Unknown,Transcriptomics,Genomics,Proteomics

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Activin regulates H3K4me3 in hPSC

ABSTRACT: Activin signalling controls the pluripotency of human embryonic stem cells (hESCs) by inducing the formation of nuclear Smad2/3-Nanog complexes that bind to and regulate several downstream targets. We aimed to clarify the transcriptional dynamics to the inhibition of Activin in hPSCs. To this end we performed microarray analysis of hPSCs treated with SB431542 (SB), an antagonist of the ALK4 and ALK7 type I Activin receptors, for early (2h, 4h and 8h) and late (24h and 48h) time points. Moreover, given our finding that Activin signalling regulates H3K4me3 of its target genes, we tested the transcriptional effect to the knock-down of the Mll/Set1 complex subunit Dpy30 by using shRNA. Finally, we also evaluated the transcriptional response to the knock-down of the Smad2/3 cofactor Nanog by using shRNA.

ORGANISM(S): Homo sapiens

SUBMITTER: Alessandro Bertero

PROVIDER: E-MTAB-2749 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Nodal and Activin are morphogens of the TGFbeta superfamily of signaling molecules that direct differential cell fate decisions in a dose- and distance-dependent manner. During early embryonic development the Nodal/Activin pathway is responsible for the specification of mesoderm, endoderm, node and mesendoderm. In contradiction to this drive towards cellular differentiation, the pathway also plays important roles in the maintenance of self-renewal and pluripotency in embryonic and epiblast stem cells. The molecular basis behind stem cell interpretation of Nodal/Activin signaling gradients and the undertaking of disparate cell fate decisions remains poorly understood. Here, we show that any perturbation of endogenous signaling levels in mouse ES cells leads to their exit from self renewal towards divergent differentiation programs. Increasing Nodal signals above basal levels by direct stimulation with Activin promotes differentiation towards the mesendodermal lineages while repression of signaling with the specific Nodal/Activin receptor inhibitor SB431542 induces trophectodermal differentiation. To address how quantitative Nodal/Activin signals are translated qualitatively into distinct cell fates decisions, we performed chromatin immunoprecipitation of phospho-Smad2 the primary downstream transcriptional factor of the Nodal/Activin pathway followed by massively parallel sequencing and show that phospho-Smad2 binds to and regulates distinct subsets of target genes in a dose-dependent manner. Crucially, Nodal/Activin signaling directly controls the Oct4 master regulator of pluripotency by graded phospho-Smad2 binding in the promoter region. Hence stem cells interpret and carry out differential Nodal/Activin signaling instructions via a corresponding gradient of Smad2 phosphorylation that selectively titrates self-renewal against alternative differentiation programs by direct regulation of distinct target gene subsets and Oct4 expression. Four biological replicates consisting of 4 different passages of E14TG2a ES cells at P20, P21, P23 and P24

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Activin regulates H3K4me3 in hPSC

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