5 documents found, page 1 of 1
Novel candidate blood-based transcriptional biomarkers of Machado-Joseph disease
Raposo, Mafalda; Bettencourt, Conceição; Maciel, P.; Gao, Fuying; Ramos, Amanda; Kazachkova, Nadiya; Vasconcelos, João; Kay, Teresa; Rodrigues, Ana JoãoBACKGROUND: Machado-Joseph disease (or spinocerebellar ataxia type 3) is a late-onset polyglutamine neurodegenerative disorder caused by a mutation in the ATXN3 gene, which encodes for the ubiquitously expressed protein ataxin-3. Previous studies on cell and animal models have suggested that mutated ataxin-3 is involved in transcriptional dysregulation. Starting with a whole-transcriptome profiling of periphera...
Differential mtDNA damage patterns in a transgenic mouse model of Machado-Josep...
Ramos, Amanda; Kazachkova, Nadiya; Silva, Francisca; Maciel, P.; Fernandes, Anabela Silva; Silva, Sara Carina Duarte; Santos, Cristina; Lima, ManuelaMitochondrial dysfunction has been associated with late onset neurodegenerative disorders, among which is Machado-Joseph disease (MJD/SCA3). In a previous study, using a transgenic mouse model of MJD, we reported a decrease in mitochondrial DNA (mtDNA) copy number and an accumulation of the 3876-bp deletion with age and with phenotype development. We extended this study by analyzing the pattern of mtDNA depleti...
Patterns of mitochondrial DNA damage in blood and brain tissues of a transgenic...
Kazachkova, Nadiya; Raposo, Mafalda; Montiel, Rafael; Cymbron, Teresa; Bettencourt, Conceição; Fernandes, Anabela Silva; Silva, Sara Carina DuarteBACKGROUND: Machado-Joseph disease (MJD) is an autosomal dominant spinocerebellar ataxia caused by a CAG tract expansions in the ATXN3 gene. Patterns of mitochondrial damage associated with pathological findings of brain tissues could provide molecular biomarkers of this disorder. OBJECTIVE: The potential of mitochondrial DNA (mtDNA) damage as a biomarker of MJD progression was investigated using a transgenic m...
Sequence analysis of 5' regulatory regions of the Machado-Joseph Disease gene (...
Bettencourt, C.; Raposo, Mafalda; Kazachkova, Nadiya; Santos, Cristina; Kay, Teresa; Vasconcelos, João; Maciel, P.; Donis, KarinaMachado–Joseph disease (MJD) is a late-onset autosomal dominant neurodegenerative disorder, which is caused by a coding (CAG)n expansion in the ATXN3 gene (14q32.1). The number of CAG repeats in the expanded alleles accounts only for 50 to 75 % of onset variance, the remaining variation being dependent on other factors. Differential allelic expression of ATXN3 could contribute to the explanation of different ag...
The APOE ε2 allele increases the risk of Earlier Age at onset in Machado-Joseph...
Bettencourt, C.; Raposo, Mafalda; Kazachkova, Nadiya; Cymbron, Teresa; Santos, Cristina; Kay, Teresa; Vasconcelos, João; Maciel, P.; Donis, KarinaBackground. Machado-Joseph disease (MJD) is an autosomal dominant neurodegenerative disorder of late onset, caused by a (CAG)n expansion at the ATXN3 gene (14q32.1). Variation in age-at-onset is partially explained by the size of the (CAG)n tract in expanded alleles. The remaining variation should be the product of other factors, namely modifier genes. The genotype at the APOE locus has been described as a poss...