Characterization of the chromosomal gene and promoter for human insulin-like growth factor binding protein-5

To better understand the regulation of insulin-like growth factor binding protein-5 (IGFBP-5) expression, we cloned the IGFBP-5 gene from human genomic libraries and identified a region in the 5' flanking sequence which functions as a promoter. The human IGFBP-5 gene is divided into four exons...

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Veröffentlicht in:The Journal of biological chemistry 1994-04, Vol.269 (14), p.10891-10898
Hauptverfasser: ALLANDER, S. V, LARSSON, C, EHRENBORG, E, SUWANICHKUL, A, WEBER, G, MORRIS, S. L, BAJALICA, S, KIEFER, M. C, LUTHMAN, H, POWELL, D. R
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container_end_page 10898
container_issue 14
container_start_page 10891
container_title The Journal of biological chemistry
container_volume 269
creator ALLANDER, S. V
LARSSON, C
EHRENBORG, E
SUWANICHKUL, A
WEBER, G
MORRIS, S. L
BAJALICA, S
KIEFER, M. C
LUTHMAN, H
POWELL, D. R
description To better understand the regulation of insulin-like growth factor binding protein-5 (IGFBP-5) expression, we cloned the IGFBP-5 gene from human genomic libraries and identified a region in the 5' flanking sequence which functions as a promoter. The human IGFBP-5 gene is divided into four exons which, primarily due to a first intron of approximately 25 kilobases, span approximately 33 kilobases of DNA. Southern analysis identified a single copy of the IGFBP-5 gene in the haploid human genome, and several independent mapping strategies found this gene tightly linked with, and in opposite transcriptional orientation to, the IGFBP-2 gene at chromosomal region 2q33-34. Primer extension studies identified the IGFBP-5 mRNA cap site 772 base pairs (bp) 5' to the first nucleotide of the translation start codon. Analysis of the 5'-flanking sequence identified a potential TATA element beginning 33 bp 5' to the mRNA cap site. When a DNA fragment containing this cap site and 461 bp of upstream sequence was placed 5' to the chloramphenicol acetyltransferase reporter gene and transfected into MDA-MB-468 human breast cancer cells, it directed chloramphenicol acetyltransferase expression in an orientation-specific manner, suggesting that this region contains elements essential for IGFBP-5 promoter activity.
doi_str_mv 10.1016/S0021-9258(17)34142-X
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Amino Acid Sequence
Base Sequence
Biological and medical sciences
Carrier Proteins - genetics
Carrier Proteins - metabolism
Cells, Cultured
Chromosome Mapping
Chromosomes, Human
DNA, Complementary
Fundamental and applied biological sciences. Psychology
Genes. Genome
Humans
Insulin-Like Growth Factor Binding Protein 5
Molecular and cellular biology
Molecular genetics
Molecular Sequence Data
Promoter Regions, Genetic
RNA, Messenger - metabolism
Somatomedins - metabolism
title Characterization of the chromosomal gene and promoter for human insulin-like growth factor binding protein-5
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