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Genetic variability in the TNF-alpha promoter is not associated with type II diabetes mellitus (NIDDM).
Recent evidence suggests that expression of tumor necrosis factor-alpha (TNF-alpha) by adipocytes is a molecular mediator of insulin resistance in obesity. We have therefore tested the hypothesis that variations within the regulatory region of the TNF-alpha gene, which might cause increased adipocyte or generalized TNF-alpha synthesis, are associated with NIDDM, a state in which insulin resistance is routinely observed. Neither the previously known variants within the TNF-alpha promoter at position -308 and -238, nor two newly identified polymorphisms at position -376 and -163, were found at a significantly higher frequency in Caucasian NIDDM patients compared to non-diabetic controls. No genetic variants were found in Pima Indians. These data make it unlikely that mutations within regulatory elements of the TNF-alpha gene are associated with an increase in the prevalence of NIDDM.
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