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Vertebrate segmentation: snail counts the time until morphogenesis.

Scott A Holley1

  • 1Department of Molecular, Cellular and Developmental Biology, Yale University, P.O. Box 208103, New Haven, Connecticut 06520, USA. scott.holley@yale.edu

Current Biology : CB
|May 23, 2006
PubMed
Summary
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The somite clock regulates vertebrate embryo segmentation. A new study reveals the transcription factor Snail connects this clock to somite formation and shape.

Area of Science:

  • Developmental biology
  • Molecular biology
  • Embryology

Background:

  • Vertebrate embryonic development involves precise segmentation of mesoderm into somites.
  • The segmentation process is controlled by a molecular oscillator known as the somite clock.
  • Somite morphogenesis, the development of somite structure, requires precise regulation.

Purpose of the Study:

  • To identify molecular links between the somite clock and the mechanisms controlling somite morphogenesis.
  • To investigate the role of transcription factor Snail in somite development.

Main Methods:

  • Analysis of gene expression patterns during somitogenesis.
  • Investigating the function of the Snail transcription factor in vivo and in vitro.
  • Utilizing genetic manipulation techniques in vertebrate embryos.

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Main Results:

  • The transcription factor Snail is identified as a key regulator in somitogenesis.
  • Snail acts as a crucial link connecting the oscillating somite clock to the physical formation of somites.
  • Snail influences cell behaviors necessary for epithelialization and boundary formation during segmentation.

Conclusions:

  • The transcription factor Snail is a critical mediator between the somite clock and somite morphogenesis.
  • Understanding Snail's role provides new insights into the molecular control of embryonic segmentation.
  • This finding advances our knowledge of how oscillating gene expression translates into tissue patterning.