INs with slice/in vivo electrophysiology and behavior","pmids":["38848814"],"confidence":"High","gaps":["Target genes driving PV-IN maturation not identified","Why the requirement is temporally restricted unexplained"]},{"year":null,"claim":"It remains unresolved how the same MEF2C molecule is mechanistically switched between transcriptional activation and repression, and how its many upstream kinase and cofactor inputs are integrated into cell-type-specific target selection.","evidence":"No single study in the corpus reconciles the activator/repressor duality or the combinatorial cofactor logic","pmids":[],"confidence":"Low","gaps":["No unified model of activator-to-repressor switching","Genome-wide cofactor occupancy not jointly mapped across cell types","Isoform-specific (e.g. γ+) target codes incompletely defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,8,22,26,33,39,43]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[7,17,18,26,33,35,46]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,4,24]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,8,26,33,39]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,6,10,26,32,45]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,9,23,39,40]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,29,30,37]}],"complexes":[],"partners":["HDAC5","HDAC4","HDAC7","NKX2-5","EBF1","SOX18","GLI2","CDC20"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q06413","full_name":"Myocyte-specific enhancer factor 2C","aliases":["Myocyte enhancer factor 2C"],"length_aa":473,"mass_kda":51.2,"function":"Transcription activator which binds specifically to the MEF2 element present in the regulatory regions of many muscle-specific genes. Controls cardiac morphogenesis and myogenesis, and is also involved in vascular development. Enhances transcriptional activation mediated by SOX18. Plays an essential role in hippocampal-dependent learning and memory by suppressing the number of excitatory synapses and thus regulating basal and evoked synaptic transmission. Crucial for normal neuronal development, distribution, and electrical activity in the neocortex. Necessary for proper development of megakaryocytes and platelets and for bone marrow B-lymphopoiesis. Required for B-cell survival and proliferation in response to BCR stimulation, efficient IgG1 antibody responses to T-cell-dependent antigens and for normal induction of germinal center B-cells. May also be involved in neurogenesis and in the development of cortical architecture (By similarity). Isoforms that lack the repressor domain are more active than isoform 1","subcellular_location":"Nucleus; Cytoplasm, sarcoplasm","url":"https://www.uniprot.org/uniprotkb/Q06413/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MEF2C","classification":"Not Classified","n_dependent_lines":40,"n_total_lines":1208,"dependency_fraction":0.033112582781456956},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MEF2C","total_profiled":1310},"omim":[{"mim_id":"618111","title":"ZINC FINGER PROTEIN 64; ZFP64","url":"https://www.omim.org/entry/618111"},{"mim_id":"616611","title":"LONG INTERGENIC NONCODING RNA 461; LINC00461","url":"https://www.omim.org/entry/616611"},{"mim_id":"614933","title":"LONG INTERGENIC NONCODING RNA, MUSCLE DIFFERENTIATION 1; LINCMD1","url":"https://www.omim.org/entry/614933"},{"mim_id":"614776","title":"SIK FAMILY KINASE 3; SIK3","url":"https://www.omim.org/entry/614776"},{"mim_id":"613443","title":"NEURODEVELOPMENTAL DISORDER WITH HYPOTONIA, STEREOTYPIC HAND MOVEMENTS, AND IMPAIRED LANGUAGE; NEDHSIL","url":"https://www.omim.org/entry/613443"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Vesicles","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":522.1},{"tissue":"tongue","ntpm":231.4}],"url":"https://www.proteinatlas.org/search/MEF2C"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q06413","domains":[{"cath_id":"3.40.1810.10","chopping":"13-74","consensus_level":"high","plddt":97.7632,"start":13,"end":74}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06413","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q06413-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q06413-F1-predicted_aligned_error_v6.png","plddt_mean":55.66},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MEF2C","jax_strain_url":"https://www.jax.org/strain/search?query=MEF2C"},"sequence":{"accession":"Q06413","fasta_url":"https://rest.uniprot.org/uniprotkb/Q06413.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q06413/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q06413"}},"corpus_meta":[{"pmid":"9988769","id":"PMC_9988769","title":"p38 mitogen-activated protein kinase pathway promotes skeletal muscle differentiation. Participation of the Mef2c transcription factor.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9988769","citation_count":378,"is_preprint":false},{"pmid":"17336904","id":"PMC_17336904","title":"MEF2C transcription factor controls chondrocyte hypertrophy and bone development.","date":"2007","source":"Developmental cell","url":"https://pubmed.ncbi.nlm.nih.gov/17336904","citation_count":346,"is_preprint":false},{"pmid":"37095396","id":"PMC_37095396","title":"Tau activation of microglial cGAS-IFN reduces MEF2C-mediated cognitive resilience.","date":"2023","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/37095396","citation_count":218,"is_preprint":false},{"pmid":"25416133","id":"PMC_25416133","title":"Stoichiometry of Gata4, Mef2c, and Tbx5 influences the efficiency and quality of induced cardiac myocyte reprogramming.","date":"2014","source":"Circulation 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England)","url":"https://pubmed.ncbi.nlm.nih.gov/11714687","citation_count":132,"is_preprint":false},{"pmid":"25271055","id":"PMC_25271055","title":"HDAC5 controls MEF2C-driven sclerostin expression in osteocytes.","date":"2015","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/25271055","citation_count":126,"is_preprint":false},{"pmid":"29526696","id":"PMC_29526696","title":"LKB1, Salt-Inducible Kinases, and MEF2C Are Linked Dependencies in Acute Myeloid Leukemia.","date":"2018","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/29526696","citation_count":123,"is_preprint":false},{"pmid":"35194174","id":"PMC_35194174","title":"MEF2C promotes M1 macrophage polarization and Th1 responses.","date":"2022","source":"Cellular & molecular 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meningioma.","date":"2021","source":"Neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33984142","citation_count":67,"is_preprint":false},{"pmid":"19584403","id":"PMC_19584403","title":"Homing and invasiveness of MLL/ENL leukemic cells is regulated by MEF2C.","date":"2009","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/19584403","citation_count":65,"is_preprint":false},{"pmid":"25474999","id":"PMC_25474999","title":"Transcription factor MEF2C suppresses endothelial cell inflammation via regulation of NF-κB and KLF2.","date":"2015","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/25474999","citation_count":63,"is_preprint":false},{"pmid":"28332716","id":"PMC_28332716","title":"miR-124 and miR-9 mediated downregulation of HDAC5 promotes neurite development through activating MEF2C-GPM6A pathway.","date":"2017","source":"Journal of cellular 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inhibition of p38 with SB203580 blocked myoblast fusion and MEF2 family member expression.