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
Mast syndrome is an autosomal recessive, complicated form of hereditary spastic paraplegia with dementia that is present at high frequency among the Old Order Amish. Subtle childhood abnormalities may be present, but the main features develop in early adulthood. The disease is slowly progressive, and cerebellar and extrapyramidal signs are also found in patients with advanced disease. Patients have a thin corpus callosum and white-matter abnormalities, as seen on magnetic resonance imaging. Using an extensive Amish pedigree, we have mapped the Mast syndrome locus (SPG21) to a small interval of chromosome 15q22.31 that encompasses just three genes. Sequence analysis of the three transcripts revealed that all 14 affected cases were homozygous for a single base-pair insertion (601insA) in the acid-cluster protein of 33 kDa (ACP33) gene. This frameshift results in the premature termination (fs201-212X213) of the encoded product, which is designated "maspardin" (Mast syndrome, spastic paraplegia, autosomal recessive with dementia), and has been shown elsewhere to localize to intracellular endosomal/trans-Golgi transportation vesicles and may function in protein transport and sorting.
Title: The mast syndrome. A recessively inherited form of presenile dementia with motor disturbances Cross HE, McKusick VA Ref: Archives of Neurology, 16:1, 1967 : PubMed
