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DNA "fingerprints" and segregation analysis of multiple markers in human pedigrees

By Alec J. Jeffreys, Victoria Wilson, Swee Lay Thein, David J. Weatherall and Bruce A.J. Ponder


© 1986 by the American Society of Human Genetics. Also available online from PubMed Central (http://www.pubmedcentral.nih.gov)Tandem-repetitive DNA hybridization probes based on a putative human recombination signal detect multiple polymorphic minisatellite fragments in human DNA. The genetic complexity of the resulting\ud individual-specific DNA "fingerprints" was investigated by studying a large sibship affected by neurofibromatosis and a more extensive pedigree segregating for two different hemoglobinopathies. The segregation\ud of up to 41 different heterozygous DNA fragments from each parent could be analyzed in a single sibship, using two different repeat probes. Most of these variable DNA fragments could not be paired as alleles, to an extent which suggests that the DNA fingerprints are together derived from ~ 60 heterozygous loci (~ 120 variable fragments),\ud only a proportion of which can be scored in a given individual. Two or three of the DNA fragments detected by one probe showed\ud tight linkage and may be derived from long minisatellite(s) that are cleaved to produce more than one polymorphic DNA fragment. Excluding allelic and linked DNA fragments, almost all remaining scorable fragments segregated independently, allowing up to 34 unlinked loci to be examined simultaneously. These loci are scattered over most or all of the human autosomes. Minisatellite probes are therefore suitable for rapid marker generation and can be applied to linkage\ud analysis in human pedigrees

Publisher: University of Chicago Press
Year: 1986
OAI identifier: oai:lra.le.ac.uk:2381/452

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