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Is there a future for TNF promoter polymorphisms?

J-P Bayley1, T H M Ottenhoff, C L Verweij

  • 1Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands. j.p.bayley@lumc.nl

Genes and Immunity
|February 20, 2004
PubMed
Summary

Tumor necrosis factor (TNF) promoter polymorphisms show mixed results in disease association studies. Recent functional studies suggest some TNF SNPs may not be functional, with others remaining controversial.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Disease Association Studies

Background:

  • Numerous case-control studies investigate tumor necrosis factor (TNF) promoter polymorphisms (SNPs) in relation to various human diseases.
  • Several studies claim functional roles for these SNPs, driving research into TNF's involvement in disease pathogenesis.

Purpose of the Study:

  • To review case-control studies on TNF polymorphisms in autoimmune, inflammatory, and infectious diseases.
  • To evaluate the evidence for the functional role of various TNF promoter polymorphisms.

Main Methods:

  • Review of published case-control association studies focusing on rheumatoid arthritis, multiple sclerosis, ankylosing spondylitis, asthma, malaria, hepatitis B/C, leprosy, and sepsis.
  • Analysis of in vitro and functional studies examining the impact of TNF promoter polymorphisms.

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Main Results:

  • Case-control studies yielded mixed results, with limited consensus on TNF SNP association with most diseases, except for infectious diseases like malaria.
  • Functional studies also produced inconsistent findings; the -308G/A polymorphism appears non-functional, while others remain debated.
  • Studies increasingly utilize extended haplotypes to analyze variations within the MHC region.

Conclusions:

  • The association between TNF promoter polymorphisms and disease susceptibility is largely inconclusive based on current case-control data.
  • The functional significance of most TNF promoter polymorphisms, including the widely studied -308G/A SNP, remains uncertain or controversial.
  • Advanced methods like extended haplotype analysis are becoming crucial for understanding TNF region variation in disease contexts.