Dubin-Johnson and Rotor Syndromes (IMAGE)
Caption
RS and DJS are benign genetic causes of conjugated hyperbilirubinemia due to defects in hepatocellular transport of conjugated bilirubin and organic anions. DJS arises from MRP2 mutations that impair canalicular efflux of bilirubin glucuronides, producing conjugated hyperbilirubinemia. RS results from reduction or loss of function of the sinusoidal uptake transporters OATP1B1 and OATP1B3, leading to impaired hepatic clearance of conjugated bilirubin and increased urinary coproporphyrin excretion. In adults, both disorders follow a benign course, with fluctuating jaundice, preserved hepatic function, and no risk of progression to chronic liver disease. In DJS, some newborns have been reported to develop cholestasis, which was self-limited and resolved spontaneously with hepatic maturity. Importantly, impaired transporter activity may influence drug disposition, underscoring the need for clinical awareness to prevent misdiagnosis and to anticipate drug–disease interactions.
Extensive liver testing, biopsy, and genetic analysis are typically unnecessary and should be reserved for atypical cases or diagnostic uncertainty. Management requires no specific therapy. Reassurance of benign outcomes is important, and genetic counseling may be appropriate for families with confirmed mutations or when there is concern for inheritance.
Credit
Bianca Thakkar
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