Isolation and characterization of cloned human fetal globin genes

Three clones containing both the human Gγand Aγ globin genes have been isolated and characterized from a library of DNA fragments generated by partial Eco RI digestion of cellular DNA using charon 4A phage as vector. Two of the clones (NY 2 and 3) are identical and have an insert of 14.0 kb. The third clone (NY 1) has a 15.4 kb insert by virtue of an extra 1.4 kb Eco RI fragment at its 5′ most end. This clone also has a Kpn I site not present in the other two suggesting it is the product of the γ gene on the opposite chromosome. Restriction analysis of the three clones indicates that the Gγ and Aγ genes are linked on a single continuous piece of DNA and are separated by 3.5 kb and each contains at least one large intervening sequence of 0.85 kb between the Bam HI and Eco RI sites. These findings in cloned DNA provide direct evidence for linkage and organization of the γ genes in man.