Characterization, Comparison of Two New Mitogenomes of Crocodile Newts ITylototriton/I , and Phylogenetic Implications

Mitochondrial genomes (mitogenomes) are valuable resources in molecular and evolutionary studies, such as phylogeny and population genetics. The complete mitogenomes of two crocodile newts, Tylototriton broadoridgus and Tylototriton gaowangjienensis, were sequenced, assembled, and annotated for the...

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Bibliographic Details
Published in:Genes 2022-10, Vol.13 (10)
Main Authors: Wang, Jin-Xiu, Lan, Xiang-Ying, Luo, Qing-Hua, Gu, Zhi-Rong, Zhou, Qiang, Zhang, Ming-Yao, Zhang, You-Xiang, Jiang, Wan-Sheng
Format: Article
Language:English
Subjects:
Analysis
DNA sequencing
Genetic aspects
Genomics
Identification and classification
Methods
Natural history
Newts
Nucleotide sequencing
Phylogeny
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Summary:Mitochondrial genomes (mitogenomes) are valuable resources in molecular and evolutionary studies, such as phylogeny and population genetics. The complete mitogenomes of two crocodile newts, Tylototriton broadoridgus and Tylototriton gaowangjienensis, were sequenced, assembled, and annotated for the first time using next-generation sequencing. The complete mitogenomes of T. broadoridgus and T. gaowangjienensis were 16,265 bp and 16,259 bp in lengths, which both composed of 13 protein-coding genes (PCGs), 2 rRNA genes, 22 tRNA genes, and 1 control region. The two mitogenomes had high A + T content with positive AT-skew and negative GC-skew patterns. The ratio of non-synonymous and synonymous substitutions showed that, relatively, the ATP8 gene evolved the fastest and COI evolved the slowest among the 13 PCGs. Phylogenetic trees from BI and ML analyses resulted in identical topologies, where the Tylototriton split into two groups corresponding to two subgenera. Both T. broadoridgus and T. gaowangjienensis sequenced here belonged to the subgenus Yaotriton, and these two species shared a tentative sister group relationship. The two mitogenomes reported in this study provided valuable data for future molecular and evolutionary studies of the genus Tylotoriton and other salamanders.
ISSN:2073-4425
2073-4425
DOI:10.3390/genes13101878