Tracking microbial interactions with NanoSIMS

Area of Science:

• Microbiology
• Biogeochemistry
• Microbial Ecology

Background:

• Linking microbial identity to function is crucial for understanding complex ecosystems.
• Stable isotope probing (SIP) coupled with NanoSIMS imaging and fluorescence in situ hybridization (FISH) is a powerful tool for cellular-level analysis.
• Challenges remain in resolving rapid nutrient exchanges in syntrophic and symbiotic microbial communities.

Purpose of the Study:

• To review recent applications of nanoSIP in microbial ecology.
• To highlight the tracking of isotopically labeled molecules between organisms.
• To elucidate metabolic interactions and nutrient fluxes in microbial associations.

Main Methods:

• NanoSIMS imaging combined with stable isotope probing (nanoSIP).
• Fluorescence in situ hybridization (FISH) for microbe identification.
• Analysis of isotopically labeled molecules to track nutrient exchange.

Main Results:

• nanoSIP successfully tracks carbon and nitrogen fluxes between phototrophs and heterotrophs.
• Metabolic interactions within syntrophic consortia are elucidated.
• Nutrient sharing between symbionts and hosts is detailed.

Conclusions:

• nanoSIP is effective for deciphering rapid nutrient exchanges in microbial symbioses.
• Integrating nanoSIP with genomic and transcriptomic data enhances mechanistic understanding.
• Careful consideration of sample preparation is vital for accurate nanoSIP interpretation.