Levels of polyadenylation factor CstF-64 control IgM heavy chain mRNA accumulation and other events associated with B cell differentiation - PubMed (original) (raw)

Levels of polyadenylation factor CstF-64 control IgM heavy chain mRNA accumulation and other events associated with B cell differentiation

Y Takagaki et al. Mol Cell. 1998 Dec.

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Abstract

Cleavage stimulation factor (CstF) is one of the multiple factors required for mRNA polyadenylation. The concentration of one CstF subunit (CstF-64) increases during activation of B cells, and this is sufficient to switch IgM heavy chain mRNA expression from membrane-bound form to secreted form. To extend this observation, we disrupted the endogenous CstF-64 gene in the B cell line DT40 and replaced it with a regulatable transgene. Strikingly, a 10-fold decrease in CstF-64 concentration did not markedly affect cell growth but specifically and dramatically reduced accumulation of IgM heavy chain mRNA. Further reduction caused reversible cell cycle arrest in G0/G1 phase, while depletion resulted in apoptotic cell death. Our results indicate that CstF-64 plays unexpected roles in regulating gene expression and cell growth in B cells.

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