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Building the spine: the vertebrate segmentation clock.

O Pourquié1

  • 1Howard Hughes Medical Institute, USA.

Cold Spring Harbor Symposia on Quantitative Biology
|April 19, 2008
PubMed
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Animal and plant species exhibit periodic anatomical modules. Vertebrate segmentation relies on a molecular segmentation clock, but its precise molecular mechanisms remain poorly understood.

Area of Science:

  • Developmental biology
  • Comparative anatomy
  • Molecular genetics

Background:

  • Many animal and plant species display periodically repeated anatomical modules.
  • Segmentation, a body axis patterning strategy in animals, is observed in both vertebrates and invertebrates.
  • Vertebrate segmentation is linked to a molecular oscillator known as the segmentation clock.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the segmentation clock.
  • To understand the role of signaling pathways in generating periodic gene expression for segmentation.

Main Methods:

  • Analysis of microarray data in mouse models.
  • Investigation of gene networks involving Notch, Wnt, and FGF pathways.
  • Exploration of negative autoregulatory circuits involving hairy and enhancer of split genes.

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Main Results:

  • Identification of a large network of oscillating signaling genes within the Notch, Wnt, and FGF pathways.
  • Previous models suggested simple autoregulatory circuits as the clock pacemaker.
  • The precise molecular clockwork remains incompletely understood despite progress.

Conclusions:

  • The segmentation clock is a crucial component of vertebrate segmentation.
  • Oscillating gene networks, particularly involving Notch, Wnt, and FGF, are implicated in the segmentation clock.
  • Further research is needed to fully elucidate the molecular basis of this developmental oscillator.