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DNA Stable-Isotope Probing (DNA-SIP)

DNA Stable-Isotope Probing (DNA-SIP)

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Stable isotope probing: technical considerations when resolving (15)N-labeled RNA in gradients.

S L Addison¹, I R McDonald, G Lloyd-Jones

¹Scion, Private Bag 3020, Rotorua 3010, New Zealand. sarah.addison@scionresearch.com

Journal of Microbiological Methods

|November 12, 2009

Summary

New (15)N-RNA-SIP methods help identify microbes using nitrogen. While isotopic labeling aids separation, definitive resolution of labeled from unlabeled RNA remains challenging, requiring further development for environmental applications.

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Area of Science:

Microbiology
Molecular Biology
Environmental Science

Background:

Stable isotope probing (SIP) identifies active microbial populations assimilating labeled compounds.
(15)N-RNA-SIP is a novel method with potential but untested applications.
Understanding nitrogen cycling microbes is crucial for environmental processes.

Purpose of the Study:

To evaluate the efficacy and limitations of (15)N-RNA-SIP for analyzing microbial communities.
To define challenges associated with using (15)N-labeled substrates in SIP.
To propose modifications for improving (15)N-RNA-SIP.

Main Methods:

Incubation of mixed microbial communities with (15)N-ammonium chloride or (15)N(2).
Isopycnic centrifugation of RNA in caesium trifluoroacetate (CsTFA) gradients.
Analysis using terminal-restriction fragment length polymorphism (T-RFLP) and fluorescent in situ hybridisation (FISH).

Main Results:

Increased isotopic labeling enhanced buoyant density (BD) separation between (15)N- and (14)N-RNA.
Definitive resolution of labeled from unlabeled RNA was not achieved through gradient fractionation.
T-RFLP and FISH provided insights into nitrogen-fixing organisms.

Conclusions:

While (15)N-RNA-SIP shows promise for studying nitrogen assimilation, limitations in RNA resolution persist.
Further methodological development is needed to optimize its application in diverse nitrogen-fixing environments.
The study highlights the need for robust techniques to track microbial activity in situ.