Guide RNA Categorization Enables Target Site Choice in Tn7-CRISPR-Cas Transposons.
Guide RNA Categorization Enables Target Site Choice in Tn7-CRISPR-Cas Transposons.
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DOI:
10.1016/j.cell.2020.11.005
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发表时间:
2020-12-23
期刊:
影响因子:
64.5
通讯作者:
Peters JE
中科院分区:
文献类型:
--
作者:
Petassi MT;Hsieh SC;Peters JE
CRISPR-Cas defense systems have been coopted multiple times in nature for guide RNA-directed transposition by Tn7-like elements. Prototypic Tn7 uses dedicated proteins for two targeting pathways, one targeting a neutral and conserved attachment site in the chromosome and a second directing transposition into mobile plasmids facilitating cell-to-cell transfer. We show that Tn7-CRISPR-Cas elements evolved a system of guide RNA categorization to accomplish the same two-pathway lifestyle. Multiple mechanisms allow functionally distinct guide RNAs for transposition, a conventional system capable of acquiring guide RNAs to new plasmid and phage targets and a second providing long-term memory for access to chromosomal sites upon entry into a new host. Guide RNAs are privatized to be recognized only by the transposon-adapted system via sequence-specialization, mismatch tolerance and selective regulation to avoid toxic self-targeting by endogenous CRISPR-Cas defense systems. This information reveals promising avenues to engineer guide RNAs for enhanced CRISPR-Cas functionality for genome modification. Transposons have coopted CRISPR-Cas systems for RNA-guided transposition, using mechanisms that allow for target site choice, and that prevent guide RNA use by canonical CRISPR-Cas systems—features that could be useful for biotech applications.
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DOI:
10.1093/bioinformatics/btt509
发表时间:
2013-11-15
期刊:
Bioinformatics (Oxford, England)
影响因子:
--
作者:
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通讯作者:
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影响因子:
3.7
作者:
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DOI:
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发表时间:
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期刊:
Bioinformatics (Oxford, England)
影响因子:
--
作者:
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通讯作者:
de Hoon MJ
影响因子:
2.8
作者:
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通讯作者:
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影响因子:
64.5
作者:
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通讯作者:
CRAIG, NL