FMR1 and cerebellar ataxia: Furthermore, a case report of a disease correlating with the abnormal expansion of CGG repeats between 55 and 200 in the fragile X retardation 1 (FMR1) gene called fragile X-associated tremor/ataxia syndrome showed that tissues with less methylated repeats and elevated expression of FMR1 had increased CGG repeats (Field et al., 2019).