A genome-wide association study of total bilirubin and cholelithiasis risk in sickle cell anemia.

PloS One
Jacqueline N MiltonElizabeth S Klings

Abstract

Serum bilirubin levels have been associated with polymorphisms in the UGT1A1 promoter in normal populations and in patients with hemolytic anemias, including sickle cell anemia. When hemolysis occurs circulating heme increases, leading to elevated bilirubin levels and an increased incidence of cholelithiasis. We performed the first genome-wide association study (GWAS) of bilirubin levels and cholelithiasis risk in a discovery cohort of 1,117 sickle cell anemia patients. We found 15 single nucleotide polymorphisms (SNPs) associated with total bilirubin levels at the genome-wide significance level (p value <5 × 10(-8)). SNPs in UGT1A1, UGT1A3, UGT1A6, UGT1A8 and UGT1A10, different isoforms within the UGT1A locus, were identified (most significant rs887829, p = 9.08 × 10(-25)). All of these associations were validated in 4 independent sets of sickle cell anemia patients. We tested the association of the 15 SNPs with cholelithiasis in the discovery cohort and found a significant association (most significant p value 1.15 × 10(-4)). These results confirm that the UGT1A region is the major regulator of bilirubin metabolism in African Americans with sickle cell anemia, similar to what is observed in other ethnicities.

Associated Clinical Trials

Nov 13, 2003·Michael DeBaun, Michael DeBaun

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Citations

Dec 10, 2013·Hematology·Swee Lay Thein
May 30, 2012·American Journal of Hematology·Martin H Steinberg, Paola Sebastiani
Feb 15, 2013·British Journal of Haematology·Jacqueline N MiltonMartin H Steinberg
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Methods Mentioned

BETA
genotyping
chip

Clinical Trials Mentioned

NCT00492531
NCT00072761

Software Mentioned

Openbugs
Haploview
BeadStudio
PLINK
EIGENSOFT
SITT
ProABEL
MaCH
EIGENSTRAT

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