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- W2016017312 abstract "Citrullinemia is an autosomal recessive disorder caused by the deficiency of argininosuccinate synthetase (AS). It is characterized by elevated levels of blood citrulline and ammonia, which often results in hyperammonemic coma and early neonatal death in affected children. We have explored the use of adenoviral vectors as a treatment modality in a murine model of citrullinemia, the Ass mouse. The Ass mouse has no endogenous AS activity due to a targeted interruption of the AS gene. Homozygous mutant animals develop high levels of blood citrulline, become hyperammonemic, and die within 24-48 h after birth. We demonstrated that the neonatal crisis in Ass mice can be ameliorated by the injection of a recombinant adenovirus carrying human AS cDNA (Ad.CMVhAS) within hours after birth. The average life span of the virus-treated animals was extended from 30 +/- 9.5 h to 16.1 +/- 1.6 days. A second viral infusion 14 days after the first dose further prolonged the life span to an average of 36.2 +/- 7.0 days, and to 40.7 +/- 3.3 days with a concurrent daily injection of arginine and sodium benzoate. Significantly increased liver AS activity (47.3 +/- 7.9% of normal) was detected 24 h after viral infusion, which reached peak levels (80-90% of normal) at day 7 and decreased to about 20% of normal within 2-3 weeks after viral infusion. Southern blot analysis of liver DNA revealed a transduction efficiency of about one viral genome per hepatocyte 7 days after viral infusion and a gradual decrease of viral genome per cell parallel to the loss of liver AS activity. Plasma glutamine levels were partially normalized in virus-treated animals and were completely normalized in animals receiving Ad.CMVhAS concurrently with alternative pathway therapy. Plasma arginine levels were also partially normalized. Together, these results demonstrated that the recombinant adenovirus was capable of conferring AS activity in the liver of the recipient animals within 24 h, and the neonatal crisis of hyperammonemia could be averted by acute treatment with the AS containing adenovirus." @default.
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- W2016017312 date "2000-10-01" @default.
- W2016017312 modified "2023-10-16" @default.
- W2016017312 title "Correction of argininosuccinate synthetase (AS) deficiency in a murine model of citrullinemia with recombinant adenovirus carrying human AS cDNA" @default.
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- W2016017312 doi "https://doi.org/10.1038/sj.gt.3301303" @default.
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