Lineage commitment of embryonic cells involves MEK1-dependent clearance of pluripotency regulator Ventx2.

Abstract:

:During early embryogenesis, cells must exit pluripotency and commit to multiple lineages in all germ-layers. How this transition is operated in vivo is poorly understood. Here, we report that MEK1 and the Nanog-related transcription factor Ventx2 coordinate this transition. MEK1 was required to make Xenopus pluripotent cells competent to respond to all cell fate inducers tested. Importantly, MEK1 activity was necessary to clear the pluripotency protein Ventx2 at the onset of gastrulation. Thus, concomitant MEK1 and Ventx2 knockdown restored the competence of embryonic cells to differentiate. Strikingly, MEK1 appeared to control the asymmetric inheritance of Ventx2 protein following cell division. Consistently, when Ventx2 lacked a functional PEST-destruction motif, it was stabilized, displayed symmetric distribution during cell division and could efficiently maintain pluripotency gene expression over time. We suggest that asymmetric clearance of pluripotency regulators may represent an important mechanism to ensure the progressive assembly of primitive embryonic tissues.

journal_name

Elife

journal_title

eLife

authors

Scerbo P,Marchal L,Kodjabachian L

doi

10.7554/eLife.21526

subject

Has Abstract

pub_date

2017-06-27 00:00:00

issn

2050-084X

journal_volume

6

pub_type

杂志文章

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