All right. Problem solved.

The data showed up after I changed the seuqence reference in the bam
file ....

samtools view -h SRR030765.bam > SRR030765.sam
sed -i "s/NC_002754.1/chr/" SRR030765.sam
samtools view -S -b SRR030765.sam > SRR030765-chr.bam

... did the trick.

The reference was inserted by tophat, so now I'm looking for a way to
tell tophat to insert a different reference.

Bottom line: It's not a genome browser issue. Thanks for your
suggestions! And thanks to the browser devs for creating and maintaining it!

http://archaea.ucsc.edu/cgi-bin/hgTracks?org=Sulfolobus+solfataricus&position=chr%3A1-35000&hgt.customText=track%20type=bam%20name=xxxxxxxxxxxxxxxxxxxx%20bigDataUrl=http://rna-seqlyze-data.pfeifer.ch/custom-tracks/S.solfataricus/SRR030765-chr.bam

http://x.vu/srr030765

On 2012-05-10 08:17, Patrick Pfeifer wrote:
> Hello
>
> Thanks for your replies.
>
> I tried hosting this on galaxy as well, but that doesn't work either.
>
> https://main.g2.bx.psu.edu/u/dcgdftvcdv/h/bam-view
>
> I chacked the bam file using samscope (very nice find:
> http://samscope.dna.bio.keio.ac.jp/wiki/index.php/Samscope) and the data
> should be there:
> http://rna-seqlyze-data.pfeifer.ch/various/SRR030765-2.bam.Samscope-screenshot.png
>
> Any other suggestions?
>
>
> On 2012-05-10 01:06, Galt Barber wrote:
>> We don't see any problems with the urls.
>> curl -I on the .bam and .bam.bai show a good response.
>>
>> If you think that your bam is correct,
>> try hosting it on some other http server and see
>> if things improve.  Actually, I tried this on
>> your data and it did not help.
>>
>> Check the content of your bam.
>> Even when we zoom out to the entire chromosome I don't see anything.
>>
>> The 200 and 206 calls are normal for bigDataUrl
>> which access blocks of data.  It often jumps to
>> a position and resumes reading from there via
>> byterange header request and the server responds
>> with a 206.
>>
>> -Galt
>>
>> On 05/09/12 15:42, Hiram Clawson wrote:
>>> Good Afternoon Patrick:
>>>
>>> The URL variable hgt.customText may work better if it is a URL
>>> to a small file with your track definition line.  To see examples
>>> of this type of reference, note references from this page:
>>>     http://genome.ucsc.edu/goldenPath/customTracks/custTracks.html
>>>
>>> --Hiram
>>>
>>>
>>> Patrick Pfeifer wrote:
>>>> Hello
>>>>
>>>> I have a custom bam track with corresponding index (.bai) at
>>>>
>>>> http://rna-seqlyze-data.pfeifer.ch/custom-tracks/S.solfataricus/SRR030765-2.bam.bai
>>>>
>>>> You *should* be able to see it using this url:
>>>>
>>>> http://archaea.ucsc.edu/cgi-bin/hgTracks?org=Sulfolobus+solfataricus&position=chr%3A1-35000&hgt.customText=track%20type=bam%20name=xxxxxxxxxxxxxxxxxxxx%20bigDataUrl=http://rna-seqlyze-data.pfeifer.ch/custom-tracks/S.solfataricus/SRR030765-2.bam
>>>>
>>>> However, it does not work for some me for some reason. The track
>>>> desription shows up in the browser and I see some HTTP HEAD & GET
>>>> requests on my server, all with status 200 or 206, but there is no data
>>>> visible in the browser.
>>>>
>>>> Can you give me any hints what I am doing wrong here?
>>>>
>>>> Thank you
>>>>
>>>> Patrick
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