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Related Experiment Videos

Diverse initiation in a conserved left-right pathway?

H J Yost1

  • 1Huntsman Cancer Institute, University of Utah, 2000 E. North Campus Drive, Room 452, Salt Lake City, Utah 84112-5550, USA. joseph.yost@hci.utah.edu

Current Opinion in Genetics & Development
|August 17, 1999
PubMed
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Conserved gene expression patterns in nodal and pitx2 precede vertebrate left-right development. These patterns suggest a conserved

Area of Science:

  • Developmental Biology
  • Evolutionary Developmental Biology
  • Genetics

Background:

  • Left-right asymmetry is crucial for vertebrate organogenesis.
  • Conserved gene expression patterns of nodal and pitx2 are observed across vertebrates preceding asymmetric morphogenesis.
  • The underlying mechanisms initiating these conserved patterns remain largely unknown.

Purpose of the Study:

  • To propose that conserved nodal and pitx2 expression patterns indicate 'left-right' phylotypic stages in vertebrate development.
  • To highlight the question of whether these conserved patterns arise from conserved or divergent developmental mechanisms.

Main Methods:

  • Comparative analysis of gene expression patterns (nodal, pitx2) across major vertebrate groups.
  • Review of existing literature on asymmetric morphogenesis and developmental mechanisms.

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Main Results:

  • Identified striking similarities in asymmetric nodal and pitx2 gene expression patterns preceding left-right morphogenesis in diverse vertebrates.
  • These conserved patterns suggest a potential 'left-right' phylotypic stage.

Conclusions:

  • The conserved gene expression patterns of nodal and pitx2 are strong indicators of a conserved phylotypic stage for left-right development in vertebrates.
  • Further research is needed to determine if the initiation of these patterns involves conserved or divergent developmental pathways.