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MRX protects telomeric DNA at uncapped telomeres of budding yeast cdc13-1 mutants

Lookup NU author(s): Steven Foster, Dr Mikhajlo Zubko, Professor David Lydall

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Abstract

MRX, an evolutionally conserved DNA damage response complex composed of Mre11, Rad50 and Xrs2, is involved in DNA double strand break (DSB) repair, checkpoint activation and telomere maintenance. At DSBs, MRX plays a role in generating single stranded DNA (ssDNA) and signalling cell cycle arrest. Here we investigated whether MRX also contributes to generating ssDNA or signalling cell cycle arrest at uncapped telomeres. To investigate the role of MRX, we generated a conditionally degradable Rad50 protein and combined this with cdc13-1, a temperature sensitive mutation in the Cdc13 telomere capping protein. We show that Rad50 does not contribute to ssDNA generation or cell cycle arrest in response to cdcl3-1 uncapped telomeres. Instead, we find that Rad50 inhibits ssDNA accumulation and promotes cdc13-1 cell viability, consistent with a major role for MRX in telomere capping. © 2006 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Foster SS, Zubko MK, Guillard S, Lydall D

Publication type: Article

Publication status: Published

Journal: DNA Repair

Year: 2006

Volume: 5

Issue: 7

Pages: 840-851

ISSN (print): 1568-7864

ISSN (electronic): 1568-7856

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.dnarep.2006.04.005

DOI: 10.1016/j.dnarep.2006.04.005

PubMed id: 16765654

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