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Updated: May 31, 2026

Measurement of Heme Synthesis Levels in Mammalian Cells
Published on: July 9, 2015
Bilirubin dependence on UGT1A1 polymorphisms, hemoglobin, fasting time and body mass index
Carina Rodrigues1, Elísio Costa2, Emília Vieira3
1Department of Biological Sciences, Biochemistry Laboratory, Faculty of Pharmacy of Oporto University, Porto; Health College of Polytechnic Institute of Bragança, Bragança.
Abstract:
In humans, bilirubin levels are influenced by different factors. This study evaluates how several nongenetic causes and the genetic UGT1A1 polymorphisms contribute for bilirubin levels, in a cohort of 146 young Caucasian females. Hematological data, bilirubin, screening of TA duplication in the UGT1A1 gene, body mass index (BMI) and body fat were determined. A questionnaire about fasting time, smoking habits, oral contraceptive therapy, caloric intake and physical activity was done. Participants were divided according to the tertiles of bilirubin. Subjects from the second and third tertile had significant rises in hemoglobin (Hb), hematocrit, mean cell Hb and mean cell Hb concentration, and a significant increased frequency for the c.-41_-40dupTA allele in homozygosity, when compared to the first tertile. Red blood cell count was significantly increased in the third tertile. Results showed that the c.-41_-40dupTA allele (genetic), Hb, BMI and fasting time (nongenetic) were the main factors associated bilirubin levels.
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