Analysis of the characteristics of ten cartilaginous fishes mitochondrial genomes

Abstract:

The basic characteristics of chondrichthyes mitochondrial genomes were fully revealed by comprehensive analysis of mitochondrial genomes in ten cartilaginous fishes. Mitochondrial genomes of cartilaginous fishes contain 37 standard metazoan genes and their gene order is identical. The Ka/Ks ratio of 13 mitochondrial proteincoding genes in the Carcharhiniformes and Rajiformes classes is much lower than 1 (0.019 1~0.156 4), indicating a strong purifying selection (negative selection).