Evidence map›Paper›PMID 9495032›Full record

ArticleThe Journal of eukaryotic microbiology

The evolutionary history of the genus Acanthamoeba and the identification of eight new 18S rRNA gene sequence types.

D R Stothard, J M Schroeder-Diedrich, M H Awwad, R J Gast, D R Ledee, S Rodriguez-Zaragoza, C L Dean, P A Fuerst, T J Byers

Abstract readComparative Study
In one paragraph

Article in The Journal of eukaryotic microbiology. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 143 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
143citing 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

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

  1. Pooled it
  2. Article
  3. Article
  4. Molecular Typing ofMicroorganisms · 2025
    Article
  5. Review
  6. Article
  7. Article
  8. Article
  9. Article
  10. First Report ofPathogens (Basel, Switzerland) · 2024
    Article
  11. Article
  12. Review
  13. Microorganisms · 2024
    Article
  14. Article
  15. Acanthamoeba Keratitis in China: Genotypic and Clinical Correlations.Translational vision science & technology · 2024
    Article
  16. Proteases of Acanthamoeba.Parasitology research · 2023
    Review
  17. Article
  18. Review
  19. Article
  20. Article

83 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

9 authors.

D R StothardDepartment of Molecular Genetics, Ohio State University, Columbus 43210-1292, USA.
J M Schroeder-Diedrich
M H Awwad
R J Gast
D R Ledee
S Rodriguez-Zaragoza
C L Dean
P A Fuerst
T J Byers

Funding

DNA PROBES FOR ACANTHAMOEBA KERATITISR01EY009073 · NEI · OHIO STATE UNIVERSITY · PI FUERST, PAUL A · 1992 to 2007
$1.9M
NEI NIH HHS EY09073
6 · The paper itself

Abstract

The 18S rRNA gene (Rns) phylogeny of Acanthamoeba is being investigated as a basis for improvements in the nomenclature and taxonomy of the genus. We previously analyzed Rns sequences from 18 isolates from morphological groups 2 and 3 and found that they fell into four distinct evolutionary lineages we called sequence types T1-T4. Here, we analyzed sequences from 53 isolates representing 16 species and including 35 new strains. Eight additional lineages (sequence types T5-T12) were identified. Four of the 12 sequence types included strains from more than one nominal species. Thus, sequence types could be equated with species in some cases or with complexes of closely related species in others. The largest complex, sequence type T4, which contained six closely related nominal species, included 24 of 25 keratitis isolates. Rns sequence variation was insufficient for full phylogenetic resolution of branching orders within this complex, but the mixing of species observed at terminal nodes confirmed that traditional classification of isolates has been inconsistent. One solution to this problem would be to equate sequence types and single species. Alternatively, additional molecular information will be required to reliably differentiate species within the complexes. Three sequence types of morphological group 1 species represented the earliest divergence in the history of the genus and, based on their genetic distinctiveness, are candidates for reclassification as one or more novel genera.

Indexed as

Evolution, MolecularAcanthamoebaAllelesAnimalsBase SequenceGenes, ProtozoanGenetic HeterogeneityMolecular Sequence DataPhylogenyRNA, Ribosomal, 18SSequence AlignmentSequence Homology, Nucleic AcidRNA, Ribosomal, 18S

Identifiers

PMID9495032
PMCPMC7194170

What OpenQuestion holds

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Registered trials

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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.