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Gephyrin Neurological Autoimmunity.

Maria Chiara Pantuliano1,2,3, Friederike A Arlt1, Naomi Arenson4

  • 1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN.

Annals of Neurology
|June 17, 2026
PubMed
Summary
This summary is machine-generated.

Gephyrin-immunoglobulin G (IgG) autoantibodies are linked to treatable autoimmune neurological disorders, including encephalitis and myeloneuropathy. This discovery expands understanding of synaptic antibody-associated diseases and their paraneoplastic origins.

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Area of Science:

  • Neuroimmunology
  • Synaptic protein research
  • Autoimmune neurology

Background:

  • Gephyrin is a crucial postsynaptic scaffold protein for inhibitory neurotransmission.
  • Gephyrin-immunoglobulin G (IgG) was previously reported in a single paraneoplastic stiff-person-like syndrome case.
  • The broader clinical significance of gephyrin-IgG remained largely unknown.

Purpose of the Study:

  • To investigate the clinical relevance of gephyrin-IgG in patients with unclassified synaptic IgG.
  • To identify potential neurological diseases associated with gephyrin-IgG.

Main Methods:

  • Human protein microarray was used to screen for gephyrin-IgG.
  • Gephyrin specificity was confirmed through confocal tissue-based immunofluorescence, cell-based assays, and Western blot.

Main Results:

  • Gephyrin-IgG was identified in three female patients presenting with neurological symptoms.
  • Clinical manifestations included encephalitis (two patients) and myeloneuropathy with breast cancer (one patient).
  • All patients exhibited inflammatory cerebrospinal fluid, abnormal MRI findings, and showed improvement with immunotherapy.

Conclusions:

  • Gephyrin-IgG is associated with treatable autoimmune neurological diseases, which can be paraneoplastic.
  • This finding highlights gephyrin-IgG as a relevant biomarker for specific autoimmune neurological conditions.