Journal of Neuroscience, Vol 14, 7393-7403, Copyright © 1994 by Society for Neuroscience
Bidirectional promoter of human monoamine oxidase A (MAO A) controlled by transcription factor Sp1
QS Zhu, K Chen and JC Shih
Department of Molecular Pharmacology and Toxicology, School of Pharmacy, University of Southern California, Los Angeles 90033.
The core promoter region of human monoamine oxidase (MAO) A has been
identified in the two 90 bp repeat sequences, which can be further divided
into four imperfect tandem repeats, each containing an Sp 1 binding site in
the reversed orientation. Gel retardation and DNase 1 footprinting assays
identified Sp 1 to be the major transcription factor binding to MAO A core
promoter. In addition, positive association has been observed between
cellular Sp1 concentration and MAO A promoter or catalytic activity,
indicating that Sp1 is a controlling factor for human MAO A expression. DNA
fragments from MAO A core promoter exhibit promoter activity in both
orientations in a transient transfection assay, using human growth hormone
as the reporter gene. A DNA probe isolated from upstream of the core
promoter detected positive signals in a Northern analysis, suggesting that
the reverse promoter activity may endogenously transcribe a new gene
located upstream of MAO A.