Snai1 represses Nanog to promote embryonic stem cell differentiation

Embryonic stem cell (ESC) self-renewal and pluripotency is maintained by an external signaling pathways and intrinsic regulatory networks involving ESC-specific transcriptional complexes (mainly formed by OCT3/4, Sox2 and Nanog proteins), the Polycomb repressive complex 2 (PRC2) and DNA methylation [1-8]. Among these, Nanog represents the more ESC specific factor and its repression correlates with the loss of pluripotency and ESC differentiation [9-11]. During ESC early differentiation, many development-associated genes become upregulated and although, in general, much is known about the pluripotency self-renewal circuitry, the molecular events that lead ESCs to exit from pluripotency and begin differentiation are largely unknown. Snai1 is one the most early induced genes during ESC differentiation in vitro and in vivo [12,13]. Here we show that Snai1 is able to directly repress several stemness-associated genes including Nanog. We use a ESC stable-line expressing a inducible Snai1 protein. We here show microarray analysis of embryonic stem cells (ESC) expressing Snail-ER at various time points of induction with 4-OH. Data were deposited in Gene Expression Omnibus (GEO) datasets under reference GSE57854 and here: http://epigenetics.hugef-research.org/data.php.