P. T201NfsX11 Thr201AsnfsTer11 c.601insA Maspardin-ACP33-SPG21 is mutated in Mast syndrome (Cross and McKusick 1967, Simpson et al 2003); In an Ohio Amish isolate, Cross and McKusick (1967) found 20 cases of a recessively inherited form of presenile dementia, which they termed Mast syndrome rs387906275