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Are ticks venomous animals?

Alejandro Cabezas-Cruz1, James J Valdés2

  • 1Center for Infection and Immunity of Lille (CIIL), INSERM U1019 - CNRS UMR 8204, Université Lille Nord de France, Institut Pasteur de Lille, Lille, France ; SaBio. Instituto de Investigación de Recursos Cinegéticos, IREC-CSIC-UCLM-JCCM, Ciudad Real 13005, Spain.

Frontiers in Zoology
|July 10, 2014
PubMed
Summary
This summary is machine-generated.

Ticks possess venomous properties due to salivary proteins homologous to those in other venomous animals. This research suggests reconsidering ticks as venomous ectoparasites, impacting disease vector understanding.

Keywords:
ConvergencePathogensSecreted proteinsTicksToxicosesVenom

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Area of Science:

  • Zoology
  • Toxicology
  • Evolutionary Biology

Background:

  • Ticks are haematophagous ectoparasites and vectors for numerous diseases.
  • Despite possessing venom-like proteins and inducing toxicoses, ticks are rarely considered venomous.
  • Tick saliva functions in blood feeding, counteracting host defenses, similar to venom action.

Purpose of the Study:

  • To provide evidence for reconsidering the venomous nature of tick saliva.
  • To compare tick salivary components with venoms from recognized venomous taxa.
  • To investigate the evolutionary aspects of venoms in Arachnida.

Main Methods:

  • Extensive literature mining.
  • In silico research and comparative analysis of salivary proteins.
  • Comparison of immune responses to tick saliva and other venoms.
  • Molecular comparison between tick saliva and human saliva.

Main Results:

  • Tick salivary proteins show homology to proteins in scorpion, spider, snake, platypus, and bee venoms.
  • Structural and functional convergence exists between tick saliva components and other venoms.
  • Immune responses to tick saliva and venoms share an allergic immunity background.
  • Tick saliva composition more closely resembles venomous animal saliva than non-venomous animal saliva.

Conclusions:

  • Ticks exhibit characteristics aligning them with venomous taxa.
  • Tick saliva contains venom-like proteins with functional similarities to known venoms.
  • Ticks should be classified as venomous ectoparasites due to their salivary composition and host interactions.