Santocanale C and Diffley JF (1998) (original) (raw)

Reference: Santocanale C and Diffley JF (1998)

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Abstract

DNA replication in eukaryotic cells initiates from many replication origins which fire throughout the S phase of the cell cycle in a predictable pattern: some origins fire early, others late. Little is known about how the initiation of DNA replication and the elongation of newly synthesized DNA strands are coordinated during S phase. Here we show that, in budding yeast, hydroxyurea, which blocks the progression of replication forks from early-firing origins, also inhibits the firing of late origins. These late origins are maintained in the initiation-competent prereplicative state for extended periods. The block to late origin firing is an active process and is defective in yeast with mutations in the rad53 and mec1 checkpoint genes, indicating that regulation of late origin firing may also be an important component of the 'intra-S-phase' checkpoint and may aid cell survival under adverse conditions.

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Journal Article

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Santocanale C, Diffley JF

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