Bio::Tools
Lucy
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Summary
Bio::Tools::Lucy - Object for analyzing the output from Lucy,
a vector and quality trimming program from TIGR
Package variables
No package variables defined.
Included modules
Inherit
Synopsis
# Create the Lucy object from an existing Lucy output file
@params = ('seqfile' => 'lucy.seq', 'lucy_verbose' => 1);
$lucyObj = Bio::Tools::Lucy->new(@params);
# Get names of all sequences
$names = $lucyObj->get_sequence_names();
# Print seq and qual values for sequences >400 bp in order to run CAP3
foreach $name (@$names) {
next unless $lucyObj->length_clear($name) > 400;
print SEQ ">$name\n", $lucyObj->sequence($name), "\n";
print QUAL ">$name\n", $lucyObj->quality($name), "\n";
}
# Get an array of Bio::PrimarySeq objects
@seqObjs = $lucyObj->get_Seq_Objs();
Description
Bio::Tools::Lucy.pm provides methods for analyzing the sequence and
quality values generated by Lucy program from TIGR.
Lucy will identify vector, poly-A/T tails, and poor quality regions in
a sequence. (www.genomics.purdue.edu/gcg/other/lucy.pdf)
The input to Lucy can be the Phred sequence and quality files
generated from running Phred on a set of chromatograms.
Lucy can be obtained (free of charge to academic users) from
www.tigr.org/softlab
There are a few methods that will only be available if you make some
minor changes to the source for Lucy and then recompile. The changes
are in the 'lucy.c' file and there is a diff between the original and
the modified file in the Appendix
Please contact the author of this module if you have any problems
making these modifications.
You do not have to make these modifications to use this module.
@params = ('seqfile' => 'lucy.seq', 'adv_stderr' => 1,
'fwd_desig' => '_F', 'rev_desig' => '_R');
$lucyObj = Bio::Tools::Lucy->new(@params);
You should get an array with the sequence names in order to use
accessor methods. Note: The Lucy binary program will fail unless
the sequence names provided as input are unique.
$names_ref = $lucyObj->get_sequence_names();
This code snippet will produce a Fasta format file with sequence
lengths and %GC in the description line.
foreach $name (@$names) {
print FILE ">$name\t",
$lucyObj->length_clear($name), "\t",
$lucyObj->per_GC($name), "\n",
$lucyObj->sequence($name), "\n";
}
Print seq and qual values for sequences >400 bp in order to assemble
them with CAP3 (or other assembler).
foreach $name (@$names) {
next unless $lucyObj->length_clear($name) > 400;
print SEQ ">$name\n", $lucyObj->sequence($name), "\n";
print QUAL ">$name\n", $lucyObj->quality($name), "\n";
}
Get all the sequences as Bio::PrimarySeq objects (eg., for use with
Bio::Tools::Blast to perform BLAST).
@seqObjs = $lucyObj->get_Seq_Objs();
Or use only those sequences that are full length and have a Poly-A
tail.
foreach $name (@$names) {
next unless ($lucyObj->full_length($name) and $lucy->polyA($name));
push @seqObjs, $lucyObj->get_Seq_Obj($name);
}
Get the names of those sequences that were rejected by Lucy.
$rejects_ref = $lucyObj->get_rejects();
Print the names of the rejects and 1 letter code for reason they
were rejected.
foreach $key (sort keys %$rejects_ref) {
print "$key: ", $rejects_ref->{$key};
}
There is a lot of other information available about the sequences
analyzed by Lucy (see APPENDIX). This module can be used with the
DBI module to store this sequence information in a database.
