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Complete Mitogenomes of Tree Frogs Unveil Gene Rearrangement and Concerted Evolution Within Rhacophoridae

Abstract

New developments in sequencing technology and nucleotide analysis have allowed us to make great advances in reconstructing anuran phylogeny. As a clade of representative amphibians that have radiated from aquatic to arboreal habitats, our understanding of the systematic status and molecular biology of rhacophorid tree frogs is still limited. We determined two new mitogenomes for the genus (Rhacophoridae): and . We conducted comparative and phylogenetic analyses using our data and seven other rhacophorid mitogenomes. The mitogenomes of the genera , and were almost identical, except that the gene in had become a non-coding region; maintained the legacy "LTPF" tRNA gene cluster compared to the novel "TLPF" order in the other two genera; and and had no control region (CR) duplication. The resulting phylogenetic relationship supporting the above gene rearrangement pathway suggested parallel evolution of gene loss of function (LoF) in and CR duplication with concerted evolution of paralogous CRs in rhacophorids. Finally, conflicting topologies in the phylograms of 185 species reflected the advantages of phylogenetic analyses using multiple loci.

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