The abstract is read at the publisher; the summary is JClub's.
QML-22, a divergent dengue virus type 2 strain, shows >1000-fold lower neutralization by the potent anti-DENV2 antibody 3F9 than endemic DENV2 strains, despite clustering on an antigenic map with DENV2.
- Why it matters: Spillover outbreaks from non-human primates may involve sylvatic genotypes, but it is unclear whether their phylogenetic divergence corresponds to antigenic differences that affect neutralization.
- What they did: The study antigenically mapped QML-22 and compared neutralization by antisera from DENV1–4 infections, then identified a distinct domain I E-protein residue cluster and tested antibody 3F9 and other antibodies; primate antisera depletion assessed epitope specificity.
- The result: QML-22 was less neutralized by endemic DENV2 antisera and more by DENV1/3/4 antisera, with 3F9 showing >1000-fold reduced neutralization; depletion and evolutionary analyses suggest homologous neutralization depends on distinct epitopes and that the 3F9 site evolved under relaxed selection.
The findingWhy it mattersWhat they didThe result
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