Journal
CURRENT BIOLOGY
Volume 21, Issue 1, Pages 45-52Publisher
CELL PRESS
DOI: 10.1016/j.cub.2010.11.049
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Funding
- Instituto de Salud Carlos III [CGCV-1335/07-3]
- National Institutes of Health [T32 CA009370]
- Fundacio CELLEX
- G. Harold and Leila Y. Mathers Charitable Foundation
- Sanofi-Aventis
- Ministerio de Ciencia e Innovacion
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Human embryonic stem (hES) cells show an atypical cell-cycle regulation characterized by a high proliferation rate and a short G1 phase [1,2]. In fact, a shortened G1 phase might protect ES cells from external signals inducing differentiation, as shown for certain stem cells [3]. It has been suggested that self-renewal and pluripotency are intimately linked to cell-cycle regulation in ES cells [4-6], although little is known about the overall importance of the cell-cycle machinery in maintaining ES cell identity. An appealing model to address whether the acquisition of stem cell properties is linked to cell-cycle regulation emerged with the ability to generate induced pluripotent stern (iPS) cells by expression of defined transcription factors [7-11]. Here, we show that the characteristic cell-cycle signature of hES cells is acquired as an early event in cell reprogramming. We demonstrate that induction of cell proliferation increases reprogramming efficiency, whereas cell-cycle arrest inhibits successful reprogramming. Furthermore, we show that cell-cycle arrest is sufficient to drive hES cells toward irreversible differentiation. Our results establish a link that intertwines the mechanisms of cell-cycle control with the mechanisms underlying the acquisition and maintenance of ES cell identity.
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