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Updated: Dec 13, 2025

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Bab2 Functions as an Ecdysone-Responsive Transcriptional Repressor during Drosophila Development
Jianli Duan1, Yunpo Zhao2, Haichao Li3
1Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 106 91 Stockholm, Sweden; CAS Key Laboratory of Insect Developmental and Evolutionary Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.
Bric-à-brac 2 (Bab2) acts as a key repressor, controlling gene timing during Drosophila metamorphosis. It terminates salivary gland secretion gene expression, ensuring proper development in response to ecdysone steroid pulses.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Drosophila development relies on ecdysone steroid pulses to regulate gene expression.
- Mechanisms ensuring tissue-specific responses to these pulses remain unclear.
Purpose of the Study:
- Identify novel regulators of temporal gene expression during Drosophila metamorphosis.
- Characterize the role of Bric-à-brac 2 (Bab2) in salivary gland development and metamorphosis.
Main Methods:
- Investigated Bab2's function through genetic manipulation in Drosophila.
- Analyzed gene expression patterns of Salivary gland secretion (Sgs) genes.
- Performed in vitro binding assays to assess Bab2's interaction with Sgs loci.
Main Results:
- Bab2 acts as an ecdysone-responsive transcriptional repressor.
- Bab2 is essential for terminating Sgs gene expression during the larval to pupal transition.
- Premature Bab2 expression leads to precocious salivary gland histolysis.
- Bab2 directly binds to and represses Sgs gene loci.
Conclusions:
- Bab2 is a critical temporal regulator of somatic gene expression.
- Its activity is controlled by the ecdysone-responsive transcription factor Broad.
- Bab2 mediates the termination of Sgs gene expression in response to ecdysone signaling.
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