RESUMO
This work is aimed at describing the proceedings and parameters used to validate PowerPlex® Fusion 6C System, the polymerase chain reaction (PCR) amplification kit by Promega, for posterior implementation in the laboratorial routine of the Forensic Genetic Service. The PowerPlex® Fusion 6C System allows multiplex PCR, through simultaneous amplification and posterior detection by fluorescence of 27 loci. Characterization of the kit was made according to the laboratory's internal validation procedure based on validation guidelines from Scientific Working Group on DNA Analysis Methods. Some parameters were evaluated, such as specificity, analytical thresholds, sensitivity, precision, mixture studies, DNA control samples, a proficiency test and changes in the PCR-based procedures: final reaction volume and cycle number, changes in the reaction mixture for direct amplification. This kit proved to be very robust and the results are in concordance with previous developmental validation by the manufacturer. In some parameters, the results were better than expected.
RESUMO
A displasia diafisária progressiva ou doença de Camurati-Engelmann é uma doença rara, caracterizada por dor e fraqueza muscular dos membros afetados e espessamento progressivo da cortical diafisária dos ossos longos. Os autores descrevem o caso clínico de um doente com manifestações iniciais da doença na infância, mas cujo diagnóstico só foi estabelecido durante a idade adulta, depois de evoluída a doença e após surgirem as mesmas manifestações em um dos filhos. Salienta-se a dificuldade no diagnóstico e a relevância do diagnóstico diferencial com outras doenças que cursam com osteoesclerose e/ou hiperostose. Na literatura é rara a descrição da sua evolução ao longo dos anos.
Camurati-Engelmann Disease or progressive diaphyseal dysplasia is a rare disease, characterized by limb pain and muscular weakness, and cortical thickening of the diaphyses of long bones. The authors report a case of a male patient with manifestations since his childhood, whose diagnosis was established later on, when he was an adult, with the disease already progressed, and when the same manifestations began in one of his sons. The importance of the differential diagnosis regarding other diseases concurrent with osteosclerotic and/or hyperostotic changes is emphasized here. Description of its evolution along the years is rarely found in the literature.
