Conclusion
Our studies to date have implicated several separate DNA elements in Aα gene transcription in B cells: the conserved X-Y region and two related elements further upstream than the X-Y region. Important transcription elements for monocyte/macrophage lineage cells have tended to map much closer to the conserved region than those of B cells [45, 46]; however, we have not yet rigorously tested the control of Aα sequences in macrophages. We conclude from our data on the X box that each murine X box is bound by a different set of proteins, though the major complex generated with an Eα probe may have reflected binding by the same protein as the main Eβ complex [47]. Cloned cDNAs encoding Aα X box-X-Y interspace binding proteins [48] will further the analysis of transcription biochemistry for Aα. We also conclude that DNA sequences upstream from Aα are important in B-cell-specific cis-activation of transcription, that this function will at least in part be mediated by a DNA-binding protein that binds to two sites upstream from X and Y in Aα and that these sites will be essential for IL-4-induced increases in transcription. Tests of these observations will hopefully lead to a greater degree of understanding of the control of class II transcription, as well as of its failure in class II-deficient bare lymphocyte syndrome SCID patients.
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Boothby, M., Liou, HC., Finn, P.W. et al. Control of transcription at the murine Aα locus. Immunol Res 9, 77–92 (1990). https://doi.org/10.1007/BF02918199
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DOI: https://doi.org/10.1007/BF02918199