Hello Dominique,

Yes, this can be done. Here is the process ->

Start by splitting up the data by using the 'NGS: QC and manipulation -> Barcode Splitter" tool. The result files will be available as links. These can be copied and added to the "Get Data -> Upload File" tool in the text box, in batch, and each will loaded as a dataset. Copying them into a simple text file, then pasting into the Upload tool all at once is a quick way to do this, or you can do one by one.

Once you have the individual files as datasets, you probably will want to rename them to better keep track of which barcode/tag they represent. Click on the pencil icon in the upper right corner of each dataset to do this on the Edit Attributes form.

Next, the idea is to convert the fasta dataset to tabular, add in a column with the "_Tag1" information, merge the original identifier column with the new tag column, cut the columns to rearrange - (you want just the new merged identifier and the original fasta sequence - leaving behind the two columns with the original identifier + tag), then covert back from tabular to fasta format. Use the tools in 'Text Manipulation' and 'FASTA manipulation' to do these operations. I would normally suggest creating/using a workflow at this point, but as the tags will all be different, and the "Add column" step is in the middle of the processing, this is probably not worth it.

Hopefully this helps!

Jen
Galaxy team

On 9/18/13 7:36 AM, D. A. Cowart wrote:
Hello,

I need to perform an action (or series of actions) on an 454 dataset using Galaxy, and have not been able to figure out the necessary steps, even after looking through the toolbar expressions and using custom search.
My file is a fasta and has the standard format:

>GNJQDEZ01A940A
CTGAGTCAGGTCAACAATCATAAGATATTGGCACCATGTACCTGTGGTTCTCGTTTCC
ATGTTA
>GNJQDEZ01BJYQZ
CTGAGTCAGGTCAACAATCATAAGACATCGGCTCTCTATATTTAATATTGGT

Each of the 100,000 sequences within this file contains a specific tag, which is the first 8 nucleotides. There are 19 tags total. I would like to identify these tags and add an identifier of the tag to the sequence name. Therefore, if I am looking for the first tag (CTGAGTCA), the output would look like:

>GNJQDEZ01A940A_*Tag1*
*CTGAGTCA*GGTCAACAATCATAAGATATTGGCACCATGTACCTGTGGTTCTCGTTTCC
ATGTTA

Is it possible to achieve this using Galaxy? If possible, could you kindly suggest tools to use.

Thank you in advance,
Dominique Cowart


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