FMR1 and neuronal intranuclear inclusion disease: Similar to FXTAS (GGC repeats in the FMR1 gene), Huntington’s disease (CAG repeats in the HTT gene), amyotrophic lateral sclerosis/FTD (GGGGCC repeats in the C9ORF72 gene), and myotonic dystrophy (DM1, CUG repeats in the DMPK gene), NIID is one kind of nucleotide repeat expansion disorder or microsatellite repeat expansion disorder with expanded GGC repeats in the NOTCH2NLC gene.