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Statistical Applications in Genetics and Molecular Biology

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Volume 14, Issue 3 (Jun 2015)

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Modeling gene-covariate interactions in sparse regression with group structure for genome-wide association studies

Yun Li
  • Corresponding author
  • Department of Mathematics and Statistics, Boston University, MA 02215, USA
  • Department of Biostatistics, Boston University School of Public Health, MA 02118, USA
  • Email
  • Other articles by this author:
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/ George T. O’Connor / Josée Dupuis / Eric Kolaczyk
Published Online: 2015-05-01 | DOI: https://doi.org/10.1515/sagmb-2014-0073

Abstract

In genome-wide association studies (GWAS), it is of interest to identify genetic variants associated with phenotypes. For a given phenotype, the associated genetic variants are usually a sparse subset of all possible variants. Traditional Lasso-type estimation methods can therefore be used to detect important genes. But the relationship between genotypes at one variant and a phenotype may be influenced by other variables, such as sex and life style. Hence it is important to be able to incorporate gene-covariate interactions into the sparse regression model. In addition, because there is biological knowledge on the manner in which genes work together in structured groups, it is desirable to incorporate this information as well. In this paper, we present a novel sparse regression methodology for gene-covariate models in association studies that not only allows such interactions but also considers biological group structure. Simulation results show that our method substantially outperforms another method, in which interaction is considered, but group structure is ignored. Application to data on total plasma immunoglobulin E (IgE) concentrations in the Framingham Heart Study (FHS), using sex and smoking status as covariates, yields several potentially interesting gene-covariate interactions.

Keywords: gene-environment/covariate interaction; genome-wide association studies; sparse regression

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About the article

Corresponding author: Yun Li, Department of Mathematics and Statistics, Boston University, MA 02215, USA; and Department of Biostatistics, Boston University School of Public Health, MA 02118, USA, e-mail:


Published Online: 2015-05-01

Published in Print: 2015-06-01


Citation Information: Statistical Applications in Genetics and Molecular Biology, ISSN (Online) 1544-6115, ISSN (Print) 2194-6302, DOI: https://doi.org/10.1515/sagmb-2014-0073.

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