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Genetic analysis of cryptochrome in insect magnetosensitivity

2022 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 743

This review summarizes evidence that insect magnetosensitivity involves cryptochromes (CRYs), with physico-chemical studies suggesting a photoactivated FAD–tryptophan radical-pair mechanism whose spin chemistry is sensitive to magnetic fields. It describes ge…

Study snapshot

Publicationmanual · 2022
Study typereview
Reported directionUnclear
Evidence ratingInsufficient

Abstract

Genetic analysis of cryptochrome in insect magnetosensitivity Kyriacou CP, Rosato E. Genetic analysis of cryptochrome in insect magnetosensitivity. Front Physiol. 2022 Aug 10;13:928416. doi: 10.3389/fphys.2022.928416. Abstract The earth's magnetic field plays an important role in the spectacular migrations and navigational abilities of many higher animals, particularly birds. However, these organisms are not amenable to genetic analysis, unlike the model fruitfly, Drosophila melanogaster, which can respond to magnetic fields under laboratory conditions. We therefore review the field of insect magnetosensitivity focusing on the role of the Cryptochromes (CRYs) that were first identified in Arabidopsis and Drosophila as key molecular components of circadian photo-entrainment pathways. Physico-chemical studies suggest that photo-activation of flavin adenine dinucleotide (FAD) bound to CRY generates a FADo- Trpo+ radical pair as electrons skip along a chain of specific Trp residues and that the quantum spin chemistry of these radicals is sensitive to magnetic fields. The manipulation of CRY in several insect species has been performed using gene editing, replacement/rescue and knockdown methods. The effects of these various mutations on magnetosensitivity have revealed a number of surprises that are discussed in the light of recent developments from both in vivo and in vitro studies. Open access paper: frontiersin.org

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 typereview
Effect directionunclear
PopulationInsects (including Drosophila melanogaster; several insect species referenced)
Sample sizeNot supplied
ExposureNot supplied
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

This review summarizes evidence that insect magnetosensitivity involves cryptochromes (CRYs), with physico-chemical studies suggesting a photoactivated FAD–tryptophan radical-pair mechanism whose spin chemistry is sensitive to magnetic fields. It describes genetic manipulations of CRY across several insect species and discusses that resulting effects on magnetosensitivity include "a number of surprises" in light of recent in vivo and in vitro developments.

Outcomes measured

  • Magnetosensitivity
  • Navigation/migration-related magnetic field responses (general)
  • Cryptochrome (CRY) involvement in magnetic-field sensitivity
  • Effects of CRY genetic manipulation (gene editing, replacement/rescue, knockdown) on magnetosensitivity

Limitations

  • Narrative review; no primary experimental results or quantitative effect estimates reported in the abstract
  • Specific magnetic-field exposure parameters (e.g., field strength, frequency characteristics) are not provided in the abstract
  • No sample sizes or detailed methods for the referenced genetic studies are provided in the abstract
View raw extracted JSON
{
  "study_type": "review",
  "exposure": {
    "band": null,
    "source": "earth's magnetic field",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Insects (including Drosophila melanogaster; several insect species referenced)",
  "sample_size": null,
  "outcomes": [
    "Magnetosensitivity",
    "Navigation/migration-related magnetic field responses (general)",
    "Cryptochrome (CRY) involvement in magnetic-field sensitivity",
    "Effects of CRY genetic manipulation (gene editing, replacement/rescue, knockdown) on magnetosensitivity"
  ],
  "main_findings": "This review summarizes evidence that insect magnetosensitivity involves cryptochromes (CRYs), with physico-chemical studies suggesting a photoactivated FAD–tryptophan radical-pair mechanism whose spin chemistry is sensitive to magnetic fields. It describes genetic manipulations of CRY across several insect species and discusses that resulting effects on magnetosensitivity include \"a number of surprises\" in light of recent in vivo and in vitro developments.",
  "effect_direction": "unclear",
  "limitations": [
    "Narrative review; no primary experimental results or quantitative effect estimates reported in the abstract",
    "Specific magnetic-field exposure parameters (e.g., field strength, frequency characteristics) are not provided in the abstract",
    "No sample sizes or detailed methods for the referenced genetic studies are provided in the abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "magnetosensitivity",
    "cryptochrome",
    "CRY",
    "Drosophila melanogaster",
    "insects",
    "earth's magnetic field",
    "FAD",
    "radical pair",
    "quantum spin chemistry",
    "circadian photo-entrainment",
    "gene editing",
    "knockdown",
    "rescue"
  ],
  "suggested_hubs": [
    {
      "slug": "other",
      "weight": 0.2,
      "reason": "Focuses on biological magnetoreception mechanisms (cryptochrome/radical-pair) rather than human-made EMF exposures or policy."
    }
  ]
}
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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: 10.3389/fphys.2022.928416
PubMed: Not supplied

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