Metabolic adaptations underlying genome flexibility in prokaryotes

Area of Science:

• Microbiology
• Genomics
• Evolutionary Biology

Background:

• Prokaryotic genomes display significant gene content variability within species.
• The adaptive significance of this flexible or accessory genome content remains largely unexplored due to limited functional analyses.

Purpose of the Study:

• To investigate the functional roles of accessory genomes in prokaryotes.
• To determine if accessory genes confer adaptive advantages through metabolic functions.

Main Methods:

• Analysis of accessory genome content across 96 diverse prokaryotic species.
• Identification and functional characterization of metabolic genes within accessory genomes.

Main Results:

• Approximately 40% of accessory genomes harbor beneficial metabolic functions.
• These functions enhance individual strain biosynthetic potential.
• Accessory genes mitigate strain-specific metabolic auxotrophies through inter-strain metabolic exchanges.
• The prevalence of these beneficial functions correlates positively with genome flexibility.

Conclusions:

• A substantial portion of prokaryotic accessory genomes provides adaptive metabolic advantages.
• These findings support a significant adaptive role for prokaryotic pangenomes and genome flexibility.