Cited by 88Retinal Development and DisordersVirus-based gene therapy researchRetinal Diseases and Treatments

Preclinical dose-escalation study of intravitreal AAV-RS1 gene therapy in a mouse model of X-linked retinoschisis: dose-dependent expression and improved retinal structure and function

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Bush, Ronald A., Zeng, Yong, Colosi, Peter, Kjellstrom, Sten, Hiriyanna, Suja, Vijayasarathy, Camasamudram, Santos, Maria, Li, Jinbo +2 more·2016·Human Gene Therapy

Abstract

Gene therapy for inherited retinal diseases has been shown to ameliorate functional and structural defects in both animal models and in human clinical trials. X-linked retinoschisis (XLRS) is an early-age onset macular dystrophy resulting from loss of an extracellular matrix protein (RS1). In preparation for a human clinical gene therapy trial, we conducted a dose-range efficacy study of the clinical vector, a self-complementary AAV delivering a human retinoschisin (RS1) gene under control of the RS1 promoter and an interphotoreceptor binding protein enhancer (AAV8-scRS/IRBPhRS), in the retinoschisin knockout (Rs1-KO) mouse. The therapeutic vector at 1 × 10(6) to 2.5 × 10(9) (1E6-2.5E9) vector genomes (vg)/eye or vehicle was administered to one eye of 229 male Rs1-KO mice by intravitreal injection at 22 ± 3 days postnatal age (PN). Analysis of retinal function (dark-adapted electroretinogram, ERG), structure (cavities and outer nuclear layer thickness) by in vivo retinal imaging using optical coherence tomography, and retinal immunohistochemistry (IHC) for RS1 was done 3-4 months and/or 6-9 months postinjection (PI). RS1 IHC staining was dose dependent across doses ≥1E7 vg/eye, and the threshold for significant improvement in all measures of retinal structure and function was 1E8 vg/eye. Higher doses, however, did not produce additional improvement. At all doses showing efficacy, RS1 staining in Rs1-KO mouse was less than that in wild-type mice. Improvement in the ERG and RS1 staining was unchanged or greater at 6-9 months than at 3-4 months PI. This study demonstrates that vitreal administration of AAV8 scRS/IRBPhRS produces significant improvement in retinal structure and function in the mouse model of XLRS over a vector dose range that can be extended to a human trial. It indicates that a fully normal level of RS1 expression is not necessary for a therapeutic effect.

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  • AAV-mediated RS1 expression in the Rs1-knockout mouse improved retinal structure, with fewer cavities, and function, as measured by electroretinogram.

    “AAV-mediated augmentation of human RS1 expression in the Rs1-knockout mouse led to improved retinal structure (reduced retinal cavities) and function (electroretinogram response)”

    From Correcting visual loss by genetics and prosthetics (2020) · cites this paper as Bush 2016

  • Early results from a phase I human trial of RS1 gene therapy showed possible closure of parafoveal schisis cavities in at least one patient.

    “while early results from a phase I human trial has demonstrated potential closure of parafoveal schisis cavities in at least one patient [Bush 2016, Cukras 2018].”

    From Correcting visual loss by genetics and prosthetics (2020) · cites this paper as Bush 2016

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Authors
Bush, R. A., Zeng, Y., Colosi, P., Kjellstrom, S., Hiriyanna, S., Vijayasarathy, C., Santos, M., Li, J., Wu, Z., & Sieving, P. A.
Affiliations
  • National Institutes of Health (US)
  • National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, Maryland.
  • National Eye Institute, National Institutes of Health, Bethesda, Maryland.
Venue
Human Gene Therapy
Published
2016-05
Volume
27
Issue
5
Pages
376-389
ISSN
  • 1043-0342 (ISSN-L)
  • 1557-7422
OpenAlex
W2318885789
Cited by
86
References
43
Citations by year
2026: 6 · 2025: 10 · 2024: 15 · 2023: 6 · 2022: 12 · 2021: 11 · 2020: 9 · 2019: 4 · 2018: 9 · 2017: 3 · 2016: 1
FWCI
2.95
Type
journal article
Language
en
Open access
Locations
  • Human Gene Therapy (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
Funders
  • National Institutes of Health
  • National Eye Institute
  • National Institute on Deafness and Other Communication Disorders
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
Keywords
X-linked retinoschisis, retinoschisin, intravitreal gene therapy, dose escalation, retinal function, electroretinogram, retinal structure, outer nuclear layer thickness, macular dystrophy
MeSH terms
Dependovirus, Animals, Disease Models, Animal, Electroretinography, Eye Proteins, Genetic Vectors, Immunohistochemistry, Male, Retina, Time Factors, Transduction, Genetic, Genetic Therapy, Cell Adhesion Molecules, Gene Expression, Mice, Knockout, Retinoschisis, Tomography, Optical Coherence, Genes, X-Linked, Mice, Intravitreal Injections

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