Bio::Tools::CodonTable - Bioperl codon table object This is a read-only class for all known codon tables. The IDs are the ones used by nucleotide sequence databases. All common IUPAC ambiguity codes for DNA, RNA and animo acids are recognized. # to use use Bio::Tools::CodonTable; # defaults to ID 1 "Standard" $myCodonTable = Bio::Tools::CodonTable->new(); $myCodonTable2 = Bio::Tools::CodonTable -> new ( -id => 3 ); # change codon table $myCodonTable->id(5); # examine codon table print join (' ', "The name of the codon table no.", $myCodonTable->id(4), "is:", $myCodonTable->name(), "\n"); # translate a codon $aa = $myCodonTable->translate('ACU'); $aa = $myCodonTable->translate('act'); $aa = $myCodonTable->translate('ytr'); # reverse translate an amino acid @codons = $myCodonTable->revtranslate('A'); @codons = $myCodonTable->revtranslate('Ser'); @codons = $myCodonTable->revtranslate('Glx'); @codons = $myCodonTable->revtranslate('cYS', 'rna'); #boolean tests print "Is a start\n" if $myCodonTable->is_start_codon('ATG'); print "Is a termianator\n" if $myCodonTable->is_ter_codon('tar'); print "Is a unknown\n" if $myCodonTable->is_unknown_codon('JTG'); Codon tables are also called translation tables or genetics codes since that is what they try to represent. A bit more complete picture of the full complexity of codon usage in various taxonomic groups presented at the NCBI Genetic Codes Home page. CodonTable is a BioPerl class that knows all current translation tables that are used by primary nucleotide sequence databases (GenBank, EMBL and DDBJ). It provides methods to output information about tables and relationships between codons and amino acids. This class and its methods recognized all common IUPAC ambiguity codes for DNA, RNA and animo acids. The translation method follows the conventions in EMBL and TREMBL databases. It is a nuisance to separate RNA and cDNA representations of nucleic acid transcripts. The CodonTable object accepts codons of both type as input and allows the user to set the mode for output when reverse translating. Its default for output is DNA. Note: This class deals with individual codons and amino acids, only. Call it from your own objects to translate and reverse translate longer sequences. The amino acid codes are IUPAC recommendations for common amino acids: A Ala Alanine R Arg Arginine N Asn Asparagine D Asp Aspartic acid C Cys Cysteine Q Gln Glutamine E Glu Glutamic acid G Gly Glycine H His Histidine I Ile Isoleucine L Leu Leucine K Lys Lysine M Met Methionine F Phe Phenylalanine P Pro Proline S Ser Serine T Thr Threonine W Trp Tryptophan Y Tyr Tyrosine V Val Valine B Asx Aspartic acid or Asparagine Z Glx Glutamine or Glutamic acid X Xaa Any or unknown amino acid It is worth noting that, "Bacterial" codon table no. 11 produces an polypeptide that is, confusingly, identical to the standard one. The only differences are in available initiator codons. NCBI Genetic Codes home page: http://www.ncbi.nlm.nih.gov/htbin-post/Taxonomy/wprintgc?mode=c EBI Translation Table Viewer: http://www.ebi.ac.uk/cgi-bin/mutations/trtables.cgi Amended ASN.1 version with ids 16 and 21 is at: ftp://ftp.ebi.ac.uk/pub/databases/geneticcode/ Thank your for Matteo diTomasso for the original Perl implementation of these tables.

Mailing Lists
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Reporting Bugs
report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution. Bug reports can be submitted via email or the web: bioperl-bugs@bio.perl.org http://bio.perl.org/bioperl-bugs/ Email: heikki@ebi.ac.uk Address: EMBL Outstation, European Bioinformatics Institute Wellcome Trust Genome Campus, Hinxton Cambs. CB10 1SD, United Kingdom The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _

id
Title : id Usage : $obj->id(3); $id_integer = $obj->id(); Function: Sets or returns the id of the translation table. IDs are integers from 1 to 15, excluding 7 and 8 which have been removed as redundant. If an invalid ID is given the method returns 0, false. Example : Returns : value of id, a scalar, 0 if not a valid Args : newvalue (optional)

name
Title : name Usage : $obj->name() Function: returns the descriptive name of the translation table Example : Returns : A string Args : None

translate
Title : translate Usage : $obj->translate('YTR') Function: Returns one letter amino acid code for a codon input. Returns 'X' for unknown codons and codons that code for more than one amino acid. Returns an empty string if input is not three characters long. Exceptions for these are: - IUPAC amino acid code B for Aspartic Acid and Asparagine, is used. - IUPAC amino acid code Z for Glutamic Acid, Glutamine is used. - if the codon is two nucleotides long and if by adding an a third character 'N', it codes for a single amino acid (with exceptions above), return that, otherwise return empty string. Returns empty string for other input strings that are not three characters long. Example : Returns : One letter ambiguous IUPAC amino acid code Args : a codon = a three character, ambiguous IUPAC nucleotide string

translate_strict
Title : translate_strict Usage : $obj->translate_strict('ACT') Function: returns one letter amino acid code for a codon input Fast and simple translation. User is responsible to resolve ambiguous nucleotide codes before calling this method. Returns 'X' for unknown codons and an empty string for input strings that are not three characters long. It is not recommended to use this method in a production environment. Use method translate, instead. Example : Returns : A string Args : a codon = a three nucleotide character string

revtranslate
Title : revtranslate Usage : $obj->revtranslate('G') Function: returns codons for an amino acid Returns an empty string for unknown amino acid codes. Ambiquous IUPAC codes Asx,B, (Asp,D; Asn,N) and Glx,Z (Glu,E; Gln,Q) are resolved. Both single and three letter amino acid codes are accepted. '*' and 'Ter' are used for terminator. By default, the output codons are shown in DNA. If the output is needed in RNA (tr/t/u/), add a second argument 'RNA'. Example : $obj->revtranslate('Gly', 'RNA') Returns : An array of three lower case letter strings i.e. codons Args : amino acid, 'RNA'

is_start_codon
Title : is_start_codon Usage : $obj->is_start_codon('ATG') Function: returns true (1) for all codons that can be used as a translation start, false (0) for others. Example : $myCodonTable->is_start_codon('ATG') Returns : boolean Args : codon

is_ter_codon
Title : is_ter_codon Usage : $obj->is_ter_codon('GAA') Function: returns true (1) for all codons that can be used as a translation tarminator, false (0) for others. Example : $myCodonTable->is_ter_codon('ATG') Returns : boolean Args : codon

is_unknown_codon
Title : is_unknown_codon Usage : $obj->is_unknown_codon('GAJ') Function: returns false (0) for all codons that are valid, true (1) for others. Example : $myCodonTable->is_unknown_codon('NTG') Returns : boolean Args : codon

_unambiquous_codons
Title : _unambiquous_codons Usage : @codons = _unambiquous_codons('ACN') Function: Example : Returns : array of strings (one letter unambiguous amino acid codes) Args : a codon = a three IUPAC nucleotide character string