AAV-encoded OTC activity persisting to adulthood following delivery to newborn spf(ash) mice is insufficient to prevent shRNA-induced hyperammonaemia.

Abstract:

:Urea cycle defects presenting in the neonatal period with hyperammonaemia are associated with high morbidity and mortality, and necessitate liver transplantation for long-term management. Gene therapy is therefore an attractive possibility, with vectors based on adeno-associated virus (rAAV) currently showing exciting promise in liver-targeted clinical trials in adults. Successful use of rAAV vectors in infants, however, is more challenging as episomal rAAV genomes will be lost from proliferating hepatocytes during liver growth, leaving stable transgene expression dependent on the subset of vector genomes that undergo genomic integration. To explore this challenge, we exploited the partially ornithine transcarbamylase (OTC)-deficient spf(ash) mouse model and small hairpin RNA-mediated knockdown of residual endogenous OTC enzyme activity in adult mice that had received neonatal treatment with an OTC-encoding rAAV. This leaves mice reliant on vector-encoded OTC activity that has persisted from the newborn period. Despite stable transduction in approximately 8% of hepatocytes and residual vector-encoded OTC activity of up to 33% of wild-type, well above endogenous spf(ash) levels (5-7%), mice were not protected from hyperammonaemia. These data show that the distribution of OTC activity within the liver is critical and that rAAV vector re-delivery after early neonatal treatment is likely to be necessary for stable control of hyperammonaemia into adulthood.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Cunningham SC,Kok CY,Spinoulas A,Carpenter KH,Alexander IE

doi

10.1038/gt.2013.51

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

1184-7

issue

12

eissn

0969-7128

issn

1476-5462

pii

gt201351

journal_volume

20

pub_type

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