Alu elements are known to be the source of microsatellite repeats responsible for two other repeat expansion disorders: Friedreich ataxia and spinocerebellar ataxia type 10.
This approach also worked for (GAA)n.(TTC)n, (CCTG)n-(CAGG)n, and (ATTCT)n.(AGAAT)n tracts associated with Friedreich ataxia, DM2, and spinocerebellar ataxia type 10, respectively.