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Unstable triplet repeat diseases

D G Monckton1, C T Caskey

  • 1Department of Molecular and Human Genetics, Howard Hughes Medical Institute, Baylor College of Medicine, Houston, Tex 77030.

Circulation
|January 15, 1995
PubMed
Summary
This summary is machine-generated.

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Human molecular genetics·2001

Triplet repeat expansions in DNA cause seven inherited human disorders. These DNA sequences show instability, leading to varied genetic inheritance and symptoms.

Area of Science:

  • Genetics
  • Molecular Biology
  • Human Diseases

Background:

  • Seven inherited human disorders are linked to specific DNA sequence abnormalities.
  • Intragenic expansion of triplet repeat DNA sequences is a common factor in these conditions.

Purpose of the Study:

  • To summarize the genetic basis of human disorders caused by triplet repeat expansions.
  • To explain the molecular mechanisms underlying the instability of these DNA sequences.

Main Methods:

  • Review of genetic and molecular studies on triplet repeat expansion disorders.
  • Analysis of DNA sequence instability in germline and somatic tissues.

Main Results:

  • Triplet repeat expansions are associated with seven distinct inherited human disorders.

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  • These DNA repeats exhibit significant instability across different tissues and generations.

    • Conclusions:

    • Triplet repeat DNA instability is a key factor in the pathogenesis of these disorders.
    • Understanding this instability is crucial for explaining disease variability and inheritance patterns.