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|Title:||FRA10B structure reveals common elements in repeat expansion and chromosomal fragile site genesis|
|Citation:||Molecular Cell, 1998; 1(6):773-781|
|Duncan R Hewett, Oliva Handt, Lynne Hobson, Marie Mangelsdorf, Helen J Eyre, Elizabeth Baker, Grant R Sutherland, Simone Schuffenhauer, Jen-i Mao and Robert I Richards.|
|Abstract:||A common mechanism for chromosomal fragile site genesis is not yet apparent. Folate-sensitive fragile sites are expanded p(CCG)n repeats that arise from longer normal alleles. Distamycin A or bromodeoxyuridine-inducible fragile site FRA16B is an expanded AT-rich 33 bp repeat; however, the relationship between normal and fragile site alleles is not known. Here, we report that bromodeoxyuridine-inducible, distamycin A–insensitive fragile site FRA10B is composed of expanded 42 bp repeats. Differences in repeat motif length or composition between different FRA10B families indicate multiple independent expansion events. Some FRA10B alleles comprise a mixture of different expanded repeat motifs. FRA10B fragile site and long normal alleles share flanking polymorphisms. Somatic and intergenerational FRA10B repeat instability analogous to that found in expanded trinucleotide repeats supports dynamic mutation as a common mechanism for repeat expansion.|
|Keywords:||Humans; Chromosome Fragility; DNA, Satellite; Chromosome Mapping; Cloning, Molecular; Polymerase Chain Reaction; Pedigree; DNA Mutational Analysis; Base Sequence; Repetitive Sequences, Nucleic Acid; Mutation; Polymorphism, Genetic; Alleles; Chromosome Fragile Sites; Molecular Sequence Data; Family Health|
|Description:||Available online 27 September 2000.|
|Rights:||Copyright © 1998 Cell Press. All rights reserved.|
|Appears in Collections:||Paediatrics publications|
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