The Association Between Genetic Risk Factors and the Size of Intracranial Aneurysms at Time of Rupture
Neurosurgery - Current Issue
BACKGROUND:Genetic risk factors for intracranial aneurysms may influence the size of aneurysms. OBJECTIVE:To assess the association between genetic risk factors and the size of aneurysms at the time of rupture. METHODS:Genotypes of 7 independent single-nucleotide polymorphisms (SNPs) of the 6 genetic risk loci identified in genome-wide association studies of patients with intracranial aneurysms were obtained from 700 Dutch patients with an aneurysmal subarachnoid hemorrhage (1997-2007) previously genotyped in the genome-wide association studies; 255 additional Dutch patients with an aneurysmal subarachnoid hemorrhage (2007-2011) were genotyped for these SNPs. Aneurysms were measured on computerized tomography angiography or digital subtraction angiography. The mean aneurysm size (with standard error) was compared between patients with and without a genetic risk factor by the use of linear regression. The association between SNPs and size was assessed for single SNPs and for the combined effect of SNPs by using a weighted genetic risk score. RESULTS:Single SNPs showed no association with aneurysm size, nor did the genetic risk score. CONCLUSION:The 6 genetic risk loci have no major influence on the size of aneurysms at the time of rupture. Because these risk loci explain no more than 5% of the genetic risk, other genetic factors for intracranial aneurysms may influence aneurysm size and thereby proneness to rupture. ABBREVIATIONS:aSAH, aneurysmal subarachnoid hemorrhageCTA, computerized tomography angiogramDSA, digital subtraction angiogramGRS, genetic risk scoreGWAS, genome-wide association studiesSAH, subarachnoid hemorrhageSE, standard errorSNP, single-nucleotide polymorphismOriginal Article: http://journals.lww.com/neurosurgery/Fulltext/2013/10000/The_Association_Between_Genetic_Risk_Factors_and.26.aspx
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