Cufflinks Reporting Fpkm Values Of All Zeroes (0)

Question: Cufflinks Reporting Fpkm Values Of All Zeroes (0)

7.4 years ago by

United States

Hello! I have come across a problem where Cufflinks is reporting all FPKM values as zeroes (0). I have a unique RNA-Seq project from a collaborator where they are studying eyesight by using tree shrews. I found that Ensembl (http://useast.ensembl.org/Tupaia_belangeri/Info/Index) has the FASTA file for the tree shrew genome (only a 2x coverage, so not very good in the first place) and had this file indexed in our local instance of Galaxy. I ran TopHat and it looks as if TopHat ran fine because I'm getting anywhere from 71-80% properly paired when I check the stats using "Flagstat." I then take the accepted hits BAM file from TopHat plus the GTF RefGene file from Ensembl for tree shrew and load that into Cufflinks. It seems as if Cufflinks works okay, but when I inspect Cufflinks three output files, all the FPKM values are 0. I have two other RNA-Seq projects (human and mouse) and both of these projects worked fine through TopHat and Cuff(links/Compare/Diff) and with a RefGene GTF file on our local instance of Galaxy (as well as on the Galaxy instance at Penn State), so it makes me think that both TopHat and Cufflinks are working okay. I'm wondering if it has to do something with the tree shrew reference genome. Has anyone encountered anything like this? If so, how did you solve the problem? If not, do you have any suggestions as to what I can do next? Any help/info would be greatly appreciated. Thanks, David

rna-seq cufflinks • 4.0k views

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modified 7.4 years ago by Jennifer Hillman Jackson ♦ 25k • written 7.4 years ago by David K Crossman • 130

7.4 years ago by

Jennifer Hillman Jackson ♦ 25k

United States

Jennifer Hillman Jackson ♦ 25k wrote:

Hello David, There is most likely some mismatch between the input data. Some things to check: First, double check that the identifiers in the reference genome exactly match those in the RefGene gtf file and modify if necessary. Second, make certain that your RefGene file is sorted the same as the sorting in the BAM file (usually by reference genome chromosome/scaffold/etc and start coordinate). If neither of these solve the issue, Cufflinks has an email list for questions: tophat.cufflinks at gmail.com These are the essentials from this prior Q/A thread concerning the same issue: http://lists.bx.psu.edu/pipermail/galaxy-user/2011-March/002267.html Hopefully this helps! Best wishes for your project, Jen Galaxy team -- Jennifer Jackson http://usegalaxy.org/ http://galaxyproject.org/

ADD COMMENT • link written 7.4 years ago by Jennifer Hillman Jackson ♦ 25k

It appear that you are now using Ensembl make suer it is properly formated- Chr is added to first column. It may be worth checking. Vasu Subject: Re: [galaxy-user] Cufflinks reporting FPKM values of all zeroes (0) To: "David K Crossman" <dkcrossm@uab.edu> Cc: "galaxy-user (galaxy-user@lists.bx.psu.edu)" <galaxy- user@lists.bx.psu.edu=""> Date: Tuesday, July 19, 2011, 5:17 PM Hello David, There is most likely some mismatch between the input data. Some things to check: First, double check that the identifiers in the reference genome exactly match those in the RefGene gtf file and modify if necessary. Second, make certain that your RefGene file is sorted the same as the sorting in the BAM file (usually by reference genome chromosome/scaffold/etc and start coordinate). If neither of these solve the issue, Cufflinks has an email list for questions: tophat.cufflinks at gmail.com These are the essentials from this prior Q/A thread concerning the same issue: http://lists.bx.psu.edu/pipermail/galaxy-user/2011-March/002267.html Hopefully this helps! Best wishes for your project, Jen Galaxy team -- Jennifer Jackson http://usegalaxy.org/ http://galaxyproject.org/ ___________________________________________________________ The Galaxy User list should be used for the discussion of Galaxy analysis and other features on the public server at usegalaxy.org. Please keep all replies on the list by using "reply all" in your mail client. For discussion of local Galaxy instances and the Galaxy source code, please use the Galaxy Development list: http://lists.bx.psu.edu/listinfo/galaxy-dev To manage your subscriptions to this and other Galaxy lists, please use the interface at: http://lists.bx.psu.edu/

ADD REPLY • link written 7.4 years ago by vasu punj • 360

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