Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Absence of mutagenic effects of 2.45 GHz radiofrequency exposure in spleen, liver, brain, and testis of lacZ-transgenic mouse exposed in utero.
Ono T, Saito Y, Komura J, Ikehata H, Tarusawa Y, Nojima T, Goukon K, Ohba Y, Wang J, Fujiwara O, Sato R. · 2004
View Original AbstractThis study found no DNA damage from prenatal WiFi-frequency exposure, even at levels higher than typical human use.
Plain English Summary
Researchers exposed pregnant mice to 2.45 GHz radiofrequency radiation (the same frequency used in microwave ovens and WiFi) for 16 hours daily throughout pregnancy, then examined their offspring for DNA mutations in brain, liver, spleen, and reproductive organs. They found no increase in genetic damage compared to unexposed mice, even at radiation levels significantly higher than typical human exposure. This suggests that prenatal RF exposure at these levels does not cause detectable DNA mutations in developing mammals.
Why This Matters
This study provides reassuring evidence that radiofrequency exposure during critical developmental windows may not pose the genetic risks some have feared. The researchers used a robust experimental design, exposing animals to 2.45 GHz radiation at levels well above typical human exposure from WiFi or cell phones, yet found no detectable DNA damage in multiple organ systems. What makes this particularly relevant is the timing of exposure during embryonic development, when cells are rapidly dividing and theoretically most vulnerable to genetic damage. However, we must remember that absence of evidence is not evidence of absence. This single study, while well-designed, represents just one piece of a much larger puzzle. The reality is that our understanding of EMF effects on developing organisms remains incomplete, and prudent precaution during pregnancy remains wise until we have more comprehensive long-term data.
Exposure Details
- SAR
- 0.71 and 4.3 W/kg
- Source/Device
- 2.45 GHz
- Exposure Duration
- 16 hours a day
Exposure Context
This study used 0.71 and 4.3 W/kg for SAR (device absorption):
- 1.8x above the Building Biology guideline of 0.4 W/kg
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 Details
A possible mutagenic effect of 2.45 GHz radiofrequency exposure was examined using lacZ-transgenic MutaTM mice.
Pregnant animals were exposed intermittently at a whole-body averaged specific absorption rate of 0....
Mutation frequencies at the lacZ gene in spleen, liver, brain, and testis were similar to those obse...
The data suggest that the level of radiofrequency exposure studied is not mutagenic when administered in utero in short repeated bursts.
Show BibTeX
@article{t_2004_absence_of_mutagenic_effects_3282,
author = {Ono T and Saito Y and Komura J and Ikehata H and Tarusawa Y and Nojima T and Goukon K and Ohba Y and Wang J and Fujiwara O and Sato R. },
title = {Absence of mutagenic effects of 2.45 GHz radiofrequency exposure in spleen, liver, brain, and testis of lacZ-transgenic mouse exposed in utero.},
year = {2004},
url = {https://www.jstage.jst.go.jp/article/tjem/202/2/202_2_93/_article/-char/ja/},
}