Radioresistance of Deinococcus radiodurans: functions necessary to survive ionizing radiation are also necessary to survive prolonged desiccation.
Forty-one ionizing radiation-sensitive strains of Deinococcus radiodurans were evaluated for their ability to survive 6 weeks of desiccation. All exhibited a substantial loss of viability upon rehydration compared with wild-type D. radiodurans. Examination of chromosomal DNA from desiccated cultures revealed a time-dependent increase in DNA damage, as measured by an increase in DNA double-strand breaks. The evidence presented suggests that D. radiodurans' ionizing radiation resistance is incidental, a consequence of this organism's adaptation to a common physiological stress, dehydration.
Department of Microbiology, Louisiana State University, Baton Rouge 70803, USA.
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V
Mattimore
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JR
Battista
D004249:DNA Damage; D004260:DNA Repair; D003890:Desiccation; D008837:Micrococcus / Q000235:genetics / Q000528:radiation effects*; D011836:Radiation Tolerance