Identification of two telomere-proximal fission yeast DNA replication origins constrained by nearby cis-acting sequences to replicate in late S phase

F1000Research
Amna Chaudari, Joel A Huberman

Abstract

Telomeres of the fission yeast,  Schizosaccharomyces pombe, are known to replicate in late S phase, but the reasons for this late replication are not fully understood. We have identified two closely-spaced DNA replication origins, 5.5 to 8 kb upstream from the telomere itself. These are the most telomere-proximal of all the replication origins in the fission yeast genome. When located by themselves in circular plasmids, these origins fired in early S phase, but if flanking sequences closer to the telomere were included in the circular plasmid, then replication was restrained to late S phase - except in cells lacking the replication-checkpoint kinase, Cds1. We conclude that checkpoint-dependent late replication of telomere-associated sequences is dependent on nearby cis-acting sequences, not on proximity to the physical end of a linear chromosome.

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Citations

May 9, 2019·Current Genetics·Thomas S van Emden, Sigurd Braun
Jul 28, 2020·Trends in Genetics : TIG·Patroula NathanailidouZoi Lygerou

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Datasets Mentioned

BETA
U03438

Methods Mentioned

BETA
electrophoresis
PCR
flow cytometry

Software Mentioned

MEME
MacVector
IP Lab

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