Question: OMA - without all vs all
gravatar for dtejadamartinez
14 months ago by
dtejadamartinez10 wrote:

I have a data set of 700 coding sequences (which I saved in a reference.fa file) and I need to obtain the orthology relationships (orthologous and paralogous) of these genes against 70 species. I have downloaded the genome cds from NCBI for each species. Now, is it possible to get only these comparisons without going through the all vs all phase? Could I start OMA without comparing all the genomes (cds) with each other? How do I launch these analyses ?

Thanks for your help,

orthology oma • 484 views
ADD COMMENTlink modified 14 months ago • written 14 months ago by dtejadamartinez10

Thanks for your help,

I think I would compute all vs all then.

ADD REPLYlink written 14 months ago by dtejadamartinez10
gravatar for Christophe Dessimoz
14 months ago by
University College London
Christophe Dessimoz510 wrote:

At the moment, it’s necessary to compute all-all among your 70 genomes as well to elucidate orthology relationships.

However, I see two fast alternatives:

1) If these 70 reference genomes are available in OMA, you could export them including all-against-all. Then, OMA would “just” need to compute the 700 CDS against the 70 genomes (and the CDS against themselves but that would be very fast.)

2) if you are mainly interested in functional annotation, you could use the new annotation feature of the OMA browser ( There is also a REST API function for that (

ADD COMMENTlink modified 14 months ago • written 14 months ago by Christophe Dessimoz510
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