Lyme disease transmission by severely impaired ticks

Open Biol. 2022 Feb;12(2):210244. doi: 10.1098/rsob.210244. Epub 2022 Feb 16.


It has been demonstrated that impairing protein synthesis using drugs targeted against tRNA amino acid synthetases presents a promising strategy for the treatment of a wide variety of parasitic diseases, including malaria and toxoplasmosis. This is the first study evaluating tRNA synthetases as potential drug targets in ticks. RNAi knock-down of all tested tRNA synthetases had a strong deleterious phenotype on Ixodes ricinus feeding. Our data indicate that tRNA synthetases represent attractive, anti-tick targets warranting the design of selective inhibitors. Further, we tested whether these severely impaired ticks were capable of transmitting Borrelia afzelii spirochaetes. Interestingly, biologically handicapped I. ricinus nymphs transmitted B. afzelii in a manner quantitatively sufficient to develop a systemic infection in mice. These data suggest that initial blood-feeding, despite the incapability of ticks to fully feed and salivate, is sufficient for activating B. afzelii from a dormant to an infectious mode, enabling transmission and dissemination in host tissues.

Keywords: Borrelia; Lyme disease; borreliosis; tRNA synthetase; tick; transmission.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acaricides / pharmacology*
  • Amino Acyl-tRNA Synthetases / antagonists & inhibitors
  • Amino Acyl-tRNA Synthetases / genetics
  • Animals
  • Borrelia burgdorferi Group
  • Drug Development
  • Humans
  • Lyme Disease / drug therapy
  • Lyme Disease / microbiology
  • Lyme Disease / transmission*
  • Protein Biosynthesis / drug effects
  • Ticks / drug effects*
  • Ticks / microbiology*


  • Acaricides
  • Amino Acyl-tRNA Synthetases