Abstract
Primary cataracts (CAT) are characterized as any form of opacities of the eye lenses and are not accompanied by other diseases. CAT may impair vision depending on their size, location, and their state of progression. In order to investigate the cause of congenital or juvenile CAT in inbred Angolan lions kept in German zoos, we analyzed the genomic sequences of 4 crystalline genes CRYAA, CRYAB, CRYBB2, and CRYBB1. In addition, 10 CAT candidate genes (GJA3, LIM2, CRYGA, CRYGB, CRYGC, CRYGD CRYGS, BFSP2, CRYBA4, and CRYBB1) were analyzed using adjacent microsatellites. We identified 10 single nucleotide polymorphisms in the Angolan lion crystalline genes and 9 segregating microsatellites. Nonparametric and parametric linkage analyses did not reveal any linkage between one of the analyzed markers and CAT. So, we concluded that these genes can be excluded as causative for the familial primary cataract phenotype in these Angolan lions.
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