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Cooperative Mesp activity is required for normal somitogenesis along the anterior-posterior axis

Mitsuru Morimoto1, Makoto Kiso, Nobuo Sasaki

  • 1Division of Mammalian Development, National Institute of Genetics, Yata 1111, Mishima 411-8540, Japan.

Developmental Biology
|September 26, 2006
PubMed

Insights

Mesp2 protein degradation is crucial for somitogenesis. A minimal Mesp2 protein (P2-HD) rescues some defects, showing axis-specific effects and highlighting Mesp gene dosage sensitivity.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Mesp2 is a bHLH transcription factor essential for somitogenesis.
  • Mesp2 is rapidly degraded post-translationally.
  • Understanding Mesp2's regulation is key to embryonic development.

Purpose of the Study:

  • To investigate the role of Mesp2 degradation in somitogenesis.
  • To characterize the functional domains of Mesp2.
  • To assess the in vivo activity of a minimal Mesp2 construct.

Main Methods:

  • Identification of a Mesp2 degradation domain.
  • Determination of nuclear localization signals (NLS).
  • Construction and in vivo testing of a minimal Mesp2 protein (P2-HD).
  • Quantitative analysis of gene expression in wild-type embryos.

Main Results:

  • Mesp2 contains a proteasome-mediated degradation domain essential in vivo.
  • A minimal P2-HD protein rescues posterior body defects in Mesp2-null mice, showing anterior-posterior axis specificity.
  • Mesp2 activity upregulates Mesp2 and downregulates Mesp1 in later development.
  • Early somitogenesis is sensitive to Mesp gene dosage, requiring a threshold Mesp activity level.

Conclusions:

  • Mesp2 proteolysis is a critical regulatory mechanism in somitogenesis.
  • The P2-HD construct demonstrates functional domains and axis-specific activity.
  • Precise Mesp gene dosage is vital for normal embryonic development and somitogenesis progression.

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