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Leber hereditary optic neuropathy.

P Yu-Wai-Man1, D M Turnbull, P F Chinnery

  • 1Department of Neurology, School of Neurosciences and Psychiatry, The Medical School, University of Newcastle Upon Tyne, UK.

Journal of Medical Genetics
|March 19, 2002
PubMed
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Leber hereditary optic neuropathy (LHON) is a rare genetic disease causing vision loss. While specific mutations are common, incomplete penetrance suggests other genetic and environmental factors influence disease development.

Area of Science:

  • Genetics
  • Ophthalmology
  • Neuroscience

Background:

  • Leber hereditary optic neuropathy (LHON) is a mitochondrial genetic disorder.
  • It primarily affects young adult males, causing subacute central vision loss.
  • Over 95% of cases stem from three specific mitochondrial DNA (mtDNA) mutations impacting Complex I.

Purpose of the Study:

  • To review the natural history, diagnosis, and management of LHON.
  • To explore the complex aetiology and pathophysiology of LHON.
  • To discuss factors influencing LHON's incomplete penetrance and gender bias.

Main Methods:

  • Review of natural history and clinical presentation.
  • Analysis of genetic factors, including mtDNA mutations.
  • Discussion of modulating nuclear and environmental factors.

Related Experiment Videos

Main Results:

  • LHON is linked to specific mtDNA mutations (G3460A, G11778A, T14484C).
  • Incomplete penetrance is significant: ~50% of males and ~10% of females with mutations develop optic neuropathy.
  • Secondary genetic and environmental factors likely contribute to disease onset.

Conclusions:

  • LHON's aetiology is complex, involving primary mtDNA mutations and secondary factors.
  • Understanding these factors is crucial for diagnosis, management, and genetic counselling.
  • Further research is needed to define the role of modulating factors in LHON pathophysiology.