Glossary

Screening Scheme Description

DNA test - MDR1
Multiple Drug Sensitivity

Details about the disease

MDR1 is an inherited condition that makes affected dogs particularly sensitive to drugs like ivermectin (anti-parasitic) and loperamide (opioid to treat diarrhoea). In normal dogs the blood/brain barrier protects the brain cells from various drugs and toxins. P-glycoprotein is a protein which physically pumps drugs and toxins from the cerebrospinal fluid (serum-like fluid that circulates through the brain ventricles and spinal cord cavity) back into the blood circulation. The MDR-1 mutation results in an inactive P-glycoprotein which means that drugs and toxins can accumulate in the cerebrospinal fluid and begin to inhibit brain activity.

Clinical signs

The result is that exposure of affected dogs to such drugs may be an illness requiring an extended hospital stay - or even death.

How it is inherited

The disease is described as an autosomal recessive condition. This means that a dog must inherit two copies of an abnormal gene (one from its mother and one from its father) before its health is affected. A dog that inherits only one copy of the abnormal gene (from its mother or its father) will have no signs of the disease, but will be a carrier and may pass the gene on to any offspring.

Which laboratories test for this condition?

A list of laboratories and DNA tests can be found at the following link http://www.thekennelclub.org.uk/health/for-breeders/dna-testing-simple-inherited-disorders/worldwide-dna-tests/

How to responsibly breed from your DNA tested dog

If, once your dog is DNA tested, you would like to find out what their DNA test results mean, or how to select the right mate to avoid producing affected puppies, then please read our breeding advice and information on the following link http://bit.ly/2oSbtnn.

How to find out if a potential mate has been DNA tested

The Kennel Club’s “Health Test Results Finder” allows you to find the results of DNA tests carried out as part of official Kennel Club DNA testing schemes for any dog on the Kennel Club’s breed register. To access this free health tool, please follow this link http://bit.ly/1jyCFnc.

 

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