\",\n      \"method\": \"Pharmacological inhibition (SB203580), overexpression of MKK6/p38, reporter gene assays in 10T1/2 fibroblasts and L8 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (kinase inhibitor, overexpression, reporter assay), replicated across cell types; p38 phosphorylation of MEF2C was already established prior to this study\",\n      \"pmids\": [\"9988769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The Mef2c skeletal muscle-specific control region is a direct transcriptional target of myogenic bHLH proteins (e.g., MyoD) and MEF2 proteins themselves; mutagenesis showed the E-box (bHLH binding site) is essential for initiation of Mef2c transcription, while the adjacent MEF2 site is required for maintenance, establishing a positive autoregulatory loop.\",\n      \"method\": \"Transgenic reporter (lacZ) mice, in vivo mutagenesis of the Mef2c enhancer, EMSA\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo transgenic reporter combined with mutagenesis; replicated across multiple constructs and developmental stages\",\n      \"pmids\": [\"11714687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MEF2C directly interacts with SOX18 in endothelial cell nuclei; MEF2C potentiates SOX18-mediated transcription and regulates the SOX18 activation domain, but fails to interact with or co-activate transcription with the disease-causing Ra or RaJ mutant SOX18 proteins.\",\n      \"method\": \"Co-immunoprecipitation, co-expression transcriptional activation assays in cell culture, in vivo co-localization in endothelial cell nuclei\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal protein interaction confirmed by Co-IP and functional co-activation assay in single lab\",\n      \"pmids\": [\"11554755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MEF2C activates the alphaT-catenin (CTNNA3) promoter in cardiac cells; co-transfection studies and in vivo transgenic reporter analysis established MEF2C as a regulator of tissue-specific CTNNA3 expression.\",\n      \"method\": \"Co-transfection reporter assays in P19 cells, promoter mutant analysis in HL-1 cardiac cells, transgenic mice with LacZ reporter\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic validation combined with promoter mutagenesis, single lab\",\n      \"pmids\": [\"15302915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MEF2C DNA-binding activity is inhibited through direct interaction with the regulatory protein Ki-1/57; under pressure overload Ki-1/57 exits the nucleus, reducing this co-localization and de-repressing MEF2C.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down (in vitro), co-immunoprecipitation (in vivo), EMSA, immunofluorescence co-localization in rat myocytes\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction confirmed by multiple orthogonal biochemical methods; functional inhibition of DNA binding shown by EMSA; single lab\",\n      \"pmids\": [\"15862299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ERK5 activates MEF2C in insulin-stimulated pre-adipocytes; ERK5 siRNA inhibited MEF2C activation, and dominant-negative FTase blocked ERK5 nuclear translocation and MEF2C activation, demonstrating an ERK5→MEF2C axis downstream of prenylation in adipogenesis.\",\n      \"method\": \"siRNA knockdown of ERK5, dominant-negative FTase overexpression, MEF2C activation assays in pre-adipocyte cells\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with defined transcriptional readout; single lab, single cell type\",\n      \"pmids\": [\"16356629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MEF2C controls chondrocyte hypertrophy and endochondral bone development; endochondral bone formation is exquisitely sensitive to the balance between MEF2C and the corepressor HDAC4, such that Hdac4 mutation rescues bone deficiency of Mef2c mutant mice, and a heterozygous Mef2c mutation diminishes ectopic ossification in Hdac4-null mice.\",\n      \"method\": \"Conditional/dominant-negative/superactivating MEF2C transgenic mice, genetic epistasis with Hdac4 knockout, histology, molecular marker analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous in vivo genetic epistasis with multiple alleles (loss-of-function, dominant-negative, superactivating) in the same study; independently replicated in chondrocyte and bone contexts\",\n      \"pmids\": [\"17336904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MEF2C binds the MEF2 sites in the CARK (TNNI3K) promoter and is an essential positive regulator of CARK cardiac-specific transcription, as demonstrated by EMSA supershift and MEF2C antisense downregulation of CARK.\",\n      \"method\": \"Truncation/mutation analysis of CARK promoter, EMSA with supershift, co-transfection, MEF2C antisense in cardiac cells\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct DNA binding confirmed by EMSA and ChIP-equivalent supershift; loss-of-function by antisense; single lab\",\n      \"pmids\": [\"18021318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"p38 MAPK directly phosphorylates MEF2C via three residues in the C-terminal transactivation domain in B cells downstream of BCR stimulation; conditional Mef2c deletion in B cells resulted in severe defects in B-cell proliferation, reduced immune response, and defective germinal center formation.\",\n      \"method\": \"Conditional B-cell-specific Mef2c knockout mice, p38 phosphorylation mapping of MEF2C, in vitro and in vivo immune response assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct phosphorylation site mapping plus conditional in vivo knockout with defined immune phenotype; consistent with parallel study (PMID 18438409)\",\n      \"pmids\": [\"18955699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Calcineurin-regulated MEF2C is required for BCR-induced B-cell proliferation and survival; loss of Mef2c caused defects in proliferation and survival after BCR (but not TLR or CD40) stimulation, and MEF2C-dependent targets include cyclin D2 and Bcl-xL.