def search_species(self, seqs):
with open(self.species_fp) as f:
ref_seqs = list(parse_fasta(f, trim_desc=True))
xt = HitExtender(seqs, ref_seqs)
with open(self.output_fp) as of:
hits = VsearchAligner._parse(of)
for hit in hits:
yield xt.extend_hit(hit)
def _get_subject_seq(self, subject_id):
subject_outfile = tempfile.NamedTemporaryFile()
subject_outfile_fp = subject_outfile.name
args = [
"blastdbcmd", "-db", self.db, "-entry", subject_id, "-out",
subject_outfile_fp
]
subprocess.check_call(args)
with open(subject_outfile_fp) as f:
return list(parse_fasta(f, trim_desc=True))[0][1]
def load(self, assemblies):
with open(self.accession_fp, "r") as f:
for line in f:
toks = line.strip().split()
seqid = toks[0]
accession = toks[1]
assembly = assemblies[accession]
self.assemblies[seqid] = assembly
self.seqids_by_assembly[assembly.accession].append(seqid)
with open(self.fasta_fp, "r") as f:
for seqid, seq in parse_fasta(f):
self.seqs[seqid] = seq
def test_parse_fasta(self):
res = parse_fasta([
">Seq1 abc def\n",
"GGCTGCTATCAG\n",
"CTAGCATCGTCGCATCGAC\n",
">Seq2\n",
"ACGCTAGCTGCAAAA\n",
])
self.assertEqual(next(res),
("Seq1 abc def", "GGCTGCTATCAGCTAGCATCGTCGCATCGAC"))
self.assertEqual(next(res), ("Seq2", "ACGCTAGCTGCAAAA"))
self.assertRaises(StopIteration, next, res)
def __init__(self,
species_file,
ref_fp,
mismatch_file,
batch_size=10,
num_cpus=None):
self.typestrain_seqs = list(parse_fasta(species_file, trim_desc=True))
self.reference_fasta_fp = ref_fp
self.mismatch_file = mismatch_file
self.min_pct_id = 97.0
self.num_threads = num_cpus
self.batch_size = batch_size
self.max_hits = "10000"
def ssu_seqs(self):
if self._ssu_seqs is not None:
return self._ssu_seqs
if not os.path.exists(self.rna_fp):
try:
self.download_rna()
except urllib.error.HTTPError as e:
print(self.accession)
print(e)
return []
with open(self.rna_fp, "rt") as f:
seqs = list(parse_fasta(f))
res = [(desc, seq) for (desc, seq) in seqs if is_16S(desc)]
self._ssu_seqs = res
return res
def search_species(self, query_seqs):
b = VsearchAligner(self.species_fp)
vsearch_args = {
"min_id": 0.9,
"maxaccepts": 5,
}
if self.num_cpus:
vsearch_args["threads"] = self.num_cpus
hits = b.search(query_seqs, self.species_input_fp,
self.species_output_fp, **vsearch_args)
with open(self.species_fp) as f:
ref_seqs = list(parse_fasta(f, trim_desc=True))
xt = HitExtender(query_seqs, ref_seqs)
for hit in hits:
yield xt.extend_hit(hit)
def process_greengenes_seqs(seqs_fp,
accessions_fp,
output_fp=REFSEQS_FASTA_FP):
duplicates_fp = GG_DUPLICATE_FP
if os.path.isdir(output_fp):
duplicates_fp = os.path.join(output_fp, duplicates_fp)
output_fp = os.path.join(output_fp, REFSEQS_FASTA_FP)
# Extract table of accessions
if accessions_fp.endswith(".gz"):
subprocess.check_call(["gunzip", "-f", accessions_fp])
accessions_fp = gunzip_fp(accessions_fp)
# Load accessions
gg_accessions = {}
with open(accessions_fp) as f:
for ggid, src, acc in parse_greengenes_accessions(f):
gg_accessions[ggid] = (acc, src)
# Extract FASTA file
if seqs_fp.endswith(".gz"):
subprocess.check_call(["gunzip", "-f", seqs_fp])
seqs_fp = gunzip_fp(seqs_fp)
# Remove duplicate reference seqs
uniq_seqs = collections.defaultdict(list)
with open(seqs_fp) as f:
for ggid, seq in parse_fasta(f):
uniq_seqs[seq].append(ggid)
with open(duplicates_fp, "w") as dups:
with open(output_fp, "w") as f:
for seq, ggids in uniq_seqs.items():
ggid = ggids[0]
if len(ggids) > 1:
dups.write(" ".join(ggids))
# Re-label seqs with accession numbers
acc, src = gg_accessions[ggid]
f.write(">%s %s %s\n%s\n" % (acc, src, ggid, seq))
return output_fp
def process_ltp_seqs(input_fp, output_fp=SPECIES_FASTA_FP):
if os.path.isdir(output_fp):
output_fp = os.path.join(output_fp, SPECIES_FASTA_FP)
accession_cts = collections.defaultdict(int)
# Re-format FASTA file
with open(input_fp) as f_in:
seqs = parse_fasta(f_in)
with open(output_fp, "w") as f_out:
for desc, seq in seqs:
vals = desc.split("|")
# Some accessions refer to genomes with more than one 16S gene
# So accessions can be legitiamtely repeated with distinct gene sequences
accession = vals[2]
accession_times_previously_seen = accession_cts[accession]
accession_cts[accession] += 1
if accession_times_previously_seen > 0:
accession = "{0}_repeat{1}".format(
accession, accession_times_previously_seen)
species_name = vals[3]
f_out.write(">{0}\t{1}\n{2}\n".format(accession, species_name,
seq))
return output_fp
def main(argv=None):
p = argparse.ArgumentParser()
p.add_argument("query_fasta",
type=argparse.FileType("r"),
help="Query sequences FASTA file")
p.add_argument(
"--output_dir",
help=("Output directory (default: basename of query sequences FASTA "
"file, plus '_unassigned')"))
p.add_argument(
"--type_strain_fasta",
default="unassigner_species.fasta",
help=("Type strain sequences FASTA file (default: %(default)s). "
"If the default file is not found, sequences are downloaded "
"and re-formatted automatically."))
