Article (Scientific journals)
CRISPR-Cas9-mediated efficient directed mutagenesis and RAD51-dependent and RAD51-independent gene targeting in the moss Physcomitrella patens
Collonnier, Cécile; Epert, Aline; Mara, Kostlend et al.
2017In Plant Biotechnology Journal, 15, p. 122-131
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Keywords :
CRISPR-Cas9; Physcomitrella patens; genome editing; alt-EJ; gene targeting; RAD51
Abstract :
[en] The ability to address the CRISPR-Cas9 nuclease complex to any target DNA using customizable single-guide RNAs has now permitted genome engineering in many species. Here, we report its first successful use in a nonvascular plant, the moss Physcomitrella patens. Single-guide RNAs (sgRNAs) were designed to target an endogenous reporter gene, PpAPT, whose inactivation confers resistance to 2-fluoroadenine. Transformation of moss protoplasts with these sgRNAs and the Cas9 coding sequence from Streptococcus pyogenes triggered mutagenesis at the PpAPT target in about 2% of the regenerated plants. Mainly, deletions were observed, most of them resulting from alternative end-joining (alt-EJ)-driven repair. We further demonstrate that, in the presence of a donor DNA sharing sequence homology with the PpAPT gene, most transgene integration events occur by homology-driven repair (HDR) at the target locus but also that Cas9- induced double-strand breaks are repaired with almost equal frequencies by mutagenic illegitimate recombination. Finally, we establish that a significant fraction of HDR-mediated gene targeting events (30%) is still possible in the absence of PpRAD51 protein, indicating that CRISPR-induced HDR is only partially mediated by the classical homologous recombination pathway.
Disciplines :
Biotechnology
Author, co-author :
Collonnier, Cécile;  INRA Centre de Versailles-Grignon, Versailles Cedex, France > Institut Jean-Pierre Bourgin (UMR1318) > Méiose et Recombinaison
Epert, Aline;  INRA Centre de Versailles-Grignon, Versailles Cedex, France > Institut Jean-Pierre Bourgin > Méiose et Recombinaison
Mara, Kostlend;  INRA Centre de Versailles-Grignon, Versailles Cedex, France > Institut Jean-Pierre Bourgin (UMR1318) > Méiose et Recombinaison
Maclot, François  ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Gestion durable des bio-agresseurs
Guyon-Debast, Anouchkla;  INRA Centre de Versailles-Grignon, Versailles Cedex, France > Institut Jean-Pierre Bourgin (UMR1318) > Méiose et Recombinaison
Charlot, Florence;  INRA Centre de Versailles-Grignon, Versailles Cedex, France > Institut Jean-Pierre Bourgin (UMR1318) > Méiose et Recombinaison
White, Charles;  Institut Blaise Pascal, Clermont Ferran, France > Génétique, Reproduction et Développement, UMR CNRS 6293
Schaefer, Didier G.;  Université de Neuchâtel, Neuchâtel, Suisse > Institut de Biologie > Laboratoire de Biologie Moléculaire et Cellulaire
Nogué, Fabien;  INRA Centre de Versailles-Grignon, Versailles Cedex, France > Institut Jean-Pierre Bourgin (UMR1318) > Méiose et Recombinaison
Language :
English
Title :
CRISPR-Cas9-mediated efficient directed mutagenesis and RAD51-dependent and RAD51-independent gene targeting in the moss Physcomitrella patens
Publication date :
2017
Journal title :
Plant Biotechnology Journal
ISSN :
1467-7644
eISSN :
1467-7652
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
15
Pages :
122-131
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 May 2017

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