Molecular cloning and characterization of the gene encoding human NeuroD.
NeuroD is a basic helix-loop-helix transcription factor that binds to an E-box sequence, CANNTG, in the target gene promoter region. The gene encoding NeuroD is expressed specifically in brain, intestine, and pancreatic cells and plays a pivotal role in tissue-specific differentiation. To investigate the regulation of human NeuroD gene expression, we isolated and sequenced a genomic DNA containing two exons and flanking regions of the NeuroD gene. The sizes of exons 1 and 2 were 168 and 2404 bp, respectively. CAT reporter analysis showed that the elements responsible for basal promoter activity lay in the proximal 408-bp region. Cotransfection of the CAT reporter plasmids with a NeuroD expression plasmid resulted in 5-fold enhancement of the CAT activity, indicating an autoregulatory mechanism is involved in human NeuroD gene expression.
Yoon
Y S
YS
Department of Biochemistry, Yamaguchi University School of Medicine, Ube, Japan.
Noma
T
T
Yamashiro
Y
Y
Ito
H
H
Nakazawa
A
A
D000595:Amino Acid Sequence; D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins; D001921:Brain / Q000378:metabolism; D002454:Cell Differentiation; D015500:Chloramphenicol O-Acetyltransferase / Q000096:biosynthesis / Q000235:genetics; D003001:Cloning, Molecular; D005091:Exons; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D018257:Helix-Loop-Helix Motifs; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics*; D009928:Organ Specificity; D010179:Pancreas / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000737:chemistry
D051792:Basic Helix-Loop-Helix Proteins; D015500:Chloramphenicol O-Acetyltransferase; D009419:Nerve Tissue Proteins; D011993:Recombinant Fusion Proteins; C093564:Neurogenic differentiation factor 1