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Additional recommended knowledge
The principle called Central dogma of molecular biology describes the process of translation of a gene to a protein. Basically specific sequences of DNA act as a template to synthesize mRNA in a process termed "transcription" in the nucleus. This mRNA is exported from the nucleus into the cytoplasm of the cell and acts as a template to synthesize protein in a process called "translation."
Three nucleotide bases form one amino acid in the genetic code. Usually the first three bases of the coding sequence(CDS) of mRNA to be translated into protein are AUG (or ATG in DNA). AUG encodes for methionine, and therefore the first amino acid of many proteins is methionine. The start codon is almost always preceded by an untranslated region 5' UTR.
Very rarely in higher organisms (eukaryotes) non AUG start codons are used.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Start_codon". A list of authors is available in Wikipedia.|