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Related Experiment Videos

Nab proteins mediate a negative feedback loop controlling Krox-20 activity in the developing hindbrain.

F Mechta-Grigoriou1, S Garel, P Charnay

  • 1Unité 368 de l'Institut National de la Santé et de la Recherche Médicale, Ecole Normale Supérieure, Paris France.

Development (Cambridge, England)
|February 2, 2000
PubMed
Summary

Krox-20 regulates its own inhibitors, Nab1 and Nab2, in the developing hindbrain. This negative feedback loop is crucial for controlling hindbrain segmentation and development.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Genetics

Background:

  • The vertebrate hindbrain develops into segmented units called rhombomeres.
  • Krox-20 is a key transcription factor for specific rhombomere development.
  • Nab1 and Nab2 are known Krox-20 antagonists in cell culture.

Purpose of the Study:

  • To investigate the regulatory relationship between Krox-20 and its antagonists Nab1/Nab2 in vivo.
  • To determine if a negative feedback loop controls Krox-20 activity during hindbrain development.

Main Methods:

  • Studied Krox-20, Nab1, and Nab2 expression patterns in mouse hindbrain.
  • Examined hindbrain marker expression in zebrafish embryos with misexpressed Nab1 or Nab2.

Main Results:

Related Experiment Videos

  • Nab1 and Nab2 expression in the mouse hindbrain mirrors Krox-20 patterns and depends on Krox-20.
  • Misexpression of Nab1 or Nab2 in zebrafish alters hindbrain marker expression, indicating Krox-20 inhibition.

Conclusions:

  • Krox-20 positively regulates the expression of its antagonists, Nab1 and Nab2.
  • A negative feedback loop involving Krox-20, Nab1, and Nab2 likely controls hindbrain development.