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Transcriptomic differences between euryhaline and stenohaline malaria vector sibling species in response to salinity

Hilary A Uyhelji1,2,3, Changde Cheng1,2, Nora J Besansky1,2

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Anopheles merus mosquitoes exhibit greater saltwater tolerance than Anopheles coluzzii, linked to gene expression changes in osmoregulatory pathways. This research aids understanding of malaria vector adaptation to diverse aquatic environments.

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Area of Science:

  • Ecological genomics
  • Molecular biology
  • Malaria vector research

Background:

  • Osmoregulation is crucial for aquatic species transitions.
  • The Anopheles gambiae complex, including Anopheles coluzzii and Anopheles merus, rapidly radiated across Africa.
  • Understanding salinity tolerance mechanisms in these malaria vectors is key to their ecological adaptation.

Purpose of the Study:

  • Investigate gene expression differences between An. coluzzii and An. merus larvae exposed to varying salinity.
  • Identify candidate genes and pathways conferring saltwater tolerance in An. merus.
  • Explore the molecular basis for the radiation of Anopheles mosquitoes into diverse salinity habitats.

Main Methods:

  • RNA-sequencing (RNA-Seq) to compare gene expression profiles.
  • Exposure of larval instars of both species to freshwater (FW) and saltwater (SW).
  • Analysis of differential gene expression in response to salinity stress.

Main Results:

  • Both species showed increased differential gene expression between SW and FW with rising salt concentrations.
  • Identified ion transporters (e.g., AgAE2) involved in osmoregulation.
  • Discovered mitogen-activated protein kinases potentially involved in salinity signaling and cross-talk with immune response.

Conclusions:

  • Gene induction plays a role in mediating salinity tolerance in Anopheles mosquitoes.
  • An. merus possesses enhanced molecular mechanisms for saltwater osmoregulation compared to An. coluzzii.
  • This study advances understanding of the ecological genomics and habitat adaptability of malaria vectors.