ArticleInvestigative ophthalmology & visual science2024
Zebrafish Optical Development Requires Regulated Water Permeability by Aquaporin 0.
Article in Investigative ophthalmology & visual science, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- CatExperimental eye research · 2026Article
- Contributions of aquatic organisms to understanding the vertebrate ocular lens.Frontiers in ophthalmology · 2026Review
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4 authors.
Funding
Abstract
Purpose: Optical development of the zebrafish eye relies on the movement of the highly refractive lens nucleus from an anterior to a central location in the optical axis during development. We have shown that this mechanism in turn depends on the function of Aquaporin 0a (Aqp0a), a multifunctional and extremely abundant protein in lens fiber cell membranes. Here, we probe the specific cellular functions necessary for rescuing lens nucleus centralization defects in aqp0a-/- null mutants by stable overexpression of an Aqp0 orthologue from a killifish, MIPfun. Methods: We test in vivo requirements for lens transparency and nucleus centralization of MIPfun for auto-adhesion, water permeability (Pf), and Pf sensitivity to regulation by Ca2+ or pH by overexpression of MIPfun mutants previously shown to have defects in these functions in vitro or in silico. Results: Water permeability of MIPfun is essential for rescuing lens transparency and nucleus centralization defects, whereas auto-adhesion is not. Furthermore, water permeability regulation by Ca2+ and pH appear residue-dependent, because some Ca2+-insensitive mutants fail to rescue, and pH-insensitive mutants only partially rescue defects. MIPfun lacking Pf sensitivity to both, Ca2+ and pH, also fails to rescue lens nucleus centralization. Conclusion: This study shows that regulation of water permeability by Aqp0 plays a key role in the centralization of the zebrafish lens nucleus, providing the first direct evidence for water transport in this aspect of optical development.
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