Related Experiment Video
Updated: Jul 10, 2026
08:29
Using Coculture to Detect Chemically Mediated Interspecies Interactions
Published on: October 31, 2013
Did bacterial sensing of host environments evolve from sensing within microbial communities?
Samuel I Miller1, Lucas R Hoffman, Sarah Sanowar
1Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA. millersi@u.washington.edu
Cell Host & Microbe
|November 17, 2007
Summary
Staphylococcus aureus senses heme, a marker of the mammalian host, to adapt to new environments. This sensing mechanism likely evolved from microbial community interactions predating eukaryotes.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Host-Microbe Interactions
Background:
- Bacteria exhibit environmental sensing for niche adaptation, including within multicellular eukaryotes.
- Staphylococcus aureus is a significant human pathogen requiring adaptation to host environments.
Discussion:
- Torres et al. investigate Staphylococcus aureus's response to heme, a key indicator of the mammalian host.
- Heme sensing allows bacteria to recognize and adapt to the host environment.
Key Insights:
- Staphylococcus aureus utilizes heme as a molecular signal to identify the mammalian host.
- This bacterial adaptation mechanism highlights the intricate relationship between microbes and their hosts.
Outlook:
- The study suggests that heme-sensing mechanisms in bacteria may have ancient origins, evolving from microbial community signaling.
- Understanding these evolved sensing pathways can inform strategies against bacterial infections.
More Related Videos
Related Concept Videos
01:17Microbial Biosensors
Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
01:30Bacterial Signaling
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
01:24Evolution of New Traits in Microbes
Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
01:29Modern Molecular Taxonomy
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
01:19Methods to Assess Microbial Communities
Microbial communities, comprising bacteria, archaea, and eukaryotic microorganisms, inhabit diverse ecosystems and play crucial roles in environmental and biological processes. Their diversity is defined by three main parameters: species richness (the number of distinct species), species abundance (the relative quantity of each species), and species evenness (how uniformly individual species are distributed in various locations). These factors together shape the structure and ecological balance...
01:28Gene Regulation in Microbial Communities: Quorum Sensing
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...