" /> Gm1-gangliosidosis, type I - CISMeF





Preferred Label : Gm1-gangliosidosis, type I;

Symbol : GM1G1;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Gangliosidosis, generalized gm1, type I; Gangliosidosis, generalized gm1, infantile form; Gangliosidosis, generalized gm1, type 1; Beta-galactosidase-1 deficiency; Glb1 deficiency;

Included titles and symbols : Gm1-gangliosidosis, type I, with cardiac involvement; Gangliosidosis, generalized gm1, type I, with cardiac involvement;

Description : GM1-Gangliosidosis is an autosomal recessive lysosomal storage disease characterized by accumulation of ganglioside substrates in lysosomes. Clinically, patients show variable degrees of neurodegeneration and skeletal abnormalities. There are 3 main clinical variants categorized by severity and variable residual beta-galactosidase activity. Type I, or infantile form, shows rapid psychomotor deterioration beginning within 6 months of birth, generalized central nervous system involvement, hepatosplenomegaly, facial dysmorphism, macular cherry-red spots, skeletal dysplasia, and early death. Type II, or late-infantile/juvenile form (230600), has onset between 7 months and 3 years, shows generalized central nervous system involvement with psychomotor deterioration, seizures, localized skeletal involvement, and survival into childhood. Hepatosplenomegaly and cherry-red spots are usually not present. Type III, or adult/chronic form (230650), shows onset from 3 to 30 years and is characterized by localized skeletal involvement and localized central nervous system involvement, such as dystonia or gait or speech disturbance. There is an inverse correlation between disease severity and residual enzyme activity (Suzuki et al., 2001). See also Morquio B disease (253010), an allelic disorder with skeletal anomalies and no neurologic involvement. The GM2-gangliosidoses include Tay-Sachs disease (272800) and Sandhoff disease (268800).;

Inheritance : Autosomal recessive;

Molecular basis : Caused by mutation in the beta-1 galactosidase gene (GLB1, 611458.0001);

Prefixed ID : #230500;

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16/05/2024


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