Photoreceptor rescue by an abbreviated human RPGR gene in a murine model of X-linked retinitis pigmentosa

B. S. Pawlyk, O. V. Bulgakov, X. Sun, M. Adamian, X. Shu, A. J. Smith, E. L. Berson, R. R. Ali, S. Khani, A. F. Wright, M. A. Sandberg, T. Li

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

The X-linked RP3 gene codes for the ciliary protein RPGR and accounts for over 10% of inherited retinal degenerations. The critical RPGR-ORF15 splice variant contains a highly repetitive purine-rich linker region that renders it unstable and difficult to adapt for gene therapy. To test the hypothesis that the precise length of the linker region is not critical for function, we evaluated whether adeno-associated virus-mediated replacement gene therapy with a human ORF15 variant containing in-frame shortening of the linker region could reconstitute RPGR function in vivo. We delivered human RPGR-ORF15 replacement genes with deletion of most (314 codons, ‘short form’) or 1/3 (126 codons, ‘long form’) of the linker region to Rpgr null mice. Human RPGR-ORF15 expression was detected post treatment with both forms of ORF15 transgenes. However, only the long form correctly localized to the connecting cilia and led to significant functional and morphological rescue of rods and cones. Thus the highly repetitive region of RPGR is functionally important but that moderate shortening of its length, which confers the advantage of added stability, preserves its function. These findings provide a theoretical basis for optimizing replacement gene design in clinical trials for X-linked RP3.
Original languageEnglish
Pages (from-to)196-204
Number of pages9
JournalGene Therapy
Volume23
Issue number2
Early online date8 Sep 2015
DOIs
Publication statusPublished - Feb 2016

Keywords

  • RPGR
  • gene therapy
  • X-linked RP3
  • retinitis pigmentosa
  • Genetic Therapy
  • Promoter Regions, Genetic
  • Alternative Splicing
  • Humans
  • Mice, Inbred C57BL
  • Retinal Cone Photoreceptor Cells/physiology
  • Retinal Rod Photoreceptor Cells/physiology
  • G-Protein-Coupled Receptor Kinase 1/genetics
  • Eye Proteins/genetics
  • Dependovirus/genetics
  • Animals
  • Retinitis Pigmentosa/genetics
  • Mice
  • Disease Models, Animal

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