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A Web-Based Workflow for Selecting Gene- and Tissue-Specific Enhancers

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Physical interaction between TBX5 and MEF2C is required for early heart development.

Tushar K Ghosh¹, Fei Fei Song, Elizabeth A Packham

¹Institute of Genetics, School of Biology, University of Nottingham, Queen's Medical Centre, Nottingham, United Kingdom.

Molecular and Cellular Biology

|February 11, 2009

Summary

TBX5 and MEF2C physically interact to activate MYH6 gene expression, crucial for heart development. This interaction is essential for cardiomyocyte differentiation and survival, with mutations impairing cardiac function.

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Area of Science:

Molecular Biology
Developmental Biology
Genetics

Background:

TBX5 is a transcription factor vital for heart and upper limb development.
Mutations in TBX5 cause the inherited Holt-Oram syndrome.
MEF2C is another key regulator in cardiac development.

Purpose of the Study:

To investigate the functional interaction between TBX5 and MEF2C.
To elucidate the role of this interaction in MYH6 gene regulation.
To understand the impact of TBX5 mutations on this interaction and cardiac development.

Main Methods:

Fluorescence resonance energy transfer (FRET) to detect protein-protein interaction in living cells.
Analysis of physical association on the MYH6 promoter.
Zebrafish morpholino-mediated knockdowns of Tbx5 and Mef2c.

Main Results:

TBX5 and MEF2C physically interact and synergistically activate MYH6 expression.
Mutant TBX5 proteins impair this synergistic activation.
The interaction is essential for MYH6 expression, early heart development, and survival in zebrafish.

Conclusions:

This study reports the first functional interaction between a T-box protein (TBX5) and a MADS box factor (MEF2C).
This interaction is critical for cardiomyocyte differentiation and heart development.
Understanding this interaction provides insights into Holt-Oram syndrome pathogenesis.