Bio::Assembly::IO phrap
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Summary
Bio::Assembly::IO::phrap - driver to load phrap.out files.
Package variables
No package variables defined.
Included modules
Bio::Assembly::Contig
Bio::Assembly::Scaffold
Bio::Assembly::Singlet
Bio::LocatableSeq
Bio::Seq
Bio::SeqFeature::Generic
Inherit
Bio::Assembly::IO
Synopsis
    # Building an input stream
use Bio::Assembly::IO;
# Assembly loading methods my $io = Bio::Assembly::IO->new( -file => 'results.phrap', -format => 'phrap'); # Read the entire scaffold my $scaffold = $io->next_assembly; # Or read one contig at a time to save resources while ( my $contig = $io->next_contig ) { # Do something ... }
Description
This package was developed to load the phrap.out files from the
(phred/phrap/consed) package by Phill Green. This files contain just
the messages printed to standard out by phrap when building an
assembly. This output is redirected by phredPhrap perl-script to a
file in the project's directory and hold some bit of information
regarding assembly quality, connections between contigs and clone's
position inside contigs. It should be noted that such files have no
data about the sequence. neither for contig consensus nor for any
aligned sequence. Anyway, such information may be loaded from Fasta
files in the projects directory and added to the assembly object
later.
Note that, because no sequence is loaded for the contig consensus and
locations for aligned sequences are only given in "ungapped consensus"
coordinates in a phrap.out file, you can't make coordinate changes in
assemblies loaded by pharp.pm, unless you add an aligned
coordinates for each sequence to each contig's features collection
yourself. See Bio::Assembly::Contig::Coordinate_Systems and
Bio::Assembly::Contig::Feature_collection..
This driver also loads singlets into the assembly contigs as
Bio::Assembly::Singlet objects, although without their sequence strings.
It also adds a feature for the entire sequence, thus storing the singlet
length in its end position, and adds a tag '_nof_trimmed_nonX' to the
feature, which stores the number of non-vector bases in the singlet. Assemblies are loaded into Bio::Assembly::Scaffold objects composed by
Bio::Assembly::Contig objects. No features are added to Bio::Assembly::Contig
"_aligned_coord:$seqID" feature class, therefore you can't make
coordinate changes in contigs loaded by this module. Contig objects
created by this module will have the following special feature
classes, identified by their primary tags, in their features
collection:
"_main_contig_feature:$ID" : main feature for contig $ID. This
feature is used to store information
about the entire consensus
sequence. This feature always start at
base 1 and its end position is the
consensus sequence length. A tag,
'trimmed_length' holds the length of the
trimmed good quality region inside the
consensus sequence.
"_covered_region:$index" : coordinates for valid clones inside the
contig. $index is the covered region
number, starting at 1 for the covered
region closest to the consensus sequence
first base.
"_unalign_coord:$seqID" : location of a sequence in "ungapped
consensus" coordinates (consensus
sequence without gaps). Primary and
secondary scores, indel and
substitutions statistics are stored as
feature tags.
"_internal_clones:$cloneID" : clones inside contigs $cloneID should be
used as the unique id for each
clone. These features have six tags:
'_1st_name', which is the id of the
upstream (5') aligned sequence
delimiting the clone; '_1st_strand', the
upstream sequence strand in the
alignment; '_2nd_name', downstream (3')
sequence id; '_2nd_strand', the
downstream sequence strand in the
alignment; '_length', unaligned clone
length; '_rejected', a boolean flag,
which is false if the clone is valid and
true if it was rejected.
All coordinates for the features above are expressed as "ungapped
consensus" coordinates (See Bio::Assembly::Contig::Coordinate_Systems.. #
Methods
next_assemblyDescriptionCode
next_contigDescriptionCode
scaffold_annotationsDescriptionCode
write_assemblyDescriptionCode
Methods description
next_assemblycode    nextTop
 Title   : next_assembly
Usage : $scaffold = $stream->next_assembly()
Function: returns the next assembly in the stream
Returns : a Bio::Assembly::Scaffold object
Args : none
next_contigcodeprevnextTop
 Title   : next_contig
Usage : $scaffold = $stream->next_contig()
Function: Returns the next contig or singlet in the PHRAP stream.
Returns : a Bio::Assembly::Contig or Bio::Assembly::Single object
Args : none
scaffold_annotationscodeprevnextTop
 Title   : scaffold_annotations
Usage : $stream->scaffold_annotations($scaffold)
Function: Adds ssembly and contig annotations to a scaffold. In the PHRAP
format, this is the section starting with "INTERNAL"
Returns : 1 for success
Args : a Bio::Assembly::Scaffold object to attach the annotations to
write_assembly (NOT IMPLEMENTED)codeprevnextTop
    Title   : write_assembly
Usage : $ass_io->write_assembly($assembly)
Function: Write the assembly object in Phrap compatible ACE format
Returns : 1 on success, 0 for error
Args : A Bio::Assembly::Scaffold object
Methods code
next_assemblydescriptionprevnextTop
sub next_assembly {
    my $self = shift;

