To Get Rid Of Mitochondrial Diseases, Just Edit Them Out Of DNA | Popular Science

"...Unlike nucleic DNA, mitochondrial DNA comes only from a baby’s mother and has no control over the baby’s physical characteristics. Mitochondria are the organelles inside cells that are often referred to as “powerhouses” of the cell. Mutations in their DNA can prevent cells from generating the right amount of energy, leading to diseases like muscular dystrophy and organ failure. There is no cure for mitochondrial disease, so DNA manipulation seems like a pretty promising solution..."
http://www.popsci.com/get-rid-mitochondria-diseases-just-edit-them-out-dna