A significant step has just been taken towards creating human embryos from ordinary skin cells. When combined with recent advances in artificial wombs, this may completely alter the way we think about having children. The Oregon Health & Science University has achieved a groundbreaking feat in the field of fertility treatment. They have successfully transformed human skin cells into functional eggs, a feat that was once confined to the realms of science fiction. These eggs were then fertilised with sperm, resulting in early embryos. Despite still being in its infancy, the technology marks a massive step forward for fertility treatment.
So, how are these eggs created? It all begins with an incredibly ordinary sample of skin cells taken from an individual’s arm. Each of these cells contains the person’s genetic code in its nucleus. Human DNA is made up of 46 chromosomes, which are carefully extracted from the nucleus. A donated human egg is taken from a volunteer, and its nucleus is removed, leaving behind an empty egg cell. Not only does the cell contain all the necessary molecular machinery and nutrients for early development, but it is also unique; when the skin cell nucleus is placed into this emptied egg, something remarkable happens.
Cells can be reprogrammed by the powerful biological signals contained in the egg’s internal environment. Skin cell nuclei are basically told to forget they’re skin cells and start behaving like eggs instead. Usually, ovaries are the only place where the nucleus undergoes transformation. A cell undergoes meiosis, a special type of cell division where chromosomes pair up and separate, resulting in 23 instead of 46. As a result, when an egg with 23 chromosomes meets sperm with 23 chromosomes, the resulting embryo will have 46 chromosomes, half from each parent. The two people are not clones, but real genetic combinations.
The study conducted in Oregon used this technique to create 82 eggs. After fertilising them with sperm, they watched as some started dividing, indicating embryonic development. While IVF is a relatively common procedure, only about 9% of embryos reach the blastocyst stage, when they are ready for implantation into the uterus.
There is currently a significant problem with the organisation of chromosomes in this technology. There is a great deal of precision in chromosome behaviour in natural eggs. Line them up carefully, pair them with their corresponding partners, and separate them cleanly. The chromosomes in each egg are duplicated precisely this way. This process goes wrong in lab-created eggs. There is a scattering of chromosomes instead of a proper organisation. It is possible for some eggs to have too many copies of certain chromosomes, while others may have too few copies. As a result of fertilising these eggs, the resulting embryos have genetic abnormalities that would prevent them from developing into healthy children.
“We weren’t satisfied with the outcome, really, but it was proof-of-concept. Hey, we can do this now,” explains Paula Amato, one of the study’s co-authors.
Researchers stopped the experiment at the early stages and did not implant any of these embryos. But the fact that they got this far is significant. Just a few years ago, many scientists thought creating eggs from adult cells would be impossible.
But who could benefit from this groundbreaking research? The potential to transform infertility treatment is immense, particularly if scientists can overcome the challenges related to chromosome organisation. Individuals who no longer produce viable eggs, whether due to age, genetics, or medical conditions, currently have their choices limited to using frozen eggs or embryos from an earlier time, which, for many, is not a viable option. However, this research could theoretically be used to create fresh, healthy eggs from a person’s own skin cells, regardless of their age.
Cancer survivors could gain a great deal of benefits as well. It is common for chemotherapy and radiation treatments to destroy eggs, leaving many people infertile. Many people can freeze eggs or embryos before therapy, but others cannot due to time constraints or illnesses. This research offers the possibility of creating new eggs from skin cells, providing a second chance at biological parenthood. In addition, same-sex couples, including same-gender male couples, could also benefit. An egg could be created from one partner’s skin cells, while sperm from the other, allowing both partners to have a genetically related child.
Researchers estimate that it will take at least another decade of intensive study before this technique can be tested on humans. They must first understand why chromosomes sometimes misalign and develop reliable methods to correct these errors.
The current goal, however, isn’t to replace pregnancy altogether, but rather to save babies born prematurely. Due to their inability to function in the open air, babies born between 22 and 24 weeks have very low survival rates. They also have highly underdeveloped skin, digestive system, and brain. Even though neonatal intensive care units (NICUs) do their best, they are not equipped for such fragile infants. Little lungs can be damaged by ventilators, and the dark and harsh lights of a NICU can impair brain development. It would be possible to provide these premature babies with a safer, womb-like environment before they are born if artificial wombs were available.
Regulatory and testing issues for these devices have already been discussed by the U.S. Food and Drug Administration. Trials on humans are expected to begin within the next few years – but only in cases of medical emergencies where babies wouldn’t otherwise survive.
Our future vision of human reproduction could be redefined entirely when these two technologies are combined. It could eventually be possible for someone who, with today’s treatment, is infertile to create eggs using their skin cells, fertilise them with sperm in a lab, and then allow the embryo to develop inside an artificial womb for nine months. This concept, called complete ectogenesis, would enable people to have genetically related children without having to get pregnant. There is excitement and unease associated with this idea. It represents hope for people who are unable to carry a pregnancy. However, it also raises profound questions about parenthood, reproduction, and human identity.
Although remarkable progress has been made, this vision remains far from reality. Current processes for creating eggs from skin cells result in mostly defective embryos. The artificial womb has not been able to support fully developed animal foetuses from conception to birth.
According to experts, ectogenesis may not be complete for 20–30 years, without accounting for the technical, safety, and ethical challenges that must also be overcome. The technology must be proven safe, reliable, and responsibly managed before it can be used in humans.
We’re witnessing the early stages of what could become a revolution in human reproduction. Scientists have shown that creating eggs from skin cells is possible in principle, and artificial wombs are advancing rapidly to help premature babies survive. Together, they could one day offer new paths to parenthood for millions struggling with infertility.
However, it’s important to stay realistic. The science is still developing, the ethics are complex, and progress will take decades. For now, these innovations will remain in the realm of controlled research exploring the boundaries of what can be done, while society debates what should be done.
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