| trinucleotide | A combination of three adjacent nucleotides, free or in a polynucleotide or nucleic acid molecule; often used with specific reference to the unit (codon or anticodon) specifying a particular amino acid in expression of the genetic code. (05 Mar 2000) |
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| trinucleotide repeat | <molecular biology> Repetitive part of a genome that may form part of the coding sequence of a gene. The length of such repeats is frequently polymorphic and unstably amplified repeats appear to be the major cause of such genetic diseases as Huntington disease, fragile X syndrome, spinobulbar muscular atrophy and myotonic dystrophy. (18 Nov 1997) |
| trinucleotide repeats | Microsatellite tandem repeats (microsatellite repeats) consisting of three nucleotides dispersed in the euchromatic arms of chromosomes. (12 Dec 1998) |