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Epistasis pp 217–255Cite as

Identification of Genome-Wide SNP–SNP and SNP–Clinical Boolean Interactions in Age-Related Macular Degeneration

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Part of the book series: Methods in Molecular Biology ((MIMB,volume 1253))

Abstract

We propose here a methodology to uncover modularities in the network of SNP–SNP interactions most associated with disease. We start by computing all possible Boolean binary SNP interactions across the whole genome. By constructing a weighted graph of the most relevant interactions and via a combinatorial optimization approach, we find the most highly interconnected SNPs. We show that the method can be easily extended to find SNP/environment interactions. Using a modestly sized GWAS dataset of age-related macular degeneration (AMD), we identify a group of only 19 SNPs, which include those in previously reported regions associated to AMD. We also uncover a larger set of loci pointing to a matrix of key processes and functions that are affected. The proposed integrative methodology extends and overlaps traditional statistical analysis in a natural way. Combinatorial optimization techniques allow us to find the kernel of the most central interactions, complementing current methods of GWAS analysis and also enhancing the search for gene–environment interaction.

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Acknowledgements

This work was supported by the National Health and Medical Research Council [Grant 512423 Genes and environment in the risk of early age-related macular degeneration: a population-based case-control study, to J.J.W., P.M., and J.A., and fellowship scheme to E.G.H.]. We are grateful to Katrina Bogan for her careful revision of the manuscript.

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Riveros, C. et al. (2015). Identification of Genome-Wide SNP–SNP and SNP–Clinical Boolean Interactions in Age-Related Macular Degeneration. In: Moore, J., Williams, S. (eds) Epistasis. Methods in Molecular Biology, vol 1253. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-2155-3_12

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