EM (MC1R) Locus - Melanistic Mask

Test Overview:

The Em variant of the MC1R gene at the extension (E/e) Locus results in the localized distribution of eumelanin (black pigment) on the muzzle of the dog which resembles a dark "mask" on dogs with lighter colored coats. Although the Em variant produces a black melanistic mask, the final color of a dog's mask is dependent on other DNA variants such as the B and D loci that modify the production or appearance of the eumelanin (black pigment) in the dog. For example, dogs that are b/b at the B locus will have brown masks due to the disruption of eumelanin synthesis that results in the conversion of black pigmented areas to brown.


Trait (Associated with Phenotype)



Variant Detected:

Base Substitution G>A


It is a trait and so is tested based on preference, not usually for health concerns.

Mode of Inheritance:

Autosomal Recessive

Research Citation(s):

"Conditions Associated with Coat Color in Dogs." University of Saskatchewan. University of Saskatchewan, 02 June 2011. Web. 03 Apr. 2014. .
Dog Coat Colour Genetics
J Hered. 2003 Jan-Feb; 94(1):69-73. [PubMed: 12692165]
Animal Genetics. 2000 Jun; 31(3):194-99. [PubMed: 10895310]

Associated Breed(s):

Affenpinscher, Afghan Hound, Airedale Terrier, Akita , Alaskan Malamute, All Breeds (Canine), American Bulldog , American Cocker Spaniel, American Eskimo Dog, American Foxhound, American Staffordshire Terrier, Anatolian Shepherd, Australian Bulldog, Australian Cattle Dog, Australian Cobberdog, Australian Kelpie, Australian Shepherd, Australian Silky Terrier, Australian Stumpy Tail Cattle Dog, Australian Terrier, Basenji, Basset Hound, Beagle, Bearded Collie , Bedlington Terrier, Belgian Groenendael Shepherd, Belgian Lakenois Shepherd, Belgian Malinois Shepherd, Belgian Tervueren Shepherd , Bernese Mountain Dog, Bichon Frise, Black Russian Terrier , Bloodhound, Boerboel, Border Collie, Border Terrier, Borzoi, Boston Bulldog, Boston Terrier, Bouvier Des Flandres, Boxer , Boykin Spaniel, Briard, British Bulldog, Brittany Spaniel , Bull Arab, Bull Terrier, Bullmastiff, Cairn Terrier, Canaan Dog, Cane Corso Italiano, Cardigan Welsh Corgi, Cardigan Welsh Corgi, Catahoula, Catahoula Leopard Dog, Cavalier King Charles Spaniel, Cavoodle, Chesapeake Bay Retriever , Chihuahua, Chinese Crested, Chow Chow, Clumber Spaniel , Cockapoo, Cocker Spaniel, Collie Rough, Collie Smooth, Coonhound, Coton De Tulear, Curly Coated Retriever, Dachshund , Dachshund Standard Long Hair, Dachshund Standard Smooth Hair, Dachshund Standard Wire Hair, Dalmatian, Dandie Dinmont Terrier, Dingo, Dobermann, Dogue de Bordeaux, English Setter , English Springer Spaniel, English Toy Spaniel , English Toy Terrier, Field Spaniel, Finnish Lapphund, Flat Coated Retriever, Fox Terrier (Toy), Foxhound , French Bulldog, German Shepherd Dog, German Shorthaired Pointer, German Spitz , Giant Schnauzer, Golden Retriever, Goldendoodle, Gordon Setter , Great Dane, Great Pyrenees, Greyhound , Griffon Bruxellois - Standard, Groodle, Harlequin Pinscher, Havanese, Havanese Terrier Toy, Hungarian Kuvasz, Hungarian Vizsla, Ibizan Hound, Irish Setter, Irish Terrier, Irish Wolfhound, Italian Greyhound, Italian Spinone, Jack Russell Terrier, Jagd Terrier, Japanese Chin, Japanese Shiba Inu, Japanese Spitz, Keeshond, Kerry Blue Terrier, Komondor, Koolie , Labradoodle , Labrador Retriever, Lagotto Romagnolo, Lakeland Terrier , Lancashire Heeler, Landseer ECT, Lapponian Herder, Leonberger, Lhasa Apso, Lowchen, Maltese, Manchester Terrier , Maremma Sheepdog, Mastiff , Miki, Miniature American Shepherd, Miniature Bull Terrier, Miniature Dachshund Long Hair, Miniature Dachshund Smooth Hair, Miniature Dachshund Wire Hair, Miniature Fox Terrier, Miniature Pinscher , Miniature Poodle, Miniature Schnauzer, Miniature Yorkshire Terrier, Mixed Breed, Mountain Dog , Munsterlander, Murray River Retriever, Neapolitan Mastiff, Newfoundland, Norfolk Terrier , Norwegian Elkhound, Norwich Terrier, Nova Scotia Duck Tolling Retriever , Old English Mastiff , Old English Sheepdog , Papillon, Parson Russell Terrier, Pekingese, Pembroke Welsh Corgi, Peruvian Hairless Dog, Plott Hound, Pomeranian, Portuguese Water Dog, Pug, Puli, Rat Terrier, Rhodesian Ridgeback , Rottweiler , Saint Bernard , Saluki, Samoyed, Schipperke, Schnoodle, Scottish Deerhound, Scottish Terrier , Sealydale Terrier, Sealyham Terrier , Shar Pei, Shetland Sheepdog, Shiba Inu, Shih tzu, Siberian Husky, Silky Terrier , Skye Terrier, Sloughi, Smithfield, Smooth Fox Terrier, Soft Coated Wheaten Terrier, Spoodle, Staffordshire Bull Terrier , Standard Poodle, Standard Schnauzer, Sussex Spaniel, Swedish Lapphund, Tenterfield Terrier , Tibetan Mastiff, Tibetan Spaniel, Tibetan Terrier , Toy Poodle, Volpino Italiano, Water Spaniel , Weimaraner, Welsh Springer Spaniel, West Highland White Terrier , Whippet , White Swiss Shepherd, Wire Fox Terrier, Xoloitzcuintle (Mexican Hairless), Yorkshire Terrier,