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Abstract
In this study, the complete mitochondrial genome of the hybrid of Megalobrama terminalis (♀) × Megalobrama amblycephala (♂) was determined. The total length of the genome was 16,622 bp in accordance with the female parent, and the overall base composition was 31.13% A, 24.94% T, 27.72% C and 16.21% G, with a slight A + T bias. The genome contained 13 protein-coding genes, 22 transfer RNA genes, 2 ribosomal RNA genes and 2 main non-coding regions (the control region and the origin of the light strand replication). The 99.48% sequence identity between the hybrid and its female parent, M. terminalis, confirmed the maternal inheritance pattern followed by the mitochondrial genome of the hybrid bream; however, it was interesting to find a total of 86 mutation sites in 12 genes or regions. The phylogenetic analysis indicated that the studied hybrid was relatively more close to M. terminalis, and the result was in agreement with their conventional taxonomic relationship. The genome information reported here may provide important information for further studies on the mitochondrial inheritance mechanisms in hybrids.
Declaration of interest
The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper. This work was financially supported by National Natural Science Foundation of China (No. 31472271), Modern Agriculture Industry Technology System Construction Projects of China titled as – Staple Freshwater Fishes Industry Technology System (No. CARS-46-05), Excellent Youth Foundation of Hubei Scientific Committee (No. 2013CFA032), Fundamental Research Funds for the Central Universities (No. 2013PY066 and 2014PY013) and National Training Programs of Innovation and Entrepreneurship for Undergraduates (201310504027).