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Updated: Jul 12, 2026
13:47
Chromatin Immunoprecipitation (ChIP) using Drosophila tissue
Published on: March 23, 2012
The Drosophila ACE3 chorion element autonomously induces amplification
J L Carminati1, C G Johnston, T L Orr-Weaver
1Department of Biology, Massachusetts Institute of Technology, Cambridge.
Molecular and Cellular Biology
|May 1, 1992
Summary
The amplification control element 3 (ACE3) in Drosophila regulates chorion gene amplification. A single ACE3 sequence drives amplification, but limited replication initiation rounds result in low amplification levels.
Area of Science:
- Developmental Biology
- Molecular Genetics
- Drosophila melanogaster Research
Background:
- Drosophila chorion genes amplify via DNA replication reinitiation in follicle cells.
- The amplification control element 3 (ACE3) is crucial for third-chromosome chorion gene cluster amplification.
Purpose of the Study:
- To determine if a single ACE3 sequence can autonomously regulate chorion gene amplification with developmental specificity.
- To investigate the impact of ACE3 on amplification levels and initiation sites.
- To analyze the amplification gradient and stability of ACE3-containing transposons.
Main Methods:
- Deletion experiments to identify the ACE3 control element.
- Transposon-mediated insertion of ACE3 sequences into the Drosophila genome.
- Analysis of DNA amplification gradients and replication initiation.
Main Results:
- A 440-bp ACE3 sequence is sufficient for developmentally specific amplification, independent of other chorion elements.
- Amplification initiated at or near ACE3, but levels were low, suggesting limited replication rounds.
- ACE3 transposon insertions created amplification gradients similar to endogenous loci.
- Multiple ACE3 copies in tandem arrays were stable, but P-element mobilization caused deletions.
Conclusions:
- ACE3 acts as a key regulator for chorion gene amplification in Drosophila.
- Limited initiation rounds of DNA replication constrain amplification levels controlled by ACE3.
- ACE3-containing transposon arrays offer insights into amplification control and genome stability.
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