Bio::Align
AlignI
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Summary
Bio::Align::AlignI - An interface for describing sequence alignments.
Package variables
No package variables defined.
Included modules
Inherit
Synopsis
# get a Bio::Align::AlignI somehow - typically using Bio::AlignIO system
# some descriptors
print $aln->length, "\n";
print $aln->no_residues, "\n";
print $aln->is_flush, "\n";
print $aln->no_sequences, "\n";
print $aln->percentage_identity, "\n";
print $aln->consensus_string(50), "\n";
# find the position in the alignment for a sequence location
$pos = $aln->column_from_residue_number('1433_LYCES', 14); # = 6;
# extract sequences and check values for the alignment column $pos
foreach $seq ($aln->each_seq) {
$res = $seq->subseq($pos, $pos);
$count{$res}++;
}
foreach $res (keys %count) {
printf "Res: %s Count: %2d\n", $res, $count{$res};
}
Description
This interface describes the basis for alignment objects.
Methods
Methods description
Title : add_seq
Usage : $myalign->add_seq($newseq);
Function : Adds another sequence to the alignment. *Does not* align
it - just adds it to the hashes.
Returns : nothing
Argument : a Bio::LocatableSeq object
order (optional)
See Bio::LocatableSeq for more information. |
Title : average_percentage_identity
Usage : $id = $align->average_percentage_identity
Function: The function uses a fast method to calculate the average
percentage identity of the alignment
Returns : The average percentage identity of the alignment
Args : None |
Title : column_from_residue_number
Usage : $col = $ali->column_from_residue_number( $seqname, $resnumber)
Function:
This function gives the position in the alignment
(i.e. column number) of the given residue number in the
sequence with the given name. For example, for the
alignment
Seq1/91-97 AC..DEF.GH
Seq2/24-30 ACGG.RTY..
Seq3/43-51 AC.DDEFGHI
column_from_residue_number( "Seq1", 94 ) returns 5.
column_from_residue_number( "Seq2", 25 ) returns 2.
column_from_residue_number( "Seq3", 50 ) returns 9.
An exception is thrown if the residue number would lie
outside the length of the aligment
(e.g. column_from_residue_number( "Seq2", 22 )
Note: If the the parent sequence is represented by more than
one alignment sequence and the residue number is present in
them, this method finds only the first one.
Returns : A column number for the position in the alignment of the
given residue in the given sequence (1 = first column)
Args : A sequence id/name (not a name/start-end)
A residue number in the whole sequence (not just that
segment of it in the alignment) |
Title : consensus_iupac
Usage : $str = $ali->consensus_iupac()
Function :
Makes a consensus using IUPAC ambiguity codes from DNA
and RNA. The output is in upper case except when gaps in
a column force output to be in lower case.
Note that if your alignment sequences contain a lot of
IUPAC ambiquity codes you often have to manually set
alphabet. Bio::PrimarySeq::_guess_type thinks they
indicate a protein sequence.
Returns : consensus string
Argument : none
Throws : on protein sequences |
Title : consensus_string
Usage : $str = $ali->consensus_string($threshold_percent)
Function : Makes a strict consensus
Returns :
Argument : Optional treshold ranging from 0 to 100.
The consensus residue has to appear at least threshold %
of the sequences at a given location, otherwise a '?'
character will be placed at that location.
(Default value = 0%) |
Title : displayname
Usage : $myalign->displayname("Ig", "IgA")
Function : Gets/sets the display name of a sequence in the alignment
:
Returns : A display name string
Argument : name of the sequence
displayname of the sequence (optional) |
Title : each_alphabetically
Usage : foreach $seq ( $ali->each_alphabetically() )
Function :
Returns an array of sequence object sorted alphabetically
by name and then by start point.
Does not change the order of the alignment
Returns :
Argument : |
Title : each_seq
Usage : foreach $seq ( $align->each_seq() )
Function : Gets an array of Seq objects from the alignment
Returns : an array
Argument : |
Title : each_seq_with_id
Usage : foreach $seq ( $align->each_seq_with_id() )
Function :
Gets an array of Seq objects from the
alignment, the contents being those sequences
with the given name (there may be more than one)
Returns : an array
Argument : a seq name |
Title : gap_char
Usage : $myalign->gap_char('-')
Function : Gets/sets the gap_char attribute of the alignment
Returns : An gap_char string, defaults to '-'
Argument : An gap_char string (optional) |
Title : get_seq_by_pos
Usage : $seq = $aln->get_seq_by_pos(3) # third sequence from the alignment
Function :
Gets a sequence based on its position in the alignment.
Numbering starts from 1. Sequence positions larger than
no_sequences() will thow an error.
Returns : a Bio::LocatableSeq object
Argument : positive integer for the sequence osition |
Title : id
Usage : $myalign->id("Ig")
Function : Gets/sets the id field of the alignment
Returns : An id string
Argument : An id string (optional) |
Title : is_flush
Usage : if( $ali->is_flush() )
:
:
Function : Tells you whether the alignment
: is flush, ie all of the same length
:
:
Returns : 1 or 0
Argument : |
Title : length()
Usage : $len = $ali->length()
Function : Returns the maximum length of the alignment.
