Disease Repeated Sequence Normal Range Disease Range
Spinal and bulbar muscular atrophy CAG 11-33       40-62
Fragile-X syndrome CGG   6-54  50-1500
Jacobsen syndrome CGG       11 100-1000
Spinocerebellar ataxia (several types) CAG   4-44     21-130
Autosomal dominant cerebellar ataxia CAG   7-19     37-220
Myotonic dystrophy CTG   5-37  44-3000
Huntington disease CAG   9-37     37-121
Friedreich ataxia GAA   6-29  200-900
Dentatorubral-pallidoluysian atrophy CAG   7-25       49-75
Myoclonus epilepsy of the Unverricht-Lundborg type CCCCGCCCCGCG    2-3       12-13
Table 18.1: Examples of human genetic diseases caused by expanding nucleotide repeats