Abstract
Nucleic acid amplification test is a reliable method for primary human immunodeficiency virus (HIV) infection diagnosis. Herein, a novel fluorescent method for sequence-specific recognition of DNA fragment of HIV-1 was established based upon nicking-assisted strand displacement amplification (SDA) and triplex DNA. In the presence of target dsDNA, nicking-assisted SDA process generated a lot of ssDNA, which hybridized with molecular beacon to produce signal. The fluorescence intensity was proportional to the concentration of target dsDNA within the range from 5 to 1000 pmol/L, with a detection limit of 1.4 pmol/L. Moreover, it successfully distinguished target dsDNA from the nucleic acid extractive of human blood. Thus this method has the merit of high sensitivity, and it is suitable for sequence-specific recognition of target dsDNA in complex matrices, which made it a potential application in diagnosis of acquired immunodeficiency syndrome (AIDS) in the future.
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