Regulation of gene expression of rat skeletal muscle/liver 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase. Isolation and characterization of a glucocorticoid response element in the first intron of the gene.
At least two genes encode isoenzymes of rat 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase. Alternative splicing of one of these genes generates a skeletal muscle-specific transcript from an upstream promoter and a liver-specific transcript from a downstream promoter. A potent glucocorticoid response element was identified in the first intron of the gene, i.e. between liver exon I and exon II. The element is approximately 3.5 kilobase pairs (kb) downstream of the liver isoenzyme transcription start site and 13 kb upstream of exon II of the gene and confers dexamethasone-sensitive expression of chloramphenicol acetyltransferase (CAT) activity from a heterologous thymidine kinase promoter and from both homologous 5'-flanking regions of the gene. This glucocorticoid response element also exhibits androgen- but not estrogen-sensitive expression of CAT activity in HeLa cells cotransfected with the appropriate receptor expression vector. DNase footprint and sequence analysis revealed that the element is comprised minimally of two adjacent 15-mer glucocorticoid receptor dimer binding sites situated in opposite orientations. Glucocortcoid regulation of 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase gene expression in liver and skeletal muscle is mediated by a single complex glucocorticoid response element located in the first intron of the skeletal muscle/liver gene.
Lange
A J
AJ
Department of Physiology and Biophysics, State University of New York, Stony Brook 11794-8661.
Espinet
C
C
Hall
R
R
el-Maghrabi
M R
MR
Vargas
A M
AM
Miksicek
R J
RJ
Granner
D K
DK
Pilkis
S J
SJ
D000818:Animals; D001483:Base Sequence; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics / Q000378:metabolism; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D003907:Dexamethasone / Q000494:pharmacology*; D005091:Exons; D015971:Gene Expression Regulation, Enzymologic; D005796:Genes / Q000187:drug effects; D005809:Genes, Regulator / Q000187:drug effects; D015698:Genomic Library; D007438:Introns; D007527:Isoenzymes / Q000235:genetics*; D008099:Liver / Q000201:enzymology*; D008969:Molecular Sequence Data; D009132:Muscles / Q000201:enzymology*; D015345:Oligonucleotide Probes; D010732:Phosphofructokinase-1 / Q000235:genetics*; D025481:Phosphofructokinase-2; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics*; D010770:Phosphotransferases / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000187:drug effects; D012326:RNA Splicing; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015183:Restriction Mapping; D013937:Thymidine Kinase / Q000235:genetics; D014158:Transcription, Genetic
D007527:Isoenzymes; D015345:Oligonucleotide Probes; D011993:Recombinant Fusion Proteins; D003907:Dexamethasone; D004247:DNA; D015500:Chloramphenicol O-Acetyltransferase; D010770:Phosphotransferases; D025481:Phosphofructokinase-2; D010732:Phosphofructokinase-1; D013937:Thymidine Kinase; D010744:Phosphoric Monoester Hydrolases