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Related Experiment Video

Updated: May 10, 2026

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
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Mitochondrial retinal dystrophy associated with the m.3243A>G mutation.

Paul de Laat1, Jan A M Smeitink1, Mirian C H Janssen2

  • 1Radboud University Nijmegen Medical Centre, Department of Pediatrics, Nijmegen Centre for Mitochondrial Disorders, Nijmegen, The Netherlands.

Ophthalmology
|June 29, 2013
PubMed
Summary

The m.3243A>G mitochondrial mutation causes specific retinal abnormalities graded into four stages. Retinal dystrophy severity correlates with age and visual acuity, not heteroplasmy levels.

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Area of Science:

  • Genetics
  • Ophthalmology
  • Mitochondrial Diseases

Background:

  • The m.3243A>G mutation in the MTTL1 gene is linked to mitochondrial diseases.
  • Retinal abnormalities are a known manifestation, but their spectrum and correlation with disease severity require further elucidation.

Purpose of the Study:

  • To characterize the range of retinal abnormalities in patients with the m.3243A>G mutation.
  • To investigate correlations between the severity of retinal changes, systemic disease involvement, and mutation heteroplasmy levels.

Main Methods:

  • Observational, cohort-based, cross-sectional study of 29 m.3243A>G mutation carriers.
  • Comprehensive eye examinations including fundus photography, autofluorescence (FAF), and optical coherence tomography (OCT).
  • Measurement of mutation heteroplasmy in leukocytes, urinary epithelial cells, and buccal mucosa; assessment of systemic disease using the Newcastle Mitochondrial Disease Adult Scale (NMDAS).

Main Results:

  • 86% of patients exhibited retinal abnormalities, classified into 4 grades.
  • Retinal dystrophy severity significantly correlated with patient age and visual acuity (P < 0.01).
  • No significant correlation was found between retinal dystrophy grade and heteroplasmy levels or overall systemic disease severity.

Conclusions:

  • Mitochondrial retinal dystrophy associated with the m.3243A>G mutation presents distinct, classifiable features.
  • The grade of retinal dystrophy correlates with age and visual acuity.
  • Potential for misdiagnosis exists due to variable systemic associations and masked maternal inheritance patterns.