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Evolutionary Genetics of Borrelia.

Zachary J Oppler1, Kayleigh R O'Keeffe1, Karen D McCoy2

  • 1Department of Biology, University of Pennsylvania, 433 South University Ave, Philadelphia, PA 19104, USA.

Current Issues in Molecular Biology
|December 8, 2020
PubMed
Summary

Borrelia bacteria, diverse spirochetes causing diseases, are classified into Lyme borreliosis and relapsing fever clades. Integrating molecular and ecological studies is key to understanding Borrelia

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • The genus Borrelia comprises diverse, vector-borne spirochetes responsible for various human and animal diseases.
  • These bacteria are broadly categorized into two main evolutionary groups: the Lyme borreliosis clade and the relapsing fever clade.
  • Complex transmission cycles involving multiple hosts and arthropod vectors characterize Borrelia species.

Purpose of the Study:

  • To integrate findings from molecular, ecological, and evolutionary studies to understand Borrelia's genetic diversity.
  • To identify the evolutionary drivers and consequences of genetic variation within and between Borrelia species.
  • To connect molecular interactions with ecological processes shaping Borrelia evolution and diversification.

Main Methods:

  • Review of recent findings on evolutionary genetics of both Borrelia clades.
  • Analysis of molecular and genetic adaptations influencing Borrelia lifecycle and transmission.
  • Examination of ecological interactions between Borrelia, hosts, and vectors.

Main Results:

  • Molecular studies reveal adaptations for Borrelia fitness and transmission but offer limited insight into evolutionary pressures.
  • Ecological studies highlight host-vector interactions impacting Borrelia distribution and abundance but not the underlying genetic basis.
  • Integration of studies is necessary to fully comprehend Borrelia's evolutionary trajectory.

Conclusions:

  • Understanding Borrelia's evolutionary genetics requires synthesizing molecular and ecological data.
  • Connecting molecular mechanisms to ecological contexts is crucial for explaining Borrelia diversification.
  • Further research integrating diverse study approaches will elucidate the distribution of genetic and molecular variation in Borrelia species.