Question: Does Fasta Produce A Local Or Global Alignment?
1
gravatar for Christian
2.6 years ago by
Christian670
Christian670 wrote:

People get confused about this seemingly simple question. I hear people saying that BLAST performs a local alignment, but FASTA performs a global alignment. Also, historically there seem to be different versions of FASTA with different behaviour. I would like to hear an expert opinion on this.

ADD COMMENTlink written 2.6 years ago by Christian670
4
gravatar for Neilfws
2.6 years ago by
Neilfws41k
Sydney, Australia
Neilfws41k wrote:

You don't have to be an expert; it's right there on the web pages and in the documentation.

FASTA

The FASTA programs find regions of local or global (new) similarity between Protein or DNA sequences

So originally, FASTA did perform local alignment, but more recent versions also perform global. You can also read the changelog to see revisions over time.

BLAST

The Basic Local Alignment Search Tool (BLAST) finds regions of local similarity between sequences

ADD COMMENTlink written 2.6 years ago by Neilfws41k

I think we have to differentiate here between different programs of the FASTA package. It seems the statement above from the University of Virginia regarding the capability of FASTA to perform global alignments refers to the more recent 'ggsearch' program of the FASTA package.

But what about the FASTA program of the FASTA package? Is it correct to say that it performs local alignment only? And has it always been so?

ADD REPLYlink written 2.6 years ago by Christian670

I guess there is FASTA "the suite" and FASTA "the program in the suite". So the former provides (recently) global search, the latter local.

ADD REPLYlink written 2.6 years ago by Neilfws41k
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