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Linear Plasmids in Micrococcus: Insights Into a Common Ancestor and Transfer by Conjugation.

María Florencia Perez1, Angel Angelov2,3, Maria Übelacker2

  • 1Planta Piloto de Procesos Industriales Microbiológicos, Consejo Nacional de Investigaciones Científicas y Técnicas, San Miguel de Tucumán, Tucumán, Argentina.

Environmental Microbiology
|January 8, 2025
PubMed
Summary

Micrococcus bacteria from the Andean Puna possess large linear plasmids conferring resistance to extreme conditions. These plasmids show evolutionary links and facilitate gene transfer, aiding microbial adaptation in harsh environments.

Keywords:
MicrococcusAndean Punaextreme conditionshorizontal transferlinear plasmidresistance

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Area of Science:

  • Microbiology
  • Genetics
  • Environmental Science

Background:

  • Actinobacteria, including Micrococcus, are found in the Andean Puna.
  • These microbes exhibit resistance to UV radiation, arsenic, and antibiotics.
  • They possess large linear plasmids, which are key to their survival.

Purpose of the Study:

  • To conduct a comparative analysis of the sequences and functions of Micrococcus megaplasmids.
  • To investigate the evolutionary relationships and genetic plasticity of these plasmids.
  • To explore the potential of these plasmids as genetic vectors.

Main Methods:

  • Comparative sequence analysis of three Micrococcus megaplasmids.
  • Identification and functional annotation of genes within conserved and accessory regions.
  • Investigation of plasmid transfer mechanisms.

Main Results:

  • A significant evolutionary link was found among the plasmids, with conserved regions containing essential genes.
  • Accessory regions harbor genes for metal and antibiotic resistance.
  • Evidence suggests a mosaic structure, high genetic plasticity, and frequent horizontal gene transfer.

Conclusions:

  • The study provides evidence for a common ancestor of linear plasmids in Micrococcus.
  • Horizontal gene transfer in Andean lakes likely enhances microbial adaptation to extreme conditions.
  • The linear plasmid pLMA1 can be transferred via a conjugation-type mechanism and has potential as a genetic vector.