Characterization of the 5'-flanking region and chromosomal assignment of the human brain natriuretic peptide gene.
Brain natriuretic peptide (BNP) is a cardiac hormone that occurs predominantly in the ventricle, and synthesis and secretion of BNP are greatly augmented in patients with congestive heart failure and in animal models of ventricular hypertrophy. In order to elucidate the molecular mechanisms underlying the human BNP gene expression in the heart, the human BNP gene was isolated from a size-selected genomic minilibrary. The 1.9-kb human BNP 5'-flanking region (-1813 to +110) contained an array of putative cis-acting regulatory elements. Various lengths of the cloned 5'-flanking sequences were linked upstream to the bacterial chloramphenicol acetyltransferase (CAT) gene, and their promoter activities were assayed. The 1.9-kb promoter region showed a high-level CAT activity in cultured neonatal rat ventricular cardiocytes. When the CT-rich sequences (-1288 to -1095) were deleted, the high-level activity was reduced to approximately 30%. The 399-bp BNP 5'-flanking region (-289 to +110) showed approximately 10% activity of the 1.9-kb region. Furthermore, using human-rodent somatic hybrid cell lines, the BNP gene was assigned to human chromosome 1, on which the atrial natriuretic peptide gene is localized. The present study leads to a better understanding of the molecular mechanisms for the human BNP gene expression in the heart.
Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Japan.
Y
Y
Ogawa
H
H
Itoh
O
O
Nakagawa
G
G
Shirakami
N
N
Tamura
T
T
Yoshimasa
K
K
Nagata
N
N
Yoshida
K
K
Nakao
D000818:Animals; D000831:Animals, Newborn; D001483:Base Sequence; D002460:Cell Line; D002478:Cells, Cultured; D015500:Chloramphenicol O-Acetyltransferase / Q000096:biosynthesis; D002874:Chromosome Mapping; D002878:Chromosomes, Human, Pair 1; D003001:Cloning, Molecular; D015698:Genomic Library; D006352:Heart Ventricles; D006801:Humans; D006822:Hybrid Cells; D008969:Molecular Sequence Data; D016296:Mutagenesis; D009206:Myocardium / Q000378:metabolism*; D020097:Natriuretic Peptide, Brain; D009419:Nerve Tissue Proteins / Q000096:biosynthesis* / Q000235:genetics*; D009838:Oligodeoxyribonucleotides; D011401:Promoter Regions, Genetic; D051381:Rats; D011994:Recombinant Proteins / Q000096:biosynthesis; D012045:Regulatory Sequences, Nucleic Acid; D012377:Rodentia; D017384:Sequence Deletion; D014158:Transcription, Genetic; D014162:Transfection
D009419:Nerve Tissue Proteins; D009838:Oligodeoxyribonucleotides; D011994:Recombinant Proteins; D020097:Natriuretic Peptide, Brain; D015500:Chloramphenicol O-Acetyltransferase