We achieved something that was thought to be impossible
At a laboratory in Oregon, scientists have done something that quietly reshapes the oldest boundary in human biology: they have grown embryos not from eggs, but from skin cells. The work, published in Nature Communications, does not yet touch clinical practice — it is a proof of concept, modest in its 9 percent success rate, but vast in what it implies. For the infertile, the aging, and those whose love has never fit the architecture of conventional reproduction, this moment marks the beginning of a long reckoning with what it means to create a life.
- For the first time, human embryos have been grown using skin cell DNA in place of an egg, a feat long considered beyond reach.
- The technique produced 82 functional eggs and yielded early embryos, but chromosomal errors and missing genetic shuffling reveal how fragile and incomplete the process still is.
- The potential beneficiaries are sweeping — infertile individuals, same-sex couples, older parents — but the gap between laboratory proof and clinical reality spans at least a decade.
- Experts are calling urgently for public dialogue and governance frameworks before the science outpaces society's ability to make sense of it.
- The field of in vitro gametogenesis remains entirely experimental, with no regulatory approval and serious unanswered questions about the long-term health of any children it might one day produce.
Researchers at Oregon Health and Science University have grown human embryos from skin cells — bypassing the egg entirely. The technique extracts the nucleus from a skin cell and inserts it into a donor egg whose own nucleus has been removed. A process called mitomeiosis then coaxes the skin cell into behaving like a reproductive cell. When fertilized with sperm, some of the resulting eggs developed into early embryos. None survived beyond six days, and the success rate was roughly 9 percent — but the concept has been proven.
The implications are wide. People whose bodies no longer produce eggs or sperm could use skin cells from both partners to create genetically shared embryos. Same-sex couples could, for the first time, have children biologically related to both parents. The ticking clock of reproductive aging could be silenced. Prof. Shoukhrat Mitalipov, who led the work, was candid about the distance still to travel: "We have to perfect it," he said, "but eventually, I think that's where the future will go."
The science carries real risks. The egg's chromosome-sorting process is imprecise — it can retain too many or too few copies, opening the door to disease. A critical step called crossing over, which normally shuffles genetic material between parents, is also missing from the current method. These are not minor technical footnotes; they are barriers that must be understood before any child could safely be born this way.
Experts outside the team have welcomed the advance while insisting on caution. Calls for robust governance and public accountability have been consistent. The researchers themselves estimate at least a decade before fertility clinics could offer anything like this. What has been removed, for now, is not a barrier to parenthood — it is a barrier to imagining that parenthood could one day look entirely different. The harder questions about whether and how society should walk through that door remain wide open.
Researchers at Oregon Health and Science University have accomplished what many thought impossible: they have grown human embryos from skin cells. The technique bypasses the need for an egg altogether, replacing it with genetic material harvested from a person's skin and then fertilizing the result with sperm. The breakthrough, published in Nature Communications, represents a fundamental shift in how scientists think about creating life in the laboratory.
The method works by taking the nucleus from a skin cell—the part that contains all the genetic instructions a person needs—and inserting it into a donor egg from which the nucleus has been removed. The team then applies a process called mitomeiosis, a hybrid of two natural cell-division mechanisms, to coax the skin cell into behaving like a reproductive cell. This approach echoes the technique used to create Dolly the sheep nearly three decades ago, but applied now to human reproduction. In their initial trials, the researchers produced 82 functional eggs. When these were fertilized with sperm, some developed into early embryos, though none progressed beyond six days of development. The success rate hovered around 9 percent—modest, but proof that the concept works.
The implications ripple outward in multiple directions. For people struggling with infertility, the technology offers a potential escape from biological constraints. A woman whose ovaries no longer produce eggs, or a man with a low sperm count, could theoretically use skin cells from either partner to create embryos that carry the genetics of both. Same-sex couples could, for the first time, have children who are genetically related to both parents—something impossible with current reproductive technologies. Older people who want to have children would no longer face the ticking clock of reproductive aging. The method democratizes parenthood in ways that existing fertility treatments cannot.
