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Novel functional requirements for non-homologous DNA end joining in Schizosaccharomyces pombe

journal contribution
posted on 2023-06-08, 08:50 authored by Kostas G Manolis, Elaine R Nimmo, Edgar Hartsuiker, Antony CarrAntony Carr, Penny Jeggo, Robin C Allshire
DNA double strand break (DSB) repair by non-homologous end joining (NHEJ) in mammalian cells requires the Ku70¿Ku80 heterodimer, the DNA-PK catalytic subunit DNA-PKcs, as well as DNA ligase IV and Xrcc4. NHEJ of plasmid DSBs in Saccharomyces cerevisiae requires Ku, Xrcc4 and DNA ligase IV, as well as Mre11, Rad50, Xrs2 and DNA damage checkpoint proteins. Saccharomyces cerevisiae Ku is also required for telomere length maintenance and transcriptional silencing. We have characterized NHEJ in Schizosaccharomyces pombe using an extrachromosomal assay and find that, as anticipated, it is Ku70 and DNA ligase IV dependent. Unexpectedly, we find that Rad32, Rad50 (the S.pombe homologues of Mre11 and Rad50, respectively) and checkpoint proteins are not required for NHEJ. Furthermore, although S.pombe Ku70 is required for maintenance of telomere length, it is dispensable for transcriptional silencing at telomeres and is located throughout the nucleus rather than concentrated at the telomeres. Together, these results provide insight into the mechanism of NHEJ and contrast significantly with recent studies in S.cerevisiae.

History

Publication status

  • Published

Journal

EMBO Journal

ISSN

0261-4189

Publisher

Nature Publishing Group

Volume

20

Page range

210-221

Pages

12.0

Department affiliated with

  • Sussex Centre for Genome Damage Stability Publications

Notes

I participated in the analysis of Rad50 in non homologous end joining by providing deletion strains and through extensive advice and discussions with the first author of the paper. We show that Rad50 is not involved in non-homologous end joining in S. pombe.

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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