Evolutionary Fate of the Androgen Receptor-Signaling Pathway in Ray-Finned Fishes with a Special Focus on Cichlids

G3 : Genes - Genomes - Genetics
Thibault LorinAstrid Böhne

Abstract

The emergence of the steroid system is coupled to the evolution of multicellular animals. In vertebrates in particular, the steroid receptor repertoire has been shaped by genome duplications characteristic to this lineage. Here, we investigate for the first time the composition of the androgen receptor-signaling pathway in ray-finned fish genomes by focusing in particular on duplicates that emerged from the teleost-specific whole-genome duplication. We trace lineage- and species-specific duplications and gene losses for the genomic and nongenomic pathway of androgen signaling and subsequently investigate the sequence evolution of these genes. In one particular fish lineage, the cichlids, we find evidence for differing selection pressures acting on teleost-specific whole-genome duplication paralogs at a derived evolutionary stage. We then look into the expression of these duplicated genes in four cichlid species from Lake Tanganyika indicating, once more, rapid changes in expression patterns in closely related fish species. We focus on a particular case, the cichlid specific duplication of the rac1 GTPase, which shows possible signs of a neofunctionalization event.

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Citations

Feb 23, 2019·The Journal of Biological Chemistry·Prachi BajpaiKeshav K Singh
Oct 28, 2020·Proceedings of the National Academy of Sciences of the United States of America·Beau A AlwardRussell D Fernald
Oct 14, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Andrew P HoadleyBeau A Alward

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Methods Mentioned

BETA
GTPase
GTPases

Software Mentioned

SeaView
PRANK
BLASTn
KaKs
PhyML
Novoalign
DupTree
_ calculator
SAMtools
NetPath

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