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Tbx1 is a negative modulator of Mef2c
Luna Simona Pane1, Zhen Zhang, Rosa Ferrentino
1Institute of Genetics and Biophysics, National Research Council, 80131 Naples, Italy.
Human Molecular Genetics
|February 28, 2012
Summary
T-box transcription factor Tbx1 dosage affects gene expression, including Mef2c. Tbx1 suppresses cardiac progenitor differentiation and impacts skeletal muscle development by regulating Mef2c.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Genomics
Background:
- T-box transcription factor Tbx1 plays a crucial role in embryonic development.
- The dosage of Tbx1 is critical for its developmental functions.
- Previous studies established a Tbx1 mouse allelic series.
Purpose of the Study:
- To investigate the impact of Tbx1 dosage on gene expression during embryonic development.
- To identify downstream targets of Tbx1.
- To elucidate the regulatory relationship between Tbx1 and Mef2c.
Main Methods:
- Microarray-based transcriptome analysis of embryonic tissues (E9.5).
- Analysis of Tbx1 null and gain-of-function mouse mutants.
- In vivo validation of gene expression changes in specific embryonic fields (e.g., second heart field, somites).
- Chromatin analysis to assess Tbx1 binding to regulatory regions.
Main Results:
- Tbx1 dosage negatively correlates with the expression of Mef2c, a cardiogenic transcription factor.
- Mef2c is upregulated in Tbx1 null mutants and downregulated in Tbx1 gain-of-function mutants.
- Tbx1 directly binds to regulatory regions of the Mef2c locus and interferes with the Gata4→Mef2c pathway.
- Tbx1's role in suppressing cardiac progenitor differentiation and its effect on skeletal muscle differentiation are linked to Mef2c regulation.
Conclusions:
- Tbx1 dosage critically regulates Mef2c expression during embryonic development.
- Tbx1 influences both cardiac and skeletal muscle differentiation through Mef2c.
- The study highlights the utility of dosage gradient approaches for uncovering developmental gene regulation.
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