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Rotor's syndrome. A distinct inheritable pathophysiologic entity

A W Wolkoff, E Wolpert, F N Pascasio

    The American Journal of Medicine
    |February 1, 1976
    PubMed
    Summary
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    Rotor's syndrome and Dubin-Johnson syndrome show distinct urinary coproporphyrin I excretion patterns, differentiating them as separate genetic disorders. This research clarifies their unique pathophysiologies and hepatic transport mechanisms.

    Area of Science:

    • Hepatology
    • Medical Genetics
    • Biochemistry

    Background:

    • Rotor's syndrome and Dubin-Johnson syndrome are rare, inherited disorders affecting bilirubin metabolism.
    • Both conditions are characterized by impaired hepatic transport mechanisms but present with distinct clinical and biochemical profiles.

    Purpose of the Study:

    • To investigate and compare urinary coproporphyrin isomer excretion in patients with Rotor's syndrome, Dubin-Johnson syndrome, and healthy controls.
    • To elucidate the pathophysiological differences between Rotor's syndrome and Dubin-Johnson syndrome based on porphyrin metabolism.

    Main Methods:

    • Quantification of total, isomer I, and isomer III coproporphyrin in urine samples.
    • Analysis of urinary coproporphyrin excretion in patients, family members, and control subjects.

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    Main Results:

    • Patients with Rotor's syndrome excreted 64.8% urinary coproporphyrin as isomer I, while Dubin-Johnson syndrome patients excreted 88.9%, significantly higher than controls (24.8%).
    • Total urinary coproporphyrin excretion was markedly increased in Rotor's syndrome patients compared to controls and heterozygotes.
    • Family members of Rotor's syndrome patients showed intermediate excretion levels, suggesting an autosomal recessive inheritance pattern.

    Conclusions:

    • Urinary coproporphyrin excretion patterns effectively distinguish Rotor's syndrome from Dubin-Johnson syndrome.
    • Both syndromes are distinct autosomal recessive disorders with unique impacts on hepatic transport.
    • Studying these rare disorders provides crucial insights into the functional dissociation of hepatic transport mechanisms.