White spotting patterns that occur in many dog breeds do not have a uniform genetic basis, and the genetics are complex. In piebald/parti/random white spotting, the extent of white pattern expression varies, and markings are often asymmetrical.
Phenotype: The extent of white pattern expression on the dog's body varies in piebald/parti/random white spotting. The white markings are typically less symmetrical than those seen in dogs with the Irish spotting or mantle patterns.
Mode of Inheritance:Incomplete dominance (some breeds), Autosomal recessive (some breeds)
Alleles: N = Non-piebald, S = Piebald
Breeds appropriate for testing: Many breeds including Basset Hound, Border Collie, Bulldog, Cavalier King Charles Spaniel, Chihuahua, Chinese Shar-Pei, Cocker Spaniel (American and English), French Bulldog, German Shepherd, German Pointer (Longhaired, Shorthaired, and Wirehaired), Havanese, Newfoundland, Poodle, Portuguese Water Dog, Saint Bernard, Yorkshire Terrier, Whippet
Explanation of Results:
Dogs with N/N genotype do not have any copies of this piebald variant and thus are not expected to display piebald patterning (though they may have other white markings caused by other genes). They cannot transmit this piebald variant to any of their offspring.
Dogs with N/S genotype have one copy of this piebald variant. They may display no white patterning or some amount of white patterning (varies by breed). They may transmit this piebald variant to 50% of their offspring.
Dogs with S/S genotype have two copies of this piebald variant and are expected to display some amount of white patterning. White patterning may be extensive in some breeds, with some individuals being nearly completely white. They will transmit this piebald variant to all of their offspring.
$45 one test per animal
$65 two tests for coat color/fur type/bobtail (same animal) (excludes Cocoa)
$85 three tests for coat color/fur type/bobtail (same animal) (excludes Cocoa)
+ $15 each additional test if ordering more than three coat color/fur type/bobtail tests on the same animal (excludes Cocoa)
$115 per animal
Additional coat colors $15 per test (excludes Cocoa)
White spotting patterns that occur in many dog breeds do not have a uniform genetic basis. Some white patterns, such as the Irish spotting, are symmetrical with white markings on the undersides, collar and muzzle, and/or blaze such as seen in Boston Terriers and Corgis. The white pattern called mantle is phenotypically similar to Irish spotting but with more white extending onto the thigh and up the torso, as seen in some Great Danes. A pattern of less symmetrical white spotting, often called piebald, parti, or random white, is present in many breeds. A DNA variant has been found in Microphthalmia Associated Transcription Factor- (MITF) gene that is associated with piebald spotting in many breeds.
The genetic determination of white spotting in dogs is complex. In breeds such as Collie, Great Dane, Italian Greyhound, Shetland Sheepdog, Boxer and Bull Terrier, piebald behaves as a dosage-dependent trait. A dog with one copy of the MITF variant has some white pattern expression, while a dog with 2 copies of the variant display more extreme white with color only on the head and perhaps a body spot. In Boxers and Bull Terriers, dogs with 2 copies of the MITF variant are completely white and dogs with 1 copy display the mantle (called "flash" in these breeds) pattern. However, additional mutations in MITF or other white-spotting genes appear to be present in these breeds that affect the amount of white being expressed. In other breeds, piebald behaves as a recessive trait; that is, 2 copies of piebald are needed to produce white spotting.
Testing for piebald spotting assists breeders with selection of matings that can produce the desired outcome for white.
Note: expression of white patterns varies from breed to breed and among individuals within a breed. This test is specific for the mutation in MITF known to be associated with piebald/random white spotting.