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C. elegans ageing is accelerated by a self-destructive reproductive programme.

Carina C Kern1, Shivangi Srivastava1, Marina Ezcurra1,2

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Summary
This summary is machine-generated.

The nematode C. elegans exhibits reproductive death, a suicidal reproductive effort, where somatic tissues support yolk production for offspring. Germline removal significantly extends lifespan, supporting this reproductive death hypothesis.

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Area of Science:

  • Gerontology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Post-reproductive C. elegans repurpose somatic biomass for yolk production, which is vented for larval progeny.
  • This process resembles the suicidal reproductive effort (reproductive death) seen in semelparous organisms like Pacific salmon.

Purpose of the Study:

  • To investigate if C. elegans exhibits reproductive death.
  • To compare reproductive strategies and aging in sibling species pairs of Caenorhabditis and Pristionchus genera, including hermaphrodites and females.

Main Methods:

  • Comparative analysis of C. elegans and Pristionchus species.
  • Observation of yolk venting and pathology in hermaphrodites and females.
  • Germline removal experiments in C. elegans hermaphrodites to assess lifespan and pathology.

Main Results:

  • Yolk venting and early pathology with anatomical changes were observed exclusively in hermaphrodites.
  • Hermaphrodites exhibited shorter lifespans compared to females.
  • Germline removal in hermaphrodites suppressed senescent pathology and significantly increased lifespan.

Conclusions:

  • The findings support the hypothesis that C. elegans exhibits reproductive death, suppressed by germline ablation.
  • This suggests a significant divergence in the aging process between C. elegans and most higher organisms.
  • The reproductive death hypothesis may explain the observed plasticity in C. elegans aging.