title: Rapidly progressive frontotemporal dementia and bulbar amyotrophic lateral sclerosis in Portuguese patients with C9orf72 mutation.
abstract: Amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD) form a spectrum of clinically, pathologically, and genetically overlapping disorders, as confirmed by the recent report that it can be caused by a hexanucleotide repeat expansion in C9orf72. One hundred and fourteen Portuguese cases diagnosed as probable or possible familial FTLD, as part of the EOD consortium study, and nine further Portuguese cases with familial ALS were tested for the presence of this mutation. Results showed that six Portuguese patients from unrelated families had the mutation, five (4.4%) patients from the FTLD group and one (11.1%) from the ALS sample. Of these, three patients had FTLD and rapidly progressive bulbar ALS. Electromyography confirmed diffuse loss of motor units with marked bulbar involvement. In conclusion, the cases now reported showed a very rapid progression, suggesting bulbar ALS could be particularly common and aggressive in patients with the C9orf72 hexanucleotide repeat expansion, in the Portuguese population.
authors: Faculty of Medicine and Instituto de Medicina Molecular, University of Lisbon, Portugal.
authors: Catarina
authors: C
authors: Chester
authors: Mamede
authors: M
authors: de Carvalho
authors: Gabriel
authors: G
authors: Miltenberger
authors: Sónia
authors: S
authors: Pereira
authors: Lubina
authors: L
authors: Dillen
authors: Julie
authors: J
authors: van der Zee
authors: Christine
authors: C
authors: van Broeckhoven
authors: Alexandre
authors: A
authors: de Mendonça
mesh_terms: D000328:Adult; D000690:Amyotrophic Lateral Sclerosis / Q000175:diagnosis* / Q000235:genetics*; D005260:Female; D057180:Frontotemporal Dementia / Q000175:diagnosis* / Q000235:genetics*; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005820:Genetic Testing; D006801:Humans; D008297:Male; D008875:Middle Aged; D020966:Muscular Disorders, Atrophic / Q000175:diagnosis* / Q000235:genetics*; D009154:Mutation / Q000235:genetics; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D011174:Portugal