Related Experiment Videos
cis-acting control elements for Krüppel expression in the Drosophila embryo
M Hoch1, C Schröder, E Seifert
1Institut für Genetik und Mikrobiologie der Universität München, FRG.
The EMBO Journal
|August 1, 1990
Summary
Researchers identified specific DNA sequences controlling Krüppel (Kr) gene expression in Drosophila embryos. These cis-regulatory elements are crucial for establishing gene patterns during development.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Krüppel (Kr) is a key gap gene in Drosophila melanogaster embryogenesis.
- Kr gene exhibits complex spatial and temporal expression patterns crucial for development.
Purpose of the Study:
- To identify cis-acting DNA sequences regulating Kr gene expression.
- To understand the regulatory mechanisms underlying Kr gene's spatial pattern formation.
Main Methods:
- Analysis of fusion gene constructs with bacterial lacZ reporter gene under Kr regulatory sequences.
- Expression pattern analysis in transgenic Drosophila embryos at various developmental stages.
Main Results:
- Identified multiple cis-acting Kr control units driving lacZ expression in 10 known Kr expression domains.
- Discovered distinct elements regulating anterior blastoderm, nervous system, midline precursor, and amnioserosa expression.
- Found two specific elements controlling early zygotic Kr expression in a central striped pattern.
- Demonstrated these elements respond to maternal organizer gene activities.
Conclusions:
- Multiple cis-regulatory elements precisely control Krüppel gene expression domains.
- Two elements are critical for initial Kr zygotic expression and segment formation.
- These findings elucidate the genetic basis of early Drosophila segmentation.