Mar 27, 2014

Bedrock radioactivity influences the rate and spectrum of mutation

BioRxiv : the Preprint Server for Biology
Adam P LevineChristophe J Douady

Abstract

All organisms on Earth are exposed to low doses of natural radioactivity but some habitats are more radioactive than others. Yet, documenting the influence of natural radioactivity on the evolution of biodiversity is challenging. Here, we addressed whether organisms living in naturally more radioactive habitats accumulate more mutations across generations using 14 species of waterlice living in subterranean habitats with contrasted levels of radioactivity. We found that the mitochondrial and nuclear mutation rates across a waterlouse species' genome increased on average by 60 and 30%, respectively, when radioactivity increased by a factor of three. We also found a positive correlation between the level of radioactivity and the probability of G to T (and complementary C to A) mutations, a hallmark of oxidative stress. We conclude that even low doses of natural bedrock radioactivity influence the mutation rate through the likely accumulation of oxidative damage, in particular in the mitochondrial genome.

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Mentioned in this Paper

Base
CYBB
Normal Cell
Body Fluid Compartments
Extracellular
Enzymes, antithrombotic
Membrane
HVCN1 gene
Valinomycin
Oxidase

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