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Assessment and Characterization of Hyaloid Vessels in Mice
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Apoptotic and proliferative defects characterize ocular development in a microphthalmic BMP model.

Curtis R French1, Tara R Stach, Lindsey D March

  • 1Department of Ophthalmology, University of Alberta, Edmonton, Alberta, Canada.

Investigative Ophthalmology & Visual Science
|June 6, 2013
PubMed
Summary

Growth Differentiation Factor 6 (GDF6) is crucial for eye development. Its absence in zebrafish leads to smaller eyes due to early progenitor cell loss and later altered proliferation, involving Foxi genes in the ciliary marginal zone.

Keywords:
Gdf6apoptosisbone morphogenetic proteinforkhead boxproliferation

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Area of Science:

  • Developmental Biology
  • Genetics
  • Ophthalmology

Background:

  • Ocular size is vital for vision and influenced by genetic and environmental factors.
  • Mutations in Growth Differentiation Factor 6 (GDF6) are linked to small eye phenotypes like microphthalmia and anophthalmia.
  • The precise mechanisms underlying GDF6-related eye development disorders remain incompletely understood.

Purpose of the Study:

  • To investigate the roles of apoptosis and cell cycle regulation in zebrafish gdf6a mutant-induced microphthalmia.
  • To identify novel gdf6a-dependent cell cycle regulators using microarray analysis.
  • To elucidate the etiology of small eye phenotypes associated with GDF6 deficiency.

Main Methods:

  • Microarray analysis at 2 days post fertilization to identify GDF6 targets.
  • In situ hybridization to confirm altered gene expression.
  • Immunohistochemistry (phosphohistone H3, activated Caspase 3) to assess proliferation and apoptosis.
  • Inhibition of apoptosis and specific transcription factors (foxi2) to evaluate their impact on eye size.

Main Results:

  • gdf6a(-/-) embryos exhibit reduced retinal progenitor cell numbers by 24 hours post fertilization, leading to microphthalmia.
  • A wave of apoptosis at 28 hours post fertilization contributes minimally to the reduced eye size.
  • Mutants show altered cell proliferation and dysregulation of cell cycle factors, including forkhead box i (foxi) genes in the ciliary marginal zone.
  • Inhibition of foxi2 exacerbates the microphthalmia in gdf6a(-/-) embryos.

Conclusions:

  • gdf6a deficiency causes microphthalmia primarily through early regulation of retinal progenitor cell number and subsequently through altered proliferation in the ciliary marginal zone.
  • Foxi transcription factors act as downstream effectors of GDF6, playing a critical role in eye size determination.
  • These findings provide a mechanistic model for GDF6-related microphthalmia.