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. 1994 Aug;5(8):839–849. doi: 10.1091/mbc.5.8.839

Physical mapping of origins of replication in the fission yeast Schizosaccharomyces pombe.

J G Wohlgemuth 1, G H Bulboaca 1, M Moghadam 1, M S Caddle 1, M P Calos 1
PMCID: PMC301105  PMID: 7803852

Abstract

We isolated four fragments from the Schizosaccharomyces pombe genome that mediate autonomous replication. A two-dimensional gel analysis revealed that in each case initiation could be mapped to within the S. pombe sequences. In three of the fragments, initiation could be mapped to one discrete location. In the fourth fragment, subcloning and two-dimensional gel analysis suggested that two discrete origins of replication were located within 3 kb of each other. When in proximity, usually only one of these origins fired, suggesting origin interference. Two-dimensional gel analysis of the four origin fragments at their genomic locations demonstrated that each is used in the chromosomes, but in only a subset of cells or cell divisions. The S. pombe genome appears to contain many discrete origins, not all of which fire in any given cell and some of which are closely spaced. Not I/Sfi I mapping of the five origins from this and a previous study indicates that they are randomly distributed throughout the genome and appear to be representative of chromosomal origins of replication in this organism. We compare the features of S. pombe replication origins with those of S. cerevisiae and animal cells.

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