Glucose-dependent liver gene expression in upstream stimulatory factor 2 -/- mice.
Upstream stimulatory factors (USF) 1 and 2 belong to the Myc family of transcription factors characterized by a basic/helix loop helix/leucine zipper domain responsible for dimerization and DNA binding. These ubiquitous factors form homo- and heterodimers and recognize in vitro a CACGTG core sequence termed E box. Through binding to E boxes of target genes, USF factors have been demonstrated to activate gene transcription and to enhance expression of some genes in response to various stimuli. In particular, in the liver USF1 and USF2 have been shown to bind in vitro glucose/carbohydrate response elements of glycolytic and lipogenic genes and have been proposed, from ex vivo experiments, to be involved in their transcriptional activation by glucose. However, the direct involvement of these factors in gene expression and nutrient gene regulation in vivo has not yet been demonstrated. Therefore, to gain insight into the specific role of USF1 and USF2 in vivo, and in particular to determine whether the USF products are required for the response of genes to glucose, we have created, by homologous recombination, USF2 -/- mice. In this paper, we provide the first evidence that USF2 proteins are required in vivo for a normal transcriptional response of L-type pyruvate kinase and Spot 14 genes to glucose in the liver.
Vallet
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Institut Cochin de Génétique Moléculaire, Université René Descartes, 24 rue du Faubourg Saint-Jacques, 75014 Paris, France.
Henrion
A A
AA
Bucchini
D
D
Casado
M
M
Raymondjean
M
M
Kahn
A
A
Vaulont
S
S
D000818:Animals; D004268:DNA-Binding Proteins / Q000502:physiology; D004040:Dietary Carbohydrates / Q000494:pharmacology; D019281:Dimerization; D015870:Gene Expression; D018390:Gene Targeting; D005947:Glucose / Q000378:metabolism*; D018257:Helix-Loop-Helix Motifs; D008099:Liver / Q000196:embryology / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D009687:Nuclear Proteins; D011401:Promoter Regions, Genetic; D011506:Proteins / Q000235:genetics; D011770:Pyruvate Kinase / Q000235:genetics; D012333:RNA, Messenger / Q000378:metabolism; D014157:Transcription Factors / Q000502:physiology*; D051720:Upstream Stimulatory Factors
D004268:DNA-Binding Proteins; D004040:Dietary Carbohydrates; D009687:Nuclear Proteins; D011506:Proteins; D012333:RNA, Messenger; C051065:THRSP protein, human; C501477:Thrsp protein, mouse; D014157:Transcription Factors; D051720:Upstream Stimulatory Factors; C497183:Usf1 protein, mouse; C497186:Usf2 protein, mouse; D011770:Pyruvate Kinase; D005947:Glucose