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British MPs Approve 3-Parent Babies
An anonymous reader writes: A vote of 382-128 in the UK's House of Commons gave approval for a procedure that allows the creation of babies using DNA from three parents. If the measure passes the House of Lords and gets licensed by the fertility regulator, the UK would be the first country to allow such genetic engineering. The medical procedure was designed to help conception when genetic diseases could be passed through mitochondrial DNA. A child inherits mitochondria only from its mother, and these mitochondria have their own DNA, which doesn't affect things like the child's appearance.
The purpose of the procedure is to replace the mother's mitochondria, and that can happen in two different ways. In one method, doctors take eggs from the mother and from a donor, removing the nucleus of both. The mother's nucleus is then implanted in the donor's egg, which can then be fertilized by the father's sperm. The other method is similar, but both eggs are fertilized before the nucleus swap takes place.
There has been lively debate about this issue, with critics raising ethical concerns and questioning the procedure's success rate. They also bring up the slippery slope argument that this will lead to further genetic modification of children. Proponents point out that less than 0.1% of the child's DNA will come from the donor, and it won't affect anything other than the child's health.
The purpose of the procedure is to replace the mother's mitochondria, and that can happen in two different ways. In one method, doctors take eggs from the mother and from a donor, removing the nucleus of both. The mother's nucleus is then implanted in the donor's egg, which can then be fertilized by the father's sperm. The other method is similar, but both eggs are fertilized before the nucleus swap takes place.
There has been lively debate about this issue, with critics raising ethical concerns and questioning the procedure's success rate. They also bring up the slippery slope argument that this will lead to further genetic modification of children. Proponents point out that less than 0.1% of the child's DNA will come from the donor, and it won't affect anything other than the child's health.
Watching this 'debate', I've been unsurprised; but depressed, at the quality of 'argument' trotted out. The one that particularly annoys me is the "We can't allow it unless we know that it's totally safe and effective! What about possible side effects?!!".
Guess what, kids, there have been precious few medically relevant developments, ever, that came without some human risk. This doesn't imply endorsement of the Josef Mengele protocol for experimental ethics, it's just a fact that we've (so far, I'm all for somebody who can improve this) been unable to avoid, and even the most by-the-book-and-informed-consent contemporary clinical trials are subject to it to some degree. We can't exactly know if it's actually fully safe and effective in humans by use of animal models and pure reason.
Perhaps more importantly, this is a technique to treat disorders that cause grievous impairment and/or early, unpleasant, death. It has long been a commonplace of medical ethics(and simple commonsense decision making) that you don't want a cure worse than the disease; but that nasty diseases can have cures that you would welcome compared to that disease; but would be horrified by in the context of a less serious one(eg. basically all cancer treatment and most surgery). You calibrate your sense of risk based on what the alternatives are, not based on Ideal Perfect Risk Free. In the case of mitochondrial defects, the alternatives suck.
Finally, if you don't wish to allow treatment of mitochondrial defects(effective treatment, that is, there are various, mostly symptom-easing, treatments of not terribly impressive efficacy for the symptoms of mitochondrial disorders; but only swapping out mitochondria, or advanced and aggressive genetic engineering, show much hope for a cure); what do you propose? Do mitochondrially defective would-be-mothers get to roll the dice and hope for a less-sick baby? Do we start charging them with negligent homicide if they keep spawning horribly doomed offspring even after enough failures to know that trying again is dangerously likely to condemn their child to an ugly and swift death?
If you are concerned about 'germline' genetic engineering, this somewhat-uncomfortably-retro 'eugenic' proposal is the other viable option to preventing mitochondrial disease; but I'm guessing that it won't be too popular.
(All that said, I hope that the treatment does work as well as its backers hope, and doesn't turn out to suffer from the drawbacks its critics fear, and if it does turn out to be too dangerous/imperfectly effective, I think that it should go back to the drawing board; but these phantoms of 'need to know for sure that it works' and 'must be proven safe' seem like disgustingly transparent rhetorical devices, not serious ethical arguments.)