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New variants, challenges and pitfalls in DMD genotyping: implications in diagnosis, prognosis and therapy

Title
New variants, challenges and pitfalls in DMD genotyping: implications in diagnosis, prognosis and therapy
Type
Article in International Scientific Journal
Year
2014
Authors
Santos, R
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Goncalves, A
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Oliveira, J
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Vieira, E
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Vieira, JP
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Evangelista, T
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Moreno, T
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Santos, M
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Fineza, I
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Bronze da Rocha, E
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Journal
Vol. 59
Pages: 454-464
ISSN: 1434-5161
Publisher: Springer Nature
Other information
Authenticus ID: P-009-YMW
Abstract (EN): Molecular characterization of patients with Duchenne or Becker muscular dystrophies is essential for establishing a differential diagnosis, allowing appropriate clinical follow-up, patient management and genetic counseling. In light of the recent mutation-based therapeutic approaches, DMD gene analysis has gained further relevance. Owing to the size and complexity of the DMD gene and the diversity of mutation types, molecular analysis is not always a straightforward task requiring the combination of several methodologies. Our national genetic diagnostic service genetically characterized 308 dystrophinopathy patients (284 unrelated families), leading to the identification of 175 distinct mutations, including 39 unpublished variants. These studies revealed several potential diagnostic pitfalls (because of technical limitations or related with DMD's genetic heterogeneity) that may be overlooked even considering the international disease-specific diagnostic guidelines. Comprehensive analysis involved expression studies at the mRNA level, the identification of splicing changes and ultimately providing evidence for apparent exceptions to the reading-frame rule. Besides increasing the mutation detection rate, this detailed molecular characterization is indispensable for the identification of suitable candidates for the new mutation-centered therapies. As patient registries are internationally recognized as essential for clinical trial recruitment, this led us to develop the Portuguese Duchenne and Becker Muscular Dystrophy registry in collaboration with the Translational Research in Europe-Assessment and Treatment of Neuromuscular Diseases network.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 11
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