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Variable expressivity and mutation databases: The androgen receptor gene mutations database.

B Gottlieb1, L K Beitel, M A Trifiro

  • 1Lady Davis Institute for Medical Research, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Canada. MC33@musica.mcgill.ca

Human Mutation
|April 24, 2001
PubMed
Summary
This summary is machine-generated.

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Genetic mutations do not always cause the same phenotype. Somatic mosaicism, where mutations occur in some cells, explains variable expressivity in Mendelian disorders and impacts mutation databases.

Area of Science:

  • Genetics
  • Molecular Biology
  • Medical Genetics

Background:

  • Genetics traditionally assumes genotype dictates phenotype.
  • Mutation databases rely on consistent genotype-phenotype correlations.
  • Mendelian disorders often exhibit variable expressivity, challenging this assumption.

Purpose of the Study:

  • To investigate the impact of somatic mosaicism on phenotypic variability in genetic disorders.
  • To assess the implications of variable expressivity for the accuracy and utility of mutation databases.

Main Methods:

  • Analysis of existing mutation databases, specifically the AR gene mutations database.
  • Review of documented cases of variable expressivity linked to somatic mutations.
  • Discussion of the theoretical impact of genetic heterogeneity and somatic mutations on mutation databases.

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Main Results:

  • Identical mutations in the androgen receptor (AR) gene cause varying degrees of androgen insensitivity.
  • Somatic mosaicism accounts for phenotypic variability in at least five AR gene mutation cases.
  • Variable expressivity in monogenic traits is increasingly linked to somatic mosaicism.

Conclusions:

  • Somatic mosaicism is a significant factor contributing to variable expressivity in genetic disorders.
  • The presence of genetic heterogeneity within an organism complicates genotype-phenotype relationships.
  • Mutation databases require re-evaluation to account for somatic mutations and evolving genotypes over a lifetime.