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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1987 Dec;41(6):963–978.

Isolation and regional mapping of DNA sequences unique to human chromosome 21.

J R Korenberg 1, M L Croyle 1, D R Cox 1
PMCID: PMC1684349  PMID: 2891299

Abstract

To isolate DNA sequences unique to chromosome 21 we have used a recombinant-DNA library, constructed from a mouse-human somatic-cell hybrid line containing chromosome 21 as the only human chromosome. Individual recombinant phage containing human DNA inserts were identified by their hybridization to total human DNA sequences and by their failure to hybridize to total mouse DNA sequences. A repeat-free human DNA fragment was then subcloned from each of 14 such recombinant phage. An independent somatic-cell hybrid was used to assign all 14 subcloned fragments to chromosome 21. Thirteen of the fragments have been regionally mapped using a somatic-cell hybrid containing a human 21 translocation chromosome. Two probes map proximal to the 21q21.2 translocation breakpoint, and 11 probes map distal to this breakpoint, placing them in the region 21q21.2-21q22. One of seven probes used to screen for restriction-fragment-length polymorphisms recognized polymorphic DNA fragments when hybridized to genomic DNA from unrelated individuals. These 14 unique probes provide useful tools for studying the structure and function of human chromosome 21 as well as for investigating the molecular biology of Down syndrome.

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