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DNA & Genetic Damage

The toxic effects of mobile phone radiofrequency (940MHz) on the structure of calf thymus DNA.

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Hekmat A, Saboury AA, Moosavi-Movahedi AA. · 2012

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Mobile phone radiation caused permanent DNA structural changes at low exposure levels, suggesting current safety limits may be insufficient.

Plain English Summary

Summary written for general audiences

Researchers exposed DNA samples to mobile phone radiation (940 MHz) and found that the radiation caused permanent structural changes to the DNA molecules. The DNA became less stable, changed shape, and showed signs of damage that persisted even two hours after exposure ended. This suggests that radiofrequency radiation from mobile phones can directly alter DNA structure at the molecular level.

Why This Matters

This laboratory study provides direct evidence that mobile phone radiation can alter DNA structure at exposure levels similar to what you experience during phone calls. The researchers used a SAR of 0.04 W/kg, which is well below current safety limits but still caused measurable and irreversible changes to DNA molecules. What makes this particularly concerning is that the DNA damage persisted hours after exposure ended, suggesting these aren't temporary heating effects but actual structural modifications. While this was a test-tube study rather than living cells, DNA is DNA - and structural changes like these could potentially interfere with normal cellular processes. The science demonstrates that radiofrequency radiation can interact with biological molecules in ways that current safety standards don't account for, adding to the growing body of evidence that our exposure guidelines may be inadequate.

Exposure Details

SAR
0.04 W/kg
Electric Field
15 V/m
Source/Device
940 MHz
Exposure Duration
2 h after 45 min

Exposure Context

This study used 15 V/m for electric fields:

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: 0.04 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Severe Concern rangeFCC limit is 40x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 940 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 940 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to evaluate the possible biological effects of mobile phone RF (940 MHz, 15 V/m and SAR=40 mW/kg) on the structure of calf thymus DNA (ct DNA) immediately after exposure and 2 h after 45 min exposure via diverse range of spectroscopic instruments.

The UV-vis and circular dichroism (CD) experiments depict that mobile phone EMFs can remarkably caus...

Collectively, our results reveal that 940 MHz can alter the structure of DNA. The displacement of electrons in DNA by EMFs may lead to conformational changes of DNA and DNA disaggregation. Results from this study could have an important implication on the health effects of RF-EMFs exposure. In addition, this finding could proffer a novel strategy for the development of next generation of mobile phone.

Cite This Study
Hekmat A, Saboury AA, Moosavi-Movahedi AA. (2012). The toxic effects of mobile phone radiofrequency (940MHz) on the structure of calf thymus DNA. Ecotoxicol Environ Saf. 2012 Nov 16. pii: S0147-6513(12)00368-5. doi: 10.1016/j.ecoenv.2012.10.016.
Show BibTeX
@article{a_2012_the_toxic_effects_of_1021,
  author = {Hekmat A and Saboury AA and Moosavi-Movahedi AA.},
  title = {The toxic effects of mobile phone radiofrequency (940MHz) on the structure of calf thymus DNA.},
  year = {2012},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/23164448/},
}
PubMed: 23164448

Cited By (14 papers)

Quick Questions About This Study

Yes, research shows 940 MHz radiation from mobile phones causes permanent structural changes to DNA molecules. The DNA becomes less stable, changes shape, and shows damage that persists even two hours after exposure ends, indicating irreversible molecular alterations.
Research demonstrates that 940 MHz mobile phone EMF makes DNA thermally unstable compared to unexposed samples. The structural changes persist immediately after exposure and remain detectable two hours later, showing lasting effects on DNA stability.
Studies show 940 MHz radiation increases both the surface charge and size of DNA molecules. Dynamic light scattering experiments reveal that radiofrequency EMF causes DNA expansion and structural modifications at the molecular level.
DNA exposed to 940 MHz mobile phone radiation shows increased fluorescence emission compared to unexposed samples. Researchers attribute this to expansion of the DNA structure caused by electromagnetic field interactions with the molecular framework.
No, DNA conformational changes from 940 MHz EMF are irreversible. Research shows the structural alterations remain identical immediately after exposure and two hours later, indicating permanent damage to the DNA molecular structure.