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The Journal of Immunology, Vol 150, Issue 9 3895-3904, Copyright © 1993 by American Association of Immunologists

ARTICLES

Isolation and characterization of a novel B cell activation gene

JX Hong, GL Wilson, CH Fox and JH Kehrl
Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.

Using subtractive cDNA cloning, we have isolated a series of cDNA clones that are differentially expressed between B and T lymphocytes. Whereas some of the isolated cDNA are from known B cell-specific genes, many of them represent previously uncharacterized genes. One of these unknown genes was denoted as BL34. Northern blot analysis performed with the BL34 cDNA revealed a 1.6-kb mRNA transcript that was present at low levels in RNA extracted from resting B lymphocytes, but whose expression was markedly increased in RNA prepared from mitogen- activated B cells. Similarly, RNA prepared from several B cell lines treated with phorbol myristate acetate (PMA) contained high levels of BL34 mRNA. In contrast, RNA from purified T cells treated with phytohemagglutinin and PMA had undetectable amounts of BL34 mRNA. In addition, high levels of BL34 mRNA were detected in RNA purified from PBMC of a patient with B cell acute lymphocytic leukemia. Southern blot analysis of human DNA from various tissues and cells lines demonstrated that BL34 is a single-copy gene without evidence of rearrangement. Two full length BL34 cDNA were sequenced, and an open reading frame of 588 bp was identified that was predicted to encode for a 196 amino acid protein. Searches of several protein data bases failed to find any homologous proteins. To directly analyze the expression of BL34 mRNA in lymphoid tissues in situ, hybridization studies with human tonsil tissue sections were performed. BL34 mRNA was detected in a portion of the cells in the germinal center region and adjacent to the mantle region. Further characterization of the BL34 gene and its protein should lead to insights to its role in B cell function and the consequences of its over-expression in acute lymphocytic leukemia.


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