Could we one day make babies from only skin cells? – CNN
By daniellenierenberg
In 2016, scientists in Japan revealed the birth of mice from eggs made from a parent's skin cells, and many researchers believe the technique could one day be applied to humans.
The process, called in vitro gametogenesis, allows eggs and sperm to be created in a culture dish in the lab.
Though most scientists agree we're still a long way off from doing it clinically, it's a promising technology that has the potential to replace traditional in vitro fertilization to treat infertility.
If and when this process is successful in humans, the implications would be immense, but scientists are now raising legal and ethical questions that need to be addressed before the technology becomes a reality.
In vitro gametogenesis, or IVG, is similar to IVF -- in vitro fertilization -- in that the joining of egg and sperm takes place in a culture dish.
Trounson believes IVG can provide hope for couples when IVF is not an option.
This procedure can "help men or women who have no gametes -- no sperm or eggs," said Trounson, a renowned stem cell scientist best known for developing human IVF with Carl Wood in 1977.
Another potential benefit with IVG is that there is no need for a woman to receive high doses of fertility drugs to retrieve her eggs, as with traditional IVF.
In addition, same-sex couples would be able to have biological children, and people who lost their gametes through cancer treatments, for instance, would have a chance at having biological children.
In theory, a single woman could also conceive on her own, a concept that Sonia M. Suter, professor of law at George Washington University, calls "solo IVG." She points out that it comes with some risk, as there will be less genetic variety among the babies.
She added that the risk is even greater than with cloning and although you could use genetic diagnosis to find disease in embryos before implantation, it wouldn't fully reduce the risk.
This all contributes to the fact that IVG is much more complicated than one might think, and experts add that the process will be even more complex in humans than in mice.
"It's a much tougher prospect to do this in a human -- much, much tougher. It's like climbing a few stairs versus climbing a mountain," Trounson said.
"Gametogenesis (in a mouse) is much faster. Everything is much faster and less complicated than you have in a human. So you've got to make sure there's very long intervals to get you the right outcome. ... Life, gametogenesis, everything, is much, much briefer than it is in a human."
Most scientists are reluctant to commit to an exact time frame, but it's probably safe to say they're many years away.
Knoepfler used the example of an unapproved and, he says, potentially dangerous three-person baby produced in Mexico in 2016 by a US doctor without FDA approval.
Creating a three-person baby involves a process known as pronuclear transfer, in which an embryo is created using genetic material from three people -- the intended mother and father and an egg donor -- to remove the risk of genetic diseases caused by DNA in a mother's mitochondria. The mitochondria are parts of a cell used to create energy but also carry DNA that is passed on only through the maternal line.
This process recently received approval in the UK, but it remains illegal in many countries, including the US.
"Because it seems rogue biomedical endeavors are on the increase, someone could try IVG without sufficient data or governmental approval in the next five to 10 years," Knoepfler said.
"IVG takes us into uncharted territory, so it's hard to say legal issues that might come up," he said, adding that "even other more extreme technologies, such as cloning, of the reproductive kind are not technically prohibited in the US."
For IVG to be researched further, it will be necessary to perform IVF using the derived gametes and then to study the embryos in ways that would involve their destruction. "At a minimum, federal funding could not be used for such work, but what other laws might come into play is less clear," Knoepler said.
In several countries, the implantation of a fertilized egg is not allowed if it's been maintained longer than 14 days.
Dr. Mahendra Rao, scientific adviser with the New York Stem Cell Foundation, explained that in the US, scientists can legally make sperm and oocytes (immature eggs) from other cells and perform IVF. But they would not be able to perform implantation, even in animals.
He said there needs to be clarity that this rule doesn't apply to "synthetic" embryos scientists are building in culture, where there's no intention of implanting them.
Daley and his co-authors highlight concerns over "embryo farming" and the consequence of parents choosing an embryo with preferred traits.
"IVG could, depending on its ultimate financial cost, greatly increase the number of embryos from which to select, thus exacerbating concerns about parents selecting for their 'ideal' future child," they write.
With a large number of eggs available through IVG, the process might exacerbate concerns about the devaluation of human life, the authors say.
Also worrying is the potential for someone to get hold of your genetic material -- such as sloughed-off skin cells -- without your permission. The authors raise questions about the legal ramifications and how they would be handled in court.
"Should the law consider the source of the skin cells to be a legal parent to the child, or should it distinguish an individual's genetic and legal parentage?" they ask.
As new forms of assisted reproductive technology stretch our ideas about identity, parentage and existing laws and regulations around stem cell research, researchers highlight the need to address these thoughts and have answers in place before making IVG an option.
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Could we one day make babies from only skin cells? - CNN
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