Nucleic Acids Research, Vol 25, Issue 12 2245-2254, Copyright © 1997 by Oxford University Press
M Mitas
Triplet repeat expansion diseases (TREDs) are characterized by the
coincidence of disease manifestation with amplification of d(CAG. CTG),
d(CGG.CCG) or d(GAA.TTC) repeats contained within specific genes.
Amplification of triplet repeats continues in offspring of affected
individuals, which generally results in progressive severity of the disease
and/or an earlier age of onset, phenomena clinically referred to as
'anticipation'. Recent biophysical and biochemical studies reveal that five
of the six [d(CGG)n, d(CCG)n, (CAG)n, d(CTG)n and d(GAA)n] complementary
sequences that are associated with human disease form stable hairpin
structures. Although the triplet repeat sequences d(GAC)n and d(GTC)n also
form hairpins, repeats of the double-stranded forms of these sequences are
conspicuously absent from DNA sequence databases and are not anticipated to
be associated with human disease. With the exception of d(GAG)n and
d(GTG)n, the remaining triplet repeat sequences are unlikely to form
hairpin structures at physiological salt and temperature. The details of
hairpin structures containing trinucleotide repeats are summarized and
discussed with respect to potential mechanisms of triplet repeat expansion
and d(CGG.CCG) n methylation/demethylation.
REVIEWS
Trinucleotide repeats associated with human disease
Department of Biochemistry and Molecular Biology, Oklahoma State University, 246 Noble Research Center, Stillwater, OK 74078, USA. mmitas@biochem.okstate.edu
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