NanoSIP: NanoSIMS Applications for Microbial Biology

Area of Science:

• Systems biology
• Environmental biogeochemistry
• Microbial ecology

Background:

• Secondary Ion Mass Spectrometry (nanoSIMS) is a key tool for analyzing microbial traits, metabolic processes, and symbioses.
• nanoSIMS combined with stable isotope probing (nanoSIP) quantifies assimilation rates and stoichiometry in diverse environments.
• Previous nanoSIP studies primarily focused on carbon and nitrogen metabolism.

Purpose of the Study:

• To provide an updated description of nanoSIP-nanoSIMS methods.
• To highlight recent advancements and applications of nanoSIMS in microbial and environmental studies.
• To discuss key methodological steps, potential pitfalls, and future directions.

Main Methods:

• High-resolution nanoSIMS imaging combined with stable isotope labeling (¹⁵N, ¹³C).
• Advancements include high-brightness oxygen ion source for metal analysis.
• New preparation methods, automated data extraction, and enhanced sensitivity/resolution analytical approaches.

Main Results:

• nanoSIP-nanoSIMS enables quantification of net assimilation and stoichiometry at the single-cell level.
• High-resolution metal analysis is now more accessible.
• Characterization of diverse populations from marine archaea to viruses is improved.
• Integration with orthogonal imaging and 'omics approaches links function to identity and gene expression.

Conclusions:

• nanoSIP-nanoSIMS is a powerful, evolving technique for microbial and environmental research.
• Recent advances expand its scope to metal analysis and complex biological systems.
• Correlative approaches significantly enhance the depth of biological insights.