Tenebrio molitor as a model system to study Staphylococcus spp virulence and horizontal gene transfer

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Updated: Jul 19, 2025

Methodology for the Study of Horizontal Gene Transfer in Staphylococcus aureus
10:39

Methodology for the Study of Horizontal Gene Transfer in Staphylococcus aureus

Published on: March 10, 2017

16.7K

Ana Luisa Andrade-Oliveira1, Geovana Lacerda-Rodrigues1, Monalessa Fábia Pereira2

  • 1Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.

Microbial Pathogenesis
|August 11, 2023
PubMed

Insights

Mealworm larvae offer a cost-effective invertebrate model for studying Staphylococcus virulence and antimicrobial resistance gene transfer. This research establishes Tenebrio molitor as a reliable tool for infection and plasmid transfer studies.

Area of Science:

  • Microbiology
  • Invertebrate Pathology
  • Antimicrobial Resistance

Background:

  • Vertebrate models are traditional for infection studies.
  • Invertebrates offer a viable alternative for studying bacterial and fungal pathogenesis.
  • Tenebrio molitor (mealworm) larvae present a potential model system.

Purpose of the Study:

  • To establish Tenebrio molitor larvae as an in vivo model for evaluating Staphylococcus virulence.
  • To assess the suitability of mealworm larvae for studying horizontal gene transfer, specifically plasmid transfer, in Staphylococcus.
  • To determine the optimal conditions for rearing T. molitor for experimental use.

Main Methods:

  • Rearing conditions for T. molitor were optimized.
  • Larvae were infected with various Staphylococcus species to determine dose-dependent killing curves.
  • Hemocyte concentration in hemolymph was measured post-infection.
  • Plasmid transfer (conjugation) between Staphylococcus aureus strains was studied in larvae using a gentamicin resistance gene.

Main Results:

  • Staphylococcus species exhibited dose-dependent killing of T. molitor larvae.
  • Staphylococcus nepalensis was the most virulent, while Staphylococcus aureus was the least virulent.
  • Hemocyte concentration increased proportionally to infection virulence.
  • Plasmid transfer from donor to recipient Staphylococcus aureus strains was successfully observed in larvae with a frequency of 1.6 × 10^-5 per donor cell.

Conclusions:

  • Tenebrio molitor larvae serve as a reliable and cost-effective in vivo model for assessing Staphylococcus virulence.
  • Mealworm larvae provide an effective environment for studying plasmid transfer between Staphylococcus aureus strains, including those carrying antimicrobial resistance genes.
  • This study validates the use of mealworms for investigating bacterial pathogenesis and the spread of antibiotic resistance.
Keywords:
Antimicrobial resistanceHorizontal gene transferInfection modelStaphylococciTenebrio molitorVirulence

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