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The Genomes of Two Billfishes Provide Insights into the Evolution of Endothermy in Teleosts
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The Genomes of Two Billfishes Provide Insights into the Evolution of Endothermy in Teleosts
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Journal Article
The Genomes of Two Billfishes Provide Insights into the Evolution of Endothermy in Teleosts
2021
Overview
Endothermy is a typical convergent phenomenon which has evolved independently at least eight times in vertebrates, and is of significant advantage to organisms in extending their niches. However, how vertebrates other than mammals or birds, especially teleosts, achieve endothermy has not previously been fully understood. In this study, we sequenced the genomes of two billfishes (swordfish and sailfish), members of a representative lineage of endothermic teleosts. Convergent amino acid replacements were observed in proteins related to heat production and the visual system in two endothermic teleost lineages, billfishes and tunas. The billfish-specific genetic innovations were found to be associated with heat exchange, thermoregulation, and the specialized morphology, including elongated bill, enlarged dorsal fin in sailfish and loss of the pelvic fin in swordfish.
