A high-efficiency system for the generation and study of human induced pluripotent stem cells.
A high-efficiency system for the generation and study of human induced pluripotent stem cells.
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DOI：
10.1016/j.stem.2008.08.003
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发表时间：
2008-09-11
期刊：
影响因子：
23.9
通讯作者：
Hochedlinger K
中科院分区：
文献类型：
--
作者：
Maherali N;Ahfeldt T;Rigamonti A;Utikal J;Cowan C;Hochedlinger K
Direct reprogramming of human fibroblasts to a pluripotent state has been achieved through ectopic expression of the transcription factors OCT4, SOX2, and either cMYC and KLF4 or NANOG and LIN28. Little is known, however, about the mechanisms by which reprogramming occurs, which is in part limited by the low efficiency of conversion. To this end, we sought to create a doxycycline-inducible lentiviral system to convert primary human fibroblasts and keratinocytes into human induced pluripotent stem (hiPS) cells. hiPS cells generated with this system were molecularly and functionally similar to human embryonic stem (hES) cells, demonstrated by gene expression profiles, DNA methylation status, and differentiation potential. While expression of the viral transgenes was required for several weeks in fibroblasts, we found that 10 days was sufficient for the reprogramming of keratinocytes. Using our inducible system, we developed a strategy to induce hiPS cell formation at high frequency. Upon addition of doxycycline to hiPS-derived differentiated cells, we obtained “secondary” hiPS cells at a frequency at least 100-fold greater than the initial conversion. The ability to reprogram cells at high efficiency provides a unique platform to dissect the underlying molecular and biochemical processes that accompany nuclear reprogramming.
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