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Related Experiment Videos

[Huntington's disease--advances in gene mapping]

S Nakamura1

  • 1Third Department of Internal Medicine, Hiroshima University School of Medicine.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|September 1, 1993
PubMed
Summary

Huntington's disease (HD) is a progressive neurodegenerative disorder caused by an expanded CAG trinucleotide repeat in the IT 15 gene. This genetic defect is inherited in an autosomal dominant manner.

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Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Background:

  • Huntington's disease (HD) is a progressive neurodegenerative disorder.
  • HD presents with motor, cognitive, and psychiatric symptoms.
  • The disorder follows an autosomal dominant inheritance pattern.

Purpose of the Study:

  • To identify the genetic defect responsible for Huntington's disease.
  • To isolate and characterize the gene associated with HD.

Main Methods:

  • Utilized polymorphic DNA markers to map the HD gene to chromosome 4.
  • Employed a location cloning approach.
  • Isolated and characterized the IT 15 gene in the 4p 16.3 region.

Main Results:

  • Identified the IT 15 gene located at 4p 16.3.
  • Discovered a polymorphic trinucleotide repeat (CAG)n within the IT 15 gene.
  • Observed an expanded and unstable (CAG)n repeat on HD chromosomes compared to normal chromosomes.
  • The expanded repeat is within the coding sequence of a predicted 348 kd protein unrelated to known genes.

Conclusions:

  • The expanded (CAG)n trinucleotide repeat in the IT 15 gene is the genetic cause of Huntington's disease.
  • This finding provides a molecular basis for the disease's inheritance and progression.

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