Evidence map›Paper›PMID 21573110›Full record

ArticlePloS one2011

CRISPR inhibition of prophage acquisition in Streptococcus pyogenes.

Takashi Nozawa, Nayuta Furukawa, Chihiro Aikawa, Takayasu Watanabe, Bijaya Haobam, Ken Kurokawa, Fumito Maruyama, Ichiro Nakagawa

Abstract read
In one paragraph

Article in PloS one, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 66 papers.

0numbers the graph read from it
0cells of the map it votes in
66citing papers in PubMed
–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

66 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Review
  5. Article
  6. Article
  7. CRISPR typing and phage content of colonizing Group BFrontiers in cellular and infection microbiology · 2025
    Article
  8. Evaluating the Safety ofMicroorganisms · 2024
    Article
  9. Article
  10. Review
  11. Review
  12. Article
  13. Article
  14. Comparing Genomic Characteristics ofAnnals of laboratory medicine · 2022
    Article
  15. Review
  16. Challenges of CRISPR-Based Gene Editing in Primary T Cells.International journal of molecular sciences · 2022
    Review
  17. Review
  18. CRISPR inactivation by integration.Nature microbiology · 2021
    Article
  19. Article
  20. Article

6 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

8 authors.

Takashi NozawaSection of Bacterial Pathogenesis, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Nayuta Furukawa
Chihiro Aikawa
Takayasu Watanabe
Bijaya Haobam
Ken Kurokawa
Fumito Maruyama
Ichiro Nakagawa

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Streptococcus pyogenes, one of the major human pathogens, is a unique species since it has acquired diverse strain-specific virulence properties mainly through the acquisition of streptococcal prophages. In addition, S. pyogenes possesses clustered regularly interspaced short palindromic repeats (CRISPR)/Cas systems that can restrict horizontal gene transfer (HGT) including phage insertion. Therefore, it was of interest to examine the relationship between CRISPR and acquisition of prophages in S. pyogenes. Although two distinct CRISPR loci were found in S. pyogenes, some strains lacked CRISPR and these strains possess significantly more prophages than CRISPR harboring strains. We also found that the number of spacers of S. pyogenes CRISPR was less than for other streptococci. The demonstrated spacer contents, however, suggested that the CRISPR appear to limit phage insertions. In addition, we found a significant inverse correlation between the number of spacers and prophages in S. pyogenes. It was therefore suggested that S. pyogenes CRISPR have permitted phage insertion by lacking its own spacers. Interestingly, in two closely related S. pyogenes strains (SSI-1 and MGAS315), CRISPR activity appeared to be impaired following the insertion of phage genomes into the repeat sequences. Detailed analysis of this prophage insertion site suggested that MGAS315 is the ancestral strain of SSI-1. As a result of analysis of 35 additional streptococcal genomes, it was suggested that the influences of the CRISPR on the phage insertion vary among species even within the same genus. Our results suggested that limitations in CRISPR content could explain the characteristic acquisition of prophages and might contribute to strain-specific pathogenesis in S. pyogenes.

Indexed as

DNA, IntergenicGenetic LociGenome, BacterialHumansInverted Repeat SequencesPhylogenyProphagesRecombination, GeneticSequence DeletionStreptococcus pyogenesVirus IntegrationDNA, Intergenic

Identifiers

PMID21573110
PMCPMC3089615

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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.