Cognitive and behavioral manifestations of the C9orf72 mutation in Amyotrophic Lateral Sclerosis: an age, education, and gender-matched cohort study.
OBJECTIVES The presence of a hexanucleotide expansion in the gene C9orf72 confers a higher risk of developing ALS and FTD with associated cognitive and behavioral change, although penetrance is incomplete, and many gene carriers never exhibit any clinical signs during their lifetime. To date, there have been few studie...