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(Circulation. 2004;110:3727-3733.)
© 2004 American Heart Association, Inc.
Stroke |
From the Department of Health and Environmental Sciences (S.Y., M.U., K.I., S.I., A.K.) and the Department of Neurosurgery (S.Y., K.N., N.H.), Kyoto University Graduate School of Medicine, Kyoto, Japan; and the Department of Neurosurgery, Takayama Red Cross Hospital (K.T.), Gifu, Japan.
Correspondence to Dr Akio Koizumi, Department of Health and Environmental Sciences, Graduate School of Medicine Kyoto University, Konoe-cho, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan. E-mail koizumi{at}pbh.med.kyoto-u.ac.jp
Received May 20, 2004; revision received July 15, 2004; accepted August 2, 2004.
Background Genetic factors have an important role in the pathogenesis of intracranial aneurysm (IA). The results of previous studies have suggested several loci.
Methods and Results From 29 IA families with
3 individuals affected by IA, we used nonparametric (model-free) methods for linkage analyses, using GENEHUNTER and Merlin software. Genome-wide linkage analyses revealed 3 regions on chromosomes 17cen (maximum nonparametric logarithm of the odds score [MNS] = 3.00, nominal P=0.001), 19q13 (MNS=2.15, nominal P=0.020), and Xp22 (MNS=2.16, nominal P=0.019). We tested 4 candidate genes in these regions: the microfibril-associated protein 4 gene (MFAP4) and the promoter polymorphism of the inducible nitric oxide synthase gene (NOS2A) on chromosome 17cen, the epsilon genotypes of the apolipoprotein E gene (APOE) on chromosome 19q13, and the angiotensin I converting enzyme 2 gene (ACE2) on chromosome Xp22. Associations of their polymorphisms with IA were evaluated by a case-control study (100 cases: 29 probands from IA families and 71 unrelated subjects with IAs, 100 unrelated control subjects [unaffected members with IAs and absence of family history of IAs]). However, the case-control study showed that none of the polymorphisms of the examined genes had associations with IA.
Conclusions A genome-wide scan in 29 Japanese families with a high degree of familial clustering revealed 1 suggestive linkage region on chromosome 17cen and 2 potentially interesting regions on chromosomes 19q13 and Xp22. These regions were consistent with previous findings in various populations.
Key Words: aneurysm cerebrovascular disorders genes stroke
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