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. 2015 Dec 20;24(25):7406-20.
doi: 10.1093/hmg/ddv440. Epub 2015 Oct 19.

Identification of shared and unique susceptibility pathways among cancers of the lung, breast, and prostate from genome-wide association studies and tissue-specific protein interactions

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Identification of shared and unique susceptibility pathways among cancers of the lung, breast, and prostate from genome-wide association studies and tissue-specific protein interactions

David C Qian et al. Hum Mol Genet. .

Abstract

Results from genome-wide association studies (GWAS) have indicated that strong single-gene effects are the exception, not the rule, for most diseases. We assessed the joint effects of germline genetic variations through a pathway-based approach that considers the tissue-specific contexts of GWAS findings. From GWAS meta-analyses of lung cancer (12 160 cases/16 838 controls), breast cancer (15 748 cases/18 084 controls) and prostate cancer (14 160 cases/12 724 controls) in individuals of European ancestry, we determined the tissue-specific interaction networks of proteins expressed from genes that are likely to be affected by disease-associated variants. Reactome pathways exhibiting enrichment of proteins from each network were compared across the cancers. Our results show that pathways associated with all three cancers tend to be broad cellular processes required for growth and survival. Significant examples include the nerve growth factor (P = 7.86 × 10(-33)), epidermal growth factor (P = 1.18 × 10(-31)) and fibroblast growth factor (P = 2.47 × 10(-31)) signaling pathways. However, within these shared pathways, the genes that influence risk largely differ by cancer. Pathways found to be unique for a single cancer focus on more specific cellular functions, such as interleukin signaling in lung cancer (P = 1.69 × 10(-15)), apoptosis initiation by Bad in breast cancer (P = 3.14 × 10(-9)) and cellular responses to hypoxia in prostate cancer (P = 2.14 × 10(-9)). We present the largest comparative cross-cancer pathway analysis of GWAS to date. Our approach can also be applied to the study of inherited mechanisms underlying risk across multiple diseases in general.

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Figures

Figure 1.
Figure 1.
Schematic overview of study design. Lung cancer is used as an illustrative example. (A) The lung cancer susceptibility network was constructed from the lung-expressed products of genes that are located within 10 kb of independent lung cancer-associated SNPs (‘key proteins’) along with mutual tissue-specific interaction partners (‘linking proteins’). (B) This cartoon depicts protein participants in a pathway from the Reactome database. Key proteins for lung cancer are bubbled in yellow. (C) Key proteins for both lung cancer and breast cancer involved in the same pathway are bubbled in orange, the intersection of yellow and red. Shared and unique key proteins between other cancer pairs are portrayed analogously. (D) Formula for the hypergeometric pathway enrichment P-value.

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