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Updated: Sep 27, 2026

Derivation of Adult Human Fibroblasts and their Direct Conversion into Expandable Neural Progenitor Cells
Published on: July 29, 2015
Multipotentiality of neuronal cells after spontaneous fusion with embryonic stem cells and nuclear reprogramming in
Steve Pells1, Alexandra I Di Domenico, Ed J Gallagher
1Roslin Institute (Edinburgh), Roslin, Midlothian, United Kingdom.
Abstract:
Primary mouse brain cells were cultured with HPRT (hypoxanthine phosphoribosyl transferase)-deficient ES (embryonic stem) cells to see if the ES cells could provide cues sufficient to reprogram a pluripotential state. After 5 days of coculture, HPRT-deficient ES cells were killed by selection in HAT (hypoxanthine, aminopterin, thymidine) medium. We observed islands of HAT-resistant ES-like cells surrounded by differentiated cells. Cell lines generated from three such "islands" proved to be spontaneous, pluripotential ES-neural hybrids, and gave rise to a chimera following blastocyst injection. Re-expression of the ES-specific gene Foxd3 from somatic-derived chromosomes suggested that the somatic nucleus had been reprogrammed. Our results raise the intriguing possibility that ASCs shown to contribute to multiple tissues in blastocyst-injection studies may not contribute as a result of pluripotency. Instead contributions may arise from spontaneous fusion events in which phenotype is determined by either cytoplasmic dominance, nuclear reprogramming, or both.
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