p.add_argument(
"--threshold",
type=float,
help=("Sequence identity threshold for ruling out species-level "
"compatibility. Default value is 0.975 for the standard "
"algorithm and 0.991 for the soft threshold algorithm."))
p.add_argument(
"--ref_mismatch_positions",
help=("File of mismatch positions in reference database. The file may "
"be compressed in gzip format."))
p.add_argument(
"--num_cpus",
type=int,
help=("Number of CPUs to use during sequence aligment (default: "
"use all the CPUs)"))
p.add_argument("--soft_threshold",
action="store_true",
help="Use soft threshold algorithm.")
p.add_argument("--verbose",
action="store_true",
help="Activate verbose mode.")
args = p.parse_args(argv)
if args.threshold is None:
if args.soft_threshold:
min_id = 0.991
else:
min_id = 0.975
else:
min_id = args.threshold
if args.verbose is True:
logging.basicConfig(format='%(levelname)s: %(message)s',
level=logging.INFO)
query_seqs = list(parse_fasta(args.query_fasta, trim_desc=True))
if args.output_dir is None:
output_dir = os.path.splitext(args.query_fasta.name)[0] + "_unassigned"
else:
output_dir = args.output_dir
# Download type strain files if needed
type_strain_fp_is_default = (
args.type_strain_fasta == p.get_default("type_strain_fasta"))
type_strain_fp_is_missing = not os.path.exists(args.type_strain_fasta)
if type_strain_fp_is_default and type_strain_fp_is_missing:
download_type_strain_data()
with open(args.type_strain_fasta) as f:
species_names = dict(parse_species_names(f))
writer = OutputWriter(output_dir, species_names)
alignment_query_fp = writer.output_fp("unassigner_query.fasta")
alignment_output_fp = writer.output_fp("unassigner_query_hits.txt")
if os.path.exists(alignment_output_fp):
a = FileAligner(args.type_strain_fasta, alignment_output_fp)
else:
a = UnassignAligner(args.type_strain_fasta)
a.species_input_fp = alignment_query_fp
a.species_output_fp = alignment_output_fp
a.num_cpus = args.num_cpus
if args.ref_mismatch_positions:
if args.ref_mismatch_positions.endswith(".gz"):
mm_db_file = gzip.open(args.ref_mismatch_positions, "rt")
else:
mm_db_file = open(args.ref_mismatch_positions)
VariableMismatchRate.load_database(mm_db_file)
app = UnassignerApp(a,
VariableMismatchRate,
min_id=min_id,
soft_threshold=args.soft_threshold)
for query_id, query_results in app.unassign(query_seqs):
writer.write_results(query_id, query_results)
def test_parse_empty_fasta(self):
res = parse_fasta([])
list_res = list(res)
self.assertEqual(list_res, [])
def from_fasta(cls, f):
recs = parse_fasta(f)
return cls(recs)
def main(argv=None):
p = argparse.ArgumentParser()
p.add_argument("query_fasta",
type=argparse.FileType("r"),
help="Query sequences FASTA file")
p.add_argument(
"--output_dir",
help=("Output directory (default: basename of query sequences FASTA "
"file, plus '_unassigned')"))
p.add_argument(
"--type_strain_fasta",
default="unassigner_species.fasta",
help=("Type strain sequences FASTA file (default: %(default)s). "
"If the default file is not found, sequences are downloaded "
"and re-formatted automatically."))
p.add_argument(
"--num_cpus",
type=int,
help=("Number of CPUs to use during sequence aligment (default: "
"use all the CPUs)"))
p.add_argument("--verbose",
action="store_true",
help="Activate verbose mode.")
args = p.parse_args(argv)
if args.verbose is True:
logging.basicConfig(format='%(levelname)s: %(message)s',
level=logging.INFO)
query_seqs = list(parse_fasta(args.query_fasta, trim_desc=True))
if args.output_dir is None:
output_dir = os.path.splitext(args.query_fasta.name)[0] + "_unassigned"
else:
output_dir = args.output_dir
# Download type strain files if needed
type_strain_fp_is_default = (
args.type_strain_fasta == p.get_default("type_strain_fasta"))
type_strain_fp_is_missing = not os.path.exists(args.type_strain_fasta)
if type_strain_fp_is_default and type_strain_fp_is_missing:
download_type_strain_data()
with open(args.type_strain_fasta) as f:
species_names = dict(parse_species_names(f))
writer = OutputWriter(output_dir, species_names)
alignment_query_fp = writer.output_fp("unassigner_query.fasta")
alignment_output_fp = writer.output_fp("unassigner_query_hits.txt")
if os.path.exists(alignment_output_fp):
a = FileAligner(args.type_strain_fasta, alignment_output_fp)
else:
a = UnassignAligner(args.type_strain_fasta)
a.species_input_fp = alignment_query_fp
a.species_output_fp = alignment_output_fp
a.num_cpus = args.num_cpus
algorithm = ThresholdAlgorithm(a)
for query_id, query_results in algorithm.unassign(query_seqs):
writer.write_results(query_id, query_results)
