What is mosaicism in Fragile X syndrome (FXS)?

A small number of individuals with FXS have what is called “mosaicism.” This means they have a mixture of cells with different CGG repeat numbers (full and premutation) and/or methylation status.

Learn more:

• https://fragilex.org/our-research/treatment-recommendations/mosaicism/
• Fragile X Syndrome Testing and Diagnosis   
• Fragile X Info Series: Fragile X Testing 
• Genetics & Inheritance 
• NFXF Webinar Series: Genetics of Fragile X 
• NFXF Webinar Series: Fragile X Genetics - Mosaicism