Origin and evolution of the Rax homeobox gene by comprehensive evolutionary analysis.

FEBS Open Bio
Tetsuo Kon, Takahisa Furukawa

Abstract

Rax is one of the key transcription factors crucial for vertebrate eye development. In this study, we conducted comprehensive evolutionary analysis of Rax. We found that Bilateria and Cnidaria possess Rax, but Placozoa, Porifera, and Ctenophora do not, implying that the origin of the Rax gene dates back to the common ancestor of Cnidaria and Bilateria. The results of molecular phylogenetic and synteny analyses on Rax loci between jawed and jawless vertebrates indicate that segmental duplication of the Rax locus occurred in an early common ancestor of jawed vertebrates, resulting in two Rax paralogs in jawed vertebrates, Rax and Rax2. By analyzing 86 mammalian genomes from all four major groups of mammals, we found that at least five independent Rax2 gene loss events occurred in mammals. This study may provide novel insights into the evolution of the eye.

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Citations

Aug 31, 2020·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Erik S DavisTom Glaser
Sep 1, 2021·Scientific Reports·Yohey Ogawa, Joseph C Corbo

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Datasets Mentioned

BETA
ERR466755

Software Mentioned

tblastn
UCSC Genome Browser
tranalign
Illustrator for Biological Sequences
Clustal X
clustal omega
blastp
MEGA7
muscle
jalview

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