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DNA & Genetic Damage

Analysis of gene expression in a human-derived glial cell line exposed to 2.45 GHz continuous radiofrequency electromagnetic fields

No Effects Found

Sakurai T, Kiyokawa T, Narita E, Suzuki Y, Taki M, Miyakoshi J · 2011

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Brain cells showed no genetic changes when exposed to WiFi-frequency radiation at levels five times higher than current phone safety limits.

Plain English Summary

Summary written for general audiences

Researchers exposed human brain cells (glial cells) to 2.45 GHz radiofrequency radiation at power levels up to 10 times higher than current safety limits for up to 24 hours. They used advanced genetic analysis to look for changes in how genes were expressed, but found no significant alterations. This suggests that even at high exposure levels, this type of RF radiation may not directly damage the genetic machinery of brain cells.

Why This Matters

This study provides reassuring evidence that RF radiation at 2.45 GHz - the same frequency used by WiFi routers and microwave ovens - doesn't appear to disrupt gene expression in brain cells, even at SAR levels up to 10 W/kg. To put that in perspective, current safety limits cap phone radiation at 2 W/kg, meaning these researchers tested exposures five times higher than what regulators consider safe. The researchers used rigorous methodology, initially identifying potential genetic changes through microarray analysis, then validating their findings with more precise PCR testing. What makes this research particularly valuable is that it examined glial cells, which support and protect neurons in your brain. While one study can't definitively prove safety, this adds to a body of research suggesting that RF radiation at these frequencies may not cause the direct genetic damage that some have theorized could lead to cancer or other health problems.

Exposure Details

SAR
1, 5, and 10 W/kg
Source/Device
2.45 GHz
Exposure Duration
1, 4, and 24 h

Exposure Context

This study used 1, 5, and 10 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1, 5, and 10 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 2 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.45 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

We investigated the effects of exposure to RF fields (2.45 GHz, continuous wave) at specific absorption rate (SAR) of 1, 5, and 10 W/kg for 1, 4, and 24 h on gene expression in a normal human glial cell line, SVGp12, using DNA microarray.

Microarray analysis revealed 23 assigned gene spots and 5 non-assigned gene spots as prospective alt...

Under the experimental conditions used in this study, we found no evidence that exposure to RF fields affected gene expression in SVGp12 cells.

Cite This Study
Sakurai T, Kiyokawa T, Narita E, Suzuki Y, Taki M, Miyakoshi J (2011). Analysis of gene expression in a human-derived glial cell line exposed to 2.45 GHz continuous radiofrequency electromagnetic fields J Radiat Res. 52(2):185-192, 2011.
Show BibTeX
@article{t_2011_analysis_of_gene_expression_2802,
  author = {Sakurai T and Kiyokawa T and Narita E and Suzuki Y and Taki M and Miyakoshi J},
  title = {Analysis of gene expression in a human-derived glial cell line exposed to 2.45 GHz continuous radiofrequency electromagnetic fields},
  year = {2011},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/21343680/},
}
PubMed: 21343680

Cited By (52 papers)

View all 52 citing papers on Semantic Scholar

Quick Questions About This Study

A 2011 study found no significant effects on gene expression when human glial cells were exposed to 2.45 GHz radiation for up to 24 hours. Researchers used advanced microarray analysis and validated results with additional testing, showing no meaningful genetic changes even at high exposure levels.
Research exposing human brain cells to 2.45 GHz radiation at power levels up to 10 times higher than current safety limits found no genetic damage. The study used sophisticated gene expression analysis to detect even subtle changes but observed no significant alterations.
Human glial cells showed no gene expression changes after 24 hours of continuous 2.45 GHz exposure in laboratory conditions. Researchers validated their findings using multiple analytical methods, suggesting extended exposure at this frequency may not directly alter genetic machinery.
SVGp12 human glial cells exposed to 2.45 GHz radiofrequency fields showed no significant gene expression alterations. Despite identifying 23 potential gene changes through initial screening, follow-up analysis confirmed no meaningful genetic effects occurred under the experimental conditions tested.
The 2011 study used microarray analysis followed by reverse transcription-polymerase chain reaction validation to ensure accuracy. This dual-method approach provides reliable detection of gene expression changes, making the finding of no significant effects from 2.45 GHz exposure scientifically robust.