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Related Experiment Videos

[Fragile X syndrome].

G Glóver-López1, E Guillén-Navarro

  • 1Hospital Universitario Virgende la Arrixaca, Ctra. Madrid-Cartagena, s/n. E-30120 El Palmar (Murcia). guillermo.glover@carm.es

Revista De Neurologia
|March 1, 2006
PubMed
Summary

Fragile X syndrome, a genetic cause of intellectual disability, results from FMR1 gene CGG triplet expansion. Premutation carriers may develop late-onset ovarian failure or Fragile X-associated Tremor/Ataxia Syndrome (FXTAS).

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Area of Science:

  • Genetics
  • Neuroscience

Context:

  • Fragile X syndrome is a leading inherited cause of intellectual disability.
  • It arises from CGG triplet repeat expansion in the FMR1 gene.
  • Alleles are classified as normal, premutation, or full mutation, with only full mutations causing the syndrome.

Purpose:

  • To describe the genetic basis and clinical manifestations of Fragile X syndrome.
  • To highlight recently identified sub-phenotypes associated with premutation alleles.

Summary:

  • Fragile X syndrome is caused by increased CGG repeats in the FMR1 gene, leading to hypermethylation and reduced FMRP protein production.
  • Individuals with full mutations exhibit Fragile X syndrome.
  • Premutation carriers, particularly females, are increasingly recognized as experiencing early ovarian failure and Fragile X-associated Tremor/Ataxia Syndrome (FXTAS).

Impact:

  • Increases understanding of the Fragile X gene mutation spectrum.
  • Identifies risks for premutation carriers, including ovarian failure and FXTAS.
  • Informs genetic counseling and clinical monitoring for Fragile X-associated disorders.

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