# mSphere of Influence: Rethinking microbial identity through variability

## TL;DR

This paper explores how microbial identity is defined by variability, not static traits, using insights from bacterial evolution studies.

## Contribution

The paper reframes microbial identity through the lens of evolutionary variability, integrating concepts from population genomics and pangenomics.

## Key findings

- Microbial identity is better understood through evolutionary processes rather than static reference genomes.
- Variability is a core biological feature of microbes, not an exception.
- Population genomics and regulatory heterogeneity provide new frameworks for studying bacterial adaptation.

## Abstract

Laura Veschetti works in the field of microbial genomics and adaptation. In this mSphere of Influence article, she reflects on how the work of Marvig et al. on within-host evolution of Pseudomonas aeruginosa, together with long-term evolution experiments by Lenski and colleagues, reshaped her understanding of microbial identity by framing variability as a defining biological feature rather than an exception. Drawing on concepts from population genomics, pangenomics, and regulatory heterogeneity, she discusses how focusing on evolutionary processes rather than static reference genomes has influenced her approach to studying bacterial adaptation.