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Preserved visual function in retinal dystrophy due to hypomorphic RPE65 mutations.

Sarah Hull1,2, Graham E Holder1,2, Anthony G Robson1,2

  • 1UCL Institute of Ophthalmology, London, UK.

The British Journal of Ophthalmology
|February 25, 2016
PubMed
Summary
This summary is machine-generated.

Mild RPE65 retinal dystrophy, caused by hypomorphic mutations, preserves vision into adulthood. Early gene therapy may be crucial for optimal visual recovery in patients with RPE65 mutations.

Keywords:
DystrophyElectrophysiologyGeneticsImagingVision

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Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Investigating atypical, mild, recessive RPE65-related retinal dystrophy.
  • Focusing on four families with early-onset disease.
  • Analyzing detailed phenotypic and molecular findings.

Observation:

  • Patients presented with childhood nyctalopia but maintained good visual acuity past 19 years.
  • Generalized retinal dysfunction was observed via electroretinography.
  • Optical coherence tomography showed preserved central macular thickness in patients with good visual acuity.

Findings:

  • RPE65 mutations identified in all patients, including three missense variants suggesting hypomorphic alleles.
  • One patient exhibited fundus albipunctatus-like retinal findings with partial rod function recovery.
  • Mild RPE65 dystrophy is linked to preserved visual acuity into adulthood.

Implications:

  • Hypomorphic RPE65 mutations can cause mild retinal dystrophy and fundus albipunctatus-like features.
  • Gene replacement therapy's success may depend on earlier administration in childhood.
  • Transduction efficiency might not be the sole limiting factor for visual acuity improvement.