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DNA & Genetic Damage

Micronucleus frequency in erythrocytes of mice after long-term exposure to radiofrequency radiation.

No Effects Found

Juutilainen J, Heikkinen P, Soikkeli H, Mäki-Paakkanen J. · 2007

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This study found no DNA damage in mice after 78 weeks of cell phone radiation exposure at human-relevant levels.

Plain English Summary

Summary written for general audiences

Finnish researchers exposed mice to cell phone radiation for over a year to test whether it damages DNA by looking for micronuclei (broken chromosome fragments) in blood cells. They found no DNA damage from radiofrequency exposure at levels similar to what humans experience from mobile phones. This was true across different phone technologies (analog and digital), exposure durations (52-78 weeks), and mouse strains.

Why This Matters

This study represents one of the more comprehensive examinations of RF radiation's potential to cause genetic damage, testing multiple phone technologies over extended periods that mirror long-term human use. The SAR levels tested (0.35-1.5 W/kg) span the range of typical mobile phone exposures, with 1.5 W/kg being close to regulatory limits. While the lack of observable DNA damage might seem reassuring, it's worth noting that micronucleus formation represents just one type of genetic damage, and other mechanisms of cellular harm may not be captured by this particular test. The science demonstrates that RF effects on biological systems are complex, and no single study can definitively resolve questions about long-term health impacts. What this means for you is that while this research doesn't show DNA damage from phone-level RF exposure, it doesn't address other potential biological effects that researchers continue to investigate.

Exposure Details

SAR
1.5 W/kg
Source/Device
902.5 MHz
Exposure Duration
78 weeks (1.5 h/d, 5 d/week)

Exposure Context

This study used 1.5 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 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 1 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 902.5 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 902.5 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of the study was to investigate genotoxicity of long-term exposure to radiofrequency (RF) electromagnetic fields by measuring micronuclei in erythrocytes. The blood samples were collected in two animal studies evaluating possible cocarcinogenic effects of RF fields.

In study A, female CBA/S mice were exposed for 78 weeks (1.5 h/d, 5 d/week) to either a continuous 9...

The results did not show any effects of RF fields on micronucleus frequency in polychromatic or norm...

Cite This Study
Juutilainen J, Heikkinen P, Soikkeli H, Mäki-Paakkanen J. (2007). Micronucleus frequency in erythrocytes of mice after long-term exposure to radiofrequency radiation. Int J Radiat Biol. 83(4):213-220, 2007.
Show BibTeX
@article{j_2007_micronucleus_frequency_in_erythrocytes_3124,
  author = {Juutilainen J and Heikkinen P and Soikkeli H and Mäki-Paakkanen J.},
  title = {Micronucleus frequency in erythrocytes of mice after long-term exposure to radiofrequency radiation.},
  year = {2007},
  doi = {10.1080/09553000601169800},
  url = {https://www.tandfonline.com/doi/abs/10.1080/09553000601169800?journalCode=irab20},
}
DOI: 10.1080/09553000601169800

Cited By (35 papers)

Quick Questions About This Study

No, Finnish researchers found no DNA damage in mouse blood cells after over a year of exposure to 902.5 MHz radiation. The study tested multiple phone technologies, exposure durations up to 78 weeks, and different mouse strains with consistent negative results.
Yes, micronuclei testing can detect chromosome damage, but this Finnish study found no increase in micronuclei frequency in mouse blood cells after long-term 902.5 MHz exposure. This suggests cell phone radiation didn't cause detectable chromosome breaks.
Researchers exposed mice to 902.5 MHz cell phone radiation for 52 to 78 weeks (over a year). This long-term study design allowed scientists to detect potential DNA damage that might accumulate over extended exposure periods.
Neither analog nor digital cell phone signals affected DNA in this Finnish study. Researchers tested three different mobile signal types at 902.5 MHz and found no micronucleus formation in mouse blood cells regardless of signal format.
The study tested three different SAR (specific absorption rate) levels relevant to human mobile phone exposure, though exact values weren't specified. All tested levels produced no DNA damage in mouse blood cells after long-term exposure.