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© Antoinette Ryter
Serratia marcescens avec présence de flagelles (cils) péritriches. Famille des Enterobacteriaceae, bacille à Gram négatif, non sporulé, anaérobie facultatif, mobile, parfois encapsulé, pouvant synthétiser un pigment rouge ou rose. Présent dans les végétaux , le sol, et l'eau. A l'origine d'infections nosocomiales et résistant à de nombreux antibiotiques. Image colorisée.
Publication : Nature biotechnology

RNA-guided editing of bacterial genomes using CRISPR-Cas systems

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature biotechnology - 29 Jan 2013

Jiang W, Bikard D, Cox D, Zhang F, Marraffini LA

Link to Pubmed [PMID] – 23360965

Nat. Biotechnol. 2013 Mar;31(3):233-9

Here we use the clustered, regularly interspaced, short palindromic repeats (CRISPR)-associated Cas9 endonuclease complexed with dual-RNAs to introduce precise mutations in the genomes of Streptococcus pneumoniae and Escherichia coli. The approach relies on dual-RNA:Cas9-directed cleavage at the targeted genomic site to kill unmutated cells and circumvents the need for selectable markers or counter-selection systems. We reprogram dual-RNA:Cas9 specificity by changing the sequence of short CRISPR RNA (crRNA) to make single- and multinucleotide changes carried on editing templates. Simultaneous use of two crRNAs enables multiplex mutagenesis. In S. pneumoniae, nearly 100% of cells that were recovered using our approach contained the desired mutation, and in E. coli, 65% that were recovered contained the mutation, when the approach was used in combination with recombineering. We exhaustively analyze dual-RNA:Cas9 target requirements to define the range of targetable sequences and show strategies for editing sites that do not meet these requirements, suggesting the versatility of this technique for bacterial genome engineering.

http://www.ncbi.nlm.nih.gov/pubmed/23360965