Coat colour OCA1 / Himalayan (TYR-related) - Dachshund

What does this test analyse?

This DNA test analyses the TYR variant c.230G>A that causes the OCA1 / Himalayan pigment pattern in the Dachshund. The trait is also known as Himalayan coat colour, acromelanism, oculocutaneous albinism type I, OCA1 and TYR-related pigment dilution.

What does Himalayan/OCA1 mean?

TYR plays a key role in melanin pigment production. In the Himalayan/acromelanism pattern, pigment production is temperature-sensitive: the body can be very light to almost white, while cooler areas such as ears, muzzle, feet or tail can become darker. In young puppies the pattern can be subtle and become clearer with age.

Dogs with two copies can also have a pale nose and blue or lighter eyes. The final visible colour still depends on base colour and other coat-colour genes.

Inheritance and result

The trait is inherited as autosomal recessive. A dog with one copy is a carrier and normally does not show the Himalayan/OCA1 pattern. A dog with two copies develops the corresponding pigment pattern and passes the variant to all offspring.

Practical value

• Breeders can identify carriers before planning matings.
• The result helps explain why a Dachshund has an unusually light or Himalayan-like coat.
• The test supports colour planning and targeted breeding selection without unexpected recessive pigment outcomes.
• In lightly pigmented dogs, the result helps interpret eye colour, nose pigmentation and possible light sensitivity.