11. Q : I saw a notice about a " Fragile X Syndrome " screening. 12. About Fragile X syndrome : http : / / www . fraxa . org 13. Jake was born in Dayton with chromosomal fragile X syndrome , " which causes mental retardation. 14. Some critics called it the X syndrome , after the sign for draws in soccer pools. 15. Other less common chromosomal arrangements include : triple X syndrome , 48, XXXX, and 49, XXXXX. 16. Less commonly known genetically determined neurodevelopmental disorders include Fragile X syndrome , Rett syndrome, and Williams syndrome. 17. This means that healthy parents can have a child with, say, Huntington's or fragile X syndrome . 18. Sherman theorized that the gene responsible for Fragile X syndrome becomes mutated through a two-step process. 19. Novartis discontinued development of mavoglurant for fragile X syndrome in April 2014 following disappointing trial results. 20. His sons both have fragile X syndrome . 