Gangliosidosis GM1 GLB1 (Shiba Inu Type) Overview
Gangliosidosis GM1 GLB1 (Shiba Inu Type)
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Category: Metabolic - Associated with the enzymes and metabolic processes of cells
Gene: Galactosidase beta 1 (GLB1) on Chromosome 23
Variant Detected: Nucleotide Deletion c.1649delC p.frameshift
Severity: Scale 4 has a high degree of severity. It generally causes a decreased quality of life and may also decrease the life expectancy.
Mode of Inheritance: Autosomal Recessive
Test Overview: GM1 Gangliosidosis Portuguese Water Dog Type is a congenital lysosomal disorder affecting the Portuguese Water Dog breed. It is a progressive neurodegenerative disorder with a fatal outcome. GM1 belongs in a group of lysosomal disorders known as gangliosidosis, caused by the accumulation of lipids gangliosides. In the gangliosidoses group of disorders, other than GM1, belongs another disorder type, known as GM2. There are three forms of GM1: early infantile, late infantile, and adult. Except in Portuguese Water Dogs, GM1 has been reported in Friesian cattle, Siamese and Korat cats, English springer spaniels, and mixed breed beagle dogs. Beta-galactosidase is a hydrolase enzyme located in the lysosomes. It catalyzes breakage of a glycosidic bond, resulting in the hydrolysis of beta-galactosides into monosaccharides. When the gene encoding for beta-galactosidase enzyme is deficient, abnormal storage of acidic lipid materials in cells of the central and peripheral nervous system occurs. GM1 is characterized by low or absent activity of this enzyme in brain and liver.
Research Citation(s): Yamato, O. et al. GM1 gangliosidosis in Shiba dogs. (2000) Vet Rec 146:493-496.
Associated Breed(s): Mixed Breed, Shih tzu, Shiba Inu,