\",\n      \"method\": \"Conditional Mef2c knockout in B cells, BCR stimulation proliferation/survival assays, target gene expression analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional knockout with defined proliferation/survival phenotype and identified downstream targets; consistent with PMID 18955699\",\n      \"pmids\": [\"18438409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nkx2.5 and MEF2C directly interact via co-immunoprecipitation and mammalian two-hybrid; genetic interaction studies show Nkx2.5−/−;Mef2c−/− double mutants lack identifiable ventricles due to defective ventricular cell differentiation, demonstrating cooperative requirement for ventricular formation.\",\n      \"method\": \"Co-immunoprecipitation, mammalian two-hybrid, double-knockout mouse genetics, histology and molecular marker analysis\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein interaction confirmed by two orthogonal methods, plus in vivo genetic epistasis in double-mutant mice\",\n      \"pmids\": [\"19035347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mef2c is a direct downstream target of Scl/Tal1 in megakaryocytic cells (confirmed by ChIP-microarray hybridization); Mef2c deficiency impairs megakaryopoiesis and platelet function (reduced counts, increased size, altered shape/granularity), and Mef2c is also required for B-lymphoid homeostasis.\",\n      \"method\": \"Conditional Mef2c knockout (VavCre), ChIP-chip analysis, platelet phenotyping, in vitro megakaryopoiesis assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ChIP evidence for Scl binding Mef2c locus combined with conditional in vivo knockout showing defined hematopoietic phenotypes\",\n      \"pmids\": [\"19211936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MEF2C overexpression in cooperation with Irf8 deficiency induces myelomonocytic leukemia; conditional Mef2c deletion in MLL/ENL leukemia cells does not impair LSC establishment but compromises homing and invasiveness, with MEF2C-dependent targets including matrix metalloproteinases and chemokine ligands/receptors.\",\n      \"method\": \"Retroviral overexpression, conditional knockout mouse model, gene expression analysis of MEF2C targets\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional in vivo knockout with defined homing/invasiveness phenotype and identified transcriptional targets; single lab but multiple genetic models\",\n      \"pmids\": [\"19584403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Foxj3 transcriptionally activates Mef2c through a conserved forkhead binding site in the Mef2c skeletal muscle enhancer; Foxj3 mutant mice have fewer Type I slow-twitch myofibers, impaired muscle function, and decreased Mef2c expression.\",\n      \"method\": \"Foxj3 knockout mice, transcriptional reporter assays in C2C12 cells, EMSA/ChIP for Foxj3 binding at Mef2c enhancer\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout phenotype plus direct binding to Mef2c enhancer by EMSA/reporter; single lab\",\n      \"pmids\": [\"19914232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Gli2 and MEF2C directly interact (co-IP) and bind each other's regulatory elements (ChIP) in differentiating P19 cells, activating each other's expression and synergizing on cardiomyogenesis-related promoters containing Gli- and MEF2-binding elements.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, dominant-negative mutant analysis, transcriptional reporter assays in P19 cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal ChIP and Co-IP with functional reporter validation; single lab\",\n      \"pmids\": [\"22199256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Notch3 inhibits Mef2c activity most likely by increasing the p38 phosphatase Mkp1 (which inhibits the Mef2c-activating p38 MAP kinase); conversely, Mef2c induces miR-1 and miR-206, which directly downregulate Notch3, forming a mutual antagonism circuit during myoblast differentiation.\",\n      \"method\": \"Overexpression/knockdown in differentiating myoblasts, luciferase reporter assays, p38 pathway analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined signaling pathway placement with Mkp1 as intermediary and miRNA-mediated feedback; single lab\",\n      \"pmids\": [\"23055528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Tbx1 is a negative modulator of Mef2c: Tbx1 occupies conserved regulatory regions of the Mef2c locus (suggesting direct transcriptional repression) and also interferes with the Gata4→Mef2c regulatory pathway; Mef2c is upregulated in the second heart field of Tbx1 null embryos and decreased in Tbx1 gain-of-function embryos.\",\n      \"method\": \"Microarray transcriptomics across Tbx1 allelic series, ChIP for Tbx1 at Mef2c locus, in vivo immunostaining\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP evidence for direct Tbx1 occupancy at Mef2c regulatory regions; in vivo allelic series; single lab\",\n      \"pmids\": [\"22367967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Mef2c binds two conserved MEF2 sites in the Crtl1 5' flanking region in vivo during cardiovascular development, and Mef2c expression is required for Crtl1 transcription in fetal mitral valve interstitial cells.\",\n      \"method\": \"ChIP, MEF2 binding site mutagenesis, loss-of-function in VICs\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP combined with loss-of-function in primary cells; single lab\",\n      \"pmids\": [\"23468913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HDAC5 binds and inhibits MEF2C in osteocytes; ChIP mapped endogenous MEF2C binding to a distal SOST enhancer 45 kb downstream of the TSS; HDAC5 deficiency increases MEF2C chromatin association, H3K27ac, and SOST expression, while HDAC5 overexpression decreases SOST. MEF2C knockdown abolishes the HDAC5-shRNA-induced increase in sclerostin, confirming MEF2C is the key HDAC5 target for SOST regulation.\",\n      \"method\": \"HDAC5 shRNA and overexpression in osteocytic cells, HDAC5 knockout mice, ChIP for MEF2C/HDAC5/H3K27ac at SOST enhancer, co-IP, double knockdown rescue experiments\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (ChIP, Co-IP, KO mice, double-KD rescue) in osteocyte-specific context; single lab but rigorous\",\n      \"pmids\": [\"25271055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MEF2C degradation during mitosis requires the Anaphase Promoting Complex/Cyclosome (APC/C); this mechanism requires a D-box (R-X-X-L) and two phospho-motifs (pSer98 and pSer110) on MEF2C, mediated through interaction with APC/C co-activator CDC20; both D-box and pSer110 are encoded by the ubiquitous alternate α1 exon.\",\n      \"method\": \"Cell cycle synchronization, proteasome inhibition, D-box and phospho-site mutagenesis, co-immunoprecipitation with CDC20, cell cycle progression assays\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of specific degradation motifs combined with co-IP with CDC20; mechanistic dissection of a novel PTM-dependent degradation pathway; single lab\",\n      \"pmids\": [\"25789873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MEF2C suppresses endothelial cell inflammation by inhibiting NF-κB activation and inducing KLF2; MEF2C knockdown upregulated pro-inflammatory molecules and stimulated leukocyte adhesion, while MEF2C overexpression repressed TNF-α-induced NF-κB and inflammatory responses; endothelial-specific MEF2C ablation in mice increased LPS-induced leukocyte adhesion to the retinal vasculature.