A novel polymorphic site has been found in the 3' untranslated region (UTR)
of the human complement component 7 (C7) gene. The polymorphic site at 14-
bp downstream from the TAG stop codon was either C or A (Nco I-digested), w
ith allele frequencies of 0.660 and 0.340. This NcoI polymorphism would be
useful to perform a DNA marker haplotype study in patients with deficiencie
s of the complement genes, such as C6, C7, C9, which are located closely on
chromosome 5p13.