Journal Article

Mapping of the <i>UGT1A</i> locus identifies an uncommon coding variant that affects mRNA expression and protects from bladder cancer

Wei Tang, Yi-Ping Fu, Jonine D. Figueroa, Núria Malats, Montserrat Garcia-Closas, Nilanjan Chatterjee, Manolis Kogevinas, Dalsu Baris, Michael Thun, Jennifer L. Hall, Immaculata De Vivo, Demetrius Albanes, Patricia Porter-Gill, Mark P. Purdue, Laurie Burdett, Luyang Liu, Amy Hutchinson, Timothy Myers, Adonina Tardón, Consol Serra, Alfredo Carrato, Reina Garcia-Closas, Josep Lloreta, Alison Johnson, Molly Schwenn, Margaret R. Karagas, Alan Schned, Amanda Black, Eric J. Jacobs, W. Ryan Diver, Susan M. Gapstur, Jarmo Virtamo, David J. Hunter, Joseph F. Fraumeni, Stephen J. Chanock, Debra T. Silverman, Nathaniel Rothman and Ludmila Prokunina-Olsson

in Human Molecular Genetics

Volume 21, issue 8, pages 1918-1930
Published in print April 2012 | ISSN: 0964-6906
Published online January 2012 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddr619
Mapping of the UGT1A locus identifies an uncommon coding variant that affects mRNA expression and protects from bladder cancer

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A recent genome-wide association study of bladder cancer identified the UGT1A gene cluster on chromosome 2q37.1 as a novel susceptibility locus. The UGT1A cluster encodes a family of UDP-glucuronosyltransferases (UGTs), which facilitate cellular detoxification and removal of aromatic amines. Bioactivated forms of aromatic amines found in tobacco smoke and industrial chemicals are the main risk factors for bladder cancer. The association within the UGT1A locus was detected by a single nucleotide polymorphism (SNP) rs11892031. Now, we performed detailed resequencing, imputation and genotyping in this region. We clarified the original genetic association detected by rs11892031 and identified an uncommon SNP rs17863783 that explained and strengthened the association in this region (allele frequency 0.014 in 4035 cases and 0.025 in 5284 controls, OR = 0.55, 95%CI = 0.44–0.69, P = 3.3 × 10−7). Rs17863783 is a synonymous coding variant Val209Val within the functional UGT1A6.1 splicing form, strongly expressed in the liver, kidney and bladder. We found the protective T allele of rs17863783 to be associated with increased mRNA expression of UGT1A6.1 in in-vitro exontrap assays and in human liver tissue samples. We suggest that rs17863783 may protect from bladder cancer by increasing the removal of carcinogens from bladder epithelium by the UGT1A6.1 protein. Our study shows an example of genetic and functional role of an uncommon protective genetic variant in a complex human disease, such as bladder cancer.

Journal Article.  8225 words.  Illustrated.

Subjects: Genetics and Genomics

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