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Related Experiment Video

Updated: Dec 23, 2025

A Rapid In Vivo Bioassay for Developmentally Active Enhancers

A Rapid In Vivo Bioassay for Developmentally Active Enhancers

Disparate expression specificities coded by a shared Hox-C enhancer.

Steve W Miller¹, James W Posakony¹

¹Division of Biological Sciences, Section of Cell & Developmental Biology, University of California San Diego, La Jolla, United States.

|April 29, 2020

Summary

This summary is machine-generated.

A single regulatory element, EO053, in Drosophila controls two genes, pb and zen2, with distinct expression patterns. This shared enhancer demonstrates how genes can diverge while retaining a common regulatory sequence.

Keywords:

D. melanogaster Hox developmental biology enhancer evolution gene regulation genetics genomics proboscipedia zen2

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Area of Science:

Developmental Biology
Genetics
Evolutionary Biology

Background:

Adjacent genes can evolve distinct functions while sharing regulatory elements.
The Antennapedia Complex in Drosophila contains genes with crucial developmental roles.

Purpose of the Study:

To investigate if a single regulatory sequence can govern the expression of two functionally diverging genes.
To characterize the role of the EO053 enhancer in regulating pb and zen2 gene expression.

Main Methods:

Analysis of the EO053 enhancer in the Drosophila Antennapedia Complex.
Genomic deletion experiments to assess enhancer function.
Sequence conservation analysis across Schizophora.
Examination of synteny between Hox2 and Hox3 orthologs in Arthropods.

Main Results:

The EO053 enhancer directs aspects of both pb and zen2 gene expression, despite their disparate patterns.
Specific sequences within EO053 influence both pb-like and zen2-like expression.
EO053 collaborates with other enhancers to regulate pb and zen2 mRNA levels.
Conserved synteny suggests a shared regulatory history for Hox2 and Hox3 orthologs predating their divergence.

Conclusions:

A single promiscuous enhancer (EO053) can regulate two genes (pb and zen2) that have undergone functional divergence.
This finding provides an example of how shared regulatory regions can contribute to the evolution of distinct gene outputs.