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MDR1 Gene Defect / Ivermectin Sensitivity *

Test number: 8032

MDR1

Breeds
Australian Shepherd , Border collie , Collie , English shepherd , German Shepherd , Longhaired Whippet , McNab Shepherd (McNab Border Collie) , Old English Sheepdog (Bobtail) , Shetland Sheepdog (Sheltie) , Silken Windhound , Rough Collie , Smooth Collie , Bobtail , American White Shepherd , Waeller (Wäller) , Elo .
Kennel Club
This test is part of the Official UK Kennel Club DNA Testing Scheme in Australian Shepherd , Border collie , Shetland Sheepdog (Sheltie) , Rough Collie , and Smooth Collie.
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).

Trait of Inheritance
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.

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.

The dog will never develop MDR1 Gene Defect / Ivermectin Sensitivity * and therefore it can be bred to any other dog.

 

Carrier

Genotype: N / MDR1 [ Heterozygous ]

The dog carries one copy of the mutant gene and one copy of the normal gene.

The dog may develop MDR1 Gene Defect / Ivermectin Sensitivity.

Since it carries the mutant gene, it can pass it on to its offspring with the probability of 50%.

 

Affected

Genotype: MDR1 / MDR1 [ 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 will develop MDR1 Gene Defect / Ivermectin Sensitivity * and will pass the mutant gene to its entire offspring
Description

This is a mutation-based gene test, which offers many advantages over other methods

The MDR1 gene defect 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

 
Further reading
Canine MDR1 MutationAcrobat file
Sample Requirements
Whole blood in EDTA tube (0.5 - 1 ml) or Buccal Swabs.
Turnaround
2 - 3 weeks
Price
£ 48.00 (including VAT)

To order:

  • Download Order Form from this link pdf

  • Complete the order form and send it together with your samples to the following address:

