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The application of DNA polymerases and Cas9 as representative of DNA-modifying enzymes group in DNA sensor design (review) #MMPMID33303323
Dronina J; Bubniene US; Ramanavicius A
Biosens Bioelectron 2021[Mar]; 175 (ä): 112867 PMID33303323show ga
Rapid detection of nucleic acids (DNA or RNA) by inexpensive, selective, accurate, and highly sensitive methods is very important for biosensors. DNA-sensors based on DNA-modifying enzymes for fast determination and monitoring of pathogenic (Zika, Dengue, SARS-Cov-2 (inducer of COVID-19), human papillomavirus, HIV, etc.) viruses and diagnosis of virus-induced diseases is a key factor of this overview. Recently, DNA-modifying enzymes (Taq DNA polymerase, Phi29 DNA polymerase) have been widely used for the diagnosis of virus or pathogenic disease by gold standard (PCR, qPCR, RT-qPCR) methods, therefore, alternative methods have been reviewed. The main mechanisms of DNA metabolism (replication cycle, amplification) and the genomeediting tool CRISPR-Cas9 are purposefully discussed in order to address strategic possibility to design DNA-sensors based on immobilized DNA-enzymes. However, the immobilization of biologically active proteins on a gold carrier technique with the ability to detect viral or bacterial nucleic acids is individual for each DNA-modifying enzyme group, due to a different number of active sites, C and N terminal locations and arrangement, therefore, individual protocols based on the 'masking' of active sites should be elaborated for each enzyme.