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CRISPR Interference Limits Horizontal Gene Transfer in Staphylococci by Targeting DNA

Marraffini, Luciano A., Sontheimer, Erik J.·2008·Science

Abstract

Horizontal gene transfer (HGT) in bacteria and archaea occurs through phage transduction, transformation, or conjugation, and the latter is particularly important for the spread of antibiotic resistance. Clustered, regularly interspaced, short palindromic repeat (CRISPR) loci confer sequence-directed immunity against phages. A clinical isolate of Staphylococcus epidermidis harbors a CRISPR spacer that matches the nickase gene present in nearly all staphylococcal conjugative plasmids. Here we show that CRISPR interference prevents conjugation and plasmid transformation in S. epidermidis . Insertion of a self-splicing intron into nickase blocks interference despite the reconstitution of the target sequence in the spliced mRNA, which indicates that the interference machinery targets DNA directly. We conclude that CRISPR loci counteract multiple routes of HGT and can limit the spread of antibiotic resistance in pathogenic bacteria.

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Metadata

Authors
Marraffini, L. A., & Sontheimer, E. J.
Affiliations
Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA.
Venue
Science
Published
2008-12-19
Volume
322
Issue
5909
Pages
1843-1845
ISSN
  • 0036-8075
  • 1095-9203
Cited by
1,642
References
0
Language
en

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