Transcriptional control of neuropeptide gene expression in sensory neurons, using the preprotachykinin-A gene as a model.

Control of neuropeptide gene expression in sensory neurons is determined in part by a variety of tissue-specific, developmental, and stimulus-induced transcription factors that interact with the promoters of these genes. We have analysed the regulation of the rat preprotachykinin-A (rPPT) gene, which is expressed in a subset of dorsal root ganglia neurons. A region of the promoter encompassing approximately 1300 base pairs spanning the transcriptional start site has been analysed in detail both by functional analysis of promoter activity in clonal cell lines and dorsal root ganglia neurons grown in culture and by in vitro characterisation of transcription factor interaction with this region. Interestingly our analysis indicates an important role in rPPT gene expression for the E box transcription factor family. This class of transcription factor has been demonstrated to be a major determinant of calcitonin gene related peptide (CGRP) expression, which is also expressed in dorsal root ganglia neurons often under similar conditions as rPPT. In addition, multiple regulatory domains have been identified in the rPPT promoter, which act as activators in a variety of cell types. These elements are silenced in the context of the rPPT promoter in many non-neuronal cells. Therefore, tissue-specific expression of reporter genes directed by the rPPT promoter in transient transfection is determined in part by a variety of silencer elements, which act to repress the function of several domains that act as constitutive enhancers of expression in a wide range of cells. Removal or modulation of silencer elements in the rPPT promoter allows activity in a wider variety of cell types. We postulate that control of rPPT gene expression is the results of dynamic interplay of both positive and negative regulatory elements, a phenomenon observed in several other neuronal-specific genes, including that encoding CGRP.

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