Gucy2f zebrafish knockdown-a model for Gucy2d-related leber congenital amaurosis

Hadas Stiebel-Kalish, Ehud Reich, Nir Rainy, Gad Vatine, Yael Nisgav, Anna Tovar, Yoav Gothilf, Michael Bach

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Mutations in retinal-specific guanylate cyclase (Gucy2d) are associated with Leber congenital amaurosis-1 (LCA1). Zebrafish offer unique advantages relative to rodents, including their excellent color vision, precocious retinal development, robust visual testing strategies, low cost, relatively easy transgenesis and shortened experimental times. In this study we will demonstrate the feasibility of using gene-targeting in the zebrafish as a model for the photoreceptor-specific GUCY2D-related LCA1, by reporting the visual phenotype and retinal histology resulting from Gucy2f knockdown. Gucy2f zebrafish LCA-orthologous cDNA was identified and isolated by PCR amplification. Its expression pattern was determined by whole-mount in-situ hybridization and its function was studied by gene knockdown using two different morpholino-modified oligos (MO), one that blocks translation of Gucy2f and one that blocks splicing of Gucy2f. Visual function was assessed with an optomotor assay on 6-days-post-fertilization larvae, and by analyzing changes in retinal histology. Gucy2f knockdown resulted in significantly lower vision as measured by the optomotor response compared with uninjected and control MO-injected zebrafish larvae. Histological changes in the Gucy2f-knockdown larvae included loss and shortening of cone and rod outer segments. A zebrafish model of Gucy2f-related LCA1 displays early visual dysfunction and photoreceptor layer dystrophy. This study serves as proof of concept for the use of zebrafish as a simple, inexpensive model with excellent vision on which further study of LCA-related genes is possible.

Original languageEnglish
Pages (from-to)884-889
Number of pages6
JournalEuropean Journal of Human Genetics
Volume20
Issue number8
DOIs
StatePublished - 1 Aug 2012
Externally publishedYes

Keywords

  • GUCY2D
  • animal model
  • leber congenital amaurosis
  • optomotor assay

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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