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filter_fasta.py – This script can be applied to remove sequences from a fasta file based on input criteria.

Description:

Usage: filter_fasta.py [options]

Input Arguments:

Note

[REQUIRED]

-f, --input_fasta_fp
Path to the input fasta file
-o, --output_fasta_fp
The output fasta filepath

[OPTIONAL]

-m, --otu_map
An OTU map where sequences ids are those which should be retained
-s, --seq_id_fp
A list of sequence identifiers (or tab-delimited lines with a seq identifier in the first field) which should be retained
-a, --subject_fasta_fp
A fasta file where the seq ids should be retained.
-p, --seq_id_prefix
Keep seqs where seq_id starts with this prefix
-n, --negate
Discard passed seq ids rather than keep passed seq ids [default: False]

Output:

Keep all sequences that show up in an OTU map:

filter_fasta.py -f inseqs.fasta -o filtered_seqs.fasta -m uclust_ref_otus.txt

Discard all sequences that show up in chimera checking output. NOTE: It is very important to pass -n here as this tells the script to negate the request, or discard all sequences that are listed via -s. This is necessary to remove the identified chimeras from inseqs.fasta:

filter_fasta.py -f inseqs.fasta -o non_chimeric_seqs.fasta -s chimeric_seqs.txt -n

Keep all sequences listed in a text file:

filter_fasta.py -f inseqs.fasta -o filtered_seqs.fasta -s seqs_to_keep.txt

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