Types of Mitochondrial Diseases?

More than 40 different types of mitochondrial diseases known,each having different genetic features.Common factor among these diseases is that the mitochondria are unable to completely burn food and oxygen in order to generate energy.They are very rare and interestingly they are genetic diseases,and yet are very different to all other type of genetic diseases.Some of the common mitochondrial myopathies include Kearns-Sayre syndrome,myoclonus epilepsy with ragged-red fibers (MERRF), and mitochondrial encephalomyopathy lactic acidosis and stroke-like episodes(MELAS).