Homo sapiens
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA131167 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Human induced pluripotent stem (iPS) cells are remarkably similar to embryonic stem (ES) cells, but recent reports indicate that there may be important differences between them. We carried out a systematic comparison of human iPS cells generated from hepatocytes (representative of endoderm), skin fibroblasts (mesoderm) and melanocytes (ectoderm). All low-passage iPS cells analysed retain a transcriptional memory of the original cells. The persistent expression of somatic genes can be partially explained by incomplete promoter DNA methylation. This epigenetic mechanism underlies a robust form of memory that can be found in iPS cells generated by multiple laboratories using different methods, including RNA transfection. Incompletely silenced genes tend to be isolated from other genes that are repressed during reprogramming, indicating that recruitment of the silencing machinery may be inefficient at isolated genes. Knockdown of the incompletely reprogrammed gene C9orf64 (chromosome 9 open reading frame 64) reduces the efficiency of human iPS cell generation, indicating that somatic memory genes may be functionally relevant during reprogramming. iPS cells were produced from melanocytes, fibroblasts, and hepatocytes, representing the three germ layers. Expression levels were profiled in the differentiated cells and their matched iPS cells, as well as 3 human ES cell lines (H1, H7 and H9) and their embroid bodies.
2011-04-17 | E-GEOD-23034 | biostudies-arrayexpress
Project description:Human induced pluripotent stem (iPS) cells are remarkably similar to embryonic stem (ES) cells, but recent reports indicate that there may be important differences between them. We carried out a systematic comparison of human iPS cells generated from hepatocytes (representative of endoderm), skin fibroblasts (mesoderm) and melanocytes (ectoderm). All low-passage iPS cells analysed retain a transcriptional memory of the original cells. The persistent expression of somatic genes can be partially explained by incomplete promoter DNA methylation. This epigenetic mechanism underlies a robust form of memory that can be found in iPS cells generated by multiple laboratories using different methods, including RNA transfection. Incompletely silenced genes tend to be isolated from other genes that are repressed during reprogramming, indicating that recruitment of the silencing machinery may be inefficient at isolated genes. Knockdown of the incompletely reprogrammed gene C9orf64 (chromosome 9 open reading frame 64) reduces the efficiency of human iPS cell generation, indicating that somatic memory genes may be functionally relevant during reprogramming.
2011-04-17 | GSE23034 | GEO
Project description:Genome-wide DNA methylation was studied to determine whether iPS cells retain epigenetic memory at loci associated with its tissue of origin. We used custom Nimblegen microarrays to determine the genome-wide DNA methylation in human iPS cells, ES cells, and somatic cells We isolated genomic DNA from human stem cells and somatic cells and hybridized to custom-designed Nimblegen microarrays (CHARM arrays).
2011-11-29 | E-GEOD-27134 | biostudies-arrayexpress
Project description:Genome-wide DNA methylation was studied to determine whether iPS cells retain epigenetic memory at loci associated with its tissue of origin. We used custom Nimblegen microarrays to determine the genome-wide DNA methylation in human iPS cells, ES cells, and somatic cells
2011-11-29 | GSE27134 | GEO
Project description:Transcription factor-mediated reprogramming yields induced pluripotent stem cells (iPSC) by erasing tissue specific methylation and re-setting DNA methylation status to an embryonic stage. We compared bona fide human iPSC derived from umbilical cord blood (CB) and neonatal keratinocytes (K). Through both incomplete erasure of tissue specific methylation and de novo tissue specific methylation, CB-iPSC and K-iPSC are distinct in genome-wide DNA methylation profiles. Functionally, CB-iPSC displayed better blood formation in vitro, whereas K-iPSC differentiated better to a keratinocyte fate, implying that the tissue of origin needs to be considered in future therapeutic applications of human iPSCs. We performed gene expression and global DNA methylation profiling on iPS and the source somatic cell types to search for evidence of epigenetic memory. We performed gene expression profiling to identify genes differentially expressed between keratinocytes and cord blood, and from induced pluripotent stem cells from these somatic tissues.
