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Development, plasticity and evolution of butterfly eyespot patterns.

P M Brakefield¹, J Gates, D Keys

¹Institute of Evolutionary and Ecological Sciences, University of Leiden, Kaiserstraat 63, Postbus 9516, 2300 RA Leiden, The Netherlands.

|November 21, 1996

Summary

Butterfly eyespot patterns develop through a distinct genetic pathway, allowing for rapid evolution. Changes in regulatory genes control eyespot number, size, and color, independent of other wing features.

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Area of Science:

Developmental biology
Evolutionary genetics
Pattern formation

Background:

Butterfly wing patterns, particularly eyespots, exhibit remarkable diversity.
Understanding the genetic and developmental mechanisms underlying these patterns is crucial for evolutionary studies.

Purpose of the Study:

To investigate the developmental and genetic underpinnings of butterfly eyespot formation, plasticity, and diversity.
To elucidate the regulatory pathways controlling eyespot characteristics such as position, number, size, and color.

Main Methods:

Analysis of eyespot pattern mutants.
Examination of regulatory gene expression.
Transplantation of eyespot developmental organizers.

Main Results:

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Eyespot development follows a progressive pathway, largely independent of other pattern elements.
Eyespot position, number, size, and color are determined sequentially within this pathway.
The developmental pathway is conserved across species.

Conclusions:

Eyespot patterns evolve rapidly through modifications of their developmental pathway.
Evolutionary changes in eyespot patterns can be driven by single or few regulatory gene alterations.