" /> Gm2-gangliosidosis, ab variant - CISMeF





Preferred Label : Gm2-gangliosidosis, ab variant;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Tay-sachs disease, ab variant; Hexosaminidase activator deficiency; Ab variant gm2-gangliosidosis; Gm2 activator deficiency;

Description : The GM2-gangliosidoses are a group of disorders caused by excessive accumulation of ganglioside GM2 and related glycolipids in the lysosomes, mainly of neuronal cells. GM2-gangliosidosis AB variant is characterized by normal hexosaminidase A (HEXA; 606869) and hexosaminidase B (HEXB; 606873) but the inability to form a functional GM2 activator complex. The clinical and biochemical phenotype of the AB variant is very similar to that of classic Tay-Sachs disease (see 272800) (Gravel et al., 2001).;

Inheritance : Autosomal recessive;

Molecular basis : Caused by mutation in the GM2 activator gene (GM2A, 613109.0001);

Laboratory abnormalities : Gm2-ganglioside accumulation in tissues;

Prefixed ID : #272750;

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30/07/2025


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