How does Fragile X - associated tremor/ataxia syndrome (FXTAS) differ from Fragile X syndrome (FXS)?

FXS is a full mutation of the FMR1 gene. FXTAS is only seen in those with a premutation of the FMR1 gene.

For more information:

• Fragile X Syndrome   
• Fragile X Info Series: Fragile X Syndrome An Overview for Families and Providers  
• FXTAS  
• Fragile X Info Series: FXTAS