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Association of IL-1 gene complex members with ankylosing spondylitis in Chinese Han population

Z S Guo1, C Li, Z M Lin

  • 1Department of Rheumatology, Third affiliated Hospital of Sun Yat-sen University, Guangzhou, China.

International Journal of Immunogenetics
|November 26, 2009
PubMed

Insights

Genetic variations in the IL-1 gene cluster are linked to ankylosing spondylitis (AS) in the Chinese Han population. Specific polymorphisms and haplotypes show significant associations with AS risk and clinical features.

Area of Science:

  • Immunogenetics
  • Rheumatology
  • Human Genetics

Background:

  • Ankylosing spondylitis (AS) is a chronic inflammatory disease with reported associations to IL-1 complex gene polymorphisms, but findings vary across populations.
  • Few studies have explored the link between IL-1 gene variations and the clinical manifestations of AS.

Purpose of the Study:

  • To investigate the association between IL-1 gene cluster polymorphisms and AS in the Chinese Han population.
  • To examine the relationship between these genetic variations and the clinical symptoms of AS patients.

Main Methods:

  • Genotyping of five single nucleotide polymorphisms (SNPs) and one IL1RN variable number tandem repeat (VNTR) in the IL-1 gene cluster.
  • Comparison of allele, genotype, and haplotype frequencies between AS patients and healthy controls using SHEsis software.
  • Analysis of linkage disequilibrium and haplotype associations with AS.

Main Results:

  • The allele C of the IL1F10.3 marker was significantly more frequent in AS patients (p = 0.001, OR = 1.54).
  • Strong linkage disequilibrium was observed between IL1B-511, IL1B+3953, and RN4.
  • Specific haplotypes, including IL1B-511-T/IL1B+3953-C/IL1F10.3-C/RN4-T/IL1RN.VNTR-1/IL1RN6.1-C, showed a strong association with AS (p = 3.32 x 10(-5), OR = 4.41).
  • A weak association was found between the IL1RN.VNTR A2 allele and peripheral arthritis risk (OR = 0.2).

Conclusions:

  • The IL-1 gene cluster is significantly associated with ankylosing spondylitis in the Chinese population.
  • These findings support previous research and highlight potential genetic factors influencing AS clinical presentation.
  • Further research may elucidate the specific roles of these genetic variants in AS pathogenesis and clinical outcomes.

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