Definition of "premutation"

premutation

adjective
not comparable
1. Of or relating to a premutation.
  Quotations
  Fragile X syndrome is caused by mutations in the FMR1-gene, which is characterized by an expansion of a CGG triplet in the 5’ UTR. Normal individuals have 6–44 CGG repeats, while carriers of gray zone or premutation alleles have 45–54 and 55–200 repeats, respectively.
  2015 July 30, “Positron Emission Tomography (PET) Quantification of GABA A Receptors in the Brain of Fragile X Patients”, in PLOS ONE‎
noun
plural premutations
1. A nucleotide sequence variation that is not enough to be classed as a mutation (for example, does not affect protein expression enough to produce clinical symptoms) but nonetheless represents an unusual variant that is predisposed to still greater variation in future cell divisions (that is, predisposed to leading to a mutation).