Large-Scale Meta-Analysis of TNF-α rs1800629 Polymorphism in Schizophrenia: Evidence from 7,624 Cases and 8,933...

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Schizophrenia affects 1% of the global population, influenced by genetic, environmental, and neurodevelopmental factors.
• Neuroinflammation and immune system disturbances are increasingly implicated in schizophrenia pathogenesis.
• Tumor necrosis factor-alpha (TNF-α) is a key cytokine in inflammatory processes relevant to psychiatric disorders.

Purpose of the Study:

• To investigate the association between the TNF-α rs1800629 genetic variant and schizophrenia risk.
• To synthesize existing evidence through a comprehensive meta-analysis.
• To clarify the role of this specific TNF-α polymorphism in schizophrenia susceptibility.

Main Methods:

• Systematic literature search across major databases (PubMed, Web of Science, Embase, Cochrane, CNKI) up to January 2024.
• Inclusion of 33 case-control studies with 7,624 schizophrenia patients and 8,933 healthy controls.
• Meta-analysis using a fixed-effects model to calculate odds ratios and 95% confidence intervals, with subgroup analyses by ethnicity and country.

Main Results:

• The pooled analysis revealed no significant association between the TNF-α rs1800629 polymorphism and schizophrenia risk across all genetic models.
• Subgroup analyses stratified by ethnicity (Asian, Caucasian), country, genotyping method, and publication year also showed no significant associations.
• The findings were consistent across diverse populations and study designs.

Conclusions:

• The TNF-α rs1800629 variant does not appear to be a significant risk factor for schizophrenia.
• This specific genetic polymorphism is unlikely to play a major role in schizophrenia susceptibility.
• Future research should explore other TNF-α variants, gene-gene interactions, and alternative inflammatory pathways in schizophrenia.