Genetic basis of common human disease: insight into the role of nonsynonymous SNPs from genome-wide association studies
© Pal and Moult; licensee BioMed Central Ltd. 2011
Published: 19 September 2011
Recent genome-wide association studies have led to the reliable identification of single nucleotide polymorphisms (SNPs) at a number of loci associated with an increased risk of developing specific common human diseases. Each such locus implicates multiple possible candidate SNPs as being involved in the disease mechanism, and determining which SNPs actually contribute, and by what mechanism, is a major challenge. A variety of mechanisms may link the presence of a SNP to altered in vivo gene product function and hence contribute to disease risk. We have analyzed the role of one of these mechanisms, nonsynonymous SNPs (nsSNPs) in proteins, for associations found in the Wellcome Trust Case-Control Consortium (WTCCC) study of seven common diseases  and the follow-up work.
Using HapMap data and linkage disequilibrium information, we identified all possible candidate SNPs associated with increased disease risk. We then applied two computational methods [2, 3], based on analysis of protein structure and sequence, to determine which of these SNPs has a significant impact on in vivo protein function (SNPs3D) .
Several of these disease-associated loci were found to be linked to one or more high-impact nsSNPs. In some cases, these SNPs are in well-known proteins (such as human leukocyte antigens). In other cases, they are in less well-established disease-associated genes (for example, MST1 for Crohn’s disease), and in yet others, they are in proteins that have been poorly investigated (for example, gasdermin B, also for Crohn’s disease). Approximately 55% of these disease-associated loci have at least one nsSNP, and about 33% of them have at least one high-impact nsSNP in those regions.
Together, these data suggest a significant role for nsSNPs in common human disease susceptibility.
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