I'm using BLAST for a part of my pipeline and need to change my pipeline to allow G/U matching. My google foo isn't getting me very far. Does anyone know if there is a similar version of BLAST with this capability?
Thanks
I'm using BLAST for a part of my pipeline and need to change my pipeline to allow G/U matching. My google foo isn't getting me very far. Does anyone know if there is a similar version of BLAST with this capability?
Thanks
If you want to use BLASTN, it would be best to do so locally so that you can employ your own scoring matrix. If you cannot find a scoring matrix which allows G:U or G:T pairing, you'll have to build it. You'll want to change M and N, where the M parameter sets the reward score for a pair of matching residues and N sets the penalty score for mismatching residues. Typically M=5 and N=-4. If a G:T pair is weaker than G:C, maybe it should have a score of 1, midway between M of 5 and N of -4.
For more on scoring matrices, see this.
I don't know if it fast enough for you, but locARNA allows this kind of matching.
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