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Human Molecular Genetics, Vol 8, 1373-1386, Copyright © 1999 by Oxford University Press

ARTICLES

The pattern of replication at a human telomeric region (16p13.3): its relationship to chromosome structure and gene expression

ZE Smith and DR Higgs
MRC Molecular Haematology Unit, Institute of Molecular Medicine, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK.

We have studied replication throughout 325 kb of the telomeric region of a human chromosome (16p13.3) and related the findings to various aspects of chromosome structure and function (DNA sequence organization, nuclease-hypersensitive sites, nuclear matrix attachment sites, patterns of methylation and gene expression). The GC-rich isochore lying adjacent to the telomere, which contains the alpha- globin locus and many widely expressed genes, replicates early in the cell cycle regardless of the pattern of gene expression. In subtelomeric DNA, replication occurs later in the cell cycle and the most telomeric region (20 kb) is late replicating. Juxtaposition of early replicating DNA next to the telomere causes it to replicate later in S-phase. Analysis of the timing of replication in chromosomes with deletions, or in transgenes containing various segments of this telomeric region, suggests that there are no critical origins or zones that initiate replication, rather the pattern of replication appears to be related to the underlying chromatin structure which may restrict or facilitate access to multiple, redundant origins. These results contrast with the pattern of replication at the human beta-globin locus and this may similarly reflect the different chromosomal environments containing these gene clusters.
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