Human Molecular Genetics, Vol 5, 645-647, Copyright © 1996 by Oxford University Press
O Koiwai, S Aono, Y Adachi, T Kamisako, Y Yasui, M Nishizawa and H Sato
Crigler-Najjar syndrome type II (CN-II) is caused by a severely reduced
hepatic activity of bilirubin UDP-glucuronosyltransferase (UGT). Recently,
by the analysis of the genetic background of CN-II patients, it has been
clarified that the patients carry homozygous missense mutations or nonsense
plus missense mutations on the gene for UGT, and CN-II was inherited as an
autosomal recessive trait. We encountered a new case which had a nonsense
mutation caused by a single nucleotide substitution on one allele. This
indicates that CN-II is also inherited as a dominant trait as well as a
recessive trait. Expression study in vitro strongly suggests that the
disease in this case is caused by a dominant negative mutation by forming a
heterologous subunit structure.
ARTICLES
Crigler-Najjar syndrome type II is inherited both as a dominant and as a recessive trait
Laboratory of Biochemistry, Aichi Cancer Center Research Institute, Nagoya, Japan.
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