Systemic lupus erythematosus (SLE) is a clinically and genetically heterogeneous disease. A recent genome-wide association study, which included 7,219 patients, identified 43 susceptibility loci for SLE, including 10 new associations. As transcription factors were over-represented among the SLE susceptibility genes, the researchers state that their data supports the hypothesis that aberrantly regulated gene expression networks in innate and adaptive immune cells contribute to the risk of developing this disease.