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Related Experiment Video

Updated: Mar 18, 2026

Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing

Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing

Published on: August 25, 2018

Comparative genomics reveals multiple pathways to mutualism for tick-borne pathogens.

Svetlana Lockwood¹, Kelly A Brayton^2,3, Shira L Broschat^4,5,6

¹School of Electrical Engineering and Computer Science, Washington State University, P.O. Box 642752, Pullman, USA.

|July 3, 2016

Summary

The ability of pathogens to infect hosts via ticks evolved multiple times, not just once. This comprehensive genomic study analyzed tick-borne bacteria, revealing distinct genetic patterns for tick transmission.

Keywords:

Comparative genomics Phylogenomic network Tick-borne pathogens

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Published on: October 31, 2025

Area of Science:

Microbiology
Evolutionary Biology
Genomics

Background:

Many human and livestock pathogens rely on ticks for transmission.
The evolutionary origin of tick-borne transmission is not well understood.

Purpose of the Study:

To investigate whether tick transmission evolved once or multiple times.
To analyze the genetic basis of tick transmissibility in bacterial pathogens.

Main Methods:

Comparative genomics analysis of 102 bacterial genomes.
Inclusion of pathogens from seven genera (Borrelia, Rickettsia, Anaplasma, Ehrlichia, Francisella, Coxiella, Bartonella).
Analysis of bacteria transmitted by ticks, lice, and fleas.

Main Results:

No single gene or metabolic pathway was found in all tick-borne bacteria.
Identified specific genes and pathways present in some tick-transmitted bacteria but absent in louse- or flea-transmitted ones.
The study analyzed over 120,000 protein sequences.

Conclusions:

Tick-borne pathogen transmission likely evolved independently on multiple occasions.
This is the most extensive study to date on the evolution of tick transmissibility.
Genomic analysis provides insights into the diverse evolutionary strategies of tick-borne pathogens.