OMIA:001977-9615 : Retinal atrophy, progressive, CNGA1-related in Canis lupus familiaris (dog)

Categories: Vision / eye phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 613756 (trait) , 123825 (gene)

Links to relevant human diseases in MONDO:

Mendelian trait/disorder: yes

Mode of inheritance: Autosomal recessive

Considered a defect: yes

Key variant known: yes

Year key variant first reported: 2015

Species-specific name: PRA, rod-cone degeneration

Mapping: As reported by Wiik et al. (2015), "Using genome-wide association with 15 Shetland Sheepdog (Sheltie) cases and 14 controls, we identified a novel PRA locus on CFA13 (Praw = 8.55 × 10(-7) , Pgenome = 1.7 × 10(-4) ). CNGA1, which is known to be involved in human cases of retinitis pigmentosa, was located within the associated region and was considered a likely candidate gene."

Molecular basis: As reported by Wiik et al. (2015), "Sequencing of [the above candidate] gene identified a 4-bp deletion in exon 9 (c.1752_1755delAACT), leading to a frameshift and a premature stop codon". Pedigree analysis indicated that this is a likely causal mutation in some, but not all, Sheltie families.

Breed: Shetland Sheepdog (Dog) (VBO_0201217).
Breeds in which the phene has been documented. (If a likely causal variant has been documented for the phene, see the variant table breeds in which the variant has been reported).

Associated gene:

Symbol Description Species Chr Location OMIA gene details page Other Links
CNGA1 cyclic nucleotide gated channel alpha 1 Canis lupus familiaris 13 NC_051817.1 (44464133..44430864) CNGA1 Homologene, Ensembl , NCBI gene


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WARNING! Inclusion of a variant in this table does not automatically mean that it should be used for DNA testing. Anyone contemplating the use of any of these variants for DNA testing should examine critically the relevant evidence (especially in breeds other than the breed in which the variant was first described). If it is decided to proceed, the location and orientation of the variant sequence should be checked very carefully.

Since October 2021, OMIA includes a semiautomated lift-over pipeline to facilitate updates of genomic positions to a recent reference genome position. These changes to genomic positions are not always reflected in the ‘acknowledgements’ or ‘verbal description’ fields in this table.

OMIA Variant ID Breed(s) Variant Phenotype Gene Allele Type of Variant Source of Genetic Variant Reference Sequence Chr. g. or m. c. or n. p. Verbal Description EVA ID Year Published PubMed ID(s) Acknowledgements
547 Shetland Sheepdog (Dog) Progressive retinal atrophy, due to CNGA1 mutations CNGA1 deletion, small (<=20) Naturally occurring variant CanFam3.1 13 g.43831897_43831900del c.1752_1755del p.(T585Sfs*7) NM_001003222.1; published as c.1752_1755delAACT 2015 26202106 Genomic and protein coordinates in CanFam3.1 provided by Robert Kuhn

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2023). OMIA:001977-9615: Online Mendelian Inheritance in Animals (OMIA) [dataset].


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.

2023 Ghilardi, S., Bagardi, M., Frattini, S., Barbariga, G.E., Brambilla, P.G., Minozzi, G., Polli, M. :
Genotypic and allelic frequencies of progressive rod-cone degeneration and other main variants associated with progressive retinal atrophy in Italian dogs. Vet Rec Open 10:e77, 2023. Pubmed reference: 38028226. DOI: 10.1002/vro2.77.
2021 Genetics Committee of the American College of Veterinary Opthalmologists :
The Blue Book: Ocular disorders presumed to be inherited in purebred dogs. 13th Edition , 2021.
2015 Wiik, A.C., Ropstad, E.O., Ekesten, B., Karlstam, L., Wade, C.M., Lingaas, F. :
Progressive retinal atrophy in Shetland sheepdog is associated with a mutation in the CNGA1 gene. Anim Genet 46:515-21, 2015. Pubmed reference: 26202106. DOI: 10.1111/age.12323.

Edit History

  • Created by Frank Nicholas on 31 Dec 2015
  • Changed by Frank Nicholas on 31 Dec 2015
  • Changed by Imke Tammen2 on 11 Jun 2023