Matrix metalloproteinase-1 (MMP-1) is a member of the matrix metalloproteinase enzyme family that degrades components of the extracellular matrix. Recent studies have demonstrated several polymorphic sites in the promoter of the MMP-1 gene. A newly identified single nucleotide polymorphism (SNP) at position -519 in the promoter region of the MMP-1 gene is reported. This polymorphism consists in a guanine to adenine substitution. A linkage between polymorphisms -519A/G and -1607 1G/2G was also studied.