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Retinal structure and function in achromatopsia: implications for gene therapy.

Venki Sundaram1, Caroline Wilde2, Jonathan Aboshiha1

  • 1UCL Institute of Ophthalmology, University College London, London, UK; Moorfields Eye Hospital, London, UK.

Ophthalmology
|October 24, 2013
PubMed
Summary
This summary is machine-generated.

Retinal structure in achromatopsia (ACHM) shows varied photoreceptor integrity, not strongly correlated with age. This suggests a broader window for gene therapy intervention based on individual retinal structure, not just age.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Retinal Imaging

Background:

  • Achromatopsia (ACHM) is a severe inherited retinal disease characterized by reduced visual acuity, photophobia, and color blindness.
  • Genetic defects in cone photoreceptors lead to ACHM, necessitating characterization for therapeutic development.

Purpose of the Study:

  • To comprehensively assess retinal structure and function in achromatopsia (ACHM) patients.
  • To establish baseline data for evaluating the efficacy of future gene therapy clinical trials.

Main Methods:

  • Cross-sectional study involving 40 ACHM subjects.
  • Spectral domain optical coherence tomography (SD-OCT) for foveal structure grading and thickness measurements.
  • Microperimetry for retinal sensitivity and molecular genetic testing for genotype determination.

Main Results:

  • Disease-causing variants identified in CNGA3, CNGB3, GNAT2, and PDE6C genes.
  • Varied foveal structure observed: continuous inner segment ellipsoid (ISe) layer in 22.5%, ISe disruption in 27.5%, absent ISe in 20%, hyporeflective zone (HRZ) in 22.5%, and outer retinal atrophy in 7.5%.
  • No significant correlation found between age and retinal structure (foveal thickness, ONL thickness) or function (retinal sensitivity, fixation stability).

Conclusions:

  • The lack of age-related decline in retinal structure suggests a wider therapeutic window for gene therapy in ACHM.
  • Photoreceptor structure, assessed by SD-OCT, is a more reliable predictor of potential benefit than chronological age.
  • Imaging techniques like SD-OCT are crucial for selecting participants and monitoring outcomes in ACHM gene therapy trials.