Autopsy findings of a patient, with sialidosis type I phenotype carrying V217M/G243R mutations in the lysosomal sialidase gene and biochemically defined isolated sialidase deficiency, who died of intractable lymphoma at the age of 32 years, are described.
In this study, we used Sendai virus reprogramming to generate an induced pluripotent stem cell (iPSC) line carrying the A544G mutation combined with the 667-679 deletion of the NEU1 gene from a sialidosis patient.
Aberrant NEU1 activity is associated with various pathologies including lysosomal storage disorder sialidosis, autoimmune diseases and the malignancy and metastasis of cancer cells.
Our observation indicates that sialidosis should be suspected and the NEU1 gene analyzed in patients with isolated action myoclonus presenting in adulthood in the absence of other typical clinical and laboratory findings.
Here, we report the molecular defects underlying sialidosis (mutations in sialidase; gene NEU1), galactosialidosis (mutations in cathepsin A; gene PPGB) and GM1 gangliosidosis (mutations in β-galactosidase; gene GLB1) in Portuguese patients.
Autopsy findings of a patient, with sialidosis type I phenotype carrying V217M/G243R mutations in the lysosomal sialidase gene and biochemically defined isolated sialidase deficiency, who died of intractable lymphoma at the age of 32 years, are described.
Sialidosis (NEU1 deficiency) and galactosialidosis (combined NEU1 and β-gal deficiency, secondary to a primary defect of PPCA) belong to the glycoprotein storage diseases, whereas GM1-gangliosidosis (β-gal deficiency) is a glycosphingolipid storage disease.
The specific N-glycosylated proteins detected on MAM lectin blotting as well as the granular lysosomal fluorescence due to an avidin-FITC/biotinylated MAM lectin conjugate in sialidosis and galactosialidosis fibroblasts disappeared in parallel with the restoration of the intracellular NEU1 activity after transfection of the recombinant NEU1 fused to HA tag sequence and the wild-type PPCA cDNA as well as administration of the recombinant PPCA precursor protein.
Sialidosis (McKusick 256550) is an autosomal recessive disorder resulting from mutations in the NEU gene, located in 6p21.3, which leads to deficiency of alpha-N-acetyl neuraminidase (sialidase) activity, causing an accumulation of its substrates, oligosaccharides, in the lysosomes of various organs and tissues and an increased presence in urine and other organic fluids.
Mice nullizygous at the Neu1 locus develop clinical abnormalities reminiscent of early-onset sialidosis in children, including severe nephropathy, progressive edema, splenomegaly, kyphosis and urinary excretion of sialylated oligosaccharides.
Sialidosis is an autosomal recessive disease caused by the genetic deficiency of lysosomal sialidase, which catalyzes the catabolism of sialoglycoconjugates.
Sialidosis is an autosomal recessive disease caused by the genetic deficiency of lysosomal sialidase, which catalyzes the hydrolysis of sialoglycoconjugates.