The DNA. sequence of the human IFN-gamma gene shows the presence of a varia
ble-length CA repeat in the first intron of the gene. We investigated the a
llele distribution of this microsatellite region in 164 unrelated healthy i
ndividuals, and the association with interferon-gamma (IFN-gamma) productio
n. In vitro production of IFN-gamma showed a significant correlation with t
he presence of allele #2.