Metachromatic leukodystrophy (MLD) is an autosomal recessive demyelinating lysosomal storage disease caused by deficiency of lysosomal arylsulfatase A (ARSA). The enzyme defect results in the accumulation of sulfatide in the central and peripheral nervous systems and extensive white matter damage and loss of both cognitive and motor functions. Mutated PSAP gene resulting in sphingolipid activator protein B deficiency is known to cause MLD variant in which ARSA is normal.
Category
Inherited metabolic disorder, Lysosomal disease
Brite
Human diseases in ICD-11 classification [BR:br08403]
05 Endocrine, nutritional or metabolic diseases
Metabolic disorders
Inborn errors of metabolism
5C56 Lysosomal diseases
H00127 Metachromatic leukodystrophy
Pathway-based classification of diseases [BR:br08402]
Lipid/glycolipid metabolism
nt06014 Sphingolipid degradation
H00127 Metachromatic leukodystrophy
Kuchar L, Ledvinova J, Hrebicek M, Myskova H, Dvorakova L, Berna L, Chrastina P, Asfaw B, Elleder M, Petermoller M, Mayrhofer H, Staudt M, Krageloh-Mann I, Paton BC, Harzer K
Title
Prosaposin deficiency and saposin B deficiency (activator-deficient metachromatic leukodystrophy): report on two patients detected by analysis of urinary sphingolipids and carrying novel PSAP gene mutations.
