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Retinal structure, function, and molecular pathologic features in gyrate atrophy.

Panagiotis I Sergouniotis1, Alice E Davidson, Eva Lenassi

  • 1Institute of Ophthalmology, University College London, London, United Kingdom.

Ophthalmology
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

This study details the varied symptoms and new gene mutations in gyrate atrophy patients. Advanced imaging reveals retinal changes, while genetic analysis identifies novel ornithine aminotransferase (OAT) mutations.

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Area of Science:

  • Ophthalmology
  • Medical Genetics
  • Retinal Diseases

Background:

  • Gyrate atrophy is an inherited chorioretinal dystrophy.
  • It is caused by mutations in the ornithine aminotransferase (OAT) gene.
  • Phenotypic variability and novel mutations require further investigation.

Purpose of the Study:

  • To characterize the phenotypic diversity in patients with gyrate atrophy.
  • To identify and report new mutations in the OAT gene associated with the condition.
  • To correlate genotype with clinical, structural, and functional findings.

Main Methods:

  • Retrospective case series of seven unrelated patients.
  • Comprehensive ophthalmologic examinations including fundus photography, fundus autofluorescence (FAF), spectral-domain optical coherence tomography (SD-OCT), and microperimetry.
  • Genetic analysis of the OAT gene, including sequencing and mRNA analysis from peripheral blood leukocytes.

Main Results:

  • FAF imaging showed distinct patterns of signal alteration in all patients.
  • SD-OCT revealed intraretinal cysts and hyperreflective deposits; outer retinal tubulation was observed in older patients.
  • Nine OAT mutations were identified, including four novel mutations. Macular function was preserved over areas of normal autofluorescence but reduced elsewhere.

Conclusions:

  • Fundus autofluorescence is valuable for assessing neurosensory dysfunction in gyrate atrophy.
  • Macular edema and outer retinal tubulation are key findings, varying with disease stage.
  • Leukocyte RNA analysis enhances mutation detection sensitivity for the OAT gene.