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Related Experiment Videos

Sensitivity to low-level radiation in radiosensitive "wasted" mice.

Gayle E Woloschak1, Tatjana Paunesku, Miroslava Protić

  • 1Biosciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439-4833, USA.

Military Medicine
|March 5, 2002
PubMed
Summary

The "wasted" mouse mutation causes T cell and motor neuron defects due to a PCNA gene deletion. This leads to apoptosis, radiation sensitivity, and early death in affected mice.

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Area of Science:

  • Genetics
  • Immunology
  • Neuroscience

Background:

  • The autosomal recessive "wasted" mutation (wst/wst) in mice results in severe T lymphocyte and motor neuron abnormalities.
  • Affected mice exhibit immunodeficiency, hind limb paralysis, radiation sensitivity, and premature death by 28 days of age.

Purpose of the Study:

  • To identify the genetic cause of the wasted mutation.
  • To elucidate the molecular mechanism underlying the observed cellular defects in wasted mice.

Main Methods:

  • Genetic mapping of the wasted mutation to mouse chromosome 2.
  • Sequence analysis of the proliferating cell nuclear antigen (PCNA) gene in wasted mice.
  • Investigation of PCNA gene regulation in T lymphocytes and motor neurons.

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Main Results:

  • The wasted mutation is a 3-bp deletion in the promoter region of the PCNA gene.
  • This deletion disrupts a regulatory element crucial for PCNA expression in T cells and motor neurons.
  • Absence of PCNA expression leads to cellular apoptosis and radiation sensitivity.

Conclusions:

  • The wasted mutation provides a model for studying PCNA gene regulation in T lymphocytes and motor neurons.
  • The identified deletion affects a transfactor binding site, impairing PCNA expression and causing disease phenotypes.
  • Understanding this mechanism may offer insights into related human disorders.