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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1985 Sep;82(18):6206–6210. doi: 10.1073/pnas.82.18.6206

A highly polymorphic locus in human DNA revealed by cosmid-derived probes.

M Litt, R L White
PMCID: PMC391021  PMID: 2994065

Abstract

Human gene mapping would be greatly facilitated if marker loci with sufficient heterozygosity were generally available. As a source of such markers, we have used cosmids from a human genomic library. We have developed a rapid method for screening random cosmids to identify those that are homologous to genomic regions especially rich in restriction fragment length polymorphisms. This method allows whole cosmids to be used as probes against Southern transfers of genomic DNA; regions of cosmid probes homologous to repeated genomic sequences are rendered unable to hybridize with Southern transfers by prehybridization of the probes with a vast excess of nonradioactive genomic DNA. From one cosmid identified by this procedure, we have isolated three single-copy probes that collectively identify seven polymorphic loci. Of 56 unrelated individuals, 52 were heterozygous at one or more of these marker loci.

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Selected References

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