Question: Which enzyme is deficient in Krabbe disease?

Context:
Krabbe disease is a lethal, demyelinating condition caused by genetic deficiency of galactocerebrosidase (GALC) and resultant accumulation of its cytotoxic substrate, psychosine (galactosylsphingosine), primarily in oligodendrocytes (OLs).
In this study, we report that accumulation of endogenous psychosine under GALC deficient Krabbe conditions impedes OL differentiation process both by decreasing the expression of myelin lipids and protein and by inducing the cell death of maturating OLs.
In almost all individuals with Krabbe disease, galactocerebrosidase (GALC) enzyme activity is deficient (0%-5% of normal activity) in leukocytes isolated from whole heparinized blood or in cultured skin fibroblasts.
This chapter describes in detail a practical procedure for the preparation of radiolabeled galactocerebroside and its use in the assay of galactocerebrosidase (GalCase), the enzyme deficient in globoid cell leukodystrophy (Krabbe disease).
Globoid cell leukodystrophy (Krabbe disease) is an inherited neurological disorder caused by the pathogenomic accumulation of psychosine (galactosylsphingosine), a substrate for the deficient enzyme galactocerebroside beta-galactosidase.
Krabbe disease is an extremely rare condition with an incidence of 1 in 1,00,000 live births. It is caused by deficient activity of the Iysosomal hydrolase galactosylceramide beta-galactosidase.
Globoid cell leukodystrophy (Krabbe disease) is characterized by the accumulation of a toxic metabolite, psychosine (galactosylsphingosine), which is a substrate for the deficient enzyme (galactocerebroside beta-galactosidase).
Krabbe disease (globoid-cell leukodystrophy; GLD) is caused by mutations in the GALC gene. Beta-galactocerebrosidase (GALC) is a specific beta-galactosidase which is defective in GLD.
Both galactosylceramide beta-galactosidase (GALC-GC) and GALC-PS activities were reduced by at least 85% of the normal in all but 2 of the 10 GLD patients studied.
Krabbe disease, or globoid cell leukodystrophy, is an autosomal recessive disorder caused by the deficiency of galactocerebrosidase (GALC) activity.
The disease can be diagnosed by detecting the deficiency of GALC activity (less than 5% of normal) in any available tissue sample.
Globoid cell leukodystrophy, or Krabbe disease, is a severe disorder of the peripheral and central nervous system myelin caused by deficient galactocerebrosidase (GALC) activity.
Globoid cell leukodystrophy (GCL or Krabbe disease) is a recessive disease caused by mutations of the lysosomal enzyme galactocerebrosidase (GALC) and twitcher is the murine model of GCL.
Galactocerebrosidase (GALC) is the lysosomal enzyme deficient in human and certain animal species with globoid cell leukodystrophy (GLD) or Krabbe disease.
Globoid-cell leukodystrophy (GLD) is an autosomal recessive inherited disorder caused by the deficiency of galactocerebrosidase, the lysosomal enzyme responsible for the degradation of the myelin glycolipid galactocerebroside.
Krabbe disease is an autosomal recessive inherited demyelinating disease, which is deficient in lysosomal enzyme, galactocerebrosidase.
Galactocerebrosidase (GALC) activity is deficient in all patients with globoid cell leukodystrophy (GLD).
Human galactocerebrosidase, the enzyme deficient in Krabbe disease, was purified, through several hydrophobic column steps and gel filtration, 22,650-fold from human lymphocytes
Globoid cell leukodystrophy (Krabbe disease) is an autosomal recessive disorder resulting from the deficiency of galactocerebrosidase (GALC) activity.
6-Hexadecanoylamino-4-methylumbelliferyl-beta-D-galactopyranoside (HMGal) has been shown to be a specific fluorogenic substrate of galactocerebrosidase and to facilitate the simple enzymatic diagnosis of Krabbe disease in human patients and in twitcher mice.
The inherited deficiency of galactosylceramide beta-galactosidase (E.C. 3.2.1.46: galactocerebrosidase) activity results in globoid cell leukodystrophy in humans (Krabbe disease) and in mice (twitcher mutant).
The lack of complementation between Krabbe disease patient and twitcher mutant mouse cells provides further evidence that the twitcher mouse is an authentic murine model for Krabbe disease and supports the hypothesis that the mutations in both species are within the structural gene for the galactocerebrosidase enzyme.
Galactosylceramide beta-galactosidase cross reacting material was demonstrated in brain, liver, and skin fibroblasts from patients with Krabbe disease.
. In this study, LRs in the brain of the twitcher (TWI) mouse, a bona-fide model for infant variants of human globoid cell leukodystrophy or Krabbe disease, were investigated. This mouse has deficient activity of GALC (beta-galactosylceramidase) that leads to a progressive accumulation of some galactosyl-sphingolipids in the brain.
A GALC genotype with one deleted and one polymorphic GALC activity-reducing allele can lead to enzymatic and clinical signs of LOGLD in the absence of marked GALC-PS deficiency.
Galactocerebrosidase (GALC) is deficient in all tissues from human patients and animal models with globoid cell leukodystrophy (GLD) or Krabbe disease.
The purification of GALC and the securing of amino acid sequence information will aid in the cloning of the GALC gene. This enzyme is deficient in human patients with Krabbe disease and several animal species.

Answer: Galactocerebrosidase is an enzyme that is deficient in Krabbe disease (also known as globoid-cell leukodystrophy). This leads to accumulation of psychosine (galactosylsphingosine) primarily in oligodendrocytes.
Exact answer: galactocerebrosidase