Within-host bacterial evolution and the emergence of pathogenicity

Area of Science:

• Microbiology
• Genomics
• Evolutionary Biology

Background:

• Whole-genome sequencing (WGS) provides critical insights into bacterial pathogen evolution within hosts.
• Understanding within-host evolution is key to addressing antibiotic resistance and immune evasion.
• Genomic and metagenomic sequencing aids in tracking bacterial transmission for infection control.

Purpose of the Study:

• To review the major processes driving bacterial evolution within human hosts.
• To examine the role of mutational processes and selective pressures.
• To highlight the importance of within-host genetic diversity in tracking transmission and public health.

Main Methods:

• Review of current literature on bacterial evolution and genomics.
• Analysis of studies utilizing whole-genome and metagenomic sequencing.
• Discussion of evolutionary dynamics including mutation, selection, and horizontal gene transfer.

Main Results:

• Mutational signatures offer insights into pathogen biology and evolution.
• Selective pressures drive the emergence of resistance and immune evasion.
• Horizontal gene transfer and intra-host competition shape pathogen populations.
• Within-host genetic diversity is vital for tracking transmission.

Conclusions:

• Genomic approaches are essential for understanding bacterial pathogenesis and evolution.
• Tracking within-host diversity improves infectious disease control and public health strategies.
• Continued application of sequencing technologies will advance our ability to combat bacterial threats.