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. 1985 Nov;37(6):1146–1163.

Genetic analysis of eight linked polymorphisms within the human immunoglobulin heavy-chain region.

N Migone, G de Lange, A Piazza, L L Cavalli-Sforza
PMCID: PMC1684735  PMID: 3936353

Abstract

Genetic analyses of multiple restriction fragment length polymorphisms, revealed by a single DNA probe containing the switch region of the immunoglobulin constant heavy-chain (IgCH) mu gene, are presented here in detail. Five of the polymorphic loci segregate in complete linkage with IgCH allotypic markers, while one appears to be located at more than 10 centimorgans from the IgCH region. A study of over 100 random haplotypes typed at eight linked loci, including the Ig switch polymorphisms and the classical Gm-Am allotypes, allowed us to construct an evolutionary tree by which each haplotypic variant can be derived one from the other either by single-step mutation or by recombination. A few of the recombinant haplotypes appeared to carry large DNA duplications that could be explained by unequal crossing over; others might postulate gene-conversion events. Linkage disequilibria observed between the IgCH-linked loci were compared with expected ones. A heterogeneous distribution of recombination rates is clearly documented, a "hot" region of recombination being present between the gamma 2 and switch alpha 2 loci.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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