Published in:
Open Access
01-07-2016 | Original Article
Gene signature of the post-Chernobyl papillary thyroid cancer
Authors:
Daria Handkiewicz-Junak, Michal Swierniak, Dagmara Rusinek, Małgorzata Oczko-Wojciechowska, Genevieve Dom, Carine Maenhaut, Kristian Unger, Vincent Detours, Tetiana Bogdanova, Geraldine Thomas, Ilya Likhtarov, Roman Jaksik, Malgorzata Kowalska, Ewa Chmielik, Michal Jarzab, Andrzej Swierniak, Barbara Jarzab
Published in:
European Journal of Nuclear Medicine and Molecular Imaging
|
Issue 7/2016
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Abstract
Purpose
Following the nuclear accidents in Chernobyl and later in Fukushima, the nuclear community has been faced with important issues concerning how to search for and diagnose biological consequences of low-dose internal radiation contamination. Although after the Chernobyl accident an increase in childhood papillary thyroid cancer (PTC) was observed, it is still not clear whether the molecular biology of PTCs associated with low-dose radiation exposure differs from that of sporadic PTC.
Methods
We investigated tissue samples from 65 children/young adults with PTC using DNA microarray (Affymetrix, Human Genome U133 2.0 Plus) with the aim of identifying molecular differences between radiation-induced (exposed to Chernobyl radiation, ECR) and sporadic PTC. All participants were resident in the same region so that confounding factors related to genetics or environment were minimized.
Results
There were small but significant differences in the gene expression profiles between ECR and non-ECR PTC (global test, p < 0.01), with 300 differently expressed probe sets (p < 0.001) corresponding to 239 genes. Multifactorial analysis of variance showed that besides radiation exposure history, the BRAF mutation exhibited independent effects on the PTC expression profile; the histological subset and patient age at diagnosis had negligible effects. Ten genes (PPME1, HDAC11, SOCS7, CIC, THRA, ERBB2, PPP1R9A, HDGF, RAD51AP1, and CDK1) from the 19 investigated with quantitative RT-PCR were confirmed as being associated with radiation exposure in an independent, validation set of samples.
Conclusion
Significant, but subtle, differences in gene expression in the post-Chernobyl PTC are associated with previous low-dose radiation exposure.