Provided by: libbio-perl-perl_1.6.923-1_all 
NAME
Bio::AlignIO::stockholm - stockholm sequence input/output stream
SYNOPSIS
# Do not use this module directly. Use it via the L<Bio::AlignIO> class.
use Bio::AlignIO;
use strict;
my $in = Bio::AlignIO->new(-format => 'stockholm',
-file => 't/data/testaln.stockholm');
while( my $aln = $in->next_aln ) {
}
DESCRIPTION
This object can transform Bio::Align::AlignI objects to and from stockholm flat file
databases. This has been completely refactored from the original stockholm parser to
handle annotation data and now includes a write_aln() method for (almost) complete
stockholm format output.
Stockholm alignment records normally contain additional sequence-based and alignment-based
annotation
GF Lines (alignment feature/annotation):
#=GF <featurename> <Generic per-file annotation, free text>
Placed above the alignment
GC Lines (Alignment consensus)
#=GC <featurename> <Generic per-column annotation, exactly 1
character per column>
Placed below the alignment
GS Lines (Sequence annotations)
#=GS <seqname> <featurename> <Generic per-sequence annotation, free
text>
GR Lines (Sequence meta data)
#=GR <seqname> <featurename> <Generic per-sequence AND per-column
mark up, exactly 1 character per column>
Currently, sequence annotations (those designated with GS tags) are parsed only for
accession numbers and descriptions. It is intended that full parsing will be added at
some point in the near future along with a builder option for optionally parsing alignment
annotation and meta data.
The following methods/tags are currently used for storing and writing the alignment
annotation data.
Tag SimpleAlign
Method
----------------------------------------------------------------------
AC accession
ID id
DE description
----------------------------------------------------------------------
Tag Bio::Annotation TagName Parameters
Class
----------------------------------------------------------------------
AU SimpleValue record_authors value
SE SimpleValue seed_source value
GA SimpleValue gathering_threshold value
NC SimpleValue noise_cutoff value
TC SimpleValue trusted_cutoff value
TP SimpleValue entry_type value
SQ SimpleValue num_sequences value
PI SimpleValue previous_ids value
DC Comment database_comment comment
CC Comment alignment_comment comment
DR Target dblink database
primary_id
comment
AM SimpleValue build_method value
NE SimpleValue pfam_family_accession value
NL SimpleValue sequence_start_stop value
SS SimpleValue sec_structure_source value
BM SimpleValue build_model value
RN Reference reference *
RC Reference reference comment
RM Reference reference pubmed
RT Reference reference title
RA Reference reference authors
RL Reference reference location
----------------------------------------------------------------------
* RN is generated based on the number of Bio::Annotation::Reference objects
Custom annotation
Some users may want to add custom annotation beyond those mapped above. Currently there
are two methods to do so; however, the methods used for adding such annotation may change
in the future, particularly if alignment Writer classes are introduced. In particular, do
not rely on changing the global variables @WRITEORDER or %WRITEMAP as these may be made
private at some point.
1) Use (and abuse) the 'custom' tag. The tagname for the object can differ from the
tagname used to store the object in the AnnotationCollection.
# AnnotationCollection from the SimpleAlign object
my $coll = $aln->annotation;
my $factory = Bio::Annotation::AnnotationFactory->new(-type =>
Bio::Annotation::SimpleValue');
my $rfann = $factory->create_object(-value => $str,
-tagname => 'mytag');
$coll->add_Annotation('custom', $rfann);
$rfann = $factory->create_object(-value => 'foo',
-tagname => 'bar');
$coll->add_Annotation('custom', $rfann);
OUTPUT:
# STOCKHOLM 1.0
#=GF ID myID12345
#=GF mytag katnayygqelggvnhdyddlakfyfgaglealdffnnkeaaakiinwvaEDTTRGKIQDLV??
#=GF mytag TPtd~????LDPETQALLV???????????????????????NAIYFKGRWE?????????~??
#=GF mytag ??HEF?A?EMDTKPY??DFQH?TNen?????GRI??????V???KVAM??MF?????????N??
#=GF mytag ???DD?VFGYAEL????DE???????L??D??????A??TALELAY??????????????????
#=GF mytag ?????????????KG??????Sa???TSMLILLP???????????????D??????????????
