Frameshift Deletion in Wirehaired Pointing Griffon Dogs with Juvenile Cataract.

Different breed-specific inherited cataracts have been described in dogs. In this study, we investigated an inbred family of Wirehaired Pointing Griffon dogs in which three offspring were affected by juvenile cataract. The pedigree suggested monogenic autosomal recessive inheritance of the trait. Whole-genome sequencing of an affected dog revealed 12 protein-changing variants that were not present in 566 control genomes, of which two were located in functional candidate genes, and . Targeted genotyping of both variants in the investigated family excluded and revealed perfect co-segregation of the variant with the juvenile cataract phenotype. This variant, :c.2024delG, represents a 1 bp frameshift deletion predicted to truncate ~50% of the open reading frame p.(Ser675Thrfs*5). encodes the FYVE and coiled-coil domain autophagy adaptor 1, a known regulator of lens autophagy, which is required for the normal homeostasis in the eye. In humans, at least 37 pathogenic variants in have been shown to cause autosomal recessive cataract. knockout mice also develop cataracts. Together with the current knowledge on variants and their functional impact in humans and mice, our data strongly suggest :c.2024delG as a candidate causative variant for the observed juvenile cataract in Wirehaired Pointing Griffon dogs. To the best of our knowledge, this study represents the first report of a -related cataract in domestic animals.