Methods
Methods description
Title : _parse Usage : n/a (internal function) Function: called by new() to parse Lucy output files Returns : nothing Args : none |
Title : avg_quality Usage : $lucyObj->avg_quality($seqname) Function: returns the average quality value for one of the sequences analyzed by Lucy. Returns : float Args : name of a sequence |
Title : direction Usage : $lucyObj->direction($seqname) Function: returns the direction for one of the sequences analyzed by Lucy providing that 'fwd_desig' or 'rev_desig' were set when the Lucy object was created. Strings returned are: 'F' for forward, 'R' for reverse. Returns : string Args : name of a sequence |
Title : end_clear Usage : $lucyObj->end_clear($seqname) Function: returns the ending position of good quality, vector free DNA sequence determined by Lucy. Returns : integer Args : name of a sequence |
Title : full_length Usage : $lucyObj->full_length($seqname) Function: returns the truth value for whether or not the sequence read was full length (ie. vector present on both ends of read). This method depends on the user having provided the 'info' file (Lucy must be run with the -debug 'info_filename' option to get this file). Returns : boolean Args : name of a sequence |
Title : get_Seq_Obj Usage : $lucyObj->get_Seq_Obj($seqname) Function: returns reference to a Bio::PrimarySeq object where -id = 'sequence name' and -seq = 'sequence' Returns : reference to Bio::PrimarySeq object Args : name of a sequence |
Title : get_Seq_Objs Usage : $lucyObj->get_Seq_Objs() Function: returns an array of references to Bio::PrimarySeq objects where -id = 'sequence name' and -seq = 'sequence'
Returns : array of Bio::PrimarySeq objects
Args : none |
Title : get_rejects Usage : $lucyObj->get_rejects() Function: returns a hash containing names of rejects and a 1 letter code for the reason Lucy rejected the sequence. Q- rejected because of low quality values S- sequence was short V- sequence was vector E- sequence was empty P- poly-A/T trimming caused sequence to be too short In order to get the rejects, you must provide a file with the standard error from Lucy. You will only get the quality category rejects unless you have modified the source and recompiled Lucy as outlined in DESCRIPTION. Returns : hash reference Args : none |
Title : get_sequence_names Usage : $lucyObj->get_sequence_names Function: returns reference to an array of names of the sequences analyzed by Lucy. These names are required for most of the accessor methods. Note: The Lucy binary will fail unless sequence names are unique. Returns : array reference Args : none |
Title : length_clear Usage : $lucyObj->length_clear($seqname) Function: returns the length of a DNA sequence following quality/ vector trimming by Lucy. Returns : integer Args : name of a sequence |
Title : length_raw Usage : $lucyObj->length_raw($seqname) Function: returns the length of a DNA sequence prior to quality/ vector trimming by Lucy. Returns : integer Args : name of a sequence |
Title : new Usage : $lucyObj = Bio::Tools::Lucy->new(seqfile => lucy.seq, rev_desig => '_R', fwd_desig => '_F') Function: creates a Lucy object from Lucy analysis files Returns : reference to Bio::Tools::Lucy object Args : seqfile Fasta sequence file generated by Lucy qualfile Quality values file generated by Lucy infofile Info file created when Lucy is run with -debug 'infofile' option stderrfile Standard error captured from Lucy when Lucy is run with -info option and STDERR is directed to stderrfile (ie. lucy ... 2> stderrfile). Info in this file will include sequences dropped for low quality. If you've modified Lucy source (see adv_stderr below), it will also include info on which sequences were dropped because they were vector, too short, had no insert, and whether a poly-A tail was found (if Lucy was run with -cdna option). lucy_verbose verbosity level (0-1). fwd_desig The string used to determine whether sequence is a forward read. The parser will assume that this match will occus at the end of the sequence name string. rev_desig As above, for reverse reads. adv_stderr Can be set to a true value (1). Will only work if you have modified the Lucy source code as outlined in DESCRIPTION and capture the standard error from Lucy.
