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DNA & Genetic Damage389 citations

Magnetic-field-induced DNA strand breaks in brain cells of the rat.

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Lai H, Singh NP · 2004

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Magnetic fields at household levels caused cumulative DNA damage in rat brain cells through iron-mediated free radical formation.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to extremely low-frequency magnetic fields (the type from power lines) at levels commonly found in homes and workplaces. After 24-48 hours of exposure, they found significant DNA damage in brain cells, with longer exposure causing more damage. The study suggests this damage occurs through iron-mediated free radical formation, potentially leading to brain cell death.

Why This Matters

This research is particularly significant because it demonstrates DNA damage at magnetic field levels of 0.01 mT (10 milligauss) - a strength you might encounter living near power lines or using certain household appliances. The fact that the damage was cumulative, increasing with longer exposure times, suggests that chronic exposure to everyday magnetic fields could pose health risks. What makes this study especially compelling is the researchers' identification of the biological mechanism: iron-mediated free radical formation leading to DNA breaks and cell death. The science demonstrates that even relatively low-level magnetic field exposure can trigger oxidative stress pathways in brain tissue. This adds to a growing body of evidence suggesting that our current safety standards, which only consider heating effects, may be inadequate for protecting against biological effects of EMF exposure.

Exposure Details

Magnetic Field
0.01 mG
Source/Device
60-Hz
Exposure Duration
24 hr and 48 h

Exposure Context

This study used 0.01 mG for magnetic 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: 0.01 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the No Concern rangeFCC limit is 200,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 60 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

In the present study, effects of magnetic field exposure on brain cell DNA in the rat were further investigated.

Exposure to a 60-Hz magnetic field at 0.01 mT for 24 hr caused a significant increase in DNA single-...

We hypothesize that exposure to a 60-Hz magnetic field initiates an iron-mediated process (e.g., the Fenton reaction) that increases free radical formation in brain cells, leading to DNA strand breaks and cell death. This hypothesis could have an important implication for the possible health effects associated with exposure to extremely low-frequency magnetic fields in the public and occupational environments.

Cite This Study
Lai H, Singh NP (2004). Magnetic-field-induced DNA strand breaks in brain cells of the rat. Environ Health Perspect. 112(6):687-694, 2004.
Show BibTeX
@article{h_2004_magneticfieldinduced_dna_strand_breaks_405,
  author = {Lai H and Singh NP},
  title = {Magnetic-field-induced DNA strand breaks in brain cells of the rat.},
  year = {2004},
  doi = {10.1289/ehp.6355},
  url = {https://ehp.niehs.nih.gov/doi/abs/10.1289/ehp.6355},
}
DOI: 10.1289/ehp.6355

Cited By (389 papers)

View all 389 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, research by Lai and Singh found that 60 Hz magnetic fields at 0.01 mT caused significant DNA strand breaks in rat brain cells. The damage increased with longer exposure times, suggesting cumulative effects from power line frequencies commonly found in homes.
DNA damage in brain cells occurred after 24 hours of 60 Hz magnetic field exposure, with significantly more damage after 48 hours. This demonstrates that power line EMF effects are cumulative and worsen with prolonged exposure duration.
Yes, the study found that iron chelators blocked magnetic field-induced DNA damage, suggesting iron plays a key role. Researchers believe 60 Hz fields trigger iron-mediated free radical formation through the Fenton reaction, leading to brain cell death.
Yes, treatment with Trolox (a vitamin E analog) completely blocked DNA strand breaks caused by 60 Hz magnetic fields. This suggests antioxidants may help protect brain cells from power line EMF exposure by neutralizing harmful free radicals.
Research shows 60 Hz magnetic fields at levels found in homes increased both apoptosis and necrosis in rat brain cells. The study suggests this occurs through iron-mediated free radical formation that damages DNA and kills neurons.