Granzyme B gene polymorphism associated with subacute sclerosing panencephalitis

Area of Science:

• Genetics
• Immunology
• Neurology

Background:

• Subacute sclerosing panencephalitis (SSPE) is a rare, fatal neurological complication following measles infection.
• Genetic factors and immune dysfunction are implicated in SSPE pathogenesis.
• A specific granzyme B gene (GZMB) single nucleotide polymorphism (SNP) is investigated for its potential role in SSPE susceptibility.

Purpose of the Study:

• To investigate the association between GZMB SNP (rs8192917) and susceptibility to SSPE.
• To compare the frequencies of the SNP and its genotypes in SSPE patients and healthy controls.
• To assess the in vitro GZMB production in relation to different genotypes.

Main Methods:

• Polymerase chain reaction-restriction fragment length polymorphism was used to screen the GZMB SNP (rs8192917) in 118 SSPE patients and 221 healthy controls.
• Allele and genotype frequencies were compared between the SSPE and control groups.
• In vitro GZMB production was measured in healthy controls with varying genotypes.

Main Results:

• The G allele frequency was lower in SSPE patients (0.22) compared to healthy controls (0.31).
• The GG genotype was significantly less frequent in SSPE patients (odds ratio = 0.23).
• Individuals carrying the G allele demonstrated higher in vitro GZMB production upon stimulation.

Conclusions:

• The findings suggest that the GZMB rs8192917 polymorphism may influence susceptibility to SSPE.
• Carriers of the G allele, associated with higher GZMB production, appear to have reduced risk, potentially indicating a protective effect.
• Larger population studies are needed to confirm these genetic associations in SSPE.