Scientists Turn Human Skin Cells into Eggs in Ground-Breaking Fertility Research

In a scientific advance that could reshape fertility treatment, researchers in the United States have successfully created human eggs from adult skin cells in a proof-of-concept laboratory study, raising hopes of new options for people unable to produce viable eggs naturally.

The work, led by a team at Oregon Health & Science University (OHSU), used a specialised technique involving somatic cell nuclear transfer — a method similar to that used in cloning — to transform a skin cell’s nucleus into a form that behaves like a natural egg cell.

How the technique works

Scientists removed the nucleus, which contains genetic material, from a skin cell donated by a volunteer and implanted it into a donor egg that had had its own nucleus removed. The modified cell was then chemically and electrically stimulated to trigger a process akin to natural meiosis — the cell division that halves chromosome number in egg formation.

The resulting cells displayed many characteristics of human eggs, and when fertilised with sperm in the laboratory, a small proportion developed into early embryos known as blastocysts. Around 9% of these fertilised cells reached the blastocyst stage, a key early milestone in embryo development, although none were viable for implantation.

“This study shows that it could be possible to produce fertilisable eggs from human skin cells, which could provide another option for those undergoing fertility treatment in the future,” said Tim Child, chair of the UK’s Human Fertilisation and Embryology Authority’s Scientific and Clinical Advances Advisory Committee. He stressed, however, that further research is required to address safety and effectiveness before such techniques could be considered for clinical use.

Potential and caution

Experts say the breakthrough, while promising, remains at an early stage. The process currently produces cells that are not yet equivalent to fully mature human eggs and requires refinement before any clinical application could be contemplated.

Prof Shoukhrat Mitalipov, who led the research in Portland, noted that the method might one day benefit women of advanced maternal age or those whose fertility has been compromised by chemotherapy. It could also, in theory, expand reproductive options for same-sex male couples by creating eggs from one partner’s cells.

However, some scientists caution that successes in early embryo formation should not be conflated with producing viable, fertile egg cells. Independent experts have underscored that what has been created in the lab are structures that resemble eggs, and much work remains to understand whether they can safely lead to pregnancy.

Ethical and regulatory landscape

The development highlights ongoing ethical debates surrounding reproductive science. Authorities such as the HFEA have indicated that technologies capable of generating gametes in vitro — a process known as in-vitro gametogenesis (IVG) — would require robust regulation if they progress toward clinical application.

For now, the study represents a significant step in reproductive biology and may provide scientists with powerful tools to better understand egg development, infertility mechanisms and early human embryo biology.

Whether the approach will ever lead to new fertility treatments, or how soon that may happen, remains uncertain, but the research has undoubtedly pushed the boundaries of what might one day be possible.