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ERK Activity Dynamics during Zebrafish Embryonic Development.

Kah-Loon Wong1, Ryutaro Akiyama2, Yasumasa Bessho3

  • 1Gene Regulation Research, Division of Biological Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, Nara 630-0101, Japan. blckahloon@gmail.com.

International Journal of Molecular Sciences
|January 2, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new system to track extracellular signal-regulated kinase (ERK) activity in developing zebrafish embryos. This breakthrough allows unprecedented visualization of ERK dynamics, crucial for understanding tissue and organ formation during vertebrate development.

Keywords:
biosensormitogen-activated protein kinase (MAPK)signal activityvertebrate development

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Extracellular signal-regulated kinase (ERK) pathway is vital for vertebrate development, regulating organogenesis.
  • Growth factors like fibroblast growth factor (FGF) activate ERK, influencing tissue formation.
  • A lack of experimental systems to monitor whole-embryo ERK activity dynamics has limited research.

Purpose of the Study:

  • To develop and validate a transgenic zebrafish model for real-time monitoring of ERK activity dynamics throughout embryonic development.
  • To generate a spatiotemporal map of ERK activity in the entire zebrafish embryo.
  • To identify novel ERK activation domains and dynamics during embryogenesis.

Main Methods:

  • Generation of transgenic zebrafish ubiquitously expressing a Förster resonance energy transfer (FRET)-based ERK biosensor.
  • Monitoring ERK activity dynamics in living zebrafish embryos from late blastula to late segmentation stages.
  • Comparison of biosensor data with immunostaining using anti-phosphorylated ERK antibody.

Main Results:

  • Successful establishment of a system for whole-embryo ERK activity monitoring in zebrafish.
  • Identification of specific ERK activation domains consistent with known developmental processes.
  • Generation of a comprehensive spatiotemporal map of ERK activity during embryogenesis.
  • Discovery of previously unrecognized ERK activation dynamics and domains.

Conclusions:

  • The developed transgenic system is the first to enable dynamic monitoring of ERK activity across an entire vertebrate embryo.
  • This system provides critical insights into the role of ERK signaling in normal and abnormal vertebrate development.
  • The findings pave the way for further investigation into ERK's function in developmental processes.