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Approaches for the sensitive detection of rare base and prime editing events

Nguyen Tran, MT, KC, R ORCID: 0000-0002-6403-8919, Patterson, FM, Liu, G-S ORCID: 0000-0003-3379-724X, Cook, AL ORCID: 0000-0003-1770-7910 and Hewitt, AW ORCID: 0000-0002-5123-5999 2021 , 'Approaches for the sensitive detection of rare base and prime editing events' , Methods , doi: 10.1016/j.ymeth.2021.01.006.

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Precision chemistry entailing user-directed nucleotide substitutions and template-specified repair can be facilitated by base editing and prime editing, respectively. Recently, the diversification of adenine, cytosine, andprime editor variants obliges a considered, high-throughput evaluation of these tools for optimized, end-pointapplications. Herein, we outline novel, cost-effective and scalable approaches for the rapid detection of baseediting and prime editing outcomes using gel electrophoresis. For base editing, we exploit primer mismatchamplification (SNP genotyping) for the gel-based detection of base editing efficiencies as low as 0.1%. For primeediting, we describe a one-pot reaction combining polymerase chain reaction (PCR) amplification of the targetregion with restriction digestion (restriction fragment length polymorphism; RFLP). RFLP enables the rapiddetection of insertion or deletion events in under 2.5 h from genomic DNA extraction. We show that our methodof SNP genotyping is amenable to both endogenous target loci as well as transfected, episomal plasmid targets inBHK-21 cells. Next, we validate the incidence of base and prime editing by describing Sanger sequencing andnext-generation sequencing (NGS) workflows for the accurate validation and quantification of on-target editingefficiencies. Our workflow details three different methods for the detection of rare base and prime editing events,enabling a tiered approach from low to high resolution that makes use of gel electrophoresis, Sanger sequencing,and NGS.

Item Type: Article
Authors/Creators:Nguyen Tran, MT and KC, R and Patterson, FM and Liu, G-S and Cook, AL and Hewitt, AW
Keywords: CRISPR, gene editing, base editing, prime editing
Journal or Publication Title: Methods
Publisher: Academic Press Inc Elsevier Science
ISSN: 1046-2023
DOI / ID Number: 10.1016/j.ymeth.2021.01.006
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© 2021 Elsevier Inc. All rights reserved.

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