Cited by 394Genetic Associations and EpidemiologyGenetic and phenotypic traits in livestockGenetic Mapping and Diversity in Plants and Animals

Distinguishing genetic correlation from causation across 52 diseases and complex traits

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O’Connor, Luke J., Price, Alkes L.·2018·Nature Genetics

Published version of a preprint

Abstract

Mendelian randomization, a method to infer causal relationships, is confounded by genetic correlations reflecting shared etiology. We developed a model in which a latent causal variable mediates the genetic correlation; trait 1 is partially genetically causal for trait 2 if it is strongly genetically correlated with the latent causal variable, quantified using the genetic causality proportion. We fit this model using mixed fourth moments [Formula: see text] and [Formula: see text] of marginal effect sizes for each trait; if trait 1 is causal for trait 2, then SNPs affecting trait 1 (large [Formula: see text]) will have correlated effects on trait 2 (large α 1 α 2), but not vice versa. In simulations, our method avoided false positives due to genetic correlations, unlike Mendelian randomization. Across 52 traits (average n = 331,000), we identified 30 causal relationships with high genetic causality proportion estimates. Novel findings included a causal effect of low-density lipoprotein on bone mineral density, consistent with clinical trials of statins in osteoporosis.

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Authors
O’Connor, L. J., & Price, A. L.
Affiliations
  • Harvard University (US)
  • Broad Institute (US)
Corresponding author
  • O’Connor, Luke J.
  • Price, Alkes L.
Venue
Nature Genetics
Published
2018-10-29
Volume
50
Issue
12
Pages
1728-1734
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W2950958620
Cited by
394
References
78
Citations by year
2026: 27 · 2025: 42 · 2024: 85 · 2023: 50 · 2022: 53 · 2021: 53 · 2020: 39 · 2019: 35 · 2018: 9 · 2017: 1
FWCI
20.52
Type
journal article
Language
en
Open access
Locations
  • Nature Genetics (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (16549, CA194393, MH107649)
  • National Institute of Mental Health (R01MH107649, R01MH101244)
  • National Human Genome Research Institute (T32HG002295)
  • National Cancer Institute (U01CA194393)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
Keywords
genetic correlation, genetic causality, shared etiology, complex traits, disease characteristics, low-density lipoprotein, bone mineral density, statins, osteoporosis, causal inference
MeSH terms
Autistic Disorder, Computer Simulation, Disease, Genotype, Humans, Hypothyroidism, Models, Theoretical, Myocardial Infarction, Osteoporosis, Phenotype, Bone Density, Linkage Disequilibrium, Causality, Genetic Predisposition to Disease, Multifactorial Inheritance, Polymorphism, Single Nucleotide

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