A method based on the improved inter-nucleotide distances of genomes to construct vertebrates phylogeny tree

DNA sequences consist of four types of nucleotides, and converting the DNA sequence into a numerical sequence is an important task of the study of DNA sequences. In this paper, we propose an improved inter-nucleotide distances method which combines with Euclidean distance to analyze phylogenetic relationship of the 64 vertebrate complete mitochondrial genomes and construct corresponding phylogenetic trees. The trees show that the mitochondrial genomes are separated into three major groups. One group corresponds to mammals, one group corresponds to fish, and the other one is Archosauria (including birds and retiles). Finally, our results are roughly consistent with the current known phylogenies of vertebrates.