|
Progressive Retinal Atrophy (rcd2-PRA) by Laboklin
Test number: 8309
Gene: PRA
Price: £ 48.00 (including VAT)
|
|
|
|
|
|
Breeds
|
|
Collie
,
Rough Collie
,
Smooth Collie
.
|
|
|
|
Kennel Club
|
|
This test is part of the Official UK Kennel Club DNA Testing Scheme in Rough Collie.
for UK registered dogs, Laboklin can send results of the tests which are part of the Official UK Kennel Club DNA testing scheme to the Kennel Club (KC) to be recorded and published
as part of the Kennel Club scheme. Results will only be recorded and published by the KC if the result report includes the dog’s
microchip or tattoo number along with either the dog’s registered name or registered number. Any test results that do not carry these identifying
features will not be recorded by the Kennel Club.
In order to ensure that test results are sent to the Kennel Club, customers must also sign the declaration section on the order form to give Laboklin permission to do so.
important:
When you sign the declaration, Laboklin will send the results to the KC on your behalf, and you do not need to send them to the KC yourself again to avoid unnecessary duplications.
|
|
|
|
The Disease |
Progressive retinal atrophy (PRA) is a leading hereditary cause of blindness in pedigree dogs as is its counterpart retinitis pigmentosa (RP) in humans. PRA shows genetic heterogeneity, as does RP, with several distinct forms already recognized and several more remaining to be investigated.
The retina is a thin layer of neural cells that lines the back of the eyeball. The vertebrate retina contains photoreceptor cells (rods and cones) that respond to light. The cones mediate high-resolution vision and colour vision. The rods mediate lower-resolution, black-and-white, night vision. The degeneration of the retina results in loss of vision, often leading to blindness. One can distinguish between late onset forms of PRA and early onset (whelp-age) dysplastic changes. The clinical and ophthalmologic signs of both forms are similar.
Affected dogs suffer from bilateral Mydriasis, the reflection of the Tapetum lucidum is increased and the retinal vascular network appears atrophic. Currently, there is no treatment for the disease.
Collie:
The “Collie-PRA”, also termed rod-cone dysplasia type 2 (rcd 2), is one form of progressive retina degeneration which is known for a long time as major health problem in the collie breed.
An abnormal development of the cones and rods of the retina leads to night blindness with early onset. First symptoms appear around whelp-age of about 6 weeks. In the majority of cases, a complete loss of vision occur by the age of 1 in rcd2-affected dogs. |
|
|
|
|
Trait of Inheritance |
|
.
|
Inheritance : AUTOSOMAL
RECESSIVE
trait
Sire
|
|
Dam
|
|
Offspring
|
| |
|
|
|
|
|
clear
|
 |
clear
|
 |
100% clear
|
| |
|
|
|
|
|
clear
|
|
carrier
|
|
50% clear + 50%
carriers
|
| |
|
|
|
|
|
clear
|
|
affected
|
|
100% carriers
|
| |
|
|
|
|
|
carrier
|
|
clear
|
|
50% clear + 50%
carriers
|
| |
|
|
|
|
|
carrier
|
|
carrier
|
|
25% clear + 25% affected
+ 50% carriers
|
| |
|
|
|
|
|
carrier
|
|
affected
|
|
50% carriers + 50%
affected
|
| |
|
|
|
|
|
affected
|
|
clear
|
|
100% carriers
|
| |
|
|
|
|
|
affected
|
|
carrier
|
|
50% carriers + 50%
affected
|
| |
|
|
|
|
|
affected
|
|
affected
|
|
100% affected
|
Clear
Genotype: N / N [ Homozygous normal ]
The dog is noncarrier of the mutant gene.
It is very unlikely that the dog will develop Progressive Retinal Atrophy (rcd2-PRA) by Laboklin. The dog will never pass the mutation to its offspring, and therefore it can be bred to any other dog.
Carrier
Genotype: N / PRA [ Heterozygous ]
The dog carries one copy of the mutant gene and one
copy of the normal gene.
It is very unlikely that the dog will develop Progressive Retinal Atrophy (rcd2-PRA) by Laboklin but since it carries the mutant gene, it can pass it on to its offspring with the probability of 50%. Carriers should only be bred to clear dogs. Avoid breeding carrier to carrier because 25% of their offspring is expected to be affected (see table above)
Affected
Genotype: PRA / PRA [ Homozygous mutant ]
The dog carries two copies of the mutant gene and
therefore it will pass the mutant gene to its entire offspring.
The dog is likely to develop Progressive Retinal Atrophy (rcd2-PRA) by Laboklin and will pass the mutant gene to its entire offspring
|
|
|
| |
| |
|
Price
|
|
£ 48.00 (including VAT)
|
|
|
 |
|
|
|
|
