GenBank files. Pairing mRNA with CDS.

[thedamian]

Hi,

I have a GenBank file, that contains several mRNA and CDS.
I'd like to pull from that file pairs of mRNA and CDS.

For example:
Having a .gb file for NF1 gene

http://www.ncbi.nlm.nih.gov/nuccore/NG_009018.1?from=4951&to=287701&report=genbank

I know, that mRNA with ID NM_000267.3 has corresponding CDS with ID NP_000258.1

I know it because a tag of mRNA: /product="neurofibromin 1, transcript variant 2"
describes "/product" tag of CDS: /product="neurofibromin isoform 2"

I use Perl's Bio::SeqIO for parsing .gb files. I can pull all main tags like mRNA and CDS, but I don't see any way how to combine them in pairs.

Thanks for suggestions.

[maubp]

The pairing is implicit in GenBank format by virtue of the order of the features. The may be a BioPerl option to deduce this since BioPerl can IIRC do GenBank to GFF3 conversion.

P.S. If you used GFF3 the parent/child relationship would be explicit - the NCBI have fixed their GFF3 since I wrote this: http://blastedbio.blogspot.co.uk/201...ll-broken.html

[thedamian]

heh, I don't see this order
for example here:

http://www.ncbi.nlm.nih.gov/nuccore/NG_017013.1

mRNA with /transcript_id="NM_001126118.1" is the 5th mRNA from the top.
Corresponding CDS is 9th from the top.

Where is an order here?

[maubp]

heh, I don't see this order

Oh, you've got multiple transcripts. That does complicate life

[Richard Finney]

I am not sure if this might help ...

The gene2accession file from NCBI [ fetchable using wget like this ...
wget -nc ftp://ftp.ncbi.nlm.nih.gov/gene/DATA/gene2accession.gz
and then ungzip ] contains the mrna and the protein acessions.

Eg.
grep NP_000258 gene2accession | grep GRCh37
9606 4763 REVIEWED NM_000267.3 270132515 NP_000258.1 4557793 NC_000017.10 224589808 29421944 29704694 + Reference GRCh37.p9 Primary Assembly
9606 4763 REVIEWED NM_000267.3 270132515 NP_000258.1 4557793 NT_010799.15 224514948 4158938 4441688 + Reference GRCh37.p9 Primary Assembly

[thedamian]

Thank you Richard!
Seems it is what I need!