Trinucleotide Repeat Disorder

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A class of clinically heterogenous disorders, defined by the presence of an abnormal and unstable expansion of DNA—triplet repeats—in the mutant gene, with up to 200 copies of the repeated trinucleotide
Examples Hereditary—CAG repeats (Huntington’s disease, Kennedy’s disease), CGG (fragile X syndrome), GCT (myotonic dystrophy, spinal and bulbar muscle atrophy); Acquired—some forms of colourectal CA