Coexistence of Gilbert syndrome with hereditary haemolytic anaemias

Journal of Clinical Pathology
Katarzyna RawaBeata Burzynska

Abstract

Gilbert syndrome is an inherited disease characterised by mild unconjugated hyperbilirubinaemia caused by mutations in UGT1A1 gene which lead to decreased activity of UDP-glucuronosyltransferase 1A1. The most frequent genetic defect is a homozygous TA dinucleotide insertion in the regulatory TATA box in the UGT1A1 gene promoter. 182 Polish healthy individuals and 256 patients with different types of hereditary haemolytic anaemias were examined for the A(TA)(n)TAA motif. PCR was performed using sense primer labelled by 6-Fam and capillary electrophoresis was carried out in an ABI 3730 DNA analyser. The frequency of the (TA)(7)/(TA)(7) genotype in the control group was estimated at 18.13%, (TA)(6)/(TA)(7) at 45.05% and (TA)(6)/(TA)(6) at 36.26%. There was a statistically significant difference in the (TA)(6)/(TA)(6) genotype distribution between healthy individuals and patients with glucose-6-phosphate dehydrogenase deficiency (p=0.041). Additionally, uncommon genotypes, (TA)(5)/(TA)(6), (TA)(5)/(TA)(7) and (TA)(7)/(TA)(8) of the promoter polymorphism, were discovered. Genotyping of the UGT1A1 gene showed distinct distribution of the common A(TA)(n)TAA polymorphism relative to other European populations. Because of a greater risk...Continue Reading

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