Targeted DNA excision in Arabidopsis by a re-engineered homing endonuclease

BMC Biotechnology

Mauricio S Antunes²  J Jeff Smith¹  Derek Jantz¹  June I Medford² 

[1] Precision BioSciences, 302 East Pettigrew Street, Dibrell Building, Suite A-100, Durham, North Carolina 27701, USA

[2] Department of Biology, Colorado State University, Fort Collins, Colorado 80523, USA

关键词: Targeted marker excision;    I-CreI;    Homing endonuclease;   

Others  :  1134529
DOI  :  10.1186/1472-6750-12-86

 received in 2012-03-12, accepted in 2012-10-26,  发布年份 2012

【 摘 要 】

Background

A systematic method for plant genome manipulation is a major aim of plant biotechnology. One approach to achieving this involves producing a double-strand DNA break at a genomic target site followed by the introduction or removal of DNA sequences by cellular DNA repair. Hence, a site-specific endonuclease capable of targeting double-strand breaks to unique locations in the plant genome is needed.

Results

We engineered and tested a synthetic homing endonuclease, PB1, derived from the I-CreI endonuclease of Chlamydomonas reinhardtii, which was re-designed to recognize and cleave a newly specified DNA sequence. We demonstrate that an activity-optimized version of the PB1 endonuclease, under the control of a heat-inducible promoter, is capable of targeting DNA breaks to an introduced PB1 recognition site in the genome of Arabidopsis thaliana. We further demonstrate that this engineered endonuclease can very efficiently excise unwanted transgenic DNA, such as an herbicide resistance marker, from the genome when the marker gene is flanked by PB1 recognition sites. Interestingly, under certain conditions the repair of the DNA junctions resulted in a conservative pairing of recognition half sites to remove the intervening DNA and reconstitute a single functional recognition site.

Conclusion

These results establish parameters needed to use engineered homing endonucleases for the modification of endogenous loci in plant genomes.

【 授权许可】

   
2012 Antunes et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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