    my $assembly = Bio::Assembly::Scaffold->new( -source => $progname );

    # Load contigs and singlets in the scaffold
while ( my $obj = $self->next_contig()) { # Add contig /singlet to assembly
if ($obj->isa('Bio::Assembly::Singlet')) { # a singlet
$assembly->add_singlet($obj); } else { # a contig
$assembly->add_contig($obj); } } # Load annotations of assembly and contigs
$self->scaffold_annotations($assembly); return $assembly;
}
next_contigdescriptionprevnextTop
sub next_contig {
  my $self = shift; # Package reference
# Looping over all phrap out file lines
my $contigOBJ; while ($_ = $self->_readline) { chomp; # Loading singlets reads data
#/^(\d+) isolated singlet/ && do { # should it match 'singlets' and 'singletons'?
# while ($_ = $self->_readline) {
# chomp;
# last if (/^$/);
/^\s+(\S+)\s+(\d+)\s+\((\d+)\)/ && do { my ($singletID, $length, $nof_trimmed_nonX) = ($1, $2, $3); # Create singlet object, and add it to scaffold
my $seq = Bio::LocatableSeq->new( -id => $singletID, -primary_id => $singletID, -start => 1, -end => $length, -strand => 1, -nowarnonempty => 1, -alphabet => 'dna' ); $contigOBJ = Bio::Assembly::Singlet->new( -id => $singletID, -seqref => $seq, -verbose => $self->verbose ); my $feat = Bio::SeqFeature::Generic->new( -start => 1, -end => $length, -primary => "_main_contig_feature", -source => $contigOBJ->id, -tag => { '_nof_trimmed_nonX' => $nof_trimmed_nonX } ); $contigOBJ->add_features([ $feat ],1); # Go to return statement
last; }; # }
#};
# Loading contig information
/^Contig (\d+)\.\s+(\d+) reads?; (\d+) bp \(untrimmed\), (\d+) \(trimmed\)\./ && do { my ($contigID, $nof_reads, $length, $trimmed_length) = ($1, $2, $3, $4); $contigOBJ = Bio::Assembly::Contig->new( -id => $contigID, -verbose => $self->verbose, -source => 'phrap' ); my $feat = Bio::SeqFeature::Generic->new( -start => 1, -end => $length, -primary => "_main_contig_feature", -source => $contigOBJ->id, -tag => { '_trimmed_length' => $trimmed_length } ); $contigOBJ->add_features([ $feat ],1); }; # Loading read information
/^(C?)\s+(-?\d+)\s+(\d+)\s+(\S+)\s+(\d+)\s+\(\s*(\d+)\)\s+(\d+\.\d*)\s+(\d+\.\d*)\s+(\d+\.\d*)/ && do { my ($strand, $start, $end, $readID, $primary_score, $secondary_score, $substitutions, $deletions, $insertions) = ($1, $2, $3, $4, $5, $6, $7, $8, $9); $strand = ($strand eq 'C' ? -1 : 1); my $seq = Bio::LocatableSeq->new( -start => $start, -end => $end, -nowarnonempty => 1, -strand => $strand, -id => $readID, -primary_id => $readID, -alphabet => 'dna'); my $unalign_coord = Bio::SeqFeature::Generic->new( -start => $start, -end => $end, -primary => "_unalign_coord", -source => $readID, -tag => {'_primary_score'=>$primary_score, '_secondary_score'=>$secondary_score, '_substitutions'=>$substitutions, '_insertions'=>,$insertions, '_deletions'=>$deletions } ); $unalign_coord->attach_seq($seq); $contigOBJ->add_seq($seq); $contigOBJ->add_features([ $unalign_coord ]); }; /^$/ && do { # blank line, could be the end of a contig
if ($contigOBJ) { # Go to the return statement
last; } }; } # while ($_ = $self->_readline)
return $contigOBJ;
}
scaffold_annotationsdescriptionprevnextTop
sub scaffold_annotations {
    my ($self, $assembly) = @_;

