Overview Disease Nucleotide Repeat Gene affected Chromosome Fragile X syndrome CGG FMR1 Sex X chromosome Friedrich ataxia GAA FXN 9 Huntington's disease CAG HTT 4 Myotonic dystrophy - type 1 CTG DMPK 19 Fragile X Syndrome Inheritance pattern login to view 1 more bullet Repeat expansion login to view 1 more bullet Presentation login to view 5 more bullets Friedrich's Ataxia Inheritance pattern login to view 1 more bullet Repeat expansion login to view 4 more bullets Presentation login to view 9 more bullets Huntington's Disease Inheritance pattern login to view 1 more bullet Repeat expansion login to view 1 more bullet Presentation login to view 10 more bullets mnemonic login to view 1 more bullet Myotonic Dystrophy - Type 1 Inheritance pattern login to view 1 more bullet Repeat expansion login to view 3 more bullets Presentation login to view 7 more bullets