Evidence map›Paper›PMID 20974819›Full record

ArticleInfection and immunity2011

Infectivity acts as in vivo selection for maintenance of the chlamydial cryptic plasmid.

Marsha Russell, Toni Darville, Kumar Chandra-Kuntal, Bennett Smith, Charles W Andrews, Catherine M O'Connell

Open access · greenAbstract read
In one paragraph

Article in Infection and immunity, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers.

0numbers the graph read from it
0cells of the map it votes in
33citing papers in PubMed
3.4field-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

33 citing papers in PubMed, 50 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Plasmid-mediated virulence inFrontiers in cellular and infection microbiology · 2023
    Review
  5. Article
  6. Article
  7. Article
  8. Review
  9. Article
  10. TheWellcome open research · 2018
    Article
  11. Chlamydial Plasmid-Dependent Pathogenicity.Trends in microbiology · 2017
    Review
  12. Microbial cell (Graz, Austria) · 2016
    Review
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Review
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

6 authors at 1 institution in 1 country.

Marsha RussellDepartment of Pediatrics, Children's Hospital of Pittsburgh of UPMC, One Children's Hospital Drive, 4401 Penn Avenue, Pittsburgh, PA 15224, USA.
Toni Darville
Kumar Chandra-Kuntal
Bennett Smith
Charles W Andrews
Catherine M O'Connell
Children's Hospital of Pittsburgh · US

Funding

Cell Death and Innate Immunity in Chlamydial InfectionR01AI054624 · NIAID · UNIV OF NORTH CAROLINA CHAPEL HILL · PI DARVILLE, TONI · 2003 to 2014
$3.2M
NIAID NIH HHS R01 AI054624
6 · The paper itself

Abstract

Chlamydia trachomatis contains a conserved ∼7.5-kb plasmid. Loss of the plasmid results in reduced glycogen accumulation, failure to activate TLR2, and reduced infectivity. We hypothesized that reduced infectivity functions as a means of selection for plasmid maintenance. We directly examined the biological significance of the reduced infectivity associated with plasmid deficiency by determining the relative fitness of plasmid-deficient CM972 versus that of wild-type C. muridarum Nigg in mixed inocula in vitro and in vivo. C. muridarum Nigg rapidly out-competed its plasmid-cured derivative CM972 in vitro but was not competitive with CM3.1, a derivative of CM972 that has reverted to a normal infectivity phenotype. C. muridarum Nigg also effectively competed with CM972 during lower and upper genital tract infection in the mouse, demonstrating that strong selective pressure for plasmid maintenance occurs during infection. The severity of oviduct inflammation and dilatation resulting from these mixed infections correlated directly with the amount of C. muridarum Nigg in the initial inoculum, confirming the role of the plasmid in virulence. Genetic characterization of CM972 and CM3.1 revealed no additional mutations (other than loss of the plasmid) to account for the reduced infectivity of CM972 and detected a single base substitution in TC_0236 in CM3.1 that may be responsible for its restored infectivity. These data demonstrate that a chlamydial strain that differs genetically from its wild-type parent only with respect to the lack of the chlamydial plasmid is unable to compete in vitro and in vivo, likely explaining the rarity of plasmid-deficient isolates in nature.

Indexed as

Amino Acid SequenceAnimalsBacterial ProteinsBacterial SheddingBase SequenceCell LineChlamydia InfectionsChlamydia muridarumFemaleMiceMice, Inbred C57BLMolecular Sequence AnnotationPlasmidsTime FactorsVaginosis, BacterialBacterial Proteins

Identifiers

PMID20974819
PMCPMC3019909
OpenAlexW2168349030

What OpenQuestion holds

Textmetadata
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.