Evidence map›Paper›PMID 28886021›Full record

ArticlePLoS neglected tropical diseases2017

Complete genome sequences of two strains of Treponema pallidum subsp. pertenue from Ghana, Africa: Identical genome sequences in samples isolated more than 7 years apart.

Michal Strouhal, Lenka Mikalová, Pavla Havlíčková, Paolo Tenti, Darina Čejková, Ivan Rychlík, Sylvia Bruisten, David Šmajs

Open access · goldAbstract read
In one paragraph

Article in PLoS neglected tropical diseases, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
3.1field-weighted citation impact, top 8% 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

21 citing papers in PubMed, 34 citations in OpenAlex.

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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

8 authors at 3 institutions in 2 countries.

Michal StrouhalDepartment of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic.
Lenka MikalováDepartment of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic.
Pavla HavlíčkováDepartment of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic.
Paolo TentiDepartment of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic.
Darina ČejkováDepartment of Immunology, Veterinary Research Institute, Hudcova 296/70, Brno, Czech Republic.
Ivan RychlíkDepartment of Immunology, Veterinary Research Institute, Hudcova 296/70, Brno, Czech Republic.
Sylvia BruistenRegional Laboratory for Public Health, Nieuwe Achtergracht 100, Amsterdam, The Netherlands.
David ŠmajsDepartment of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, Brno, Czech Republic.ORCID http://orcid.org/0000-0002-4176-3464
Masaryk University · CZVeterinary Research Institute · CZGGD Amsterdam · NL

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundTreponema pallidum subsp. pertenue (TPE) is the causative agent of yaws, a multi-stage disease, endemic in tropical regions of Africa, Asia, Oceania, and South America. To date, four TPE strains have been completely sequenced including three TPE strains of human origin (Samoa D, CDC-2, and Gauthier) and one TPE strain (Fribourg-Blanc) isolated from a baboon. All TPE strains are highly similar to T. pallidum subsp. pallidum (TPA) strains. The mutation rate in syphilis and related treponemes has not been experimentally determined yet. METHODOLOGY/PRINCIPAL

findingsComplete genomes of two TPE strains, CDC 2575 and Ghana-051, that infected patients in Ghana and were isolated in 1980 and 1988, respectively, were sequenced and analyzed. Both strains had identical consensus genome nucleotide sequences raising the question whether TPE CDC 2575 and Ghana-051 represent two different strains. Several lines of evidence support the fact that both strains represent independent samples including regions showing intrastrain heterogeneity (13 and 5 intrastrain heterogeneous sites in TPE Ghana-051 and TPE CDC 2575, respectively). Four of these heterogeneous sites were found in both genomes but the frequency of alternative alleles differed. The identical consensus genome sequences were used to estimate the upper limit of the yaws treponeme evolution rate, which was 4.1 x 10-10 nucleotide changes per site per generation. CONCLUSIONS/SIGNIFICANCE: The estimated upper limit for the mutation rate of TPE was slightly lower than the mutation rate of E. coli, which was determined during a long-term experiment. Given the known diversity between TPA and TPE genomes and the assumption that both TPA and TPE have a similar mutation rate, the most recent common ancestor of syphilis and yaws treponemes appears to be more than ten thousand years old and likely even older.

Indexed as

Genome, BacterialAnimalsAsiaChromosome MappingEscherichia coliGhanaHumansMutationPapioSequence Analysis, DNASouth AmericaTime FactorsTreponema pallidumYaws

Identifiers

PMID28886021
PMCPMC5607219
OpenAlexW2752728395

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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.