Details
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Type:
Task
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Status: Closed (View Workflow)
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Priority:
Minor
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Resolution: Done
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Affects Version/s: None
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Fix Version/s: None
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Labels:
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Story Points:2
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Epic Link:
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Sprint:Summer 1
Description
Situation: psl files (EST and mRNA) have some kind of off by one error. The listed end position is +1 compared to where the annotations actually end (positive strand alignments).
For example, if a mRNA on the positive strand says that it starts at 100 and ends at 150, in IGB the annotation will be drawn overlapping bases 100 - 149. If on the negative strand the IGB reported start is +1 to where the annotation is actually drawn. This indicates that the tEnd (https://genome.ucsc.edu/FAQ/FAQformat.html#format2) column is effectively +1 compared to what is actually drawn in IGB. Note that the annotations in IGB appear to be drawn in the correct location, i.e. intron exon boundaries line up correctly. The only issue is that the IGB reported start/end is off by one, depending on positive/negative strand.
Task: Investigate why this issue is occurring. If the issue can be fixed update this ticket.
Attachments
Issue Links
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- Closed
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Activity
This issue is present in older psl files (M_musculus_Dec_2011) and on older versions of IGB (tested 9.0.2).
This is consistent with the other file types as well. Also, PSL is a 0-based file type as is IGB. If you see the example mentioned in the PSL file format description here https://genome.ucsc.edu/FAQ/FAQformat.html#format2 you will see that the end is not inclusive even in the example they have shown it is also ended before the end point that is obtained after doing the calculation.
Below are a few screenshots that show the consistency among other tracks too:
Closing the ticket, as there is no issue to fix.
Note: Here is the link to learn more about the 0 vs 1 based co-ordinate system https://www.biostars.org/p/84686/