The transcription factor STAT5 binds to distinct super-enhancer sites and controls Lrrc32 expression in a prominent autoimmune and allergic disease risk locus
Hennighausen, L.; Lee, H. K.
Show abstract
Genetic variants associated with diseases are enriched in genomic sequences linked to regulatory regions, such as enhancers, super-enhancers and possibly repressors, that control nearby and distant genes. A known allergic and autoimmune risk locus at chromosome 11q13.51,2 is associated with the LRRC32 gene, which encodes GARP, a protein critical for TGF-{beta} delivery3. This region coincides with a candidate enhancer that was predicted by the presence of activating chromatin marks and contains a polymorphism significantly associated with GARP expression on CD4+CD127-CD25+ Treg cells4. In the mouse, binding of the cytokine-induced transcription factor STAT5 was detected at two sites within the expansive candidate enhancer region and a 2.3 kb deletion resulted in reduced Lrrc32 expression4. However, a clear definition of the enhancer units controlled by STAT5 and a functional understanding of STAT5 in the regulation of Lrrc32 are needed. Here we use high-resolution ChIP-seq and identify three STAT5 binding sites within the Lrrc32 super-enhancer, one shared between Treg cells and mammary epithelium and one specific to each respective cell type. Using mice that express only 10% of normal STAT5 levels we demonstrate the defining contribution of STAT5 in the activation of the Lrrc32 super-enhancer.
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