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Neuropathology of Rett syndrome.

Dawna Duncan Armstrong1

  • 1Department of Pathology, Baylor College of Medicine, Houston, Texas 77030, USA. dawnaa@bcm.tmc.edu

Mental Retardation and Developmental Disabilities Research Reviews
|July 12, 2002
PubMed
Summary

Rett syndrome is a unique neurodevelopmental disorder caused by MECP2 mutations. Neuropathology reveals a small brain with altered neuronal structure and neurotransmitter systems, not typical degeneration.

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Area of Science:

  • Neuroscience
  • Genetics
  • Pediatric Neurology

Background:

  • Rett syndrome presents unique neuropathological challenges not definable by standard histology.
  • Previous hypotheses guided exploration of the Rett child's nervous system.

Purpose of the Study:

  • To investigate the neuropathology of Rett syndrome using diverse advanced techniques.
  • To characterize the brain's structural and molecular alterations in Rett syndrome.

Main Methods:

  • Morphometry, Golgi preparations, neuroimaging (CT, MRI), chemistry, immunocytochemistry, autoradiography, and molecular biology.
  • Analysis of neuronal structure, protein expression, and neurotransmitter receptors.

Main Results:

  • Rett brains are small but not progressively shrinking; exhibit reduced dendritic arborization and immature protein expression.
  • Increased neuronal packing density and altered neurotransmitter receptor patterns observed.
  • MECP2 mutation identified as the cause, leading to neuronal mosaicism and specific functional deficits.

Conclusions:

  • Rett syndrome is a distinct neurodevelopmental disorder, not degenerative, storage, malformative, infectious, or neoplastic.
  • Neuropathological findings include microcephaly, altered neuronal morphology, and neurotransmitter system changes.
  • MECP2 mutation underlies the consistent phenotype, small brain size, and functional impairments in hand use and speech.

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