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Related Experiment Video

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Adaptation at the Extremes of Life: Experimental Evolution with the Extremophile Archaeon Sulfolobus acidocaldarius

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Molecular adaptation during a rapid adaptive radiation.

Maxim V Kapralov¹, Antonina A Votintseva, Dmitry A Filatov

¹Department of Plant Sciences, University of Oxford, Oxford, United Kingdom.

Molecular Biology and Evolution

|January 29, 2013

Summary

Island adaptive radiations show rapid evolution driven by positive selection in protein-coding genes. This study reveals key genes involved in defense, photosynthesis, and reproduction are evolving under strong selection in Hawaiian Schiedea plants.

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Area of Science:

Evolutionary Biology
Genetics
Botany

Background:

Island adaptive radiations are puzzling evolutionary events.
The genetic underpinnings of rapid island evolution are largely unknown.
Island environments often drive rapid diversification.

Purpose of the Study:

To investigate the role of positive selection in protein-coding genes during island adaptive radiation.
To identify specific genes under selection in the Hawaiian plant genus Schiedea.
To compare selection patterns in island populations versus mainland relatives.

Main Methods:

Analyzed 36 genes from the Hawaiian endemic plant genus Schiedea.
Used comparative genomics to detect positive selection.
Compared selection pressures in Hawaiian Schiedea with eight mainland plant groups.

Main Results:

Identified 5 out of 36 studied genes evolving under positive selection in Hawaiian Schiedea.
Positively selected genes are associated with defense mechanisms, photosynthesis, and reproduction.
Hawaiian Schiedea showed relaxed purifying selection and more widespread positive selection compared to mainland groups.

Conclusions:

Adaptive evolution of protein-coding genes significantly contributes to island adaptive radiations.
Positive selection acts on genes involved in key ecological and reproductive functions during island diversification.
Genetic mechanisms underlying rapid island evolution are becoming clearer through gene-level analysis.