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Nucleic Acids Research, 1991, Vol. 19, No. 18 5007-5014
© 1991

MOLECULAR BIOLOGY

DNase I hypersensitive site flank the mouse class II major histocompatibility complex during B cell development

Susan Carson

Immunology Division, National Institute for Medical Research The Ridgeway, Mill Hill, London NW7 1AA, UK

Received May 30, 1991. Accepted August 19, 1991.

The mouse class II major histocompatibility complex (MHC) encodes a polymorphic, multigene family important in the immune response, and is expressed mainly on mature B cells, on certain types of dendritic cells and is also inducible by gamma-interferon on antigen presenting cells.To study the regulatory elements which control this expression pattern, we have examined the chromatin structure flanking the class II MHC region, in particular during B cell differentiation. Using a panel of well-characterised mouse cell lines specific for different stages of B cell development (pre-B, B, plasma cell) as well as non-B cell lines, we have mapped the DNase I hypersensitive (DHS) sites adjacent to the mouse MHC class II region. The results presented show, for the first time that there are specific hypersensitive sites flanking the class II MHC locus during pre B cell, B cell and plasma cell stages of B cell differentiation, Irrespective of the status of class II MHC expression. These hypersensitive sites are not found in T cell, fibroblast or uninduced myelomonocytic cell lines.This suggests that these DHS sites define a developmentally stable, chromatin structure, which can be used as a marker of B cell lineage committment and may indicate that a combination of these hypersensitive sites reflect regulatory proteins involved in the immediate expression of a particular class II MHC gene or possibly control of the entire locus.


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