\",\n      \"method\": \"shRNA knockdown and adenovirus-mediated overexpression in endothelial cells, endothelial-specific conditional knockout mice, leukocyte adhesion assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — consistent findings across in vitro gain/loss-of-function and in vivo conditional knockout with defined molecular mechanism (NF-κB, KLF2)\",\n      \"pmids\": [\"25474999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Endothelin signaling activates Mef2c expression in the neural crest through a conserved enhancer; CRISPR deletion of this neural crest Mef2c enhancer abolishes Endothelin induction; mechanistically, Endothelin de-represses MEF2C via a Calmodulin-CaMKII-HDAC cascade, and MEF2C participates in a positive-feedback loop to maintain its own expression.\",\n      \"method\": \"CRISPR enhancer deletion in mice, transgenic reporter analysis, CaMKII/HDAC pathway manipulation, neural crest-specific conditional approaches\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — CRISPR in vivo enhancer deletion with mechanistic dissection of Calmodulin-CaMKII-HDAC cascade; multiple orthogonal methods in single study\",\n      \"pmids\": [\"26160899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MEF2C functions as a cell-autonomous transcriptional repressor in cortical excitatory neurons; conditional embryonic deletion in Emx1-lineage neurons causes a dramatic increase in inhibitory and decrease in excitatory synaptic transmission, increased inhibitory synapse density and decreased excitatory synapse density, and autism/ID-like behaviors.\",\n      \"method\": \"Conditional Mef2c knockout (Emx1-Cre), in vivo EEG/electrophysiology, synapse density morphology, behavior assays, differential gene expression analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous cell-type-specific conditional knockout with defined electrophysiological, morphological, and behavioral phenotypes; multiple orthogonal readouts\",\n      \"pmids\": [\"27779093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MEF2C co-regulates B cell-specific transcription with EBF1; MEF2C and EBF1 co-occupy a subset of B cell-specific gene loci genome-wide; p38 MAPK activates MEF2C to drive B cell differentiation; MEF2C interacts with HDAC7 to repress the myeloid transcription program.\",\n      \"method\": \"Genome-wide ChIP-seq for MEF2C and EBF1, Mef2c knockout mice, co-immunoprecipitation with HDAC7, gene expression analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP-seq combined with KO mice and direct Co-IP with HDAC7; multiple orthogonal methods\",\n      \"pmids\": [\"26900922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"G9a (lysine methyltransferase) inhibits MEF2C transcriptional activity by interacting with MEF2C and its co-repressor HDAC5; in the presence of G9a, calcium signaling-dependent phosphorylation and nuclear export of HDAC5 is blocked, leading to enhanced MEF2C–HDAC5 association and repression of sarcomere gene expression.\",\n      \"method\": \"Co-immunoprecipitation (G9a with MEF2C and HDAC5), HDAC5 nuclear export assays, constitutively active CaMK rescue, sarcomere gene expression analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction and functional rescue by CaMK overexpression; single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"27667720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MEF2C in postnatal excitatory layer 2/3 neocortical neurons differentially regulates local versus long-range excitatory synaptic inputs in an experience-dependent manner; cell-autonomous postsynaptic deletion suppressed local excitatory connections while promoting contralateral neocortical inputs, both requiring normal whisking experience.\",\n      \"method\": \"Sparse postnatal conditional Mef2c deletion, in vivo electrophysiology/optogenetics, whisker deprivation\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-autonomous sparse deletion with circuit-specific electrophysiological readouts and sensory-deprivation dissection; single lab but rigorous\",\n      \"pmids\": [\"27989458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MEF2C identifies and directly activates Tdgf1 (Cripto/Nodal co-receptor) transcription through an AHF-restricted enhancer in the outflow tract; loss of Mef2c in the anterior second heart field causes outflow tract alignment defects ranging from overriding aorta to dextro-transposition.\",\n      \"method\": \"Conditional Mef2c knockout in AHF (Isl1-Cre), transgenic enhancer reporter analysis, ChIP for MEF2C at Tdgf1 AHF enhancer\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO combined with ChIP and transgenic enhancer validation of a direct MEF2C target gene\",\n      \"pmids\": [\"26811383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HuR (RNA-binding protein) stabilizes MEF2C mRNA by binding it (RIP assay), increasing MEF2C protein levels; elevated MEF2C then enhances SCN5A transcription by binding a MEF2C site in the SCN5A promoter (confirmed by ChIP and EMSA); MEF2C siRNA attenuates HuR-induced SCN5A upregulation.\",\n      \"method\": \"RIP assay, ChIP-qPCR, EMSA, siRNA knockdown, overexpression in cardiomyocytes\",\n      \"journal\": \"Journal of the American Heart Association\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding confirmed by RIP and EMSA/ChIP; loss-of-function siRNA rescue; single lab\",\n      \"pmids\": [\"29678826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NOTCH1 intracellular domain upregulates SNAIL1 expression in embryonal rhabdomyosarcoma, which suppresses MEF2C (a myogenic differentiation transcription factor), enabling de-differentiation into self-renewing myf5+ tumor-propagating cells.\",\n      \"method\": \"Zebrafish transgenic ERMS model, human ERMS cell overexpression/knockdown, tumor propagation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined pathway (ICN1→SNAIL1→MEF2C suppression) validated in both zebrafish and human ERMS models; single lab\",\n      \"pmids\": [\"28614716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MEF2C S222 phosphorylation (induced by MARK kinases) is required for leukemia stem cell maintenance; Mef2c knock-in mice blocking MEF2C S222 phosphorylation were resistant to MLL-AF9-induced leukemogenesis; MARK/SIK inhibitor MRT199665 caused apoptosis and chemosensitivity in MEF2C-phosphorylated AML.