How did somatic cell nuclear transfer contribute to research on induced pluripotent stem cells?

Somatic cell nuclear transfer (SCNT) was instrumental in the development of induced pluripotent stem cells (iPS cells) by providing foundational evidence that adult somatic cells could be reprogrammed to a primitive, stem-like state.1

In the 1990s, the work of British biologist Ian Wilmut and his team, who successfully used SCNT to create Dolly the sheep, confirmed that factors within the egg cytoplasm were capable of reprogramming a differentiated nucleus. This discovery built upon earlier research by John B. Gurdon, who had demonstrated similar reprogramming in frogs.21

These SCNT experiments established the critical proof of principle that the genetic material of a mature cell is not permanently fixed and can be returned to a pluripotent state. This insight directly inspired researchers like Shinya Yamanaka to identify the specific genes and proteins responsible for this reprogramming, eventually leading to the creation of iPS cells without the need for eggs or embryos.13