GRIN1 polymorphisms do not affect susceptibility or phenotype in NMDA receptor encephalitis.

Area of Science:

• Neuroimmunology
• Genetics
• Neurology

Background:

• N-methyl-D-aspartate receptor (NMDAR) encephalitis is an autoimmune disorder.
• The genetic factors influencing NMDAR encephalitis susceptibility and clinical presentation remain largely unknown.

Purpose of the Study:

• To investigate the association between single nucleotide polymorphisms (SNPs) in the GRIN1 gene and NMDAR encephalitis.
• To determine if GRIN1 variants correlate with clinical variability in NMDAR encephalitis patients.

Main Methods:

• Sequencing of GRIN1 coding exons in Caucasian-European patients with NMDAR encephalitis.
• Case-control study comparing SNP frequencies with ethnically matched controls.
• Clinical data analysis to correlate genotypes with disease presentation, severity, and course.

Main Results:

• Two GRIN1 SNPs (rs6293 and rs1126442) were identified in linkage disequilibrium.
• The frequency of these SNPs did not differ between NMDAR encephalitis patients and the general population.
• No significant differences in clinical presentation, disease severity, or outcomes were observed based on GRIN1 genotype.

Conclusions:

• GRIN1 SNPs do not appear to strongly influence NMDAR encephalitis susceptibility or disease course.
• This study provides baseline frequency data for GRIN1 SNPs in NMDAR encephalitis.
• Larger, multisite collaborative studies are essential to elucidate the genetic underpinnings of NMDAR encephalitis.