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Common mitochondrial sequence variants in ischemic stroke
Author(s) -
Anderson Christopher D.,
Biffi Alessandro,
Rahman Rosanna,
Ross Owen A.,
Jagiella Jeremiasz M.,
Kissela Brett,
Cole John W.,
Cortellini Lynelle,
Rost Natalia S.,
Cheng YuChing,
Greenberg Steven M.,
de Bakker Paul I.W.,
Brown Robert D.,
Brott Thomas G.,
Mitchell Braxton D.,
Broderick Joseph P.,
Worrall Bradford B.,
Furie Karen L.,
Kittner Steven J.,
Woo Daniel,
Slowik Agnieszka,
Meschia James F.,
Saxena Richa,
Rosand Jonathan
Publication year - 2011
Publication title -
annals of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.764
H-Index - 296
eISSN - 1531-8249
pISSN - 0364-5134
DOI - 10.1002/ana.22108
Subject(s) - genome wide association study , single nucleotide polymorphism , genetic association , stroke (engine) , odds ratio , medicine , snp , bioinformatics , genetics , biology , genotype , gene , mechanical engineering , engineering
Objective Rare mitochondrial mutations cause neurologic disease, including ischemic stroke and MRI white matter changes. We investigated whether common mitochondrial genetic variants influence risk of sporadic ischemic stroke and, in patients with stroke, the volume of white matter hyperintensity (WMHV). Methods In this multicenter, mitochondrial genome‐wide association study (GWAS), 2284 ischemic stroke cases and 1728 controls from the International Stroke Genetics Consortium were genotyped for 64 mitochondrial single nucleotide polymorphisms (SNPs). Imputation resulted in 144 SNPs, which were tested in each cohort and in meta‐analysis for ischemic stroke association. A genetic score of all mitochondrial variants was also tested in association with ischemic stroke. Results No individual SNP reached adjusted significance in meta‐analysis. A genetic score comprised of the summation of contributions from individual variants across the mitochondrial genome showed association with ischemic stroke in meta‐analysis (odds ratio [OR] = 1.13, p < 0.0001) with minimal heterogeneity (I 2 = 0.00). This ischemic stroke score was robust to permutation, and was also associated with WMHV in 792 nested case individuals with ischemic stroke ( p = 0.037). Interpretation In this mitochondrial GWAS of ischemic stroke, a genetic score comprised of the sum of all common variants in the mitochondrial genome showed association with ischemic stroke. In an independent analysis of a related trait, this same score correlated with WMHV in stroke cases. Despite this aggregate association, no individual variant reached significance. Substantially larger studies will be required to identify precise sequence variants influencing cerebrovascular disease.ANN NEUROL 2010;00:000–000