All the following diseases are associated with triplet and other repeat sequences except: (A) Huntington's disease, (B) Friedreich's ataxia, (C) Myotonic dystrophy, (D) Hereditary motor-sensory neuropathy
Answer is D. Disease Nucleotide Repeat Gene affected Chromosome Fragile X syndrome CGG FMR1 Sex X chromosome Friedrich ataxia GAA FXN 9 Huntington&;s disease CAG HTT 4 Myotonic dystrophy - type 1 CTG DMPK 19 Reference: GHAI Essential pediatrics, 8th edition