| Bio::Map::GeneMap(3pm) | User Contributed Perl Documentation | Bio::Map::GeneMap(3pm) |
Bio::Map::GeneMap - A MapI implementation to represent the area around a gene
use Bio::Map::GeneMap;
use Bio::Map::Gene;
use Bio::Map::TranscriptionFactor;
use Bio::Map::GeneRelative;
# make some maps that will represent an area around a particular gene in
# particular species (by default, the map represents the area in the genome
# 1000bp upstream of the gene)
my $map1 = Bio::Map::GeneMap->get(-gene => 'BRCA2',
-species => 'human',
-description => 'breast cancer 2, early onset');
my $map2 = Bio::Map::GeneMap->get(-gene => 'BRCA2',
-species => 'mouse');
# model a TF that binds 500bp upstream of the BRCA2 gene in humans and
# 250bp upstream of BRCA2 in mice
my $rel = Bio::Map::GeneRelative->new(-description => "gene start");
my $tf = Bio::Map::TranscriptionFactor->get(-universal_name => 'tf1');
Bio::Map::Position->new(-map => $map1,
-element => $tf,
-start => -500,
-length => 10,
-relative => $rel);
Bio::Map::Position->new(-map => $map2,
-element => $tf,
-start => -250,
-length => 10,
-relative => $rel);
# find out all the things that map near BRCA2 in all species
foreach my $map ($gene->known_maps) {
foreach my $thing ($map->get_elements) {
next if $thing eq $gene;
foreach my $pos ($thing->get_positions($map)) {
print "In species ", $map->species, ", ",
$thing->universal_name, " maps at ", $pos->value,
" relative to ", $pos->relative->description, " of gene ",
$gene->universal_name, "\n";
}
}
}
# a GeneMap isa PrimarySeq and so can have sequence associated with it
$map1->seq('ATGC');
my $subseq = $map1->subseq(2,3); # TG
Model the abstract notion of the area around a gene - you don't care exactly where this area is in the genome, you just want to be able to say "something binds upstream of gene X" and "something else binds 20bp upstream of the first something" etc.
It's useful for modelling transcription factor bindings sites, letting you find out which transcription factors bind near a gene of interest, or which genes are bound by a transcription factor of interest.
See t/Map/Map.t for more example usage.
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.
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Please direct usage questions or support issues to the mailing list:
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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.
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Email bix@sendu.me.uk
The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : new
Usage : my $obj = Bio::Map::GeneMap->new();
Function: Builds a new Bio::Map::GeneMap object (that has placed on it a
mappable element (Bio::Map::Gene) representing a gene).
Returns : Bio::Map::GeneMap
Args : -gene => string name of the gene this map will be for
(in a form common to all species that have the gene,
but unique amongst non-orthologous genes) or a
Bio::Map::Gene object, REQUIRED
-species => Bio::Taxon or string representing species, REQUIRED
-uid => string, unique identifier for this map (must be
unique amongst all gene/species combinations)
-description => string, free text description of the gene
-upstream => int, the number of bases the map extends before the
start of the gene element (default 1000).
-downstream => int, the number of bases the map extends beyond the
end of the gene element (default 0).
-seq => string, the sequence of the map, presumably the
genomic sequence -upstream bases of the gene,
including the gene, and -downstream bases of the gene
Title : get
Usage : my $map = Bio::Map::GeneMap->get();
Function: Builds a new Bio::Map::GeneMap object (like new()), or gets a
pre-existing one that corresponds to your arguments.
Returns : Bio::Map::GeneMap
Args : -gene => string name of the gene this map will be for
(in a form common to all species that have the gene,
but unique amongst non-orthologous genes) or a
Bio::Map::Gene object, REQUIRED
-species => Bio::Taxon or string representing species, REQUIRED
-uid => string, unique identifier for this map (must be
unique amongst all gene/species combinations)
-description => string, free text description of the gene
-upstream => int, the number of bases the map extends before the
start of the gene element (default 1000).
