Machado–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...
Background. 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...
A síndrome de Ehlers-Danlos é uma entidade clínica caracterizada por hipermobilidade articular, lassidão e fragilidade cutânea resultante de alterações do tecido conjuntivo. São descritos seis tipos principais, com base em dados clínicos, no modo de transmissão hereditária e alterações bioquímicas e moleculares subjacentes. Os autores apresentam um caso clínico referente a uma doente do sexo feminino, de 44 ano...
We determined the Y-chromosomal composition of the population of the Azores Islands (Portugal), by analyzing 20 binary polymorphisms located in the non-recombining portion of the Y-chromosome (NRY), in 185 unrelated individuals from the three groups of islands forming the Archipelago (Eastern, Central and Western). Similar to that described for other Portuguese samples, the most frequent haplogroups were R1(xR1...
To gain insights on the molecular mechanisms of mutation that led to the emergence of expanded alleles in the MJD gene, by studying the behavior of wild-type alleles and testing the association of its distribution with the representation of the disease. Methods: The number of CAG motifs in the MJD gene was determined in a representative sample of 1000 unrelated individuals. Associations between the repeat size ...
Através da aplicação de implantes de melatonina é possível simular a estação mais favorável à reprodução nos ovinos que é o Outono. Neste trabalho aplicaram-se 3 implantes desta hormona a machos de raça Merina Preta (GPT, n=6) e de raça Campaniça (GCT, n=7), mantendo-se um grupo de raça Merina Preta sem qualquer tratamento (GPC, n=6). Sémen recolhido aos carneiros foi avaliado pelas provas de mobilidade individ...
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