First application of next-generation sequencing in four families with Wilson disease in Morocco

Abstract

Background: Wilson disease is a rare autosomal recessive disorder characterized by toxic accumulation of copper in various organs, principally in the liver and brain. The disease can be manifested with hepatic, neurologic and ophthalmic signs and in a rare case with psychiatric, hematological, renal and skeletal signs; symptoms vary among and within families. Traditionally, Wilson disease was diagnosed on the basis of biochemical markers which include low ceruloplasmin levels and elevated urinary and hepatic copper. However, theses parameters are not specific and can been seen in other disorders. Genetic testing is now considering the most specific test allowing a precise diagnosis. In this study, we report the results of molecular analysis of four unrelated patients with Wilson disease from Morocco; we used a next-generation sequencing customized multigene panel to investigate the ATP7B gene for the four unrelated patients with Wilson disease. Results: Genetic tests based on next-generation sequencing allow to the identification of four previously described variants. One in compound heterozygous state and three at homozygous state. Conclusions: Our results confirm the clinical diagnosis of Wilson disease in these reported families and have implications for their genetic counselling and clinical management. Diagnosis of Wilson disease is a major challenge in clinical practice, and Genetic testing of ATP7B gene should be recommended in patients with suspected Wilson disease.