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Trinucleotide repeats associated with human disease

M Mitas1

  • 1Department of Biochemistry and Molecular Biology, Oklahoma State University, 246 Noble Research Center, Stillwater, OK 74078, USA. mmitas@biochem.okstate.edu

Nucleic Acids Research
|June 15, 1997
PubMed
Summary

Triplet repeat expansion diseases (TREDs) involve gene mutations. These genetic disorders, often showing anticipation, are linked to specific DNA sequences forming hairpin structures, influencing disease progression.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biophysics

Background:

  • Triplet repeat expansion diseases (TREDs) are genetic disorders caused by amplification of specific DNA repeats.
  • Anticipation, characterized by earlier onset and increased severity in successive generations, is a hallmark of TREDs.
  • The molecular mechanisms underlying triplet repeat expansion and associated diseases are not fully understood.

Purpose of the Study:

  • To summarize hairpin structures formed by disease-associated trinucleotide repeats.
  • To discuss the potential role of these structures in triplet repeat expansion.
  • To explore the relationship between hairpin formation, methylation, and demethylation of CGG.CCG repeats.

Main Methods:

  • Review of biophysical and biochemical studies on DNA hairpin structures.
  • Analysis of DNA sequence databases for specific repeat sequences.
  • Discussion of theoretical models for triplet repeat expansion mechanisms.

Main Results:

  • Five disease-associated complementary DNA sequences (d(CGG.CCG), (CAG)n, d(CTG)n, d(GAA)n) form stable hairpin structures.
  • Other sequences like d(GAC)n and d(GTC)n also form hairpins but are not found in disease-associated contexts.
  • Most remaining triplet repeat sequences are unlikely to form stable hairpins under physiological conditions.

Conclusions:

  • Hairpin structures formed by specific trinucleotide repeats are likely key players in the pathogenesis of TREDs.
  • Understanding these structures provides insights into the mechanisms of triplet repeat expansion.
  • Further research into hairpin formation and epigenetic modifications like methylation is crucial for TREDs.

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