Three-Parent IVF Deserves a Chance in the U.S.

TIME Ideas health Three-Parent IVF Deserves a Chance in the U.S. All new fertility methods sound crazy at first

In a historic vote that rocked the world of fertility medicine Tuesday, British lawmakers approved the use of a controversial IVF practice that would take genetic material from three people to create a single embryo.

The promising technique, which involves replacing the defective cellular material of a womans eggs with that from a healthy donor, aims to prevent patients from passing down crippling genetic diseases to their offspring. It also might hold the key to other groundbreaking applications, such as extending womens fertility by rehabilitating old eggs.

The decision is inspiring because members of Parliament chose science over a firestorm of often ill-informed debate questioning whether weve gone too far in experimenting with genetic engineering. Hopefully, they will motivate the U.S. Food and Drug Administration, which held public hearings on the topic last year but declined to move forward with human trials citing lack of safety data, to follow suit. New research published in the New England Journal of Medicine estimated that more than 12,000 women in the U. S. of childbearing age risk passing down such mitochondrial diseases, which have been linked to everything from poor growth, blindness, neurological problems and heart and kidney problems.

The world is right to be cautious about this latest mind-boggling advance in reproductive medicine. It does sound like science fiction: If youre a woman who suffers from a mutation in her mitochondrial DNAthe part of our cells that generate energyscientists can take your egg, extract the nucleusthe part containing your most important genetic instructions, such as hair and eye colorand insert it into a new egg that has been provided by another woman. (The nucleus would have already been removed from the donor egg.) This newly renovated egg is then fertilized by your partners sperm and implanted into your uterus. You carry on with your pregnancy, just like billions of women before you. (Another version of the technique switches out the nucleus of a newly fertilized egg.)

Have we pushed the boundaries too far in innovative baby-making? Think back to when critics charged that the inventors of in-vitro fertilization recklessly played God by daring to combine a sperm and an egg in a lab to create Louise Brown in 1978. Now some 5 million of the worlds babies have been conceived via IVF. But its one thing to get used to combining reproductive parts in a lab; its a lot less comfortable to imagine tinkering with those parts beforehand. In an open letter to the U.K. Parliament, Paul Knoepfler, stem cell and developmental biology researcher at the University of California Davis School of Medicine, warned that supporters could well find themselves on the wrong side of history with horrible consequences.

Yet its important to understand that mitochondrial replacement isnt genetic engineering run amok, cautions Debra Mathews of the Berman Institute of Bioethics at Johns Hopkins University. The mitochondrial energy-making material of an egg accounts for a mere 37 genes, compared to the nucleus, which contains about 23,000 genes. No one is messing directly with genes, she says. Scientists are replacing damaged mitochondria with healthy mitochondria. Its a specific technology for a specific application. Were modifying eggs to avoid serious diseases. So far, researchers havent attempted a pregnancy using the technique, but a study published in 2012 in Nature found that resulting embryos appeared to develop normally with the nucleus intact and did not contain any of the mutated mitochondria from patients previous eggs. And scientists at Oregon Health and Science University transferred the mitochondria between rhesus-monkey eggs and created four healthy monkey babies.

Yet determining when a technology is safe is especially challenging in fertility medicine because the only way to find out is to create another human. The FDAs prudence is a welcome change from the early wild west days of reproductive medicine when many scientists implanted and prayed that their experiments wouldnt lead to the horrible consequences Knoepfler is warning against. So far, weve been incredibly lucky.

We dont want to risk holding up progress by being too cautious, especially when some 1,000 to 4,000 babies are estimated to be born every year with mitochondrial disease, according to the United Mitochondrial Disease Foundation.

Yet what should the threshold be? The FDA shut down other such research being done more than a decade ago. Scientists at several fertility clinics were responsible for 30 pregnancies from eggs that had been injected with donor cytoplasm that contained mitochondria. The kids havent been tracked over the long term, and its unknown whether the procedure contributed to two cases of chromosomal abnormalities that resulted in one miscarriage and one abortion. And researchers at New York Universitys Langone Medical Center tried a similar mitochondrial transfer technique using younger eggs for three women in their 40s suffering from age-related infertility. Although the embryos developed naturally, none got pregnant. A Chinese team later used the NYU method to achieve a triplet pregnancy, but the patient lost the entire pregnancy after she tried to abort one fetus to give the other two a better chance of survival.

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Three-Parent IVF Deserves a Chance in the U.S.