Cloned human embryonic stem cells

Researchers have created embryonic stem cells from human embryos that they created in the lab themselves. The new cloned stem cells were generated in a couple of months versus 4 months for current methods.

Journal Cell – Human Embryonic Stem Cells Derived by Somatic Cell Nuclear Transfer

Highlights
* Cytoplasm of human oocytes reprograms transplanted somatic cell nuclei to pluripotency
* NT-ESCs can be efficiently derived from high-quality human oocytes
* Human NT-ESCs are similar to ESCs derived from fertilized embryos

Summary

Reprogramming somatic cells into pluripotent embryonic stem cells (ESCs) by somatic cell nuclear transfer (SCNT) has been envisioned as an approach for generating patient-matched nuclear transfer (NT)-ESCs for studies of disease mechanisms and for developing specific therapies. Past attempts to produce human NT-ESCs have failed secondary to early embryonic arrest of SCNT embryos. Here, we identified premature exit from meiosis in human oocytes and suboptimal activation as key factors that are responsible for these outcomes. Optimized SCNT approaches designed to circumvent these limitations allowed derivation of human NT-ESCs. When applied to premium quality human oocytes, NT-ESC lines were derived from as few as two oocytes. NT-ESCs displayed normal diploid karyotypes and inherited their nuclear genome exclusively from parental somatic cells. Gene expression and differentiation profiles in human NT-ESCs were similar to embryo-derived ESCs, suggesting efficient reprogramming of somatic cells to a pluripotent state.

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