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Laser Capture Microdissection of Highly Pure Trabecular Meshwork from Mouse Eyes for Gene Expression Analysis
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Somatic Mutations within Myocilin due to Aging May Be a Potential Risk Factor for Glaucoma.

Yevgeniy Sazhnyev1,2,3, Akaash Venkat1,4, Jie J Zheng1,5

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|February 24, 2024
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Somatic mutations in the myocilin (MYOC) gene may contribute to glaucoma. Accumulation of these mutations in trabecular meshwork cells, potentially due to UV exposure, could lead to vision loss.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Cell Biology

Background:

  • Glaucoma is a leading cause of irreversible vision loss.
  • Aging and family history are key risk factors for glaucoma.
  • Myocilin (MYOC) gene mutations are linked to open-angle glaucoma, causing endoplasmic reticulum (ER) stress and trabecular meshwork (TM) cell death, leading to elevated intraocular pressure (IOP).

Purpose of the Study:

  • To investigate the role of somatic mutations in the MYOC gene in glaucoma development.
  • To explore the potential link between MYOC somatic mutations and pathogenic glaucoma variants.

Main Methods:

  • Analysis of MYOC somatic mutations found in cancer.
  • Comparison of somatic mutations with known pathogenic glaucoma variants.
  • Consideration of TM cell susceptibility to somatic mutation accumulation.

Main Results:

  • A significant overlap was observed between MYOC somatic cancer mutations and pathogenic glaucoma variants.
  • Trabecular meshwork cells are prone to rapid somatic mutation accumulation, possibly due to UV exposure.

Conclusions:

  • Somatic mutations in the MYOC gene are proposed as a significant contributor to glaucoma onset.
  • This mechanism may explain glaucoma development in individuals without known germline MYOC mutations.