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. 1990 Jun 25;18(12):3565–3571. doi: 10.1093/nar/18.12.3565

Lymphoid-specific transcriptional activation by components of the IgH enhancer: studies on the E2/E3 and octanucleotide elements.

G P Cook 1, M S Neuberger 1
PMCID: PMC331011  PMID: 2114013

Abstract

The IgH enhancer is a strong lymphoid-specific activator and is composed of multiple factor-binding motifs. One of these, the octamer, is common to enhancer and promoter, binds ubiquitous and lymphoid-specific factors and is able to act as a lymphoid-specific transcriptional activator. However, it is also found as an essential component of promoters active in non-lymphoid cells. From analysis of the activities of synthetic promoters, we suggest that recruitment of the lymphoid-specific octamer-binding protein next to the TATA is sufficient to create a functional lymphoid-specific promoter whereas the ubiquitous octamer binding protein is not active in single copy but can act in concert with other promoter binding factors. However, the activity of the IgH enhancer is not dependent on the octamer and we identify the E2/E3 elements as also being sufficient to confer lymphoid-specificity on a linked gene. Activity of the E2/E3 region results from the synergistic activity of the two motifs, E2 alone being able to confer a low level of activity which is dramatically increased by the adjacent E3. Thus, in the case of both the E2/E3 and the octamer motifs, interactions between adjacent elements can play a critical role in determining the tissue specificity of activity.

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