Involvement of Exo1b in DNA damage-induced apoptosis

Emma Bolderson, Derek J. Richard, Winfried Edelmann, Kum Kum Khanna

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Apoptosis is essential for the maintenance of inherited genomic integrity. During DNA damage-induced apoptosis, mechanisms of cell survival, such as DNA repair are inactivated to allow cell death to proceed. Here, we describe a role for the mammalian DNA repair enzyme Exonuclease 1 (Exo1) in DNA damage-induced apoptosis. Depletion of Exo1 in human fibroblasts, or mouse embryonic fibroblasts led to a delay in DNA damage-induced apoptosis. Furthermore, we show that Exo1 acts upstream of caspase-3, DNA fragmentation and cytochrome c release. In addition, induction of apoptosis with DNA-damaging agents led to cleavage of both isoforms of Exo1. The cleavage of Exo1 was mapped to Asp514, and shown to be mediated by caspase-3. Expression of a caspase-3 cleavage site mutant form of Exo1, Asp514Ala, prevented formation of the previously observed fragment without any affect on the onset of apoptosis. We conclude that Exo1 has a role in the timely induction of apoptosis and that it is subsequently cleaved and degraded during apoptosis, potentially inhibiting DNA damage repair.

Original languageEnglish (US)
Pages (from-to)3452-3463
Number of pages12
JournalNucleic Acids Research
Volume37
Issue number10
DOIs
StatePublished - 2009

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DNA Damage
Apoptosis
Caspase 3
DNA Repair
Fibroblasts
DNA Repair Enzymes
DNA Fragmentation
Cytochromes c
exodeoxyribonuclease I
Cell Survival
Protein Isoforms
Cell Death
Maintenance
DNA

ASJC Scopus subject areas

  • Genetics

Cite this

Involvement of Exo1b in DNA damage-induced apoptosis. / Bolderson, Emma; Richard, Derek J.; Edelmann, Winfried; Khanna, Kum Kum.

In: Nucleic Acids Research, Vol. 37, No. 10, 2009, p. 3452-3463.

Research output: Contribution to journalArticle

Bolderson, E, Richard, DJ, Edelmann, W & Khanna, KK 2009, 'Involvement of Exo1b in DNA damage-induced apoptosis', Nucleic Acids Research, vol. 37, no. 10, pp. 3452-3463. https://doi.org/10.1093/nar/gkp194
Bolderson, Emma ; Richard, Derek J. ; Edelmann, Winfried ; Khanna, Kum Kum. / Involvement of Exo1b in DNA damage-induced apoptosis. In: Nucleic Acids Research. 2009 ; Vol. 37, No. 10. pp. 3452-3463.
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