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Mre11 modulates the fidelity of fusion between short telomeres in human cells

Tankimanova, Maira, Capper, Rebecca, Letsolo, Boitelo Theresiah, Rowson, Janet Maud, Robinson, Rhiannon, Britt-Compton, Bethan, Taylor, A. Malcolm R. and Baird, Duncan Martin ORCID: 2012. Mre11 modulates the fidelity of fusion between short telomeres in human cells. Nucleic Acids Research 40 (6) , pp. 2518-2526. 10.1093/nar/gkr1117

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The loss of telomere function can result in the fusion of telomeres with other telomeric loci, or non-telomeric double-stranded DNA breaks. Sequence analysis of fusion events between short dysfunctional telomeres in human cells has revealed that fusion is characterized by a distinct molecular signature consisting of extensive deletions and micro-homology at the fusion points. This signature is consistent with alternative error-prone end-joining processes. We have examined the role that Mre11 may play in the fusion of short telomeres in human cells; to do this, we have analysed telomere fusion events in cells derived from ataxia-telangiectasia-like disorder (ATLD) patients that exhibit hypomorphic mutations in MRE11. The telomere dynamics of ATLD fibroblasts were indistinguishable from wild-type fibroblasts and they were proficient in the fusion of short telomeres. However, we observed a high frequency of insertion of DNA sequences at the fusion points that created localized sequence duplications. These data indicate that Mre11 plays a role in the fusion of short dysfunctional telomeres in human cells and are consistent with the hypothesis that as part of the MRN complex it serves to stabilize the joining complex, thereby controlling the fidelity of the fusion reaction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: Q Science > QH Natural history > QH426 Genetics
R Medicine > R Medicine (General)
Publisher: Oxford University Press
ISSN: 0305-1048
Last Modified: 06 Nov 2022 13:44

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