Replicated associations of TNFAIP3, TNIP1 and ETS1 with systemic lupus erythematosus in a southwestern Chinese population

Arthritis Res Ther. 2011;13(6):R186. doi: 10.1186/ar3514. Epub 2011 Nov 16.

Abstract

Introduction: Recent genome-wide and candidate gene association studies in large numbers of systemic lupus erythematosus (SLE) patients have suggested approximately 30 susceptibility genes. These genes are involved in three types of biological processes, including immune complex processing, toll-like receptor function and type I interferon production, and immune signal transduction in lymphocytes, and they may contribute to the pathogenesis of SLE. To better understand the genetic risk factors of SLE, we investigated the associations of seven SLE susceptibility genes in a Chinese population, including FCGR3A, FCGR2A, TNFAIP3, TLR9, TREX1, ETS1 and TNIP1.

Methods: A total of 20 SNPs spanning the seven SLE susceptibility genes were genotyped in a sample of 564 unrelated SLE patients and 504 unrelated healthy controls recruited from Yunnan, southwestern China. The associations of SNPs with SLE were assessed by statistical analysis.

Results: Five SNPs in two genes (TNFAIP3 and ETS1) were significantly associated with SLE (corrected P values ranging from 0.03 to 5.5 × 10(-7)). Through stratified analysis, TNFAIP3 and ETS1 showed significant associations with multiple SLE subphenotypes (such as malar rash, arthritis, hematologic disorder and antinuclear antibody) while TNIP1 just showed relatively weak association with onset age. The associations of the SNPs in the other four genes were not replicated.

Conclusions: The replication analysis indicates that TNFAIP3, ETS1 and TNIP1 are probably common susceptibility genes for SLE in Chinese populations, and they may contribute to the pathogenesis of multiple SLE subphenotypes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Asian Continental Ancestry Group / genetics
  • China
  • DNA-Binding Proteins / genetics*
  • Female
  • Gene Frequency
  • Genetic Predisposition to Disease
  • Genotype
  • Humans
  • Intracellular Signaling Peptides and Proteins / genetics*
  • Linkage Disequilibrium
  • Lupus Erythematosus, Systemic / ethnology
  • Lupus Erythematosus, Systemic / genetics*
  • Lupus Erythematosus, Systemic / pathology
  • Male
  • Middle Aged
  • Nuclear Proteins / genetics*
  • Phenotype
  • Polymorphism, Single Nucleotide
  • Proto-Oncogene Protein c-ets-1 / genetics*
  • Tumor Necrosis Factor alpha-Induced Protein 3
  • Young Adult

Substances

  • DNA-Binding Proteins
  • ETS1 protein, human
  • Intracellular Signaling Peptides and Proteins
  • Nuclear Proteins
  • Proto-Oncogene Protein c-ets-1
  • TNIP1 protein, human
  • TNFAIP3 protein, human
  • Tumor Necrosis Factor alpha-Induced Protein 3