Unknown,Transcriptomics,Genomics,Proteomics

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Dys and Eureprogramming

ABSTRACT: Pluripotent stem cells have the potential to differentiate in vitro in many, if not all, functional cell types. Induced pluripotent stem cells (iPS) have recently emerged as a reproducible model of pluripotent stem cells that can be generated from post-natal tissues. To understand this process at the transcriptome level, we generated iPS cell lines, partially reprogrammed cell lines and compared their transcriptome with that of the partental human foreskin fibroblasts and human embryonic stem cell lines. Four categories of samples, comprising human foreskin fibroblasts, fully reprogrammed iPS cell lines, partially reprogrammed iPS cell lines and human embryonic stem cell lines were compared using Significance Analysis of Microarrays (SAM). These data were also compared to a compendium of differentiated human samples and a pluripotency classifier was computed.

ORGANISM(S): Homo sapiens

SUBMITTER: John De Vos

PROVIDER: E-GEOD-18147 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Ten-eleven translocation (TET) family enzymes can convert 5-methylcytosine (5mC) into 5-hydroxymethylcytosine (5hmC) in DNA and have been proposed as potential DNA demethylase candidates1. Evidences from recent studies indicated that Tet1 is predominantly expressed in ES cells and plays dual functions in promoting transcription of pluripotency genes and as well as participating in the repression of developmental genes by facilitating recruitment of PRC21-5. These studies further raised the possibility that Tet1 might play a role in somatic cell reprogramming. Here, we provide evidence showing that Tet1 can substitute for pluripotent transcription factors in reprogramming differentiated somatic cells to pluripotent stem cells. Tet1 can replace any one of the four traditional transcription factors including Oct4, Sox2, Klf4 and c-Myc during somatic cell reprogramming. Subsequently, the chimeric mice with germline transmission capacity could be efficiently produced from all induced pluripotent stem (iPS) cell lines reprogrammed by OT (Oct4, Tet1), TSKM (Tet1, Sox2, Klf4, c-Myc), OTK, OTKM and OSTM combinations. Furthermore, the TSKM-reprogrammed iPS cells without using Oct4 could produce viable full-term iPS mice with normal fertility through tetraploid complementation and secondary iPS cells could be induced subsequently from the somatic cells retrieved from the iPS mice. Moreover, we demonstrated that conversion of 5mC into 5hmC in Nanog promoter occurred during reprogramming, which might account in part for the mechanism of Tet1 mediated reprogramming. To our knowledge, our study provides the first evidence demonstrating that DNA modifying enzyme Tet1 can replace the pluripotent transcription factors to reprogram differentiated somatic cells to iPS cells. Gene expression profile of iPS cells and ES cells were generated by Affymetrix Mouse Gene 1.0 ST Array. The Gene expression profile of ES cell R1 was used as control. Three biological repeats were included for each line.

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Dys and Eureprogramming

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