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Ocular gene transfer with self-complementary AAV vectors.

Katsutoshi Yokoi1, Shu Kachi, H Steve Zhang

  • 1Department of Ophthalmology, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-9277, USA.

Investigative Ophthalmology & Visual Science
|June 27, 2007
PubMed
Summary
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Self-complementary AAV (scAAV) vectors demonstrate faster and more robust transgene expression in retinal cells compared to single-stranded AAV (ssAAV) vectors. These findings highlight scAAV’s potential for ocular gene therapy, especially for retinal diseases.

Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Gene Therapy

Background:

  • Self-complementary adeno-associated virus (scAAV) vectors offer enhanced transgene expression by bypassing second-strand DNA synthesis.
  • scAAV vectors are being explored to improve gene delivery efficiency in ocular tissues.

Purpose of the Study:

  • To evaluate the efficacy of intraocular injections of type 2 scAAV.GFP in mice.
  • To compare the transgene expression kinetics of scAAV.GFP with single-stranded AAV.GFP (ssAAV.GFP) after ocular administration.

Main Methods:

  • Dose-response experiments were conducted comparing scAAV type 2 (scAAV2) and single-stranded AAV type 2 (ssAAV2) vectors.
  • Vectors encoded an identical expression cassette for green fluorescent protein (GFP).
  • Injections were administered via subretinal and intravitreous routes.

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Main Results:

  • Subretinal injection of scAAV.CMV-GFP led to rapid and widespread GFP expression in retinal pigment epithelial (RPE) cells within 3-7 days.
  • ssAAV.CMV-GFP required 14 days to achieve comparable expression levels in RPE cells.
  • scAAV.CMV-GFP demonstrated significantly faster and more robust expression in photoreceptors and other retinal neurons compared to ssAAV.CMV-GFP.

Conclusions:

  • scAAV vectors show promise for ocular gene therapy due to their rapid and robust transgene expression.
  • These vectors may be particularly beneficial for retinal diseases requiring swift therapeutic effects in photoreceptor cells.