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Multi-locus stepwise regression: a haplotype-based algorithm for finding genetic associations applied to atopic dermatitis

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Item Type:Article
Title:Multi-locus stepwise regression: a haplotype-based algorithm for finding genetic associations applied to atopic dermatitis
Creators Name:Knuppel, S. and Esparza-Gordillo, J. and Marenholz, I. and Holzhutter, H. and Bauerfeind, A. and Ruether, A. and Weidinger, S. and Lee, Y.A. and Rohde, K.
Abstract:BACKGROUND: Genome-wide association studies (GWAS) provide an increasing number of single nucleotide polymorphisms (SNPs) associated with diseases. Our aim is to exploit those closely spaced SNPs in candidate regions for a deeper analysis of association beyond single SNP analysis, combining the classical stepwise regression approach with haplotype analysis to identify risk haplotypes for complex diseases. METHODS: Our proposed multi-locus stepwise regression starts with an evaluation of all pair-wise SNP combinations and then extends each SNP combination stepwise by one SNP from the region, carrying out haplotype regression in each step. The best associated haplotype patterns are kept for the next step and must be corrected for multiple testing at the end. These haplotypes should also be replicated in an independent data set. We applied the method to a region of 259 SNPs from the epidermal differentiation complex (EDC) on chromosome 1q21 of a German GWAS using a case control set (1,914 individuals) and to 268 families with at least two affected children as replication. RESULTS: A 4-SNP haplotype pattern with high statistical significance in the case control set (p=4.13x10-7 after Bonferroni correction) could be identified which remained significant in the family set after Bonferroni correction (p=0.0398). Further analysis revealed that this pattern reflects mainly the effect of the well-known FLG gene; however, a FLG-independent haplotype in case control set (OR=1.71, 95% CI: 1.32 2.23, p=5.6x10-5) and family set (OR=1.68, 95% CI: 1.18-2.38, p=2.19x10-3) could be found in addition. CONCLUSION: Our approach is a useful tool for finding allele combinations associated with diseases beyond single SNP analysis in chromosomal candidate regions.
Keywords:Algorithms, Atopic Dermatitis, Case-Control Studies, Genome-Wide Association Study, Genotype, Haplotypes, Intermediate Filament Proteins, Odds Ratio, Pair 1 Human Chromosomes, Regression Analysis, Single Nucleotide Polymorphism
Source:BMC Medical Genetics
Publisher:BioMed Central
Page Range:8
Date:27 January 2012
Official Publication:https://doi.org/10.1186/1471-2350-13-8
PubMed:View item in PubMed

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