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Investigation of the molecular basis of the genetic deficiency of UDP‐glucuronosyl‐transferase in Crigler‐Najjar syndrome
Author(s) -
Robertson K. J.,
Clarke D.,
Sutherland L.,
Wooster R.,
Coughtrie M. W. H.,
Burchell B.
Publication year - 1991
Publication title -
journal of inherited metabolic disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 102
eISSN - 1573-2665
pISSN - 0141-8955
DOI - 10.1007/bf01797927
Subject(s) - bilirubin , population , glucuronosyltransferase , endocrinology , medicine , chemistry , biology , biochemistry , enzyme , microsome , environmental health
Summary Liver biopsy samples were obtained from eight Crigler‐Najjar patients. Bilirubin UDPGT activity, assayed by a microassay with HPLC analysis, was not detectable in type I livers, and low levels (9–26% of controls) of monoglucuronide conjugates only were observed in type II livers. 1‐Naphthol UDPGT activity was normal in most patients, where membrane integrity was maintained by correct sample procurement and preparation. Our data on type II livers suggest that a defect in UDPGA transport is an unlikely cause of the hyperbilirubinaemia, but reduced affinity for UDPGA was observed in one sample. Analysis of four patient liver samples by immunoblot analysis revealed the heterogeneous nature of this inherited disease within the patient population, and one sample where 1‐naphthol UDPGT activity was considerably reduced appeared to correlate with the non‐detection of a phenol UDPGT protein. Progress towards a molecular genetic diagnosis of Crigler‐Najjar syndromes is discussed.