RFC1 and neuronal intranuclear inclusion disease: Most of the repeat expansion disorders listed in Table 1 have been discussed extensively in literature, however, in the last three years, 12 novel neurological repeat expansion disorders have been classified – these include SCA37, CANVAS, neuronal intranuclear inclusion disease (NIID), OPML, OPDM, OPDM2, FAME1, FAME2, FAME3, FAME6, FAME7 and recessive hereditary motor neuropathy (HMN) (Table 1).