Patterns of gene expression during Drosophila mesoderm development.

Area of Science:

• Developmental biology
• Genetics
• Molecular biology

Background:

• The transcription factor Twist initiates Drosophila mesoderm development.
• Mesoderm forms heart, somatic muscle, and other cell types.

Purpose of the Study:

• To identify genes involved in Drosophila mesoderm development using transcriptomic profiling.
• To understand the role of Twist in regulating gene expression during mesoderm formation.

Main Methods:

• Utilized a Drosophila embryo sorter to isolate homozygous twist mutant embryos.
• Performed DNA microarray experiments to compare transcription profiles.
• Compared gene expression in twist loss-of-function, ubiquitous twist expression, and wild-type embryos across developmental stages.

Main Results:

• Identified hundreds of genes implicated in stage-specific mesoderm development.
• Many identified genes have homologs in vertebrates.
• Discovered the gene gleeful, related to vertebrate Gli genes, is essential for somatic muscle development.
• Demonstrated gleeful can induce muscle marker expression in neural cells.

Conclusions:

• Twist regulates a large network of genes critical for mesoderm development.
• The identified genes and pathways are conserved across species.
• The gene gleeful plays a significant role in somatic muscle formation and has implications for cell fate determination.