A general trend for invertebrate mitochondrial genome evolution

Exploring DNA and protein evolution is very basic research. Here, 60 sets of invertebrate mitochondria were selected; whose entire genome sequences, protein-coding DNA and proteins sequences evolution were studied. The results were interesting. For the whole mitochondrial genome evolution, the AT content is increasing and GC is reducing during the life evolution going. The net ratio of AT content creation to GC deletion was about 4/3. For protein-coding DNA evolution, the TG contents were increasing and AC contents were consistently reducing. These results were firstly reported. For mitochondrial genome protein evolution, ten amino acids losers and ten amino acids gainers were found, which was difference with previous reports.