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Comment
. 2017 Jan 3;114(1):15-16.
doi: 10.1073/pnas.1618747114. Epub 2016 Dec 20.

Sensing danger

Affiliations
Comment

Sensing danger

Luciano A Marraffini. Proc Natl Acad Sci U S A. .
No abstract available

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Conflict of interest statement

The author declares no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Regulation of CRISPR-Cas activity by QS. At low cell density, low autoinducer (pink dot) concentrations result in the repression of CRISPR-cas loci through the QS pathway, keeping the CRISPR-Cas immune response at a minimum. In contrast, at high densities of bacteria (when they are most susceptible to phage attack) the increase in the concentration of autoinducer triggers the de-repression of CRISPR-cas loci. Expression of the Cas protein complex and crRNA guide prepares the cell for the cleavage (arrowhead) of incoming viruses.

Comment on

References

    1. Barrangou R, et al. CRISPR provides acquired resistance against viruses in prokaryotes. Science. 2007;315(5819):1709–1712. - PubMed
    1. Marraffini LA, Sontheimer EJ. CRISPR interference limits horizontal gene transfer in staphylococci by targeting DNA. Science. 2008;322(5909):1843–1845. - PMC - PubMed
    1. Bolotin A, Quinquis B, Sorokin A, Ehrlich SD. Clustered regularly interspaced short palindrome repeats (CRISPRs) have spacers of extrachromosomal origin. Microbiology. 2005;151(Pt 8):2551–2561. - PubMed
    1. Mojica FJ, Díez-Villaseñor C, García-Martínez J, Soria E. Intervening sequences of regularly spaced prokaryotic repeats derive from foreign genetic elements. J Mol Evol. 2005;60(2):174–182. - PubMed
    1. Pourcel C, Salvignol G, Vergnaud G. CRISPR elements in Yersinia pestis acquire new repeats by preferential uptake of bacteriophage DNA, and provide additional tools for evolutionary studies. Microbiology. 2005;151(Pt 3):653–663. - PubMed