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Journal of Neuroscience, Vol 12, 691-704, Copyright © 1992 by Society for Neuroscience
A neural-specific GAP-43 core promoter located between unusual DNA elements that interact to regulate its activity
E Nedivi, GS Basi, IV Akey and JH Skene
Department of Neurobiology, Stanford University, California 94305.
In an effort to identify cis-acting elements that respond to signals
controlling different stages of neural differentiation, we have analyzed
the promoter and surrounding regulatory sequences of the rat GAP-43 gene.
Expression of this gene is both neural specific and, within neurons,
strongly modulated by signals related to axon integrity. Expression
analysis in cell lines and primary rat cortical cultures demonstrates that
neural-selective gene expression can be directed by a 386 base pair GAP-43
promoter fragment that contains canonical TATA and CCAAT box consensus
sequences. A short region of homology with other neural-specific genes,
identified upstream of the core promoter, is not essential for selective
expression in neuronal cells. Within cortical cell cultures, expression is
strongly modulated by two interacting elements on either side of the
promoter, each of which contains a sequence with the potential to adopt an
unusual DNA conformation. While each of these flanking elements reduces
expression when added alone to the core promoter, each counteracts the
negative influence of the other when both elements are present.
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