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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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Mouse Models of Cancer Study02:43

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Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
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Lentiviral Mediated Production of Transgenic Mice: A Simple and Highly Efficient Method for Direct Study of Founders
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DRPLA: recent advances in research using transgenic mouse models.

Kazushi Suzuki1, Toshiya Sato, Mitsunori Yamada

  • 1Department of Neurology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.

Methods in Molecular Biology (Clifton, N.J.)
|June 12, 2013
PubMed
Summary
This summary is machine-generated.

Dentatorubral-pallidoluysian atrophy (DRPLA) is a trinucleotide repeat disease. Mouse models reveal that CAG repeat length drives neuronal dysfunction and intranuclear protein accumulation, key to DRPLA pathogenesis without neuronal loss.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Dentatorubral-pallidoluysian atrophy (DRPLA) is a trinucleotide repeat disease prevalent in Japan.
  • Transgenic mouse models are crucial for understanding DRPLA pathogenesis.

Purpose of the Study:

  • To investigate the role of CAG repeat length in DRPLA pathogenesis using transgenic mouse models.
  • To elucidate the relationship between CAG repeat instability, protein accumulation, and neurological phenotypes.

Main Methods:

  • Generation of transgenic mouse lines (Q76 and Q129) with varying CAG repeat lengths in the DRPLA gene.
  • Analysis of somatic and intergenerational CAG repeat instability.
  • Assessment of neurological phenotypes and neuronal intranuclear accumulation (NIA) of mutant proteins.

Main Results:

  • Q76 mice exhibited CAG repeat instability but no overt neurological phenotype.
  • Q129 mice, with expanded CAG repeats (129), displayed significant neurological deficits and massive NIA.
  • Neuronal loss was not observed in either mouse strain, despite marked dysfunction in Q129 mice.

Conclusions:

  • CAG repeat length is a critical determinant of DRPLA pathogenesis.
  • Neuronal dysfunction, characterized by NIA, precedes neuronal loss in DRPLA.
  • The findings support "neuronal dysfunction without neuronal loss" as a central concept in DRPLA pathogenesis.