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Related Experiment Videos

SOD1: a candidate gene for keratoconus.

Nitin Udar1, Shari R Atilano, Donald J Brown

  • 1Jules Stein Eye Institute, University of California Los Angeles, 92868, USA.

Investigative Ophthalmology & Visual Science
|August 1, 2006
PubMed
Summary

A novel deletion in the SOD1 gene was found in familial keratoconus (KC) patients, leading to altered SOD1 transcripts. This suggests SOD1 may be a candidate gene for KC, potentially increasing oxidative stress.

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Area of Science:

  • Genetics
  • Ophthalmology
  • Molecular Biology

Background:

  • Keratoconus (KC) is a progressive thinning of the cornea.
  • The genetic basis of familial KC is not fully understood.
  • Superoxide dismutase 1 (SOD1) is located on chromosome 21.

Purpose of the Study:

  • To investigate the superoxide dismutase 1 (SOD1) gene on chromosome 21 as a potential candidate gene for familial keratoconus (KC).

Main Methods:

  • Genomic DNA from 15 KC families and 156 controls was analyzed.
  • All five exons of the SOD1 gene were sequenced.
  • Polymerase chain reaction (PCR), restriction digestion, and RNA analysis were performed to identify genetic variants and splice variants.

Main Results:

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  • A heterozygous 7-base deletion in SOD1 intron 2 was identified in two KC families.
  • This deletion segregated with KC in one family and was absent in 312 control chromosomes.
  • RNA analysis revealed SOD1 splice variants (LE2 and LE2E3) lacking critical exons in an affected individual.

Conclusions:

  • A unique deletion in SOD1 intron 2 was found in KC patients, associated with aberrant SOD1 transcripts.
  • These splice variants may result in non-functional SOD1 protein, potentially increasing oxidative stress.
  • Further research is needed to confirm a causal link between SOD1 alterations and keratoconus.