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  • lysosome biogenesis  (1)
  • 1
    ISSN: 1573-9368
    Keywords: lysosomal enzyme sorting ; lysosome biogenesis ; I-cell disease ; mannose 6-phosphate ; imprinting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mannose 6-phosphate receptor deficient mice were generated by crossing mice carrying null alleles for Igf2 and the 300 kDa and 46 kDa mannose 6-phosphate receptors, Mpr300 and Mpr46. Pre- and perinatal lethality of mice nullizygous for Igf2, Mpr300 and Mpr46 was increased. Triple deficient mice surviving the first postnatal day had normal viability and developed a phenotype resembling human I-cell disease. The triple deficient mice were characterized by dwarfism, facial dysplasia, waddling gait, dysostosis multiplex, elevated lysosomal enzymes in serum and histological signs of lysosomal storage predominantly in fibroblasts, but also in parenchymal cells of brain and liver. A paternally inherited Mpr300 wild type allele that is normally inactive in mice due to imprinting was reactivated in some tissues of mice lacking IGF II and MPR 46 and carrying a maternal Mpr300 null allele. Inspite of the partial reactivation the phenotype of these mice was similar to that of triple deficient mice.
    Type of Medium: Electronic Resource
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