GJA12 mutations in children with recessive hypomyelinating leukoencephalopathy
| Autor: | Graziella Uziel, Isabella Moroni, Marianna Bugiani, Massimo Zeviani, M. R. Balestrini, Eman Bakhsh, Eleonora Lamantea, Alberto Bizzi, S. Al Shahwan |
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| Rok vydání: | 2006 |
| Předmět: |
Male
Pelizaeus Merzbacher like disease Internationality Adolescent Pelizaeus-Merzbacher Disease Saudi Arabia Disease Comorbidity medicine.disease_cause Risk Assessment Child Child Preschool Dementia Vascular Female Genetic Predisposition to Disease Hereditary Central Nervous System Demyelinating Diseases Humans Italy Pakistan Pedigree Risk Factors GJC2 Autosomal recessive trait Vascular medicine Missense mutation Dementia Preschool Genetics Mutation Cerebellar ataxia business.industry medicine.disease Neurology (clinical) medicine.symptom business |
| Zdroj: | Neurology. 67(2) |
| ISSN: | 1526-632X |
| Popis: | Background: Pelizaeus-Merzbacher-like disease (PMLD) is an inherited hypomyelinating leukoencephalopathy with onset in early infancy. Like Pelizaeus-Merzbacher disease (PMD), PMLD is characterized clinically by nystagmus, cerebellar ataxia, and spasticity, due to a permanent lack of myelin deposition in the brain. Mutations in the GJA12 gene, encoding connexin 47 (Cx47), were recently reported in five children with autosomal recessive PMLD. Objectives: To evaluate the impact of mutations in the GJA12 gene in, and define the clinical and neuroimaging features of, autosomal recessive PMLD. Results: The authors screened for GJA12 mutations in 10 additional PMLD families originating from Italy, Pakistan, and Saudi Arabia. Three novel homozygous GJA12 mutations were identified in 12 mutant cases distributed in 3 of 10 families. The mutations segregated with the disease according to an autosomal recessive trait and included one missense (G236S) and two nonsense (L281fs285X and P131fs144X) changes. Conclusions: The identification of homozygous mutations predicting the synthesis of aberrant and truncated polypeptides, and their tight segregation with the disease in very large families, clearly demonstrate that the loss of Cx47 function is the cause of the disease. The phenotype of GJA12 -related Pelizaeus-Merzbacher-like disease is fairly homogeneous and similar to that of Pelizaeus-Merzbacher disease. However, slower progression of symptoms, greater preservation of cognitive functions, and partial myelination of corticospinal tracts at MRI were distinctive features, which could help in the differential diagnosis. |
| Databáze: | OpenAIRE |
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