An increased number of contiguous trinucleotide repeats in the DNA sequence from one generation to the next. The presence of these regions is associated with diseases such as FRAGILE X SYNDROME and MYOTONIC DYSTROPHY. Some CHROMOSOME FRAGILE SITES are composed of sequences where trinucleotide repeat expansion occurs.
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Expansion, Trinucleotide Repeat — Expansions, Trinucleotide Repeat — Repeat Expansion, Trinucleotide — Repeat Expansions, Trinucleotide — Trinucleotide Repeat Expansions — Expanded Trinucleotide Repeat — Expanded Trinucleotide Repeats — Repeat, Expanded Trinucleotide — Repeats, Expanded Trinucleotide — Trinucleotide Repeat, Expanded — Trinucleotide Repeats, Expanded