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Updated: Oct 26, 2025

Spatial and Temporal Analysis of Active ERK in the C. elegans Germline
08:40

Spatial and Temporal Analysis of Active ERK in the C. elegans Germline

Published on: November 29, 2016

10.4K

Nuclear translocation of the tagged endogenous MAPK MPK-1 denotes a subset of activation events in C. elegans

Neal R Rasmussen1, David J Reiner1

  • 1Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Texas A&M University, Houston, 77030, USA.

Journal of Cell Science
|August 3, 2021
PubMed

Insights

Researchers tagged the Caenorhabditis elegans ERK gene, mpk-1, to study extracellular signal-regulated kinases (ERKs) activation in vivo. They observed MPK-1 nuclear translocation in oocytes and vulval precursor cells, providing insights into ERK regulation.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Developmental Biology

Background:

  • Extracellular signal-regulated kinases (ERKs), a type of mitogen-activated protein kinase (MAPK), are crucial downstream effectors in Ras-Raf-MEK signaling pathways.
  • Elevated ERK activation is observed in Ras-driven tumors and RASopathies, making it a significant target for pharmacological interventions.
  • While ERK regulation is well-studied in vitro and in cell cultures, in vivo studies in living organisms remain limited.

Purpose of the Study:

  • To investigate the in vivo regulation of ERK activation using a tagged Caenorhabditis elegans homolog, mpk-1.
  • To establish and validate nuclear translocation of MPK-1 as a reporter for ERK activation events in a whole animal system.
  • To examine the role and localization of MPK-1 during the development of vulval precursor cells (VPCs).

Main Methods:

  • Genetically tagged the Caenorhabditis elegans ERK-encoding gene, mpk-1, to enable visualization of protein localization.
  • Observed MPK-1 localization in maturing oocytes to validate cytosol-to-nuclear translocation as an activation reporter.
  • Analyzed MPK-1 translocation patterns within the six vulval precursor cells (VPCs) during vulval development.

Main Results:

  • MPK-1 is ubiquitously expressed in C. elegans, with heightened expression in specific cellular contexts.
  • Cytosol-to-nuclear translocation of MPK-1 was detected in maturing oocytes, confirming its utility as an activation reporter.
  • During VPC patterning, MPK-1 is essential for the P6.p cell's primary fate and exhibits a temporal and concentration gradient of nuclear translocation across all six VPCs, centered on P6.p.

Conclusions:

  • The tagged MPK-1 system in C. elegans provides a valuable tool for studying ERK activation in vivo.
  • Observed MPK-1 nuclear translocation patterns in VPCs differ from previous reporter studies, suggesting complex activation mechanisms.
  • This research offers critical insights into the regulation of MPK-1 activation within intricate intercellular signaling networks in a living organism.
Keywords:
C. elegansCell fate patterningEGFEGFRKTRLET-23LET-60LIN-45MAPKMEK-2Nuclear translocationVulval developmentnKTR

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