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Sae2, Exo1 and Sgs1 collaborate in DNA double-strand break processing

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  • Eleni P. Mimitou

    (Columbia University Medical Center, 701 West 168th Street, New York, New York 10032, USA)

  • Lorraine S. Symington

    (Columbia University Medical Center, 701 West 168th Street, New York, New York 10032, USA)

Abstract

DNA ends exposed after introduction of double-strand breaks (DSBs) undergo 5′–3′ nucleolytic degradation to generate single-stranded DNA, the substrate for binding by the Rad51 protein to initiate homologous recombination. This process is poorly understood in eukaryotes, but several factors have been implicated, including the Mre11 complex (Mre11–Rad50–Xrs2/NBS1), Sae2/CtIP/Ctp1 and Exo1. Here we demonstrate that yeast Exo1 nuclease and Sgs1 helicase function in alternative pathways for DSB processing. Novel, partially resected intermediates accumulate in a double mutant lacking Exo1 and Sgs1, which are poor substrates for homologous recombination. The early processing step that generates partly resected intermediates is dependent on Sae2. When Sae2 is absent, in addition to Exo1 and Sgs1, unprocessed DSBs accumulate and homology-dependent repair fails. These results suggest a two-step mechanism for DSB processing during homologous recombination. First, the Mre11 complex and Sae2 remove a small oligonucleotide(s) from the DNA ends to form an early intermediate. Second, Exo1 and/or Sgs1 rapidly process this intermediate to generate extensive tracts of single-stranded DNA that serve as substrate for Rad51.

Suggested Citation

  • Eleni P. Mimitou & Lorraine S. Symington, 2008. "Sae2, Exo1 and Sgs1 collaborate in DNA double-strand break processing," Nature, Nature, vol. 455(7214), pages 770-774, October.
    • Handle: RePEc:nat:nature:v:455:y:2008:i:7214:d:10.1038_nature07312
    DOI: 10.1038/nature07312
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    Citations

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    Cited by:

    1. Ashish Kumar Singh & Tamás Schauer & Lena Pfaller & Tobias Straub & Felix Mueller-Planitz, 2021. "The biogenesis and function of nucleosome arrays," Nature Communications, Nature, vol. 12(1), pages 1-15, December.
    2. Lorenzo Galanti & Martina Peritore & Robert Gnügge & Elda Cannavo & Johannes Heipke & Maria Dilia Palumbieri & Barbara Steigenberger & Lorraine S. Symington & Petr Cejka & Boris Pfander, 2024. "Dbf4-dependent kinase promotes cell cycle controlled resection of DNA double-strand breaks and repair by homologous recombination," Nature Communications, Nature, vol. 15(1), pages 1-19, December.
    3. Priya Kapoor-Vazirani & Sandip K. Rath & Xu Liu & Zhen Shu & Nicole E. Bowen & Yitong Chen & Ramona Haji-Seyed-Javadi & Waaqo Daddacha & Elizabeth V. Minten & Diana Danelia & Daniela Farchi & Duc M. D, 2022. "SAMHD1 deacetylation by SIRT1 promotes DNA end resection by facilitating DNA binding at double-strand breaks," Nature Communications, Nature, vol. 13(1), pages 1-18, December.
    4. Vera M. Kissling & Giordano Reginato & Eliana Bianco & Kristina Kasaciunaite & Janny Tilma & Gea Cereghetti & Natalie Schindler & Sung Sik Lee & Raphaël Guérois & Brian Luke & Ralf Seidel & Petr Cejka, 2022. "Mre11-Rad50 oligomerization promotes DNA double-strand break repair," Nature Communications, Nature, vol. 13(1), pages 1-16, December.
    5. Erica J. Polleys & Isabella Priore & James E. Haber & Catherine H. Freudenreich, 2023. "Structure-forming CAG/CTG repeats interfere with gap repair to cause repeat expansions and chromosome breaks," Nature Communications, Nature, vol. 14(1), pages 1-16, December.
    6. Adrián Campos & Facundo Ramos & Lydia Iglesias & Celia Delgado & Eva Merino & Antonio Esperilla-Muñoz & Jaime Correa-Bordes & Andrés Clemente-Blanco, 2023. "Cdc14 phosphatase counteracts Cdk-dependent Dna2 phosphorylation to inhibit resection during recombinational DNA repair," Nature Communications, Nature, vol. 14(1), pages 1-20, December.

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