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Abstract 


The expression of MHC class II genes is tightly regulated. One form of congenital severe combined immunodeficiency (SCID) is characterized by a regulatory defect that precludes expression of HLA class II genes. B lymphocyte cell lines from such SCID patients provide a tool for identifying putative regulatory proteins that bind to class II gene promoters. We have identified three proteins binding to specific segments of the HLA-DRA promoter, two of which interact to form the predominant DNA-protein complex observed. One of these proteins, defined as an X box binding protein (RF-X), is specifically missing in cells from class II deficient SCID patients. We propose that the molecular defect in this congenital HLA class II regulatory deficiency is a lack of RF-X and that this factor plays an important role in the normal regulation of MHC class II gene expression.

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