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DNA structure, mutations, and human genetic disease.

R R Sinden1, R D Wells

  • 1Institute of Biosciences and Technology, Texas A & M University, Houston.

Current Opinion in Biotechnology
|December 1, 1992
PubMed
Summary

Massive expansion of triplet repeats causes fragile X syndrome, myotonic dystrophy, and Kennedy's disease. This review explores how DNA structure and secondary structures influence these expansions.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomic Instability

Background:

  • Fragile X syndrome, myotonic dystrophy, and Kennedy's disease are linked to expanded DNA triplet repeats.
  • Understanding the mechanisms behind these expansions is crucial for disease research.

Purpose of the Study:

  • To review the relationship between DNA structural diversity and triplet repeat expansion.
  • To explore the role of DNA secondary structures in DNA-directed mutagenesis leading to expansions.

Main Methods:

  • Literature review of studies on DNA structure, secondary structures, and triplet repeat expansions.
  • Analysis of mechanisms linking DNA structural diversity to mutagenesis and repeat expansion.

Main Results:

  • DNA structural diversity, including secondary structures like hairpins and G-quadruplexes, can promote triplet repeat expansion.
  • These structures can stall replication forks or be recognized by repair enzymes, leading to errors and expansion.

Conclusions:

  • DNA secondary structures are key factors in the pathogenesis of triplet repeat expansion disorders.
  • Targeting these structural elements or associated mutagenesis pathways may offer therapeutic strategies.

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