An exonic polymorphism in the human glucose phosphate isomerase (GPI) gene

A polymorphic site has been found in the human glucose phosphate isomerase (GPI) gene. This site is produced by a A-->G substitution at nt 489 of GPI cDNA, resulting in a silent mutation. To our knowledge, it is the first defined polymorphism in the gene. It is present with similar gene frequencies in Asian, American White, African American, and Jewish populations.