Evidence map›Paper›PMID 25911659›Full record

ArticleGenetics2015

Adaptation, Clonal Interference, and Frequency-Dependent Interactions in a Long-Term Evolution Experiment with Escherichia coli.

Rohan Maddamsetti, Richard E Lenski, Jeffrey E Barrick

Abstract read
In one paragraph

Article in Genetics, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 94 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
94citing papers in PubMed, 1 pooled it
–field-weighted citation impact
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

94 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  11. The evolution of thermal performance curves in response to rising temperatures across the model genus yeast.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  12. Detecting (the Absence of) Species Interactions in Microbial Ecological Systems.Studies in applied mathematics (Cambridge, Mass.) · 2025
    Article
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34 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.

Rohan MaddamsettiProgram in Ecology, Evolutionary Biology and Behavior, Michigan State University, East Lansing, Michigan 48824 BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, Michigan 48824.ORCID http://orcid.org/0000-0003-3370-092X
Richard E LenskiProgram in Ecology, Evolutionary Biology and Behavior, Michigan State University, East Lansing, Michigan 48824 BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, Michigan 48824.
Jeffrey E BarrickBEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, Michigan 48824 Department of Molecular Biosciences, Institute for Cellular and Molecular Biology, Center for Systems and Synthetic Biology, University of Texas at Austin, Austin, Texas 78712 jbarrick@cm.utexas.edu.

Funding

Identifying Mutations that Promote Microbial EvolvabilityR00GM087550 · NIGMS · UNIVERSITY OF TEXAS AT AUSTIN · PI BARRICK, JEFFREY EVAN · 2011 to 2013
$724k
NIGMS NIH HHS R00 GM087550NIGMS NIH HHS R00-GM087550
6 · The paper itself

Abstract

Twelve replicate populations of Escherichia coli have been evolving in the laboratory for >25 years and 60,000 generations. We analyzed bacteria from whole-population samples frozen every 500 generations through 20,000 generations for one well-studied population, called Ara-1. By tracking 42 known mutations in these samples, we reconstructed the history of this population's genotypic evolution over this period. The evolutionary dynamics of Ara-1 show strong evidence of selective sweeps as well as clonal interference between competing lineages bearing different beneficial mutations. In some cases, sets of several mutations approached fixation simultaneously, often conveying no information about their order of origination; we present several possible explanations for the existence of these mutational cohorts. Against a backdrop of rapid selective sweeps both earlier and later, two genetically diverged clades coexisted for >6000 generations before one went extinct. In that time, many additional mutations arose in the clade that eventually prevailed. We show that the clades evolved a frequency-dependent interaction, which prevented the immediate competitive exclusion of either clade, but which collapsed as beneficial mutations accumulated in the clade that prevailed. Clonal interference and frequency dependence can occur even in the simplest microbial populations. Furthermore, frequency dependence may generate dynamics that extend the period of coexistence that would otherwise be sustained by clonal interference alone.

Indexed as

Adaptation, BiologicalBiological EvolutionMicrobial InteractionsAllelesEscherichia coliGene FrequencyGenetic DriftGenotypeModels, GeneticMutationasexual populationsbeneficial mutationsclonal interferenceexperimental evolutionfrequency-dependent selectionmutational cohorts

Identifiers

PMID25911659
PMCPMC4492384

What OpenQuestion holds

Textmetadata
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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.