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C/EBPα poises B cells for rapid reprogramming into iPS cells [ChIP-Seq]

ABSTRACT: C/EBPα induces transdifferentiation of B cells into macrophages at high efficiencies and enhances reprogramming into induced pluripotent stem cells (iPSCs) when co-expressed with Oct4, Sox2, Klf4 and Myc (OSKM). However, how C/EBPα accomplishes these effects is unclear. We now found that transient C/EBPα expression followed by OSKM activation induces a 100 fold increase in iPSC reprogramming efficiency, involving 95% of the cells. During this conversion pluripotency and epithelial-mesenchymal transition genes become dramatically up-regulated and 60% of the cells express Oct4 within 2 days. C/EBPα acts as a pathbreaker since it transiently makes the chromatin of pluripotency genes more accessible to DNase I. It also induces the expression of the dioxygenase Tet2 and promotes its translocation to the nucleus where it binds to regulatory regions of pluripotency genes that become demethylated following OSKM induction. In line with these findings, overexpression of Tet2 enhances OSKM‐induced B cell reprogramming. Since the enzyme is also required for efficient C/EBPα-induced immune cell conversion, our data suggest that Tet2 provides a mechanistic link between iPSC reprogramming and B cell transdifferentiation. The rapid iPS reprogramming approach described should help to fully elucidate the process and has potential clinical applications.

ORGANISM(S): Mus musculus

PROVIDER: GSE52373 | GEO | 2013/11/17

SECONDARY ACCESSION(S): PRJNA227547

REPOSITORIES: GEO

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C/EBPα poises B cells for rapid reprogramming into iPS cells [ChIP-Seq]

Project description:C/EBPα induces transdifferentiation of B cells into macrophages at high efficiencies and enhances reprogramming into induced pluripotent stem cells (iPSCs) when co-expressed with Oct4, Sox2, Klf4 and Myc (OSKM). However, how C/EBPα accomplishes these effects is unclear. We now found that transient C/EBPα expression followed by OSKM activation induces a 100 fold increase in iPSC reprogramming efficiency, involving 95% of the cells. During this conversion pluripotency and epithelial-mesenchymal transition genes become dramatically up-regulated and 60% of the cells express Oct4 within 2 days. C/EBPα acts as a pathbreaker since it transiently makes the chromatin of pluripotency genes more accessible to DNase I. It also induces the expression of the dioxygenase Tet2 and promotes its translocation to the nucleus where it binds to regulatory regions of pluripotency genes that become demethylated following OSKM induction. In line with these findings, overexpression of Tet2 enhances OSKM‐induced B cell reprogramming. Since the enzyme is also required for efficient C/EBPα-induced immune cell conversion, our data suggest that Tet2 provides a mechanistic link between iPSC reprogramming and B cell transdifferentiation. The rapid iPS reprogramming approach described should help to fully elucidate the process and has potential clinical applications. Change in Cebpa genome binding/occupancy, comparing primary B-cells treated with estradiol for 18h to induce C/EBPa to untreated cells.

2013-11-17 | E-GEOD-52373 | biostudies-arrayexpress

C/EBPα poises B cells for rapid reprogramming into iPS cells

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C/EBP? poises B cells for rapid reprogramming into iPS cells [RNA-Seq]

Project description:C/EBP? induces transdifferentiation of B cells into macrophages at high efficiencies and enhances reprogramming into induced pluripotent stem cells (iPSCs) when co-expressed with Oct4, Sox2, Klf4 and Myc (OSKM). However, how C/EBP? accomplishes these effects is unclear. We now found that transient C/EBP? expression followed by OSKM activation induces a 100 fold increase in iPSC reprogramming efficiency, involving 95% of the cells. During this conversion pluripotency and epithelial-mesenchymal transition genes become dramatically up-regulated and 60% of the cells express Oct4 within 2 days. C/EBP? acts as a pathbreaker since it transiently makes the chromatin of pluripotency genes more accessible to DNase I. It also induces the expression of the dioxygenase Tet2 and promotes its translocation to the nucleus where it binds to regulatory regions of pluripotency genes that become demethylated following OSKM induction. In line with these findings, overexpression of Tet2 enhances OSKM?induced B cell reprogramming. Since the enzyme is also required for efficient C/EBP?-induced immune cell conversion, our data suggest that Tet2 provides a mechanistic link between iPSC reprogramming and B cell transdifferentiation. The rapid iPS reprogramming approach described should help to fully elucidate the process and has potential clinical applications. Change in gene expression, comparing primary B-cells treated with estradiol for 18h to induce C/EBPa to untreated cells.

