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Targeted chromatin profiling reveals novel enhancers in Ig H and Ig L chain Loci.

J. Immunol.2014 Feb 1;192(3):1064-70. Epub 2013 Dec 18
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摘要


The assembly and expression of mouse Ag receptor genes are controlled by a collection of cis-acting regulatory elements, including transcriptional promoters and enhancers. Although many powerful enhancers have been identified for Ig (Ig) and TCR (Tcr) loci, it remained unclear whether additional regulatory elements remain undiscovered. In this study, we use chromatin profiling of pro-B cells to define 38 epigenetic states in mouse Ag receptor loci, each of which reflects a distinct regulatory potential. One of these chromatin states corresponds to known transcriptional enhancers and identifies a new set of candidate elements in all three Ig loci. Four of the candidates were subjected to functional assays, and all four exhibit enhancer activity in B but not in T lineage cells. The new regulatory elements identified by focused chromatin profiling most likely have important functions in the creation, refinement, and expression of Ig repertoires.

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