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Approximately 70 percent of the mutations in cystic fibrosis patients correspond to a specific deletion of three base pairs, which results in the loss of a phenylalanine residue at amino acid position 508 of the putative product of the cystic fibrosis gene. Extended haplotype data based on DNA markers closely linked to the putative disease gene locus(More)
We report the cloning, sequencing, and mapping of three short sequence repeat polymorphisms due to tetranucleotide (TAAA)n repeats from human chromosome 21. These DNA markers (D21S221, D21S225, D21S226) have been cloned from the chromosome 21-specific plasmid library of J. C. Fuscoe, C. C. Collins, D. Pinkel, and J. W. Gray (1989, Genomics 5: 100-109) and(More)
A plasmid, AWZ1, that contained a dinucleotide (GT)n repeat was identified from a chromosome 21-specific genomic library. When amplified by PCR from human genomic DNA, the repeat length was highly polymorphic between individuals; its location, D21S215, was mapped in the CEPH pedigrees by linkage analysis to the pericentromeric region of chromosome 21. It is(More)
Nondisjunction in trisomy 21 has traditionally been studied by cytogenetic heteromorphisms. Those studies assumed no crossing-over on the short arm of chromosome 21. Recently, increased accuracy of detection of the origin of nondisjunction has been demonstrated by DNA polymorphism analysis. We describe a comparative study of cytogenetic heteromorphisms and(More)
We used single-strand conformation polymorphism (SSCP) to detect DNA polymorphisms in the 3′ untranslated (3′UT) region of the gene for cystathionine β-synthase (CBS). A polymorphism due to a T-to-C substitution at nucleotide 549 of the 3′UT region with heterozygosity of 46% has been identified. Genotypes for this polymorphism have been obtained in all of(More)
A DNA polymorphism has been found in the 3' untranslated region of the carbonyl reductase gene (CBR). Genotypes of the members of the CEPH pedigrees have been obtained and used in linkage analysis to map the CBR gene in the linkage map of human chromosome 21. The gene maps between the interferon-alpha receptor (IFNAR) and the D21S55 loci.
We have detected a polymorphism in the 3' untranslated region of the AML1 gene, which is located at the breakpoint on chromosome 21 in the t(8;21)(q22;q22.3) translocation often associated with patients with acute myeloid leukemia. Informative CEPH families were genotyped for this polymorphism and used to localize the gene on the linkage map of human(More)
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