[ensembl-dev] Why are ncRNA separate from cDNA?

Daniel Murphy dmurphy at ebi.ac.uk
Mon May 8 09:33:06 BST 2017


Hi Charlie,

The cDNA file contains sequences from all transcripts resulting from 
known, novel and pseudo gene predictions, whereas the ncRNA file 
contains the transcript sequences corresponding to non-coding RNA genes. 
While the sets of transcripts are produced by different pipelines, 
providing the sets as separate files makes sense as some users are more 
interested in only having noncoding sets over coding, for example.

Daniel


On 05/05/2017 18:11, Charles Joseph Murphy wrote:
> To be more specific, why are these two files separate? Why not just 
> have one FASTA file? I’ am asking this question because I’ am working 
> with another individual on a python package for downloading/managing 
> Ensembl data (https://github.com/hammerlab/pyensembl)
>
> ftp://ftp.ensembl.org/pub/release-88/fasta/homo_sapiens/cdna//Homo_sapiens.GRCh38.cdna.all.fa.gz
>
> ftp://ftp.ensembl.org/pub/release-88/fasta/homo_sapiens/ncrna//Homo_sapiens.GRCh38.ncrna.fa.gz
>
>
>
>
>> On May 5, 2017, at 13:06, Charles Joseph Murphy 
>> <chm2059 at med.cornell.edu <mailto:chm2059 at med.cornell.edu>> wrote:
>>
>> Hi,
>>
>> Just out of curiosity, why are the cDNA and ncRNA sequences in 
>> separate FASTA files? Is this due to each set of transcripts being 
>> produced via different computational pipelines?
>>
>> Charlie
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