Hereditary genetic disease caused by mutation of the FMR1 gene on the X chromosome, represents the most common hereditary genetic cause of intellectual disability. Prevalence: 1:4000 males, 1:8000 females. X-linked transmission: males more severely affected (only one X chromosome), females often less symptomatic (second X chromosome partially compensates).
Clinical characteristics: mild-severe intellectual disability, language delay, behavioral disorders (hyperactivity, anxiety, repetitive behaviors, poor eye contact), autistic traits (30% meet DSM autism criteria), facial dysmorphisms (elongated face, prominent ears, macroorchidism in males post-puberty). Variable symptoms, especially in females. Diagnosis: molecular genetic test (FMR1 gene analysis), recommended with family history or compatible symptoms. No specific cure exists. Symptomatic treatment: early educational interventions, speech therapy, behavioral therapy, drugs for ADHD/anxiety, family support. Genetic counseling fundamental for families: recurrence risk, prenatal diagnosis, informed reproductive choices.
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Author: DisabilityHub Editorial Team
Created: 01/25/2026
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