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Abstract
The circular mitochondrial genomes of Brachymystax lenok and B. lenok tsinlingensis are 16,832 and 16,669 bp in length, respectively. The mitogenomes of two lenoks shared common features with those of other teleosts in terms of gene arrangement, base composition, and transfer RNA structures. The two genomes have an overall nucleotide sequence identity of 98.3%. Through the comparisons between the two lenoks, we found their gene arrangement, composition, and sizes are the same, and the A+T content is identical. As with other freshwater salmonids, a T-type mononucleotide microsatellite and various tandem repeats were identified in the control regions of the lenoks. The low pairwise distance (2.1%) inferred from 12 mitochondrial protein-coding genes on heavy strand showed close proximity of B. lenok and B. lenok tsinlingensis.
Acknowledgements
This research was funded by the Sichuan Youth Science and Technology Foundation (No. 08ZQ026-019), the Special Fund for Agro-scientific Research in the Public Interest (No. 201003055), and Central-Level Non-profit Scientific Research Institutes Special Funds (Nos 201002 and 201102). We would like to thank the Heilongjiang River Fishery Research Institute of Chinese Academy of Fishery Sciences and Mr Qingliang Sun for providing the samples of B. lenok and B. lenok tsinlingensis, respectively.
Declaration of interest: The authors report no conflict of interest. The authors alone are responsible for the content and writing of the paper.