Color Modification
Chocolate (basd)
Alternative Names: Brown, Liver, Chestnut, Red
Chocolate color discovered in the Australian Shepherd, also known as "basd," is a variant found in the TYRP1 gene, known as the B locus. This variant is associated with a dog’s darkest color pigment being limited to brown instead of black. Meaning all dark hair, nails and skin (including eye rims, nose and paw pads) will be a shade of brown or chocolate. It was previously reported as Chocolate (Variant 4).
Breeds
Chocolate (basd) is common in:
Australian Shepherd
More Info
Did you know?
Chocolate dogs are unable to produce black pigment, so even their freckles are chocolate, and their eye color is usually gold or amber.
How it works
To show chocolate coloration a dog must inherit two chocolate variants, one from each parent. This can either be two copies of a particular variant, such as this one ("basd”), or two of any combination of chocolate variants. This variant is rare and is most commonly seen in the Australian Shepherd Dog.
Prevalence
1 in 1,300 dogs
has one or more copy of this genetic variant in our testing.
Technical Details
| Gene | TYRP1 |
|---|---|
| Also Called | Brown (B) Locus |
| Variant | T>G |
| Chromosome | 11 |
| Coordinate | 33,319,349 |
All coordinates reference CanFam3.1
References & Credit
Credit to our scientific colleagues:
Hrckova Turnova, E., Majchrakova, Z., Bielikova, M., Soltys, K., Turna, J., & Dudas, A. (2017). A novel mutation in the TYRP1 gene associated with brown coat colour in the Australian Shepherd Dog Breed. Animal Genetics, 48(5), 626. View the article