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Related Concept Videos

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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FoxP1 Represses MEF2A in Striated Muscle.

Sydney Steiman1,2,3, Tetsuaki Miyake1,2,3, John C McDermott1,2,3

  • 1Department of Biology, York University, Toronto, ON, Canada.

Molecular and Cellular Biology
|March 14, 2024
PubMed
Summary
This summary is machine-generated.

The transcription factor FOXP1 interacts with MEF2A, inhibiting its activity in muscle development and cardiomyocyte growth. This interaction is crucial for regulating cell differentiation and preventing pathological gene re-activation.

Keywords:
FOXP1MEF2Myogenesiscardiomyocytedifferentiationphosphorylation

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Area of Science:

  • Molecular and Cellular Biology
  • Developmental Biology
  • Cardiovascular Research

Background:

  • Myocyte enhancer factor 2 (MEF2) proteins regulate diverse vertebrate developmental, physiological, and pathological processes.
  • Understanding MEF2A's protein interactions is vital due to its involvement in numerous biological functions.

Purpose of the Study:

  • To comprehensively characterize the MEF2A interactome.
  • To investigate the functional consequences of MEF2A's interaction with the transcriptional repressor FOXP1.

Main Methods:

  • Utilized a nanobody-based affinity-purification coupled with mass spectrometry (AP-MS) strategy.
  • Employed GFP-tagged MEF2A and a GBP-nanobody for capturing MEF2A protein complexes from myogenic lysates.
  • Performed Liquid Chromatography-Mass Spectrometry/Mass Spectrometry (LC-MS/MS) for proteomic analysis and identified interactors.

Main Results:

  • Identified FOXP1 as a MEF2A interactor that coprecipitates with MEF2A in proliferating myogenic cells, with reduced interaction upon differentiation.
  • Demonstrated that ectopic FOXP1 expression inhibits MEF2A-driven myogenic reporter genes and delays endogenous myogenin induction.
  • Showed that FOXP1 depletion enhances MEF2A transactivation and myogenin expression; this interaction is preserved in cardiomyocytes, where FOXP1 depletion promotes hypertrophy.

Conclusions:

  • FOXP1 acts as a negative regulator of MEF2A activity, preventing premature myogenic progenitor differentiation.
  • FOXP1 restricts MEF2A function, potentially preventing the re-activation of embryonic gene expression in conditions like cardiomyocyte hypertrophy.
  • The MEF2A-FOXP1 interaction plays a significant role in muscle development and cardiac pathophysiology.