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Spatial and Temporal Analysis of Active ERK in the C. elegans Germline
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Dusp6 (Mkp3) is a negative feedback regulator of FGF-stimulated ERK signaling during mouse development

Chaoying Li1, Daryl A Scott, Ekaterina Hatch

  • 1Department of Human Genetics, University of Utah, 15 N 2030 E RM 2100, Salt Lake City, UT 84112-5330, USA.

Development (Cambridge, England)
|December 14, 2006
PubMed

Insights

Fibroblast growth factor receptor (FGFR) signaling is regulated by DUSP6, an ERK-specific phosphatase. Loss of DUSP6 in mice leads to developmental defects, suggesting DUSP6 mutations may cause FGFR-related syndromes.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Mitogen-activated protein kinase (MAPK) pathways transmit extracellular signals crucial for cellular processes.
  • MAPK signaling is regulated by MAPK phosphatases (MKPs), which dephosphorylate activated MAPKs.
  • Negative feedback loops, where MKPs are induced by the pathways they inhibit, are critical for signal attenuation.

Purpose of the Study:

  • To investigate the role of DUSP6, encoding MKP3, in regulating Fibroblast growth factor receptor (FGFR) signaling in vivo.
  • To determine the consequences of DUSP6 inactivation on ERK signaling and embryonic development.
  • To explore the potential link between DUSP6 mutations and FGFR-like syndromes.

Main Methods:

  • Utilized mouse embryos to study gene transcription and protein activation.
  • Employed targeted gene inactivation of Dusp6.
  • Analyzed levels of phosphorylated ERK (pERK), pERK target Erm, and Dusp6 promoter activity.
  • Observed phenotypes in Dusp6 mutant mice, including lethality and skeletal abnormalities.

Main Results:

  • FGFRs are essential for Dusp6 transcription in mouse embryos.
  • Dusp6 inactivation resulted in elevated pERK levels and increased expression of its target Erm.
  • Dusp6 mutant allele caused dominant postnatal lethality, skeletal dwarfism, craniosynostosis, and hearing loss.
  • These phenotypes resemble those caused by aberrant FGFR activation.

Conclusions:

  • DUSP6 functions as a critical in vivo negative feedback regulator of FGFR signaling.
  • Mutations in DUSP6 or related genes are potential candidates for unexplained FGFR-like syndromes.
  • This study highlights the importance of precise regulation of FGFR signaling during development.

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