A unique genome-wide association analysis in extended Utah high-risk pedigrees identifies a novel melanoma risk variant on chromosome arm 10q.
- Authors
- Teerlink, Craig; Farnham, James; Allen-Brady, Kristina; Camp, Nicola J; Thomas, Alun; Leachman, Sancy; Cannon-Albright, Lisa
- Year
- 2012
- Journal
- Human genetics
- PMID
- 21706340
- DOI
- 10.1007/s00439-011-1048-z
Only two genome-wide association (GWA) screens have been published for melanoma (Nat Genet 47:920-925, 2009; Nat Genet 40:838-840, 2008). Using a unique approach, we performed a genome-wide association study in 156 related melanoma cases from 34 high-risk Utah pedigrees. Genome-wide association analysis was performed on nearly 500,000 markers; we compared cases to 2,150 genotypically matched samples from Illumina's iControls database. We performed genome-wide association with EMMAX software, which is designed to account for population structure, including relatedness between cases. Three SNPs exceeded a genome-wide significance threshold of p < 5 × 10(-8) on chromosome arm 10q25.1 (rs17119434, rs17119461, and rs17119490), where the most extreme p value was 7.21 × 10(-12). This study represents a new and unique approach to predisposition gene identification; and it is the first genome-wide association study performed in related cases in high-risk pedigrees. Our approach illustrates an example of using high-risk pedigrees for the identification of new melanoma predisposition variants.
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