Hypomagnetic Fields Influence the Developmental Duration, Fecundity and Temperature Stress Resistance of Drosophila melanogaster via Frataxin-Associated Traits

Abstract

Frataxin is a highly conserved mitochondrial protein that plays a key role in iron homeostasis and metabolism, and its deficiency leads to oxidative stress, mitochondrial dysfunction, and neurodegeneration. Hypomagnetic fields (HMF) can lead to various biological effects including increased oxidative stress, neurological and developmental disorders; yet, their effects acting as environmental stressors that exacerbate the inherent metabolic vulnerabilities in frataxin-deficient Drosophila melanogaster flies are still unknown. In this study, the bio-effects of HMF on growth, development, reproduction, and temperature stress resistance of frataxin-silenced flies were investigated. The results showed that HMF extended egg-to-adult and pupa developmental durations of both the control line of repo-GAL4; tub-GAL80^ts>GFP-RNAi (GFP-RNAi) and frataxin-deficient line of repo-GAL4; tub-GAL80^ts>fh RNAi (fh-RNAi) compared to those reared under a geomagnetic field (GMF). Compared with GMF, HMF significantly increased offspring fecundity in fh-RNAi flies, whereas the change in GFP-RNAi controls was not significant, while showing no significant effects on the adult weight of fh-RNAi flies. The impact of HMF on temperature stress resistance was particularly specific: it enhanced recovery from chill coma in control (GFP-RNAi) flies, while it accelerated recovery from heat shock in frataxin-silenced (fh-RNAi) flies. The mechanisms through which HMF modulate frataxin-associated phenotypes at a fundamental physical level warrant further investigation.

AI evidence extraction

Main findings

Compared with geomagnetic field conditions, hypomagnetic fields extended egg-to-adult and pupa developmental durations in both control and frataxin-deficient flies. HMF significantly increased offspring fecundity in frataxin-silenced flies but not controls, had no significant effect on adult weight of frataxin-silenced flies, enhanced chill-coma recovery in controls, and accelerated heat-shock recovery in frataxin-silenced flies.

Outcomes measured

• egg-to-adult developmental duration
• pupa developmental duration
• offspring fecundity
• adult weight
• temperature stress resistance
• chill coma recovery
• heat shock recovery

Limitations

• Abstract does not report sample size.
• Exposure intensity and duration are not specified in the abstract.
• Mechanisms were not established and were stated to warrant further investigation.

{
    "study_type": "animal",
    "exposure": {
        "band": "static magnetic field",
        "source": "hypomagnetic field",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": "Drosophila melanogaster flies, including control GFP-RNAi and frataxin-silenced fh-RNAi lines",
    "sample_size": null,
    "outcomes": [
        "egg-to-adult developmental duration",
        "pupa developmental duration",
        "offspring fecundity",
        "adult weight",
        "temperature stress resistance",
        "chill coma recovery",
        "heat shock recovery"
    ],
    "main_findings": "Compared with geomagnetic field conditions, hypomagnetic fields extended egg-to-adult and pupa developmental durations in both control and frataxin-deficient flies. HMF significantly increased offspring fecundity in frataxin-silenced flies but not controls, had no significant effect on adult weight of frataxin-silenced flies, enhanced chill-coma recovery in controls, and accelerated heat-shock recovery in frataxin-silenced flies.",
    "effect_direction": "mixed",
    "limitations": [
        "Abstract does not report sample size.",
        "Exposure intensity and duration are not specified in the abstract.",
        "Mechanisms were not established and were stated to warrant further investigation."
    ],
    "evidence_strength": "low",
    "confidence": 0.88000000000000000444089209850062616169452667236328125,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "hypomagnetic field",
        "geomagnetic field",
        "Drosophila melanogaster",
        "frataxin",
        "developmental duration",
        "fecundity",
        "temperature stress resistance",
        "oxidative stress",
        "mitochondria"
    ],
    "suggested_hubs": []
}

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