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Exaggerated eye growth in IRBP-deficient mice in early development
Jeffrey Wisard1, Amanda Faulkner, Micah A Chrenek
1Department of Ophthalmology, Emory University, Atlanta, Georgia 30322, USA.
Investigative Ophthalmology & Visual Science
|June 7, 2011
Summary
Interphotoreceptor retinoid-binding protein (IRBP) is crucial for normal eye development, not just the visual cycle. IRBP knockout mice exhibit excessive ocular enlargement and altered retinal structure.
Area of Science:
- Ophthalmology
- Developmental Biology
- Retinal Science
Background:
- Interphotoreceptor retinoid-binding protein (IRBP) is known for its role in the visual cycle.
- IRBP is expressed early in development, prior to its established function.
Purpose of the Study:
- To investigate the role of IRBP in controlling eye growth during development.
- To determine if IRBP influences ocular development beyond its function in the visual cycle.
Main Methods:
- Comparison of eyes from IRBP knockout (KO) and wild-type (WT) mice (C57BL/6J).
- Histology, laser micrometry, cycloplegic photorefractions, and partial coherence interferometry were employed.
- Analysis spanned ages from postnatal day 2 (P2) to P440.
Main Results:
- IRBP KO mouse eyes were significantly larger and heavier than WT eyes, even before eye-opening.
- Excessive ocular enlargement began between P7 and P10 in KO mice.
- KO retinas showed reduced outer nuclear layer thickness and fewer cones, with increased apoptosis, despite similar retinal cell birth rates compared to WT.
Conclusions:
- IRBP is essential for normal eye development, playing a role beyond the visual cycle.
- IRBP deficiency leads to significant ocular enlargement and retinal structural abnormalities.
- The precise mechanism by which IRBP mediates ocular development remains to be elucidated.
