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Breeds Affected: Old Danish Pointer

Samples Accepted: Blood, Buccal Swabs

Disease Information: CMS in the Old Danish Pointer can first be diagnosed around 4 months of age by their exercise intolerance: they can typically run for 5-30 minutes at a time, after which they are temporarily paralyzed.  The disease does not seem to increase in severity with age.

Inheritance Information: CMS is autosomal recessive, meaning that animals with two copies of this allele will be affected. Animals with one copy of the gene will be clinically-normal carriers.

The possible genotypes are:
N/N The dog is normal, and cannot produce affected offspring.
N/cms The dog is a carrier, and can pass the allele on to approximately 50% of any offspring. If bred to another N/cms carrier, approximately 25% of the offspring will be normal, 50% will be carriers, and 25% will be affected.
cms/cms The dog is affected. If bred to a normal animal, 100% of the offspring will be carriers. If bred to an N/cms carrier, 50% of the offspring will be carriers and 50% will be affected.

Recommendations:
– Carriers may be bred to normal animals (N/cms x N/N) without any risk of producing affected offspring. The offspring should be tested before breeding to determine if they are carriers or normal.
– Breeding two carriers (N/cms x N/cms) is not recommended due to the possibility of 25% of the offspring being affected.

– Affected animals should not be bred.

Test Information: This mutation test identifies a single base change in exon 6 of the CHAT gene.

Proschowsky, HF., Flagstad, A., Cirera, S., Joergensen, CB., Fredholm, M.: Identification of a mutation in the CHAT gene of Old Danish Pointing Dogs affected with congenital myasthenic syndrome. J Hered 98:539-43, 2007. Pubmed reference: 17586598. DOI: 10.1093/jhered/esm026.

Further information is available at the Online Mendelian Inheritance in Animals website.

Test #: D124

Cost: 35 € (excl. VAT)

Time: 7-10 days

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