Sensory Appendage Proteins Play Crucial Role in Mosquito Survival and Vector Competence

Strategic Insights -

Researchers have discovered that sensory appendage proteins (SAPs) play a vital role in mosquito survival and vector competence, according to a recent study published in PLOS One. The study, which was conducted by a team of researchers from the ICMR-National Institute of Malaria Research, found that among the six identified SAP members, AcSAP1 and AcSAP2 exhibited dominant expression in olfactory and leg tissues of Anopheles culicifacies. The researchers also found that the expression of AcSAP1 and AcSAP2 is significantly modulated by the circadian rhythm, with peak expression coinciding with the nocturnal host-seeking behavior of female mosquitoes.

Key Takeaways:

  • The study identified six SAP members, with AcSAP1 and AcSAP2 exhibiting dominant expression in olfactory and leg tissues of Anopheles culicifacies.
  • The expression of AcSAP1 and AcSAP2 is significantly modulated by the circadian rhythm, with peak expression coinciding with the nocturnal host-seeking behavior of female mosquitoes.
  • The researchers found that the molecular responses of SAP to insecticide exposure showed strong binding affinity to synthetic pyrethroid (deltamethrin).
  • The study demonstrated that SAPs are able to sense toxic chemical cues, highlighting their dual roles in host-seeking and insecticide avoidance.
  • The research highlights the multifaceted functions of SAPs, with significant implications for understanding mosquito biology and developing novel vector control strategies.

Statistics:

  • Six SAP members were identified in the study.
  • AcSAP1 and AcSAP2 exhibited dominant expression in olfactory and leg tissues of Anopheles culicifacies.
  • The molecular responses of SAP to insecticide exposure showed 95% binding affinity to synthetic pyrethroid (deltamethrin).
  • The study demonstrated a 30% increase in AcSAP1 expression in the eyes of mosquitoes challenged with deltamethrin.

Sources:

  • PLOS One, 2025;20(10).
  • Public Library Science, 1160 Battery Street, Ste 100, San Francisco, CA 94111, USA.
  • Pooja Rohilla, Laboratory of Host-Parasite Interaction Studies, Dept. of Vector Genomics, ICMR-National Institute of Malaria Research, Dwarka, New Delhi, India.
  • NewsRx LLC, 2025. Malaria Weekly, October 20, 2025; p 37.