Update from BC Genetic Research sub committee 30.09.06 Click Here
1. L-2-HGA Hydroxyglutaric Aciduria
In the past few years a small number of Staffords have been diagnosed with a metabolic disorder, its clinical name is L2 hydroxyglutaric aciduria or L-2-HGA. This condition manifests itself in varied ways with affected dogs displaying behavioural changes and dementia, anxiety attacks, having full blown seizures, as well as exercise intolerance and ataxia (unsteady gait), tremors and muscular stiffness. Dogs from totally different bloodlines have been found to be sufferers and the number of affected dogs diagnosed has risen. The disorder (and a similar linked disorder D-2 HGA) is found in humans, again very rare, but nevertheless devastating for those families affected by it. The disorder has an autosomal recessive method of inheritance, which means that both parents must be carriers of the affected gene to produce affected offspring.
Through excessive hard work not only on behalf of the Animal Health Trust at Newmarket and by people submitting blood and urine samples from the families of affected animals a genetic test has been determined to identify the carriers of the gene which causes L-2-HGA.
IT IS THEREFORE ADVISABLE THAT ALL BREEDING STOCK BE SCREENED IN ORDER TO ERADICATE THIS CONDITION IN THE FUTURE.
This can be done by submitting a blood sample to the AHT at Newmarket. For instructions on sample collection please download request for DNA testing form HERE
TESTING CAN TAKE UP TO 6 WEEKS FOR RESULTS SO PLEASE MAKE SURE YOU HAVE THIS DONE IN PLENTY OF TIME BEFORE YOUR PLANNED MATING.
2. HC – HEREDITARY CATARACTS.
It is known that HC is inherited by and automal recessive path (i.e. both parents must be carriers of the defective gene to produce and affected offspring). HC is a progressive condition and this means that although a puppy is not born with cataracts they will start to develop at a juvenile age. (maybe from 8 months onwards), and will progress until the dog is totally blind. This condition is bilateral which means is affects both eyes equally. Thanks to the tireless research by the Animal Health Trust in Newmarket there is a now a DNA Test for Hereditary Cataracts.
For instructions on sample collection please download request for DNA testing form HERE
3. PHPV – PERSITENT HYPERPLASTIC PRIMARY VITREOUS
The mode of inheritance of PHPV is not so clear, but it is known that it is a congenital condition (present at birth) and that it is not progressive. This means that if a puppy is born with PHPV it can be detected by ophthalmic screening from 6 weeks of age and if it is affected, whatever the condition of the problem at that stage it will not change throughout the dogs life.
Either of the above conditions can be operated on, but it is a serious operation and can be traumatic and very expensive. It is not always covered by insurance due to the hereditary nature.
Even though the genetic test is now available for Hereditary Cataracts it is still important to screen for PHPV.
4. PPSC – POSTERIOR POLAR SUBCAPSULAR CATARACT.
This type of cataracts is found in other breeds, particularly the Labrador and Golden Retriever.
It usually remains as a small, punctuate cataract and doesn’t usually lead to sight problems in these two breeds. It has been placed on schedule 3 of the BVA/KC/ISDS Eye Scheme because a number of Staffords that have been through the Scheme have been found to have this type of cataract. This type of cataract cannot be detected through litter screening. The mode of inheritance is unknown and has a variable age of onset. BREEDING STOCK SHOULD BE TESTED ANNUALLY TO DETERMINE THAT THE DOG IS CERTIFIED CLEAR AT THE TIME OF MATING. Eye Testing Clinics
COST OF TESTING. BOTH THE TEST FOR L2HGA AND HC ARE £67 EACH, HOWEVER IF YOU HAVE THE TWO TESTS DONE TOGETHER THIS WILL BE £112, PLEASE CLICK HERE FOR INSTRUCTIONS. THE AHT WILL SEND YOU THE SWABS FOR THE HC TEST UPON REQUEST, FREE OF CHARGE,
BOTH THE TEST FOR L2HGA AND HC ARE £67 EACH, HOWEVER IF YOU HAVE THE TWO TESTS DONE TOGETHER THIS WILL BE £112, PLEASE CLICK HERE FOR INSTRUCTIONS. THE AHT WILL SEND YOU THE SWABS FOR THE HC TEST UPON REQUEST, FREE OF CHARGE,