In utero injection of α-L-iduronidase-carrying retrovirus in canine mucopolysaccharidosis type I: Infection of multiple tissues and neonatal gene expression

Lisa Meertens, Donald Kohn, Stephen Kruth, Margaret R. Hough, Ian D. Dubé, Yongjun Zhao, Suzana Rosic-Kablar, Liheng Li, Kin Chan, Howard Dobson, Cathy Gartley, Carolyn Lutzko, John Hopwood

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33 Citations (Scopus)


Canine α-L-iduronidase (α-ID) deficiency is caused by a single base pair mutation in the α-ID gene, resulting in no enzyme activity in homozygous affected pups. The disease clinically resembles human mucopolysaccharidosis type I (MPSI). We used the canine MPSI model system to address the efficacy of a new retroviral vector, MND-MFG, containing the human α-ID cDNA (MND-MFG-α-ID) for direct in utero gene delivery to MPSI cells. In vitro, the MND-MFG-α-ID vector showed high-level, long-term expression of the transgene in both canine and human α-ID-deficient fibroblasts. The effectiveness of this vector for in utero gene transfer and expression in multiple tissues was assessed by injecting viral supernatants into MPSI fetuses and evaluating transduction efficiency and enzyme expression at various times after birth. Transduction of a spectrum of cell types and tissues was observed in all seven live-born pups and in one stillborn pup. Although enzyme activity was not detected in adult tissues from the seven surviving pups, significant α-ID enzyme activity was detected in both the liver and kidney of the deceased pup. Our combined gene delivery vector and in utero transfer approach, while encouraging in terms of overall gene transfer efficiency to multiple tissues and successful short-term gene expression, was unable to meet the important requirement of sustained in vivo gene expression.

Original languageEnglish
Pages (from-to)1809-1820
Number of pages12
JournalHuman Gene Therapy
Issue number15
Publication statusPublished or Issued - 2002

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology
  • Genetics

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