Abstract
An immunoglobulin polypeptide chain is encoded by multiple gene segments that lie far apart in germ-line DNA and must be brought together to allow expression of an immunoglobulin gene active in B lymphocytes. For the immunoglobulin heavy chain genes, one of many variable (V) region genes becomes joined to one of several diversity (D) segments which are fused to one of several joining (J) segments lying 5′ of the constant region (C) genes1,2. Here we show that the rearranged μ genes of an IgM-producing human B-lymphocyte cell line exhibit pancreatic deoxyribonuclease (DNase I) hypersensitive sites in the JH–Cμ intron that are absent in naked DNA or the chromatin of other differentiated cell types. DNA sequence analysis reveals that the major hypersensitive site maps to a conserved region of the JH–Cμ intron recently shown to function as a tissue-specific enhancer of heavy-chain gene expression3,4. A similar association of an enhancer-like element with a DNase I hypersensitive site has been reported for the mouse immunoglobulin light-chain Jκ–Cκ intron5–10. These results implicate disruption of local chromatin structure in the mechanism of immunoglobulin enhancer function.
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Mills, F., Fisher, L., Kuroda, R. et al. DNase I hypersensitive sites in the chromatin of human μ immunoglobulin heavy-chain genes. Nature 306, 809–812 (1983). https://doi.org/10.1038/306809a0
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DOI: https://doi.org/10.1038/306809a0
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