FMR1-AS1 and fragile X syndrome: Furthermore, lncRNA FMR4 originating from Fragile X mental retardation 1 (FMR1) locus, which aberrant expansion causes autism [76], was able to improve hNPCs development, furthermore, dysregulation of FMR4 contributed to the pathophysiology Fragile X syndrome and/or Fragile X tremor/ataxia syndrome [77].