Lysomale Speichererkankung

The Crocodile

GM1-Gangliosidosis

GM1-gangliosidosis caused by lack of ß-galactosidase has characteristics of mucopolysacharidosis and sphingolipidosis. ß-galactosidase plays a role in both metabolic pathways and is deficient in this disease. Macrocephalus and dysostosis multiplex are findings whose cause can be found in the defect of the mucopolysaccharide metabolism. In contrast, neurological findings - motor developmental disorder, pyramidal tract signs, cherry-red spot, epilepsy and mental retardation - are to be interpreted in terms of sphingolipidosis. In the course of the disease, pronounced spastic cerebral palsy dominates the clinical picture.  Attenuated forms of cerebral palsy can be accompanied by no coarse facial features, macrocephalus and cherry-red spots.  

GM1-Gangliosidosis | SphinCS - Clinical Science for LSD

Etiology: Deficiency of beta-galactosidase
Gene: GLB1 Gene
Mode of inheritance: Autosomal recessive
Phenotypes:

  • Infantile form
  • Late-infantile form
  • Juvenile form

Leading symptoms:
Infantile form
(Age of onset: ≤ 6 months)

  • Hepatosplenomegaly
  • Development delay/ regression
  • Muscular hypotonia
  • Cherry red spot
  • Dysostosis multiplex
  • Severe tetra spasticity

Late-infantile form
(Age of onset: > 6 months -3 years)

  • Development delay/ regression
  • Epilepsy
  • Muscular hypotonia
  • Dysostosis multiplex

Juvenile form
(Age of onset: > 3 years)

  • Ataxia
  • Dysarthria
  • Dystonia/dystonic spastic movement disorder
  • Cognitive impairment

Diagnostics:

  • Measurement of the activity of beta-galactosidase in leucocytes or dried blood spot
  • Molecular genetic analysis of GLB1 Gene

Therapy:
Only symptomatic

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