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Quail myoD is regulated by a complex array of cis-acting control sequences
D F Pinney1, F C de la Brousse, A Faerman
1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111, USA.
Developmental Biology
|July 1, 1995
Summary
Researchers identified key regulatory DNA regions controlling quail MyoD (QmyoD) gene expression. These sequences ensure QmyoD is correctly expressed in specific tissues during development, revealing conserved regulatory mechanisms with mammals.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Gene Regulation
Background:
- Quail MyoD (QmyoD) is the earliest MyoD family member in quail somites, crucial for muscle development.
- Its transcription is triggered by early developmental signals, necessitating precise regulatory control.
Purpose of the Study:
- To define the cis-acting DNA sequences responsible for tissue-specific and developmentally correct QmyoD expression.
- To characterize the regulatory properties of the QmyoD gene locus.
Main Methods:
- Isolation and sequencing of the QmyoD gene locus.
- Reporter gene assays in cell lines and primary quail cells following DNA transfection.
- Analysis of reporter gene expression in transgenic mice.
Main Results:
- Identified three distinct cis-acting regulatory regions controlling QmyoD expression.
- A distal control region (DCR) contains separable enhancers directing somite- and muscle-specific expression in transgenic mice.
- The promoter and a proximal region (PR) also contribute to muscle-specific and differential gene expression.
Conclusions:
- QmyoD expression is governed by multiple regulatory regions, including enhancers and promoter elements.
- Key features of MyoD gene regulation are conserved between avian (quail) and mammalian species.