Inheritance of the Dubin-Johnson Syndrome

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Abstract
Urinary total, isomer I, and isomer III coproporphyrin excretion was determined in 16 patients with the Dubin-Johnson syndrome, 73 phenotypically normal family members, and 20 unrelated normal controls of similar age. Normal subjects excreted 24.8 ± 1.3 per cent (mean ± S.E.M.) of urinary coproporphyrin as coproporphyrin I. Patients with the syndrome excreted 88.9 ± 1.3 per cent (mean ± S.E.M.) as coproporphyrin I (p less than 0.001). Twenty-five phenotypically normal parents and children of patients with the syndrome excreted 31.6 ± 1.2 per cent (mean ± S.E.M.) as coproporphyrin I, a value intermediate between results in patients and normal subjects (p less than 0.001). In 48 phenotypically normal more distant relatives, the percentage excretion of coproporphyrin I was distributed over a wide range. These results indicate that, with respect to urinary coproporphyrin excretion, the Dubin-Johnson syndrome is inherited as an autosomal recessive characteristic.