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Updated: Aug 29, 2025
14:06
Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
Published on: November 12, 2012
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A bacterial pan-genome makes gene essentiality strain-dependent and evolvable
Federico Rosconi1, Emily Rudmann1, Jien Li1
1Biology Department, Boston College, Chestnut Hill, MA, USA.
Nature Microbiology
|September 13, 2022
Summary
Bacterial pangenomes reveal how essential genes can become non-essential through evolution. This study identifies universal, core, and accessory essential genes in Streptococcus pneumoniae, offering new antimicrobial drug targets.
Area of Science:
- Microbiology
- Genomics
- Evolutionary Biology
Background:
- Bacterial pangenomes encompass a broader genetic repertoire than individual genomes.
- Understanding gene essentiality evolution within pangenomes is crucial for bacterial survival and drug development.
Purpose of the Study:
- To investigate the influence of bacterial pangenomes on gene essentiality.
- To determine if essential genes can evolve to become non-essential.
- To identify potential antimicrobial drug targets within the Streptococcus pneumoniae essentialome.
Main Methods:
- Transposon insertion sequencing (Tn-seq) to assess gene essentiality.
- Whole-genome sequencing and RNA-seq to analyze genetic and expression profiles.
- Forced-evolution experiments to study the bypass of essentiality.
Main Results:
- Identified a species-wide essentialome in Streptococcus pneumoniae, categorized into universal, core, strain-specific, and accessory essential genes.
- Demonstrated that bacteria can evolve to bypass essentiality through specific genetic changes.
- Uncovered mechanisms influencing gene essentiality, including accessory genome composition, toxic intermediate accumulation, functional redundancy, metabolite recycling, and pathway rewiring.
Conclusions:
- Gene essentiality is dynamic and influenced by pangenome composition and evolutionary mechanisms.
- Genes with differential essentiality represent promising candidates for antimicrobial drug targets due to significant fitness costs upon inactivation.
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