Gilbert syndrome: the UGT1A1*28 promoter polymorphism as a biomarker of multifactorial diseases and drug metabolism

Author:

Gil Justyna1,Sąsiadek Maria M2

Affiliation:

1. Genetic Department, Medical University, Marcinkowskiego 1, 50-368 Wroclaw, Poland.

2. Genetic Department, Medical University, Marcinkowskiego 1, 50-368 Wroclaw, Poland

Abstract

Gilbert syndrome belongs to the group of the most common human metabolic disorders and is characterized by an elevated level of bilirubin in blood serum. A polymorphism of the 5´ end of the UGT1A1 gene promoter, a homozygous insertion of TA pairs (genotype UGT1A1*28/*28), results in a decrease in bilirubin glucuronidation activity and therefore leads to an increase in the level of unconjugated bilirubin (hyperbilirubinemia). Genotyping the UGT1A1 promoter is an important step in the determination of the etiology of free hyperbilirubinemia of unknown origin. Molecular diagnosis enables avoiding invasive diagnostic procedures, such as liver biopsy, in establishing the appropriate diagnosis and prognosis, as well as in establishing the correct therapeutic procedures in a variety of diseases (e.g., chemotherapy or bone marrow transplantation). Moreover, the UGT1A1*28/*28 genotype has emerged as an important element in drug tolerance, as well as in multifactorial diseases, such as cancer. However, the role of this polymorphism is still not completely understood. In this review we have summarized current knowledge and attempted to propose directions for further research.

Publisher

Future Medicine Ltd

Subject

Biochemistry (medical),Clinical Biochemistry,Drug Discovery

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