Abstract
Conferring stem-cell potential on mature cells is not easy. A decisive impediment to this process has now been identified, and its elimination allows almost all mature cells to efficiently adopt a stem-cell identity. See Article p.65 Somatic cells can be reprogrammed to pluripotency by expression of exogenous factors,classically Oct4, Sox2,Klf4 and c-Myc (OSKM). During reprogramming, only a fraction of the cells converts into induced pluripotent stem (iPS) cells. The nature of rate limiting barrier(s) that prevent the majority of cells to convert into iPS cells remains elusive and it is unknown whether iPS cell reprogramming can be rendered deterministic and very efficient. Jacob Hanna and colleagues now show that the combination of 2i/LIF growth conditions, OSKM overexpression and neutralizing the Mbd3/NURD co-repressor results in deterministic and synchronized reprogramming to pluripotency. Using this approach, they found that almost 100% of mouse and human somatic cells convert into naive iPS cells after only seven days of OSKM induction.
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