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Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants

The major enzyme responsible for the glucuronidation of bilirubin is the uridine 5′-diphosphoglucose glucuronosyltransferase A1 (UGT1A1) enzyme, and genetic variation in the UGT1A1 gene is reported to influence the bilirubin concentration in the blood. In this study, we have investigated which gene-...

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Autores principales: Kringen, Marianne K., Piehler, Armin P., Grimholt, Runa M., Opdal, Mimi S., Haug, Kari Bente F., Urdal, Petter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3938665/
https://www.ncbi.nlm.nih.gov/pubmed/24587300
http://dx.doi.org/10.1371/journal.pone.0090248
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author Kringen, Marianne K.
Piehler, Armin P.
Grimholt, Runa M.
Opdal, Mimi S.
Haug, Kari Bente F.
Urdal, Petter
author_facet Kringen, Marianne K.
Piehler, Armin P.
Grimholt, Runa M.
Opdal, Mimi S.
Haug, Kari Bente F.
Urdal, Petter
author_sort Kringen, Marianne K.
collection PubMed
description The major enzyme responsible for the glucuronidation of bilirubin is the uridine 5′-diphosphoglucose glucuronosyltransferase A1 (UGT1A1) enzyme, and genetic variation in the UGT1A1 gene is reported to influence the bilirubin concentration in the blood. In this study, we have investigated which gene-/haplotype variants may be useful for genetic testing of Gilbert's syndrome. Two groups of samples based on serum bilirubin concentrations were obtained from the Nordic Reference Interval Project Bio-bank and Database (NOBIDA): the 150 individuals with the highest bilirubin (>17.5 µmol/L) and the 150 individuals with normal bilirubin concentrations (<17.5 µmol/L). The individuals were examined for the TA(6)>TA(7) variant in the UGT1A1 promoter and 7 tag-SNPs in an extended promoter region of UGT1A1 (haplotype analysis) and in selected SNPs in candidate genes (SLCO1B3, ABCC2 and NUP153). We found significant odds ratios for high bilirubin level for all the selected UGT1A1 variants. However, in stepwise multivariate logistic regression analysis of all genetic variants together with age, sex, country of origin and fasting time, the repeat variants of UGT1A1 TA(6)>TA(7) and SLCO1B3 rs2117032 T>C were the only variants significantly associated with higher bilirubin concentrations. Most individuals with high bilirubin levels were homozygous for the TA(7)-repeat (74%) while only 3% were homozygous for the TA(7)-repeat in individuals with normal bilirubin levels. Among individuals heterozygous for the TA(7)-repeat, a low frequent UGT1A1-diplotype harboring the rs7564935 G-variant was associated with higher bilirubin levels. In conclusion, our results demonstrate that in testing for Gilbert's syndrome, analyzing for the homozygous TA(7)/TA(7)-genotype would be appropriate.
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spelling pubmed-39386652014-03-04 Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants Kringen, Marianne K. Piehler, Armin P. Grimholt, Runa M. Opdal, Mimi S. Haug, Kari Bente F. Urdal, Petter PLoS One Research Article The major enzyme responsible for the glucuronidation of bilirubin is the uridine 5′-diphosphoglucose glucuronosyltransferase A1 (UGT1A1) enzyme, and genetic variation in the UGT1A1 gene is reported to influence the bilirubin concentration in the blood. In this study, we have investigated which gene-/haplotype variants may be useful for genetic testing of Gilbert's syndrome. Two groups of samples based on serum bilirubin concentrations were obtained from the Nordic Reference Interval Project Bio-bank and Database (NOBIDA): the 150 individuals with the highest bilirubin (>17.5 µmol/L) and the 150 individuals with normal bilirubin concentrations (<17.5 µmol/L). The individuals were examined for the TA(6)>TA(7) variant in the UGT1A1 promoter and 7 tag-SNPs in an extended promoter region of UGT1A1 (haplotype analysis) and in selected SNPs in candidate genes (SLCO1B3, ABCC2 and NUP153). We found significant odds ratios for high bilirubin level for all the selected UGT1A1 variants. However, in stepwise multivariate logistic regression analysis of all genetic variants together with age, sex, country of origin and fasting time, the repeat variants of UGT1A1 TA(6)>TA(7) and SLCO1B3 rs2117032 T>C were the only variants significantly associated with higher bilirubin concentrations. Most individuals with high bilirubin levels were homozygous for the TA(7)-repeat (74%) while only 3% were homozygous for the TA(7)-repeat in individuals with normal bilirubin levels. Among individuals heterozygous for the TA(7)-repeat, a low frequent UGT1A1-diplotype harboring the rs7564935 G-variant was associated with higher bilirubin levels. In conclusion, our results demonstrate that in testing for Gilbert's syndrome, analyzing for the homozygous TA(7)/TA(7)-genotype would be appropriate. Public Library of Science 2014-02-28 /pmc/articles/PMC3938665/ /pubmed/24587300 http://dx.doi.org/10.1371/journal.pone.0090248 Text en © 2014 Kringen et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Kringen, Marianne K.
Piehler, Armin P.
Grimholt, Runa M.
Opdal, Mimi S.
Haug, Kari Bente F.
Urdal, Petter
Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants
title Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants
title_full Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants
title_fullStr Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants
title_full_unstemmed Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants
title_short Serum Bilirubin Concentration in Healthy Adult North-Europeans Is Strictly Controlled by the UGT1A1 TA-Repeat Variants
title_sort serum bilirubin concentration in healthy adult north-europeans is strictly controlled by the ugt1a1 ta-repeat variants
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3938665/
https://www.ncbi.nlm.nih.gov/pubmed/24587300
http://dx.doi.org/10.1371/journal.pone.0090248
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