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Sci Rep. 2015 Feb 10;5:8366. doi: 10.1038/srep08366.

CRISPR-engineered mosaicism rapidly reveals that loss of Kcnj13 function in mice mimics human disease phenotypes.

Author information

1
Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030.
2
1] HGSC, Baylor College of Medicine, Houston, TX 77030 [2] Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030.
3
1] HGSC, Baylor College of Medicine, Houston, TX 77030 [2] Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030 [3] Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030.
4
1] Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030 [2] Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030 [3] Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030 [4] Department of Neuroscience, Baylor College of Medicine, Houston, TX 77030 [5] Department of Ophthalmology, Baylor College of Medicine, Houston, TX 77030.

Abstract

The era of genomics has demanded the development of more efficient and timesaving approaches to validate gene function in disease. Here, we utilized the CRISPR-Cas9 system to generate Kcnj13 mutant mice by zygote injection to verify the pathogenic role of human KCNJ13, mutations of which are thought to cause Leber congenital amaurosis (LCA), an early-onset form of blindness. We found that complete loss of Kcnj13 is likely postnatal lethal. Among surviving F0-generation mice examined, 80% show mosaic KCNJ13 expression in the retinal pigment epithelium (RPE). Mosaic expression correlates with decreased response to light and photoreceptor degeneration, indicating that Kcnj13 mutant mice mimic human KCNJ13-related LCA disease. Importantly, mosaic animals enable us to directly compare Kcnj13 mutant and wild-type RPE cells in the same eye. We found that RPE cells lacking KCNJ13 protein still survive but overlying photoreceptors exhibit cell degeneration. At the same time, wild-type RPE cells can rescue neighboring photoreceptor cells that overlie mutant RPE cells. These results suggest that KCNJ13 expression is required for RPE cells to maintain photoreceptor survival. Moreover, we show that CRISPR-Cas9 engineered mosaicism can be used to rapidly test candidate gene function in vivo.

PMID:
25666713
PMCID:
PMC4322368
DOI:
10.1038/srep08366
[Indexed for MEDLINE]
Free PMC Article

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