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Related Experiment Videos

Rett syndrome: potential gene sources--phenotypical variability

H O Akesson1, J Wahlström, I W Engerström

  • 1Department of Psychiatry, Sahlgrenska Hospital, Göteborg, Sweden.

Clinical Genetics
|October 1, 1995
PubMed
Summary

Swedish Rett syndrome (RS) shows a strong common ancestry, with many affected females tracing back to the same homesteads. This genetic link may explain disease variants and transmission patterns.

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Area of Science:

  • Genetics
  • Neurology
  • Medical History

Background:

  • Previous studies indicated a common ancestral origin for classical Swedish Rett syndrome (RS) females.
  • A significant percentage of RS patients originated from the same homesteads generations ago.

Purpose of the Study:

  • To perform an a priori test of the initial genealogical findings in Swedish Rett syndrome.
  • To investigate the prevalence of common ancestry and its potential impact on RS phenotypical variability.

Main Methods:

  • Genealogical tracing of an additional 20 consecutively identified Swedish Rett syndrome (RS) females.
  • Analysis of ancestral origins, including homestead and geographic "Rett areas."
  • Assessment of consanguineous marriage rates among grandparents of RS patients.

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Main Results:

  • 53% of the 19 RS females originated from defined "Rett areas," with 58% traceable to the same homestead.
  • Two distinct clusters of three RS females each shared common ancestors from two couples.
  • Consanguineous marriages were significantly more frequent (11%) in the RS patient group compared to the general Swedish population (1%).

Conclusions:

  • The study confirms the high rate of common ancestry among Swedish Rett syndrome (RS) females.
  • Phenotypical variability in RS is observed among interrelated females, suggesting a genetic component.
  • Genealogical data suggest a possible transmission model involving premutations that can lead to full mutations over generations, potentially influenced by homozygous parental premutations.