Anti-cas spacers in orphan CRISPR4 arrays prevent uptake of active CRISPR–Cas I-F systems

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Title: Anti-cas spacers in orphan CRISPR4 arrays prevent uptake of active CRISPR–Cas I-F systems
Authors: Almendros, Cristóbal | Guzmán, Noemí M. | García-Martínez, Jesús | Mojica, Francisco J.M.
Research Group/s: Microbiología Molecular
Center, Department or Service: Universidad de Alicante. Departamento de Fisiología, Genética y Microbiología
Keywords: CRISPR | Anti-cas spacers | crRNA | Bacterial genetics
Knowledge Area: Microbiología
Issue Date: 6-Jun-2016
Publisher: Macmillan Publishers
Citation: Nature Microbiology. 2016, 1:16081. doi:10.1038/nmicrobiol.2016.81
Abstract: Archaea and bacteria harbour clustered regularly interspaced short palindromic repeats (CRISPR) loci. These arrays encode RNA molecules (crRNA), each containing a sequence of a single repeat–intervening spacer. The crRNAs guide CRISPR-associated (Cas) proteins to cleave nucleic acids complementary to the crRNA spacer, thus interfering with targeted foreign elements. Notably, pre-existing spacers may trigger the acquisition of new spacers from the target molecule by means of a primed adaptation mechanism. Here, we show that naturally occurring orphan CRISPR arrays that contain spacers matching sequences of the cognate (absent) cas genes are able to elicit both primed adaptation and direct interference against genetic elements carrying those genes. Our findings show the existence of an anti-cas mechanism that prevents the transfer of a fully equipped CRISPR–Cas system. Hence, they suggest that CRISPR immunity may be undesired by particular prokaryotes, potentially because they could limit possibilities for gaining favourable sequences by lateral transfer.
Sponsor: This work was supported by the Ministerio de Economía y Competitividad (BIO2011-24417 and BIO2014-53029-P) and the Consellería D’Educació, Cultura i Esport, Generalitat Valenciana (ACOMP/2014/135).
ISSN: 2058-5276
DOI: 10.1038/nmicrobiol.2016.81
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Macmillan Publishers Limited
Peer Review: si
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Appears in Collections:INV - Microbiología Molecular - Artículos de Revistas

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