Abstract
BackgroundTeleost fishes account for over half of extant vertebrate species. A core question in biology is how genomic changes drive phenotypic diversity that relates to the origin of teleost fishes.ResultsHere, we used comparative genomic analyses with chromosome assemblies of diverse lineages of vertebrates and reconstructed an ancestral vertebrate genome, which revealed phylogenomic trajectories in vertebrates. We found that the whole-genome-wide chromosome fission/fusions took place in the Monopterus albus lineage after the 3-round whole-genome duplication. Four times of genomic fission/fusions events resulted in the whole genome-wide chromosome fusions in the genomic history of the lineage. In addition, abundant recently evolved new genes for reproduction emerged in the Monopterus albus after separated from medaka. Notably, we described evolutionary trajectories of conserved blocks related to sex determination genes in teleosts.ConclusionsThese data pave the way for a better understanding of genomic evolution in extant teleosts.
Highlights
Fish is an enormously species-rich group in vertebrates
We described evolutionary trajectories of conserved blocks related to sex determination genes in teleosts and three independent origins of corresponding loci/chromosomes in vertebrates
Evolutionary trajectory of the chromosomes in fishes To investigate the evolutionary trajectory of the chromosomes in fishes with addition of the Monopterus albus chromosome data based on phylogenetic relationship, we first confirmed 3R wholegenome duplication (WGD) occurred in the Monopterus albus lineage
Summary
Fish is an enormously species-rich group in vertebrates. Total number of fish species is over 35,200, and approximately 2000 new fish species have been named in the past 5 years [1]. Fishes account for more than half of extant vertebrate species, and show a rich evolutionary diversity [2]. Fishes display remarkable variations in morphological and physiological adaptations, which is one of successful group of vertebrates evolutionarily. Fishery is an important part in the economy of many nations. Teleost fishes account for over half of extant vertebrate species. A core question in biology is how genomic changes drive phenotypic diversity that relates to the origin of teleost fishes
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