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Genome-wide DNA replication profile for Drosophila melanogaster: a link between transcription and replication timing

Abstract

Replication of the genome before mitotic cell division is a highly regulated process that ensures the fidelity of DNA duplication. DNA replication initiates at specific locations, termed origins of replication, and progresses in a defined temporal order during the S phase of the cell cycle. The relationship between replication timing and gene expression has been the subject of some speculation1. A recent genome-wide analysis in Saccharomyces cerevisiae showed no association between replication timing and gene expression2. In higher eukaryotes, the limited number of genomic loci analyzed has not permitted a firm conclusion regarding this association. To explore the relationship between DNA replication and gene expression in higher eukaryotes, we developed a strategy to measure the timing of DNA replication for thousands of genes in a single DNA array hybridization experiment. Using this approach, we generated a genome-wide map of replication timing for Drosophila melanogaster. Moreover, by surveying over 40% of all D. melanogaster genes, we found a strong correlation between DNA replication early in S phase and transcriptional activity. As this correlation does not exist in S. cerevisiae, this interplay between DNA replication and transcription may be a unique characteristic of higher eukaryotes.

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Figure 1: Experimental strategy to measure the timing of DNA replication using spotted microarrays.
Figure 2: Replication timing of genes in the part of chromosome 2L proximal to the telomere.
Figure 3: Replication profile for the sequenced D. melanogaster genome.
Figure 4: Relationship between transcription and timing of DNA replication.

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Acknowledgements

We thank A. Oryan for Kc cells; E. Giniger for coordinating the assembly of the Northwest Fly Consortium microarray; C. Neal for array construction and cDNA analysis; J. Schreiber, D. Cimbora and members of the Groudine lab for suggestions; and S. Henikoff, D. Gottschling and M. Lorincz for comments on the manuscript. This work was supported in part by US National Institute of Health grants to M.G. and C.K., a grant from the Netherlands Academy of Sciences to B.v.S. and a fellowship grant from the Rett Syndrome Research Foundation to D.S.

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Correspondence to Dirk Schübeler or Mark Groudine.

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Schübeler, D., Scalzo, D., Kooperberg, C. et al. Genome-wide DNA replication profile for Drosophila melanogaster: a link between transcription and replication timing. Nat Genet 32, 438–442 (2002). https://doi.org/10.1038/ng1005

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