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Impaired GSH biosynthesis disrupts eye development, lens morphogenesis and PAX6 function
Brian Thompson1, Ying Chen1, Emily A Davidson2
1Department of Environmental Health Sciences, Yale School of Public Health, Yale University, 60 College Street, New Haven, CT, USA.
The Ocular Surface
|August 23, 2021
Summary
Impaired glutathione (GSH) biosynthesis in ocular tissues leads to severe microphthalmia and disrupts PAX6 function, impacting eye development. This study reveals molecular consequences of GSH deficiency on ocular structures and gene expression.
Area of Science:
- Ophthalmology
- Developmental Biology
- Molecular Biology
Background:
- Glutathione (GSH) is a critical antioxidant, but its role in eye development is not fully understood.
- Impaired GSH biosynthesis can lead to oxidative stress and cellular dysfunction.
Purpose of the Study:
- To investigate the role of GSH biosynthesis in eye development.
- To elucidate the molecular mechanisms by which GSH deficiency affects ocular tissues.
Main Methods:
- Generated knockout mice (Gclcf/f/Le-CreTg/-) with impaired GSH biosynthesis in ocular tissues.
- Performed histological, immunohistochemical, Western blot, and RNA-seq analyses on developing eyes.
- Assessed PAX6 transactivation activity using a luciferase reporter assay in GSH-depleted cells.
Main Results:
- GSH deficiency caused severe microphthalmia with malformations in cornea, iris, lens, and retina.
- Downregulation of crystallin and lens fiber cell genes, upregulation of immune response genes in KO mouse lenses.
- Impaired PAX6 transactivation activity was observed in GSH-depleted cells.
Conclusions:
- Impaired ocular GSH biosynthesis disrupts eye development and PAX6 function.
- GSH is essential for maintaining ocular structure and function during development.
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