Journal Article

Bivariate genetic association of <i>KIAA1797</i> with heart rate in American Indians: the Strong Heart Family Study

Phillip E. Melton, Sue Rutherford, Venkata Saroja Voruganti, Harald H.H. Göring, Sandra Laston, Karin Haack, Anthony G. Comuzzie, Thomas D. Dyer, Matthew P. Johnson, Jack W. Kent, Joanne E. Curran, Eric K. Moses, John Blangero, Ana Barac, Elisa T. Lee, Lyle G. Best, Richard R. Fabsitz, Richard B. Devereux, Peter M. Okin, Jonathan N. Bella, Uli Broeckel, Barbara V. Howard, Jean W. MacCluer, Shelley A. Cole and Laura Almasy

in Human Molecular Genetics

Volume 19, issue 18, pages 3662-3671
Published in print September 2010 | ISSN: 0964-6906
Published online July 2010 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddq274
Bivariate genetic association of KIAA1797 with heart rate in American Indians: the Strong Heart Family Study

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Heart rate (HR) has been identified as a risk factor for cardiovascular disease (CVD), yet little is known regarding genetic factors influencing this phenotype. Previous research in American Indians (AIs) from the Strong Heart Family Study (SHFS) identified a significant quantitative trait locus (QTL) for HR on chromosome 9p21. Genetic association on HR was conducted in the SHFS. HR was measured from electrocardiogram (ECG) and echocardiograph (Echo) Doppler recordings. We examined 2248 single-nucleotide polymorphisms (SNPs) on chromosome 9p21 for association using a gene-centric statistical test. We replicated the aforementioned QTL [logarithm of odds (LOD) = 4.83; genome-wide P= 0.0003] on chromosome 9p21 in one SHFS population using joint linkage of ECG and Echo HR. After correcting for effective number of SNPs using a gene-centric test, six SNPs (rs7875153, rs7848524, rs4446809, rs10964759, rs1125488 and rs7853123) remained significant. We applied a novel bivariate association method, which was a joint test of association of a single locus to two traits using a standard additive genetic model. The SNP, rs7875153, provided the strongest evidence for association (P = 7.14 × 10−6). This SNP (rs7875153) is rare (minor allele frequency = 0.02) in AIs and is located within intron 9 of the gene KIAA1797. To support this association, we applied lymphocyte RNA expression data from the San Antonio Family Heart Study, a longitudinal study of CVD in Mexican Americans. Expression levels of KIAA1797 were significantly associated (P = 0.012) with HR. These findings in independent populations support that KIAA1797 genetic variation may be associated with HR but elucidation of a functional relationship requires additional study.

Journal Article.  6426 words.  Illustrated.

Subjects: Genetics and Genomics

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