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|Title:||Promoter region of the transcriptional unit for human α1-chimaerin, a neuron-specific GTPase-activating protein for p21rac|
|Authors:||Dong, J.-M. |
neuronal gene expression
|Citation:||Dong, J.-M., Smith, P., Hall, C., Lim, L. (1995). Promoter region of the transcriptional unit for human α1-chimaerin, a neuron-specific GTPase-activating protein for p21rac. European Journal of Biochemistry 227 (3) : 636-646. ScholarBank@NUS Repository. https://doi.org/10.1111/j.1432-1033.1995.tb20183.x|
|Abstract:||α1-chimaerin is a neuron-specific GTPase-activating protein for p21rac, a protein involved in morphological events. The mRNA is highly expressed in certain brain regions. It is also detected in cultured neuronal, but not in non-neuronal cells. As a first step towards understanding the mechanisms underlying this regulation, genomic clones containing the 5'-flanking region of the human α1-chimaerin transcriptional unit were isolated and characterised. A cluster of multiple transcription start sites of α1-chimaerin mRNAs was detected by primer-extension and S1-mapping analyses. The cluster was mapped to nucleotides -464 to -434 (relative to nucleotide A in the initiation codon) in genomic DNA. The 5'-proximal region contained no TATA box, initiator motif and Sp1-binding site. A 210-bp fragment with approximately 110 bp 5'-flanking sequence could function as a minimal promoter upon analysis using hybrid chloramphenicol acetyltransferase reporter constructs and transient transfection. Internal deletion and point-mutation experiments revealed that a GGCCAATC sequence located at nucleotides -519 to -512 was essential for α1-chimaerin promoter activity. Mobility-shift assay showed the specific binding of nuclear factor(s) to this region, which was competed by the oligonucleotides corresponding to wild-type but not mutant forms. The data also suggest the existence of possible novel CCAAT-binding factor(s) interacting with the α1-chimaerin CCAAT box binding site. A cell-type-preferred suppressor located in the 5'-distal region was found which may play a role in controlling neuron-specific expression of α1-chimaerin mRNA. These findings of a specific promoter for α1-chimaerin transcription will facilitate further studies on its neuronal-specific expression and function.|
|Source Title:||European Journal of Biochemistry|
|Appears in Collections:||Staff Publications|
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