Evidence map›Paper›PMID 22348138›Full record

ArticlePloS one2012

Prevalence and genetic characterization of pertactin-deficient Bordetella pertussis in Japan.

Nao Otsuka, Hyun-Ja Han, Hiromi Toyoizumi-Ajisaka, Yukitsugu Nakamura, Yoshichika Arakawa, Keigo Shibayama, Kazunari Kamachi

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 72 papers.

0numbers the graph read from it
0cells of the map it votes in
72citing papers in PubMed
13.9field-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

72 citing papers in PubMed, 143 citations in OpenAlex.

  1. Trial
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  3. CD4+ T-cell immunity toDiscover immunity · 2026
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  5. Resurgence of pertussis: whopping the '100-day cough'.Current opinion in pediatrics · 2025
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  8. Vaccine antigen-based genotyping ofMicrobiology spectrum · 2025
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  10. Frontiers in cellular and infection microbiology · 2025
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  12. Genomic epidemiology and multilevel genome typing ofEmerging microbes & infections · 2023
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  15. Article
  16. Evolution of Bordetella pertussis in the acellular vaccine era in Norway, 1996 to 2019.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2022
    Article
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  18. Can vaccines control bacterial virulence and pathogenicity?Evolution, medicine, and public health · 2022
    Review
  19. Review
  20. Article

12 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

7 authors at 1 institution in 1 country.

Nao OtsukaDepartment of Bacteriology II, National Institute of Infectious Diseases, Tokyo, Japan.
Hyun-Ja Han
Hiromi Toyoizumi-Ajisaka
Yukitsugu Nakamura
Yoshichika Arakawa
Keigo Shibayama
Kazunari Kamachi
National Institute of Infectious Diseases · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The adhesin pertactin (Prn) is one of the major virulence factors of Bordetella pertussis, the etiological agent of whooping cough. However, a significant prevalence of Prn-deficient (Prn(-)) B. pertussis was observed in Japan. The Prn(-) isolate was first discovered in 1997, and 33 (27%) Prn(-) isolates were identified among 121 B. pertussis isolates collected from 1990 to 2009. Sequence analysis revealed that all the Prn(-) isolates harbor exclusively the vaccine-type prn1 allele and that loss of Prn expression is caused by 2 different mutations: an 84-bp deletion of the prn signal sequence (prn1ΔSS, n = 24) and an IS481 insertion in prn1 (prn1::IS481, n = 9). The frequency of Prn(-) isolates, notably those harboring prn1ΔSS, significantly increased since the early 2000s, and Prn(-) isolates were subsequently found nationwide. Multilocus variable-number tandem repeat analysis (MLVA) revealed that 24 (73%) of 33 Prn(-) isolates belong to MLVA-186, and 6 and 3 Prn(-) isolates belong to MLVA-194 and MLVA-226, respectively. The 3 MLVA types are phylogenetically closely related, suggesting that the 2 Prn(-) clinical strains (harboring prn1ΔSS and prn1::IS481) have clonally expanded in Japan. Growth competition assays in vitro also demonstrated that Prn(-) isolates have a higher growth potential than the Prn(+) back-mutants from which they were derived. Our observations suggested that human host factors (genetic factors and immune status) that select for Prn(-) strains have arisen and that Prn expression is not essential for fitness under these conditions.

Indexed as

Bacterial Outer Membrane ProteinsBordetella pertussisHost-Pathogen InteractionsHumansJapanMolecular Sequence DataMutationPrevalenceSelection, GeneticSequence Analysis, DNAVaccinesVirulence FactorsVirulence Factors, BordetellaBacterial Outer Membrane ProteinspertactinVaccinesVirulence FactorsVirulence Factors, Bordetella

Identifiers

PMID22348138
PMCPMC3279416
OpenAlexW2010734188

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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.