Structure-based design of gRNA for Cas13.

Abstract:

:Cas13 endonuclease activity depends on the RNA local secondary structure with strong preference for single-stranded (SS) regions. Hence, it becomes indispensable to identify the SS regions for effective Cas13 mediated RNA knockdown. We herein present rational gRNA design by integrating experimental structure-seq data and predicted structural models. Utilizing structure-seq data for XIST transcript, we observed that gRNAs targeting the SS regions significantly induce transcript knockdown and cleavage than those targeting double-stranded (DS) regions. Further, we identified the "central seed region" in the gRNA that upon targeting the SS regions efficiently facilitates Cas13 mediated cleavage. In our following pursuits, we considered the scenario wherein experimental structure-seq data is not available, hence we used SS18-SSX2 fusion transcript indicated in synovial sarcomas and computationally predicted its structure. We observed that gRNAs targeting the SS regions predicted from the structure, efficiently induced necrosis compared to gRNAs that target the DS regions. In conclusion, for the effective RNA knockdown, the Cas13 mediated targeting strategy presented herein emphasizes the designing of gRNAs specifically targeting SS regions by utilizing structural information. Further, this strategy, in turn, can be anticipated to narrow the search space for gRNA design (by exclusively targeting SS regions) especially when lncRNAs are the targets.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Bandaru S,Tsuji MH,Shimizu Y,Usami K,Lee S,Takei NK,Yoshitome K,Nishimura Y,Otsuki T,Ito T

doi

10.1038/s41598-020-68459-4

subject

Has Abstract

pub_date

2020-07-14 00:00:00

pages

11610

issue

1

issn

2045-2322

pii

10.1038/s41598-020-68459-4

journal_volume

10

pub_type

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