Follow-up study identifies two novel susceptibility loci PRKCB and 8p11.21 for systemic lupus erythematosus

Rheumatology (Oxford). 2011 Apr;50(4):682-8. doi: 10.1093/rheumatology/keq313. Epub 2010 Dec 6.


Objective: We have performed a large-scale replication study based on our previous genome-wide association study (GWAS) of SLE in the Chinese Han population to further explore additional genetic variants affecting susceptibility to SLE.

Methods: Thirty-eight single nucleotide polymorphisms from our GWAS were genotyped in two additional Chinese Han cohorts (total 3152 cases and 7050 controls) using the Sequenom Massarray system. Association analyses were performed using logistic regression with gender or sample cohorts as a covariate.

Results: Association evidence for rs16972959 (PRKCB at 16p11.2) and rs12676482 (8p11.21) with SLE was replicated independently in both replication cohorts (P < 0.05), showing high significance for SLE in combined all 4199 cases and 8255 controls of Chinese Han [rs16972959: odds ratio (OR) = 0.81; 95% CI 0.76, 0.87; P(combined) = 1.35 × 10(-9); rs12676482: OR = 1.26; 95% CI 1.15, 1.38; P(combined) = 6.68 × 10(-7)). PRKCB is related to the established SLE immune-related pathway (NF-κB) and 8p11.21 contains important candidate genes such as IKBKB and DKK4. IKBKB is a critical component of NF-κB and DKK4 is an inhibitor of canonical Wnt signalling pathway. Interestingly, PRKCB is required for recruiting IKBKB into lipid rafts, up-regulating NF-κB-dependent survival signal.

Conclusions: Our findings provided novel insights into the genetic architecture of SLE and emphasized the contribution of multiple variants of modest effect. Further study focused on PRKCB, 8p11.21, should advance our understanding on the pathogenesis of SLE.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Asian People / ethnology
  • Asian People / genetics*
  • Case-Control Studies
  • China
  • Chromosomes, Human, Pair 8 / genetics*
  • Female
  • Follow-Up Studies
  • Genetic Predisposition to Disease / ethnology
  • Genetic Predisposition to Disease / genetics*
  • Genome-Wide Association Study*
  • Genotype
  • Humans
  • I-kappa B Kinase / genetics
  • I-kappa B Kinase / physiology
  • Intercellular Signaling Peptides and Proteins / genetics
  • Intercellular Signaling Peptides and Proteins / physiology
  • Lupus Erythematosus, Systemic / ethnology
  • Lupus Erythematosus, Systemic / genetics*
  • Male
  • Middle Aged
  • NF-kappa B / physiology
  • Polymorphism, Single Nucleotide / genetics*
  • Protein Kinase C / genetics*
  • Protein Kinase C beta
  • Signal Transduction / genetics
  • Wnt Proteins / physiology


  • DKK4 protein, human
  • Intercellular Signaling Peptides and Proteins
  • NF-kappa B
  • Wnt Proteins
  • I-kappa B Kinase
  • IKBKB protein, human
  • Protein Kinase C
  • Protein Kinase C beta