Targeted disruption of the gene encoding hepatocyte nuclear factor 3gamma results in reduced transcription of hepatocyte-specific genes.

Molecular and Cellular Biology
K H KaestnerG Schütz

Abstract

The winged helix transcription factor hepatocyte nuclear factor 3gamma (HNF3gamma) is expressed in embryonic endoderm and its derivatives liver, pancreas, stomach, and intestine, as well as in testis and ovary. We have generated mice carrying an Hnf3g-lacZ fusion which deletes most of the HNF3gamma coding sequence as well as 5.5 kb of 3' flanking region. Mice homozygous for the mutation are fertile, develop normally, and show no morphological defects. The mild phenotype change of the Hnf3g-/- mice can be explained in part by an upregulation of HNF3alpha and HNF3beta in the liver of the mutant animals. Analysis of steady-state mRNA levels as well as transcription rates showed that levels of expression of several HNF3 target genes (phosphoenolpyruvate carboxykinase, transferrin, tyrosine aminotransferase) were reduced by 50 to 70%, indicating that HNF3gamma is an important activator of these genes in vivo.

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