RGD Reference Report - Cloning of MafG homologue from the rat brain by differential display and its expression after hypercapnic stimulation. - Rat Genome Database

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Cloning of MafG homologue from the rat brain by differential display and its expression after hypercapnic stimulation.

Authors: Shimokawa, N  Okada, J  Miura, M 
Citation: Shimokawa N, etal., Mol Cell Biochem 2000 Jan;203(1-2):135-41.
RGD ID: 633305
Pubmed: PMID:10724342   (View Abstract at PubMed)

The ventral medullary surface (VMS) is a site of the medullary chemoreceptor neurons which sense excess protons (H+) derived from hypercapnia and facilitate respiration. We hypothesized that expression of genes involved in H+-sensitivity is higher in the VMS than in other central nervous system areas. By using the differential display technique, we differentiated the mRNAs of VMS neurons from those of cerebral cortical neurons. Seventeen clones of interest were isolated, and sequence analysis revealed that one of these clones had an encoding nuclear transcription factor, MafG. MafG is a member of Maf protein family, and the founding member of the family (v-Maf) was originally discovered as the transduced transforming component of avian musculoaponeurotic fibrosarcoma virus, AS42. The rat MafG was composed of 162 amino acid residues and was conserved among the primary structures of various species. Expression of rat mafG mRNA is high in the VMS, heart and skeletal muscle while the cerebral cortex, cerebellum, liver, stomach and intestine show moderate expression. To determine whether the expression of mafG mRNA is induced by hypercapnic stimulation, 7% CO2 in air was inhaled to rats for 5 min. We found that the hypercapnic stimulation induced the gene expression of mafG. These results suggest that MafG may be involved in H+-sensitivity and respiratory regulation in the VMS.



Objects referenced in this article
Gene Mafg MAF bZIP transcription factor G Rattus norvegicus

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