Disorders of metal metabolism: Wilson and Menkes disease — branching viva

Branching viva on the inherited copper transport disorders: the unifying ATPase concept, the three faces of Wilson disease and the integrated copper panel, the Leipzig score, the chelation-zinc-transplant management ladder, the acute Wilsonian crisis, and the infantile regression and copper histidinate therapy of Menkes disease with its X-linked counselling.

branching clinical structured oral4 min readVerification in progress

Prompt

A 13-year-old boy presents with a progressive wing-beating tremor, dysarthria, deteriorating school performance and chronic transaminitis, with golden-brown corneal deposits on slit-lamp examination. The examiner asks: what is the unifying concept that links this disease to Menkes disease, what is the integrated copper panel and the Leipzig score, what are the three therapeutic pillars and why is trientine preferred for initial therapy, what is the acute Wilsonian crisis and its management, and then branches to a 3-month-old boy with hypotonia, seizures, kinky hair and low serum copper, asking you to explain the copper egress block, the enzyme-to-feature mapping, the copper histidinate treatment window, and the X-linked counselling.

Opening framework

My framework rests on a single unifying concept. Wilson disease and Menkes disease are both disorders of the copper-transporting ATPase, a membrane pump that moves copper across a biological barrier. ATP7B sits in the hepatocyte and excretes copper into bile; when it fails, copper accumulates (toxicity) and poisons the liver, basal ganglia and cornea. ATP7A sits in the gut enterocyte and the blood-brain barrier and ferries dietary copper into the body; when it fails, copper is trapped in the enterocyte and the body is starved (deficiency). Same ion, same protein family, the opposite clinical problem - and the treatment follows the direction: remove copper in Wilson, replace copper in Menkes. ^[1] ^[5]

References6Show

[1]Schilsky ML, Roberts EA, Bronstein JM, et al. A multidisciplinary approach to the diagnosis and management of Wilson disease: Executive summary of the 2022 Practice Guidance on Wilson disease from the American Association for the Study of Liver Diseases. Hepatology, 2023.PMID 36152019
[2]Ferenci P, Caca K, Loudianos G, et al. Diagnosis and phenotypic classification of Wilson disease. Liver Int, 2003.PMID 12955875
[3]Schilsky ML. Wilson Disease: Diagnosis, Treatment, and Follow-up. Clin Liver Dis, 2017.PMID 28987261
[4]Kaler SG, Holmes CS, Goldstein DS, et al. Neonatal diagnosis and treatment of Menkes disease. N Engl J Med, 2008.PMID 18256395
[5]Tümer Z, Møller LB. Menkes disease. Eur J Hum Genet, 2010.PMID 19888294
[9]Schilsky ML. Liver transplantation for Wilson's disease. Ann N Y Acad Sci, 2014.PMID 24820352

Disorders of metal metabolism: Wilson and Menkes disease — branching viva

branching clinical structured oral4 min readVerification in progress

Opening framework

References6Show

[1]Schilsky ML, Roberts EA, Bronstein JM, et al. A multidisciplinary approach to the diagnosis and management of Wilson disease: Executive summary of the 2022 Practice Guidance on Wilson disease from the American Association for the Study of Liver Diseases. Hepatology, 2023.PMID 36152019
[2]Ferenci P, Caca K, Loudianos G, et al. Diagnosis and phenotypic classification of Wilson disease. Liver Int, 2003.PMID 12955875
[3]Schilsky ML. Wilson Disease: Diagnosis, Treatment, and Follow-up. Clin Liver Dis, 2017.PMID 28987261
[4]Kaler SG, Holmes CS, Goldstein DS, et al. Neonatal diagnosis and treatment of Menkes disease. N Engl J Med, 2008.PMID 18256395
[5]Tümer Z, Møller LB. Menkes disease. Eur J Hum Genet, 2010.PMID 19888294
[9]Schilsky ML. Liver transplantation for Wilson's disease. Ann N Y Acad Sci, 2014.PMID 24820352