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Trinucleotide repeat disorders are caused by abnormal lengths of DNA, consisting of repeated sequences of the same three nucleotides (trinucleotides). Many involve repeats of CAG, which codes for the amino acid glutamine. These expansions are often due to DNA replication errors, specifically a process known as "slippage."
"Anticipation" refers to a phenomenon where the severity of certain trinucleotide repeat disorders increases, and symptoms appear earlier with each successive generation. This is due to the progressive increase in the number of trinucleotide repeats over generations.