Cited by 26Bioinformatics and Genomic NetworksGenetic Associations and EpidemiologyBiomedical Text Mining and Ontologies

Systematic permutation testing in GWAS pathway analyses: identification of genetic networks in dilated cardiomyopathy and ulcerative colitis

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Backes, Christina, Rühle, Frank, Stoll, Monika, Haas, Jan, Frese, Karen, Franke, Andre, Lieb, Wolfgang, Wichmann, H-Erich +7 more·2014·BMC Genomics

Abstract

BACKGROUND: Genome wide association studies (GWAS) are applied to identify genetic loci, which are associated with complex traits and human diseases. Analogous to the evolution of gene expression analyses, pathway analyses have emerged as important tools to uncover functional networks of genome-wide association data. Usually, pathway analyses combine statistical methods with a priori available biological knowledge. To determine significance thresholds for associated pathways, correction for multiple testing and over-representation permutation testing is applied. RESULTS: We systematically investigated the impact of three different permutation test approaches for over-representation analysis to detect false positive pathway candidates and evaluate them on genome-wide association data of Dilated Cardiomyopathy (DCM) and Ulcerative Colitis (UC). Our results provide evidence that the gold standard - permuting the case-control status - effectively improves specificity of GWAS pathway analysis. Although permutation of SNPs does not maintain linkage disequilibrium (LD), these permutations represent an alternative for GWAS data when case-control permutations are not possible. Gene permutations, however, did not add significantly to the specificity. Finally, we provide estimates on the required number of permutations for the investigated approaches. CONCLUSIONS: To discover potential false positive functional pathway candidates and to support the results from standard statistical tests such as the Hypergeometric test, permutation tests of case control data should be carried out. The most reasonable alternative was case-control permutation, if this is not possible, SNP permutations may be carried out. Our study also demonstrates that significance values converge rapidly with an increasing number of permutations. By applying the described statistical framework we were able to discover axon guidance, focal adhesion and calcium signaling as important DCM-related pathways and Intestinal immune network for IgA production as most significant UC pathway.

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  • The permutation test provides control over family-wise error rate, is nonparametric, automatically adjusts to the degree of correlation between tests, and does not make specific assumptions about the shape of the population distribution.

    “The permutation test provides control over family-wise error rate, is nonparametric, automatically adjusts to the degree of correlation between tests, and does not make specific assumptions about the shape of the population distribution from which the observations have been derived (Backes et al. 2014).”

    From Joint attention and brain functional connectivity in infants and toddlers (2017) · cites this paper as Backes et al. 2014

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Authors
Backes, C., Rühle, F., Stoll, M., Haas, J., Frese, K., Franke, A., Lieb, W., Wichmann, H.-E., Weis, T., Kloos, W., Lenhof, H.-P., Meese, E., Katus, H., Meder, B., & Keller, A.
Affiliations
  • Saarland University (DE)
  • University of Münster (DE)
  • University Hospital Heidelberg (DE)
  • Christian-Albrechts-Universität zu Kiel (DE)
  • Helmholtz Munich (DE)
Corresponding author
Keller, Andreas
Venue
BMC Genomics
Published
2014-07-22
Volume
15
Issue
1
Pages
622-622
ISSN
1471-2164 (ISSN-L)
OpenAlex
W2150472995
Cited by
26
References
55
Citations by year
2026: 1 · 2025: 2 · 2023: 2 · 2021: 4 · 2019: 7 · 2018: 4 · 2017: 3 · 2016: 1 · 2015: 2
FWCI
0.82
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • BMC Genomics (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • heiDOK (Heidelberg University) (acceptedVersion, other-oa)
  • Open access LMU (Ludwid Maxmilian's Universitat Munchen) (submittedVersion)
  • Site cant be reached (submittedVersion, cc-by)
Funders
  • Deutsches Zentrum für Herz-Kreislaufforschung
  • European Commission
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biomedical Text Mining and Ontologies
Keywords
permutation tests, pathway analysis, over-representation analysis, dilated cardiomyopathy, ulcerative colitis, multiple testing correction, hypergeometric test, gene networks, axon guidance, focal adhesions, calcium signaling
MeSH terms
Cardiomyopathy, Dilated, Colitis, Ulcerative, Humans, Signal Transduction, Polymorphism, Single Nucleotide, Genomics, Gene Regulatory Networks, Genome-Wide Association Study

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