Rapid molecular diagnostic technology is very useful in many areas, including public health, environmental testing and criminal investigation. We recently showed that Cas12a had trans-cleavage activity upon collateral single-stranded DNA (ssDNA), with which the HOLMES platform (one-HOur Low-cost Multipurpose highly Efficient System) was developed. Here, we combine the thermophilic Cas12b, which also has the ssDNA trans-cleavage activity, with Loop-Mediated Isothermal Amplification (LAMP), and create HOLMESv2. In HOLMESv2, LAMP amplification and Cas12b trans-cleavage can be integrated into a one-step system with a constant temperature, which therefore brings much convenience in nucleic acid detection. Moreover, we also simplify the RNA detection procedures in HOLMESv2, using an RNA-dependent DNA polymerase for amplification and therefore omitting an extra reverse transcription step.
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