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Related Experiment Videos

Macular corneal dystrophy in Iceland.

F Jonasson1, J H Johannsson, A Garner

  • 1University Department of Ophthalmology, Landakot Hospital, Reykjavik, Iceland.

Eye (London, England)
|January 1, 1989
PubMed
Summary

Macular corneal dystrophy in Iceland, a rare genetic eye disease, is more prevalent due to the isolated gene pool. This study examines its clinical, genetic, and histopathological aspects in Icelandic patients.

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Area of Science:

  • Ophthalmology
  • Medical Genetics
  • Population Genetics

Background:

  • Macular corneal dystrophy (MCD) is a rare inherited eye condition affecting corneal clarity.
  • Previous studies suggest genetic factors influence MCD prevalence and presentation.

Purpose of the Study:

  • To investigate the clinical, genetic, and histopathological characteristics of macular corneal dystrophy in an Icelandic cohort.
  • To explore the historical origins and population genetics contributing to MCD prevalence in Iceland.

Main Methods:

  • Clinical data collection from 19 Icelandic patients (14 with penetrating keratoplasty, 5 without).
  • Genealogical analysis to trace disease origins.
  • Histopathological examination, including electron microscopy for specific cases.

Main Results:

  • Clinical presentation and disease course align with existing MCD literature.
  • The gene responsible for MCD was present in Iceland since the 18th century.
  • Despite low consanguinity, a small, isolated Icelandic gene pool contributes to higher MCD prevalence.

Conclusions:

  • The isolated Icelandic population, despite limited consanguinity, exhibits a higher prevalence of macular corneal dystrophy due to its unique genetic makeup.
  • Histopathological findings are consistent with conventional descriptions, with notable exceptions in two severe photophobia cases.
  • Genetic factors and historical gene pool dynamics are crucial in understanding the epidemiology of rare diseases like MCD in isolated populations.

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