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The active form of Mef2c promotes maturation of induced cardiomyocytes

ABSTRACT: The active form of Mef2c promotes maturation of induced cardiomyocytes

PROVIDER: PRJNA923681 | ENA |

REPOSITORIES: ENA

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The active form of Mef2c promotes maturation of induced cardiomyocytes with p300 in direct cardiac reprogramming

Project description:Direct cardiac reprogramming converts fibroblasts into induced cardiomyocytes (iCMs) with the minimal combination of transcription factors, Gata4 (G), Mef2c (M), and Tbx5 (T). However, the induction of functional mature iCMs is inefficient and the mechanisms remain elusive. Mef2c is a central transcription factor in direct cardiac reprogramming. We investigated the effect of Mef2c isoforms(M1, M2, M6) and transcriptional activity (M2TAD) on cardiac reprogramming on cardiac reprogramming. Then, we found that the active form of Mef2c evoked epigenetic remodeling cooperating with p300 and promoted the maturation of iCMs.

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MEF2C/p300-mediated epigenetic remodeling promotes the maturation of induced cardiomyocytes.

Project description:Cardiac transcription factors (TFs) directly reprogram fibroblasts into induced cardiomyocytes (iCMs), where MEF2C acts as a pioneer factor with GATA4 and TBX5 (GT). However, the generation of functional and mature iCMs is inefficient, and the molecular mechanisms underlying this process remain largely unknown. Here, we found that the overexpression of transcriptionally activated MEF2C via fusion of the powerful MYOD transactivation domain combined with GT increased the generation of beating iCMs by 30-fold. Activated MEF2C with GT generated iCMs that were transcriptionally, structurally, and functionally more mature than those generated by native MEF2C with GT. Mechanistically, activated MEF2C recruited p300 and multiple cardiogenic TFs to cardiac loci to induce chromatin remodeling. In contrast, p300 inhibition suppressed cardiac gene expression, inhibited iCM maturation, and decreased the beating iCM numbers. Splicing isoforms of MEF2C with similar transcriptional activities did not promote functional iCM generation. Thus, MEF2C/p300-mediated epigenetic remodeling promotes iCM maturation.

| S-EPMC10277823 | biostudies-literature

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