Polymorphisms of the immunoglobulin heavy-chain delta gene and association with other constant-region genes - PubMed (original) (raw)

Polymorphisms of the immunoglobulin heavy-chain delta gene and association with other constant-region genes

J C Benger et al. Am J Hum Genet. 1989 Oct.

Abstract

Polymorphisms have previously been reported for the C mu, C alpha, C epsilon, and C gamma genes of the immunoglobulin heavy-chain (IGH) gene cluster. Here we report polymorphisms of the IGH C delta gene region, observed using the enzymes ApaI, AvaII, TaqI, and XbaI. The TaqI and XbaI polymorphisms were used in an investigation of linkage disequilibrium throughout the cluster of constant-region genes. The TaqI polymorphism, located 5' to the C delta gene, is in linkage disequilibrium with a polymorphism of the C mu switch region. The XbaI polymorphism, which is in the vicinity of the C delta 2 exon, is not strongly associated with any other polymorphisms, including the TaqI polymorphism and the Gm polymorphism of C gamma 3. Although there is a high degree of association between most genes of the IGH region, there is a lack of association between C delta and C gamma 3, which may indicate a hot spot for recombination.

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