/ 
bioperl-1.5.2_004-RCb
/ Bio::Tools::Sim4::Exon

NAME

Bio::Tools::Sim4::Exon - A single exon determined by an alignment

SYNOPSIS

# See Bio::Tools::Sim4::Results for a description of the context.

# an instance of this class is-a Bio::SeqFeature::SimilarityPair

# coordinates of the exon (recommended way):
print "exon from ", $exon->start(),
	" to ", $exon->end(), "\n";

# the same (feature1() inherited from Bio::SeqFeature::FeaturePair)
print "exon from ", $exon->feature1()->start(),
	" to ", $exon->feature1()->end(), "\n";
# also the same (query() inherited from Bio::SeqFeature::SimilarityPair):
print "exon from ", $exon->query()->start(),
	" to ", $exon->query()->end(), "\n";

# coordinates on the matching EST (recommended way):
print "matches on EST from ", $exon->est_hit()->start(),
	" to ", $exon->est_hit()->end(), "\n";

# the same (feature2() inherited from Bio::SeqFeature::FeaturePair)
print "matches on EST from ", $exon->feature2()->start(),
	" to ", $exon->feature2()->end(), "\n";
# also the same (subject() inherited from Bio::SeqFeature::SimilarityPair):
print "exon from ", $exon->subject()->start(),
	" to ", $exon->subject()->end(), "\n";

DESCRIPTION

This class inherits from Bio::SeqFeature::SimilarityPair and represents an exon on a genomic sequence determined by similarity, that is, by aligning an EST sequence (using Sim4 in this case). Consequently, the notion of query and subject is always from the perspective of the genomic sequence: query refers to the genomic seq, subject to the aligned EST hit. Because of this, $exon->start(), $exon->end() etc will always return what you expect.

To get the coordinates on the matching EST, refer to the properties of the feature returned by est_hit().

FEEDBACK

Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to one of the Bioperl mailing lists. Your participation is much appreciated.

bioperl-l@bioperl.org                  - General discussion
http://bioperl.org/wiki/Mailing_lists  - About the mailing lists

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 the web:

http://bugzilla.open-bio.org/

AUTHOR - Ewan Birney, Hilmar Lapp

Ewan Birney <birney-at-sanger.ac.uk> Hilmar Lapp <hlapp-at-gmx.net> or <hilmar.lapp-at-pharma.novartis.com>.

APPENDIX

The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _

percentage_id

Title   : percentage_id
Usage   : $obj->percentage_id($newval)
Function: This is a synonym for 100 * $obj->est_hit()->frac_identical().
Returns : value of percentage_id
Args    : newvalue (optional)

est_hit

Title   : est_hit
Usage   : $est_feature = $obj->est_hit();
Function: Returns the EST hit pointing to (i.e., aligned to by Sim4) this
          exon (i.e., genomic region). At present, merely a synonym for
          $obj->feature2().
Returns : An Bio::SeqFeatureI implementing object.
Args    :