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MRX protects telomeric DNA at uncapped telomeres of budding yeast cdc13-1 mutants.
DNA Repair (Amst). 2006 Jul 13; 5(7):840-51.DR

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.

Authors+Show Affiliations

Institute for Ageing and Health, University of Newcastle, Henry Wellcome Laboratory for Biogerontology Research, Newcastle General Hospital, Newcastle upon Tyne NE4 6BE, UK.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16765654

Citation

Foster, Steven S., et al. "MRX Protects Telomeric DNA at Uncapped Telomeres of Budding Yeast Cdc13-1 Mutants." DNA Repair, vol. 5, no. 7, 2006, pp. 840-51.
Foster SS, Zubko MK, Guillard S, et al. MRX protects telomeric DNA at uncapped telomeres of budding yeast cdc13-1 mutants. DNA Repair (Amst). 2006;5(7):840-51.
Foster, S. S., Zubko, M. K., Guillard, S., & Lydall, D. (2006). MRX protects telomeric DNA at uncapped telomeres of budding yeast cdc13-1 mutants. DNA Repair, 5(7), 840-51.
Foster SS, et al. MRX Protects Telomeric DNA at Uncapped Telomeres of Budding Yeast Cdc13-1 Mutants. DNA Repair (Amst). 2006 Jul 13;5(7):840-51. PubMed PMID: 16765654.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - MRX protects telomeric DNA at uncapped telomeres of budding yeast cdc13-1 mutants. AU - Foster,Steven S, AU - Zubko,Mikhajlo K, AU - Guillard,Sandrine, AU - Lydall,David, Y1 - 2006/06/12/ PY - 2006/02/07/received PY - 2006/04/07/revised PY - 2006/04/19/accepted PY - 2006/6/13/pubmed PY - 2006/9/9/medline PY - 2006/6/13/entrez SP - 840 EP - 51 JF - DNA repair JO - DNA Repair (Amst) VL - 5 IS - 7 N2 - 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. SN - 1568-7864 UR - https://www.unboundmedicine.com/medline/citation/16765654/MRX_protects_telomeric_DNA_at_uncapped_telomeres_of_budding_yeast_cdc13_1_mutants_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1568-7864(06)00115-7 DB - PRIME DP - Unbound Medicine ER -