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. 2011 Oct;42(10):2726-32.
doi: 10.1161/STROKEAHA.111.620484. Epub 2011 Sep 22.

Siblings with ischemic stroke study: results of a genome-wide scan for stroke loci

James F Meschia  1 , Michael Nalls, Mar Matarin, Thomas G Brott, Robert D Brown Jr, John Hardy, Brett Kissela, Stephen S Rich, Andrew Singleton, Dena Hernandez, Luigi Ferrucci, Kerra Pearce, Margaret Keller, Bradford B Worrall; Siblings With Ischemic Stroke Study Investigators
Collaborators, Affiliations

Siblings with ischemic stroke study: results of a genome-wide scan for stroke loci

James F Meschia et al. Stroke. 2011 Oct.

Erratum in

  • Stroke. 2013 Sep;44(9):e117

Abstract

Background and purpose: Ischemic stroke has a strong familial component to risk. The Siblings With Ischemic Stroke Study (SWISS) is a genome-wide, family-based analysis that included use of imputed genotypes. The Siblings With Ischemic Stroke Study was conducted to examine the associations between single-nucleotide polymorphisms (SNPs) and risk of stroke and stroke subtypes within pairs.

Methods: The Siblings With Ischemic Stroke Study enrolled 312 probands with ischemic stroke from 70 US and Canadian centers. Affected siblings were ascertained by centers and confirmed by central record review; unaffected siblings were ascertained by telephone contact. Ischemic stroke was subtyped according to Trial of Org 10172 in Acute Stroke Treatment criteria. Genotyping was performed with an Illumina 610 quad array (probands) and an Illumina linkage V array (affected siblings). SNPs were imputed by using 1000 Genomes Project data and MACH software. Family-based association analyses were conducted by using the sibling transmission-disequilibrium test.

Results: For all pairs, the correlation of age at stroke within pairs of affected siblings was r=0.83 (95% CI, 0.78-0.86; P<2.2×10(-16)). The correlation did not differ substantially by subtype. The concordance of stroke subtypes among affected pairs was 33.8% (kappa=0.13; P=5.06×10(-4)) and did not differ by age at stroke in the proband. Although no SNP achieved genome-wide significance for risk of ischemic stroke, there was clustering of the most associated SNPs on chromosomes 3p (neuronal nitric oxide synthase) and 6p.

Conclusions: Stroke subtype and age at stroke in affected sibling pairs exhibit significant clustering. No individual SNP reached genome-wide significance. However, 2 promising candidate loci were identified, including 1 that contains neuronal nitric oxide synthase, although these risk loci warrant further examination in larger sample collections.

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Conflict of interest statement

Conflicts of Interest/Disclosure

The funding source had no involvement in study design beyond peer review of the grant. The funding source had no involvement in collection, analysis, or interpretation of data; in writing of the report; or in the decision to submit the article for publication.

Figures

Figure 1
Figure 1
Flow of participants in the study.
Figure 2
Figure 2
Correlation between proband and sibling age at stroke. Correlation coefficient = 0.83. P-value < 0.0001. Pairs are points, Blue line = linear model, grey shading = 95% CI.
Figure 3
Figure 3
Summary of transmission-disequilibrium test results. All SNPs within 2.5 megabases of SNPs shown in table 1 are highlighted in blue.
See this image and copyright information in PMC

Comment in

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