Question: how can i download human ribosomal reference ?
0
gravatar for sabaghianamir70
12 months ago by
iran
sabaghianamir7010 wrote:

is there any such data ? and if it is, how can i download it . i need it for extract ribosomal rna from RNA seq data .

rna-seq rrna • 539 views
ADD COMMENTlink modified 12 months ago by genomax83k • written 12 months ago by sabaghianamir7010
1

Download Rrna Sequences

sabaghianamir70, please use the search function for these kind of questions. You seem to get started with NGS analysis now so it is normal and expected that you'll have many questions as we all had when we got started. Still, most (if not all) standard questions that come up during analysis have been asked multiple times before both here and in other communities (e.g. SeqAnswers, SE Bioinformatics, Reddit, Bioconductor). Please use google and the search function thoroughly before opening posts (no offense intended) :)

ADD REPLYlink written 12 months ago by ATpoint34k

Just that you know, it is the job of a moderator to make sure a community stays tidy and organized, that is why we encourage users to search first and then post, not vice versa. Otherwise we will have a dozen threads towards the same topic and information being spread across these, only making it more complicated to find good and definite answers.

ADD REPLYlink written 12 months ago by ATpoint34k

Yep, I have used ensembl biomart for this, as linked in the first comment.

ADD REPLYlink modified 12 months ago • written 12 months ago by Madelaine Gogol5.1k

enter image description here as you can see in image i send, i done what VIPIN said, but this comes up and said the sequences are unavalibale, whould you tell me what part i did wrong.

ADD REPLYlink modified 12 months ago by Devon Ryan95k • written 12 months ago by sabaghianamir7010

Under sequence attribute you have peptide sequence selected (which is the default). Change that to cDNA sequence and you will get the sequences. Looks like there are 74 genes annotated as rRNA.

rRNA

ADD REPLYlink modified 12 months ago • written 12 months ago by genomax83k

but how i should use this as refrence , i want to detect rRNAs from my raw data. i think it ist what i need ??

ADD REPLYlink modified 12 months ago • written 12 months ago by sabaghianamir7010

You can create an index (with aligner of your choice) and then align your reads against that index. I suggest you use the human rDNA repeat I posted a link for below since it is a single contiguous sequence.

ADD REPLYlink written 12 months ago by genomax83k

im using galaxy and i dont know how can put these short rRNAs sequences put together as reference for my analyze. what i looking for is to extract rRNA contamination from my data, but every where i looked, didnt understand what should i exactly do .

ADD REPLYlink written 12 months ago by sabaghianamir7010
  1. Download the sequences from BioMart as a multi-fasta file.
  2. Upload them to galaxy.
  3. Choose that file as "reference genome" when you create an index with aligner you want to use.
  4. Align reads against this reference.
  5. Collect reads that don't map. That set would be your cleaned reads.
ADD REPLYlink modified 12 months ago • written 12 months ago by genomax83k

thank you my friend <3

ADD REPLYlink written 12 months ago by sabaghianamir7010
0
gravatar for genomax
12 months ago by
genomax83k
United States
genomax83k wrote:

Sequence of human rDNA repeat: http://www.ncbi.nlm.nih.gov/nuccore/U13369

There are 400 copies of this unit on 5 chromosomes (http://nar.oxfordjournals.org/content/early/2011/02/25/nar.gkq1326.full )

ADD COMMENTlink modified 12 months ago • written 12 months ago by genomax83k
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