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Type: Journal article
Title: Analysis of replication timing at the FRA10B and FRA16B fragile site loci
Author: Handt, O.
Baker, E.
Dayan, S.
Gartler, S.
Woollatt, E.
Richards, R.
Hansen, R.
Citation: Chromosome Research: the international journal for all aspects of chromosome and nuclear biology, 2000; 8(8):677-688
Publisher: Kluwer Academic Publ
Issue Date: 2000
ISSN: 0967-3849
Statement of
Oliva Handt, Elizabeth Baker, Sonia Dayan, Stanley M. Gartler, Erica Woollatt, Robert I. Richards and R. Scott Hansen
Abstract: The molecular basis for the cytogenetic appearance of chromosomal fragile sites is not yet understood. Late replication and further delay of replication at fragile sites expressing alleles has been observed for FRAXA, FRAXE and FRA3B fragile site loci. We analysed the timing of replication at the FRA10B and FRA16B loci to determine whether late replication is a feature which is shared by all fragile sites and, therefore, is a necessary condition for chromosomal fragile site expression. The FRA10B locus was located in a transitional region between early and late zones of replication. Fragile and non-fragile alleles exhibit a similar replication pattern proximal to the repeat, but fragile alleles are delayed relative to non-fragile ones on the distal side. Although fragility at FRA10B appears to be caused by expansion of an AT-rich repeat in the region, replication time near the repeat was similar in fragile and non-fragile alleles. The FRA16B locus was late replicating and appeared to replicate even later on fragile chromosomes. While these observations are compatible with the hypothesis that delayed replication may play a role in fragile site expression, they suggest that replication delay may not need to occur at the expanded repeat region itself in order to be permissive for fragility.
Keywords: fragile site
minisatellite repeat
replication timing
Rights: © Kluwer Academic Publishers.
DOI: 10.1023/A:1026737203447
Appears in Collections:Aurora harvest 6
Molecular and Biomedical Science publications

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