The FMR1 premutation has been linked to other disorders such as a late-onset neurodegenerative syndrome, fragile X-associated tremor/ataxia syndrome (FXTAS), fragile X-associated neuropsychiatric disorder (FXAND), and fragile X-associated primary ovarian insufficiency (FXPOI) (6). Here, PSMB5 is linked to fragile X-associated tremor/ataxia syndrome.