Evidence map›Paper›PMID 26436423›Full record

ArticlePLoS neglected tropical diseases2015

A Retrospective Study on Genetic Heterogeneity within Treponema Strains: Subpopulations Are Genetically Distinct in a Limited Number of Positions.

Darina Čejková, Michal Strouhal, Steven J Norris, George M Weinstock, David Šmajs

Open access · goldAbstract read
In one paragraph

Article in PLoS neglected tropical diseases, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
1.9field-weighted citation impact, top 14% 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

16 citing papers in PubMed, 24 citations in OpenAlex.

  1. Formal description ofInternational journal of systematic and evolutionary microbiology · 2026
    Article
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  3. Establishment of the Nichols strain as the type strain ofInternational journal of systematic and evolutionary microbiology · 2025
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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

5 authors at 4 institutions in 2 countries.

Darina ČejkováDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic; Department of Immunology, Veterinary Research Institute, Brno, Czech Republic.
Michal StrouhalDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.
Steven J NorrisPathology & Laboratory Medicine, The University of Texas Health Science Center at Houston, Houston, Texas, United States of America.
George M WeinstockThe Genome Institute, Washington University in St. Louis, St. Louis, Missouri, United States of America.
David ŠmajsDepartment of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.
Masaryk University · CZThe University of Texas Health Science Center at Houston · USVeterinary Research Institute · CZWashington University in St. Louis · US

Funding

Physiologic Characteristics of Treponema PallidumR01AI049252 · NIAID · UNIVERSITY OF TEXAS HLTH SCI CTR HOUSTON · PI NORRIS, STEVEN J · 2001 to 2004
$1.3M
NIAID NIH HHS R01 AI049252
6 · The paper itself

Abstract

backgroundPathogenic uncultivable treponemes comprise human and animal pathogens including agents of syphilis, yaws, bejel, pinta, and venereal spirochetosis in rabbits and hares. A set of 10 treponemal genome sequences including those of 4 Treponema pallidum ssp. pallidum (TPA) strains (Nichols, DAL-1, Mexico A, SS14), 4 T. p. ssp. pertenue (TPE) strains (CDC-2, Gauthier, Samoa D, Fribourg-Blanc), 1 T. p. ssp. endemicum (TEN) strain (Bosnia A) and one strain (Cuniculi A) of Treponema paraluisleporidarum ecovar Cuniculus (TPLC) were examined with respect to the presence of nucleotide intrastrain heterogeneous sites. METHODOLOGY/PRINCIPAL

findingsThe number of identified intrastrain heterogeneous sites in individual genomes ranged between 0 and 7. Altogether, 23 intrastrain heterogeneous sites (in 17 genes) were found in 5 out of 10 investigated treponemal genomes including TPA strains Nichols (n = 5), DAL-1 (n = 4), and SS14 (n = 7), TPE strain Samoa D (n = 1), and TEN strain Bosnia A (n = 5). Although only one heterogeneous site was identified among 4 tested TPE strains, 16 such sites were identified among 4 TPA strains. Heterogeneous sites were mostly strain-specific and were identified in four tpr genes (tprC, GI, I, K), in genes involved in bacterial motility and chemotaxis (fliI, cheC-fliY), in genes involved in cell structure (murC), translation (prfA), general and DNA metabolism (putative SAM dependent methyltransferase, topA), and in seven hypothetical genes. CONCLUSIONS/SIGNIFICANCE: Heterogeneous sites likely represent both the selection of adaptive changes during infection of the host as well as an ongoing diversifying evolutionary process.

Indexed as

Bacterial Outer Membrane ProteinsGenome, BacterialHumansRetrospective StudiesTreponemaBacterial Outer Membrane ProteinsTpr protein, Treponema

Identifiers

PMID26436423
PMCPMC4593590
OpenAlexW2269638039

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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.