Abstract
Site-specific nucleases (SSNs) have drawn much attention in plant biotechnology due to their ability to drive precision mutagenesis, gene targeting or allele replacement. However, when devoid of its nuclease activity, the underlying DNA-binding activity of SSNs can be used to bring other protein functional domains close to specific genomic sites, thus expanding further the range of applications of the technology. In particular, the addition of functional domains encoding epigenetic effectors and chromatin modifiers to the CRISPR/Cas ribonucleoprotein complex opens the possibility to introduce targeted epigenomic modifications in plants in an easily programmable manner. Here we examine some of the most important agronomic traits known to be controlled epigenetically and review the best studied epigenetic catalytic effectors in plants, such as DNA methylases/demethylases or histone acetylases/deacetylases and their associated marks. We also review the most efficient strategies developed to date to functionalize Cas proteins with both catalytic and non-catalytic epigenetic effectors, and the ability of these domains to influence the expression of endogenous genes in a regulatable manner. Based on these new technical developments, we discuss the possibilities offered by epigenetic editing tools in plant biotechnology and their implications in crop breeding.
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Acknowledgements
This work has been funded by the PID2019-108203RB-100 Plan Nacional I+D project from the Spanish Ministry of Science and Innovation. Sara Selma is recipient of FPI fellowships associated with BIO2016-78601-R Grant from the same funding source.
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Selma, S., Orzáez, D. Perspectives for epigenetic editing in crops. Transgenic Res 30, 381–400 (2021). https://doi.org/10.1007/s11248-021-00252-z
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DOI: https://doi.org/10.1007/s11248-021-00252-z