Evidence map›Paper›PMID 23918778›Full record

ArticleInfection and immunity2013

Deletion of arcD in Streptococcus pneumoniae D39 impairs its capsule and attenuates virulence.

Radha Gupta, Jun Yang, Yimin Dong, Edwin Swiatlo, Jing-Ren Zhang, Dennis W Metzger, Guangchun Bai

Open access · bronzeAbstract read
In one paragraph

Article in Infection and immunity, 2013. 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
2.4field-weighted citation impact, top 11% 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, 29 citations in OpenAlex.

  1. Review
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  5. MgaVirulence · 2021
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  13. Panel 4: Report of the Microbiology Panel.Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery · 2017
    Review
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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

7 authors at 3 institutions in 1 country.

Radha GuptaCenter for Immunology and Microbial Disease, Albany Medical College, Albany, New York, USA.
Jun Yang
Yimin Dong
Edwin Swiatlo
Jing-Ren Zhang
Dennis W Metzger
Guangchun Bai
Albany Medical Center Hospital · USJackson Memorial Hospital · USNew York State Department of Health · US

Funding

Otitis Media-associated pneumococcal genesR01DC006917 · NIDCD · ALBANY MEDICAL COLLEGE · PI METZGER, DENNIS W, YAN, HONGGAO · 2004 to 2014
$4.1M
NIDCD NIH HHS DC006917NIDCD NIH HHS R01 DC006917
6 · The paper itself

Abstract

The arginine deiminase system (ADS) is associated with arginine catabolism and plays a role in virulence of several pathogenic bacteria. In Streptococcus pneumoniae, the ADS genes exist as a locus consisting of arcABCDT. A recent genome-wide mutagenesis approach revealed that both arcD and arcT are potentially essential in a chinchilla otitis media (OM) model. In the present study, we generated ΔarcD, ΔarcT, and ΔarcDT mutants by homologous recombination and evaluated their infectivity. Our results showed that only arcD, and not arcT, of an OM isolate is required during chinchilla middle ear infection. Additionally, D39 ΔarcD exhibited enhanced nasopharyngeal colonization and was attenuated in both mouse pneumonia and bacteremia models. In vitro, D39 ΔarcD displayed enhanced adherence to A549 epithelial cells and increased phagocytosis by J774A.1 macrophages compared to those with the parental strain. This mutant also exhibited an impaired capsule, as detected using electron microscopy, immunofluorescence, and a capsule assay. We demonstrated that the capsule defect in the D39 ΔarcD mutant may not be associated with a deficiency in arginine but rather is likely caused by a loss of interaction between the capsule and the transmembrane protein ArcD.

Indexed as

Amino Acid Transport SystemsAnimalsAntiportersBacteremiaBacterial CapsulesBacterial ProteinsCell LineChinchillaGene Expression Regulation, BacterialHumansMiceMutationOtitis MediaPneumonia, BacterialStreptococcus pneumoniaeVirulenceAmino Acid Transport SystemsAntiportersArcD protein, BacteriaBacterial Proteins

Identifiers

PMID23918778
PMCPMC3811789
OpenAlexW2167617557

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.