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This study significantly expands the Wolbachia genome database, revealing widespread horizontal gene transfer and diverse gene evolution. Findings challenge synchronous divergence with host mitochondria, offering new insights into bacterial evolution.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Wolbachia are crucial intracellular bacteria influencing invertebrate biology.
  • Their evolutionary dynamics remain understudied from a genomic perspective.

Purpose of the Study:

  • To significantly increase the number of available Wolbachia genomes.
  • To provide a robust genomic reference for future evolutionary studies.
  • To investigate Wolbachia evolutionary dynamics, including gene gain/loss and horizontal transfer.

Main Methods:

  • Screening over 30,000 public shotgun DNA sequencing samples.
  • Assembling over 1000 Wolbachia genomes.
  • Phylogenetic analyses using core-genome and gene content.

Main Results:

  • Assembly of over 1000 Wolbachia genomes, greatly enhancing host representation.
  • Phylogenies support new strains and reveal recent horizontal transfers between hosts.
  • Identification of gene function gains and losses in various Wolbachia super-groups and strains.
  • Wolbachia-host co-phylogenies indicate widespread intraspecific horizontal transmission.

Conclusions:

  • Horizontal transmission is common at the host intraspecific level.
  • No evidence supports synchronous divergence between Wolbachia and host mitochondria.
  • The expanded genomic data provides a foundation for future Wolbachia evolutionary research.