Evidence map›Paper›PMID 33441489›Full record

ReviewMicrobiology and molecular biology reviews : MMBR2021

Extracellular Metabolism Sets the Table for Microbial Cross-Feeding.

Ryan K Fritts, Alexandra L McCully, James B McKinlay

Open access · greenAbstract readReview
In one paragraph

Review in Microbiology and molecular biology reviews : MMBR, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 70 papers.

0numbers the graph read from it
0cells of the map it votes in
70citing papers in PubMed
15.1field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

70 citing papers in PubMed, 135 citations in OpenAlex.

  1. Review
  2. Review
  3. Establishment of anmSystems · 2026
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  10. Quantitative system drift.Proceedings of the National Academy of Sciences of the United States of America · 2026
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  12. Review
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  16. Review
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  19. Review
  20. Article

10 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 1 institution in 1 country.

Ryan K Fritts *Department of Biology, Indiana University, Bloomington, Indiana, USA.
Alexandra L McCully *Department of Biology, Indiana University, Bloomington, Indiana, USA.
James B McKinlay *Department of Biology, Indiana University, Bloomington, Indiana, USA jmckinla@indiana.edu.ORCID 0000-0003-2401-6229
Indiana University Bloomington · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The transfer of nutrients between cells, or cross-feeding, is a ubiquitous feature of microbial communities with emergent properties that influence our health and orchestrate global biogeochemical cycles. Cross-feeding inevitably involves the externalization of molecules. Some of these molecules directly serve as cross-fed nutrients, while others can facilitate cross-feeding. Altogether, externalized molecules that promote cross-feeding are diverse in structure, ranging from small molecules to macromolecules. The functions of these molecules are equally diverse, encompassing waste products, enzymes, toxins, signaling molecules, biofilm components, and nutrients of high value to most microbes, including the producer cell. As diverse as the externalized and transferred molecules are the cross-feeding relationships that can be derived from them. Many cross-feeding relationships can be summarized as cooperative but are also subject to exploitation. Even those relationships that appear to be cooperative exhibit some level of competition between partners. In this review, we summarize the major types of actively secreted, passively excreted, and directly transferred molecules that either form the basis of cross-feeding relationships or facilitate them. Drawing on examples from both natural and synthetic communities, we explore how the interplay between microbial physiology, environmental parameters, and the diverse functional attributes of extracellular molecules can influence cross-feeding dynamics. Though microbial cross-feeding interactions represent a burgeoning field of interest, we may have only begun to scratch the surface.

Indexed as

BacteriaBiofilmsBiological TransportExtracellular VesiclesMicrobiotaQuorum SensingSignal TransductionSymbiosisbiofilmcoculturecross-feedingexoenzymesmicrobial ecologymutualismnanowiresquorum sensingsiderophoressynthetic ecology

Identifiers

PMID33441489
PMCPMC7849352
OpenAlexW3118755710

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.