Background
crd3 is one of several cone rod dystrophies that have been recognized in multiple breeds of dogs. All forms of CRD are characterized by the initial loss of cones, the cells in the retina that are responsible for vision in bright light/daylight, followed by the degeneration of rods, the retinal cells that operate during night vision. Unlike another recently identified cone rod dystrophy, crd2, that causes blindness in American Pit Bull Terrier pups by one year of age, crd3 is typically a late-onset disease. Clinical symptoms of crd3 are usually not evident until adulthood has been reached.
Test specific information
This test is performed by OPTIGEN.
Age
The disease may show itself on different ages, in which it cannot be estimated when the first symptoms may show themselves. Differences may exist between littermates, and between breeds.
Throughput
Normally the result can be expected within 25 working days. This turn-around-time starts when both the sample and the fully filled-out and signed submission form have been received.
Location of disease or trait
This disease mainly affects vision, and may result in blindness.
Breed dependence
This DNA test is available for the following breeds: Glen of Imaal Terrier.
Sample type
For this DNA test we accept the following materials: Blood EDTA, Blood Heparin, Tissue, Swab, Semen. Please contact PharmaDNA if you wish to submit other material as listed.
Result
An animal can be free and has in that situation two healthy alleles. When used in breeding this animal will not become ill due to the disease. It cannot spread the disease in the population.An animal can be carrier and has in that situation one healthy and one disease allele. When used in breeding 50 percent of the offspring will receive the disease allele. Carriers will not become ill.An animal can be affected and has in that situation two disease alleles. When used in breeding all offspring will also receive the disease allele. Affected will become ill.
Inheritance
This genetic factor is inherited in an autosomal, recessive, mode. This means, that the individual can be free of the disease (homozygote normal), affected (homozygous affected) or carrier (heterozygous). Carriers may spread the mutation in a population without showing symptoms themselves. Because of this, it is extremely important to identify carriers correctly to prevent spreading of a mutation.
Severity of Disease
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