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A more accurate method for colocalisation analysis allowing for multiple causal variants

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  • Chris Wallace

Abstract

In genome-wide association studies (GWAS) it is now common to search for, and find, multiple causal variants located in close proximity. It has also become standard to ask whether different traits share the same causal variants, but one of the popular methods to answer this question, coloc, makes the simplifying assumption that only a single causal variant exists for any given trait in any genomic region. Here, we examine the potential of the recently proposed Sum of Single Effects (SuSiE) regression framework, which can be used for fine-mapping genetic signals, for use with coloc. SuSiE is a novel approach that allows evidence for association at multiple causal variants to be evaluated simultaneously, whilst separating the statistical support for each variant conditional on the causal signal being considered. We show this results in more accurate coloc inference than other proposals to adapt coloc for multiple causal variants based on conditioning. We therefore recommend that coloc be used in combination with SuSiE to optimise accuracy of colocalisation analyses when multiple causal variants exist.Author summary: Genetic association studies have found evidence that human disease risk or other traits are under the influence of genetic variants. As results of studies are made publicly available, more research focuses on whether different traits are under influence of the same variants, which may help us understand how variants lead to differences in disease risk. However, one of the popular methods to answer this question, coloc, makes the simplifying assumption that no two members of the set of causal variants for any one trait are close to each other. Here, we examine the potential of the recently proposed Sum of Single Effects (SuSiE) regression framework, for use with coloc. SuSiE is a novel approach that allows evidence for association at multiple causal variants in proximity to be evaluated simultaneously. We show this results in more accurate coloc inference than other proposals to adapt coloc for multiple causal variants based on conditioning. We therefore recommend that coloc be used in combination with SuSiE to optimise accuracy of colocalisation analyses when multiple causal variants exist.

Suggested Citation

  • Chris Wallace, 2021. "A more accurate method for colocalisation analysis allowing for multiple causal variants," PLOS Genetics, Public Library of Science, vol. 17(9), pages 1-11, September.
  • Handle: RePEc:plo:pgen00:1009440
    DOI: 10.1371/journal.pgen.1009440
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    References listed on IDEAS

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    1. Claudia Giambartolomei & Damjan Vukcevic & Eric E Schadt & Lude Franke & Aroon D Hingorani & Chris Wallace & Vincent Plagnol, 2014. "Bayesian Test for Colocalisation between Pairs of Genetic Association Studies Using Summary Statistics," PLOS Genetics, Public Library of Science, vol. 10(5), pages 1-15, May.
    2. Jennifer L. Asimit & Daniel B. Rainbow & Mary D. Fortune & Nastasiya F. Grinberg & Linda S. Wicker & Chris Wallace, 2019. "Stochastic search and joint fine-mapping increases accuracy and identifies previously unreported associations in immune-mediated diseases," Nature Communications, Nature, vol. 10(1), pages 1-15, December.
    3. Yang Wu & Jian Zeng & Futao Zhang & Zhihong Zhu & Ting Qi & Zhili Zheng & Luke R. Lloyd-Jones & Riccardo E. Marioni & Nicholas G. Martin & Grant W. Montgomery & Ian J. Deary & Naomi R. Wray & Peter M., 2018. "Integrative analysis of omics summary data reveals putative mechanisms underlying complex traits," Nature Communications, Nature, vol. 9(1), pages 1-14, December.
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