Molecular evolution of umami/sweet taste receptor genes in reptiles

PeerJ
Ping Feng, Shichu Liang

Abstract

Sensory systems play an important role in animal survival. Changes to these systems may be critical in evolution of species in new environments. Previous studies exploring the correlation between feeding ecology and Tas1r evolution mainly focused on mammals and birds, and found that the relationship was complex. However, in reptiles, the correlation between Tas1r evolution and dietary preferences is still unclear. Here, we attempted to explore this relationship in representative species of the major groups of reptiles (turtles, snakes, lizards, crocodilians), for which the genome information is known. We first predicted the functionality (intact, partial, or defective) of Tas1r, and then related it to the feeding preferences. As a result, we identified 11 Tas1r1, 12 Tas1r2, and 12 Tas1r3 genes to be partial or intact and another 22 Tas1r genes to be absent or pseudogenized in the 19 reptiles. We found that, as it was revealed in some other vertebrate groups, no correlation existed between feeding ecology and Tas1r evolution in reptiles: genomic prediction indicated that the Tas1r genes possibly have been lost or pseudogenized in snakes, but in crocodylia and testudines Tas1r genes are either intact or partial, regardless of the...Continue Reading

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Citations

Jun 12, 2019·PloS One·John D LloydJosé A Salguero-Faría

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Methods Mentioned

BETA
transgenic

Software Mentioned

BLAST
TMHMM
Ensembl
TimeTree
TblastN
ClustalX

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