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GBF1 deficiency causes cataracts in human and mouse.
Weimin Jia1, Chenming Zhang2, Yalin Luo1
1Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan, China.
Human Genetics
|August 7, 2024
Summary
Genetic analysis identified a mutation in the GBF1 gene as a cause of congenital cataracts. This GBF1 deficiency activates the unfolded protein response and enhances autophagy, potentially leading to lens opacity.
Area of Science:
- Ophthalmology
- Genetics
- Cell Biology
Background:
- Congenital cataracts are lens opacities present at birth, with unclear underlying mechanisms.
- Lens epithelium cells are vital for maintaining lens transparency and homeostasis.
- Previous studies have identified several causative genes for congenital cataracts, but a comprehensive understanding is lacking.
Purpose of the Study:
- To identify the genetic cause of congenital cataracts in a large family.
- To elucidate the functional consequences of the identified genetic mutation.
- To explore the molecular mechanisms linking GBF1 deficiency to lens opacity.
Main Methods:
- Genetic analysis of a family with congenital cataracts.
- Functional studies using human lens epithelium cell lines.
- GBF1 protein level assessment and gene knockdown experiments.
- Investigation of the unfolded protein response (UPR) and autophagy pathways.
- Phenotypic analysis of heterozygous Gbf1 knockout mice.
Main Results:
- A heterozygous mutation (c.3857 C>T, p.T1287I) in the GBF1 gene was identified in all affected family members.
- The GBF1 mutation reduced GBF1 protein levels in human lens epithelium cells.
- GBF1 knockdown activated the unfolded protein response (XBP1s) and enhanced autophagy independently of mTOR.
- Heterozygous Gbf1 knockout mice exhibited a cataract phenotype.
Conclusions:
- GBF1 is identified as a novel causative gene for congenital cataracts.
- GBF1 deficiency leads to the activation of the unfolded protein response.
- Enhanced autophagy, independent of mTOR, is a consequence of GBF1 deficiency and may contribute to lens opacity.
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