Population genomics in a disease targeted primary cell model

Elin Grundberg, Tony Kwan, Bing Ge, Kevin C. L. Lam, Vonda Koka, Andreas Kindmark, Hans Mallmin, Joana Dias, Dominique J. Verlaan, Manon Ouimet, Daniel Sinnett, Fernando Rivadeneira, Karol Estrada, Albert Hofman, Joyce M. van Meurs, Andre Uitterlinden, Patrick Beaulieu, Alexandru Graziani, Eef Harmsen, Osten LjunggrenClaes Ohlsson, Dan Mellstrom, Magnus Karlsson, Olle Nilsson, Tomi Pastinen

Research output: Contribution to journalArticlepeer-review

74 Citations (SciVal)

Abstract

The common genetic variants associated with complex traits typically lie in noncoding DNA and may alter gene regulation in a cell type-specific manner. Consequently, the choice of tissue or cell model in the dissection of disease associations is important. We carried out an expression quantitative trait loci (eQTL) study of primary human osteoblasts (HOb) derived from 95 unrelated donors of Swedish origin, each represented by two independently derived primary lines to provide biological replication. We combined our data with publicly available information from a genome-wide association study (GWAS) of bone mineral density (BMD). The top 2000 BMD-associated SNPs (P < similar to 10(-3)) were tested for cis-association of gene expression in HObs and in lymphoblastoid cell lines (LCLs) using publicly available data and showed that HObs have a significantly greater enrichment ( threefold) of converging cis-eQTLs as compared to LCLs. The top 10 BMD loci with SNPs showing strong cis-effects on gene expression in HObs (P = 6 x 10(-10) - 7 x 10(-16)) were selected for further validation using a staged design in two cohorts of Caucasian male subjects. All 10 variants were tested in the Swedish MrOS Cohort (n = 3014), providing evidence for two novel BMD loci (SRR and MSH3). These variants were then tested in the Rotterdam Study ( n = 2090), yielding converging evidence for BMD association at the 17p13.3 SRR locus (P-combined = 5.6 x 10(-5)). The cis-regulatory effect was further fine-mapped to the proximal promoter of the SRR gene (rs3744270, r(2) = 0.5, P = 2.6 x 10 (15)). Our results suggest that primary cells relevant to disease phenotypes complement traditional approaches for prioritization and validation of GWAS hits for follow-up studies.
Original languageEnglish
Pages (from-to)1942-1952
JournalGenome Research
Volume19
Issue number11
DOIs
Publication statusPublished - 2009

Subject classification (UKÄ)

  • Genetics

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