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LIN28 phosphorylation by MAPK/ERK couples signalling to the post-transcriptional control of pluripotency
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LIN28 phosphorylation by MAPK/ERK couples signalling to the post-transcriptional control of pluripotency
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Journal Article
LIN28 phosphorylation by MAPK/ERK couples signalling to the post-transcriptional control of pluripotency
2017
Overview
Daley and colleagues report that MAPK signalling controls pluripotency in embryonic stem cells and during somatic cell reprogramming by enhancing the stability and effects of LIN28 on direct mRNA targets through its phosphorylation by ERK.
Signalling and post-transcriptional gene control are both critical for the regulation of pluripotency
1
,
2
, yet how they are integrated to influence cell identity remains poorly understood. LIN28 (also known as LIN28A), a highly conserved RNA-binding protein, has emerged as a central post-transcriptional regulator of cell fate through blockade of
let-7
microRNA biogenesis and direct modulation of mRNA translation
3
. Here we show that LIN28 is phosphorylated by MAPK/ERK in pluripotent stem cells, which increases its levels via post-translational stabilization. LIN28 phosphorylation had little impact on
let-7
but enhanced the effect of LIN28 on its direct mRNA targets, revealing a mechanism that uncouples LIN28’s
let-7
-dependent and -independent activities. We have linked this mechanism to the induction of pluripotency by somatic cell reprogramming and the transition from naive to primed pluripotency. Collectively, our findings indicate that MAPK/ERK directly impacts LIN28, defining an axis that connects signalling, post-transcriptional gene control, and cell fate regulation.
Publisher
Nature Publishing Group UK,Nature Publishing Group
