Detection of Anti- Antibodies in Human Sera Using Synthetic Glycosylphosphatidylinositol Glycans on a Bead-Based Multiplex Assay

Overview

Journal Anal Chem

Specialty Chemistry

Date 2019 Aug 13

PMID 31401830

Citations 6

Authors

Monika Garg

Daniel Stern

Uwe Gross

Peter H Seeberger

Frank Seeber

Daniel Varon Silva

Affiliations

Soon will be listed here.

Abstract

Toxoplasmosis, while often an asymptomatic parasitic disease in healthy individuals, can cause severe complications in immunocompromised persons and during pregnancy. The most common method to diagnose infections is the serological determination of antibodies directed against parasite protein antigens. Here we report the use of a bead-based multiplex assay containing a synthetic phosphoglycan portion of the glycosylphosphatidylinositol (GPI) for the detection of GPI-specific antibodies in human sera. The glycan was conjugated to beads at the lipid site to retain its natural orientation and its immunogenic groups. We compared the response against GPI with that against the protein antigen SAG1, a common component of commercial serological assays, via the detection of parasite-specific human IgG and IgM antibodies, respectively. The GPI-based test is in excellent agreement with the results for the commercial ELISA, as the ROC analysis of the GPI test shows 97% specificity and 98% sensitivity for the assay. GPI was a more reliable predictor for a parasite-specific IgM response compared to SAG1, indicating that a bead-based multiplex assay using GPI in combination with SAG1 may strengthen serology, in particular in seroepidemiological studies.

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