DMPK

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The DMPK gene at 9q13.2-q13.3 causes myotonic dystrophy type I through diverse effects on nearby gene regulation if it has expanded CTG repeats (200-2000 plus) in the 3-prime untranslated region of the code for dystrophia myotonica protein kinase.

  • Normal 5 to 30 CTG repeats
  • ≥38 repeats usual cut off for disease
  • Mild 50 to 80 CTG repeats
  • Severe 2,000 or more CTG repeats
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