Nearly 40 years after the world was jolted by the birth of the first test-tube baby, a new revolution in reproductive technology is on the horizon — and it promises to be far more controversial than in vitro fertilization ever was.
Within a decade or two, researchers say, scientists will likely be able to create a baby from human skin cells that have been coaxed to grow into eggs and sperm and then used to create embryos that can be implanted in a womb.
The process, called in vitro gametogenesis, or IVG, so far has been used only in mice. But stem cell biologists say it is only a matter of time before the procedure could be used in human reproduction — opening up mind-boggling possibilities.
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With IVG, two men could have a baby that was biologically related to both of them, by using skin cells from one to make an egg that would be fertilized by sperm from the other. Women with fertility problems could have eggs made from their skin cells, rather than go through the lengthy and expensive process of stimulating their ovaries to retrieve their eggs.
“It gives me an unsettled feeling because we don’t know what this could lead to,” said Paul Knoepfler, a stem cell researcher at the University of California, Davis. “You can imagine one man providing both the eggs and the sperm, almost like cloning himself. You can imagine that eggs becoming so easily available would lead to designer babies.”
Some scientists are even talking about what they call the “Brad Pitt scenario” when someone retrieves a celebrity’s skin cells from a hotel bed or bathtub. Or a baby might have what one law professor called “multiplex” parents.
“There are groups out there that want to reproduce among themselves,” said Sonia Suter, a George Washington University law professor who began writing about IVG even before it had been achieved in mice. “You could have two pairs who would each create an embryo, and then take an egg from one embryo and sperm from the other, and create a baby with four parents.”
Three prominent academics in medicine and law sounded an alarm about the possible consequences in a paper published this year.
“IVG may raise the specter of ‘embryo farming’ on a scale currently unimagined, which might exacerbate concerns about the devaluation of human life,” Eli Adashi, a medical science professor at Brown; Glenn Cohen, a Harvard Law School professor; and George Daley, dean of Harvard Medical School, wrote in the journal Science Translational Medicine.
Still, how soon IVG might become a reality in human reproduction is open to debate.
“I wouldn’t be surprised if it was 5 years, and I wouldn’t be surprised if it was 25 years,” said Jeanne Loring, a researcher at the Scripps Research Institute, who, with the San Diego Zoo, hopes to use IVG to increase the population of the nearly extinct northern white rhino.
Loring said that when she discussed IVG with colleagues who initially said it would never be used with humans, their skepticism often melted away as the conversation continued. But not everyone is convinced that IVG will ever become a regularly used process in human reproduction — even if the many ethical issues are resolved.
“People are a lot more complicated than mice,” said Susan Solomon, chief executive of the New York Stem Cell Foundation. “And we’ve often seen that the closer you get to something, the more obstacles you discover.”
IVG requires layers of complicated bioengineering. Scientists must first take adult skin cells — other cells would work as well or better, but skin cells are the easiest to get — and reprogram them to become embryonic stem cells capable of growing into different kinds of cells.
Then, the same kind of signaling factors that occur in nature are used to guide those stem cells to become eggs or sperm. (Cells taken from women could be made to produce sperm, the researchers say, but the sperm, lacking a Y chromosome, would produce only female babies.)
Last year, researchers in Japan, led by Katsuhiko Hayashi, used IVG to make viable eggs from the skin cells of adult female mice, and produced embryos that were implanted into female mice, who then gave birth to healthy babies.
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