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Omics-based comparative analysis of putative mobile genetic elements in Lactococcus lactis.

Joakim Mark Andersen1, Christine Møller Pedersen1, Claus Heiner Bang-Berthelsen1

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This study explored mobile genetic elements in Lactococcus lactis, a key food fermentation bacterium. Researchers found these elements significantly vary between strains, impacting bacterial function and offering potential for food and biotech applications.

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Area of Science:

  • Microbiology
  • Genomics
  • Food Science

Background:

  • Lactococcus lactis is crucial for global food fermentation.
  • Genomics aids in understanding bacterial speciation and gene functions, particularly those linked to mobile DNA.
  • Mobile genetic elements are significant drivers of genomic variation in bacteria.

Purpose of the Study:

  • To identify putative chromosomal mobile genetic elements in Lactococcus lactis using comparative genomics.
  • To analyze the contribution of these elements to chromosomal variation at the strain level.
  • To investigate the impact of mobile genetic elements on host physiology through transcriptomics.

Main Methods:

  • Comparative genomics to identify mobile genetic elements.
  • Analysis of differential occurrence of these elements across L. lactis strains.
  • Differential transcriptomics to assess gene expression changes.

Main Results:

  • Identified 95 loci of potential mobile genetic elements, including prophages, which can constitute over 10% of the chromosome.
  • Observed significant differential occurrence of these loci among analyzed L. lactis strains.
  • Demonstrated that mobile genetic elements influence host physiology in response to environmental conditions.

Conclusions:

  • Mobile genetic elements contribute substantially to chromosomal variation in Lactococcus lactis.
  • Understanding this variation provides insights into bacterial adaptation and function.
  • This knowledge can be leveraged to identify novel traits for food and biotechnology applications.