def _run_reciprocal_diamond(self, query_gene_file, target_gene_file,
evalue, per_identity, per_aln_len, max_hits,
sensitive, high_mem, tmp_dir, output_dir):
"""Perform similarity search of query genes against target genes, and reciprocal hits.
Parameters
----------
query_gene_file : str
File with all query proteins.
target_gene_file : str
File with all target proteins.
evalue : float
E-value threshold for reporting hits.
per_identity : float
Percent identity threshold for reporting hits.
per_aln_len : float
Percent query coverage threshold for reporting hits.
max_hits : int
Maximum number of hits to report per query sequences.
tmp_dir : str
Directory to store temporary files.
output_dir : str
Directory to store blast results.
"""
self.logger.info(
'Creating DIAMOND database of query proteins (be patient!).')
diamond = Diamond(self.cpus)
query_diamond_db = os.path.join(output_dir, 'query_genes')
diamond.create_db(query_gene_file, query_diamond_db)
self.logger.info(
'Creating DIAMOND database of target proteins (be patient!).')
target_diamond_db = os.path.join(output_dir, 'target_genes')
diamond.create_db(target_gene_file, target_diamond_db)
# blast query genes against target proteins
self.logger.info(
'Performing similarity sequence between query and target proteins (be patient!).'
)
if tmp_dir:
tmp_query_hits_table = tempfile.NamedTemporaryFile(
prefix='comparem_hits_', dir=tmp_dir, delete=False)
else:
tmp_query_hits_table = tempfile.NamedTemporaryFile(
prefix='comparem_hits_', delete=False)
tmp_query_hits_table.close()
query_hits_daa_file = os.path.join(output_dir, 'query_hits')
if high_mem:
diamond.blastp(query_gene_file,
target_diamond_db,
evalue,
per_identity,
per_aln_len,
max_hits,
sensitive,
tmp_query_hits_table.name,
'standard',
tmp_dir,
chunk_size=1,
block_size=8)
else:
diamond.blastp(query_gene_file, target_diamond_db, evalue,
per_identity, per_aln_len, max_hits, sensitive,
tmp_query_hits_table.name, 'standard', tmp_dir)
# get target genes hit by one or more query proteins
self.logger.info(
'Creating file with target proteins with similarity to query proteins.'
)
target_hit = set()
for line in open(tmp_query_hits_table.name):
line_split = line.split('\t')
target_hit.add(line_split[1])
target_genes_hits = os.path.join(output_dir, 'target_genes_hit.faa')
fout = open(target_genes_hits, 'w')
for seq_id, seq in seq_io.read_seq(target_gene_file):
if seq_id in target_hit:
fout.write('>' + seq_id + '\n')
fout.write(seq + '\n')
fout.close()
self.logger.info(
'Identified %d target proteins to be used in reciprocal search.' %
len(target_hit))
# perform reciprocal blast
self.logger.info(
'Performing reciprocal similarity sequence between target and query proteins (be patient!).'
)
if tmp_dir:
tmp_target_hits_table = tempfile.NamedTemporaryFile(
prefix='comparem_hits_', dir=tmp_dir, delete=False)
else:
tmp_target_hits_table = tempfile.NamedTemporaryFile(
prefix='comparem_hits_', delete=False)
tmp_target_hits_table.close()
if high_mem:
diamond.blastp(target_genes_hits,
query_diamond_db,
evalue,
per_identity,
per_aln_len,
max_hits,
sensitive,
tmp_target_hits_table.name,
'standard',
tmp_dir,
chunk_size=1,
block_size=8)
else:
diamond.blastp(target_genes_hits, query_diamond_db, evalue,
per_identity, per_aln_len, max_hits, sensitive,
tmp_target_hits_table.name, 'standard', tmp_dir)
# combine hit tables and sort
os.system('cat %s >> %s' %
(tmp_target_hits_table.name, tmp_query_hits_table.name))
os.remove(tmp_target_hits_table.name)
hits_table_file = os.path.join(output_dir, 'hits_sorted.tsv')
self._sort_hit_table(tmp_query_hits_table.name, hits_table_file)
def run(self, scaffold_gene_file, stat_file, ref_genome_gene_files, db_file, evalue, per_identity, per_aln_len):
"""Create taxonomic profiles for a set of genomes.