    # Read the PHRAP stream from the beginning again
seek($self->_fh, 0, 0); while ($_ = $self->_readline) { chomp; # Loading exact dupicated reads list
# /Exact duplicate reads:/ && do {
# my @exact_dupl;
# while (<FILE>) {
# last if (/^\s*$/);
# /(\S+)\s+(\S+)/ && do {
# push(@exact_dupl,[$1,$2]);
# };
# $self->{'assembly'}{'exact_dupl_reads'} =
# new Data::Table(\@exact_dupl,['included','excluded'],0);
# }
# };
# Loading INTERNAL clones description
/INTERNAL\s+Contig\s+(\d+)\s+opp\s+sense/ && do { my $contigID = $1; my $contig = $assembly->get_contig_by_id($contigID) || $assembly->get_singlet_by_id($contigID); while ($_ = $self->_readline) { my (@data,$rejected,$c1_strand,$c2_strand); (@data = /\s+(\*?)\s+(C?)\s+(\S+)\s+(C?)\s+(\S+)\s+(-?\d+)\s+(-?\d+)\s+(-?\d+)/) && do { if ($data[0] eq '*') { $rejected = 1 } else { $rejected = 0 } $c1_strand = ($data[1] eq 'C' ? -1 : 1); $c2_strand = ($data[3] eq 'C' ? -1 : 1); (my $clone_name = $data[2]) =~ s/^(\S+)\.\w.*/$1/; my $clone = Bio::SeqFeature::Generic->new( -start => $data[6], -end => $data[7], -strand => 0, -primary => "_internal_clone", -source => $clone_name, -tag => {'_1st_strand'=>,$c1_strand, '_2nd_strand'=>,$c2_strand, '_1st_name'=>$data[2], '_2nd_name'=>$data[4], '_length'=>$data[5], '_rejected'=>$rejected} ); $contig->add_features([ $clone ]); }; /Covered regions:/ && do { my %coord = /(\d+)/g; my $i = 0; foreach my $start (sort { $a <=> $b } keys %coord) { my $cov = Bio::SeqFeature::Generic->new( -start => $start, -end => $coord{$start}, -primary => '_covered_region', -source => ++$i, ); # 1: attach feature to contig consensus, if any
$contig->add_features([ $cov ],1); } last; # exit while loop
}; # /Covered regions:/
} # while ($_ = $self->_readline)
}; # /INTERNAL\s+Contig\s+(\d+)\s+opp\s+sense/
} # while ($_ = $self->_readline)
return 1;
}
write_assemblydescriptionprevnextTop
sub write_assembly {
    my $self = shift;
    $self->throw_not_implemented();   
}

1;

__END__
}
General documentation
FEEDBACKTop
Mailing ListsTop
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably to 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
Support Top
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 BugsTop
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/
AUTHOR - Robson Francisco de SouzaTop
Email rfsouza@citri.iq.usp.br
head1 APPENDIX
The rest of the documentation details each of the object
methods. Internal methods are usually preceded with a _
Parser methodsTop