\",\n      \"method\": \"Functional proteomics of patient AML, Mef2c S222A knock-in mice, MARK kinase inhibitor treatment, AML cell line and primary patient specimen assays\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — specific phosphorylation site identified by proteomics, validated by knock-in mouse genetics and pharmacological inhibition; patient specimen validation\",\n      \"pmids\": [\"29431698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LKB1 and Salt-Inducible Kinases (SIK3, with partial redundancy from SIK2) maintain MEF2C function in AML through phosphorylation of HDAC4 (a repressive cofactor of MEF2C); targeting LKB1 or SIK3 diminishes histone acetylation at MEF2C-bound enhancers; chemical SIK inhibition blocks MEF2C function.\",\n      \"method\": \"Domain-focused CRISPR screen, genetic validation of LKB1/SIK3/HDAC4 pathway, ChIP-seq for histone acetylation at MEF2C enhancers, SIK inhibitor treatment of AML cells\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screen mechanistically validated with epistasis (HDAC4 as SIK3 substrate) and ChIP-seq; multiple orthogonal methods in single study\",\n      \"pmids\": [\"29526696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Lipin1 regulates MEF2c expression via the PKCμ/HDAC5 pathway; lipin1 deficiency suppresses PKC isoform activity and HDAC5 nuclear export, thereby blocking MEF2c and MyoD expression; restoration of diacylglycerol signaling by PMA transiently restored HDAC5 export and MEF2c expression.\",\n      \"method\": \"Myf5-cre conditional Lipin1 knockout mice, phorbol ester rescue, HDAC5 nuclear export imaging, gene expression analysis\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional in vivo KO with pharmacological rescue identifying PKCμ/HDAC5 as intermediaries; single lab\",\n      \"pmids\": [\"30511745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cardiovascular development and lethality depend on MEF2C function specifically in the early myocardial lineage (Nkx2-5Cre deletion recapitulates global knockout phenotype), but early endothelial-specific deletion (Etv2::Cre) has no overt vascular defects, demonstrating that MEF2C's vascular requirement is secondary to its cardiac requirement.\",\n      \"method\": \"Lineage-specific conditional Mef2c knockout using Nkx2-5Cre and Etv2::Cre; histological and molecular phenotyping\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent conditional knockout alleles with early and precise Cre lines definitively resolving cell-lineage requirements; single lab but rigorous experimental design\",\n      \"pmids\": [\"30521808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MEF2C binds to FOS regulatory regions to directly induce c-FOS expression, which leads to NFATc1 activation and downstream osteoclastogenesis; MEF2C is a positive regulator of osteoclast differentiation, and inducible Mef2c deletion in mice increased bone mass and protected against bone erosion in inflammatory arthritis.\",\n      \"method\": \"ChIP for MEF2C at FOS promoter, ectopic MEF2C expression, inducible Mef2c conditional knockout mice, K/BxN serum arthritis model, transcriptomics\",\n      \"journal\": \"Bone research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct ChIP evidence combined with conditional in vivo KO and disease model; defined transcriptional mechanism (MEF2C→c-FOS→NFATc1)\",\n      \"pmids\": [\"33424022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MEF2C directly binds the Gpx4 promoter and activates GPX4 transcription, thereby suppressing ferroptosis; MEF2C overexpression ameliorated postoperative cognitive dysfunction in mice by inhibiting lipid peroxidation and iron accumulation through GPX4.\",\n      \"method\": \"Dual-luciferase reporter assay, ChIP for MEF2C at Gpx4 promoter, AAV9-mediated MEF2C overexpression in POCD mouse model, RSL3 GPX4 inhibitor rescue experiments\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding confirmed by ChIP and luciferase; in vivo rescue with GPX4 inhibitor; single lab\",\n      \"pmids\": [\"39350345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MEF2C haploinsufficiency syndrome-associated missense mutations cluster in the conserved DNA-binding domain and disrupt MEF2C DNA binding; DNA binding-deficient global Mef2c heterozygous mice display MCHS-related behaviors; MEF2C in forebrain excitatory neurons controls excitatory synaptic transmission while MEF2C in microglia controls social and repetitive behavior.\",\n      \"method\": \"Structural/functional analysis of patient mutations, conditional heterozygous Mef2c knockout in excitatory neurons and microglia, electrophysiology, behavior assays, cortical RNA-seq\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional knockouts with defined electrophysiological and behavioral phenotypes; mutation functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"32418612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MEF2C function in postnatal excitatory forebrain neurons is required for sleep-loss-regulated gene expression, the increase and recovery of synaptic strength, and the rebound and resolution of slow-wave sleep slow-wave activity; sleep loss regulates MEF2C phosphorylation as a key mechanism of MEF2C transcriptional activity.\",\n      \"method\": \"Conditional Mef2c knockout in postnatal excitatory forebrain neurons, EEG/SWA measurement, synaptic strength assays, phospho-MEF2C analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional in vivo knockout with defined electrophysiological (SWA) and molecular (MEF2C phosphorylation) readouts; single lab but rigorous\",\n      \"pmids\": [\"32851972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GluN3A NMDAR subunit knockdown promotes p38 MAPK nuclear accumulation, which activates MEF2C and drives transcription of MEF2C-dependent synaptic activity-regulated genes (Bdnf, Arc) in developing hippocampal neurons.\",\n      \"method\": \"GluN3A shRNA knockdown in rat hippocampal neurons, reporter gene assays, RNA-Seq, pharmacological p38 inhibition, two-photon calcium imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined pathway (GluN3A→p38→MEF2C→target genes) with pharmacological and genetic validation; single lab\",\n      \"pmids\": [\"32393578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MEF2C directly drives transcription of NF2 and CDH1 (E-cadherin) as shown by luciferase reporter assay and ChIP in meningioma cells; MEF2C silencing downregulates NF2 and E-cadherin, enhancing ferroptosis susceptibility, which is counteracted by forced re-expression of NF2 or E-cadherin.