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The firing of eukaryotic origins of DNA replication requires CDK and DDK kinase activities. DDK, in particular, is involved in setting the temporal program of origin activation, a conserved feature of eukaryotes. Rif1, originally identified as a telomeric protein, was recently implicated in specifying replication timing in yeast and mammals. We show that this function of Rif1 depends on its interaction...
Telomere repeat sequences are added to linear chromosome ends by telomerase, an enzyme comprising a reverse transcriptase (TERT) and an RNA template component (TR). We aimed to investigate TR in the DT40 B-cell tumour line using gene targeting, but were unable to generate TR nulls, suggesting a requirement for TR in DT40 proliferation. Disruption of one TR allele reduced telomerase activity and caused...
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