Oocyte destruction is activated during viral infection

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Travis C Thomson1, Anette Schneemann, Joshua Johnson

  • 1Department of Obstetrics, Gynecology, and Reproductive Sciences/Division of Reproductive Endocrinology and Infertility, Yale School of Medicine, New Haven, Connecticut, USA.

Genesis (New York, N.Y. : 2000)
|December 17, 2011
PubMed

Insights

Viral infection causes a starvation-like state in fruit flies, significantly reducing egg production by disrupting oogenesis. This study reveals a novel host-virus interaction affecting fly populations.

Area of Science:

  • Virology
  • Developmental Biology
  • Genetics

Background:

  • Viral infections can induce physiological changes mimicking starvation.
  • Starvation and TOR kinase inhibition impair oocyte production in Drosophila melanogaster.
  • Viral infection's impact on oogenesis was previously uncharacterized.

Purpose of the Study:

  • To investigate the hypothesis that viral infection compromises oogenesis in Drosophila.
  • To elucidate the mechanisms underlying viral-induced oocyte destruction.
  • To identify host factors involved in viral pathogenesis and oogenesis.

Main Methods:

  • Wild-type fruit flies were infected with flock house virus (FHV).
  • Survival, embryo production, and Akt/TOR signaling were monitored.
  • Oogenesis was assessed in wild-type and mutant flies (discs large, merlin, chc, synaptotagmin).

Main Results:

  • FHV infection caused a dose-dependent reduction in fecundity and Akt/TOR signaling.
  • Mid-oogenesis egg chamber destruction was observed, with FHV protein detected in developing egg chambers.
  • Oogenesis was partially rescued in discs large and merlin mutants, and fully rescued in chc mutants, but not synaptotagmin mutants.

Conclusions:

  • Viral infection disrupts Drosophila oogenesis through a mechanism involving Akt/TOR signaling.
  • Host-virus interaction mechanisms controlling fly survival and egg chamber survival are distinct.
  • This study identifies novel genetic and signaling pathways in a host-virus interaction impacting fly populations.

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