    Laboklin (UK),   125 Northenden Road, Manchester, M33 3HF

See Also:
Copper Toxicosis (Copper Storage Disease )  
Progressive Retinal Atrophy (Dominant PRA)  
Globoid Cell Leukodystrophy (Krabbe Disease)  
CSNB (Congenital Stationary Night Blindness)  
CLAD (Canine Leukocyte Adhesion Deficiency)  
Cystinuria  
von Willebrand disease Type II (vWD II)  
PK Deficiency (Pyruvate Kinase Deficiency)  
Fucosidosis  
PFK Deficiency (Phosphofructokinase deficiency)  
Myotonia Congenita  
MH (Malignant Hyperthermia)  
X-Linked Severe Combined Immunodeficiency (X-SCID)  
GM1-Gangliosidosis  
Narcolepsy  
Muscular Dystrophy (MD)  
MPS ( Mucopolysaccharidosis type VII)  
Hereditary Myopathy / Centronuclear Myopathy (HMLR, CNM)  
Canine Cyclic Neutropenia (Gray Collie Syndrome)  
Progressive Retinal Atrophy (cord1- PRA)not recommended for diagnosis  
L-2-HGA ( L- 2 - hydroxyglutaric aciduria )  
von Willebrand disease Type I (vWD I)  
von Willebrand disease Type III (vWD III)  
Neuronal Ceroid Lipofuscinosis ( CL / NCL )  
Trapped Neutrophil Syndrome ( TNS )  
Progressive Retinal Atrophy (crd PRA)  
PDP 1 Deficiency (Pyruvate Dehydrogenase Phosphatase 1 Deficiency)  
Factor VII Deficiency  
Progressive Retinal Atrophy (rcd1 PRA)  
Progressive Retinal Atrophy (rcd3 PRA)  
Progressive Retinal Atrophy (rcd1a PRA)  
Exercise Induced Collapse ( EIC )  
Dwarfism (Pituitary Dwarfism / Hypopituitarism)  
Degenerative Myelopathy / Degenerative Radiculomyelopathy) DM (Exon 2)  
Greyhound Neuropathy (Hereditary Neuropathy)  
Brittle Bone Disease (Osteogenesis Imperfecta)  
Glycogen Storage Disease (GSDllla)  
Hereditary Cataract (HSF4)  
Neonatal encephalopathy (NE)  
Haemophilia B (factor IX deficiency)  
JEB (Junctional Epidermolysis bullosa)  
Primary Lens Luxation (PLL)  
Brachyury (Bobtail Gene / Short Tail)  
Familial Nephropathy (FN) / Hereditary Nephropathy *  
Startle Disease (SD) / Hyperekplexia  
Familial Nephropathy (FN) / Hereditary Nephropathy  
Myostatin Mutation ("Bully" Whippet)/ Double Muscling  
Hereditary Nephritis / Samoyed Hereditary Glomerulopathy  
Episodic Falling in Cavalier King Charles Spaniel (EF)  
Dry Eye and Curly Coat syndrome (CCS)  
Episodic Falling + Dry Eye Curly Coat syndrome  
Haemophilia A (factor VIII deficiency)  
Congenital Hypothyreosis / hypothyroidism (CHG)  
Hereditary Nasal Parakeratosis (HNPK)  
Juvenile Epilepsy (JE)  
Musladin-Lueke syndrome (MLS)  
Ichthyosis *  
Neonatal Cortical Cerebellar Abiotrophy (NCCD)  
Dwarfism (Skeletal Dysplasia 2)  
Primary Open Angle Glaucoma (POAG)  
Progressive Retinal Atrophy (generalized PRA)  
Progressive Retinal Atrophy (GR-PRA1)  
Progressive retinal atrophy ( rcd4-PRA) / LOPRA  
Alaskan Malamute Polyneuropathy (AMPN / IPAM / HPAM)  
Pug Dog Encephalitis (PDE) / Necrotizing Meningoencephalitis (NME)  
Polycystic Kidney Disease (PKD)  
Pompe's Disease (Glycogen Storage Disease type II / GSDII)  
Primary ciliary dyskinesia (PCD)  
Protein Losing Nephropathy (PLN)  
Late Onset Ataxia (LOA)  
Cobalamin Malabsorption (Imerslund-Gräsbeck syndrome (IGS))  
Collie Eye Anomaly (CEA) / Choroidal Hypoplasia (CH) Option 2 Optigen*  
Retinal Dysplasia (RD) / Oculo Skeletal Dysplasia (OSD)*  
Spinocerebellar ataxia (SCA)  
Cystinuria (Labrador Cystinuria)  
Cystinuria (Dominant)  
pap-PRA1 (Progressive Retinal Atrophy)  
Progressive Retinal Atrophy (BAS PRA)  
CMSD (Canine Multiple System Degeneration)  
Hereditary Cataract (HSF4) *  
Special offer 4: Juvenile Epilepsy + Furnishing + LSD  
Progressive Retinal Atrophy (prcd-PRA) Option 2: Optigen (8094X)  
Progressive Retinal Atrophy (prcd-PRA) Option 1: (8094P)  
Thrombopathia (Thrombopathy)  
Digital Hyperkeratosis (DH) (Hereditary Footpad Hyperkeratosis / Corny Feet)  
Degenerative Myelopathy / degenerative radiculomyelopathy) DM (Exon 1)  
Degenerative Myelopathy / degenerative radiculomyelopathy) DM (Exon 1 + Exon 2)  
Ectodermal Dysplasia / Skin Fragility Syndrome (ED / SFS)  
Hypomyelination (Shaking Puppy Syndrome) SPS  
XL - PRA * (Optigen)  
Type A PRA * Optigen)  
Late Onset Ataxia (LOA) + Spinocerebellar Attaxia (SCA)  
Late Onset Ataxia (LOA) + Spinocerebellar Attaxia (SCA) + PLL  
Leonberger Polyneuropathy 1 ( LPN1)  
Adult Onset Neuropathy * (AON)  
Hereditary Ataxia (HA)  
Finnish Hound Ataxia / Cerebellar Ataxia (FHA / CAFH)  
Dandy-Walker-Like Malformation (DWLM)  
Persistent Müllerian duct syndrome (PMDS)  
Cone Degeneration (CD) by OptiGen *  
Fanconi Syndrome (FS) *  
Lagotto Storage Disease (LSD)  
Juvenile Laryngeal Paralysis & Polyneuropathy (JLPP)  
Progressive Retinal Atrophy (CNGA1 PRA)  
Achromatopsia (day blindness)  
Progressive Retinal Atrophy (GR-PRA2)  
Special Offer: prcd PRA * (8094P) + GR-PRA1 + GR-PRA2  
Unspecified test  
Postoperative Hemorrhage (P2Y12 / P2RY12)  
Glanzmann Thrombasthenia (Thrombasthenia, Thrombasthenic thrombopathia, GT)  
Prekallikrein Deficiency (KTK) / Fletcher Factor Deficiency  
C3 Deficiency (Complement Component 3 deficiency)  
Congenital Myasthenic Syndrome (CMS)  
Bardet Biedl Syndrome (BBS)  
GM2 Gangliosidosis Variant 0 (Sandhoff Disease)  
Macrothrombocytopenia ( MTC-D )  
Renal Cystadenocarcinoma and Nodular Dermatofibrosis (RCND)  
Vitamin D-dependent Rickets (HVDRR)  
Amelogenesis Imperfecta (AI) / Familial Enamel Hypoplasia (FEH)  
X-linked Myotubular Myopathy (XLMTM)  
Collie Eye Anomaly (CEA) / Choroidal Hypoplasia (CH) Option 1*  
Macrothrombocytopenia ( MTC- R )  
Muscular Dystrophy (MDL)  
Mucopolysaccharidosis type IIIa (MPS IIIA)  
Neuroaxonal Dystrophy ( NAD )  
Progressive Retinal Atrophy (rcd2-PRA) Option 1 by Laboklin  
Ichthyosis ( Epidermolytic Hyperkeratosis (EHK) )  
May-Hegglin Anomaly (MHA)  
Alaskan Husky Encephalopathy (AHE)  
Cerebral Dysfunction (CDF)  
Dwarfism ( Chondrodysplasia )  
Ichthyosis (Congenital Ichthyosis / Great Dane Ichthyosis)  
Hemorrhagic Diathesis / Bleeding Diathesis (Canine Scott Syndrom)  
Special Offer: Ichthyosis + GR-PRA1 + GR-PRA2  
Glycogen storage disease type Ia (GSD Ia) / VON Grieke Disease  
Gallbladder Mucoceles  
Primary Hyperoxaluria type I (PH I)  
Hyperuricosuria / Urate Stones (HUU, SLC)  
Severe Combined Immunodeficiency (SCID)  
Leukocyte Adhesion Deficiency type III (LAD III)  
Cleft Lip / Palate and Syndactyly (CLPS)  
Progressive Retinal Atrophy (crd1 PRA)  
Progressive Retinal Atrophy (CRD2 PRA)  
Spondylocostal Dysostosis (Comma Defect)  
Canine Multi-Focal Retinopathy (CMR)  
Craniomandibular Osteopathy (CMO)  
Retinal Dysplasia (RD) / Oculo Skeletal Dysplasia (OSD)*  
Special Offer: DM (Exon 2) + MDR1  
Special Offer Chinese Crested: PLL + prcd PRA Option 1 + rcd3 PRA + DM Exon 2  
Warbung Micro Syndrome 1 (WARBM1)  
Raine Syndrome  
van den Ende-Gupta Syndrom (VDEGS)  

 
 
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