DNA (Deoxyribose Nucleic Acid) aptamer for detecting grouper iridovirus infection, as well as screening method and application of DNA aptamer

Abstract

The invention discloses a DNA (Deoxyribose Nucleic Acid) aptamer for detecting grouper iridovirus infection, as well as a screening method and an application of the DNA aptamer. Two inverse screening steps are introduced in each screening process; first, a single-stranded DNA library of the former screening process is bound with normal cells to remove nonspecific ssDNA (single-stranded DNA) bound with the normal cells of a grouper; then, supernatant is bound with grouper iridovirus infected cells for screening; and ssDNA separated from the grouper iridovirus infected cells is bound with the normal cells for separation to obtain the supernatant. A PCR (Polymerase Chain Reaction) amplification library prepares the single-stranded DNA library. The above screening flow is repeated; compared with the number of the normal cells in the first screening process, the number of the normal cells in the screening process is increased by 2-6 times; compared with binding time of the library and the cells in the first screening process, the binding time of the library and the cells in the subsequent screening process is increased to 1h from 0.5h; and the binding time of the library and the virus infected cells is shortened to 0.5h from 1h to improve the screening efficiency of each process.

Description

Technical field:

[0001] The invention belongs to the field of molecular biology, and in particular relates to a DNA nucleic acid aptamer which can be used for detection of grouper iridescent virus (SGIV) infection at the cell level and tissue level, and a screening method and application thereof. Background technique:

[0002] Nucleic acid aptamer is a new type of detection and treatment tool screened by exponential enrichment ligand system evolution (SELEX). Ligand system evolution technology with exponential enrichment is a kind of biological library technology for novel detection and treatment that has attracted wide attention. It uses artificially synthesized, capacity of about 10 14 ~10 15 The random oligonucleotide library is combined with the target substance, and the nucleic acid aptamer of the target substance is obtained after multiple rounds of screening. The nucleic acid aptamers screened by this technology have high specificity and high affinity comparable to...

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