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. 1991 Nov;49(5):917–931.

Nonuniform linkage disequilibrium within a 1,500-kb region of the human immunoglobulin heavy-chain complex.

M A Walter 1, D W Cox 1
PMCID: PMC1683260  PMID: 1928097

Abstract

We have characterized 10 VH polymorphic loci of the VH2, VH3, VH4, and VH5 families. Eight of 10 VH polymorphisms were found to be insertion/deletion polymorphisms, probably the result of nonhomologous recombination over the course of evolution of the current human VH repertoire. The 10 VH polymorphic loci were analyzed in 10 three-generation and 10 two-generation Canadian caucasoid families. Linkage disequilibrium (allelic association) was measured between pairs of VH polymorphic loci, and 12 significant associations were found. The degree of linkage disequilibrium measured between IGH polymorphic loci was then compared with the physical distance separating the loci. The physical distance between IGH polymorphic loci does not entirely determine the degree of linkage disequilibrium between polymorphic loci. Two regions, one in the VH region (between VH3f-2 and VH5-2 and one in the CH region (between C delta and C gamma 3), were found to have linkage disequilibrium values approximately 1/3,000 of that observed in other portions of the IGH region. The previous identification of recombinants in the C delta-to C gamma 3 region indicates that these areas of low linkage disequilibrium are consistent with the presence of recombination hot spots. The observed high amount of recombination in the subtelomeric portion of chromosome 14 therefore appears to be the result of specific hot spots for recombination, rather than a general increase in recombination in this region.

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Selected References

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