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Infantile GM1 Gangliosidosis with Epilepsy Associated with a Same-Codon GLB1 Variant (c.808T>G/c.808T>C)
Rimma Gamirova1, Arina Grishagina1, Elena Gorobets2
1Neurocognitive Research Laboratory, Department of Neurology with Courses in Psychiatry, Clinical Psychology, and Medical Genetics, Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, 18 Kremlevskaya St., Kazan 420008, Russia.
This study details a novel compound heterozygous allelic combination (p.Tyr270Asp and p.Tyr270His) in the GLB1 gene causing severe infantile GM1 gangliosidosis. Codon 270 is a critical hotspot for beta-galactosidase activity.
Area of Science:
- Genetics and Molecular Biology
- Biochemistry
- Rare Diseases
Background:
- GM1 gangliosidosis is a lysosomal storage disorder due to beta-galactosidase deficiency from GLB1 gene variants.
- Over 300 pathogenic variants are known, causing a spectrum from GM1 gangliosidosis to MPS IVB.
- Disease severity correlates with impaired enzymatic activity, particularly substrate binding.
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