ArticleFrontiers in molecular neuroscience2026
Polyclonal glycine receptor aAbs: a challenge for personalized epitope characterization.
Article in Frontiers in molecular neuroscience, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Patients with glycine receptor (GlyR) aAbs suffer from various diseases, including stiff-person syndrome (SPS), and currently, no cure exists. Several treatment options exist; however, these treatment options lack specificity. To date, only one common epitope has been mapped for GlyR aAbs in the far N-terminal region of the GlyRα1 subunit. However, some patient sera also bind GlyRα2, GlyRα3, or GlyRβ. Therefore, more than one common epitope may exist. Unraveling these epitopes will help generate more specific treatment approaches. Methods: Here, we constructed GlyRa1 and GlyRa3 variants by site-directed mutagenesis using amino acid differences between these two subunits within their extracellular domains. Peptide microarrays, which have shown that an epitope including the binding site of a commercial pan-a antibody ( Results: The GlyRa1 and GlyRa3 variants helped to identify which amino acid sequences in the extracellular domain of GlyRs represent additional aAb epitopes or are involved in aAb binding. Using both generated peptides for aAb neutralization with a patient serum containing GlyRb aAbs that bind specifically to this region Discussion: In conclusion, our data demonstrate that GlyR aAbs are polyclonal or bind to structural epitopes. These results define single residues important for aAb binding and help explain why no further common aAb binding site has been identified so far. Hence, patient-specific pattern for GlyR aAbs exist, emphasizing the importance of epitope characterization as basis for future therapeutic testing or even complete neutralization of the aAbs.
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