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Drosophila mef2 expression during mesoderm development is controlled by a complex array of cis-acting regulatory
1Department of Medicine, Division of Cardiology, Forchheimer G42, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York, 10461, USA. hnguyen@aecom.yu.edu
Developmental Biology
|January 12, 1999
Summary
The Drosophila mef2 gene controls muscle cell differentiation through complex regulatory elements. These enhancers ensure precise gene expression patterns during embryonic development for various muscle types.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- The Drosophila mef2 gene, a MADS box transcription factor, is essential for the differentiation of somatic, visceral, and cardiac muscle cells.
- Mef2 exhibits dynamic expression patterns during embryogenesis, including broad mesodermal, dorsal mesoderm-restricted, progenitor-specific, and sustained differentiated expression.
Purpose of the Study:
- To investigate the cis-acting regulatory modules controlling the temporal and spatial expression of the Drosophila mef2 gene.
- To identify the genetic signals and enhancer elements responsible for specific mef2 expression in different myogenic lineages.
Main Methods:
- Functional testing of approximately 12 kb of the 5' flanking region of the mef2 gene.
- Analysis of enhancer activity in response to genetic signals like twist and dpp (decapentaplegic).
- Investigation of the roles of Medea (Smad4 homolog) and Mad in regulating mef2 expression.
Main Results:
- A 280-bp twist-dependent enhancer drives initial widespread mesodermal expression.
- A 460-bp dpp-responsive module, involving Medea and Mad, mediates dorsal mesoderm-restricted expression.
- Distinct enhancers control mef2 expression in visceral mesoderm (gut musculature) and cardioblasts (heart), with multiple elements regulating expression in muscle founders, myoblasts, and differentiated fibers.
Conclusions:
- Drosophila mef2 expression in myogenic lineages is orchestrated by a complex interplay of multiple cis-acting regulatory modules.
- These distinct enhancers respond to different genetic inputs, ensuring precise temporal and spatial activation of mef2 during muscle development.
- The additive action of these enhancers on the 5' flanking region underlies the specific expression patterns of mef2 in the developing Drosophila embryo.