Triplet repeats like (GGC)n are an important class of human genetic markers, and they are also responsible for a number of inherited diseases involving the central nervous system.
A hereditary mental disorder, partially explained by genomic imprinting and the addition of nucleotides to a triplet repeat near the end of an X chromosome.
frameshift mutation ...
As in various types of gene mutation such as trinucleotide repeat amplification or myc gene amplification - naturally occuring aberrations which have greatly increased the copy number of a triplet repeat or of a whole gene respectively in vivo.
 See also: Mutation, Organ, Membrane, Protein, Cells
  
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