Evidence map›Paper›PMID 22087342›Full record

ArticlePLoS neglected tropical diseases2011

Comparison of two multilocus sequence based genotyping schemes for Leptospira species.

Ahmed Ahmed, Janjira Thaipadungpanit, Siriphan Boonsilp, Vanaporn Wuthiekanun, Kishore Nalam, Brian G Spratt, David M Aanensen, Lee D Smythe, Niyaz Ahmed, Edward J Feil and 2 more

Abstract readComparative StudyEvaluation Study
In one paragraph

Article in PLoS neglected tropical diseases, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
25citing 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

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

  1. Pooled it
  2. Article
  3. Article
  4. Article
  5. Host-Driven Genetic Diversity ofTransboundary and emerging diseases · 2026
    Article
  6. Shaping the future ofJournal of medical microbiology · 2025
    Review
  7. Detection and Identification of PathogenicTransboundary and emerging diseases · 2024
    Article
  8. Article
  9. Application of Multilocus Sequence Typing for the Characterization ofTropical medicine and infectious disease · 2023
    Article
  10. Occurrence of Bacterial and Protozoan Pathogens in Red Foxes (Animals : an open access journal from MDPI · 2022
    Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Culture Strategies for Isolation of FastidiousFrontiers in microbiology · 2017
    Article
  17. Article
  18. Article
  19. Article
  20. Identification of Leptospira serovars by RFLP of the RNA polymerase beta subunit gene (rpoB).Brazilian journal of microbiology : [publication of the Brazilian Society for Microbiology] · 2015
    Article
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

12 authors.

Ahmed AhmedWHO/FAO/OIE and National Collaborating Centre for Reference and Research on Leptospirosis, Department of Biomedical Research, Royal Tropical Institute (KIT), Amsterdam, The Netherlands. a.ahmed@kit.nl
Janjira Thaipadungpanit
Siriphan Boonsilp
Vanaporn Wuthiekanun
Kishore Nalam
Brian G Spratt
David M Aanensen
Lee D Smythe
Niyaz Ahmed
Edward J Feil
Rudy A Hartskeerl
Sharon J Peacock

Funding

Wellcome Trust 089472
6 · The paper itself

Abstract

backgroundSeveral sequence based genotyping schemes have been developed for Leptospira spp. The objective of this study was to genotype a collection of clinical and reference isolates using the two most commonly used schemes and compare and contrast the results. METHODS AND

findingsA total of 48 isolates consisting of L. interrogans (n = 40) and L. kirschneri (n = 8) were typed by the 7 locus MLST scheme described by Thaipadungpanit et al., and the 6 locus genotyping scheme described by Ahmed et al., (termed 7L and 6L, respectively). Two L. interrogans isolates were not typed using 6L because of a deletion of three nucleotides in lipL32. The remaining 46 isolates were resolved into 21 sequence types (STs) by 7L, and 30 genotypes by 6L. Overall nucleotide diversity (based on concatenated sequence) was 3.6% and 2.3% for 7L and 6L, respectively. The D value (discriminatory ability) of 7L and 6L were comparable, i.e. 92.0 (95% CI 87.5-96.5) vs. 93.5 (95% CI 88.6-98.4). The dN/dS ratios calculated for each locus indicated that none were under positive selection. Neighbor joining trees were reconstructed based on the concatenated sequences for each scheme. Both trees showed two distinct groups corresponding to L. interrogans and L. kirschneri, and both identified two clones containing 10 and 7 clinical isolates, respectively. There were six instances in which 6L split single STs as defined by 7L into closely related clusters. We noted two discrepancies between the trees in which the genetic relatedness between two pairs of strains were more closely related by 7L than by 6L.

conclusionsThis genetic analysis indicates that the two schemes are comparable. We discuss their practical advantages and disadvantages.

Indexed as

Cluster AnalysisDNA, BacterialGenotypeHumansLeptospiraMolecular Sequence DataMultilocus Sequence TypingSequence Analysis, DNADNA, Bacterial

Identifiers

PMID22087342
PMCPMC3210738

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.