Isolation of coordinately regulated genes that are expressed in discrete stages of B-cell development.

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Abstract
We have utilized substractive hybridization to isolate 16 distinct cDNA sequences representing gene expressed in pre-B-cell lines but not myeloma cell or fibroblast lines. These sequences represent RMA transcripts that vary in abundance in pre-b-cell lines from 0.001% to 0.05%. Five of these sequences were not related to any known genes. One was related to but distinct from known myosin regulatory light chain genes and another encoded a protein with lectin domains. Three represented previously identified genes encoding carbonic anhydrase type II, thymosin, and CD2; these genes were not previously known to be specifically expressed in early stages of B-cell development. Other isolated genes corresponded to pre-B-cell-specific or pre-B-cell/B cell-specific genes recently described by others. The isolated cDNA sequences may be divided into two general categories-those representing gens expressed only in the pre-B-bell stage of B-cell development and those expressed in both the pre-B-cell and B-cell stages. The in vivo expression patterns of the identified genes suggest that some function specifically in lymphocytes while others may have roles in additional lineages.