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Plasmids01:28

Plasmids

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Plasmids are extrachromosomal DNA molecules found in bacteria, archaea, and some eukaryotic microbes like yeast. These small, circular DNA structures typically contain fewer than 30 genes, although some may exist linearly. Plasmids vary in their number within a cell, known as copy number. Single-copy plasmids are present in one copy per cell and multi-copy plasmids are present in multiple copies, reaching over 100 copies per cell.Plasmids usually replicate independently of the chromosomal DNA...
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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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Universal rules govern plasmid copy number.

Paula Ramiro-Martínez1,2, Ignacio de Quinto1, Val F Lanza1,3

  • 1Microbiology Department, Hospital Universitario Ramón y Cajal-IRYCIS, Madrid, Spain.

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|July 2, 2025
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Summary
This summary is machine-generated.

This study reveals that bacterial plasmid copy number (PCN) is highly variable but robust, intrinsically linked to plasmid lifestyles. A universal scaling law connects PCN and plasmid size across species.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Plasmids, or autonomously replicating DNA molecules, possess diverse strategies for replication, mobility, and host interaction.
  • The factors determining plasmid copy number (PCN) in bacteria are not well understood.
  • Understanding PCN is crucial for various applications, including biotechnology and combating antibiotic resistance.

Purpose of the Study:

  • To comprehensively analyze the determinants of plasmid copy number (PCN) across a wide range of bacterial plasmids.
  • To investigate the relationship between PCN, plasmid lifestyle, and genomic context.
  • To identify universal principles governing the trade-off between plasmid size and copy number.

Main Methods:

  • Analysis of extensive DNA sequencing data from thousands of diverse bacterial plasmids.
  • Statistical analysis to correlate PCN with plasmid characteristics and lifestyle.
  • Development and application of a universal scaling law to model PCN-size relationships.

Main Results:

  • Plasmid copy number (PCN) exhibits high variability (three orders of magnitude) and is robust against genomic context changes.
  • PCN is strongly associated with distinct plasmid lifestyles.
  • A universal scaling law demonstrates a constrained trade-off between plasmid size and copy number across bacterial species.

Conclusions:

  • Plasmid copy number is influenced by lifestyle and subject to universal scaling laws.
  • The concept of 'replicon dominance' helps explain interactions in multi-replicon plasmids.
  • Pervasive biological constraints modulate the relationship between plasmid size and copy number in bacteria.