Twenty years of FISH-based translocation analysis for retrospective ionizing radiation biodosimetry.

Abstract:

PURPOSE:The fluorescent in situ hybridization (FISH) technique, which easily detects reciprocal translocations, is currently used to estimate doses in retrospective biological dosimetry, after suspected accidental overexposure to ionizing radiation (IR). This study of 42 cases aimed to verify the appropriateness of this assay for radiation dose reconstruction, compared to the dicentric assay, and to evaluate other limitations. MATERIAL AND METHODS:We labeled chromosomes 2, 4, and 12 by 3-color FISH painting to detect translocations on lymphocytes of patients with suspected past IR overexposure. RESULT:Translocation dose estimation showed doses significantly different from 0 Gy in 25 of the 42 cases. The lowest positive dose measured was 0.3 Gy. Several months after IR exposure, the doses measured by translocation and dicentric assays are quite similar. For a year, dose estimation by translocation assay becomes more relevant as dicentric frequency starts to decrease, coming close to 0 for more than a year after the exposure. The persistence of translocations enabled us to corroborate an overexposure 44 years earlier. Interpretation of the observed translocation yield requires the knowledge of the patient's other radiation exposures. A dose assessment by this biomarker is relevant only if the radiation exposure is confirmed. CONCLUSIONS:This technique is appropriate for corroborating a former IR exposure of individuals. When the radiation dose is greater than 1 Gy, the translocations in complex exchanges must be considered. Another relevant point is the use of an appropriate background yield of translocations. The dose assessment, however, also depends on exposure to various genotoxic agents besides IR. If no evidence about the existence of radiation exposure is available, dose assessment is not useful. For this reason, report only the translocation frequency and its comparison with the background yield by age class is preferable.

journal_name

Int J Radiat Biol

authors

Grégoire E,Roy L,Buard V,Delbos M,Durand V,Martin-Bodiot C,Voisin P,Sorokine-Durm I,Vaurijoux A,Voisin P,Baldeyron C,Barquinero JF

doi

10.1080/09553002.2018.1427903

subject

Has Abstract

pub_date

2018-03-01 00:00:00

pages

248-258

issue

3

eissn

0955-3002

issn

1362-3095

journal_volume

94

pub_type

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