If you don't provide filenames for qualfile, infofile or stderrfile, the module will assume that .qual, .info, and .stderr are the file extensions and search in the same directory as the .seq file for these files. For example, if you create a Lucy object with $lucyObj = Bio::Tools::Lucy->new(seqfile =>lucy.seq), the module will find lucy.qual, lucy.info and lucy.stderr. You can omit any or all of the quality, info or stderr files, but you will not be able to use all of the object methods (see method documentation below). |
Title : per_GC Usage : $lucyObj->per_GC($seqname) Function: returns the percente of the good quality, vector free DNA sequence determined by Lucy. Returns : float Args : name of a sequence |
Title : polyA Usage : $lucyObj->polyA($seqname) Function: returns the truth value for whether or not a poly-A tail was detected and clipped by Lucy. This method depends on the user having modified the source for Lucy as outlined in DESCRIPTION and invoking Lucy with the -cdna option and saving the standard error. Note, the final sequence will not show the poly-A/T region. Returns : boolean Args : name of a sequence |
Title : quality Usage : $lucyObj->quality($seqname) Function: returns the quality values of one of the sequences analyzed by Lucy. This method depends on the user having provided a quality file. Returns : string Args : name of a sequence |
Title : sequence Usage : $lucyObj->sequence($seqname) Function: returns the DNA sequence of one of the sequences analyzed by Lucy. Returns : string Args : name of a sequence |
Title : start_clear Usage : $lucyObj->start_clear($seqname) Function: returns the beginning position of good quality, vector free DNA sequence determined by Lucy. Returns : integer Args : name of a sequence |
Methods code
sub AUTOLOAD
{ my $self = shift;
my $attr = $AUTOLOAD;
$attr =~ s/.*:://;
$attr = lc $attr;
$self->throw("Unallowed parameter: $attr !") unless $OK_FIELD{$attr};
$self->{$attr} = shift if @_;
return $self->{$attr}; } |
sub _parse
{ my $self = shift;
$self->{seqfile} =~ /^(\S+)\.\S+$/;
my $file = $1;
print "Opening $self->{seqfile} for parsing...\n" if $self->{lucy_verbose};
open SEQ, "$self->{seqfile}" or $self->throw("Could not open sequence file: $self->{seqfile}");
my ($name, $line);
my $seq = "";
my @lines = <SEQ>;
while ($line = pop @lines) {
chomp $line;
if ($line =~ /^>(\S+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)/) {
$name = $1;
if ($self->{fwd_desig}) {
$self->{sequences}{$name}{direction} = "F" if $name =~ /^(\S+)($self->{fwd_desig})$/;
}
if ($self->{rev_desig}) {
$self->{sequences}{$name}{direction} = "R" if $name =~ /^(\S+)($self->{rev_desig})$/;
}
$self->{sequences}{$name}{min_clone_len} = $2; $self->{sequences}{$name}{max_clone_len} = $3;
$self->{sequences}{$name}{med_clone_len} = $4;
$self->{sequences}{$name}{beg_clear} = $5;
$self->{sequences}{$name}{end_clear} = $6;
$self->{sequences}{$name}{length_raw} = $seq =~ tr/[AGCTN]//; my $beg = $5-1; $seq = $self->{sequences}{$name}{sequence} = substr ($seq, $beg, $6-$beg);
my $count = $self->{sequences}{$name}{length_clear} = $seq =~ tr/[AGCTN]//;
my $countGC = $seq =~ tr/[GC]//;
$self->{sequences}{$name}{per_GC} = $countGC/$count * 100; $seq = "";
}
else {
$seq = $line.$seq;
}
}
if ($self->{qualfile}) {
open QUAL, "$self->{qualfile}" or $self->throw("Could not open quality file: $self->{qualfile}");
@lines = <QUAL>;
}
elsif (-e "$file.qual") {
print "You did not set qualfile, but I'm opening $file.qual\n" if $self->{lucy_verbose};
$self->qualfile("$file.qual");
open QUAL, "$file.qual" or $self->throw("Could not open quality file: $file.qual");
@lines = <QUAL>;
}
else {
print "I did not find a quality file. You will not be able to use all of the accessor methods.\n" if $self->{lucy_verbose};
@lines = ();
}
my (@vals, @slice, $num, $tot, $vals);
my $qual = "";
while ($line = pop @lines) {
chomp $line;
if ($line =~ /^>(\S+)/) {
$name = $1;
@vals = split /\s/ , $qual;
@slice = @vals[$self->{sequences}{$name}{beg_clear} .. $self->{sequences}{$name}{end_clear}];
$vals = join "\t", @slice;
$self->{sequences}{$name}{quality} = $vals;
$qual = "";
foreach $num (@slice) {
$tot += $num;
}
$num = @slice;
$self->{sequences}{$name}{avg_quality} = $tot/$num; $tot = 0;
}
else {
$qual = $line.$qual;
}
}
if ($self->{infofile}) {
open INFO, "$self->{infofile}" or $self->throw("Could not open info file: $self->{infofile}");
@lines = <INFO>;
}
elsif (-e "$file.info") {
print "You did not set infofile, but I'm opening $file.info\n" if $self->{lucy_verbose};
$self->infofile("$file.info");
