PURPOSE: Leukodystrophies have been defined as inherited metabolic disorders of myelin resulting in abnormal development or progressive destruction of the white matter. This study was performed to investigate the clinical manifestations and treatments of leukodystrophies in a single Korean tertiary center. METHODS: We retrospectively analysed the medical records of patients who had been diagnosed with leukodystrophy from May 1995 to May 2010 at the Asan Medical Center. RESULTS: During the 15-year study period, 36 cases of leukodystrophies were diagnosed with an verage age at symptom presentation of 49 months. Prominent symptoms at presentation were developmental delay (41%) and seizure (25%); however, nystagmus, developmental regression, hearing loss, gait disturbance, visual disturbance, attention deficit, hypotonia, hyperpigmentation, and hemiparesis were also observed. On MRI, periventricular involvement was noted frequently. The most common diagnoses were adrenoleukodystophy (25%), metachromatic leukodystrophy (11%), Krabbe disease (11%), and Pelizaeus-Merzbacher disease (8.3%). No final diagnosis was made in 14 cases (41%). Bone marrow transplantation was performed in 4 patients and showed favorable prognoses. CONCLUSION: Clinical features of leukodystrophies are not specific to diagnosis and most leukodystrophies remain undiagnosed; however, a logical algorithm based on prevalence could aid the laboratory testing. Because early detection and diagnosis is crucial for treatment and prognosis, it is important to have a high index of suspicion and watchful screening of familial history.
Adrenoleukodystrophy ; Bone Marrow Transplantation ; Canavan Disease ; European Continental Ancestry Group ; Gait ; Hearing Loss ; Humans ; Hyperpigmentation ; Leukodystrophy, Globoid Cell ; Leukodystrophy, Metachromatic ; Logic ; Mass Screening ; Medical Records ; Muscle Hypotonia ; Myelin Sheath ; Paresis ; Pelizaeus-Merzbacher Disease ; Prevalence ; Prognosis ; Retrospective Studies ; Seizures

OBJECTIVETo detect potential mutation of MLC1 gene in a child affected with megalencephalic leukoencephalopathy with subcortical cysts (MLC).

METHODSClinical symptoms of the patient were retrieved. Peripheral blood DNA samples from the patient, her parents and healthy controls were collected. Potential mutation of the MLC1 gene was detected by polymerase chain reaction and Sanger sequencing.

RESULTSThe patient presented with severe motor developmental delay and a giant skull. Magnetic resonance scan showed diffuse white matter swelling in bilateral hemispheres. DNA sequencing identified a novel homozygous c.177-c.180delC mutation of the MLC1 gene. The parents of the patient both carried a heterozygous mutation c.177-c.180delC but had a normal phenotype.

CONCLUSIONA novel MLC1 mutation c.177-c.180delC has been identified in a patient with MLC. The mutation is presumably disease-causing and has derived from parents who are both carriers.

Child, Preschool ; Cysts ; genetics ; Female ; Hereditary Central Nervous System Demyelinating Diseases ; genetics ; Humans ; Membrane Proteins ; genetics ; Mutation

No abstract available.
Leukodystrophy, Metachromatic*

Adult-onset metachromatic leukodystrophy is often a diagnostic challenge to many clinicians. It may be presented with psychiatry symptom before other evidences of leukodystrophy are uncovered. We report a 53-year-old patient who presented with 7-year history of manic-like presentation in addition to progressive neurocognitive deterioration. Diagnosis was made eventually with neuroimaging. Mutational analysis showed compound heterozygous of ARSA gene. This case demonstrated the challenge in diagnosing this condition due to its complex neuropsychiatric presentation.
Leukodystrophy, Metachromatic

Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a rare white matter disorder, first described in the early 1990s. The brain in patients with MLC appears swollen on MRI, with diffuse white matter abnormalities; in addition, there is an invariable presence of subcortical cysts, primarily in the anterior temporal region sparing the deep white matter, basal ganglia, thalami, and cerebellum. Patients with MLC present with macrocephaly and neurological abnormalities such as motor deterioration, ataxia, spasticity, and cognitive deficits. We report a twenty-month-old boy who presented with seizures and macrocephaly, delay in development, and abnormal brain MRI findings compatible with the diagnosis of MLC. The brain MRI revealed bilateral hypersignal intense subcortical white matter regions in the frontal, temporal, and parietal lobes on T2-weighted images, which were not yet associated with cystic changes. During follow-up, the frequency of seizures decreased after anticonvulsant medication was started, but the head circumference remained above the 97th percentile, and the patient continued to have developmental delay.
Ataxia ; Basal Ganglia ; Brain ; Cerebellum ; Cysts ; Developmental Disabilities ; Follow-Up Studies ; Head ; Hereditary Central Nervous System Demyelinating Diseases ; Humans ; Leukoencephalopathies ; Macrocephaly ; Muscle Spasticity ; Parietal Lobe ; Seizures

