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MDR1 Gene Varian / Ivermectin Sensitivity *
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Breeds
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American White Shepherd
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Australian Shepherd
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Bobtail
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Border collie
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Collie
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Elo
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English shepherd
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German Shepherd
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Longhaired Whippet
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McNab Shepherd (McNab Border Collie)
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Miniature American Shepherd
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Old English Sheepdog (Bobtail)
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Rough Collie
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Shetland Sheepdog (Sheltie)
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Silken Windhound
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Smooth Collie
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Waeller (Wäller)
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Kennel Club
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This test is part of the Official UK Kennel Club DNA Testing Scheme in Australian Shepherd , Border collie , Rough Collie , Shetland Sheepdog (Sheltie) , and Smooth Collie.
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The Disease |
MDR1 is a genetic disorder found in many dog breeds. Affected dogs, when treated with certain common drugs such as Ivermectin and loperamide (Imodium), are unable to pump out these drugs from the brain resulting in poisoning and neurologic symptoms ranging from tremors, anorexia and excess salivation to blindness, coma and even death. Some of these drugs such as Ivermectins, which vets prescribe extensively for the treatment of parasite infections, are able to cause toxicity at 1/200th of the dose required to cause toxicity in healthy dogs.
Scientists discovered that these dogs lack a protein (P-Glycoprotein), which is responsible for pumping out many drugs and toxins from the brain, and that affected dogs show signs of toxicity because they are unable to stop drugs from permeating their brains. Researchers have identified that this condition is due to a mutation in the multi-drug resistance gene [MDR1].
LIST OF DRUGS THAT CAUSE SENSITIVITY TO DOGS WITH MDR1 MUTATION
| Class A |
Do not use these drugs in dogs with MDR1 Gene Defect |
Ivermectine substances "Anti parasites": (Diapec®, Ecomectin®, Equimax®, Eqvalan®, Ivomec®, Noromectin®, Paramectin®, Qualimec®, Sumex®, Virbamec®)
Doramectine substances "Anti parasites": (Dectomax® )
Loperamide substances "ant diarrheal ":
(Imodium®)
Moxidectine substances "Anti Parasites" (Cydectin®, Equest®) |
Class B |
Use only under close control of veterinarian |
Cytostatics "Chemotherapy": (Vinblastine, Vincristine, Doxorubicine, Paclitaxel, Docetaxel, Methotrexat, Vincristine)
Immunosuppressive: (Cyclosporine A)
Heart glycosides: (Digoxine, Methyldigoxine)
Opioids: (Morphium)
Antiarrhythmics: (Verapamil, Diltiazem, Chinidine)
Antiemetics (Ondansetron, Domperidon, Metoclopramide )
Antibiotics (Sparfloxacin, Grepafloxacin, Erythromycin)
Antihistamin (Ebastin)
Glucocorticoid (Dexamethason)
Acepromazine (tranquilizer and pre-anesthetic agent) *
Butorphanol "analgesic and pre-anesthetic agent" *
Other drugs:
Etoposide, Mitoxantrone, Ondansetron, Paclitaxel, Rifampicin |
| Class C |
Can be used only in the permitted application form and dose! |
Selamectin (Stronghold®), Milbemax® and Advocate® . |
* In dogs with the MDR1 mutation, acepromazine and butorphanol tend to cause more profound and prolonged sedation in dogs . It is recommended to reduce the dose by 25% in dogs heterozygous for the MDR1 mutation (MDR1 / N) and by 30-50% in dogs homozygous for the MDR1 mutation (MDR1 / MDR1).
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Trait of Inheritance |
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Dogs that are homozygous for the mutation display, due to a non-functional transporter the ivermectin sensitive phenotype. They can show increased absorption of ivermectin and other substrates e.g. Digoxin, Vincristine, Doxorubicin, Cyclosporin A, Grepafloxacin, Dexamethasone and Loperamide (See list of drugs). Heterozygous animals (carriers) may show sensitivity to avermectins and other drugs. They are able to propagate the responsible mutation throughout the population and it is therefore important that carrier animals are detected prior to breeding.
Carriers mayhave sensitivity and should be treated with care
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Inheritance : AUTOSOMAL
trait
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Description |
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This is a mutation-based gene test, which offers many advantages over other methods
The MDR1 gene variant can be detected, using molecular genetic testing techniques. By DNA testing the mutation can be shown directly. The testing is carried out by state of the art laboratory methods and therefore provides a very high accuracy. In general DNA tests can be done at any age. These tests identify both affected and carrier animals. The mutation can be shown directly, what clearly identifies homozygous affected animals. The genetic test offers the unique possibility to identify Ivermectin sensitive animals prior to treatment with Ivermectin and other drugs (see list). * partner lab
Please note drug list may not be up to date. The WSU Veterinary CLinical Pharmacology Lab may have a more updated list https://vcpl.vetmed.wsu.edu/problem-drugs. Please note that there maybe other problem drugs which may have not been yet identified.
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Sample Requirements |
Whole blood in EDTA tube (0.5 - 1 ml) or Buccal swabs. . |
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Price
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£ 48.00 (including VAT)
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| To order:
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Download
Order Form from this link 
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Complete the order form and send it together
with your samples to the following address:
Laboklin (UK), 125 Northenden Road, Manchester, M33 3HF
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