open INFO, "$file.info" or $self->throw("Could not open info file: $file.info");
@lines = <INFO>;
}
else {
print "I did not find an info file. You will not be able to use all of the accessor methods.\n" if $self->{lucy_verbose};
@lines = ();
}
foreach (@lines) {
/^(\S+).+CLV\s+(\d+)\s+(\d+)$/;
if ($2>0 && $3>0) {
$self->{sequences}{$1}{full_length} = 1 if $self->{sequences}{$1}; }
}
if ($self->{stderrfile}) {
open STDERR_LUCY, "$self->{stderrfile}" or $self->throw("Could not open quality file: $self->{stderrfile}");
@lines = <STDERR_LUCY>;
}
elsif (-e "$file.stderr") {
print "You did not set stderrfile, but I'm opening $file.stderr\n" if $self->{lucy_verbose};
$self->stderrfile("$file.stderr");
open STDERR_LUCY, "$file.stderr" or $self->throw("Could not open quality file: $file.stderr");
@lines = <STDERR_LUCY>;
}
else {
print "I did not find a standard error file. You will not be able to use all of the accessor methods.\n" if $self->{lucy_verbose};
@lines = ();
}
if ($self->{adv_stderr}) {
foreach (@lines) {
$self->{reject}{$1} = "Q" if /dropping\s+(\S+)/;
$self->{reject}{$1} = "V" if /Vector: (\S+)/;
$self->{reject}{$1} = "E" if /Empty: (\S+)/;
$self->{reject}{$1} = "S" if /Short: (\S+)/;
$self->{sequences}{$1}{polyA} = 1 if /(\S+) has PolyA/;
if (/Dropped PolyA: (\S+)/) {
$self->{reject}{$1} = "P";
delete $self->{sequences}{$1};
}
}
}
else {
foreach (@lines) {
$self->{reject}{$1} = "R" if /dropping\s+(\S+)/;
}
} } |
sub avg_quality
{ my($self, $key) = @_;
return $self->{sequences}{$key}{avg_quality}; } |
sub direction
{ my($self, $key) = @_;
return $self->{sequences}{$key}{direction} if $self->{sequences}{$key}{direction};
return ""; } |
sub end_clear
{ my($self, $key) = @_;
return $self->{sequences}{$key}{end_clear}; } |
sub full_length
{ my($self, $key) = @_;
return 1 if $self->{sequences}{$key}{full_length};
return 0; } |
sub get_Seq_Obj
{ my ($self, $key) = @_;
my $seqobj = Bio::PrimarySeq->new( -seq => "$self->{sequences}{$key}{sequence}",
-id => "$key");
return $seqobj; } |
sub get_Seq_Objs
{ my $self = shift;
my($seqobj, @seqobjs);
foreach my $key (sort keys %{$self->{sequences}}) {
$seqobj = Bio::PrimarySeq->new( -seq => "$self->{sequences}{$key}{sequence}",
-id => "$key");
push @seqobjs, $seqobj;
}
return\@ seqobjs; } |
sub get_rejects
{ my $self = shift;
return $self->{reject}; } |
sub get_sequence_names
{ my $self = shift;
my @keys = sort keys %{$self->{sequences}};
return\@ keys; } |
sub length_clear
{ my($self, $key) = @_;
return $self->{sequences}{$key}{length_clear}; } |
sub length_raw
{ my($self, $key) = @_;
return $self->{sequences}{$key}{length_raw}; } |
sub new
{ my ($class,@args) = @_;
my $self = $class->SUPER::new(@args);
my ($attr, $value);
while (@args) {
$attr = shift @args;
$attr = lc $attr;
$value = shift @args;
$self->{$attr} = $value;
}
&_parse($self);
return $self; } |
sub per_GC
{ my($self, $key) = @_;
return $self->{sequences}{$key}{per_GC}; } |
sub polyA
{ my($self, $key) = @_;
return 1 if $self->{sequences}{$key}{polyA};
return 0; } |
sub quality
{ my($self, $key) = @_;
return $self->{sequences}{$key}{quality}; } |
sub sequence
{ my ($self, $key) = @_;
return $self->{sequences}{$key}{sequence}; } |
sub start_clear
{ my($self, $key) = @_;
return $self->{sequences}{$key}{beg_clear}; } |
General documentation
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://bio.perl.org/MailList.html - About the mailing lists
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://bugzilla.bioperl.org/
Methods available to Lucy objects are described below. Please note
that any method beginning with an underscore is considered internal
and should not be called directly.
Diff for Lucy source code | Top |
352a353,354
> /* AGW added next line */
> fprintf(stderr, "Empty: %s\n", seqs[i].name);
639a642,643
> /* AGW added next line */
> fprintf(stderr, "Short/ no insert: %s\n", seqs[i].name);
678c682,686
< if (left) seqs[i].left+=left;
---
> if (left) {
> seqs[i].left+=left;
> /* AGW added next line */
> fprintf(stderr, "%s has PolyA (left).\n", seqs[i].name);
> }
681c689,693
< if (right) seqs[i].right-=right;
---
> if (right) {
> seqs[i].right-=right;
> /* AGW added next line */
> fprintf(stderr, "%s has PolyA (right).\n", seqs[i].name);
> }
682a695,696
> /* AGW added next line */
> fprintf(stderr, "Dropped PolyA: %s\n", seqs[i].name);
734a749,750
> /* AGW added next line */
> fprintf(stderr, "Vector: %s\n", seqs[i].name);