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- W4247605280 abstract "Although small deletions, splice site abnormalities, missense, and nonsense mutations have been identified in patients with factor VII deficiency, there have been no reports of mutations in the factor VII promoter. We investigated a girl with factor VII levels that were less than 1% of normal in association with a severe bleeding diathesis. The patient is homozygous for a T to G transversion that occurs 61 bp before the translation start site. This nucleotide is in a sequence that is an hepatocyte nuclear factor 4 (HNF-4) binding site within the factor VII promoter (ACTTTG Æ → ACGTTG). Using gel mobility shift assays, we show that the mutation disrupts the binding of HNF-4 to its cognate binding site. In growth hormone reporter gene assays, the activity of a plasmid containing the mutant promoter was 6.7% of the wild-type promoter plasmid. Although HNF-4 was able to transactivate the wild-type factor VII promoter 5.4-fold in HeLa cells, no transactivation could be shown with the mutant promoter. These findings indicate that HNF-4 exerts a major positive regulatory effect on factor VII expression and provides in vivo evidence that binding of this transcription factor is critical for normal factor VII expression." @default.
- W4247605280 created "2022-05-12" @default.
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- W4247605280 date "1997-01-01" @default.
- W4247605280 modified "2023-10-16" @default.
- W4247605280 title "Severe Factor VII Deficiency Due to a Mutation Disrupting a Hepatocyte Nuclear Factor 4 Binding Site in the Factor VII Promoter" @default.
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- W4247605280 doi "https://doi.org/10.1182/blood.v89.1.176.176_176_182" @default.
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