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Title: Competitive ELISA for a serologic test to detect dengue serotype-specific anti-NS1 IgGs using high-affinity UB-DNA aptamers
Authors: Matsunaga, Ken-ichiro
Kimoto, Michiko
Lim, Vanessa Weixun
Thein, Tun-Linn
Vasoo, Shawn
Leo, Yee-Sin 
Sun, William 
Hirao, Ichiro
Issue Date: 9-Sep-2021
Publisher: Nature Research
Citation: Matsunaga, Ken-ichiro, Kimoto, Michiko, Lim, Vanessa Weixun, Thein, Tun-Linn, Vasoo, Shawn, Leo, Yee-Sin, Sun, William, Hirao, Ichiro (2021-09-09). Competitive ELISA for a serologic test to detect dengue serotype-specific anti-NS1 IgGs using high-affinity UB-DNA aptamers. Scientific Reports 11 (1) : 18000. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Serologic tests to detect specific IgGs to antigens related to viral infections are urgently needed for diagnostics and therapeutics. We present a diagnostic method for serotype-specific IgG identification of dengue infection by a competitive enzyme-linked immunosorbent assay (ELISA), using high-affinity unnatural-base-containing DNA (UB-DNA) aptamers that recognize the four categorized serotypes. Using UB-DNA aptamers specific to each serotype of dengue NS1 proteins (DEN-NS1), we developed our aptamer–antibody sandwich ELISA for dengue diagnostics. Furthermore, IgGs highly specific to DEN-NS1 inhibited the serotype-specific NS1 detection, inspiring us to develop the competitive ELISA format for dengue serotype-specific IgG detection. Blood samples from Singaporean patients with primary or secondary dengue infections confirmed the highly specific IgG detection of this format, and the IgG production initially reflected the serotype of the past infection, rather than the recent infection. Using this dengue competitive ELISA format, cross-reactivity tests of 21 plasma samples from Singaporean Zika virus-infected patients revealed two distinct patterns: 8 lacked cross-reactivity, and 13 were positive with unique dengue serotype specificities, indicating previous dengue infection. This antigen-detection ELISA and antibody-detection competitive ELISA combination using the UB-DNA aptamers identifies both past and current viral infections and will facilitate specific medical care and vaccine development for infectious diseases. © 2021, The Author(s).
Source Title: Scientific Reports
ISSN: 2045-2322
DOI: 10.1038/s41598-021-97339-8
Rights: Attribution 4.0 International
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