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Engineering CRISPR guide RNAs for programmable RNA sensors

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BIOCHEMICAL SOCIETY TRANSACTIONS
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PORTLAND PRESS LTD
DOI: 10.1042/BST20221486

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The programmability of the CRISPR system based on Watson-Crick base pairing is a valuable feature in engineering RNA sensors. Despite the existence of successful RNA sensing approaches, the continuous expansion of CRISPR family members indicates the promising potential of CRISPR-based RNA sensors for various new functions and applications.
As the most valuable feature of the CRISPR system, the programmability based on Watson-Crick base pairing has been widely exploited in engineering RNA sensors. The base pairing in these systems offers a connection between the RNA of interest and the CRISPR effector, providing a highly specific mechanism for RNA detection both in vivo and in vitro. In the last decade, despite the many successful RNA sensing approaches developed during the era of CRISPR explosion, a deeper understanding of the character-istics of CRISPR systems and the continuous expansion of the CRISPR family members indicates that the CRISPR-based RNA sensor remains a promising area from which a variety of new functions and applications can be engineered. Here, we present a system-atic overview of the various strategies of engineering CRISPR gRNA for programmable RNA detection with an aim to clarify the role of gRNA's programmability among the present limitations and future development of CRISPR-enabled RNA sensors.

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