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[Clinical phenotypes of classic Rett syndrome].

M Nieto-Barrera1, M Nieto-Jiménez, M L Siljeström

  • 1Hospital Universitario Virgen del Rocío, Sevilla, España. med000600@saludalia.com

Revista De Neurologia
|February 25, 2003
PubMed
Summary

Rett syndrome (RS) is classified into three phenotypes based on walking ability. Early loss of walking correlates with faster progression of speech, social, and motor impairments in girls with RS.

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Area of Science:

  • Neurology
  • Genetics
  • Developmental Biology

Context:

  • Rett syndrome (RS) is a progressive neurodevelopmental disorder.
  • RS is caused by mutations in the methyl CpG binding protein 2 (MECP2) gene.
  • Classic RS (CRS) presents with distinct clinical nuances in disease progression.

Purpose:

  • To establish distinct phenotypes of classic Rett syndrome (CRS) based on ambulation.
  • To correlate clinical phenotypes with the progression of key developmental milestones and symptoms.
  • To investigate MECP2 gene mutations within these defined CRS phenotypes.

Summary:

  • Three phenotypes of classic Rett syndrome (CRS) were defined based on the ability to walk.
  • Phenotype I (ambulant, permanent stage III) and Phenotype II (ambulant, transitory stage IV-A) exhibit later onset of symptoms compared to Phenotype III (non-ambulant, stage IV-B).
  • Phenotype III shows earlier onset and faster progression of motor, speech, social, and stereotypic impairments. MECP2 mutations were identified across all three phenotypes.

Impact:

  • This classification aids in understanding the spectrum of Rett syndrome progression.
  • It provides a framework for correlating genotype with phenotype in RS.
  • Further refinement in CRS case definition is needed for precise phenotype-genotype correlations.

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