Evidence map›Paper›PMID 20852019›Full record

ArticleThe Plant cell2010

The Chlorella variabilis NC64A genome reveals adaptation to photosymbiosis, coevolution with viruses, and cryptic sex.

Guillaume Blanc, Garry Duncan, Irina Agarkova, Mark Borodovsky, James Gurnon, Alan Kuo, Erika Lindquist, Susan Lucas, Jasmyn Pangilinan, Juergen Polle and 7 more

Open access · bronzeAbstract read
In one paragraph

Article in The Plant cell, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 206 papers.

0numbers the graph read from it
0cells of the map it votes in
206citing papers in PubMed
33.2field-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

206 citing papers in PubMed, 498 citations in OpenAlex.

  1. Genome analysis of the glycosphingolipid-producing green alga tetraselmis sp. NKG400013.DNA research : an international journal for rapid publication of reports on genes and genomes · 2026
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  10. Knock Down ofPlants (Basel, Switzerland) · 2025
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  13. The cell biology and genome ofMolecular biology of the cell · 2025
    Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Review
  19. Effects of the SymbioticMicroorganisms · 2024
    Review
  20. Conserved carotenoid pigmentation in reproductive organs of Charophyceae.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2024
    Article

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

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

17 authors at 7 institutions in 3 countries.

Guillaume BlancCentre National de la Recherche Scientifique, Laboratoire Information Génomique et Structurale UPR2589, Aix-Marseille Université, Institut de Microbiologie de la Méditerranée, 13009 Marseille, France. guillaume.blanc@igs.cnrs-mrs.fr
Garry Duncan
Irina Agarkova
Mark Borodovsky
James Gurnon
Alan Kuo
Erika Lindquist
Susan Lucas
Jasmyn Pangilinan
Juergen Polle
Asaf Salamov
Astrid Terry
Takashi Yamada
David D Dunigan
Igor V Grigoriev
Jean-Michel Claverie
James L Van Etten
Joint Genome Institute · USUniversity of Nebraska–Lincoln · USAix-Marseille Université · FRCity University of New York · USGeorgia Institute of Technology · USHiroshima University · JPNebraska Wesleyan University · US

Funding

ZINC FINGER-INSPIRED FLUORESCENT CHEMOSENSORSP20RR016469 · NCRR · UNIVERSITY OF NEBRASKA MEDICAL CENTER · PI TURPEN, JAMES B · 2001 to 2011
$36.2M
GENOME AND GENETICS OF A EUKARYOTIC ALGAL VIRUSR01GM032441 · NIGMS · UNIVERSITY OF NEBRASKA LINCOLN · PI VAN ETTEN, JAMES L · 1985 to 2009
$2.8M
NCRR NIH HHS P20 RR016469NIGMS NIH HHS GM32441NIGMS NIH HHS R01 GM032441
6 · The paper itself

Abstract

Chlorella variabilis NC64A, a unicellular photosynthetic green alga (Trebouxiophyceae), is an intracellular photobiont of Paramecium bursaria and a model system for studying virus/algal interactions. We sequenced its 46-Mb nuclear genome, revealing an expansion of protein families that could have participated in adaptation to symbiosis. NC64A exhibits variations in GC content across its genome that correlate with global expression level, average intron size, and codon usage bias. Although Chlorella species have been assumed to be asexual and nonmotile, the NC64A genome encodes all the known meiosis-specific proteins and a subset of proteins found in flagella. We hypothesize that Chlorella might have retained a flagella-derived structure that could be involved in sexual reproduction. Furthermore, a survey of phytohormone pathways in chlorophyte algae identified algal orthologs of Arabidopsis thaliana genes involved in hormone biosynthesis and signaling, suggesting that these functions were established prior to the evolution of land plants. We show that the ability of Chlorella to produce chitinous cell walls likely resulted from the capture of metabolic genes by horizontal gene transfer from algal viruses, prokaryotes, or fungi. Analysis of the NC64A genome substantially advances our understanding of the green lineage evolution, including the genomic interplay with viruses and symbiosis between eukaryotes.

Indexed as

Evolution, MolecularGenome, PlantSymbiosisBase CompositionCell WallChlorellaDNA, PlantExpressed Sequence TagsFlagellaMolecular Sequence DataMultigene FamilyPlant Growth RegulatorsRepetitive Sequences, Nucleic AcidReproductionSequence Analysis, DNADNA, PlantPlant Growth Regulators

Identifiers

PMID20852019
PMCPMC2965543
OpenAlexW2155360453

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.