title: Blood group antigen loci demonstrate multivariate genetic associations with circulating cellular adhesion protein levels in the Multi-Ethnic Study of Atherosclerosis.
abstract: The cellular adhesion pathway is critical in the pathophysiology of atherosclerosis, and genetic factors contributing to regulation of circulating levels of related proteins may be relevant to risk prediction of cardiovascular disease. In contrast to conducting separate genome-wide protein quantitative trait loci (pQTL) mapping analyses of each individual protein, joint genetic association analyses of multiple quantitative traits can leverage cross-trait co-variation and identify simultaneous regulatory effects on protein levels across the pathway. We conducted a multi-pQTL (mpQTL) analysis of 15 proteins related to cellular adhesion assayed on 2313 participants from the Multi-Ethnic Study of Atherosclerosis (MESA). We applied the MQFAM multivariate association analysis method in PLINK on normalized protein level residuals derived from univariate linear regression, adjusting for age, sex, and principal components of ancestry. Race/ethnicity-stratified analyses identified nine genome-wide significant (P < 5e-08) loci associated with co-variation of protein levels. Although the majority of these SNPs were in proximity to structural genes of the assayed proteins, we discovered multiple loci demonstrating co-association with the circulation of at least two proteins. Of these, two significant loci specific to non-Hispanic white participants, rs17074898 at ALOX5AP (P = 1.78E-08) and rs7521237 at KIAA1614 (P = 2.2E-08), would not have met statistical significance using univariate analyses. Moreover, common patterns of multi-protein associations were discovered at the ABO locus across race/ethnicity. These results indicate the biological relevance of blood group antigens on regulation of circulating cellular adhesion pathway proteins while also demonstrating race/ethnicity-specific co-regulatory effects.
authors.affiliation: Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA. Larson.nicholas@mayo.edu.
authors.forename: Nicholas B
authors.identifier: http://orcid.org/0000-0002-3468-4215
authors.initials: NB
authors.lastname: Larson
authors.affiliation: Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Decker
authors.affiliation: Department Pathology and Laboratory Medicine, College of Medicine, University of Vermont, Burlington, VT, USA.
authors.forename: Christina L
authors.initials: CL
authors.lastname: Wassel
authors.affiliation: Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN, USA.
authors.forename: James S
authors.initials: JS
authors.lastname: Pankow
authors.affiliation: Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Weihong
authors.initials: W
authors.lastname: Tang
authors.affiliation: Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Naomi Q
authors.initials: NQ
authors.lastname: Hanson
authors.affiliation: Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Michael Y
authors.initials: MY
authors.lastname: Tsai
authors.affiliation: Division of Epidemiology, Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA.
authors.forename: Suzette J
authors.initials: SJ
authors.lastname: Bielinski
mesh_terms: D000941:Antigens / Q000235:genetics / Q000276:immunology*; D050197:Atherosclerosis / Q000097:blood*; D001789:Blood Group Antigens / Q000276:immunology*; D015815:Cell Adhesion Molecules / Q000097:blood*; D005006:Ethnicity; D006801:Humans
chemical_list: D000941:Antigens; D001789:Blood Group Antigens; D015815:Cell Adhesion Molecules