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Abstract. A nonsense mutation occurs when a sense codon, one that codes for an amino acid, is changed to one of the chainâtermination codons, UAG, UAA or UGA. A nonsense suppressor can result from a second mutation affecting the translational apparatus. This mutation enables the cell to insert an amino acid in response to the nonsense codon, resulting in a wildâtype or near wildâtype phenotype. Some suppressor mutations change the anticodon of a transfer ribonucleic acid (tRNA) such that it can pair with the nonsense codon.
a mutation in which one of the three terminator codons in the mRNA used to signal the end of a polypeptide appears in the middle of a genetic message and causes premature termination of transcription and release of incomplete, generally nonfunctional polypeptides from the ribosome.