Multiplexed activation in mammalian cells using a split-intein CRISPR/Cas12a based synthetic transcription factor.

Multiplexed activation in mammalian cells using a split-intein CRISPR/Cas12a based synthetic transcription factor.
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DOI:
10.1093/nar/gkab1191
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发表时间:
2022-01-11
影响因子:
14.9
通讯作者:
Rosser SJ
Rosser SJ
中科院分区:
生物学2区
文献类型:
--
作者:
Bryson JW;Auxillos JY;Rosser SJ

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The adoption of CRISPR systems for the generation of synthetic transcription factors has greatly simplified the process for upregulating endogenous gene expression, with a plethora of applications in cell biology, bioproduction and cell reprogramming. The recently discovered CRISPR/Cas12a (Cas12a) systems offer extended potential, as Cas12a is capable of processing its own crRNA array, to provide multiple individual crRNAs for subsequent targeting from a single transcript. Here we show the application of dFnCas12a-VPR in mammalian cells, with the Francisella novicida Cas12a (FnCas12a) possessing a shorter PAM sequence than Acidaminococcus sp. (As) or Lachnospiraceae bacterium (Lb) variants, enabling denser targeting of genomic loci, while performing just as well or even better than the other variants. We observe that synergistic activation and multiplexing can be achieved using crRNA arrays but also show that crRNAs expressed towards the 5′ of 6-crRNA arrays show evidence of enhanced activity. This not only represents a more flexible tool for transcriptional modulation but further expands our understanding of the design capabilities and limitations when considering longer crRNA arrays for multiplexed targeting.
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