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Lymphocyte activation is initiated by a global increase in messenger RNA synthesis. However, the mechanisms driving transcriptome amplification during the immune response are unknown. By monitoring single-stranded DNA genome wide, we show that the genome of naive cells is poised for rapid activation. In G0, ∼90% of promoters from genes to be expressed in cycling lymphocytes are polymerase loaded but...
Induction of pluripotency in somatic cells has been achieved by myriad combinations of transcription factors that belong to the core pluripotency circuitry. In this issue, Shu et al. report reprogramming with lineage specifiers, lending support to the view of the pluripotent state as a fine balance between competing differentiation forces.
Enhancers have been intensely studied as the sequences determining spatial and temporal gene expression during development. Lagha et al. now put the focus back on the promoter as the critical element coordinating gene expression across a cell population.
Epigenetic mechanisms have been proposed to play crucial roles in mammalian development, but their precise functions are only partially understood. To investigate epigenetic regulation of embryonic development, we differentiated human embryonic stem cells into mesendoderm, neural progenitor cells, trophoblast-like cells, and mesenchymal stem cells and systematically characterized DNA methylation,...
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