RF Safe

Transcriptomic and Long-Term Behavioral Deficits Associated with Developmental 3.5 GHz Radiofrequency Radiation Exposures in Zebrafish

2022 · Harm · Low evidence

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HarmLow evidencePaper 845

With 3.5 GHz RFR exposure from 6 hpf to 48 hpf, the authors report no teratogenic effects but subtle hypoactivity in a startle response assay. mRNA sequencing at 48 hpf found modest transcriptomic disruption (28 differentially expressed genes) and KEGG analys…

Study snapshot

Publicationmanual · 2022
Study typeanimal
Reported directionHarm
Evidence ratingLow

Abstract

Transcriptomic and Long-Term Behavioral Deficits Associated with Developmental 3.5 GHz Radiofrequency Radiation Exposures in Zebrafish Subham Dasgupta, Connor Leong, Michael T Simonich, Lisa Truong, Huaping Liu, Robyn L Tanguay. Transcriptomic and Long-Term Behavioral Deficits Associated with Developmental 3.5 GHz Radiofrequency Radiation Exposures in Zebrafish. Environ Sci Technol Lett. 2022 Apr 12;9(4):327-332. doi: 10.1021/acs.estlett.2c00037. Abstract The rapid deployment of the fifth-generation (5G) spectrum by the telecommunication industry is intended to promote better connectivity and data integration among various industries. However, concerns among the public about the safety and health effects of radiofrequency radiations (RFRs) emitted from the newer- generation cell phone frequencies remain, partly due to the lack of robust scientific data. Previously, we used developmental zebrafish to model the bioactivity of 3.5 GHz RFR, a frequency used by 5G-enabled cell phones, in a novel RFR exposure chamber. With RFR exposures from 6 h post-fertilization (hpf) to 48 hpf, we observed that, despite no teratogenic effects, embryos showed subtle hypoactivity in a startle response behavior assay, suggesting abnormal sensorimotor behavior. This study builds upon the previous one by investigating the transcriptomic basis of RFR-associated behavior effects and their persistence into adulthood. Using mRNA sequencing, we found a modest transcriptomic disruption at 48 hpf, with 28 differentially expressed genes. KEGG pathway analysis showed that biochemical pathways related to metabolism were significantly perturbed. Embryos were grown to adulthood, and then a battery of behavioral assays suggested subtle but significant abnormal responses in RFR-exposed fish across the different assays evaluated that suggest potential long-term behavioral effects. Overall, our study suggests the impacts of RFRs on the developing brain, behavior, and the metabolome should be further explored. Open access paper: ncbi.nlm.nih.gov

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeanimal
Effect directionharm
PopulationDevelopmental zebrafish (embryos) followed to adulthood
Sample sizeNot supplied
ExposureRF · 3500 MHz · 6 h post-fertilization (hpf) to 48 hpf (developmental exposure)
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

With 3.5 GHz RFR exposure from 6 hpf to 48 hpf, the authors report no teratogenic effects but subtle hypoactivity in a startle response assay. mRNA sequencing at 48 hpf found modest transcriptomic disruption (28 differentially expressed genes) and KEGG analysis indicated significant perturbation of metabolism-related pathways. Fish raised to adulthood showed subtle but significant abnormal behavioral responses across multiple assays, suggesting potential long-term behavioral effects.

Outcomes measured

  • Teratogenic effects
  • Startle response behavior (hypoactivity)
  • mRNA sequencing / transcriptomic disruption (differentially expressed genes)
  • KEGG pathway perturbations (metabolism-related pathways)
  • Adult behavioral assay battery (long-term behavioral responses)

Limitations

  • Specific exposure metrics (e.g., SAR) not reported in the abstract
  • Sample size not reported in the abstract
  • Details of exposure intensity/dosimetry and behavioral assay methods not provided in the abstract
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "5G-enabled cell phone frequencies",
    "frequency_mhz": 3500,
    "sar_wkg": null,
    "duration": "6 h post-fertilization (hpf) to 48 hpf (developmental exposure)"
  },
  "population": "Developmental zebrafish (embryos) followed to adulthood",
  "sample_size": null,
  "outcomes": [
    "Teratogenic effects",
    "Startle response behavior (hypoactivity)",
    "mRNA sequencing / transcriptomic disruption (differentially expressed genes)",
    "KEGG pathway perturbations (metabolism-related pathways)",
    "Adult behavioral assay battery (long-term behavioral responses)"
  ],
  "main_findings": "With 3.5 GHz RFR exposure from 6 hpf to 48 hpf, the authors report no teratogenic effects but subtle hypoactivity in a startle response assay. mRNA sequencing at 48 hpf found modest transcriptomic disruption (28 differentially expressed genes) and KEGG analysis indicated significant perturbation of metabolism-related pathways. Fish raised to adulthood showed subtle but significant abnormal behavioral responses across multiple assays, suggesting potential long-term behavioral effects.",
  "effect_direction": "harm",
  "limitations": [
    "Specific exposure metrics (e.g., SAR) not reported in the abstract",
    "Sample size not reported in the abstract",
    "Details of exposure intensity/dosimetry and behavioral assay methods not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "zebrafish",
    "radiofrequency radiation",
    "RFR",
    "3.5 GHz",
    "5G",
    "developmental exposure",
    "transcriptomics",
    "mRNA sequencing",
    "behavior",
    "startle response",
    "KEGG",
    "metabolism",
    "long-term effects"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.72,
      "reason": "Study explicitly examines 3.5 GHz, described as a frequency used by 5G-enabled cell phones."
    }
  ]
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1021/acs.estlett.2c00037
PubMed: Not supplied

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