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Expansion of triplet repeat sequences such as (CTG)n, (CGG)n, and (GAA)n causes human genetic diseases. Since DNA is packaged into arrays of nucleosomes in eukaryotic cells, chromatin may be involved in the mechanism of triplet repeat diseases. To elucidate this issue, we have examined effects of triplet repeat sequences on the chromatin organization in vivo using well defined yeast minichromosomes. We show here that (CGG)12 disrupts an array of positioned nucleosomes, whereas (CTG)12 promotes the nucleosome formation. Thus, triplet repeat sequences can affect the chromatin organization in vivo, which may contribute to the triplet repeat expansion or alterations in the expression of genes associated with triplet repeat diseases.

Chromatin structure of yeast minichromosomes containing triplet repeat sequences associated with human hereditary neurological diseases