FRAGILE X SYNDROME (FXS) BY NOOR ADILAH ZULKIFLI, NURUL JAWAHIR ZOHDI
What is Fragile X Syndrome (FXS)? Inherited disease cause of mental retardation X-linked disease Incidence of 1:4500 males, 1:9000 females Premutation carrier 1:1000 males, 1:400 females Fragile X Tremor/Ataxia Syndrome (FXTAS) Fragile X Premature Ovarian Insufficiency (FXPOI)
Causes 1) Genetic changes Mutation of Fragile X Mental Retardation One (FMR-1) gene on X chromosome. This gene could not produce protein which is necessary for brain development. Most commonly an increased in the number of CGG trinucleotide repeats. Typical : 6-44 repeats Premutation : 55-200 repeats Full mutation : > 200 repeats 2) Environmental factor
Signs and symptoms Large prominent ears and a long face Intellectual disability Speech and language delay Behavioral issues such as hyperactivity, temper tantrums and hand flapping Emotional problems ADHD Macroorchidism
Signs and symptoms in the premutation carrier Mild intellectual disability Shy personality and selective lack of speech
Autism and FXS Autism -- characterized by impaired social interaction and communication, and by restricted and repetitive behavior. Autismbehavioral diagnosis FXSgenetic diagnosis 15-33% of FXS children have autism 2-6% of children with autism is diagnosed with FSX
Diagnosis DNA test Prenatal testing Genetic counselling Amniocentesis Chorionic villus sampling Genetic counselling
Treatment Currently no known cure Special education services Special X Clinics Therapy Drugs Stimulants Antipsychotics
Reference National Fragile X Foundation, www.fragilex.org Wikipedia: Fragile X syndrome, http://en.wikipedia.org/wiki/Fragile_X_syndrome PubMed Health: Fragile X syndrome, http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002633/ Persatuan Penyakit Jarang Jumpa Malaysia (Malaysian Rare Disorders Society) http://www.rightdiagnosis.com/f/fragile_x_syndrome/stats-country.htm#extrapwarning http://www.who.int/genomics/public/geneticdiseases/en/index2.html#Fragile X Disease