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. 1988 Nov;85(21):8081–8085. doi: 10.1073/pnas.85.21.8081

Asynchronous DNA replication within the human beta-globin gene locus.

E Epner 1, W C Forrester 1, M Groudine 1
PMCID: PMC282358  PMID: 3186709

Abstract

The timing of DNA replication of the human beta-globin gene locus has been studied by blot hybridization of newly synthesized BrdUrd-substituted DNA from cells in different stages of the S phase. Using probes that span greater than 120 kilobases across the human beta-globin gene locus, we show that the majority of this domain replicates in early S phase in the human erythroleukemia cell line K562 and in middle-to-late S phase in the lymphoid cell line Manca. However, in K562 cells three small regions display a strikingly different replication pattern than adjacent sequences. These islands, located in the inter-gamma-globin gene region and approximately 20 kilobases 5' to the epsilon-globin gene and 20 kilobases 3' to the beta-globin gene, replicate later and throughout S phase. A similar area is also present in the alpha-globin gene region in K562 cells. We suggest that these regions may represent sites of termination of replication forks.

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