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see nucleic acidnucleic acid,
any of a group of organic substances found in the chromosomes of living cells and viruses that play a central role in the storage and replication of hereditary information and in the expression of this information through protein synthesis.
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a coding unit, a set of three nucleotides (triplet) that determines the position of a particular amino acid in a polypeptide chain synthesized under the control of a gene. A codon is a unit of the genetic code by means of which all the genetic information is “recorded” in DNA and RNA molecules. Many amino acids have more than one codon (so-called degeneracy of the code). There are three codons which do not code amino acids; rather, they determine the beginning or end of the synthesis of a polypeptide chain.


The basic unit of the genetic code, comprising sequential, nonoverlapping three-nucleotide sequences in messenger ribonucleic acid, each of which is translated into one amino acid; 61 of the 64 codons code for a specific protein synthesis; the other 3 are stop codons that specify termination of the growing polypeptide or protein chain.
References in periodicals archive ?
In this essay I focus on two specific methods, one for modeling selection at the level of codons in protein-coding sequences, and one for modeling gene flow within the context of the demographic history of reproductive isolation at the level of nucleotide sequences.
The genetic survey of the patient demonstrated compound heterozygous mutations in the G6PC gene, including a codon 83 [c.
Both the amino acids are hydrophilic with the same number of codons, that is, six.
Sequences of Pfdhfr gene spanning codons 16, 50, 51, 59, 108 and 164 were compared with GenBank sequence (accession no.
Diversification: degenerate codons are synthesized using trimer phosphoramidites corresponding to 20 natural amino acids, which exclude stop codons.
The activities were designed to teach students how to read a messenger RNA (mRNA) codon sequence and match that codon up with an amino acid.
When expressed in yeast, however, the codons of a human gene may not be optimal for the high expression of recombinant protein.
Looking more closely, the team found that instead of reading the stop sign as "stop," ribosomes interpreted the pseudouridine-containing codon as an instruction to insert one of the amino acids serine, threonine, phenylalanine or tyrosine into the protein.
The detection of double mutations at codons 12 and 13 by direct sequencing corresponded to 1.
serpens, el codon de inicio de este marco de lectura parece corresponder a la tradicional metionina, en lugar de la leucina reportada en L.
6 [micro]g/ ml of both codons 194 and 399 primers (or 0.
The words strung together in an RNA -- like beads in a necklace -- are read in the ribosome and then the ribosome assembles for every codon its appropriate amino acid.