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A mutation in bilirubin uridine 5'-diphosphate-glucuronosyltransferase isoform 1 causing Crigler-Najjar syndrome type II. 1993

P J Bosma, and B Goldhoorn, and R P Oude Elferink, and M Sinaasappel, and B A Oostra, and P L Jansen
Department of Hepatogastroenterology, Academisch Medisch Centrum, Amsterdam, The Netherlands.

BACKGROUND Inherited unconjugated hyperbilirubinemia in Crigler-Najjar type II (CN II) is caused by a strong reduction of bilirubin uridine 5'-diphosphate-glucuronosyltransferase (B-UGT) activity. Both B-UGT isoenzymes (B-UGT1 and B-UGT2) identified in humans are derived from a single gene by alternative splicing. To clarify the genetic background of CN II and the role of both B-UGT forms in the physiological clearance of bilirubin, we have studied a large kindred with two CN II patients. METHODS From genomic DNA all B-UGT encoding exons were amplified by polymerase chain reaction and sequenced to identify mutations causing CN II. RESULTS The CN II patients were found to be homozygous for a nucleotide shift in the unique region of B-UGT1, changing a arginine into a tryptophan, and also for a nucleotide shift in the unique region of B-UGT2, changing a leucine into a valine. Analysis of other family members and of 50 control subjects showed that the mutation in B-UGT1 causes CN II, whereas the mutation in B-UGT2 is a polymorphism. CONCLUSIONS CN II syndrome appears to be caused by a homozygous mutation in B-UGT1. This indicates that B-UGT1 is the physiological important bilirubin glucuronidating isoform.

UI MeSH Term Description Entries
D007527 Isoenzymes Structurally related forms of an enzyme. Each isoenzyme has the same mechanism and classification, but differs in its chemical, physical, or immunological characteristics. Alloenzyme,Allozyme,Isoenzyme,Isozyme,Isozymes,Alloenzymes,Allozymes
D008297 Male Males
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D010375 Pedigree The record of descent or ancestry, particularly of a particular condition or trait, indicating individual family members, their relationships, and their status with respect to the trait or condition. Family Tree,Genealogical Tree,Genealogic Tree,Genetic Identity,Identity, Genetic,Family Trees,Genealogic Trees,Genealogical Trees,Genetic Identities,Identities, Genetic,Tree, Family,Tree, Genealogic,Tree, Genealogical,Trees, Family,Trees, Genealogic,Trees, Genealogical
D003414 Crigler-Najjar Syndrome A familial form of congenital hyperbilirubinemia transmitted as an autosomal recessive trait. It is characterized by icterus and brain damage caused by a glucuronyl transferase deficiency in the liver and faulty bilirubin conjugation. Crigler Najjar Syndrome,Crigler Najjar Syndrome, Type 1,Crigler-Najar Syndrome,Crigler-Najjar Syndrome, Type I,Familial Nonhemolytic Unconjugated Hyperbilirubinemia,Hereditary Unconjugated Hyperbilirubinemia,Crigler Najar Syndrome,Crigler Najjar Syndrome, Type I,Crigler Najjar Syndromes,Hereditary Unconjugated Hyperbilirubinemias,Hyperbilirubinemia, Hereditary Unconjugated,Najjar Syndrome, Crigler,Syndrome, Crigler Najjar,Unconjugated Hyperbilirubinemia, Hereditary
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D014453 Glucuronosyltransferase A family of enzymes accepting a wide range of substrates, including phenols, alcohols, amines, and fatty acids. They function as drug-metabolizing enzymes that catalyze the conjugation of UDPglucuronic acid to a variety of endogenous and exogenous compounds. EC 2.4.1.17. Glucuronyltransferase,UDP Glucuronosyltransferase,17 beta-Hydroxysteroid UDP-Glucuronosyltransferase,4-Nitrophenol-UDP-Glucuronosyltransferase,7-Hydroxycoumarin UDP Glucuronyltransferase,Androsterone UDP-Glucuronosyltransferase,Bilirubin UDP-Glucuronyltransferase,Estrogen UDP-Glucuronosyltransferase,Estrone Glucuronyltransferase,Glucuronic Transferase,Morphine Glucuronyltransferase,UDP Glucuronyl Transferase,UDP-Glucuronic Acid 3-O-beta-D-Galactosyl-D-Galactose Glucuronosyltransferase,p-Nitrophenyl UDP-Glucuronosyltransferase,17 beta Hydroxysteroid UDP Glucuronosyltransferase,4 Nitrophenol UDP Glucuronosyltransferase,7 Hydroxycoumarin UDP Glucuronyltransferase,Androsterone UDP Glucuronosyltransferase,Bilirubin UDP Glucuronyltransferase,Estrogen UDP Glucuronosyltransferase,Glucuronosyltransferase, UDP,Glucuronyl Transferase, UDP,Glucuronyltransferase, 7-Hydroxycoumarin UDP,Glucuronyltransferase, Estrone,Glucuronyltransferase, Morphine,Transferase, Glucuronic,Transferase, UDP Glucuronyl,UDP Glucuronic Acid 3 O beta D Galactosyl D Galactose Glucuronosyltransferase,UDP Glucuronyltransferase, 7-Hydroxycoumarin,UDP-Glucuronosyltransferase, 17 beta-Hydroxysteroid,UDP-Glucuronosyltransferase, Androsterone,UDP-Glucuronosyltransferase, Estrogen,UDP-Glucuronosyltransferase, p-Nitrophenyl,UDP-Glucuronyltransferase, Bilirubin,p Nitrophenyl UDP Glucuronosyltransferase

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