3-Hydroxy-3-methylglutaric aciduria is a rare disorder of organic acid metabolism caused by 3-hydroxy-3-methylglutaryl-coenzyme A lyase deficiency. The disorder was common in neonatal or infant period. Here a case of late onset 3-hydroxy-3-methylglutaric aciduria complicated by leucodystrophy was reported. The patient was a 7-year-old boy. He presented with progressive headache, drowsiness and vomiting. Hepatic lesions, ketosis and leucopenia were found. Symmetrical diffused leucodystrophy was shown by MRI. Blood levels of isovalerylcarnitine and acetylcarnitine increased significantly. Urinary levels of 3-hydroxy-3-methylglutaric, 3-methylglutaconic, 3-hydroxyglutaric acids and 3-methyl-crotonylglycine increased significantly. Symptoms were released by intravenous infusion of L-carnitine and glucose. After treatment for 6 months, urinary levels of 3-hydroxy-3-methylglutaric aciduria decreased in the boy and his health improved.
Acetyl-CoA C-Acetyltransferase ; deficiency ; Amino Acid Metabolism, Inborn Errors ; complications ; Child ; Hereditary Central Nervous System Demyelinating Diseases ; diagnosis ; etiology ; Humans ; Male

The clinical data of a patient with megalencephalic leukoencephalopathy (MLC) with subcortical cysts and her parents were collected. MLC1 gene mutation was detected by polymerase chain reaction and direct DNA sequencing. The patient presented with motor developmental delay and giant skull, and brain magnetic resonance imaging showed diffuse white matter swelling accompanied by subcortical cysts in bilateral frontal and parietal lobes. Gene sequencing identified two heterozygous mutations of MLC1, including missense mutation in exon 3 (c.217G>A, p.Gly73Arg) and splice site mutation in intron 9 (c.772-1G>C in IVS9-1). The patient's parents both had heterozygous mutation c.772-1G>C in IVS9-1 with normal phenotype. It can be presumed that c.772-1G>C in IVS9-1 comes from the parents, and c.217G>A (p.Gly73Arg) is a de novo mutation.
Asian Continental Ancestry Group ; genetics ; Cysts ; genetics ; Female ; Hereditary Central Nervous System Demyelinating Diseases ; genetics ; Humans ; Infant ; Membrane Proteins ; genetics ; Mutation

OBJECTIVE: To explore the clinical features and genetic variant in a child featuring megalencephalic leukoencephalopathy with subcortical cyst (MLC) type 2B. METHODS: Clinical and imaging data of the child was collected. Potential variant of hepatocyte adhesion molecule (HEPACAM) gene was detected by Sanger sequencing. The growth and development of her mother and uncle was also reviewed. RESULTS: The patient, a 1-year-and-7-month female, presented with convulsion, mental retardation and abnormally increased head circumference. Cranial MRI revealed extensive long T1 long T2 signals in the white matter of bilateral cerebral hemisphere, right anterior sac cyst, cerebral gyrus widening, and shallow sulcus. Sanger sequencing identified a c.437C>T missense variant in exon 3 of the HEPACAM gene. The same variant was detected in her mother but not father. Her mother and maternal uncle both had a history of increased head circumference when they were young. In their adulthood, the head circumference was in the normal range but still greater than the average. CONCLUSION The heterozygous variant of the HEPACAM gene probably underlies the MLC2B in this child. The variant has derived from her asymptomatic mother, which suggested incomplete penetrance of the MLC2B.
Adult ; Cell Cycle Proteins ; genetics ; Cerebrum ; diagnostic imaging ; Cysts ; diagnostic imaging ; genetics ; Female ; Genetic Variation ; Hereditary Central Nervous System Demyelinating Diseases ; diagnostic imaging ; genetics ; Humans ; Infant

Amino Acid Metabolism, Inborn Errors ; diagnosis ; genetics ; therapy ; Death, Sudden ; etiology ; Hereditary Central Nervous System Demyelinating Diseases ; diagnosis ; etiology ; Humans ; Hydroxymethylglutaryl-CoA Synthase ; deficiency ; Infant, Newborn ; Male ; Mutation ; Oxo-Acid-Lyases ; genetics ; Spectrometry, Mass, Electrospray Ionization ; Tandem Mass Spectrometry

OBJECTIVETo explore HEPACAM mutations in a Chinese family with megalencephalic leukoencephaloptathy with subcortical cysts (MLC).

METHODGenomic DNA samples were extracted from peripheral blood of the proband and her parents. All exons and exon-intron boundaries of HEPACAM and MLC1 were amplified in the MLC family by polymerase chain reaction (PCR) followed by direct DNA sequencing.

RESULTTwo heterozygous mutations of HEPACAM located in exon 2, c.203A > T(p.K68M) and c.395C > A(p.T132N), were identified in the proband. The proband's mother had the heterozygous mutations c.203A > T(p.K68M), and her father had the heterozygous mutation-c.395C > A(p.T132N). There was no variation found in MLC1 gene.

CONCLUSIONThe proband was heterozygous compound MLC patient carrying on one allele with the c.203A > T(p.K68M) mutation inherited from her mother, and the other allele with the c.395C > A(p.T132N) mutation inherited from her father. The parents both are heterozygous carriers with normal phenotype. The disease-causing gene for this family was resulted in HEPACAM mutation other than MLC1 mutation.

Asian Continental Ancestry Group ; genetics ; Base Sequence ; Child ; Cysts ; genetics ; pathology ; DNA Mutational Analysis ; Exons ; Female ; Genotype ; Hereditary Central Nervous System Demyelinating Diseases ; genetics ; pathology ; Heterozygote ; Humans ; Membrane Proteins ; genetics ; Mutation ; Pedigree ; Phenotype ; Proteins ; genetics