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Related Experiment Videos

A diet-induced mouse model for glutaric aciduria type I.

William J Zinnanti1, Jelena Lazovic, Ellen B Wolpert

  • 1Department of Neurosurgery, Penn State College of Medicine, Hershey, PA 17033, USA.

Brain : a Journal of Neurology
|February 1, 2006
PubMed
Summary

Glutaryl-CoA dehydrogenase deficiency (GA-1) in mice causes striatal injury with high protein or lysine diets. This mouse model shows developmental vulnerability, aiding GA-1 research.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Genetics

Background:

  • Glutaric aciduria type I (GA-1) is an autosomal recessive disorder caused by glutaryl-CoA dehydrogenase (GCDH) deficiency.
  • This deficiency impairs lysine and tryptophan catabolism, leading to glutaric acid (GA) and 3-hydroxyglutaric acid (3-OHGA) accumulation.
  • Affected individuals often experience acute striatal injury during childhood.

Purpose of the Study:

  • To establish a mouse model that replicates the selective striatal vulnerability observed in human GA-1.
  • To investigate the effects of elevated dietary protein and lysine on GCDH-deficient mice.
  • To determine if these dietary challenges can induce acute striatal injury in a GCDH-deficient mouse model.

Main Methods:

  • Utilized GCDH-deficient (Gcdh-/-) mice of different ages (4-week-old and 8-week-old).

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  • Administered high protein and high lysine diets to Gcdh-/- mice.
  • Monitored survival rates, neurological symptoms, and performed histological analyses of brain tissue.

    • Main Results:

    • High protein diets were lethal to both 4- and 8-week-old Gcdh-/- mice within days.
    • High lysine induced vasogenic edema, blood-brain barrier breakdown, GA accumulation, and death in 75% of 4-week-old Gcdh-/- mice.
    • 8-week-old Gcdh-/- mice on high lysine survived but developed white matter lesions, reactive astrocytes, and neuronal loss after 6 weeks.

    Conclusions:

    • The Gcdh-/- mouse model, when challenged with high protein or lysine, effectively mimics key aspects of human GA-1.
    • This model demonstrates developmentally dependent striatal vulnerability, crucial for understanding disease pathogenesis.
    • The findings support the utility of this mouse model for studying GA-1 and developing therapeutic strategies.