Integration of multiplex PCR and CRISPR-Cas allows highly specific detection of multidrug-resistant Acinetobacter Baumannii

Integration of multiplex PCR and CRISPR-Cas allows highly specific detection of multidrug-resistant Acinetobacter Baumannii
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多重 PCR 和 CRISPR-Cas 的集成可实现对多重耐药鲍曼不动杆菌的高度特异性检测

DOI:
10.1016/j.snb.2021.129600
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发表时间:
2021-05
期刊:
Sensors and Actuators: B. Chemical
影响因子:
--
通讯作者:
谢国明
谢国明
中科院分区:
其他
文献类型:
--
作者:
王玉凤;郭永灿;张力;杨宇君;杨双双;杨柳;陈华剑;刘成桂;李俊杰;谢国明

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细菌鉴定和表型药敏试验(p-AST)在很大程度上限制了临床患者及时抗感染治疗。本研究建立了一种快速检测多重耐药鲍曼不动杆菌(MDRAB)的CRISPR-Cas芯片平台。该平台采用多重PCR扩增策略,可同时扩增鲍曼不动杆菌(Acinetobacter baumannii,A.鲍曼不动杆菌),伴随LbaCas 12 a的无差别单链DNA酶活性,以产生多重PCR产物的单一荧光信号。对A.鲍曼不动杆菌在2 h内完成检测,检出限可达50 CFU/mL。此外,我们还证明了区分引物二聚体的特异性。这些发现共同证明了CRISPR-Cas 12 a方法在高通量和高特异性的多基因检测中的最终潜力。鉴于CRISPR-Cas 12 a平台的多功能性和普适性,预计该研究将进一步推动其在多重耐药菌诊断和治疗中的应用。
Bacterial identification and phenotypic antibiotic susceptibility test (p-AST) limit timely anti-infection treatment of patients in clinic to a large extent. Here, we develop a rapid platform integrated multiplex PCR with CRISPR-Cas array to detect multidrug-resistantAcinetobacter baumannii(MDRAB). The platform relies on multiplex PCR amplification strategy which can simultaneously amplify the house-keeping gene and 4 β-lactamase genes ofAcinetobacter baumannii(A. baumannii), accompanying with the indiscriminate single-stranded DNase activity of LbaCas12a to generate a single fluorescent signal for multiplex PCR products. The genotypic antibiotic susceptibility test (g-AST) ofA. baumanniiwas completed within 2 h, with a detection limit down to 50 CFU/mL. In addition, we also proved the specificity to differentiate primer dimers. These findings jointly demonstrate the ultimate potential of the CRISPR-Cas12a method for multiple genes detection with high throughput and high specificity. Given the versatility and universality of CRISPR-Cas12a platform, it is expected that this research will further promote its application in the diagnosis and treatment of multidrug-resistant bacteria.
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