Bio::SeqI - [Developers] Abstract Interface of Sequence (with features)
# Bio::SeqI is the interface class for sequences.
# If you are a newcomer to bioperl, you should
# start with Bio::Seq documentation. This
# documentation is mainly for developers using
# Bio::SeqI implements Bio::PrimarySeqI
$seq = $seqobj->seq(); # actual sequence as a string
$seqstr = $seqobj->subseq(10,50);
# Bio::SeqI has annotationcollections
$ann = $seqobj->annotation(); # annotation object
# Bio::SeqI has sequence features
# features must implement Bio::SeqFeatureI
@features = $seqobj->get_SeqFeatures(); # just top level
@features = $seqobj->get_all_SeqFeatures(); # descend into sub features
Bio::SeqI is the abstract interface of annotated Sequences. These methods are those which you can be guaranteed to get for any Bio::SeqI. For most users of the package the documentation (and methods) in this class are not at useful - this is a developers only class which defines what methods have to be implemented by other Perl objects to comply to the Bio::SeqI interface. Go "perldoc Bio::Seq" or "man Bio::Seq" for more information.
There aren't many method here, because too many complicated functions here would prevent implementations which are just wrappers around a database or similar delayed mechanisms.
Most of the clever stuff happens inside the SeqFeatureI system.
A good reference implementation is Bio::Seq which is a pure perl implementation of this class with a lot of extra pieces for extra manipulation. However, if you want to be able to use any sequence object in your analysis, if you can do it just using these methods, then you know you will be future proof and compatible with other implementations of Seq.
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : get_SeqFeatures
Usage : my @feats = $seq->get_SeqFeatures();
Function: retrieve just the toplevel sequence features attached to this seq
Returns : array of Bio::SeqFeatureI objects
Args : none
This method comes through extension of Bio::FeatureHolderI. See Bio::FeatureHolderI and Bio::SeqFeatureI for more information.
Title : get_all_SeqFeatures
Usage : my @feats = $seq->get_all_SeqFeatures();
Function: returns all SeqFeatures, including sub SeqFeatures
Returns : an array of Bio::SeqFeatureI objects
Args : none
Title : feature_count
Usage : my $count = $seq->feature_count();
Function: Return the number of SeqFeatures attached to a sequence
Returns : integer representing the number of SeqFeatures
Args : none
This method comes through extension of Bio::FeatureHolderI. See Bio::FeatureHolderI for more information.
Title : seq
Usage : my $string = $seq->seq();
Function: Retrieves the sequence string for the sequence object
Returns : string
Args : none
Title : write_GFF
Usage : $seq->write_GFF(\*FILEHANDLE);
Function: Convenience method to write out all the sequence features
in GFF format to the provided filehandle (STDOUT by default)
Returns : none
Args : [optional] filehandle to write to (default is STDOUT)
Title : annotation
Usage : my $ann = $seq->annotation($seq_obj);
Function: retrieve the attached annotation object
Returns : Bio::AnnotationCollectionI or none;
See Bio::AnnotationCollectionI and Bio::Annotation::Collection for more information. This method comes through extension from Bio::AnnotatableI.
Title : species
Function: Gets or sets the species
Example : my $species = $seq->species();
Returns : Bio::Species object
Args : Bio::Species object or none;
See Bio::Species for more information
Title : primary_seq
Usage : my $primaryseq = $seq->primary_seq($newval)
Function: Retrieve the underlying Bio::PrimarySeqI object if available.
This is in the event one has a sequence with lots of features
but want to be able to narrow the object to just one with
the basics of a sequence (no features or annotations).
Returns : Bio::PrimarySeqI
Args : Bio::PrimarySeqI or none;
See Bio::PrimarySeqI for more information
To install BioPerl, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.