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GENETIC VARIATION OF LEPTOTROMBIDIUM (ACARI: TROMBICULIDAE) MITES CARRYING ORIENTIA TSUTSUGAMUSHI, THE BACTERIAL

Motohiko Ogawa1, Nobuhiro Takada2, Shinichi Noda3

  • 1Department of Virology I, National Institute of Infectious Diseases, 1-23-1, Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.

The Journal of Parasitology
|July 27, 2023
PubMed

Insights

DNA barcoding using redesigned primers precisely classifies Leptotrombidium mites, vectors of scrub typhus. This method reveals significant genetic diversity within key species, uncovering previously unidentified subgenotypes.

Area of Science:

  • Genetics
  • Entomology
  • Molecular Biology
  • Public Health

Background:

  • Leptotrombidium mites transmit Orientia tsutsugamushi, the cause of scrub typhus.
  • Accurate identification of Leptotrombidium species is crucial for disease control.
  • Morphological identification of these tiny mites is challenging and requires expertise.

Purpose of the Study:

  • To develop a more precise method for classifying Leptotrombidium mites.
  • To investigate the genetic diversity within important Leptotrombidium species.
  • To improve the detection sensitivity for Leptotrombidium scutellare.

Main Methods:

  • Sequencing of the mitochondrial cytochrome c oxidase subunit 1 (CO1) gene.
  • Modification of the canonical DNA barcoding method with redesigned primers for Leptotrombidium.
  • Phylogenetic analysis to assess genetic distances and relationships.

Main Results:

  • The redesigned DNA barcoding primers increased detection sensitivity for Leptotrombidium scutellare by approximately 17%.
  • Phylogenetic analysis revealed distinct subclusters within L. scutellare (3) and L. pallidum (2), indicating significant genetic diversity.
  • Substantial genetic distances were observed between and within these subclusters, highlighting cryptic diversity.

Conclusions:

  • DNA barcoding with the new primers provides precise and detailed classification of Leptotrombidium.
  • The study uncovered significant genetic diversity and potential subgenotypes in L. scutellare and L. pallidum.
  • This molecular approach surpasses traditional morphological identification for understanding Leptotrombidium diversity and their role in scrub typhus transmission.
Keywords:
DNA barcodingMitochondrial cytochrome c oxidase subunit I (COI)Morphological classificationSubgenotype

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