Search Term: Multidrug Resistance 1 (MDR1)
Breeds
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Relevance Rating: There is moderate evidence or research available for these breeds
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Relevance Rating: The test is unknown, there is no evidence (i.e. research) available, or it has not been evaluated yet. These tests may or may not be meaningful for these breeds
Disease Name
Multidrug Resistance 1 (MDR1)
Disease Name 2
MDR1
OMIA
1402
Gene Name
ABCB1
Gene Name 2
CanFam 3.1, Chr. 14
Mutation
c.296_299del4
Mutation 2
c.295_298del
Mutation 3
g.13726596_13726599del
Mutation 4
c.228_231del
OMIM
171050
Disease Code
MDR1
Test Type
Diagnostic Tool
Details
Multi-Drug Resistance Gene, (MDR) codes for a protein that is responsible for protecting the brain by transporting potentially harmful chemicals away from the brain. In certain breeds, a mutation in the MDR1 gene causes sensitivity to Ivermectin, Loperamide, and a number of other drugs. As a result of the accumulation of toxins, the dog can show neurological symptoms including: ataxia, tremors, seizures, excessive salivation, obtundation, bradycardia, mydriasis, loss of menace, loss of papillary light responses, coma and respiratory arrest. Age of onset from birth, but symptoms only noted when exposed to drugs causing sensitivity.There are many different types of drugs that have been reported to cause problems. Some drugs include: Acepromazine, Butorphanol, Cyclosporin, Digoxin, Doxorubicin, Doramectin, Emodepside, Erythromycin, Ivermectin, Loperamide (Imodium), Milbemycin, Moxidectin, Paclitaxel, Rifampin, Selamectin, Vinblastine, Vincristine. Please note this list is not exhaustive and could be subject to change.
Details 2
Multidrug resistance 1 is caused by a lack of P-glycoprotein drug transporter in the blood-brain barrier, which is characterized by neurotoxicity after administration of certain drugs. A genetic test is available. Neurotoxicity following drug administration, which varies according to dose, is the main sign. Dogs may show ataxia, tremors, seizures, excessive salivation, obtundation, bradycardia, mydriasis, loss of menace, loss of papillary light responses, coma and respiratory arrest (Mealey et al., 2001). P-gp normally transports some chemotherapeutic agents (Vinca alkaloids, doxorubicin), immunosuppressants (cyclosporine, tacrolimus), macrocyclic lactone antiparasitic drugs (ivermectin, loperamide, milbemycin, selamectin, moxidectin), HIV-1 protease inhibitors, and steroid hormones. (From OMIA)
Patents/ Licences
Washington State University owns Patent on MDR1 genotyping: US 6790621. Wisdom Health is the only entity licensed to perform MDR1 genotyping in conjunction with breed analysis and genetic screening for multiple diseases and traits in the United States
Application Information
Published
Mealey, KL., Bentjen, SA., Gay, JM., Cantor, GH. : Ivermectin sensitivity in collies is associated with a deletion mutation of the mdr1 gene. Pharmacogenetics 11:727-33, 2001. Pubmed reference: 11692082.
Published 2
Mizukami, K., Yabuki, A., Kohyama, M., Kushida, K., Rahman, M.M., Uddin, M.M., Sawa, M., Yamato, O. : Molecular prevalence of multiple genetic disorders in Border collies in Japan and recommendations for genetic counselling. Vet J 214:21-3, 2016. Pubmed reference: 27387721. DOI: 10.1016/j.tvjl.2016.05.004.
Published 3
Donner J, Kaukonen M, Anderson H, Moller F, Kyostila K, Sankari S, Hytonen M, Giger U, Lohi H. Genetic Panel Screening of Nearly 100 Mutations Reveals New Insights into the Breed Distribution of Risk Variants for Canine Hereditary Disorders. PLoS One. 2016 Aug 15;11(8):e0161005. [PubMed: 27525650]
Published 4
Gramer, I., Leidolf, R., Doring, B., Klintzsch, S., Kramer, EM., Yalcin, E., Petzinger, E., Geyer, J. : Breed distribution of the nt230(del4) MDR1 mutation in dogs. Vet J 189:67-71, 2011. Pubmed reference: 20655253. DOI: 10.1016/j.tvjl.2010.06.012.
Body/System/Process
Blood
OMIA Url
Inheritance
AR
Gene Name Text
ATP-binding cassette, sub-family B (MDR/TAP), member 1
Phene Discovery
The discovery of the MDR1 mutation in dogs, establishment of genotyping procedures, development of all reagents, and research into specific problem drugs was made or conducted by Washington State University.
Researched Breeds
Border Collie, Australian Shepherd, Collie, German Shepherd Dog, Longhaired Whippet, Miniature Australian Shepherd, Old English Sheepdog, Shetland Sheepdog, Silken Windhound, Waller, White Swiss Shepherd
GTPs
La Tour de Salvagny, N/A
FR
FR
Antagene
HGTD Leadership Sponsor Test Discovery- GTP In House Testing ISO Accredited/ GTP ISO Accredited/LAB Non-Participant Out Sourced Testing Any Patents Held
Toronto, Ontario
CA
CA
Boston, MA
US
US
Embark
HGTD Leadership Sponsor Test Discovery- GTP In House Testing ISO Accredited/LAB Out Sourced Testing Any Patents Held Sponsor
Maribor
SI
SI
EVG Diagnostics
In House Testing ISO Accredited/ GTP Non-Participant Other Recognized Accreditation Out Sourced Testing
Plzen
CZ
CZ
Genomia s.r.o
HGTD Leadership Sponsor In House Testing ISO Accredited/ GTP ISO Accredited/LAB ISO Accredited/tests Participation Pending
Bad Kissingen, Bavaria
DE
DE
Laboklin Gmbh & Co. KG
HGTD Leadership Sponsor Test Discovery- GTP In House Testing ISO Accredited/ GTP ISO Accredited/LAB ISO Accredited/tests Other Recognized Accreditation Out Sourced Testing Participation Pending Any Patents Held Supporter
St. Kilda, Victoria
AU
AU
Spokane, Washington
US
US
Paw Print Genetics
HGTD Leadership Sponsor Test Discovery- GTP In House Testing Non-Participant Other Recognized Accreditation Subsidiary Company
London, Borough of London
GB
GB
Pullman, WA
US
US
Veterinary Clinical Pharmacology Laboratory (VCPL)
Academic Participant Test Discovery- GTP In House Testing Any Patents Held
Wageningen
NL
NL
VHL Genetics
HGTD Leadership Sponsor Test Discovery- GTP In House Testing ISO Accredited/ GTP ISO Accredited/LAB Out Sourced Testing Supporter
Vancouver, Washington
US
US
Wisdom Panel - Kinship
HGTD Leadership Sponsor Test Discovery- GTP Other Recognized Accreditation Out Sourced Testing Participation Pending Sponsor
Zagreb
HR
HR