'Three-parent babies' cure for illness raises ethical fear
Mitochondrial disease, passed from mother to child, is
incurable. Scientists see a way to eliminate it using donor DNA
but this has set off a debate about 'three-parent babies'
turnbull mitochondrial disease Doug Turnbull, professor of
neurology at Newcastle University: 'If you talk to families with
mitochondrial disease, the one thing they want is a lower risk
of having an affected child.' Photograph: Christopher Thomond
for the Guardian Christopher Thomond/Guardian  Aaron began to
stand out at primary school. He was unlike other children in
subtle ways that at times were hard to put a finger on. He
couldn't hold a pen properly. His balance was a little poor. He
just seemed different from his classmates.  There is no subtlety
to Aaron's condition any more. At the end of each day he gets so
tired he resorts to a wheelchair. He wears a small heart monitor
in his chest after collapsing a couple of times without warning.
Soon he will need a kidney trans