Abstract:
:NotI and EagI boundary libraries were constructed for human chromosome 21. One hundred forty-seven clones were isolated from the somatic cell hybrid 72532X-6 and localized using a hybrid mapping panel. After identification of those clones, which were isolated more than once, as well as those probes derived from a previously unrecognized integrated non-chromosome-21 fragment, 58 individual boundary clones (plus 2 additional NotI-EcoRI clones isolated from a flow-sorted library) were localized to 11 separate regions. The distribution of these probes is highly nonrandom, with 50% of the clones located in the distal band 21q22.3. Two probes, Not50 and Eag101, map to regions in the very proximal long arm which may contain the gene responsible for familial Alzheimer's disease (AD1), and Not50 would appear to be more proximal than D21S16 (E9). Twenty-eight probes map to the region between superoxide dismutase (SOD1) and the ETS2 oncogene, which appears to contain genes responsible for many of the phenotypic features of Down syndrome. Twenty clones contain (GT)n repeats, as determined by hybridization to a CA polymer, and should provide additional highly polymorphic probes. Closure of gaps in the physical linkage map of chromosome 21 should be facilitated by the isolation of these probes, as they identify many of the unmethylated CpG-rich islands that have hindered pulsed-field gel analysis. They will also be useful in identifying a set of genes in proximity to NotI and EagI restriction sites, as well as conserved DNA sequences for comparative mapping studies.
journal_name
Genomicsjournal_title
Genomicsauthors
Gao JZ,Erickson P,Patterson D,Jones C,Drabkin Hdoi
10.1016/0888-7543(91)90497-3subject
Has Abstractpub_date
1991-05-01 00:00:00pages
166-72issue
1eissn
0888-7543issn
1089-8646journal_volume
10pub_type
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