- Glucocerebrosidase deficiency
- Glucosylceramide deficiency
For details about specimen requirements, please refer to: Specimen Type & Requirement (PDF).
- Blood: 5-10 mL in EDTA, 0.5 mL in EDTA (neonate);
- DNA-minimum 10 ug in 100 uL low TE (pH8.0)
For details about specimen requirements, please refer to: Specimen Type and Requirements
If sample shipment >48 hours, ship on ice.
Gaucher disease (GD) is the most common lipid-storage disorder, with variable symptoms ranging from no outward symptoms to severe disability. The most common symptoms of Gaucher disease are enlargement of the liver and spleen, anemia, reduced platelets (resulting in easy bruising and long clotting times), bone pain and osteoporosis. There are three clinical forms of Gaucher disease, which are distinguished by the occurrence and form of neurological involvement. Type 1 GD does not have any neurological symptoms. Type 2 GD is characterized by severe neurological symptoms, and is usually fatal during the first three years of life. Type 3 GD also shows neurological symptoms, but they appear later in childhood and progress more slowly than the symptoms of Type 2 GD.
Gaucher disease is an autosomal recessive disorder caused by mutations in the acid b-glucosidase (GBA) gene, located on chromosome 1 (1p21 p23). Although GD has been reported in individuals of various ethnic backgrounds, it occurs most often in people of Ashkenazi Jewish ancestry. Over 100 different mutations in this gene have been identified in affected patients; however four mutations in the GBA gene account for over 90% of the mutations seen in Ashkenazi Jewish individuals affected with Gaucher disease [84G>GG, IVS2(+1)G>A, N370S and L444P]. These four mutations account for 50-60% of disease-causing alleles seen in the non-Jewish population. Non-Jewish individuals with Gaucher disease tend to be compound heterozygotes with one common mutation and one 'rare' mutation of which four are tested for in this panel [D55bp, V394L, D409H and R496H].
To be affected with GD, an individual must have two mutations in the GBA gene (one inherited from each parent); these may or may not be identical mutations. Any person with one copy of the defective GBA gene is a Gaucher disease carrier. Carriers do not have, and will not develop, Gaucher disease. However, if two carriers wish to have children, there is a one in four chance (25%) that their baby will be born with the disease. There is a three in four chance (75%) that their baby will not have Gaucher disease.
An accurate biochemical test is available for the diagnosis of Gaucher disease consisting of the analysis of b-glucosidase activity in plasma, leucocytes or cultured cells. This test should be considered before molecular analysis is undertaken. Molecular identification of the mutation in individuals with a confirmed diagnosis can be used for carrier testing and prenatal diagnosis in the family. The biochemical test is not reliable for identifying carriers.
See related information sheet: Ashkenazi Jewish Screening Panel
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