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23 September 2015 Accelerated 48Ti Ions Induce Autosomal Mutations in Mouse Kidney Epithelium at Low Dose and Fluence
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Exposure to high-energy charged particles (HZE ions) at low fluence could significantly affect astronaut health after prolonged missions in deep space by inducing mutations and related cancers. We tested the hypothesis that the mutagenic effects of HZE ions could be detected at low fluence in a mouse model that detects autosomal mutations in vivo. Aprt heterozygous mice were exposed to 0.2, 0.4 and 1.4 Gy of densely ionizing 48Ti ions (1 GeV/amu, LET = 107 keV/μm). We observed a dose-dependent increase in the Aprt mutant fraction in kidney epithelium at the two lowest doses (an average of 1 or 2 particles/cell nucleus) that plateaued at the highest dose (7 particles/cell nucleus). Mutant cells were expanded to determine mutation spectra and translocations affecting chromosome 8, which encodes Aprt. A PCR-based analysis for loss of heterozygosity (LOH) events on chromosome 8 demonstrated a significant shift in the mutational spectrum from Ti ion exposure, even at low fluence, by revealing “radiation signature” mutations in mutant cells from exposed mice. Likewise, a cytogenetic assay for nonreciprocal chromosome 8 translocations showed an effect of exposure. A genome-wide LOH assay for events affecting nonselected chromosomes also showed an effect of exposure even for the lowest dose tested. Considered in their entirety, these results show that accelerated 48Ti ions induce large mutations affecting one or more chromosomes at low dose and fluence.

Gwen Hryciw, Dmytro Grygoryev, Michael Lasarev, Anna Ohlrich, Cristian Dan, Ravi Madhira, Bradley Eckelmann, Stacey Gauny, Amy Kronenberg, and Mitchell S. Turker "Accelerated 48Ti Ions Induce Autosomal Mutations in Mouse Kidney Epithelium at Low Dose and Fluence," Radiation Research 184(4), 367-377, (23 September 2015).
Received: 29 April 2015; Accepted: 1 July 2015; Published: 23 September 2015

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