Nucleic acid detection method based on DNA (Deoxyribonucleic Acid) hairpin and RCA (Rolling Circle Amplification)

Abstract

The invention provides a nucleic acid detection method based on a DNA (Deoxyribonucleic Acid) hairpin and RCA (Rolling Circle Amplification). The detection method comprises the steps of: modifying the DNA hairpin to a solid carrier, wherein the circular part of the DNA hairpin is complementary with a target DNA and the stem part of the DNA hairpin is complementary with an an annular DNA; adding the annular DNA, an enzyme, an amplification raw material and the like; complementing and pairing a target nucleic acid molecule and the loop of the DNA hairpin when the target nucleic acid molecule is added into a detection system; opening a hairpin-loop structure; hybridizing a base of the hairpin and the circular DNA; performing RCA; opening different hairpin-loop structures when the target nucleic acid molecular weights are different; and quantifying the target nucleic acid molecule by using an optical or electric method. According to the nucleic acid detection method, as the DNA hairpin is used as a detection probe of RCA, the step of detecting the molecule by RCA is simplified, the detection cost is reduced, the advantage of high sensitivity of RCA for nucleic acid detection is simultaneously kept, and the nucleic acid detection method is suitable for popularization and use.

Description

technical field [0001] The invention belongs to the field of biomolecular detection, and in particular relates to a method for realizing rapid and highly sensitive detection of nucleic acid molecules based on DNA hairpin and rolling circle amplification (RCA). Background technique [0002] Rolling circle amplification (RCA) is a newly developed isothermal nucleic acid amplification method. Using circular DNA as a template, dNTPs are converted into single-stranded DNA under the catalysis of a special DNA polymerase (phi 29 DNA polymerase) through a short DNA primer (complementary to a part of the circular template). Its linear amplification factor is 10 5 , the exponential amplification ability is greater than 10 9 , realize the signal amplification of the target nucleic acid, and the sensitivity reaches one copy of the nucleic acid molecule, which has great application value and potential in nucleic acid detection. For example, Juan Hu et al. (Juan Hu, Chun-yang Zhang; Se...

AI Technical Summary

Problems solved by technology

However, the modification of fluorescent molecules and fluorescence quenching molecules is expensive, and the cost of molecular detection is too high, which is not conducive to the popularization and use of detection methods.

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