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Fragile X syndrome (FXS) is a genetic neurodevelopmental disorder characterized by mild-to-moderate intellectual disability. [1] The average IQ in males with FXS is under 55, while about two thirds of affected females are intellectually disabled.
Fragile X-associated tremor/ataxia syndrome (FXTAS) is a late-onset neurodegenerative disorder most frequently seen in male premutation carriers of Fragile X syndrome (FXS) over the age of 50. [ 4 ] [ 5 ] The main clinical features of FXTAS include problems of movement with cerebellar gait ataxia and action tremor .
Befiradol (also known as NLX-112) is targeted to the treatment of movement disorders, notably dyskinesia in Parkinson's disease, whereas F-15599 (also known as NLX-101) is intended for the treatment of autism spectrum disorders including Rett syndrome and Fragile X syndrome.
Emestedastat (proposed brand name Xanamem; developmental code name UE-2343) is a steroidogenesis inhibitor which is under development for the treatment of major depressive disorder, Alzheimer's disease, and fragile X syndrome.
X-linked intellectual disability and macroorchidism (fragile X syndrome) X: X-linked spinal-bulbar muscle atrophy (spinal and bulbar muscular atrophy) X: Xp11.2 duplication syndrome Xp11.2: D [34] 1:1,000,000 X-linked severe combined immunodeficiency (X-SCID) X: X-linked sideroblastic anemia (XLSA) ALAS2 (X) 47,XXX (triple X syndrome) X C 1: ...
Females with one affected X chromosome and one normal X chromosome tend to have milder symptoms. Unlike many other types of intellectual disability, the genetics of these conditions are relatively well understood. [2] [3] It has been estimated there are ~200 genes involved in this syndrome; of these ~100 have been identified. [4]
The condition is commonly inherited in connection with fragile X syndrome (FXS), which is also the second most common genetic cause of intellectual disability. [1] The condition is also a rare sign of McCune–Albright syndrome. [2] The opposite of macroorchidism is called microorchidism, which is the condition of abnormally small testes.
The first trinucleotide repeat disease to be identified was fragile X syndrome, which has since been mapped to the long arm of the X chromosome. Patients carry from 230 to 4000 CGG repeats in the gene that causes fragile X syndrome, while unaffected individuals have up to 50 repeats and carriers of the disease have 60 to 230 repeats.