Detection of SARS-CoV-2 RNA Using a DNA Aptamer Mimic of Green Fluorescent Protein.

Detection of SARS-CoV-2 RNA Using a DNA Aptamer Mimic of Green Fluorescent Protein.
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DOI:
10.1021/acschembio.1c00893
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发表时间:
2022-04-15
影响因子:
4
通讯作者:
Jaffrey, Samie R.
Jaffrey, Samie R.
中科院分区:
生物学2区
文献类型:
--
作者:
VarnBuhler, Bria S.;Moon, Jared;Dey, Sourav Kumar;Wu, Jiahui;Jaffrey, Samie R.

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RNA detection is important in diverse diagnostic and analytical applications. RNAs can be rapidly detected using molecular beacons, which fluoresce upon hybridizing to a target RNA but require oligonucleotides with complex fluorescent dye and quencher conjugations. Here we describe a simplified method for rapid fluorescence detection of a target RNA using simple unmodified DNA oligonucleotides. To detect RNA, we developed Lettuce, a fluorogenic DNA aptamer that binds and activates the fluorescence of DFHBI-1T, an otherwise nonfluorescent molecule that resembles the chromophore found in green fluorescent protein (GFP). Lettuce was selected from a randomized DNA library based on binding to DFHBI-agarose. We further show that Lettuce can be split into two separate oligonucleotide components, which are nonfluorescent on their own but become fluorescent when their proximity is induced by a target RNA. We designed several pairs of split Lettuce fragments that contain an additional 15–20 nucleotides that are complementary to adjacent regions of the SARS-CoV-2 RNA, resulting in Lettuce fluorescence only in the presence of the viral RNA. Overall, these studies describe a simplified RNA detection approach using fully unmodified DNA oligonucleotides that reconstitute the Lettuce aptamer templated by RNA.
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