Generating gametes from nonreproductive tissues could help overcome infertility. Previous studies have successfully transformed stem cells into viable oocytes through cellular reprogramming. Scientists at Oregon Health & Science University (OHSU) developed a method to derive them from skin cells via somatic cell nuclear transfer (SCNT), unlocking a mechanism that blends mitosis and meiosis. Now, the researchers have taken another step forward by generating fertilizable eggs from human skin cells.

The family trees of different cell types from different tissues and organs have been traced back to the fertilized egg that gave rise to the human body of which the cells formed a part, establishing a baseline for “normal” development and aging that could help improve understanding of the onset of disease.