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Rett syndrome and genetic drift.

E M Bühler1, N J Malik, M Alkan

  • 1Department of Medical Genetics, Basel University Children's Hospital, Switzerland.

Brain & Development
|June 18, 1999
PubMed
Summary

Rett syndrome (RS) may involve autosomal recessive genes, not just X chromosome genes, particularly in familial cases. This study estimates the recessive mutation frequency at 22.5%.

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Area of Science:

  • Genetics
  • Medical Genetics
  • Population Genetics

Background:

  • Rett syndrome (RS) has been traditionally attributed to X chromosome gene mutations.
  • Recent genealogical data suggest potential involvement of autosomal recessive genes, especially in familial RS cases.

Purpose of the Study:

  • To re-evaluate the genetic basis of Rett syndrome.
  • To calculate gene frequencies considering both X-linked and autosomal recessive models.
  • To explain RS variants and carrier existence using a theoretical model.

Main Methods:

  • Application of a theoretical genetic model (previously published by authors).
  • Calculation of gene frequencies using observed data for sporadic and familial RS cases.
  • Inclusion of genetic drift in inbred populations.

Main Results:

  • An autosomal recessive mutation frequency, or frequent polymorphism, is estimated at 22.5%.
  • The model accounts for 'formes frustes' and suggests the existence of both female and male carriers.
  • The findings challenge the sole X chromosome gene hypothesis for RS.

Conclusions:

  • Autosomal recessive inheritance plays a significant role in Rett syndrome, alongside X-linked factors.
  • The estimated high frequency of the autosomal recessive factor warrants further investigation.
  • The study provides a framework for understanding the complex genetic architecture of Rett syndrome.

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