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  • RNA-seq Galaxy workflow for PE barcoded samples?

    Hello,

    I am working with RNA-seq Illumina data files in Galaxy (http://main.g2.bx.psu.edu/). The files are 100bp paired-end reads, multiplexed with barcoding to distinguish samples. There are two files, one for each end of the paired-end reads (first three reads of the files are pasted below). The barcodes are the first four bases of the sequences in the s_7_1_sequence.txt file.

    Would the following Galaxy workflow be correct?

    1. Upload both s_7_1_sequence.txt and s_7_2_sequence.txt to Galaxy with the reference genome selected
    2. Run NGS: QC and manipulation --> FASTQ Groomer on each file to convert to Sanger FASTQ
    3. Run NGS: QC and manipulation --> FASTQ joiner to combine the data from the two files
    4. Run FASTX-TOOLKIT FOR FASTQ DATA --> Barcode Splitter to generate separate FASTQ files for each barcode group
    5. Run NGS: RNA Analysis --> Tophat to map the reads from each group to the reference genome

    The problem I am having is that if I select paired-end for the library in Tophat, it requests two FASTQ files. Would I have to use FASTQ Splitter to separate the joined FASTQ files? I would be very appreciative of any suggestions.

    Thanks very much in advance,
    jjw

    File 1: s_7_1_sequence.txt

    @HWI-ST538_0096:7:1:1443:1917#0/1
    CGTTNCAGACTCTGCAACGACAGCCTGCCCCCCGGCACCGTGAAGCTCTAGGCACGGCCTGCTCGCCGCCCGGGGACAAGGACTCCTGCCGCTGCCCCCG
    +HWI-ST538_0096:7:1:1443:1917#0/1
    aaa`BcccccggggggfgggfgagggggdaggggggcegedeaadaggdegeeggdebgdZccc]Z`Z^c`S__[^_`aO_Zc^cd`Y`dBBBBBBBBBB
    @HWI-ST538_0096:7:1:1468:1938#0/1
    ACGTNGTCTGTGATGCCCTTAGATGTCCGGGGCTGCACGCGCGCTACACTGACTGGCTCAGCGTGTGCCTACCCTACGCCGGCAGGGGCGGGGAACCCCC
    +HWI-ST538_0096:7:1:1468:1938#0/1
    `_`^Bb_babegggggggggceeeedeggddeggeggegeeedeeeeegddeddccVacVX\ZSXXSX_Xb_XbBBBBBBBBBBBBBBBBBBBBBBBBBB
    @HWI-ST538_0096:7:1:1484:1983#0/1
    AAAGTAGCAAATACACAGCATGAGAAATCGGCATCGGATGTCACAGGGAAAGTAGCAAACACACAGCATGAGAAATCAGCATCGGTTGTCACAGAGAAAG
    +HWI-ST538_0096:7:1:1484:1983#0/1
    gggggfggegfggeggfgggggegggggeggefggggegg\dd^dadc]dda\dcddecZb[b`e_^]_\bbbee`TdY^_Y^BBBBBBBBBBBBBBBBB

    File 2: s_7_2_sequence.txt

    @HWI-ST538_0096:7:1:1443:1917#0/2
    CGTTGGCAGCAGGCAGAGGTGGTGCAGTGGCAGCGGCAGGGGGCCTTGTCCCCGGGCGGCGGGCAGGCGCGGCCCCAGGCGTTACGGGGGCCGGGGGGGG
    +HWI-ST538_0096:7:1:1443:1917#0/2
    ggggggggggggdgegcgaahebfefebbeecfabcaX`cBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
    @HWI-ST538_0096:7:1:1468:1938#0/2
    ACGTTGGGAATTCCTCGTTCATGGGGAATAATTGCAATCCCCGATCCCCATCACGAATGGGGTTCAACGGGTTACCCGCGCCTGCCGGCGTAGGGTAGGA
    +HWI-ST538_0096:7:1:1468:1938#0/2
    gggggggggggggggggggdgggggeedegggadbffedb[dedddcecdgaehefegfdeebcdfadecacafPbb`Lbbd_ZdUX^BBBBBBBBBBBB
    @HWI-ST538_0096:7:1:1484:1983#0/2
    TTTCCCCATGACATCCGATGCTGATTTCTCATGCTGTGCGTTTGCTACTTTCTCTGTGACAACCGATGCTGATTTCTCATGCTGTGTGTTTGCTACTTTC
    +HWI-ST538_0096:7:1:1484:1983#0/2
    gggggggggggggggggggggggbgggedggggggeagefegbgdgaeeggggfgcgfegagggggegg`aad_fee_bgdddd^cX`caQX[M[bce`c

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