Intermediate Repeat Expansion in the Gene as a Risk Factor in the ALS and FTD Spanish Population.

Intermediate CAG expansions in the gene ataxin-2 () are a known risk factor for ALS, but little is known about their role in FTD risk. Moreover, their contribution to the risk and phenotype of patients might vary in populations with different genetic backgrounds. The aim of this study was to assess the relationship of intermediate CAG expansions in with the risk and phenotype of ALS and FTD in the Spanish population.