Unknown

Dataset Information

0

Flow-through stable isotope probing (Flow-SIP) minimizes cross-feeding in complex microbial communities.


ABSTRACT: Stable isotope probing (SIP) is a key tool for identifying the microorganisms catalyzing the turnover of specific substrates in the environment and to quantify their relative contributions to biogeochemical processes. However, SIP-based studies are subject to the uncertainties posed by cross-feeding, where microorganisms release isotopically labeled products, which are then used by other microorganisms, instead of incorporating the added tracer directly. Here, we introduce a SIP approach that has the potential to strongly reduce cross-feeding in complex microbial communities. In this approach, the microbial cells are exposed on a membrane filter to a continuous flow of medium containing isotopically labeled substrate. Thereby, metabolites and degradation products are constantly removed, preventing consumption of these secondary substrates. A nanoSIMS-based proof-of-concept experiment using nitrifiers in activated sludge and 13C-bicarbonate as an activity tracer showed that Flow-SIP significantly reduces cross-feeding and thus allows distinguishing primary consumers from other members of microbial food webs.

SUBMITTER: Mooshammer M 

PROVIDER: S-EPMC7852690 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

altmetric image

Publications

Flow-through stable isotope probing (Flow-SIP) minimizes cross-feeding in complex microbial communities.

Mooshammer Maria M   Kitzinger Katharina K   Schintlmeister Arno A   Ahmerkamp Soeren S   Nielsen Jeppe Lund JL   Nielsen Per Halkjær PH   Wagner Michael M  

The ISME journal 20200902 1


Stable isotope probing (SIP) is a key tool for identifying the microorganisms catalyzing the turnover of specific substrates in the environment and to quantify their relative contributions to biogeochemical processes. However, SIP-based studies are subject to the uncertainties posed by cross-feeding, where microorganisms release isotopically labeled products, which are then used by other microorganisms, instead of incorporating the added tracer directly. Here, we introduce a SIP approach that ha  ...[more]

Similar Datasets

| S-EPMC3273032 | biostudies-literature
| S-EPMC4592864 | biostudies-literature
| S-EPMC4850331 | biostudies-literature
| S-EPMC6908837 | biostudies-literature
| S-EPMC7082572 | biostudies-literature
| S-EPMC8453545 | biostudies-literature
| S-EPMC6613647 | biostudies-literature
| S-EPMC7717982 | biostudies-literature
| S-EPMC5133248 | biostudies-literature
| S-EPMC5881069 | biostudies-literature