There has been a huge amount of debate about so-called 'three parent babies' and rightly so - the development is both hugely impressive at a scientific and technical level, and is capable of improving the lives of families and children for generations to come.
About one child in a thousand suffers from one of the symptoms of faulty mitochondria, which can include severe neural disorders, heart problems, diabetes, deafness and blindness. Since mitochondrial DNA is passed unchanged from mother to children, once it is established in a family (through mutation or mitochondrial DNA damage), children and children's children can be affected in perpetuity. So changing the mitochondrial DNA will have a near-enough permanent effect on families and their children.
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