-downstream => int, the number of bases the map extends beyond the
end of the gene element (default 0).
-seq => string, the sequence of the map, presumably the
genomic sequence -upstream bases of the gene,
including the gene, and -downstream bases of the gene
If you supply a -uid, and a map had previously been created and
given that uid, that same map object will be returned. Otherwise, the
combination of -gene and -species will be used to determine
if the same map had previously been made. If a corresponding map
hadn't previously been made, a new map object will be created and
returned.
Title : unique_id Usage : my $id = $map->unique_id; Function: Get/set the unique ID for this map Returns : string Args : none to get, OR string to set
Title : species
Usage : my $species = $map->species;
Function: Get/set Species for a map. It is not recommended to change this once
set.
Returns : Bio::Taxon object or string
Args : none to get, OR Bio::Taxon or string to set
Title : type Usage : my $type = $map->type Function: Get Map type Returns : string 'gene' Args : none
Title : gene
Usage : my $gene = $map->gene;
$map->gene(-gene => $gene);
Function: Get/set the mappable element on this map that represents the gene
this map is for. Once set, it is not recommended to re-set the gene
to something else. Behaviour in that case is undefined.
Returns : Bio::Map::Gene
Args : none to get, OR to set:
-gene => Bio::Map::Gene or string of the universal name (see
Bio::Map::Gene docs), REQUIRED
-description => string, applied to the Bio::Map::Gene
-upstream => int, the number of bases the map extends before the
start of the gene element (default 1000).
-downstream => int, the number of bases the map extends beyond the
end of the gene element (default 0).
Title : universal_name
Usage : my $name = $map->universal_name
Function: Get/set the name of Bio::Map::Gene object associated with this map.
It is not recommended to change this once set.
Returns : string
Args : none to get, OR string to set
Title : upstream
Usage : my $distance = $map->upstream;
$map->upstream($distance);
Function: Get/set how long the map is before the start of the Bio::Map::Gene
object on this map.
Returns : int
Args : none to get, OR int to set (the number of bases the map extends
before the start of the gene)
Title : downstream
Usage : my $distance = $map->downstream;
$map->downstream($distance);
Function: Get/set the nominal end of the map relative to the end of the
Bio::Map::Gene object on this map.
Returns : int
Args : none to get, OR int to set (the number of bases the map extends
beyond the end of the gene)
Title : length
Usage : my $length = $map->length();
Function: Retrieves the length of the map. This is normally the length of the
upstream region + length of the gene + length of the downstream
region, but may be longer if positions have been placed on the map
beyond the end of the nominal downstream region.
Returns : int
Args : none
Title : seq
Usage : $string = $obj->seq()
Function: Get/set the sequence as a string of letters. When getting, If the
GeneMap object didn't have sequence attached directly to it for the
region requested, the map's gene's database will be asked for the
sequence, and failing that, the map's gene's positions will be asked
for their sequences. Areas for which no sequence could be found will
be filled with Ns, unless no sequence was found anywhere, in which
case undef is returned.
Returns : string
Args : Optionally on set the new value (a string). An optional second
argument presets the alphabet (otherwise it will be guessed).
Title : subseq
Usage : $substring = $obj->subseq(10, 40);
Function: Returns the subseq from start to end, where the first base
is 1 and the number is inclusive, ie 1-2 are the first two
bases of the sequence. If the GeneMap object didn't have sequence
attached directly to it for the region requested, the map's gene's
database will be asked for the sequence, and failing that, the map's
gene's positions will be asked for their sequences. Areas for which
no sequence could be found will be filled with Ns, unless no
sequence was found anywhere, in which case undef is returned. subseq
requests that extend beyond the end of the map will throw.
Returns : string
Args : integer for start position AND integer for end position
OR
Bio::LocationI location for subseq (strand honored)
OR
Bio::RangeI (eg. a Bio::Map::PositionI)
| 2018-10-27 | perl v5.26.2 |