\",\n      \"method\": \"Luciferase reporter assay, ChIP, siRNA knockdown, forced expression rescue, xenograft mouse model\",\n      \"journal\": \"Neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ChIP and reporter assay evidence for MEF2C binding NF2/CDH1 promoters; rescue experiments in vitro and in vivo; single lab\",\n      \"pmids\": [\"33984142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MEF2C directly promotes expression of IL-12 p35 (Il12a) and IL-12 p40 (Il12b) subunits to drive M1 macrophage polarization and Th1 responses; myeloid-specific Mef2c-knockout mice showed reduced IL-12 production, impaired Th1 responses, susceptibility to Listeria infection, and protection against DSS-induced IBD.\",\n      \"method\": \"Myeloid-specific Mef2c conditional knockout mice, ChIP/reporter assays for MEF2C at Il12a/Il12b, infection and colitis models, global gene expression analysis\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional in vivo KO with defined immune phenotypes plus direct transcriptional mechanism (MEF2C binding Il12a/Il12b); single lab\",\n      \"pmids\": [\"35194174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MEF2C is required for an IL-2- and IL-15-mediated increase in lipid content in NK cells through regulation of SREBP pathways; MEF2C-haploinsufficient patients and mice displayed defects in NK cell development and cytotoxic function; oleic acid supplementation restored cytotoxic function in MEF2C-deficient NK cells.\",\n      \"method\": \"Non-viral CRISPR-Cas9 KO screen (31 TFs), MEF2C-haploinsufficient patient NK cell analysis, lipid content measurement, SREBP pathway analysis, oleic acid rescue\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR screen validated in patient cells; defined mechanism (MEF2C→SREBP→lipid metabolism) with metabolic rescue; human and mouse evidence\",\n      \"pmids\": [\"38589619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MEF2C opposes Notch-induced T cell differentiation and promotes a B-lineage transcriptional program (including RUNX1, GATA3, LMO2, BCL2, IL-7R upregulation) in ETP-ALL; SIK inhibitors impair MEF2C activity and alleviate the T cell developmental block caused by elevated MEF2C.\",\n      \"method\": \"In vivo and in vitro ETP-ALL models, conditional MEF2C overexpression in mouse/human progenitors, SIK inhibitor treatment, gene expression analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined transcriptional targets and pharmacological pathway validation; single lab\",\n      \"pmids\": [\"35536646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3-mediated m6A methylation of MEF2C mRNA promotes MEF2C protein expression in an m6A-YTHDF1-dependent manner during skeletal myoblast differentiation; MEF2C with mutated m6A sites inhibited myoblast differentiation; MEF2C promotes METTL3 expression by binding to the METTL3 promoter, forming a positive feedback loop.\",\n      \"method\": \"m6A-site mutagenesis of MEF2C mRNA, YTHDF1 knockdown, METTL3 knockdown/overexpression, ChIP for MEF2C at METTL3 promoter, myoblast differentiation assays\",\n      \"journal\": \"Frontiers in veterinary science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A site mutagenesis with YTHDF1 reader validation and reciprocal ChIP; single lab\",\n      \"pmids\": [\"35573410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Activated MEF2C recruits p300 and multiple cardiogenic transcription factors to cardiac loci to induce chromatin remodeling during cardiomyocyte reprogramming; p300 inhibition suppressed cardiac gene expression and iCM maturation; MEF2C acts as a pioneer factor in this process.\",\n      \"method\": \"MyoD transactivation domain fusion to MEF2C, p300 inhibitor treatment, ChIP-seq for MEF2C and p300 at cardiac loci, beating iCM quantification\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq for MEF2C/p300 recruitment combined with pharmacological inhibition; single lab\",\n      \"pmids\": [\"37315521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pathological tau activates cGAS-IFN-I signaling in microglia (partly via cytosolic mitochondrial DNA leakage), which decreases the neuronal MEF2C transcriptional network; cGAS ablation preserved MEF2C expression network, synapse integrity and plasticity; pharmacological cGAS inhibition enhanced the neuronal MEF2C network and restored memory.\",\n      \"method\": \"Cgas conditional knockout in tauopathy mice, microglial IFN-I response measurement, synaptic integrity assays, behavioral testing, transcriptomic analysis of MEF2C network\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic ablation of cGAS in vivo combined with pharmacological inhibition and defined molecular mechanism (cGAS→IFN-I→↓MEF2C network); multiple orthogonal readouts\",\n      \"pmids\": [\"37095396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of MEF2C from parvalbumin-expressing interneurons (PV-INs) during embryonic (but not late postnatal) development results in reduced PV-IN number, failure of PV-INs to molecularly and synaptically mature, abnormal cortical network activity, hyperactivity, stereotypy, and impaired cognitive/social behavior.\",\n      \"method\": \"Conditional Mef2c deletion in PV-INs at embryonic vs. postnatal timepoints, slice electrophysiology, in vivo recordings, behavior assays\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — temporal conditional knockout dissecting a developmental-stage-specific cell-autonomous requirement; multiple electrophysiological and behavioral readouts\",\n      \"pmids\": [\"38848814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MEF2C binds the CAIII promoter between −416 and −200 bp and activates CAIII transcription in response to [Ca2+]i changes; CaMKII is the key upstream kinase activating MEF2C in this Ca2+-CaMKII-MEF2C pathway regulating CAIII expression in skeletal muscle.\",\n      \"method\": \"ChIP, luciferase promoter assay, RNA interference, MEF2C overexpression, CaMKII inhibitor/activator experiments in skeletal muscle cells\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct MEF2C binding to CAIII promoter by ChIP and luciferase, CaMKII-pathway validation; single lab\",\n      \"pmids\": [\"31614133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MEF2C activates the MYC super-enhancer (525ESE) in EBV-transformed lymphoblastoid cells; MEF2C depletion decreased 525ESE reporter activity, MYC expression, LCL growth, and IRF4/EBNA2/SPI1 binding to 525ESE; MEF2C cDNA resistant to CRISPR rescued reporter activity and MYC expression.\",\n      \"method\": \"Genome-wide CRISPR screen, MEF2C CRISPR knockout, rescue with MEF2C cDNA, luciferase reporter assay, ChIP for transcription factor binding at 525ESE\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen validated by rescue with MEF2C cDNA and ChIP; multiple orthogonal methods identifying MEF2C as essential for MYC SE activity\",\n      \"pmids\": [\"31167905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MEF2C splicing variant γ+ (transrepressor isoform) is upregulated in human and mouse failing hearts; MEF2Cγ+ overexpression drives incomplete cell-cycle re-entry, partial dedifferentiation and apoptosis in cardiomyocytes, and causes dilated cardiomyopathy in transgenic mice, while MEF2Cγ- overexpression does not produce these effects.