Species and condition shape the mutational spectrum in experimentally evolved biofilms

Area of Science:

• Microbiology
• Evolutionary Biology
• Genomics

Background:

• Bacterial biofilms are crucial for survival and adaptation in various environments.
• Previous studies analyzed selected clones, but lacked a comprehensive view of evolutionary dynamics and inter-species comparisons.
• Understanding adaptive mechanisms in biofilms is key to controlling bacterial populations.

Purpose of the Study:

• To comprehensively map the mutational landscape of bacterial biofilms.
• To investigate the dynamic evolutionary trajectories of Bacillus thuringiensis and Bacillus subtilis during adaptation to abiotic and biotic surfaces.
• To identify similarities and differences in adaptive strategies between these two bacterial species.

Main Methods:

• Longitudinal whole-population genome sequencing was employed to achieve high-resolution genetic analysis.
• Experimental evolution was used to adapt Bacillus thuringiensis and Bacillus subtilis under specific biofilm conditions.
• Comparative genomics was utilized to analyze the mutational landscapes of evolved populations.

Main Results:

• The study provides the first comprehensive mutational landscape of biofilms for two bacterial species.
• Detailed genetic dynamics during adaptation to both abiotic and biotic surfaces were elucidated.
• High-resolution genomic data revealed novel insights into bacterial adaptation strategies within biofilms.

Conclusions:

• Longitudinal whole-population genome sequencing offers unprecedented resolution for studying bacterial evolution in biofilms.
• This research significantly advances our understanding of the genetic basis of biofilm adaptation in Bacillus species.
• The findings provide a foundation for future studies on biofilm development and control.