Breakthrough in Fertility: Human Eggs Created from Skin Cells

Researchers at Oregon Health and Science University (OHSU) have achieved a significant milestone in reproductive science by successfully creating human eggs from adult skin cells. This groundbreaking study, published in *Nature Communications*, demonstrates the potential for developing fertilizable eggs that could help women facing infertility due to age or medical conditions, as well as same-sex couples wishing to have genetically related children.

Scientists Turn Human Skin DNA into Early-Stage Embryos

The process involves a technique known as somatic cell nuclear transfer (SCNT), which was famously used to clone Dolly the sheep. In this study, scientists removed the nucleus from a donor egg and replaced it with the nucleus from a skin cell, which contains a full set of 46 chromosomes. To create a functional egg, the researchers developed a method called "mitomeiosis," which mimics natural cell division and reduces the chromosome count from 46 to 23, making it compatible for fertilization with sperm.

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The OHSU team successfully produced 82 functional oocytes, which were then fertilized in vitro. However, only about 9% of these fertilized eggs developed to the blastocyst stage, the point at which embryos are typically transferred to the uterus during in vitro fertilization (IVF). Most embryos exhibited chromosomal abnormalities, which could hinder normal development. Dr. Paula Amato, a co-author of the study, emphasized that these embryos would not be expected to result in healthy babies.

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The researchers acknowledged that significant challenges remain, particularly in ensuring the correct pairing and separation of chromosomes during the egg formation process. Experts like Amander Clark from UCLA cautioned that the current technology is not yet suitable for clinical application due to the genetic abnormalities observed.

CNN

The implications of this research are profound. If perfected, the technique could provide a solution for millions of women who cannot produce viable eggs, including those who have undergone cancer treatment or are of advanced maternal age. Additionally, it opens the door for same-sex male couples to have children genetically related to both partners by using skin cells from one partner to create an egg and fertilizing it with sperm from the other.

Babies could be created without a biological mother after scientific ‘breakthrough’

Experts in reproductive medicine, such as Ying Cheong from the University of Southampton, have called this work an "exciting proof of concept." However, they stress that further research is necessary to address safety and efficacy concerns before clinical trials can begin, which may take at least a decade.

Reuters

The potential for this technology raises ethical questions, particularly regarding the possibility of creating "designer babies" or using skin cells from individuals without their consent. Bioethicists like Ronald Green from Dartmouth College have highlighted the need for robust governance and public dialogue as the field progresses.

NPR

While the creation of human eggs from skin cells represents a remarkable advance in reproductive technology, it remains in the early stages of development. The OHSU team's findings pave the way for future research that could transform fertility treatments and expand family-building options for many individuals and couples facing infertility challenges.

Scientists Turn Human Skin DNA into Early-Stage Embryos