To explore associations between SG13S114A/T and SG13S32A/C polymorphisms of ALOX5AP gene and the genetic susceptibility of ischemic cerebrovascular diseases (ICVD) in Henan Han population.

Two hundred and forty-six ICVD patients and 245 healthy controls were recruited from Han population in Henan province. Polymorphisms of SG13S114A/T and SG13S32A/C in ALOX5AP gene were genotyped in these samples by SnaPshot minisequencing method. Each genotype frequency and allele frequency were statistically analyzed and compared between ICVD group and control group using SPSS16.0 software. Haplotype and linkage disequilibrium were analyzed by SHEsis software.

The SG13S114 AA genotype frequency (18.7%) and A allele frequency (41.3%) in ICVD group were significantly higher than those in control group （9.0% and 32.7%, respectively; P=0.002 and P=0.005). It was also found that in male ICVD group and in younger ICVD group (<50 years old)，the SG13S114 AA genotype frequencies （22.1% and 22.0%, respectively) and A allele frequencies（42.1% and 42.7%, respectively） were significantly higher than those in male control group and younger control group (SG13S114 AA genotype: 9.0% and 8.9%; P=0.010 and P=0.006, respectively);A allele frequencies, 34.0% and 32.0%; P=0.048 and P=0.020, respectively. Finally, the prevalence of A-A haplotype in ICVD group was significantly higher than that in control group（30.4% vs 23.5％，OR＝1.419，95％ CI 1.068—1.885，P=0.015). T-C haplotype frequency of ICVD group was significantly lower than that in control group (22.0% vs 28.8%，OR＝0.698，95％CI 0.523—0.932，P=0.014).

The A allele in SG13S114 loci of ALOX5AP may be a genetic risk factor for ICVD in Han population in Henan province. The association is predominant in ICVD patients of male and younger than 50 years old. Maybe A-A haplotype increases the risk of ICVD and T-C haplotype and has a protective effect against ICVD in Henan Han population.

Brain ischemia; 5-Lipoxygenase-activating proteins; Polymerase chain reaction