Imagine that there was a law which prevented 150 children a year suffering from a life threatening liver or kidney failure from receiving a transplant. This would be unethical. But this is precisely the current state of affairs for around 150 children every year in the UK suffering from mitochondrial disease, or mitochondrial failure.
From an ethical perspective, mitochondrial transfer is most accurately described as a form of transplantation, or “micro-organ” transplantation.