Signaling Dynamics Control Cell Fate in the Early Drosophila Embryo

Overview

Journal Dev Cell

Publisher Cell Press

Specialties Cell Biology
Reproductive Medicine

Date 2019 Feb 13

PMID 30753836

Citations 71

Authors

Heath E Johnson

Jared E Toettcher

Affiliations

Soon will be listed here.

Abstract

The Erk mitogen-activated protein kinase plays diverse roles in animal development. Its widespread reuse raises a conundrum: when a single kinase like Erk is activated, how does a developing cell know which fate to adopt? We combine optogenetic control with genetic perturbations to dissect Erk-dependent fates in the early Drosophila embryo. We find that Erk activity is sufficient to "posteriorize" 88% of the embryo, inducing gut endoderm-like gene expression and morphogenetic movements in all cells within this region. Gut endoderm fate adoption requires at least 1 h of signaling, whereas a 30-min Erk pulse specifies a distinct ectodermal cell type, intermediate neuroblasts. We find that the endoderm-ectoderm cell fate switch is controlled by the cumulative load of Erk activity, not the duration of a single pulse. The fly embryo thus harbors a classic example of dynamic control, where the temporal profile of Erk signaling selects between distinct physiological outcomes.

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