2011-11-29 | E-GEOD-27186 | biostudies-arrayexpress
Project description:Transcription factor-mediated reprogramming yields induced pluripotent stem cells (iPSC) by erasing tissue specific methylation and re-setting DNA methylation status to an embryonic stage. We compared bona fide human iPSC derived from umbilical cord blood (CB) and neonatal keratinocytes (K). Through both incomplete erasure of tissue specific methylation and de novo tissue specific methylation, CB-iPSC and K-iPSC are distinct in genome-wide DNA methylation profiles. Functionally, CB-iPSC displayed better blood formation in vitro, whereas K-iPSC differentiated better to a keratinocyte fate, implying that the tissue of origin needs to be considered in future therapeutic applications of human iPSCs. We performed gene expression and global DNA methylation profiling on iPS and the source somatic cell types to search for evidence of epigenetic memory.
2011-11-29 | GSE27186 | GEO
Project description:Genome wide DNA methylation profiling of somatic and pluripotent cells from different lineages (mesoderm, endoderm and parthenogenetic germ cells) The Illumina Infinium 27k Human DNA methylation Beadchip v1.2 was used to obtain DNA methylation profiles across approximately 27,000 CpGs. Samples included 1 Human ES cell line, 2 beta cells, 2 beta-iPS cells, 1 fibroblast, 2 fibroblast-iPS cells, 2 parthenogenetic cells and 3 parthenogenetic-iPS cells. Molecular reprogramming of somatic cells into human induced pluripotent stem cells (iPSCs) is accompanied by extensive changes in gene expression patterns and epigenetic marks. To better understand the link between gene expression and DNA methylation, we have profiled human somatic cells from different embryonic cell types (endoderm, mesoderm and parthenogenetic germ cells) and the iPSCs generated from them. We show that reprogramming is accompanied by extensive DNA methylation in CpG-poor promoters, sparing CpG-rich promoters. Intriguingly, methylation in CpG-poor promoters occurred not only in downregulated genes, but also in genes that are not expressed in the parental somatic cells or their respective iPSCs. These genes are predominantly tissue-specific genes of other cell types from different lineages. Our results suggest a role of DNA methylation in the silencing of the somatic cell identity by global non-specific methylation of tissue-specific genes from all lineages, regardless of their expression in the parental somatic cells.
2014-05-01 | GSE52238 | GEO
Project description:Genome wide DNA methylation profiling of somatic and pluripotent cells from different lineages (mesoderm, endoderm and parthenogenetic germ cells) The Illumina Infinium 27k Human DNA methylation Beadchip v1.2 was used to obtain DNA methylation profiles across approximately 27,000 CpGs. Samples included 1 Human ES cell line, 2 beta cells, 2 beta-iPS cells, 1 fibroblast, 2 fibroblast-iPS cells, 2 parthenogenetic cells and 3 parthenogenetic-iPS cells. Molecular reprogramming of somatic cells into human induced pluripotent stem cells (iPSCs) is accompanied by extensive changes in gene expression patterns and epigenetic marks. To better understand the link between gene expression and DNA methylation, we have profiled human somatic cells from different embryonic cell types (endoderm, mesoderm and parthenogenetic germ cells) and the iPSCs generated from them. We show that reprogramming is accompanied by extensive DNA methylation in CpG-poor promoters, sparing CpG-rich promoters. Intriguingly, methylation in CpG-poor promoters occurred not only in downregulated genes, but also in genes that are not expressed in the parental somatic cells or their respective iPSCs. These genes are predominantly tissue-specific genes of other cell types from different lineages. Our results suggest a role of DNA methylation in the silencing of the somatic cell identity by global non-specific methylation of tissue-specific genes from all lineages, regardless of their expression in the parental somatic cells. Genomic DNA from each sample was bisulfite converted, DNA was applied to BeadChips (Illumina). 13 samples included, Human ES cell as control.
2014-05-01 | E-GEOD-52238 | biostudies-arrayexpress
Project description:This SuperSeries is composed of the following subset Series: GSE27134: DNA methylation data from human iPS cells, ES cells, cord blood, and keratinocytes GSE27186: Expression data of human somatic cell types and induced pluripotent stem cells GSE31742: DNA methylation data from human keratinocyte-derived iPS cells (N9) and ES cells Refer to individual Series
2011-11-29 | E-GEOD-27224 | biostudies-arrayexpress
Project description:Genome-wide DNA methylation of early and late passaged keratinocyte-derived iPS cells were compared to ES cells. We used custom Nimblegen microarrays to determine the genome-wide DNA methylation in human keratinocyte-derived iPS cells and ES cells We isolated genomic DNA from human stem cells and somatic cells and hybridized to custom-designed Nimblegen microarrays (CHARM arrays).
2011-11-29 | E-GEOD-31742 | biostudies-arrayexpress