151. Genome-wide association study and whole-genome sequencing identify a deletion in LRIT3 associated with canine congenital stationary night blindness
- Author
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Kendall Carlin, Keiko Miyadera, Gustavo D. Aguirre, Raghavi Sudharsan, Tosso Leeb, Yuji Nishizawa, Orly Goldstein, Vidhya Jagannathan, Evelyn Santana, Rueben G. Das, Doreen Becker, and Mineo Kondo
- Subjects
0301 basic medicine ,Male ,Heterozygote ,Mutant ,lcsh:Medicine ,Locus (genetics) ,Genome-wide association study ,610 Medicine & health ,Biology ,Genome-wide association studies ,Chromosomes ,Retina ,Article ,03 medical and health sciences ,0302 clinical medicine ,Dogs ,Night Blindness ,medicine ,Myopia ,Animals ,Dog Diseases ,lcsh:Science ,Whole genome sequencing ,Genetics ,Congenital stationary night blindness ,Multidisciplinary ,Whole Genome Sequencing ,630 Agriculture ,lcsh:R ,Metabotropic glutamate receptor 6 ,Membrane Proteins ,Heterozygote advantage ,Eye Diseases, Hereditary ,Genetic Diseases, X-Linked ,3. Good health ,030104 developmental biology ,medicine.anatomical_structure ,590 Animals (Zoology) ,570 Life sciences ,biology ,lcsh:Q ,Female ,030217 neurology & neurosurgery ,Gene Deletion ,Genome-Wide Association Study - Abstract
Congenital stationary night blindness (CSNB), in the complete form, is caused by dysfunctions in ON-bipolar cells (ON-BCs) which are secondary neurons of the retina. We describe the first disease causative variant associated with CSNB in the dog. A genome-wide association study using 12 cases and 11 controls from a research colony determined a 4.6 Mb locus on canine chromosome 32. Subsequent whole-genome sequencing identified a 1 bp deletion in LRIT3 segregating with CSNB. The canine mutant LRIT3 gives rise to a truncated protein with unaltered subcellular expression in vitro. Genetic variants in LRIT3 have been associated with CSNB in patients although there is limited evidence regarding its apparently critical function in the mGluR6 pathway in ON-BCs. We determine that in the canine CSNB retina, the mutant LRIT3 is correctly localized to the region correlating with the ON-BC dendritic tips, albeit with reduced immunolabelling. The LRIT3-CSNB canine model has direct translational potential enabling studies to help understand the CSNB pathogenesis as well as to develop new therapies targeting the secondary neurons of the retina.
- Published
- 2019