Effects of heavy ions on inactivation and DNA double strand breaks in Deinococcus radiodurans R1
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Advances in space microbiology
2021, iScienceCitation Excerpt :The results obtained from this experiment led to the conclusion that the spores (1 μm diameter) on the outer areas were not affected by the high-energy particles of the galactic cosmic radiations; instead, a “bystander effect” was observed in which the effect of charged particles traversed from the outer layer of spores to the surrounding spores, where a biological effect was observed. Additionally, DNA is more prone to be damaged by radiation through the formation of double-stranded breaks that ultimately result in mutations, as observed in E. coli, B. subtilis, and Deinococcus radiodurans (Micke et al., 1994; Schafer et al., 1994; Zimmermann et al., 1994). Microorganisms possess several mechanisms to repair DNA, either by homologous recombination or non-homologous end joining (NHEJ).
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