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Related Experiment Videos

Mutation screening in Rett syndrome patients.

F Xiang1, S Buervenich, P Nicolao

  • 1Department of Clinical Neuroscience, Karolinska Hospital, Stockholm, Sweden. Fengqing.Xiang@cmm.ki.se

Journal of Medical Genetics
|April 4, 2000
PubMed
Summary

Mutations in the MECP2 gene were identified in sporadic Rett syndrome (RTT) cases, but not in familial RTT. Further genetic analysis of six candidate genes revealed no mutations, suggesting other factors may be involved in RTT.

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Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Background:

  • Rett syndrome (RTT) is a neurodevelopmental disorder with unclear genetic underpinnings.
  • Recent studies linked MECP2 gene mutations to approximately 50% of RTT cases.

Purpose of the Study:

  • To screen the MECP2 gene for mutations in familial and sporadic RTT cases.
  • To investigate other potential genetic factors on the X chromosome or autosomes in RTT.
  • To analyze gene expression patterns in RTT.

Main Methods:

  • Mutation screening of the MECP2 gene in 19 familial and 59 sporadic RTT cases.
  • Evaluation of six candidate genes (UBE1, UBE2I, GdX, SOX3, GABRA3, CDR2) for mutations.
  • In situ hybridization to assess gene expression of MECP2, GdX, GABRA3, and L1CAM.

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Main Results:

  • MECP2 mutations were found in 27 sporadic RTT patients, but not in familial RTT cases.
  • No mutations were detected in the coding regions of the six candidate genes.
  • No significant differences in gene expression of MECP2, GdX, GABRA3, and L1CAM were observed in brain regions between RTT patients and controls.

Conclusions:

  • MECP2 mutations are associated with sporadic RTT.
  • The investigated candidate genes are unlikely to play a causative role in RTT.
  • Further research is needed to identify additional genetic factors contributing to RTT.