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PLoS One. 2013 Jun 11;8(6):e65604. doi: 10.1371/journal.pone.0065604. Print 2013.

Evolution of a higher intracellular oxidizing environment in Caenorhabditis elegans under relaxed selection.

Author information

1
Department of Biology, Eastern Washington University, Cheney, Washington, United States of America. jmatos@ewu.edu

Abstract

We explored the relationship between relaxed selection, oxidative stress, and spontaneous mutation in a set of mutation-accumulation (MA) lines of the nematode Caenorhabditis elegans and in their common ancestor. We measured steady-state levels of free radicals and oxidatively damaged guanosine nucleosides in the somatic tissues of five MA lines for which nuclear genome base substitution and GC-TA transversion frequencies are known. The two markers of oxidative stress are highly correlated and are elevated in the MA lines relative to the ancestor; point estimates of the per-generation rate of mutational decay (ΔM) of these measures of oxidative stress are similar to those reported for fitness-related traits. Conversely, there is no significant relationship between either marker of oxidative stress and the per-generation frequencies of base substitution or GC-TA transversion. Although these results provide no direct evidence for a causative relationship between oxidative damage and base substitution mutations, to the extent that oxidative damage may be weakly mutagenic in the germline, the case for condition-dependent mutation is advanced.

PMID:
23776511
PMCID:
PMC3679170
DOI:
10.1371/journal.pone.0065604
[Indexed for MEDLINE]
Free PMC Article

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