To be sure the alignment is a block, use is_flush
Returns :
Argument : |
Title : map_chars
Usage : $ali->map_chars('\.','-')
Function :
Does a s/$arg1/$arg2/ on the sequences. Useful for gap
characters
Notice that the from (arg1) is interpretted as a regex,
so be careful about quoting meta characters (eg
$ali->map_chars('.','-') wont do what you want)
Returns :
Argument : 'from' rexexp
'to' string |
Title : match()
Usage : $ali->match()
Function :
Goes through all columns and changes residues that are
identical to residue in first sequence to match '.'
character. Sets match_char.
USE WITH CARE: Most MSE formats do not support match
characters in sequences, so this is mostly for output
only. NEXUS format (Bio::AlignIO::nexus) can handle
it.
Returns : 1
Argument : a match character, optional, defaults to '.' |
Title : match_char
Usage : $myalign->match_char('.')
Function : Gets/sets the match_char attribute of the alignment
Returns : An match_char string,
Argument : An match_char string (optional) |
Title : match_line()
Usage : $align->match_line()
Function : Generates a match line - much like consensus string
except that a line indicating the '*' for a match.
Argument : (optional) Match line characters ('*' by default)
(optional) Strong match char (':' by default)
(optional) Weak match char ('.' by default) |
Title : missing_char
Usage : $myalign->missing_char("?")
Function : Gets/sets the missing_char attribute of the alignment
It is generally recommended to set it to 'n' or 'N'
for nucleotides and to 'X' for protein.
Returns : An missing_char string,
Argument : An missing_char string (optional) |
Title : no_residues
Usage : $no = $ali->no_residues
Function : number of residues in total in the alignment
Returns : integer
Argument : |
Title : no_sequences
Usage : $depth = $ali->no_sequences
Function : number of sequence in the sequence alignment
Returns : integer
Argument : None |
Title : percentage_identity
Usage : $id = $align->percentage_identity
Function: The function calculates the percentage identity of
the conserved columns
Returns : The percentage identity of the conserved columns
Args : None |
Title : percentage_identity
Usage : $id = $align->percentage_identity
Function: The function calculates the percentage identity of the alignment
Returns : The percentage identity of the alignment (as defined by the
implementation)
Argument: None |
Title : purge
Usage : $aln->purge(0.7);
Function:
Removes sequences above whatever %id.
This function will grind on large alignments. Beware!
(perhaps not ideally implemented)
Example :
Returns : An array of the removed sequences
Argument: |
Title : remove_seq
Usage : $aln->remove_seq($seq);
Function : Removes a single sequence from an alignment
Returns :
Argument : a Bio::LocatableSeq object |
Title : select
Usage : $aln2 = $aln->select(1, 3) # three first sequences
Function :
Creates a new alignment from a continuous subset of
sequences. Numbering starts from 1. Sequence positions
larger than no_sequences() will thow an error.
Returns : a Bio::SimpleAlign object
Argument : positive integer for the first sequence
positive integer for the last sequence to include (optional) |
Title : select_noncont
Usage : $aln2 = $aln->select_noncont(1, 3) # first and 3rd sequences
Function :
Creates a new alignment from a subset of
sequences. Numbering starts from 1. Sequence positions
larger than no_sequences() will thow an error.
Returns : a Bio::SimpleAlign object
Args : array of integers for the sequences |
Title : set_displayname_count
Usage : $ali->set_displayname_count
Function :
Sets the names to be name_# where # is the number of
times this name has been used.
Returns : None
Argument : None |
Title : set_displayname_flat
Usage : $ali->set_displayname_flat()
Function : Makes all the sequences be displayed as just their name,
not name/start-end
Returns : 1
Argument : None |
Title : set_displayname_normal
Usage : $ali->set_displayname_normal()
Function : Makes all the sequences be displayed as name/start-end
Returns : None
Argument : None |
Title : slice
Usage : $aln2 = $aln->slice(20, 30)
Function :
Creates a slice from the alignment inclusive of start and
end columns. Sequences with no residues in the slice are
excluded from the new alignment and a warning is printed.
Slice beyond the length of the sequence does not do
padding.
Returns : a Bio::SimpleAlign object
Argument : positive integer for start column
positive integer for end column |
Title : sort_alphabetically
Usage : $ali->sort_alphabetically
Function :
Changes the order of the alignemnt to alphabetical on name
followed by numerical by number.
Returns :
Argument : |
Title : symbol_chars
Usage : my @symbolchars = $aln->symbol_chars;
Function: Returns all the seen symbols (other than gaps)
Returns : array of characters that are the seen symbols
Argument: boolean to include the gap/missing/match characters |
Title : unmatch()
Usage : $ali->unmatch()
Function :
Undoes the effect of method match. Unsets match_char.
