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Ionizing radiation harms wildlife reproduction, particularly in invertebrates. This study reveals life-stage-dependent molecular pathways, like apoptosis and Ras/ERK signaling, underlie radiation-induced reproductive toxicity in Caenorhabditis elegans.

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Area of Science:

  • Environmental toxicology
  • Radiation biology
  • Molecular reproductive toxicology

Background:

  • Wildlife faces reproductive harm from ionizing radiation (IR), impacting population dynamics.
  • Reproduction is the most radiosensitive endpoint in invertebrates, necessitating understanding molecular mechanisms.
  • Previous work indicated life-stage-dependent reproductive decline in Caenorhabditis elegans due to IR.

Purpose of the Study:

  • To precisely identify molecular determinants of IR-induced reproductive toxicity, focusing on gamete number reduction.
  • To analyze conserved molecular pathways (apoptosis, Ras/ERK) for cross-species extrapolation of radiosensitivity.
  • To investigate the life-stage-dependent effects of chronic IR exposure on reproductive pathways.

Main Methods:

  • Chronic exposure of Caenorhabditis elegans to 50 mGy·h-1 gamma IR during embryogenesis, gametogenesis, and full development.
  • Analysis of conserved apoptosis and MAP kinase Ras/ERK (MPK-1) pathways involved in reproduction and stress responses.
  • Functional analysis of apoptosis and assessment of germ cell proliferation and pathway activation.

Main Results:

  • Apoptosis and Ras/ERK pathways exhibit life-stage-dependent activation, accumulating damage from chronic IR exposure.
  • Ras/ERK pathway activation was observed in the gonad's pachytene region but not the ovulation zone.
  • DNA-damage-induced apoptosis caused decreased ovulation rates, while sperm reduction appeared linked to germ cell proliferation speed, not apoptosis.

Conclusions:

  • IR-induced reproductive toxicity in Caenorhabditis elegans is mediated by life-stage-dependent molecular pathways.
  • Apoptosis drives reduced ovulation, but sperm count reduction involves other mechanisms requiring further investigation.
  • Results contribute to understanding sex-specific radiosensitivity and support Adverse Outcome Pathway #396 for IR effects on populations.