FGF/ERK autocrine signaling is enhanced by NANOG in a subpopulation of pluripotent stem cells to execute autoregulation and induce heterogeneity
Kale, H. T.; Rajpurohit, R. S.; Jana, D.; Vijay, V. V.; Srivastava, M.; Mourya, P. R.; Srinivas, G.; Shekar, P. C.
Show abstract
The self-renewal and differentiation potential of Embryonic stem cells (ESCs) is maintained by the regulated expression of core pluripotency factors. The expression level of core pluripotency factor Nanog is tightly regulated by a negative feedback autorepression loop. However, it remains unclear how the ESCs perceive the NANOG levels and execute autorepression. Here, we show that a dose-dependent induction of Fgfbp1 and Fgfr2 by NANOG activates an autocrine mediated ERK signaling in high-Nanog cells to trigger autorepression. pERK recruits NONO to Nanog locus to repress transcription by preventing POL2 loading. The Nanog autorepression process establishes a self-perpetuating NANOG-pERK reciprocal regulatory circuit. We further demonstrate that the reciprocal regulatory circuit induces the pERK heterogeneity and ERK signaling dynamics in pluripotent stem cells.
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