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11 - The Evolution of Squamate Chitinase Genes (CHIAs) Supports an Insectivory–Carnivory Transition during the Early History of Snakes

from Part III - Genomic Perspectives

Published online by Cambridge University Press:  30 July 2022

By
Christopher A. Emerling
Edited by
David J. Gower  and
Hussam Zaher
David J. Gower
Affiliation:
Natural History Museum, London
Hussam Zaher
Affiliation:
Universidade de São Paulo
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Summary

Genomic studies have elucidated some molecular underpinnings for adaptations during the early history of snakes, but studies of dietary adaptations remain sparse. Snakes differ from most other squamates by tending towards diets of vertebrate prey (carnivory), whereas arthropods are common in diets of most other squamates (insectivory). To test whether a shift from insectivory to carnivory occurred early in snake history, I examined chitinase genes (CHIAs) in 19 squamates. Previous studies on mammals found that contraction in the number of CHIAs, which enzymatically digest arthropod chitinous exoskeletons, correlates with transitions from insectivory to carnivory or herbivory. I found evidence that CHIAs have a long history in Squamata, with at least seven paralogs inferred in their last common ancestor. Retention of these CHIAs seems to be commonplace for arthropod-eating squamates, but snakes likely lost six CHIAs between diverging from other toxicoferans and the origin of afrophidian snakes. This genomic signal corresponds with an inferred major shift towards carnivory during the origin and evolution of early snakes, which may have contributed to their successful radiation.

Keywords

comparative genomicsdietadaptationgenomesSquamataevolutionbioinformatics
Type
Chapter
Information
The Origin and Early Evolutionary History of Snakes , pp. 235 - 247
Publisher: Cambridge University Press
Print publication year: 2022

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