Returns : 1
Argument : a match character, optional, defaults to '.' |
Title : uppercase()
Usage : $ali->uppercase()
Function : Sets all the sequences to uppercase
Returns :
Argument : |
Methods code
sub add_seq
{ my ($self) = @_;
$self->throw_not_implemented();} | sub average_percentage_identity
{ my ($self) = @_;
$self->throw_not_implemented();} | sub column_from_residue_number
{ my ($self) = @_;
$self->throw_not_implemented();} | sub consensus_iupac
{ my ($self) = @_;
$self->throw_not_implemented();} | sub consensus_string
{ my ($self) = @_;
$self->throw_not_implemented();} | sub displayname
{ my ($self) = @_;
$self->throw_not_implemented();} | sub each_alphabetically
{ my($self) = @_;
$self->throw_not_implemented();} | sub each_seq
{ my ($self) = @_;
$self->throw_not_implemented();} | sub each_seq_with_id
{ my ($self) = @_;
$self->throw_not_implemented();} | sub gap_char
{ my ($self) = @_;
$self->throw_not_implemented();} | sub get_seq_by_pos
{ my ($self) = @_;
$self->throw_not_implemented();} | sub id
{ my ($self) = @_;
$self->throw_not_implemented();} | sub is_flush
{ my ($self) = @_;
$self->throw_not_implemented();} | sub length
{ my ($self) = @_;
$self->throw_not_implemented();} | sub map_chars
{ my ($self) = @_;
$self->throw_not_implemented();} | sub match
{ my ($self) = @_;
$self->throw_not_implemented();} | sub match_char
{ my ($self) = @_;
$self->throw_not_implemented();} | sub match_line
{ my ($self) = @_;
$self->throw_not_implemented();} | sub maxname_length
{ my ($self) = @_;
$self->throw_not_implemented();} | sub missing_char
{ my ($self) = @_;
$self->throw_not_implemented();} | sub no_residues
{ my ($self) = @_;
$self->throw_not_implemented();} | sub no_sequences
{ my ($self) = @_;
$self->throw_not_implemented();} | sub overall_percentage_identity
{ my ($self) = @_;
$self->throw_not_implemented();} | sub percentage_identity
{ my ($self) = @_;
$self->throw_not_implemeneted();} | sub purge
{ my ($self) = @_;
$self->throw_not_implemented();} | sub remove_seq
{ my ($self) = @_;
$self->throw_not_implemented();} | sub select
{ my ($self) = @_;
$self->throw_not_implemented();} | sub select_noncont
{ my ($self) = @_;
$self->throw_not_implemented();} | sub set_displayname_count
{ my ($self) = @_;
$self->throw_not_implemented();} | sub set_displayname_flat
{ my ($self) = @_;
$self->throw_not_implemented();} | sub set_displayname_normal
{ my ($self) = @_;
$self->throw_not_implemented();
}
1;} | sub slice
{ my ($self) = @_;
$self->throw_not_implemented();} | sub sort_alphabetically
{ my ($self) = @_;
$self->throw_not_implemented();} | sub symbol_chars
{ my ($self) = @_;
$self->throw_not_implemented();} | sub unmatch
{ my ($self) = @_;
$self->throw_not_implemented();} | sub uppercase
{ my ($self) = @_;
$self->throw_not_implemented();} | General documentation
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 list. Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion
http://bioperl.org/MailList.shtml - About the mailing lists
Report bugs to the Bioperl bug tracking system to help us keep track
of the bugs and their resolution. Bug reports can be submitted via
email or the web:
bioperl-bugs@bioperl.org
http://bugzilla.bioperl.org/
| AUTHOR - Jason Stajich | Top |
The rest of the documentation details each of the object methods.
Internal methods are usually preceded with a _
These methods modify the MSE by adding, removing or shuffling complete
sequences.
| Sequence selection methods | Top |
Methods returning one or more sequences objects.
The result of these methods are horizontal or vertical subsets of the
current MSE.
| Change sequences within the MSE | Top |
These methods affect characters in all sequences without changeing the
alignment.
Methods for setting and reading the MSE attributes.
Note that the methods defining character semantics depend on the user
to set them sensibly. They are needed only by certain input/output
methods. Unset them by setting to an empty string ('').
These read only methods describe the MSE in various ways.
Title : maxdisplayname_length
Usage : $ali->maxdisplayname_length()
Function :
Gets the maximum length of the displayname in the
alignment. Used in writing out various MSE formats.
Returns : integer
Argument :
Methods to map a sequence position into an alignment column and back.
column_from_residue_number() does the former. The latter is really a
property of the sequence object and can done using
Bio::LocatableSeq::location_from_column:
# select somehow a sequence from the alignment, e.g.
my $seq = $aln->get_seq_by_pos(1);
#$loc is undef or Bio::LocationI object
my $loc = $seq->location_from_column(5);
Methods to manipulate the display name. The default name based on the
sequence id and subsequence positions can be overridden in various
ways.