Genetic rescue models refute nonautonomous rod cell death in retinitis pigmentosa.

Abstract:

:Retinitis pigmentosa (RP) is an inherited neurodegenerative disease, in which the death of mutant rod photoreceptors leads secondarily to the non-cell autonomous death of cone photoreceptors. Gene therapy is a promising treatment strategy. Unfortunately, current methods of gene delivery treat only a fraction of diseased cells, yielding retinas that are a mosaic of treated and untreated rods, as well as cones. In this study, we created two RP mouse models to test whether dying, untreated rods negatively impact treated, rescued rods. In one model, treated and untreated rods were segregated. In the second model, treated and untreated rods were diffusely intermixed, and their ratio was controlled to achieve low-, medium-, or high-efficiency rescue. Analysis of these mosaic retinas demonstrated that rescued rods (and cones) survive, even when they are greatly outnumbered by dying photoreceptors. On the other hand, the rescued photoreceptors did exhibit long-term defects in their outer segments (OSs), which were less severe when more photoreceptors were treated. In summary, our study suggests that even low-efficiency gene therapy may achieve stable survival of rescued photoreceptors in RP patients, albeit with OS dysgenesis.

authors

Koch SF,Duong JK,Hsu CW,Tsai YT,Lin CS,Wahl-Schott CA,Tsang SH

doi

10.1073/pnas.1615394114

subject

Has Abstract

pub_date

2017-05-16 00:00:00

pages

5259-5264

issue

20

eissn

0027-8424

issn

1091-6490

pii

1615394114

journal_volume

114

pub_type

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