We have tested the ability of the T cell receptor beta (TCR-beta) transcriptional enhancer (E beta) to confer transcriptional activation and tissue-specific V(D)J recombination of TCR-beta V, D, and J segments in a transgenic minilocus recombination substrate. We find that the minimal E beta element, as previously shown for a DNA segment that contained the E mu element, promotes a high level of substrate D to J beta rearrangement in both B and T cells, but only promotes V beta to DJ beta rearrangement in T cells. Thus, both the E mu and E beta elements similarly direct V(D)J recombination of this substrate in vivo, supporting a general role for transcriptional enhancers in the normal regulation of this rearrangement process. Surprisingly, however, we found that both the V beta and DJ beta portion of the constructs were transcribed in an enhancer-dependent fashion (conferred by either E mu or E beta) in both B and T lineage cells, including normal precursor B cells propagated in culture. These findings indicate that, at least in some contexts, transcriptional activation, per se, is not sufficient to confer V(D)J recombinational accessibility to a substrate V gene segment.
Differential activation of transcription versus recombination of transgenic T cell receptor beta variable region gene segments in B and T lineage cells.
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A Okada, M Mendelsohn, F Alt; Differential activation of transcription versus recombination of transgenic T cell receptor beta variable region gene segments in B and T lineage cells.. J Exp Med 1 July 1994; 180 (1): 261–272. doi: https://doi.org/10.1084/jem.180.1.261
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