The explosion of biobank data offers immediate opportunities for gene-environment (GxE) interaction studies of complex diseases because of the large sample sizes and rich collection in genetic and non-genetic information. However, the extremely large sample size also introduces new computational challenges in GxE assessment, especially for set-based GxE variance component (VC) tests, a widely used strategy to boost overall GxE signals and to evaluate the joint GxE effect of multiple variants from a biologically meaningful unit (e.g., gene).
We present SEAGLE, a Scalable Exact AlGorithm for Large-scale Set-based GxE tests, to permit GxE VC test scalable to biobank data. SEAGLE employs modern matrix computations to achieve the same “exact” results as the original GxE VC tests, and does not impose additional assumptions nor relies on approximations. SEAGLE can easily accommodate sample sizes in the order of
To install the latest stable version from CRAN:
install.packages('SEAGLE')
To install the latest development version from GitHub:
# install.packages("devtools")
devtools::install_github('jocelynchi/SEAGLE')
We've included four examples on how to use the SEAGLE
software.
- The first example shows how to use
SEAGLE
when the user inputs phenotype, covariate, and genotype data from .txt files. - The second example shows how to use
SEAGLE
when the user has a genetic marker matrix G that is already in matrix form. - The third example shows how to use
SEAGLE
when the user has genotype data from GWAS or next generation sequencing studies. - The fourth example shows how to use
SEAGLE
for chromosome-wide analysis when the user has genotype data from GWAS studies.
The accompanying journal manuscript for SEAGLE
can be found online here. To cite the SEAGLE
software, please use the following BibTeX entry.
@article{seagle,
author = {Jocelyn T. Chi and Ilse C. F. Ipsen and Tzu-Hung Hsiao and Ching-Heng Lin and Li-San Wang and Wan-Ping Lee and Tzu-Pin Lu and Jung-Ying Tzeng},
title = {SEAGLE: A Scalable Exact Algorithm for Large-Scale Set-Based Gene-Environment Interaction Tests in Biobank Data},
year = {2021},
arxiv = {https://arxiv.org/abs/2105.03228},
journal = {Frontiers in Genetics, section Statistical Genetics and Methodology},
volume = {12},
pages = {1878},
pdf = {https://www.frontiersin.org/articles/10.3389/fgene.2021.710055/pdf},
code = {http://jocelynchi.com/SEAGLE},
doi = {10.3389/fgene.2021.710055},
link = {https://www.frontiersin.org/articles/10.3389/fgene.2021.710055/full}
}
Many thanks to Yueyang Huang for his help with generating the example data and PLINK1.9 code for the tutorials.