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C/EBPM-NM-1 poises B cells for rapid reprogramming into iPS cells

Project description:C/EBPM-NM-1 induces transdifferentiation of B cells into macrophages at high efficiencies and enhances reprogramming into induced pluripotent stem cells (iPSCs) when co-expressed with Oct4, Sox2, Klf4 and Myc (OSKM). However, how C/EBPM-NM-1 accomplishes these effects is unclear. We now found that transient C/EBPM-NM-1 expression followed by OSKM activation induces a 100 fold increase in iPSC reprogramming efficiency, involving 95% of the cells. During this conversion pluripotency and epithelial-mesenchymal transition genes become dramatically up-regulated and 60% of the cells express Oct4 within 2 days. C/EBPM-NM-1 acts as a pathbreaker since it transiently makes the chromatin of pluripotency genes more accessible to DNase I. It also induces the expression of the dioxygenase Tet2 and promotes its translocation to the nucleus where it binds to regulatory regions of pluripotency genes that become demethylated following OSKM induction. In line with these findings, overexpression of Tet2 enhances OSKMM-bM-^@M-^Pinduced B cell reprogramming. Since the enzyme is also required for efficient C/EBPM-NM-1-induced immune cell conversion, our data suggest that Tet2 provides a mechanistic link between iPSC reprogramming and B cell transdifferentiation. The rapid iPS reprogramming approach described should help to fully elucidate the process and has potential clinical applications. Refer to individual Series

2013-11-17 | E-GEOD-52397 | biostudies-arrayexpress

C/EBPα poises B cells for rapid reprogramming into iPS cells [array]

Project description:Somatic cell reprogramming into pluripotent stem cells induced by Oct4, Sox2, Klf4 and Myc (OSKM) occurs at low frequencies and with a considerable delay involving a stochastic phase. In contrast, transdifferentiation of B cells into macrophages induced by C/EBPα is fully efficient and initiated almost immediately. We now discovered that a pulse of C/EBPα in B cell precursors followed by OSKM expression dramatically enhances reprogramming to pluripotency, overcoming the stochastic phase. The cells simultaneously activate mesenchymal-epithelial transition and pluripotency genes to high levels within 2 days, correlating with promoter demethylation and accessibility to Oct4 binding. The conditioning effect of C/EBPα is shared with C/EBPβ but not with transcription factors that induce erythroid, neuronal and muscle fates, which are innocuous or inhibitory. Surprisingly, OSKM induce the transient upregulation of macrophage genes in B cells, including Cebpa and Cebpb, as well as trophectoderm genes. Since both C/EBPs are functionally expressed in trophoblasts their unique pluripotency-conditioning capacity might reflect an early embryonic function. Our findings have removed a major hurdle in elucidating mechanisms that establish pluripotency.

2013-11-17 | GSE46321 | GEO

Oct4 binding and Histone modification profiling during OSKM-mediated 2nd reprogramming

Project description:Forced expression of four transcription factors Oct4,Sox2, Klf4 and Myc (OSKM) induces somatic cell reprogramming towards pluripotency. Major efforts have been made to characterize the molecular events involved in this process. Yet, it remains elusive how gene expression change, epigenetic landscape remodelling and cell fate conversion are triggered by expression of these Yamanaka factors.To address this gap,we utilized a secondary inducible reprogramming system and performed genome-wide profilings of Oct4 binding, histone modification(H3K4me3/H3K27me3/H3K4me1/H3K27ac), and gene expression analysis during this process. Through integrative analysis, we revealed stage-specific Oct4 binding and enhancer signatures in consistence with gene expression changes,in which the initial regression of somatic program is followed by the gradual acquisition of pluripotent program. Oct4 preferatially binds to H3K4me1 marked enhancer regions and Oct4 binding is positively correlated with active mark H3K27ac. Moreover,we observed significant enhancer activation of epigenetic related genes, especially acetylation associated genes, prior to pluripotency network activation, suggesting a pivotal role of epigenetic remodelling in the process of pluripotency acquisition and maintenance. We used ChIP-seq to explore the global changes of Oct4 binding profiling during OSKM-mediated somatic cell reprogramming. The exogenous Oct4 was tagged with 3XFlag, thus we used anti-flag antibody to monitor exogenous Oct4 changes; anti-Oct4 antibody which recognizes both endogenous and exogenous Oct4 was used to monitor total Oct4 changes during iPSC induction. In addition, we also examined genome-wide H3K4me1/H3K27ac/H3K4me3/H3K27me3/RNAPII profiling during 3Flag-OSKM 2' reprogramming.

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2015-04-30 | E-GEOD-67265 | biostudies-arrayexpress

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