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Ripply suppresses Tbx6 to induce dynamic-to-static conversion in somite segmentation.

Taijiro Yabe1,2,3, Koichiro Uriu4, Shinji Takada5,6,7

  • 1Exploratory Research Center on Life and Living Systems (ExCELLS), National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji-cho, Okazaki, Aichi, 444-8787, Japan. yabe@nibb.ac.jp.

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The Ripply/Tbx6 molecular machinery converts dynamic clock gene oscillations into static somite patterns in zebrafish embryos. This process is crucial for somitogenesis, ensuring proper embryonic development.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Embryonic development relies on the precise formation of somites, segmented blocks of tissue.
  • Somitogenesis involves dynamic oscillatory gene expression in the presomitic mesoderm.
  • The mechanism converting dynamic oscillations to static somite patterns remains largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanism responsible for converting dynamic gene oscillations into static somite patterns.
  • To investigate the role of the Ripply/Tbx6 machinery in somitogenesis.

Main Methods:

  • Utilized zebrafish embryos as a model organism.
  • Investigated gene and protein expression patterns of clock genes, Ripply, and Tbx6.
  • Employed mathematical modeling and simulations to analyze the molecular network dynamics.

Main Results:

  • Ripply1/Ripply2 proteins mediate Tbx6 protein removal, defining somite boundaries and halting clock gene expression.
  • Ripply expression is regulated by clock oscillations and an Erk signaling gradient.
  • Ripply-induced Tbx6 suppression is sustained, enabling complete somite boundary formation.

Conclusions:

  • The Ripply/Tbx6 machinery is a key regulator in the dynamic-to-static conversion during somitogenesis.
  • Sustained Tbx6 suppression by Ripply is essential for successful somite pattern formation.
  • Mathematical modeling confirms the proposed molecular network's ability to reproduce this conversion.