CS 5124: Algorithms in Bioinformatics

Fall Semester, 2003
The Genetic Code for Computer Scientists

		Second Position of Codon
		T	C	A	G
F i r s t   P o s i t i o n	T	TTT Phenylalanine (Phe) [F] TTC TTA Leucine (Leu) [L] TTG	TCT Serine (Ser) [S] TCC TCA TCG	TAT Tyrosine (Tyr) [Y] TAC TAA Stop (Ter) [end] TAG	TGT Cysteine (Cys) [C] TGC TGA Stop (Ter) [end] TGG Tryptophan (Trp) [W]	T C A G	T h i r d   P o s i t i o n
	C	CTT Leucine (Leu) [L] CTC CTA CTG	CCT Proline (Pro) [P] CCC CCA CCG	CAT Histidine (His) [H] CAC CAA Glutamine (Gln) [Q] CAG	CGT Arginine (Arg) [R] CGC CGA CGG	T C A G
	A	ATT Isoleucine (Ile) [I] ATC ATA ATG Methionine (Met) [M]	ACT Threonine (Thr) [T] ACC ACA ACG	AAT Asparagine (Asn) [N] AAC AAA Lysine (Lys) [K] AAG	AGT Serine (Ser) [S] AGC AGA Arginine (Arg) [R] AGG	T C A G
	G	GTT Valine (Val) [V] GTC GTA GTG	GCT Alanine (Ala) [A] GCC GCA GCG	GAT Aspartic Acid (Asp) [D] GAC GAA Glutamic Acid (Glu) [E] GAG	GGT Glycine (Gly) [G] GGC GGA GGG	T C A G

NOTES:

1. All 64 three-letter codons have a unique meaning. For most (e.g., TTG), the meaning is the amino acid (Leucine) given to the right of the codon in the table. For each amino acid, its three-letter abbreviation is given in parentheses (Leu) and its 1-letter abbreviation in square brackets [L].

   There are also three Stop codons: TAA, TAG, and TGA.

2. A number of the amino acids and their codons are color coded to help distinguish the correspondence.
   • Leucine is coded orange-red.

   • Serine is coded turquoise.

   • The Stop codons are red.

   • Histidine is coded dark blue.

   • Arginine is coded magenta.

   • Methionine, whose code is the Start codon, is coded dark green.

   • Asparagine is coded maroon.

   • Aspartic Acid is coded peru.

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