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Mitochondrial DNA mutations in individuals occupationally exposed to ionizing radiation

Wilding, CS and Cadwell, K and Tawn, EJ and Relton, CL and Taylor, GA and Chinnery, PF and Turnbull, DM (2006) Mitochondrial DNA mutations in individuals occupationally exposed to ionizing radiation. RADIATION RESEARCH, 165 (2). pp. 202-207. ISSN 0033-7587

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Abstract

Mutations in a 443-bp amplicon of the hypervariable region HVR1 of the D-loop of mitochondrial DNA (mtDNA) were quantified in DNA extracted from peripheral blood samples of 10 retired radiation workers who had accumulated external radiation doses of .0.9 Sv over the course of their working life and were compared to the levels of mutations in 10 control individuals matched for age and smoking status. The mutation rate in the 10 exposed individuals was 9.92 3 1025 mutations/ nucleotide, and for the controls it was 8.65 3 1025 mutations/ nucleotide, with a procedural error rate of 2.65 3 1025 mutations/ nucleotide. No increase in mtDNA mutations due to radiation exposure was detectable (P 5 0.640). In contrast, chromosomal translocation frequencies, a validated radiobiological technique for retrospective dosimetric purposes, were significantly elevated in the exposed individuals. This suggests that mutations identified through sequencing of mtDNA in peripheral blood lymphocytes do not represent a promising genetic marker of DNA damage after low-dose or low-doserate exposures to ionizing radiation. There was an increase in singleton mutations above that attributable to procedural error in both exposed and control groups that is likely to reflect age-related somatic mutation.

Item Type: Article
Uncontrolled Keywords: 06 Biological Sciences, 11 Medical And Health Sciences, 02 Physical Sciences
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Divisions: Natural Sciences and Psychology
Publisher: RADIATION RESEARCH SOC
Related URLs:
Date Deposited: 20 Jan 2016 13:53
Last Modified: 20 Jan 2016 13:53
DOI or Identification number: 10.1667/RR3494.1
URI: http://researchonline.ljmu.ac.uk/id/eprint/2705

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