Cited by 709Genetic Associations and EpidemiologyGenetic Mapping and Diversity in Plants and AnimalsGenetic diversity and population structure

Estimation of significance thresholds for genomewide association scans

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Dudbridge, Frank, Gusnanto, Arief·2008·Genetic Epidemiology

Abstract

The question of what significance threshold is appropriate for genomewide association studies is somewhat unresolved. Previous theoretical suggestions have yet to be validated in practice, whereas permutation testing does not resolve a discrepancy between the genomewide multiplicity of the experiment and the subset of markers actually tested. We used genotypes from the Wellcome Trust Case‐Control Consortium to estimate a genomewide significance threshold for the UK Caucasian population. We subsampled the genotypes at increasing densities, using permutation to estimate the nominal P‐value for 5% family‐wise error. By extrapolating to infinite density, we estimated the genomewide significance threshold to be about 7.2 × 10−8. To reduce the computation time, we considered Patterson's eigenvalue estimator of the effective number of tests, but found it to be an order of magnitude too low for multiplicity correction. However, by fitting a Beta distribution to the minimum P‐value from permutation replicates, we showed that the effective number is a useful heuristic and suggest that its estimation in this context is an open problem. We conclude that permutation is still needed to obtain genomewide significance thresholds, but with subsampling, extrapolation and estimation of an effective number of tests, the threshold can be standardized for all studies of the same population. Genet. Epidemiol. 2008. © 2008 Wiley‐Liss, Inc.

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Authors
Dudbridge, F., & Gusnanto, A.
Affiliations
MRC Biostatistics Unit (GB)
Corresponding author
Dudbridge, Frank
Venue
Genetic Epidemiology
Publisher
Wiley
Published
2008-02-25
Volume
32
Issue
3
Pages
227-234
ISSN
  • 0741-0395 (ISSN-L)
  • 1098-2272
OpenAlex
W2105239414
Cited by
703
References
26
Citations by year
2026: 18 · 2025: 24 · 2024: 26 · 2023: 30 · 2022: 26 · 2021: 36 · 2020: 45 · 2019: 32 · 2018: 49 · 2017: 32 · 2016: 30 · 2015: 36 · 2014: 47 · 2013: 47 · 2012: 46
FWCI
33.84
Type
journal article
Language
en
Open access
Locations
  • Genetic Epidemiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • LSHTM Research Online (London School of Hygiene and Tropical Medicine) (acceptedVersion)
Funders
Sixth Framework Programme (LSHM-CT-2004-503485)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
Keywords
genome-wide association study, permutation tests, family-wise error rate, multiple testing correction, subsampling, beta distribution, Wellcome Trust Case Control Consortium
MeSH terms
Genetic Markers, Genotype, United Kingdom, Humans, Genome, Human, Case-Control Studies, Genetic Predisposition to Disease, White People

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