Sendu Bala
and 1 contributors


Bio::Tools::Gel - Calculates relative electrophoretic migration distances


    use Bio::PrimarySeq;
    use Bio::Tools::RestrictionAnalysis;
    use Bio::Tools::Gel;

    # get a sequence
    my $seq1 = Bio::Seq->new(-id=>'groundhog day',-seq=>$d);

    # cut it with an enzyme
    my $ra=Bio::Restriction::Analysis->new(-seq=>$seq1);
    @cuts = $ra->fragments('EcoRI'), 3;

    # analyse the fragments in a gel
    my $gel = Bio::Tools::Gel->new(-seq=>\@cuts,-dilate=>10);
    my %bands = $gel->bands;
    foreach my $band (sort {$b <=> $a} keys %bands){
      print $band,"\t", sprintf("%.1f", $bands{$band}),"\n";

    #20   27.0
    #25   26.0
    #10   30.0


This takes a set of sequences or Bio::Seq objects, and calculates their respective migration distances using: distance = dilation * (4 - log10(length(dna));

Source: Molecular Cloning, a Laboratory Manual. Sambrook, Fritsch, Maniatis. CSHL Press, 1989.

Bio::Tools::Gel currently calculates migration distances based solely on the length of the nucleotide sequence. Secondary or tertiary structure, curvature, and other biophysical attributes of a sequence are currently not considered. Polypeptide migration is currently not supported.


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AUTHOR - Allen Day



The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _


 Title   : new
 Usage   : my $gel = new Bio::Tools::Gel(-seq => $sequence,-dilate => 3);
 Function: Initializes a new Gel
 Returns : Bio::Tools::Gel
 Args    : -seq      => Bio::Seq(s), scalar(s) or list of either/both 
                        (default: none)
           -dilate   => Expand band migration distances (default: 1)


 Title   : add_band
 Usage   : $gel->add_band($seq);
 Function: Calls _add_band with a (possibly created) Bio::Seq object.
 Returns : 
 Args    : Bio::Seq, scalar sequence, or list of either/both.


 Title   : _add_band
 Usage   : $gel->_add_band($seq);
 Function: Adds a new band to the gel.
 Returns : 
 Args    : Bio::Seq object


 Title   : dilate
 Usage   : $gel->dilate(1);
 Function: Sets/retrieves the dilation factor.
 Returns : dilation factor 
 Args    : Float or none


 Title   : bands
 Usage   : $gel->bands;
 Function: Calculates migration distances of sequences.
 Returns : hash of (seq_id => distance)
 Args    : 


 Title   : log10
 Usage   : log10($n);
 Function: returns base 10 log of $n.
 Returns : float
 Args    : float