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Prophage-Driven Genomic Structural Changes Promote Bartonella Vertical Evolution.

Ricardo Gutiérrez1, Barak Markus2, Keyla Carstens Marques de Sousa1

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Summary
This summary is machine-generated.

Genomic alterations in Bartonella bacteria reveal that large structural changes, not point mutations, drive diversity. Prophages play a key role in generating this genetic variation in nature.

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Area of Science:

  • Microbiology
  • Genomics
  • Evolutionary Biology

Background:

  • Bartonella bacteria exhibit significant genetic diversity, primarily from mammalian reservoirs and arthropod vectors.
  • Rodent reservoirs host a large diversity of Bartonella, with continuous identification of novel species and variants.
  • The origins of Bartonella genetic diversity, whether from niche adaptation or high mutation rates, remain unclear.

Purpose of the Study:

  • To investigate spontaneous genomic alterations in Bartonella elizabethae-like strains.
  • To understand the role of temperature and transmission cycles in bacterial genome evolution.
  • To determine the contribution of structural variations and prophages to Bartonella diversity.

Main Methods:

  • Mutation accumulation experiments were conducted on 18 Bartonella elizabethae-like strain lines.
  • Strains were evolved for ~1,000 generations under conditions mimicking vector (26°C) and mammalian (37°C) temperatures.
  • Genomic analysis focused on identifying point mutations and large structural genomic changes, complemented by analyses of wild strains.

Main Results:

  • Conserved single-nucleotide mutation rates were observed, with an average of one point mutation per line.
  • Three large structural genomic changes (deletions and an inversion) were identified, linked to prophages and surface adhesin genes.
  • A prophage deleted at 37°C showed increased replication at 26°C, and similar variations were found in wild strains.

Conclusions:

  • Structural genomic changes, rather than point mutations, are an effective intrinsic mechanism for diversity generation in slow-growing bacteria like Bartonella.
  • Prophages significantly contribute to promoting genetic diversity in Bartonella populations within natural environments.
  • Findings highlight the importance of investigating structural variations for understanding bacterial evolution and adaptation.