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How do I get the frame for a translated search? To see other biotech frequently asked questions,
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(Continued from previous question...) How do I get the frame for a translated search? I'm using Bio::Search* and its frame() to parse BLAST but I'm seeing 0, 1, or 2 instead of the expected -3, -2, -1, +1, +2, +3. Why am I seeing these different numbers and how do I get the frame according to BLAST? These are GFF frames - so +1 is 0 in GFF, -3 will be encoded with a frame of 2 with the strand being set to -1. Frames are relative to the hit or query sequence so you need to query it based on sequence you are interested in: $hsp->hit->strand; $hsp->hit->frame; or $hsp->query->strand; $hsp->query->frame; So the value according to a blast report of -3 can be constructed as: my $blastframe = ($hsp->query->frame + 1) * $hsp->query->strand; (Continued on next question...)
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