Human Fertilisation and Embryology (Mitochondrial Donation) Regulations 2015

Lord Turnberg Excerpts

Tuesday 24th February 2015 Lords Chamber

[Lord Patel]

“Dangerous”, my noble friend says. It killed the other two and resulted in a premature birth. They never published this, despite being asked if there was a publication. It is wrong to say that the HFEA did not ask them; the review panel did. Professor Grifo sent a letter saying that, in his view, all the foetuses were normal but they died of prematurity. What they died of was an obstetric botch-up. It had nothing to do with what we are talking about today. It was a completely different technique. We should dismiss it completely. It would be wrong to put any credence on it and say that it is a good reason why we should not do this.

I could go on about other safety aspects that were brought up, but let me close by saying that hitherto the science has gone as far as it can in thousands of animal experiments that have resulted in normal pups. In human embryos it has gone as far as it can to produce normal embryos, which, if implanted, there is no reason to believe would not develop into normal, healthy babies who would not carry the defective mitochondria. All we are doing today is allowing the regulator henceforth to decide, on a case-by-case basis, to issue a licence to those clinics for those mothers who request this treatment, and which are allowed to use both techniques that we currently know are safe while further research goes on. None of us stops researching: the noble Lord, Lord Winston, still carries on researching; the noble Lord, Lord Kakkar, still carries on researching. If a chance was given, the noble Lord, Lord Walton, would still carry on researching. We do not stop researching; that is the nature of medicine and of academic medical science. I hope that we will pass these regulations.

[Lord Turnberg (Lab)]

My Lords, I am extremely grateful to be able to follow the noble Lord, Lord Patel. I am also grateful to the noble Earl for setting out the issues so carefully at the beginning. I listened with great attention to the eloquent and persuasive speech from the noble Lord, Lord Deben, but I am afraid I was not persuaded. I cannot go along with the idea that we should put this regulation on hold for the time being. My reason is the awful position parents find themselves in when they have a child severely affected by one of these dreadful mitochondrial diseases. They are desperate to avoid having more children with the same disease. The noble Lord, Lord Deben, started from the same position but I believe that we are now in a position to move forward.

We have all been bombarded with information about mitochondria to the extent that few of us can be entirely ignorant of what they are and what they do. Yet there is still considerable room for confusion, at least according to some of the correspondence I have received. References to GM crops and cloned animals are way out of line. Suggestions that mitochondrial transfer techniques are a form of cloning when they are nothing of the sort, or that they are on the slippery slope to genetic manipulation and designer babies when there is no conceivable link between them, are very unhelpful and not part of any reasoned discussion about the issues. I could elaborate on that but will leave it for the moment to concentrate on what I think are the more rational arguments that have been and will be made today.

The noble Earl discussed the safety issues, as did the noble Lord, Lord Patel. The suggestion has been made that the techniques may not yet be safe enough. Let me take this a little further. The basic animal experiments have been going on since the 1980s and the specifics of maternal spindle and pronuclear transfer have been very fully researched for the last seven years. We have heard about the three thorough scientific reviews by expert panels set up by the HFEA. In each, further research that needed doing was suggested and each time the research has been actively and successfully pursued. On the last occasion, in 2014, they clearly stated that there were no major safety issues remaining. It is true that they suggested some further tests—and they are all under way, as we have heard—but they pointed to the fact that at the end of the day there will be no substitute for trying it in humans who carry the abnormal mitochondria.

In vitro studies in the test tube with human embryos after mitochondrial replacement have revealed no problems, and experiments with macaque monkeys—yes, they have been done—and maternal spindle transfer are all reassuring. It is interesting that monkeys are not suitable models for pronuclear transfer techniques because research shows that pronuclear transfer in vitro fails in monkeys but works perfectly well in human studies. The only way in which safety can be finally tested is in humans since no procedure or drug can be certainly safe without that. We have gone almost as far as we possibly can before that step is taken. We have heard some issues about the China syndrome, which I believe the noble Lord, Lord Patel, has dealt with perfectly well. Clearly, that was quite something else and not relevant to our discussions today.

Equally important is that these regulations do not simply allow human trials to start now—they do not; they allow the HFEA only to examine applications made to it for full assessment. It will then decide if the science is persuasive enough, that those proposing to do it have sufficient experience and capacity, and that the patients being put forward are clearly those likely to benefit. Remember that the HFEA is no pushover. It has in its membership not just three scientists and a clinical geneticist but three patients who have gone through IVF, a barrister, a professor of philosophy, a bishop and a national security adviser. That is quite an interesting mix but not one likely to be easily moved by faulty argument. It is they and their scientific advisory panel who will be assessing applications when these regulations come into force in October.

Other anxieties have been expressed that we will be disrupting the relationship between the nuclear and mitochondrial genes: the nuclear genes carry the information that determines all the characteristics that make us human, and the mitochondrial genes provide the energy supply for cells. This argument was discussed at great length in the HFEA’s scientific report in 2014 and was found wanting, not least because half the genes in a fertilised egg are derived from the father and are therefore already foreign to the mitochondria, yet they do not interfere with each other. Furthermore, mitochondrial genes are pretty well conserved between different individuals because they perform a limited number of functions, while there are large differences between the nuclear genes of different people, each of whom is made up of a mixture of DNA from a mother and a father.