OMIA:001553-9615 : Multifocal retinopathy 2 in Canis lupus familiaris (dog)

Categories: Vision / eye phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 153700 (trait) , 611809 (trait) , 193220 (trait) , 613194 (trait) , 607854 (gene)

Mendelian trait/disorder: yes

Mode of inheritance: Autosomal recessive

Considered a defect: yes

Key variant known: yes

Year key variant first reported: 2007

Cross-species summary: This disorder has been renamed in OMIA on the basis of the review by Miyadera et al. (2012)

Species-specific name: cmr2

Species-specific description: Canine multifocal retinopathy (cmr) is an ocular disorder characterized by multiple areas of retinal degeneration. The detection of three different mutations in the one gene (BEST1) has led to the naming of three different forms of the disorder (cmr1 [OMIA001444-9615], cmr2 [OMIA001553-9615], cmr3 [OMIA001554-9615]), all of which are very similar clinically. The form of cmr detailed in this entry (cmr2) occurs in the Coton du Tulear breed.

Mapping: CFA18

Molecular basis: The causative mutation for cmr2 in the Coton de Tulear is a G to A missense mutation in BEST1 (Guziewicz et al., 2007).

Clinical features: Signs of cmr include multiple tan-pink subretinal patches in both the tapetal and the non-tapetal fundus along with focal areas of tapetal hyper-reflectivity. The lesions elevate the retina, progressing as the dog ages, to focal areas of retinal degeneration and retinal pigment epithelial hypertrophy and pigmentation (Grahn et al., 1998).

Pathology: In retinal histology there are multiple areas of retinal pigment epithelial vacuolation, hypertrophy, apparent separation from Bruch’s membrane, and multiple serous retinal detachments (Grahn et al., 1998).

Control: Relatives of affected dogs should be tested. Breeding of affected or carrier animals is not recommended. If carriers must be bred, it should be bred only to a tested, homozygous normal dog.

Genetic testing: There are tests available to detect the known causative mutations.

Breed: Coton de Tulear (Dog) (VBO_0200389).
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
BEST1 bestrophin 1 Canis lupus familiaris 18 NC_051822.1 (55534952..55522441) BEST1 Homologene, Ensembl , NCBI gene


By default, variants are sorted chronologically by year of publication, to provide a historical perspective. Readers can re-sort on any column by clicking on the column header. Click it again to sort in a descending order. To create a multiple-field sort, hold down Shift while clicking on the second, third etc relevant column headers.

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
59 Coton de Tulear (Dog) Multifocal retinopathy 2 BEST1 cmr2 missense Naturally occurring variant CanFam3.1 18 g.54476143C>T c.482G>A p.(G161D) NM_001097545.1; NP_001091014.1 2007 17460247 Genomic coordinates in CanFam3.1 provided by Zoe Shmidt and Robert Kuhn.

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2023). OMIA:001553-9615: 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.

2024 Wu, V., Swider, M., Sumaroka, A., Dufour, V.L., Vance, J.E., Aleman, T.S., Aguirre, G.D., Beltran, W.A., Cideciyan, A.V. :
Retinal response to light exposure in BEST1-mutant dogs evaluated with ultra-high resolution OCT. Vision Res 218:S0042-6989(24)00023-3:108379, 2024. Pubmed reference: 38460402. DOI: 10.1016/j.visres.2024.108379.
2023 Meadows, J.R.S., Kidd, J.M., Wang, G.D., Parker, H.G., Schall, P.Z., Bianchi, M., Christmas, M.J., Bougiouri, K., Buckley, R.M., Hitte, C., Nguyen, A.K., Wang, C., Jagannathan, V., Niskanen, J.E., Frantz, L.A.F., Arumilli, M., Hundi, S., Lindblad-Toh, K., Ginja, C., Agustina, K.K., André, C., Boyko, A.R., Davis, B.W., Drögemüller, M., Feng, X.Y., Gkagkavouzis, K., Iliopoulos, G., Harris, A.C., Hytönen, M.K., Kalthoff, D.C., Liu, Y.H., Lymberakis, P., Poulakakis, N., Pires, A.E., Racimo, F., Ramos-Almodovar, F., Savolainen, P., Venetsani, S., Tammen, I., Triantafyllidis, A., vonHoldt, B., Wayne, R.K., Larson, G., Nicholas, F.W., Lohi, H., Leeb, T., Zhang, Y.P., Ostrander, E.A. :
Genome sequencing of 2000 canids by the Dog10K consortium advances the understanding of demography, genome function and architecture. Genome Biol 24:187, 2023. Pubmed reference: 37582787. DOI: 10.1186/s13059-023-03023-7.
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.
2013 Guziewicz, K.E., Zangerl, B., Komáromy, A.M., Iwabe, S., Chiodo, V.A., Boye, S.L., Hauswirth, W.W., Beltran, W.A., Aguirre, G.D. :
Recombinant AAV-Mediated BEST1 Transfer to the Retinal Pigment Epithelium: Analysis of Serotype-Dependent Retinal Effects. PLoS One 8:e75666, 2013. Pubmed reference: 24143172. DOI: 10.1371/journal.pone.0075666.
2012 Guziewicz, K.E., Aguirre, G.D., Zangerl, B. :
Modeling the Structural Consequences of BEST1 Missense Mutations. Adv Exp Med Biol 723:611-8, 2012. Pubmed reference: 22183385. DOI: 10.1007/978-1-4614-0631-0_78.
Miyadera, K., Acland, G.M., Aguirre, G.D. :
Genetic and phenotypic variations of inherited retinal diseases in dogs: the power of within- and across-breed studies. Mamm Genome 23:40-61, 2012. Pubmed reference: 22065099. DOI: 10.1007/s00335-011-9361-3.
2011 Guziewicz, KE., Slavik, J., Lindauer, SJ., Aguirre, GD., Zangerl, B. :
Molecular Consequences of BEST1 Gene Mutations in Canine Multifocal Retinopathy Predict Functional Implications for Human Bestrophinopathies. Invest Ophthalmol Vis Sci 52:4497-505, 2011. Pubmed reference: 21498618. DOI: 10.1167/iovs.10-6385.
2007 Guziewicz, KE., Zangerl, B., Lindauer, SJ., Mullins, RF., Sandmeyer, LS., Grahn, BH., Stone, EM., Acland, GM., Aguirre, GD. :
Bestrophin gene mutations cause canine multifocal retinopathy: a novel animal model for best disease. Invest Ophthalmol Vis Sci 48:1959-67, 2007. Pubmed reference: 17460247. DOI: 10.1167/iovs.06-1374.
1998 Grahn, BH., Philibert, H., Cullen, CL., Houston, DM., Semple, HA., Schmutz, SM. :
Multifocal retinopathy of Great Pyrenees dogs. Vet Ophthalmol 1:211-221, 1998. Pubmed reference: 11397233.

Edit History

  • Created by Frank Nicholas on 04 Mar 2011
  • Changed by Vicki Meyers-Wallen on 28 Sep 2011
  • Changed by Frank Nicholas on 29 Sep 2011
  • Changed by Frank Nicholas on 12 Dec 2011
  • Changed by Imke Tammen2 on 16 Jun 2023