<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Krabbe disease is an autosomal recessive neurodegenerative disorder due to a defect of the lysosomal enzyme β-galactocerebrosidase (β-GALC). Depending on the age of onset, the disease is classified into infantile and later-onset forms. We report neuroradiological, neurophysiological and molecular findings in two Greek patients with the infantile form of Krabbe disease. The index patients presented at the age of 3.5 and 6 months, respectively, due to developmental delay. Magnetic resonance imaging (MRI) of the first patient’s brain demonstrated signs of leukodystrophy, while nerve conduction velocities (NCVs) were significantly decreased. The second patient’s MRI at the age of 4 months was initially normal, but at 18 months demonstrated leukodystrophic alterations as well, whereas NCVs were also significantly delayed. In both patients, a severe decrease in β-GALC, activity supported the diagnosis of Krabbe disease, while the final diagnosis was confirmed by molecular genetic testing. Two homozygous mutations of the <italic>GALC</italic> gene, the c.411_413delTAA [p.K139del] mutation in the first patient, and the c.749T>C [p.I250T] mutation in the second patient, were identified. At their last follow-up visit at the age of 4 and 6 years, respectively, both patients were bedridden and quadri-plegic, suffering from frequent respiratory tract infections and fed through a gastrostomy. Both mutations found in homozygosity in these two unrelated patients of Greek ancestry, could pinpoint a common origin. Genotyping of patients with Krabbe disease is important, in order to contribute to the creation of a European mutation database and to further study possible genotype-phenotype correlations of the disease.</p></abstract>

Krabbe disease is an autosomal recessive neurodegenerative disorder due to a defect of the lysosomal enzyme β-galactocerebrosidase (β-GALC). Depending on the age of onset, the disease is classified into infantile and later-onset forms. We report neuroradiological, neurophysiological and molecular findings in two Greek patients with the infantile form of Krabbe disease. The index patients presented at the age of 3.5 and 6 months, respectively, due to developmental delay. Magnetic resonance imaging (MRI) of the first patient’s brain demonstrated signs of leukodystrophy, while nerve conduction velocities (NCVs) were significantly decreased. The second patient’s MRI at the age of 4 months was initially normal, but at 18 months demonstrated leukodystrophic alterations as well, whereas NCVs were also significantly delayed. In both patients, a severe decrease in β-GALC, activity supported the diagnosis of Krabbe disease, while the final diagnosis was confirmed by molecular genetic testing. Two homozygous mutations of the GALC gene, the c.411_413delTAA [p.K139del] mutation in the first patient, and the c.749T>C [p.I250T] mutation in the second patient, were identified. At their last follow-up visit at the age of 4 and 6 years, respectively, both patients were bedridden and quadri-plegic, suffering from frequent respiratory tract infections and fed through a gastrostomy. Both mutations found in homozygosity in these two unrelated patients of Greek ancestry, could pinpoint a common origin. Genotyping of patients with Krabbe disease is important, in order to contribute to the creation of a European mutation database and to further study possible genotype-phenotype correlations of the disease.

Neuroradiological, neurophysiological and molecular findings in infantile Krabbe disease: two case reports

1 Pediatric Clinic, Aristotle University of Thessaloniki, Thessaloniki,

Department of Enzymology and Cellular Function, Institute of Child Health, Athens,

Department of Radiology, Hippokratio General Hospital, Thessaloniki,

Neurogenetics and Metabolic Disorders Unit, University of Rostock, Rostock,

Balkan Journal of Medical Genetics

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Krabbe disease is an autosomal recessive neurodegenerative disorder due to a defect of the lysosomal enzyme β-galactocerebrosidase (β-GALC). Depending on the...

		Nerve Conduction Velocities (m/s)
	Age When Examined	MedianNerve	UlnarNerve	TibialNerve	PeronealNerve	SuralNerve
Patient 1	4 months	28.2	25.0	21.4	18.7	33.2
Normal values for 1-6 months		33.3	35.0	35.0	38.8	40.6
Patient 2	18 months	30.2	31.8	29.2	34.6	29.4
Normal values for 1-2 years		53.6	52.2	50.2	51.4	53.0

Neuroradiological, neurophysiological and molecular findings in infantile Krabbe disease: two case reports

Article Category: Case Report

Publié en ligne: 02 août 2016

Pages: 85 - 90

DOI: https://doi.org/10.1515/bjmg-2016-0011

Mots clés
β-galactocerebrosidase (β-GALC), gene, Krabbe disease, Leukodystrophy, Mutation, Nerve conduction velocity (NCV)

© 2016 Walter de Gruyter GmbH, Berlin/Boston

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Nerve conduction velocities in both patients.

Neuroradiological, neurophysiological and molecular findings in infantile Krabbe disease: two case reports

Article Category: Case Report

Publié en ligne: 02 août 2016

Pages: 85 - 90

DOI: https://doi.org/10.1515/bjmg-2016-0011

Mots clésβ-galactocerebrosidase (β-GALC), gene, Krabbe disease, Leukodystrophy, Mutation, Nerve conduction velocity (NCV)

© 2016 Walter de Gruyter GmbH, Berlin/Boston

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Nerve conduction velocities in both patients.

Mots clés
β-galactocerebrosidase (β-GALC), gene, Krabbe disease, Leukodystrophy, Mutation, Nerve conduction velocity (NCV)