Mazut Also, it is worth mentioning that SPG2 affected males can reproduce, while there are no reports of PMD affected males who have descendants 9. Note that patients are cited on the tables with their assigned pedigree numbers. Pelizaeus Merzbacher Disease PMD is a chronic pediatric leukoencephalopathy caused by disorders of the axonal myelination and the myelin metabolism in the oligodendrocytes, reported for the first time on by doctor Friedrich Pelizaeus 1 and revisited on by Ludwig Merzbacher 2. Patients lacking the major CNS myelin protein, proteolipid protein 1, develop length-dependent axonal degeneration in the absence of demyelination and inflammation.
|Published (Last):||21 April 2017|
|PDF File Size:||1.6 Mb|
|ePub File Size:||2.32 Mb|
|Price:||Free* [*Free Regsitration Required]|
Tauzil Because of this, it is a priority for the clinical specialists and treating physicians to improve the diagnosis algorithms in order to shorten time before establishment of the specific therapeutic plan and the appropriate genetic counseling for the families. Most of mutations detected on individuals diagnosed with SPG2 are missense 8.
Verbal language is limited, but patients understand simple orders and can follow them. Proc Nat Acad Sci. Seven individuals ages 6 months to 16 years 4 probands, 3 male relatives of the probandsdiagnosed clinically, paraclinically and molecularly as Pelizaeus Merzbacher patients, attended in different medical care centers in Colombia Fig. Laboratory endpoints are shown in Table 2. Z Ges Neurol Psychiatr. PLP1-related inherited dysmyelinating disorders Pelizaeus-Merzbacher disease and spastic paraplegia type 2.
Molecular Analysis and Results: Estudios Moleculares y Resultados: Other encephalic structures such as the brainstem, basal nuclei and cerebellum showed no abnormalities. Diagnosis can be mistaken primarily with SPG2, also caused by mutations on the PLP1 gene, differing on signs such as autonomic dysfunction and characteristic paraplegia.
Mean age at diagnosis was 5 years 5 months, being classic PMD most frequently diagnosed, in five cases, whereas the connatal phenotype was only present in two of the patients, Neuroimaging of patients with classic PMD showed evidence of T2 hyperintensities both diffuse or periventricular in the supratentorial withe matter. We believe it is important to establish the biochemical functionality of I47 position on the myelin proteolipidic protein to evaluate its impact on the connatal phenotype of PMD disease, given that there are not functional studies to this date that prove in vitro or in vivo effects.
Severe compromise of physiological tresholds. Exon 1 only transcribes the start codon, while exons 2, 3, 4, and 5 encode the hydrophobic domains and the hydrophilic chains of the protein. All cases had abnormalities in neuroimages. Orphanet J Rare Dis.
Patients can also have nystagmus, optic atrophy, dysarthria, ataxic features and variable range of intellectual disability; however, symptoms appear to be less compromising tan those presenting in classic Abreviwda. Neuroradiologic correlates of clinical disability and progression in the X-Linked leukodystrophy Pelizaeus-Merzbacher disease.
Clinical and mutational spectrum of Colombian patients with Pelizaeus Merzbacher Disease Its genetic aetiology can be either a duplication or other gene dosage alterations or a punctual mutation at the PLP1 locus. Although clinical manifestations are heterogeneous 56the most esacla neurological signs are nistagmus, developmental delay, spasticity, along with neuroimaging supporting aberrant myelination of the Central Nervous System CNS compromising primarily xel periventricular white matter, with a tigroid striation pattern that responds to the conservation of myelinated islets, and also an alteration of the N-acetyl aspartate and choline profiles on the brain magnetic resonance spectroscopy Pelizaeus Merzbacher Disease PMD is an X-linked developmental defect of myelination that causes a childhood chronic spastic encephalopathy.
Magnetic resonance imaging and spectroscopic analysis in 5 cases of Pelizaeus-Merzbacher disease metabolic abnormalities as diagnostic tools. Results from the paraclinical evaluation of patients with Pelizaeus Merzbacher Disease. Both patients with the connatal form of the disease had severe disability scores and poor vital prognosis, despite having the chance of an earlier diagnosis.
Case series presentation Seven individuals ages 6 months to 16 years 4 probands, 3 male relatives of the probandsdiagnosed clinically, paraclinically and molecularly as Pelizaeus Merzbacher patients, attended in different medical care centers in Colombia Fig. Pelizaeus-Merzbacher disease clinical and nosological study.
A wide range of mutations in PLP1 has been described, recurrently detecting a whole gene duplication as the most frequent alteration PV posterosuperior white matter unnicef signal on T2. Only three patients were able to achieve gait, though altered. Also, it is worth mentioning that SPG2 affected males can reproduce, while there are no reports of PMD affected males who have descendants 9.
Patients suffering from a connatal form of PMD, the most severe phenotype, have histopathological studies revealing complete absence of myelination in the brain, explaining the sel clinical deterioration and suggesting tan death of this patients may respond to nervous conduction alterations in brain control centers. In general, PLP1 gene duplications result in a classical form of PMD, nonsense mutations in either form of SPG2 and connatal unifef of PMD, and other monoallelic mutations have been related to less circumscribed clinical phenotypes 6.
We present one of the first Latin-American series of patients with clinical diagnosis and molecular confirmation of Pelizaeus Merzbacher disease, being the classical form more frequent than the connatal form in the evaluated patients. Mutations in noncoding regions of the proteolipid protein gene in Pelizaeus-Merzbacher disease.
The proteolipid protein gene and myelin disorders in man and dle models. Etapa sensomotriz by on Prezi It is worth saying that all patients exhibited some level of speech delay or learning difficulties, and that only two were going to school. Boulloche J, Aicardi J. Hobson GM, Kamholz J. Survival rates in this patients have been described to be up to the seventh decade of life. Related Posts
Escalas de Evaluación
Seleccin de las reas 9 2. Criterios para la seleccin de los indicadores 9 3. Area: Motricidad gruesa A 18 4. Area: Motricidad fino-adaptativa B 23 4. Area de audicin y lenguaje C 29 4. Area personal social D 35 Escala Abreviada del desarrollo EAD-1 41 ANEXO Tablas de normas para la poblacin colombiana 47 Escala Abreviada de Desarrollo Ministerio de Salud Nelson Ortiz Noviembre 3 Sin lugar a dudas, el disponer de instrumentos confiables, adaptados y normalizados a la cultura regional, ha sido una de las necesidades ms sentidas por los diversos profesionales involucrados en la evaluacin y diagnstico del desarrollo infantil.
Escala Abreviada Del Desarrollo
Employment at UNICEF
Docencia e Investigación Bonaventuriana