title: Association of kallikrein gene polymorphisms with intracranial aneurysms.
abstract: OBJECTIVE
  Genomewide DNA linkage analysis identified a susceptibility locus for intracranial aneurysm (IA) on chromosome 19q13 in the Finnish population, a region including the kallikrein gene cluster. We investigated the association of single nucleotide polymorphisms (SNPs) in the kallikrein gene cluster with IA in the Finnish population.
  
  
  METHODS
  We genotyped 18 haplotype-tagging SNPs spanning a 244 kbp region in the kallikrein gene cluster for 266 Finnish IA cases and 290 Finnish control subjects. In a second phase, we genotyped 2 SNPs (rs1722561 and rs1701946) in an additional set of 102 Finnish IA cases and 102 Finnish control subjects; and in a third phase, we genotyped these 2 SNPs in 156 Russian IA cases and 186 Russian control subjects. Both single-marker and haplotype-based tests of association were performed.
  
  
  RESULTS
  In phase I, SNPs rs1722561 and rs1701946 were significantly associated with IA in the Finnish population for single locus models (rs1722561: P=0.0395; rs1701946: P=0.0253). A 2-SNP haplotype block (rs1722561-rs1701946) identified in phase I was also associated with IA in the expanded Finnish (phase II) data set (asymptotic P=0.012; empirical P=0.019). In the Finnish and Russian combined data set (phase III) with 524 cases and 578 control subjects, the same 2 SNPs (OR: 1.35, 95% CI: 1.14, 1.60; P=0.0005 for rs1722561 and OR: 1.32, 95% CI: 1.12, 1.57; P=0.0011 for rs1701946) were significantly associated with IA. These SNPs are located in the intronic region of KLK8, although linkage disequilibrium could extend from rs268912-rs2250066, a approximately 76-kbp region that includes KLK5-KLK10.
  
  
  CONCLUSIONS
  Polymorphisms within the kallikrein gene cluster are associated with IA suggesting that the kallikreins are important candidate genes for IA.
authors.affiliation: Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, 3309 Gordon H. Scott Hall of Basic Medical Sciences, 540 East Canfield Avenue, Detroit, MI 48201, USA.
authors.forename: Shantel
authors.initials: S
authors.lastname: Weinsheimer
authors.forename: Katrina A B
authors.initials: KA
authors.lastname: Goddard
authors.forename: Antonio R
authors.initials: AR
authors.lastname: Parrado
authors.forename: Qing
authors.initials: Q
authors.lastname: Lu
authors.forename: Moumita
authors.initials: M
authors.lastname: Sinha
authors.forename: Elena R
authors.initials: ER
authors.lastname: Lebedeva
authors.forename: Antti
authors.initials: A
authors.lastname: Ronkainen
authors.forename: Mika
authors.initials: M
authors.lastname: Niemelä
authors.forename: Elza K
authors.initials: EK
authors.lastname: Khusnutdinova
authors.forename: Rita I
authors.initials: RI
authors.lastname: Khusainova
authors.forename: Katariina
authors.initials: K
authors.lastname: Helin
authors.forename: Juha E
authors.initials: JE
authors.lastname: Jääskeläinen
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Sakovich
authors.forename: Susan
authors.initials: S
authors.lastname: Land
authors.forename: Helena
authors.initials: H
authors.lastname: Kuivaniemi
authors.forename: Gerard
authors.initials: G
authors.lastname: Tromp
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D005260:Female; D005387:Finland; D005819:Genetic Markers; D015894:Genome, Human; D006239:Haplotypes; D006801:Humans; D002532:Intracranial Aneurysm / Q000235:genetics*; D007610:Kallikreins / Q000235:genetics*; D015810:Linkage Disequilibrium; D008297:Male; D008875:Middle Aged; D005810:Multigene Family / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D012426:Russia
chemical_list: D005819:Genetic Markers; D007610:Kallikreins