#=GF mytag ???????????EGTr?????AGLGKLLQ??QL????????SREef??DLNK??L???AH????R
#=GF mytag ????????????L????????????????????????????????????????R?????????R
#=GF mytag ??QQ???????V???????AVRLPKFSFefefdlkeplknlgmhqafdpnsdvfklmdqavlvi
#=GF mytag gdlqhayafkvd????????????????????????????????????????????????????
#=GF mytag ????????????????????????????????????????????????????????????????
#=GF mytag ????????????????????????????????????????????????????????????????
#=GF mytag ????????????????????????????????????????????????????????????????
#=GF mytag ?????????????INVDEAG?TEAAAATAAKFVPLSLppkt??????????????????PIEFV
#=GF mytag ADRPFAFAIR??????E?PAT?G????SILFIGHVEDPTP?msv?
#=GF bar foo
...
2) Modify the global @WRITEORDER and %WRITEMAP.
# AnnotationCollection from the SimpleAlign object
my $coll = $aln->annotation;
# add to WRITEORDER
my @order = @Bio::AlignIO::stockholm::WRITEORDER;
push @order, 'my_stuff';
@Bio::AlignIO::stockholm::WRITEORDER = @order;
# make sure new tag maps to something
$Bio::AlignIO::stockholm::WRITEMAP{my_stuff} = 'Hobbit/SimpleValue';
my $rfann = $factory->create_object(-value => 'Frodo',
-tagname => 'Hobbit');
$coll->add_Annotation('my_stuff', $rfann);
$rfann = $factory->create_object(-value => 'Bilbo',
-tagname => 'Hobbit');
$coll->add_Annotation('my_stuff', $rfann);
OUTPUT:
# STOCKHOLM 1.0
#=GF ID myID12345
#=GF Hobbit Frodo
#=GF Hobbit Bilbo
....
FEEDBACK
Support
Please direct usage questions or support issues to the mailing list:
bioperl-l@bioperl.org
rather than to the module maintainer directly. Many experienced and reponsive experts will
be able look at the problem and quickly address it. Please include a thorough description
of the problem with code and data examples if at all possible.
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:
https://redmine.open-bio.org/projects/bioperl/
AUTHORS - Chris Fields, Peter Schattner
Email: cjfields-at-uiuc-dot-edu, schattner@alum.mit.edu
CONTRIBUTORS
Andreas Kahari, ak-at-ebi.ac.uk Jason Stajich, jason-at-bioperl.org
APPENDIX
The rest of the documentation details each of the object methods. Internal methods are
usually preceded with a _
new
Title : new
Usage : my $alignio = Bio::AlignIO->new(-format => 'stockholm'
-file => '>file');
Function: Initialize a new L<Bio::AlignIO::stockholm> reader or writer
Returns : L<Bio::AlignIO> object
Args : -line_length : length of the line for the alignment block
-alphabet : symbol alphabet to set the sequences to. If not set,
the parser will try to guess based on the alignment
accession (if present), defaulting to 'dna'.
-spaces : (optional, def = 1) boolean to add a space in between
the "# STOCKHOLM 1.0" header and the annotation and
the annotation and the alignment.
next_aln
Title : next_aln
Usage : $aln = $stream->next_aln()
Function: returns the next alignment in the stream.
Returns : L<Bio::Align::AlignI> object
Args : NONE
write_aln
Title : write_aln
Usage : $stream->write_aln(@aln)
Function: writes the $aln object into the stream in stockholm format
Returns : 1 for success and 0 for error
Args : L<Bio::Align::AlignI> object
line_length
Title : line_length
Usage : $obj->line_length($newval)
Function: Set the alignment output line length
Returns : value of line_length
Args : newvalue (optional)
spaces
Title : spaces
Usage : $obj->spaces(1)
Function: Set the 'spaces' flag, which prints extra newlines between the
header and the annotation and the annotation and the alignment
Returns : sequence data type
Args : newvalue (optional)
alignhandler
Title : alignhandler
Usage : $stream->alignhandler($handler)
Function: Get/Set the Bio::HandlerBaseI object
Returns : Bio::HandlerBaseI
Args : Bio::HandlerBaseI