In 10 seconds? Scientists have created a method to allow people with mitochondrial diseases to have children without passing on their pathology, which is normally transmitted by the mother through her mitochondrial DNA.
What is mitochondrial disease? The mitochondria are the cells' powerhouses, where most of the energy used by the cell is made. It contains its own DNA (mitochondrial DNA or mtDNA). Some mutations in this mtDNA can disrupt mitochondria, causing a decrease in energy production which can lead to disease.