Microarray analysis of the hyperthermophilic archaeon Pyrococcus furiosus exposed to gamma irradiation

Ernest Williams, Todd M. Lowe, Jeffrey Savas, Jocelyne DiRuggiero*

*Corresponding author for this work

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

The remarkable survival of the hyperthermophilic archaeon Pyrococcus furiosus to ionizing radiation was previously demonstrated. Using a time course study and whole-genome microarray analyses of mRNA transcript levels, the genes and regulatory pathways involved in the repair of lesions produced by ionizing irradiation (oxidative damage and DNA strand breaks) in P. furiosus were investigated. Data analyses showed that radA, encoding the archaeal homolog of the RecA/Rad51 recombinase, was moderately up regulated by irradiation and that a putative DNA-repair gene cluster was specifically induced by exposure to ionizing radiation. This novel repair system appears to be unique to thermophilic archaea and bacteria and is suspected to be involved in translesion synthesis. Genes that encode for a putative Dps-like iron-chelating protein and two membrane-bound oxidoreductases were differentially expressed following gamma irradiation, potentially in response to oxidative stress. Surprisingly, the many systems involved in oxygen detoxification and redox homeostasis appeared to be constitutively expressed. Finally, we identified several transcriptional regulators and protein kinases highly regulated in response to gamma irradiation.

Original languageEnglish (US)
Pages (from-to)19-29
Number of pages11
JournalExtremophiles
Volume11
Issue number1
DOIs
StatePublished - Jan 1 2007

Keywords

  • Archaea
  • DNA repair
  • Hyperthermophile
  • Ionizing radiation
  • Oxidative stress
  • Transcriptional analysis

ASJC Scopus subject areas

  • Microbiology
  • Molecular Medicine

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