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Author Spotlight: An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations

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Origin and evolution of the enhancer of split complex.

Peter K Dearden¹

¹Genetics Otago and Gravida (National Centre for Growth and Development), Biochemistry Department, University of Otago, Dunedin, Aotearoa, New Zealand. peter.dearden@otago.ac.nz.

|September 20, 2015

Summary

The Enhancer of split complex, crucial for neurogenesis in arthropods, originated before insects and crustaceans diverged. This gene cluster has evolved with variations but remains essential for development.

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Area of Science:

Evolutionary biology
Genomics
Developmental biology

Background:

The Enhancer of split complex is a gene cluster in arthropods, vital for neurogenesis.
It comprises basic helix-loop-helix-orange domain transcription factors and bearded genes.
Notch signaling often regulates this complex.

Purpose of the Study:

To trace the evolutionary history of the Enhancer of split complex in Arthropoda.
To understand the origins and maintenance of this gene complex.

Main Methods:

Comparative genomics analysis of recently sequenced Arthropod genomes.
Phylogenetic analysis to infer gene origins and duplication/loss events.

Main Results:

The basic helix-loop-helix-orange domain genes predated the insect-crustacean ancestor and complex formation.
A four-gene cluster structure was conserved throughout evolution, with lineage-specific changes.
The complex is absent in some chalcid wasps, posing questions about their neurogenesis.

Conclusions:

The Enhancer of split complex likely formed in the common ancestor of crustaceans and insects.
Its maintenance suggests a role in conserved functions like coordinate gene regulation.
Evolutionary variations highlight the complex's dynamic nature.