Cited by 4,261Genetic Associations and EpidemiologyGenetic Mapping and Diversity in Plants and AnimalsGenetic and phenotypic traits in livestock

Bayesian Test for Colocalisation between Pairs of Genetic Association Studies Using Summary Statistics

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Giambartolomei, Claudia, Vukcevic, Damjan, Schadt, Eric E., Franke, Lude, Hingorani, Aroon D., Wallace, Chris, Plagnol, Vincent·2014·PLoS Genetics

Abstract

Genetic association studies, in particular the genome-wide association study (GWAS) design, have provided a wealth of novel insights into the aetiology of a wide range of human diseases and traits, in particular cardiovascular diseases and lipid biomarkers. The next challenge consists of understanding the molecular basis of these associations. The integration of multiple association datasets, including gene expression datasets, can contribute to this goal. We have developed a novel statistical methodology to assess whether two association signals are consistent with a shared causal variant. An application is the integration of disease scans with expression quantitative trait locus (eQTL) studies, but any pair of GWAS datasets can be integrated in this framework. We demonstrate the value of the approach by re-analysing a gene expression dataset in 966 liver samples with a published meta-analysis of lipid traits including >100,000 individuals of European ancestry. Combining all lipid biomarkers, our re-analysis supported 26 out of 38 reported colocalisation results with eQTLs and identified 14 new colocalisation results, hence highlighting the value of a formal statistical test. In three cases of reported eQTL-lipid pairs (SYPL2, IFT172, TBKBP1) for which our analysis suggests that the eQTL pattern is not consistent with the lipid association, we identify alternative colocalisation results with SORT1, GCKR, and KPNB1, indicating that these genes are more likely to be causal in these genomic intervals. A key feature of the method is the ability to derive the output statistics from single SNP summary statistics, hence making it possible to perform systematic meta-analysis type comparisons across multiple GWAS datasets (implemented online at http://coloc.cs.ucl.ac.uk/coloc/). Our methodology provides information about candidate causal genes in associated intervals and has direct implications for the understanding of complex diseases as well as the design of drugs to target disease pathways.

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Crossref · 10.1371/journal.pgen.1004383

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  • The presence of multiple associated variants in a region violates the assumptions of COLOC and can lead to false positives or false negatives.

    “because the presence of multiple associated variants in a region violates the assumptions of COLOC and can lead to false positives or false negatives [13].”

    From Multi-trait association studies discover pleiotropic loci between Alzheimer’s disease and cardiometabolic traits (2021) · cites this paper as [13]

    The Results sections on several independent associations and on comparison with existing tests state that COLOC assumes at most one causal variant per trait per locus, and that multiple signals can affect PP4 or give strong support to either H3 or H4. They do not establish both false positives and false negatives as stated: the paper cautions that high PP4 in this setting supports ‘at least one causal variant’ being shared, while weaker secondary signals have negligible impact. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Colocalization analysis used a strict Bayesian model with the coloc package in R.

    “To estimate the prior likelihood of each genomic locus having a single variant affecting both the protein and the phenotype, we used a strict Bayesian model (colocalization analysis) using the coloc package in R (Giambartolomei et al, 2014).”

    From The genetic regulation of protein expression in cerebrospinal fluid (2023) · cites this paper as Giambartolomei et al, 2014

  • After exclusion of pleiotropic regions, 32 proteins had QTL that colocalized with AD risk (PP.H4>0.8).

    “Finally, we assessed colocalization48,49 between each of our 2,477 significant pQTL associations (cis and trans) and the AD GWAS. After exclusion of pleiotropic regions, 32 proteins had QTL that colocalized with AD risk (PP.H4>0.8, Fig. 4A, Supp. Tables S43&44).”
  • SPI1, MS4A4A, MS4A6A, and SELL are specifically expressed in microglia based on RNA-Seq data.

    “Further, SPI1, MS4A4A, MS4A6A, and SELL are specifically expressed in microglia based on RNA-Seq data29–31”

    From A common haplotype lowers PU.1 expression in myeloid cells and delays onset of Alzheimer's disease (2017) · cites this paper as [31]

    The Materials and Methods section (Expression dataset; page unavailable) describes gene-expression arrays from human liver samples, not microglial RNA-Seq. Searches for SPI1, MS4A4A, MS4A6A, SELL, and microglial RNA-Seq found no passage in our copy addressing the claimed cell-specific expression. (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • No evidence of colocalization between miR-QTLs and host gene eQTLs was found for 89 of 106 miRNA-host pairs.

    “Considering the 106 miRNA-host pairs (103 mature miRNAs from 77 precursors in 71 host genes) for which the miRNA had miR-QTLs and the host gene had eQTLs, we found evidence of colocalization between miR-QTLs and host gene eQTLs (coloc PP.H4 > 0.5) for 17 pairs and no evidence of colocalization for 89 pairs (Supplementary Table 9).”

    From Mapping the microRNA landscape in the older adult brain and its genetic contribution to neuropsychiatric conditions (2024) · cites this paper as [20]

    The Materials and Methods (eQTL analysis; page unavailable) describes the paper’s colocalisation procedure, while the Results report analyses of lipid traits and liver eQTLs. A search for miR-QTLs, miRNA-host pairs, and the 89-of-106 result found no passage addressing that finding. (LLM, conf=0.76)

    Experimental — accuracy not yet measured

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Authors
Giambartolomei, C., Vukcevic, D., Schadt, E. E., Franke, L., Hingorani, A. D., Wallace, C., & Plagnol, V.
Affiliations
  • University College London (GB)
  • Royal Children's Hospital (AU)
  • Icahn School of Medicine at Mount Sinai (US)
  • University Medical Center Groningen (NL)
  • University of Cambridge (GB)
Corresponding author
Giambartolomei, Claudia
Venue
PLoS Genetics
Published
2014-05-15
Volume
10
Issue
5
Pages
e1004383
ISSN
  • 1553-7390 (ISSN-L)
  • 1553-7404
OpenAlex
W2073836327
Cited by
4,261
References
68
Citations by year
2026: 797 · 2025: 949 · 2024: 871 · 2023: 441 · 2022: 343 · 2021: 323 · 2020: 195 · 2019: 120 · 2018: 105 · 2017: 59 · 2016: 30 · 2015: 20 · 2014: 4
FWCI
4.99
Type
journal article
Language
en
Open access
Locations
  • PLoS Genetics (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (publishedVersion, cc-by)
  • arXiv (Cornell University) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by)
  • Apollo (University of Cambridge) (submittedVersion, cc-by)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, cc-by)
  • arXiv (Cornell University)
  • Apollo (cc-by)
Funders
  • Wellcome Trust (091157, 089989, 100140, 091157/Z/10/Z, 100140/Z/12/Z, 091157/Z/10/B, 089989/Z/09/Z)
  • National Institute for Health and Care Research
  • British Heart Foundation
  • Moorfields Eye Hospital NHS Foundation Trust
  • Medical Research Council (MR/K006584/1)
  • Cambridge Institute for Medical Research, University of Cambridge (100140)
  • NIHR Cambridge Biomedical Research Centre
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 and phenotypic traits in livestock
Keywords
genetic association summary statistics, expression quantitative trait loci, lipid biomarkers, hepatic gene expression, causal variant identification, SORT1, GCKR, KPNB1, cardiovascular genetics
MeSH terms
Bayes Theorem, Humans, Sample Size, Genome-Wide Association Study

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