Genes are named when they are discovered. Often the name isn’t exactly the same as the condition, in case it is later discovered that there is more than one gene involved in the condition. The gene that causes Fragile X is called the “FMR1 gene,” which stands for fragile X mental retardation gene. Though the term “mental retardation” has given way in recent years to the more generally accepted term of “intellectual disabilities,” the scientific name of the gene can’t change with the times.
- See more at: http://www.fragilex.org/fragile-x-associated-disorders/genetics-and-inheritance/fmr1-gene/#sthash.JmmUaZEd.dpuf