Yet the science remains rough. The egg cell, when it divides during this process, randomly decides which chromosomes to keep and which to discard. Sometimes it retains two copies of a chromosome when it should have one, or none when it should have one. This chromosomal imbalance can cause disease. Additionally, the process misses a crucial step called crossing over, in which genetic material from both parents normally gets shuffled together. Without this mixing, the resulting embryos lack genetic diversity in important ways. Prof. Shoukhrat Mitalipov, who directs the Centre for Embryonic Cell and Gene Therapy at Oregon Health and Science University, acknowledged the distance still to travel. "We have to perfect it," he said. "Eventually, I think that's where the future will go because there are more and more patients that cannot have children."
The work sits within a broader field called in vitro gametogenesis—the creation of sperm and eggs outside the body. It is still entirely experimental. Clinicians are not using this method. Regulators have not approved it. The researchers themselves estimate that at least a decade of additional work will be needed before the technique could be offered in fertility clinics. Safety concerns loom large. The chromosomal abnormalities that can arise from the random selection process need to be understood and mitigated. The long-term health of any children born from these embryos remains unknown.
Experts outside the research team have urged caution paired with openness. Prof. Paula Amato, also at Oregon Health and Science University, framed the breakthrough in measured terms: "In addition to offering hope for millions of people with infertility due to lack of eggs or sperm, this method would allow for the possibility of same-sex couples to have a child genetically related to both partners." Prof. Richard Anderson of the University of Edinburgh called it "a step towards helping many women have their own genetic children," while noting that "very important safety concerns" remain. Roger Sturmey, from the University of Hull, emphasized that breakthroughs of this magnitude demand "robust governance, to ensure accountability and build public trust."
What the scientists have done is remove a biological barrier that has stood for all of human history. Whether society is ready to walk through that door, and under what conditions, are questions that extend far beyond the laboratory.
Notable Quotes
We have to perfect it. Eventually, I think that's where the future will go because there are more and more patients that cannot have children.— Prof. Shoukhrat Mitalipov, Oregon Health and Science University
Such research reinforces the importance of continued open dialogue with the public about new advances in reproductive research. Breakthroughs such as this impress upon us the need for robust governance, to ensure accountability and build public trust.— Prof. Roger Sturmey, University of Hull
The Hearth Conversation Another angle on the story
Why does it matter that they used skin cells instead of eggs? Couldn't they have just used eggs the way they always do?
Because eggs are scarce. A woman is born with a finite number, and they decline with age. A man with low sperm count has no eggs at all. Skin cells, by contrast, are everywhere on your body and don't age the way reproductive cells do. That's the whole point—you're removing the biological clock.
But the success rate is only 9 percent. Isn't that too low to be useful?
For now, yes. But this is the first time anyone has done this at all. The researchers are proving the concept works, not that it's ready for patients. They're saying: this is possible. Now we need to make it reliable.
What's the chromosomal problem they keep mentioning?
When the egg divides, it's supposed to discard half its chromosomes so that when sperm arrives, the total is balanced. But in this process, the egg randomly decides which ones to throw away. Sometimes it keeps two copies of a chromosome when it should have one. That imbalance can cause genetic disease. It's a flaw in the method itself, not just a technical glitch.
Could this actually let same-sex couples have a child with both their genetics?
That's the promise. Right now, a same-sex couple can have a biological child, but only one parent's genetics appear in that child. With this technique, you could theoretically take skin cells from both partners, create eggs and sperm from them, and produce an embryo that carries DNA from both. It's never been done before.
When could this actually be available to people?
The researchers say at least ten years. And that's just to get it safe enough to try in clinics. There's no guarantee it will work as well in real patients as it does in the lab. There are also questions about whether regulators will even allow it, and what the long-term health effects might be.
So this is a breakthrough that's also a warning?
Exactly. It's a genuine scientific achievement. But it's also a moment where society needs to decide what it wants to do with this knowledge, and under what safeguards.