Abstract:
BACKGROUND:The CRISPR-Cas9 system is a powerful and versatile tool for crop genome editing. However, achieving highly efficient and specific editing in polyploid species can be a challenge. The efficiency and specificity of the CRISPR-Cas9 system depends critically on the gRNA used. Here, we assessed the activities and specificities of seven gRNAs targeting 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) in hexaploid wheat protoplasts. EPSPS is the biological target of the widely used herbicide glyphosate. RESULTS:The seven gRNAs differed substantially in their on-target activities, with mean indel frequencies ranging from 0% to approximately 20%. There was no obvious correlation between experimentally determined and in silico predicted on-target gRNA activity. The presence of a single mismatch within the seed region of the guide sequence greatly reduced but did not abolish gRNA activity, whereas the presence of an additional mismatch, or the absence of a PAM, all but abolished gRNA activity. Large insertions (≥20 bp) of DNA vector-derived sequence were detected at frequencies up to 8.5% of total indels. One of the gRNAs exhibited several properties that make it potentially suitable for the development of non-transgenic glyphosate resistant wheat. CONCLUSIONS:We have established a rapid and reliable method for gRNA validation in hexaploid wheat protoplasts. The method can be used to identify gRNAs that have favourable properties. Our approach is particularly suited to polyploid species, but should be applicable to any plant species amenable to protoplast transformation.
journal_name
BMC Biotechnoljournal_title
BMC biotechnologyauthors
Arndell T,Sharma N,Langridge P,Baumann U,Watson-Haigh NS,Whitford Rdoi
10.1186/s12896-019-0565-zsubject
Has Abstractpub_date
2019-10-30 00:00:00pages
71issue
1issn
1472-6750pii
10.1186/s12896-019-0565-zjournal_volume
19pub_type
杂志文章abstract:BACKGROUND:A method for inhibiting the expression of particular genes using external guide sequences (EGSs) has been developed in bacteria, mammalian cells and maize cells. RESULTS:To examine whether EGS technology can be used to down-regulate gene expression in Caenorhabditis elegans (C. elegans), we generated EGS-Ng...
journal_title:BMC biotechnology
pub_type: 杂志文章
doi:10.1186/1472-6750-9-47
更新日期:2009-05-20 00:00:00
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journal_title:BMC biotechnology
pub_type: 杂志文章
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journal_title:BMC biotechnology
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journal_title:BMC biotechnology
pub_type: 杂志文章
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更新日期:2007-11-19 00:00:00
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更新日期:2012-04-26 00:00:00
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更新日期:2013-11-04 00:00:00
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更新日期:2010-05-13 00:00:00
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更新日期:2007-02-15 00:00:00
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更新日期:2010-02-17 00:00:00
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更新日期:2009-03-31 00:00:00
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更新日期:2001-01-01 00:00:00
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更新日期:2005-09-01 00:00:00
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更新日期:2006-02-10 00:00:00
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更新日期:2020-01-16 00:00:00
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更新日期:2015-12-10 00:00:00
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journal_title:BMC biotechnology
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更新日期:2011-12-30 00:00:00
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更新日期:2014-09-03 00:00:00