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Comparative Genomics Reveals Accelerated Evolution in Conserved Pathways during the Diversification of Anole Lizards.
Marc Tollis1,2, Elizabeth D Hutchins1,3, Jessica Stapley4
1School of Life Sciences, Arizona State University.
Genome Biology and Evolution
|January 24, 2018
Summary
Genomic analysis of anole lizards reveals rapid molecular evolution and selection on genes related to behavior, sensory perception, and limb development. These findings shed light on the genetic underpinnings of anole lizard diversification.
Area of Science:
- Genomics
- Evolutionary Biology
- Herpetology
Background:
- Squamates (lizards and snakes) exhibit extreme morphological diversity, yet comparative genomic resources are limited.
- Anole lizards represent a significant radiation within squamates, offering a model for studying phenotypic diversification.
- Understanding the molecular basis of adaptations in anoles is crucial for squamate evolutionary studies.
Purpose of the Study:
- To perform comparative genomic analyses of anole lizards.
- To investigate the molecular evolutionary rates and selection pressures driving anole diversification.
- To identify genes associated with key phenotypic traits and behavioral adaptations in anoles.
Main Methods:
- Sequencing and assembly of draft genomes for three anole species (Anolis frenatus, Anolis auratus, Anolis apletophallus).
- Comparative genomic analysis against the Anolis carolinensis reference genome.
- Identification of genes under positive and purifying selection, including those involved in development and behavior.
Main Results:
- Anole genomes show a rapid background rate of molecular evolution, consistent with punctuated equilibrium.
- Strong purifying selection acts on functional genomic elements.
- Accelerated evolution observed in genes related to behavior, sensory perception, reproduction, and limb development (hindlimb specification).
- Signatures of positive selection detected in genes associated with forebrain development, hormones, and dewlap development.
Conclusions:
- Molecular changes in genes regulating behavior, sensory perception, and reproduction have driven anole lizard diversification.
- Genetic adaptations in forebrain development, hormones, and dewlap traits likely reinforce species boundaries and contribute to anole radiation.
- Comparative genomics provides insights into the evolution of complex traits in a speciose vertebrate clade.
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