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Journal of Virology, August 2002, p. 7651-7660, Vol. 76, No. 15
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.15.7651-7660.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Virus-Mediated Transduction of Murine Retina with Adeno-Associated Virus: Effects of Viral Capsid and Genome Size

Grace S. Yang,1 Michael Schmidt,2 Ziying Yan,3 Jonathan D. Lindbloom,4 Thomas C. Harding,5 Brian A. Donahue,5 John F. Engelhardt,3 Robert Kotin,2 and Beverly L. Davidson4,6,7*

Program in Gene Therapy, Departments of Otolaryngology,1 Internal Medicine,4 Neurology,6 Physiology and Biophysics,7 Anatomy and Cell Biology, University of Iowa College of Medicine, Iowa City, Iowa,3 National Heart, Lung, and Blood Institute, Bethesda, Maryland,2 Cell Genesys Inc., Foster City, California5

Received 22 January 2002/ Accepted 18 April 2002

Gene therapy vectors based on adeno-associated viruses (AAVs) show promise for the treatment of retinal degenerative diseases. In prior work, subretinal injections of AAV2, AAV5, and AAV2 pseudotyped with AAV5 capsids (AAV2/5) showed variable retinal pigmented epithelium (RPE) and photoreceptor cell transduction, while AAV2/1 predominantly transduced the RPE. To more thoroughly compare the efficiencies of gene transfer of AAV2, AAV3, AAV5, and AAV6, we quantified, using stereological methods, the kinetics and efficiency of AAV transduction to mouse photoreceptor cells. We observed persistent photoreceptor and RPE transduction by AAV5 and AAV2 up to 31 weeks and found that AAV5 transduced a greater volume than AAV2. AAV5 containing full-length or half-length genomes and AAV2/5 transduced comparable numbers of photoreceptor cells with similar rates of onset of expression. Compared to AAV2, AAV5 transduced significantly greater numbers of photoreceptor cells at 5 and 15 weeks after surgery (greater than 1,000 times and up to 400 times more, respectively). Also, there were 30 times more genome copies in eyes injected with AAV2/5 than in eyes injected with AAV2. Comparing AAVs with half-length genomes, AAV5 transduced only four times more photoreceptor cells than AAV2 at 5 weeks and nearly equivalent numbers at 15 weeks. The enhancement of transduction was seen at the DNA level, with 50 times more viral genome copies in retinas injected with AAV having short genomes than in retinas injected with AAV containing full-length ones. Subretinal injection of AAV2/6 showed only RPE transduction at 5 and 15 weeks, while AAV2/3 did not transduce retinal cells. We conclude that varying genome length and AAV capsids may allow for improved expression and/or gene transfer to specific cell types in the retina.

* Corresponding author. Mailing address: 200 EMRB, University of Iowa College of Medicine, Iowa City, IA 52242. Phone: (319) 353-5511. Fax: (319) 353-5572. E-mail: beverly-davidson{at}uiowa.edu.

Journal of Virology, August 2002, p. 7651-7660, Vol. 76, No. 15
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.15.7651-7660.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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