Mäkeläinen, S.; Hellsand, M.; van der Heiden, A.D.; Andersson, E.; Thorsson, E.; S. Holst, B.; Häggström, J.; Ljungvall, I.; Mellersh, C.; Hallböök, F.; Andersson, G.; Ekesten, B.; Bergström, T.F. Deletion in the Bardet–Biedl Syndrome Gene TTC8 Results in a Syndromic Retinal Degeneration in Dogs. Genes2020, 11, 1090.
Mäkeläinen, S.; Hellsand, M.; van der Heiden, A.D.; Andersson, E.; Thorsson, E.; S. Holst, B.; Häggström, J.; Ljungvall, I.; Mellersh, C.; Hallböök, F.; Andersson, G.; Ekesten, B.; Bergström, T.F. Deletion in the Bardet–Biedl Syndrome Gene TTC8 Results in a Syndromic Retinal Degeneration in Dogs. Genes 2020, 11, 1090.
Mäkeläinen, S.; Hellsand, M.; van der Heiden, A.D.; Andersson, E.; Thorsson, E.; S. Holst, B.; Häggström, J.; Ljungvall, I.; Mellersh, C.; Hallböök, F.; Andersson, G.; Ekesten, B.; Bergström, T.F. Deletion in the Bardet–Biedl Syndrome Gene TTC8 Results in a Syndromic Retinal Degeneration in Dogs. Genes2020, 11, 1090.
Mäkeläinen, S.; Hellsand, M.; van der Heiden, A.D.; Andersson, E.; Thorsson, E.; S. Holst, B.; Häggström, J.; Ljungvall, I.; Mellersh, C.; Hallböök, F.; Andersson, G.; Ekesten, B.; Bergström, T.F. Deletion in the Bardet–Biedl Syndrome Gene TTC8 Results in a Syndromic Retinal Degeneration in Dogs. Genes 2020, 11, 1090.
Abstract
In golden retriever dogs, a 1 bp deletion in the canine TTC8 gene has been shown to cause progressive retinal atrophy (PRA), the canine equivalent of retinitis pigmentosa. In humans, TTC8 is also implicated in Bardet-Biedl syndrome (BBS). To investigate if the affected dogs only exhibit a non-syndromic PRA or develop a syndromic ciliopathy similar to human BBS, we recruited ten affected dogs to the study. The progression of PRA for two of the dogs was followed for two years, and a rigorous clinical characterization allowed a careful comparison with primary and secondary characteristics of human BBS. In addition to PRA, the dogs showed a spectrum of clinical and morphological signs similar to primary and secondary characteristics of human BBS patients, such as obesity, renal anomalies, sperm defects, and anosmia. We used Oxford Nanopore long-read cDNA sequencing to characterize retinal full-length TTC8 transcripts in affected and non-affected dogs, the results of which suggest that three isoforms are transcribed in the retina, and the 1 bp deletion is a loss-of-function mutation, resulting in a canine form of Bardet-Biedl syndrome with heterogeneous clinical signs.
Biology and Life Sciences, Biochemistry and Molecular Biology
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