Summary
This research demonstrates that heterozygous deletion of the CASK gene in mice reproduces key features of Optic Nerve Hypoplasia seen in human patients, including reduced optic nerve size, fewer retinal ganglion cells, and vision deficits. Critically, selective removal of CASK from retinal ganglion cells alone was insufficient to cause additional ONH pathology, pointing to a non-cell-autonomous mechanism that has implications for future therapeutic targeting strategies.
Key Findings
- Heterozygous CASK deletion (Cask+/-) in mice recapitulated human ONH phenotypes: reduced optic nerve size, reduced retinal ganglion cell (RGC) numbers, reduced RGC axonal diameter, and vision-related task deficits.
- Homozygous partial loss-of-function variant (Caskfl/fl) also displayed ONH with reduced RGC numbers.
- Conditional deletion of CASK specifically from RGCs (using Cre recombinase in RGCs) did not further alter optic nerve size or RGC survival, indicating a non-cell-autonomous mechanism underlies CASK-associated ONH.
Categories
Eye Health & Vision: This study investigates the cellular and molecular mechanisms of Optic Nerve Hypoplasia (ONH), the leading cause of childhood blindness, using mouse models with CASK gene mutations.
Author(s)
AM Kerr
Publication Year
2019
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