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Leading the way in the nervous system: Lipid Droplets as new players in health ...

Teixeira, V; Maciel, P; Costa, V

Lipid droplets (LDs) are ubiquitous fat storage organelles composed of a neutral lipid core, comprising triacylglycerols (TAG) and sterol esters (SEs), surrounded by a phospholipid monolayer membrane with several decorating proteins. Recently, LD biology has come to the foreground of research due to their importance for energy homeostasis and cellular stress response. As aberrant LD accumulation and lipid deple...


The Role of AKT3 Copy Number Changes in Brain Abnormalities and Neurodevelopmen...

Lopes, F; Torres, F; Soares, G; van Karnebeek, CD; Martins, C; Antunes, D; Silva, J; Muttucomaroe, L; Botelho, LF; Sousa, S; Rendeiro, P; Tavares, P

Microdeletions at 1q43-q44 have been described as resulting in a clinically recognizable phenotype of intellectual disability (ID), facial dysmorphisms and microcephaly (MIC). In contrast, the reciprocal microduplications of 1q43-q44 region have been less frequently reported and patients showed a variable phenotype, including macrocephaly. Reports of a large number of patients with copy number variations involv...


Genomic imbalances defining novel intellectual disability associated loci

Lopes, F; Torres, F; Soares, G; Barbosa, M; Silva, J; Duque, F; Rocha, M; Sá, J; Oliveira, G; Sá, MJ; Temudo, T; Sousa, S; Marques, C; Lopes, S

Background: High resolution genome-wide copy number analysis, routinely used in clinical diagnosis for several years, retrieves new and extremely rare copy number variations (CNVs) that provide novel candidate genes contributing to disease etiology. The aim of this work was to identify novel genetic causes of neurodevelopmental disease, inferred from CNVs detected by array comparative hybridization (aCGH), in a...


Whole Gene Deletion of EBF3 Supporting Haploinsufficiency of This Gene as a Mec...

Lopes, F; Soares, G; Gonçalves-Rocha, M; Pinto-Basto, JM; Maciel, P

Mutations in early B cell factor 3 (EBF3) were recently described in patients with a neurodevelopmental disorder (NDD) that includes developmental delay/intellectual disability, ataxia, hypotonia, speech impairment, strabismus, genitourinary abnormalities, and mild facial dysmorphisms. Several large 10q terminal and interstitial deletions affecting many genes and including EBF3 have been described in the litera...


Variant Rett Syndrome in a Girl with a Pericentric X-Chromosome Inversion Leadi...

Vieira, JP; Lopes, F; Silva-Fernandes, A; Sousa, MV; Moura, S; Sousa, S; Costa, BM; Barbosa, M; Ylstra, B; Temudo, T; Lourenço, T; Maciel, P

Rett syndrome is a neurodevelopmental disorder caused by mutations in the MECP2 gene. We investigated the genetic basis of disease in a female patient with a Rett-like clinical. Karyotype analysis revealed a pericentric inversion in the X chromosome -46,X,inv(X)(p22.1q28), with breakpoints in the cytobands where the MECP2 and CDKL5 genes are located. FISH analysis revealed that the MECP2 gene is not dislocated ...


The rs5743836 polymorphism in TLR9 confers a population-based increased risk of...

Carvalho, A; Cunha, C; Almeida, AJ; Osório, NS; Saraiva, M; Teixeira-Coelho, M; Pedreiro, S; Torrado, E; Domingues, N; Gomes-Alves, AG; Marques, A

Non-Hodgkin lymphoma (NHL) has been associated with immunological defects, chronic inflammatory and autoimmune conditions. Given the link between immune dysfunction and NHL, genetic variants in toll-like receptors (TLRs) have been regarded as potential predictive factors of susceptibility to NHL. Adequate anti-tumoral responses are known to depend on TLR9 function, such that the use of its synthetic ligand is b...


Rett Syndrome With and Without Detected MECP2 Mutations: an Attempt to Redefine...

Temudo, T; Santos, M; Ramos, E; Dias, K; Vieira, JP; Moreira, A; Calado, E; Carrilho, I; Oliveira, G; Levy, A; Barbot, C; Fonseca, M; Cabral, A

Background: The diagnosis of Rett syndrome (RTT) is based on a set of clinical criteria, irrespective of mutation status. The aims of this study were (1) to define the clinical differences existing between patients with Rett syndrome with (Group I) and without a MECP2 mutation (Group II), and (2) to characterize the phenotypes associated with the more common MECP2 mutations. Patients and Methods: We analyzed 87...


Motor uncoordination and neuropathology in a transgenic mouse model of Machado-...

Silva-Fernandes, A; Costa, MC; Duarte-Silva, S; Oliveira, P; Botelho, C; Martins, L; Mariz, J; Ferreira, T; Ribeiro, F; Correia-Neves, M; Costa, C

Machado-Joseph disease (MJD) is a late-onset neurodegenerative disorder caused by a polyglutamine (polyQ) expansion in the ataxin-3 protein. We generated two transgenic mouse lineages expressing the expanded human ataxin-3 under the control of the CMV promoter: CMVMJD83 and CMVMJD94, carrying Q83 and Q94 stretches, respectively. Behavioral analysis revealed that the CMVMJD94 transgenic mice developed motor unco...


Evaluation of CSF Neurotransmitters and Folate in 25 Patients with Rett Disorde...

Temudo, T; Rios, M; Prior, C; Carrilho, I; Santos, M; Maciel, P; Sequeiros, J; Fonseca, M; Monteiro, J; Cabral, P; Vieira, JP; Ormazabal, A; Artuch, R

Background: Rett disorder (RD) is a progressive neurodevelopmental entity caused by mutations in the MECP2 gene. It has been postulated that there are alterations in the levels of certain neurotransmitters and folate in the pathogenesis of this disease. Here we re-evaluated this hypothesis. Patients and Methods: We evaluated CSF folate, biogenic amines and pterines in 25 RD patients. Treatment with oral folinic...


Mutations in the MECP2 Gene Are Not a Major Cause of Rett Syndrome-Like or Rela...

Santos, M; Temudo, T; Kay, T; Carrilho, I; Medeira, A; Cabral, H; Gomes, R; Lourenço, T; Venâncio, M; Calado, E; Moreira, A; Oliveira, G; Maciel, P

Rett syndrome is a genetic neurodevelopmental disorder that affects mainly girls, but mutations in the causative MECP2 gene have also been identified in boys with classic Rett syndrome and Rett syndrome-like phenotypes. We have studied a group of 28 boys with a neurodevelopmental disorder, 13 of which with a Rett syndrome-like phenotype; the patients had diverse clinical presentations that included perturbation...


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