Copper toxicosis modifier / protective ATP7A (ATP7A-related) - Labrador Retriever

What does this test assess?

This genetic test analyses the ATP7A c.980C>T variant in Labrador Retriever. The disorder and risk profile are described as copper toxicosis, copper storage disease, copper accumulation, copper-associated hepatopathy and copper-associated chronic hepatitis. This test analyses an ATP7A variant with a protective modifier effect in Labrador Retrievers. The variant does not by itself cause copper storage disease, but can influence the risk profile when an ATP7B risk variant is also present.

What does this condition mean?

Copper is required for normal metabolism, but excess copper in the liver damages liver cells. Dogs with copper toxicosis can appear normal for a long time and later develop increased liver enzymes, poor appetite, vomiting, lethargy, weight loss, jaundice, behavioural change, chronic hepatitis or liver cirrhosis. Diet, other genetic factors and breed background all influence how strongly the genotype is expressed.

Inheritance and result

Because ATP7A is located on the X chromosome, the result must be interpreted by sex. In Labrador Retrievers, the combination with ATP7B is most important: the ATP7A variant can reduce the copper accumulation risk created by ATP7B.

• Clear: the tested variant was not detected.
• Carrier/modifier: one copy of the variant was detected and is relevant for breeding or risk assessment.
• Two copies/highest variant dose: the variant is present twice, or for X-linked ATP7A present on the single X chromosome of a male.

Practical value of this test

This DNA test is practically useful because copper accumulation often becomes visible only late. An early genetic result helps breeders avoid risk matings, helps owners understand which dogs deserve extra attention and supports more targeted follow-up when liver values or family history make that relevant.

• Helps plan matings and identify dogs with relevant risk information.
• Enables combined interpretation with other copper metabolism tests.
• Provides concrete information for breed-focused selection and liver-health follow-up.