Wilson disease is a treatable inherited disorder in which copper accumulates, particularly in the liver, brain and eyes. Its presentation can cross specialty boundaries: liver disease, movement difficulties and psychiatric symptoms may bring a person to different services. Understanding how genetic evidence fits alongside the clinical assessment helps avoid treating one laboratory result as the entire diagnosis. MedlinePlus Genetics describes this multisystem presentation.
Connect the gene to copper handling
ATP7B provides instructions for a protein involved in copper transport and removal of excess copper. Disease-causing variants impair that function, allowing copper to accumulate and damage tissues. Copper itself is necessary for normal cellular functions; the problem is its excessive accumulation. This distinction helps explain why a genetic disorder of copper handling requires assessment of organ involvement as well as DNA. MedlinePlus Genetics
Wilson disease follows autosomal recessive inheritance, involving disease-causing changes in both gene copies. Parents who carry one altered copy usually have no signs of the condition. An apparently unaffected parental generation therefore fits the inheritance pattern rather than arguing against it. MedlinePlus Genetics
Build a combined diagnostic assessment
The diagnostic assessment brings together medical and family history, examination, an eye assessment and laboratory testing. Blood tests can assess ceruloplasmin, copper, liver enzymes and evidence of anaemia. A slit-lamp examination looks for Kayser–Fleischer rings. These investigations examine different aspects of the disease and need interpretation together. NIDDK diagnostic overview
Ceruloplasmin is often low, but it can be normal in Wilson disease. Blood copper may also be lower than expected despite excess copper in tissues; acute liver failure can instead produce high blood copper. A simple assumption that copper overload must mean high blood copper can therefore mislead. NIDDK
A 24-hour urine collection measures copper excretion, which is often increased. Collection uses a suitable copper-free container. When blood and urine findings remain inconclusive, liver biopsy may provide tissue for copper measurement and assessment of liver damage. These are components of an investigation, rather than interchangeable standalone answers. NIDDK
Read the molecular result precisely
In someone with suggestive findings, pathogenic or likely pathogenic variants affecting both copies of ATP7B can establish the diagnosis within the diagnostic framework described in GeneReviews. Two variants of uncertain significance, or one pathogenic variant together with one uncertain variant, neither establish nor exclude Wilson disease. The number of reported variants cannot substitute for their interpretation. GeneReviews: establishing the diagnosis
An incomplete molecular result also raises an assay question. Sequence analysis may miss exon-level or whole-gene deletions and duplications, depending on the method. GeneReviews describes deletion/duplication analysis when sequencing identifies only one or no variant. Clinicians reviewing an unresolved result should establish what the laboratory actually assessed. GeneReviews: molecular testing
Assess relatives before symptoms appear
Family assessment has a different starting point from investigating symptomatic disease. NHS genomics guidance recommends screening siblings and explains that normal biochemical findings in an at-risk relative cannot reliably distinguish an asymptomatic person with biallelic pathogenic variants from a carrier or non-carrier. Feeling well and having reassuring biochemical results do not necessarily resolve inherited status. NHS Genomics Education: inheritance and counselling
When both parents are carriers, each pregnancy has a 25% chance of an affected child, a 50% chance of a carrier and a 25% chance of a child who inherits neither altered copy. These probabilities support family counselling without predicting the clinical course of an affected child. NHS Genomics Education
Separate established care from research
Established management requires specialist care, treatment to control copper accumulation and ongoing monitoring. Acute liver failure is an emergency. NHS guidance describes copper chelation as a mainstay of care and states that there are currently no approved gene therapies for Wilson disease. Research into genetic treatments therefore belongs in a separate discussion from available clinical management; a molecular diagnosis does not itself make an experimental treatment established care. NHS Genomics Education: management