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Brain & Nervous System152 citations

Exposure of rat brain to 915 MHz GSM microwaves induces changes in gene expression but not double stranded DNA breaks or effects on chromatin conformation.

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Belyaev IY, Koch CB, Terenius O, Roxstrom-Lindquist K, Malmgren LO, H Sommer W, Salford LG, Persson BR. · 2006

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Cell phone radiation altered brain gene expression in just 2 hours at exposure levels considered safe by current standards.

Plain English Summary

Summary written for general audiences

Scientists exposed rats to cell phone radiation at 915 MHz for 2 hours and found it changed gene activity in the brain without causing DNA breaks. The radiation altered the expression of 12 genes involved in brain functions like neurotransmitter regulation, the blood-brain barrier, and melatonin production. This suggests that even brief cell phone exposure can trigger biological changes in brain cells, even when DNA damage isn't detectable.

Why This Matters

This study reveals something crucial that the wireless industry doesn't want you to know: your brain responds to cell phone radiation even when there's no obvious DNA damage. The researchers found that just 2 hours of exposure at 0.4 mW/g SAR (well below current safety limits) was enough to alter gene expression in rat brains. What makes this particularly significant is that the affected genes control critical brain functions including the blood-brain barrier, which protects your brain from toxins, and melatonin production, which regulates your sleep cycle. The science demonstrates that biological effects occur at exposure levels far below what regulators consider 'safe.' You don't have to wait for DNA breaks to be concerned about what cell phone radiation is doing to your brain.

Exposure Details

SAR
0.4 W/kg
Source/Device
915 MHz
Exposure Duration
2 hours

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.4 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern rangeFCC limit is 4x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 915 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 915 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

We investigated whether exposure of rat brain to microwaves (MWs) of global system for mobile communication (GSM) induces DNA breaks, changes in chromatin conformation and in gene expression.

An exposure installation was used based on a test mobile phone employing a GSM signal at 915 MHz, al...

In cerebellum from all exposed animals, 11 genes were upregulated in a range of 1.34-2.74 fold and o...

The data shows that GSM MWs at 915 MHz did not induce PFGE-detectable DNA double stranded breaks or changes in chromatin conformation, but affected expression of genes in rat brain cells.

Cite This Study
Belyaev IY, Koch CB, Terenius O, Roxstrom-Lindquist K, Malmgren LO, H Sommer W, Salford LG, Persson BR. (2006). Exposure of rat brain to 915 MHz GSM microwaves induces changes in gene expression but not double stranded DNA breaks or effects on chromatin conformation. Bioelectromagnetics.27(4):295-306,2006.
Show BibTeX
@article{iy_2006_exposure_of_rat_brain_855,
  author = {Belyaev IY and Koch CB and Terenius O and Roxstrom-Lindquist K and Malmgren LO and H Sommer W and Salford LG and Persson BR.},
  title = {Exposure of rat brain to 915 MHz GSM microwaves induces changes in gene expression but not double stranded DNA breaks or effects on chromatin conformation.},
  year = {2006},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/16511873/},
}
PubMed: 16511873

Cited By (152 papers)

View all 152 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, a 2006 study found that 915 MHz GSM radiation changed the expression of 12 genes in rat brain tissue after just 2 hours of exposure. Eleven genes were upregulated and one was downregulated, affecting neurotransmitter regulation, blood-brain barrier function, and melatonin production without causing detectable DNA breaks.
Research shows that just 2 hours of 915 MHz GSM exposure can alter brain gene activity. Scientists found changes in 12 genes in rat cerebellum tissue, with expression levels ranging from 1.34 to 2.74-fold increases for upregulated genes, demonstrating that brief exposures can trigger biological responses.
No, a 2006 study found that 915 MHz GSM radiation did not cause detectable DNA double-strand breaks or changes in chromatin structure in rat brain cells. However, the same exposure did alter gene expression, showing that biological effects can occur without direct DNA damage.
915 MHz GSM radiation affects genes controlling multiple brain functions including neurotransmitter regulation, blood-brain barrier integrity, and melatonin production. A 2006 rat study identified 12 genes with altered expression levels after 2-hour exposure, suggesting impacts on sleep regulation and brain protection mechanisms.
Brain gene expression changes can occur within 2 hours of GSM radiation exposure. Research using 915 MHz frequencies found significant alterations in 12 genes in rat cerebellum tissue after this brief exposure period, with some genes showing nearly 3-fold increases in activity levels.