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Glaucoma: Overview01:25

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...

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A Human Corneal Organ Culture Model of Descemet's Stripping Only with Accelerated Healing Stimulated by Engineered Fibroblast Growth Factor 1
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Gelatinous drop-like corneal dystrophy.

Motokazu Tsujikawa1

  • 1Department of Ophthalmology, Osaka University Medical School, Osaka, Japan. moto@ophthal.med.osaka-u.ac.jp

Cornea
|October 6, 2012
PubMed
Summary

Gelatinous drop-like corneal dystrophy (GDLD) is linked to the TACSTD2 gene. Mutations in this gene destabilize corneal proteins, impairing barrier function and causing vision loss.

Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Gelatinous drop-like corneal dystrophy (GDLD) is a rare, inherited condition.
  • It causes amyloid deposits in the cornea, leading to severe vision impairment and often requiring transplantation.
  • The genetic basis of GDLD has remained largely unknown.

Purpose of the Study:

  • To identify the gene responsible for Gelatinous drop-like corneal dystrophy (GDLD).
  • To investigate the molecular mechanisms underlying GDLD pathogenesis.

Main Methods:

  • Positional cloning was used to identify the disease-causing gene.
  • Genetic analysis was performed on Japanese patients with GDLD.
  • The impact of mutations on corneal epithelial proteins was examined.

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Main Results:

  • The tumor-associated calcium signal transducer 2 (TACSTD2) gene was identified as the cause of GDLD.
  • Four disease-causing mutations in TACSTD2 were found in Japanese patients.
  • Deleterious TACSTD2 mutations were shown to destabilize tight junction proteins (claudins, ZO-1, occludin).

Conclusions:

  • TACSTD2 is the causative gene for Gelatinous drop-like corneal dystrophy.
  • Mutations in TACSTD2 disrupt corneal epithelial barrier function.
  • These findings offer insights into the molecular pathology of GDLD.