This study was undertaken to investigate a means of assigning Gm allotypes to Caucasians by RFLP analysis. A single immunoglobulin heavy-chain gamma-4 cDNA probe (HU gamma 4) was hybridized with genomic DNA digested separately with two restriction enzymes, TaqI and PvuII. Results showed excellent correlation (P less than .001) between serologically defined Gm allotypes G1m(1), G1m(2), G2m(23), and G1m;G3m (3;5,10) and RFLPs identified with the (HU gamma 4) probe. We conclude that it is now possible to define common Gm haplotypes in Caucasians by RFLP analysis. This method provides a useful adjunct to serological allotyping and indeed has several important advantages over traditional serology: it allows confident Gm assignment and the definition of homozygous and heterozygous Gm arrangements, is highly reproducible, and is readily executed in any molecular genetic laboratory.
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