Adam S. Dawe
Low-intensity microwave irradiation does not substantially alter gene expression in late larval and adult Caenorhabditis elegans.
Dawe, Adam S.; Bodhicharla, Rakesh; Graham, Neil; May, Sean; Reader, Tom; Loader, Benjamin; Gregory, Andrew; Swicord, Mays; Bit-Babik, Giorgi; de Pomerai, David I.
Authors
Rakesh Bodhicharla
NEIL GRAHAM NEIL.GRAHAM@NOTTINGHAM.AC.UK
Senior Research Fellow
Professor SEAN MAY SEAN.MAY@NOTTINGHAM.AC.UK
Professor of Plant Cyber Infrastructure
TOM READER TOM.READER@NOTTINGHAM.AC.UK
Associate Professor
Benjamin Loader
Andrew Gregory
Mays Swicord
Giorgi Bit-Babik
David I. de Pomerai
Abstract
Reports that low-intensity microwave radiation induces heat-shock reporter gene expression in the nematode, Caenorhabditis elegans, have recently been reinterpreted as a subtle thermal effect caused by slight heating. This study used a microwave exposure system (1.0 GHz, 0.5 W power input; SAR 0.9-3 mW kg-1 for 6-well plates) that minimises temperature differentials between sham and exposed conditions (≤0.1 °C). Parallel measurement and simulation studies of SAR distribution within this exposure system are presented. We compared 5 Affymetrix gene-arrays of pooled triplicate RNA populations from sham-exposed L4/adult worms against 5 gene-arrays of pooled RNA from microwave-exposed worms (taken from the same source population in each run). No genes showed consistent expression changes across all 5 comparisons, and all expression changes appeared modest after normalisation (≤ 40% up- or down-regulated). The number of statistically significant differences in gene expression (846) was less than the false-positive rate expected by chance (1131). We conclude that the pattern of gene expression in L4/adult C. elegans is substantially unaffected by low-intensity microwave radiation; the minor changes observed in this study could well be false positives. As a positive control, we compared RNA samples from N2 worms subjected to a mild heat-shock treatment (30ºC) against controls at 26 ºC (2 gene arrays per condition). As expected, heat-shock genes are strongly up-regulated at 30ºC, particularly an hsp-70 family member (C12C8.1) and hsp-16.2 . Under these heat-shock conditions, we confirmed that an hsp-16.2::GFP transgene was strongly up-regulated, whereas two non-heat-inducible transgenes (daf-16::GFP; cyp-34A9::GFP) showed little change in expression.
Citation
Dawe, A. S., Bodhicharla, R., Graham, N., May, S., Reader, T., Loader, B., …de Pomerai, D. I. (2009). Low-intensity microwave irradiation does not substantially alter gene expression in late larval and adult Caenorhabditis elegans. Bioelectromagnetics, 30(8), https://doi.org/10.1002/bem.20515
Journal Article Type | Article |
---|---|
Publication Date | Jan 1, 2009 |
Deposit Date | Jun 14, 2013 |
Publicly Available Date | Jun 14, 2013 |
Journal | Bioelectromagnetics |
Print ISSN | 0197-8462 |
Electronic ISSN | 1521-186X |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 30 |
Issue | 8 |
DOI | https://doi.org/10.1002/bem.20515 |
Public URL | https://nottingham-repository.worktribe.com/output/1014301 |
Publisher URL | http://onlinelibrary.wiley.com/doi/10.1002/bem.20515/abstract |
Additional Information | The definitive version is available at: www3.interscience.wiley.com |
Files
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