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Heterozygote effects in dreher mice.

P R Patrylo1, M Sekiguchi, R S Nowakowski

  • 1Department of Anatomy, UMDNJ-Robert Wood Johnson Medical School, Piscataway 08854.

Journal of Neurogenetics
|April 1, 1990
PubMed
Summary

The dreher mutation (drsst-J allele) in mice shows semidominant inheritance. Heterozygous mice (drsst-J/+) exhibit unique belly spots and hippocampal abnormalities, aiding research into the dreher mutation

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Area of Science:

  • Neurogenetics
  • Developmental Biology
  • Mouse Models

Background:

  • The dreher mutation (dr) in mice causes ataxia and CNS abnormalities.
  • Homozygous dreher mice (dr/dr) display a distinct phenotype including white belly spots and skeletal malformations.
  • The drsst-J allele is a specific variant of the dreher mutation on a B6C3Fe background.

Purpose of the Study:

  • To investigate the inheritance pattern of a novel phenotype observed in the drsst-J mouse colony.
  • To determine if the observed phenotype in non-ataxic mice with belly spots represents a new mutation or heterozygosity for drsst-J.
  • To characterize the neuroanatomical abnormalities in heterozygous drsst-J mice.

Main Methods:

  • Utilized three breeding experiments to analyze the inheritance of the observed traits.
  • Conducted histological examinations of the brain, focusing on the hippocampal formation and cerebellum.
  • Compared the phenotypes of wild-type, heterozygous (drsst-J/+), and homozygous (drsst-J/drsst-J) mice.

Main Results:

  • Breeding experiments confirmed that spotted, non-ataxic mice were heterozygous for the drsst-J allele (drsst-J/+), not a new mutation.
  • Histological analysis revealed abnormalities in the hippocampal formation of drsst-J/+ mice, including increased CA3 pyramidal cells and thickened pyramidal cell layer.
  • Cerebellar foliation and lamination appeared normal in drsst-J/+ mice, unlike in homozygous dreher mice.

Conclusions:

  • The drsst-J allele exhibits semidominant inheritance, with heterozygous mice displaying distinct phenotypic traits.
  • Phenotypic abnormalities in heterozygous drsst-J/+ mice, particularly in the hippocampus, offer insights into the primary developmental defects caused by the dreher mutation.
  • The drsst-J mutation may represent a 'loss of function' mutation, and its semidominant nature is valuable for studying neurodevelopmental defects.

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