To investigate the association of single nucleotide polymorphism in the matrix metalloproteinase-3 (MMP3) gene promoter with the susceptibility to the middle cerebral artery stenosis. A case-control study was performed by determining the genotype of MMP3 gene promoter region using polymerase chain reaction-restriction fragment length polymorphism in 119 patients with middle cerebral artery stenosis documented by transcranial Doppler compared to 92 control patients. The frequencies of 5A and 6A alleles in MMP3 promoter region were 16.0 and 84.0% respectively in case group compared to 15.8 and 84.2% in control group with no significant difference between the two groups (P > 0.05). No significant difference was also observed in the distribution of genotypes 5A/5A,5A/6A, and 6A/6A between middle cerebral artery stenosis and control groups. Compared to 5A/5A + 5A/6A genotypes,the 6A/6A genotype did not significantly modify the risk of developing the middle cerebral artery stenosis. The MMP3-1171 dupA promoter polymorphisms are not valuable markers of susceptibility of the middle cerebral artery stenosis in this sample of population studied.
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