\",\n      \"method\": \"Adenoviral MEF2C isoform overexpression in rat cardiomyocytes, transgenic mice with cardiac-specific MEF2Cγ+/γ-, confocal/electron microscopy, flow cytometry, DNA microarray, heart failure patient samples\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific in vitro and in vivo overexpression with inactive-mutant control; human failing heart validation; multiple phenotypic readouts\",\n      \"pmids\": [\"31911274\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MEF2C is a MADS-box transcription factor that integrates multiple upstream kinase signals (p38 MAPK, CaMKII, MARK/SIK, ERK5) via direct phosphorylation of its transactivation domain, and is regulated by class IIa HDACs (HDAC4/5) and co-activators (p300), to control transcriptional programs in muscle (skeletal, cardiac, smooth), bone (osteoclast, osteocyte, chondrocyte), immune (B cell, macrophage, NK cell), and neuronal cell types, with its activity modulated by degradation via APC/C-CDC20, interaction with repressors (Ki-1/57, G9a), and m6A-dependent mRNA stabilization.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MEF2C is a MADS-box transcription factor that establishes and maintains cell-type-specific gene programs across muscle, cardiovascular, skeletal, hematopoietic/immune, and neuronal lineages, acting as a signal-integrating node downstream of multiple kinase cascades [#0, #8, #29]. Its activity is gated by direct phosphorylation: p38 MAPK phosphorylates three residues in the C-terminal transactivation domain to drive skeletal myogenesis and B-cell differentiation [#0, #8], CaMKII and ERK5 transduce calcium and growth-factor signals [#5, #46], and MARK/SIK kinases phosphorylate Ser222 and relieve HDAC4-mediated repression to sustain MEF2C output in leukemia [#29, #30]. MEF2C is held in check by class IIa histone deacetylases (HDAC4, HDAC5, HDAC7) whose calcium-dependent nuclear export releases MEF2C, and by additional repressors including Ki-1/57 and the methyltransferase G9a [#6, #18, #23, #24, #4]; activated MEF2C recruits the coactivator p300 and acts as a pioneer factor to remodel chromatin at cardiac loci [#43]. Through partnerships with lineage transcription factors (Nkx2.5, EBF1, SOX18, Gli2) and direct binding to dozens of target promoters and enhancers, MEF2C controls ventricular and outflow-tract development [#10, #26, #32], B-lymphopoiesis and myeloid/megakaryocyte fate [#23, #11, #39], osteoclast differentiation via c-FOS/NFATc1 [#33], and excitatory and inhibitory cortical circuit assembly [#22, #35, #45]. Its abundance is further tuned by APC/C-CDC20-mediated mitotic degradation requiring a D-box and phospho-degrons and by m6A/HuR-dependent mRNA stabilization [#19, #42, #27]. MEF2C haploinsufficiency, caused by missense mutations in its conserved DNA-binding domain that abolish DNA binding, produces a neurodevelopmental syndrome with autism/intellectual-disability-like phenotypes [#35].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that MEF2C is a downstream effector of a kinase pathway in differentiation, linking p38 MAPK signaling to muscle-specific transcription.\",\n      \"evidence\": \"p38 inhibition, MKK6/p38 overexpression and MEF2-site reporter assays in fibroblast and myoblast lines\",\n      \"pmids\": [\"9988769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphoacceptor residues not mapped in this study\", \"Did not address other tissues\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined how Mef2c transcription is initiated and sustained, revealing a bHLH-initiated, MEF2-maintained positive autoregulatory loop in skeletal muscle.\",\n      \"evidence\": \"Transgenic lacZ reporter mice with enhancer mutagenesis and EMSA\",\n      \"pmids\": [\"11714687\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Restricted to skeletal muscle enhancer\", \"Other lineage-specific enhancers not examined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped the p38 phosphorylation sites on MEF2C and demonstrated an essential cell-autonomous role in adaptive immunity, identifying cyclin D2 and Bcl-xL as proliferative/survival targets downstream of BCR/calcineurin signaling.\",\n      \"evidence\": \"Conditional B-cell Mef2c knockout mice with phospho-site mapping and BCR stimulation assays\",\n      \"pmids\": [\"18955699\", \"18438409\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal selectivity (BCR vs TLR/CD40) mechanism incompletely defined\", \"Direct vs indirect target relationships not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established MEF2C as a node in heart and blood development by demonstrating cooperative protein partnerships (Nkx2.5) and upstream transcriptional control (Scl/Tal1, Foxj3).\",\n      \"evidence\": \"Co-IP, mammalian two-hybrid, double-knockout and conditional knockout mouse genetics, ChIP-chip\",\n      \"pmids\": [\"19035347\", \"19211936\", \"19914232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct genomic targets in each lineage only partially catalogued\", \"Mechanism of partner cooperativity at promoters unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Implicated MEF2C in leukemic cell behavior, showing it drives homing and invasiveness in MLL-rearranged leukemia rather than initial transformation.\",\n      \"evidence\": \"Retroviral overexpression and conditional knockout leukemia models with target expression profiling\",\n      \"pmids\": [\"19584403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect regulation of MMP/chemokine targets not dissected\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Quantified MEF2C activity as the balance point against HDAC4 corepression in skeletal development, using genetic epistasis to show stoichiometric opposition controls endochondral ossification.\",\n      \"evidence\": \"Multiple MEF2C transgenic alleles crossed with Hdac4 knockout, with histology\",\n      \"pmids\": [\"17336904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chondrocyte target genes not enumerated\", \"Signal controlling HDAC4 in this context not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved post-translational control of MEF2C abundance, defining an APC/C-CDC20 degradation pathway dependent on a D-box and two phospho-degrons, and a Calmodulin-CaMKII-HDAC enhancer-activation cascade in neural crest.