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Bio::DB::HTS::Query(3pm) User Contributed Perl Documentation Bio::DB::HTS::Query(3pm)


Copyright [2015-2018] EMBL-European Bioinformatics Institute

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

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Rishi Nag <<gt>


Bio::DB::HTS::Query -- Object representing the query portion of a BAM/SAM alignment


Given an alignment retrieved from a Bio::DB::HTS database,

 my $query = $alignment->query;
 my $name   = $query->display_name;
 my $start  = $query->start;
 my $end    = $query->end;
 my $dna    = $query->dna;    # dna string
 my $seq    = $query->seq;    # Bio::PrimarySeq object
 my @scores = $query->qscore; # quality score


This is a simple Bio::SeqFeatureI object that represents the query part of a SAM alignment.


$seqid = $query->seq_id
The name of the read.
$name = $query->name
The read name (same as seq_id in this case).
$name = $query->display_name
The read display_name (same as seq_id in this case).
$tag = $query->primary_tag
The string "match".
$tag = $query->source_tag
The string "sam/bam".
$start = $query->start
The start of the match in read coordinates.
$end = $query->end
The end of the match in read coordinates;
$len = $query->length
The length of the read.
$seq = $query->seq
A Bio::PrimarySeq representing the read sequence in REFERENCE orientation.
$scores = $query->qscore
The read quality scores. In a list context, a list of integers equal in length to the read sequence length. In a scalar context, an array ref. The qscores are in REFERENCE sequence orientation.
$dna = $query->dna
The DNA string in reference sequence orientation.
$strand = $query->strand
If the query was reversed to align it, -1. Otherwise +1.
$seq = $query->subseq($start,$end)
Return a Bio::PrimarySeq object representing the requested subsequence on the read.


Bio::Perl, Bio::DB::HTS, Bio::DB::HTS::Alignment, Bio::DB::HTS::Constants

2022-02-05 perl v5.34.0