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The development of glomerular inflammation in immunoglobulin A nephropathy (IgAN) has been associated with various cytokines, including tumour necrosis factor alpha (TNFalpha). A biallelic polymorphism in the promoter region of the TNFalpha gene (TNFA), at position -308, has been described (TNFA-1 and TNFA-2) and is associated with increased TNFalpha production for the TNFA-2 allele. Another microsatellite polymorphism has been described for TNFd, which is functional and associated with increased production of TNFalpha for the d3 allele.

Polymorphisms of the tumour necrosis factor gene at position -308 and TNFd microsatellite in primary IgA nephropathy