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Related Experiment Videos

Quantitative trait loci modulate ventricular size in the mouse brain.

Corinna C Zygourakis1, Glenn D Rosen

  • 1Charles A. Dana Research Institute, Division of Behavioral Neurology, Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02115, USA.

The Journal of Comparative Neurology
|May 15, 2003
PubMed
Summary

Researchers identified genetic factors influencing mouse brain ventricle size, a heritable trait. A major quantitative trait locus (QTL) on chromosome 8 and interactions on chromosomes 4 and 7 were found, potentially linked to hydrocephalus genes.

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Area of Science:

  • Neuroscience
  • Genetics
  • Quantitative Trait Loci (QTL) analysis

Background:

  • Cerebral ventricular size exhibits significant variation in humans.
  • Abnormal ventricular enlargement is linked to schizophrenia and hydrocephalus, causing cognitive and motor deficits.

Purpose of the Study:

  • To map quantitative trait loci (QTLs) that modulate normal variation in cerebroventricular size in mice.
  • To investigate if genes associated with hydrocephalus also influence typical ventricular size variation.

Main Methods:

  • Utilized digital imaging of mouse brain sections and stereological techniques.
  • Estimated combined lateral and third ventricle volume relative to total brain volume in 228 AXB and BXA recombinant inbred mice and their parent strains.
  • Performed quantitative trait loci (QTL) analysis to identify genetic influences on ventricular size.

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Main Results:

  • Ventricle size, as a percentage of brain volume, is a heritable trait (h² = 0.32).
  • A major QTL (Vent8a) controlling ventricular volume variation was detected on chromosome 8.
  • A significant epistatic interaction affecting ventricular volume was identified between loci on chromosome 4 (Vent4b) and chromosome 7 (Vent7c).

Conclusions:

  • Genetic factors significantly influence normal variation in mouse cerebroventricular size.
  • The identified QTLs (Vent8a, Vent4b, Vent7c) are located near genes previously implicated in hydrocephalus, suggesting a shared genetic basis.
  • This study provides a foundation for further investigation into the genetic underpinnings of ventricular system development and hydrocephalus.