清脆的
生物
计算生物学
基因组
病毒学
基因组编辑
严重急性呼吸综合征冠状病毒2型(SARS-CoV-2)
核糖核酸
遗传学
2019年冠状病毒病(COVID-19)
基因
医学
病理
传染病(医学专业)
疾病
作者
Ooi Kh,Tay Jwd,Teo Sy,Liu Mm,Pornchai Kaewsapsak,Jin S,Yong-Gui Gao,Meng How Tan
标识
DOI:10.1101/2020.07.03.185850
摘要
Abstract Extensive testing is essential to break the transmission of the new coronavirus SARS-CoV-2, which causes the ongoing COVID-19 pandemic. Recently, CRISPR-based diagnostics have emerged as attractive alternatives to quantitative real-time PCR due to their faster turnaround time and their potential to be used in point-of-care testing scenarios. However, existing CRISPR-based assays for COVID-19 have not considered viral genome mutations and RNA editing in human cells. Here, we present the VaNGuard (Variant Nucleotide Guard) test that is not only specific and sensitive for SARS-CoV-2, but can also detect the virus when its genome or transcriptome has evolved or has been edited by deaminases in infected human cells. We show that an engineered AsCas12a enzyme is more tolerant of mismatches than wildtype LbCas12a and that multiplexed Cas12a targeting can overcome the presence of single nucleotide variations. Our assay can be completed in 30 minutes with a dipstick for a rapid point-of-care test.
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