\",\n      \"evidence\": \"Degron mutagenesis with CDC20 co-IP; CRISPR enhancer deletion and pathway manipulation in mice\",\n      \"pmids\": [\"25789873\", \"26160899\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of failed mitotic degradation not established in tissue\", \"Kinase responsible for the APC/C phospho-degrons not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated MEF2C controls SOST/sclerostin in osteocytes via a distal enhancer and acts to suppress endothelial inflammation through NF-κB inhibition and KLF2 induction, broadening its tissue repertoire.\",\n      \"evidence\": \"ChIP for MEF2C/HDAC5/H3K27ac, HDAC5 knockout mice, endothelial conditional knockout and leukocyte adhesion assays\",\n      \"pmids\": [\"25271055\", \"25474999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect KLF2 regulation not fully resolved\", \"Cross-talk between osteocyte and inflammatory roles unexamined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established MEF2C as a repressor in cortical excitatory neurons that sets the excitatory/inhibitory synaptic balance and as a genome-wide co-regulator with EBF1 in B-cell fate, while defining direct cardiac developmental targets (Tdgf1).\",\n      \"evidence\": \"Conditional knockouts with electrophysiology/behavior, ChIP-seq with EBF1, HDAC7 co-IP, and AHF-specific enhancer/ChIP analysis\",\n      \"pmids\": [\"27779093\", \"26900922\", \"26811383\", \"27989458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MEF2C switches between activator and repressor modes not mechanistically resolved\", \"Direct neuronal target genes only partially defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified phosphorylation-dependent MEF2C activity as a therapeutic dependency in AML, mapping a MARK/LKB1-SIK3-HDAC4 axis that sustains acetylation at MEF2C enhancers and is pharmacologically targetable.\",\n      \"evidence\": \"S222A knock-in mice, functional proteomics, domain-focused CRISPR screen, ChIP-seq and SIK inhibitor treatment of AML\",\n      \"pmids\": [\"29431698\", \"29526696\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of phospho-dependent target enhancers not catalogued\", \"Selectivity of SIK inhibition for leukemic vs normal MEF2C function unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Dissected the cell-lineage origin of MEF2C's cardiovascular requirement, showing the vascular phenotype is secondary to an early myocardial requirement.\",\n      \"evidence\": \"Nkx2-5Cre vs Etv2::Cre lineage-specific conditional knockouts with phenotyping\",\n      \"pmids\": [\"30521808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Myocardial target program driving lethality not fully defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked MEF2C DNA-binding-domain mutations to a haploinsufficiency neurodevelopmental syndrome and separated its neuronal versus microglial contributions to distinct behavioral domains.\",\n      \"evidence\": \"Patient mutation functional analysis with cell-type-specific heterozygous knockouts, electrophysiology, behavior, and RNA-seq\",\n      \"pmids\": [\"32418612\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Microglial MEF2C target genes underlying behavior not identified\", \"Mechanism of non-cell-autonomous microglial effect unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended MEF2C function to sleep homeostasis and activity-dependent neuronal gene expression, showing its phosphorylation status couples sleep loss to synaptic strength regulation.\",\n      \"evidence\": \"Postnatal forebrain conditional knockout with EEG/SWA, synaptic assays, phospho-MEF2C analysis; GluN3A knockdown with p38 pathway analysis\",\n      \"pmids\": [\"32851972\", \"32393578\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase/phosphatase controlling sleep-regulated MEF2C phosphorylation not pinpointed\", \"Direct sleep-regulated target genes only partly defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined metabolic and inflammatory roles for MEF2C: licensing IL-2/IL-15-driven lipid metabolism in NK cells via SREBP, and driving M1 macrophage IL-12 transcription, with direct human haploinsufficiency relevance for NK function.\",\n      \"evidence\": \"CRISPR knockout screens in NK cells, patient-cell analysis, myeloid-specific knockout mice with infection/colitis models and ChIP/reporter assays\",\n      \"pmids\": [\"38589619\", \"35194174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect SREBP pathway regulation not fully resolved\", \"Whether the same kinase inputs operate in immune cells untested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed MEF2C as a pioneer/chromatin-remodeling factor that recruits p300 and cardiogenic factors during cardiomyocyte reprogramming, and connected microglial cGAS-IFN-I signaling to suppression of the neuronal MEF2C network in tauopathy.\",\n      \"evidence\": \"ChIP-seq for MEF2C/p300 with p300 inhibition in iCM reprogramming; Cgas conditional knockout and inhibition in tauopathy mice\",\n      \"pmids\": [\"37315521\", \"37095396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How IFN-I lowers the MEF2C network molecularly not resolved\", \"Pioneer-factor mechanism (nucleosome engagement) not directly demonstrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a developmental-stage-specific requirement for MEF2C in parvalbumin interneuron maturation, refining the cellular basis of MEF2C-associated cortical dysfunction.\",\n      \"evidence\": \"Embryonic vs postnatal conditional Mef2c deletion in PV-INs with slice/in vivo electrophysiology and behavior\",\n      \"pmids\": [\"38848814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Target genes driving PV-IN maturation not identified\", \"Why the requirement is temporally restricted unexplained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the same MEF2C molecule is mechanistically switched between transcriptional activation and repression, and how its many upstream kinase and cofactor inputs are integrated into cell-type-specific target selection.\",\n      \"evidence\": \"No single study in the corpus reconciles the activator/repressor duality or the combinatorial cofactor logic\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model of activator-to-repressor switching\", \"Genome-wide cofactor occupancy not jointly mapped across cell types\", \"Isoform-specific (e.g. γ+) target codes incompletely defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 8, 22, 26, 33, 39, 43]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [7, 17, 18, 26, 33, 35, 46]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 4, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 8, 26, 33, 39]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 6, 10, 26, 32, 45]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 9, 23, 39, 40]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 29, 30, 37]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HDAC5\", \"HDAC4\", \"HDAC7\", \"NKX2-5\", \"EBF1\", \"SOX18\", \"GLI2\", \"CDC20\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}