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Related Experiment Videos

RaxL regulates chick ganglion cell development.

Kiyo Sakagami1, Akiko Ishii, Naoko Shimada

  • 1Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0101, Japan.

Mechanisms of Development
|September 10, 2003
PubMed
Summary

RaxL protein inhibits chick retinal ganglion cell development. Loss of RaxL expression is necessary for maintaining these cells in the ganglion cell layer.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Ophthalmology

Background:

  • RaxL is a homeobox gene crucial for vertebrate eye development.
  • Understanding RaxL's role in retinal cell differentiation is vital.

Purpose of the Study:

  • To investigate RaxL protein expression during chick retinal development.
  • To elucidate the function of RaxL in retinal ganglion cell (RGC) development and maintenance.

Main Methods:

  • Double-immunostaining for RaxL and RGC markers (RA4, cBrn-3, Islet-1, beta-tubulin).
  • In vivo gain- and loss-of-function studies using retroviral vectors in chick embryos.
  • Analysis of RGC numbers and apoptosis in the ganglion cell layer (GCL).

Main Results:

Related Experiment Videos

  • RaxL downregulation correlates with RGC marker upregulation in the GCL.
  • Overexpression of RaxL decreased Islet-1 positive RGCs and caused complete RGC loss by E15.
  • Dominant-negative RaxL initially increased GCL cells but led to ectopic apoptosis and reduced cell numbers by E15.

Conclusions:

  • RaxL inhibits RGC development.
  • RaxL downregulation is essential for RGC maintenance in the developing chick retina.