Parameters
----------
scaffold_gene_file : str
Fasta file of genes on scaffolds in amino acid space.
stat_file : str
File with statistics for individual scaffolds.
ref_genome_gene_files : list of str
Fasta files of called genes on reference genomes of interest.
db_file : str
Database of competing reference genes.
evalue : float
E-value threshold of valid hits.
per_identity : float
Percent identity threshold of valid hits [0,100].
per_aln_len : float
Percent query coverage of valid hits [0, 100].
"""
# read statistics file
self.logger.info('Reading scaffold statistics.')
scaffold_stats = ScaffoldStats()
scaffold_stats.read(stat_file)
# perform homology searches
self.logger.info('Creating DIAMOND database for reference genomes.')
ref_gene_file = os.path.join(self.output_dir, 'ref_genes.faa')
concatenate_gene_files(ref_genome_gene_files, ref_gene_file)
diamond = Diamond(self.cpus)
ref_diamond_db = os.path.join(self.output_dir, 'ref_genes')
diamond.create_db(ref_gene_file, ref_diamond_db)
self.logger.info('Identifying homologs within reference genomes of interest (be patient!).')
self.diamond_dir = os.path.join(self.output_dir, 'diamond')
make_sure_path_exists(self.diamond_dir)
hits_ref_genomes = os.path.join(self.diamond_dir, 'ref_hits.tsv')
diamond.blastp(scaffold_gene_file, ref_diamond_db, evalue, per_identity, per_aln_len, 1, False, hits_ref_genomes)
self.logger.info('Identifying homologs within competing reference genomes (be patient!).')
hits_comp_ref_genomes = os.path.join(self.diamond_dir, 'competing_ref_hits.tsv')
diamond.blastp(scaffold_gene_file, db_file, evalue, per_identity, per_aln_len, 1, False, hits_comp_ref_genomes)
# get list of genes with a top hit to the reference genomes of interest
hits_to_ref = self._top_hits_to_reference(hits_ref_genomes, hits_comp_ref_genomes)
# get number of genes on each scaffold
num_genes_on_scaffold = defaultdict(int)
for seq_id, _seq in seq_io.read_seq(scaffold_gene_file):
scaffold_id = seq_id[0:seq_id.rfind('_')]
num_genes_on_scaffold[scaffold_id] += 1
# get hits to each scaffold
hits_to_scaffold = defaultdict(list)
for query_id, hit in hits_to_ref.items():
gene_id = query_id[0:query_id.rfind('~')]
scaffold_id = gene_id[0:gene_id.rfind('_')]
hits_to_scaffold[scaffold_id].append(hit)
# report summary stats for each scaffold
reference_out = os.path.join(self.output_dir, 'references.tsv')
fout = open(reference_out, 'w')
fout.write('Scaffold ID\tSubject genome IDs\tSubject scaffold IDs')
fout.write('\tGenome ID\tLength (bp)\tGC\tMean coverage')
fout.write('\t# genes\t# hits\t% genes\tAvg. align. length (bp)\tAvg. % identity\tAvg. e-value\tAvg. bitscore\n')
for scaffold_id, hits in hits_to_scaffold.items():
aln_len = []
perc_iden = []
evalue = []
bitscore = []
subject_scaffold_ids = defaultdict(int)
subject_bin_ids = defaultdict(int)
for hit in hits:
aln_len.append(hit.aln_length)
perc_iden.append(hit.perc_identity)
evalue.append(hit.evalue)
bitscore.append(hit.bitscore)
subject_bin_id, subject_gene_id = hit.subject_id.split('~')
subject_scaffold_id = subject_gene_id[0:subject_gene_id.rfind('_')]
subject_scaffold_ids[subject_scaffold_id] += 1
subject_bin_ids[subject_bin_id] += 1
sorted_subject_bin_ids = sorted(subject_bin_ids.items(),
key=operator.itemgetter(1),
reverse=True)
subject_bin_id_str = []
for bin_id, num_hits in sorted_subject_bin_ids:
subject_bin_id_str.append(bin_id + ':' + str(num_hits))
subject_bin_id_str = ','.join(subject_bin_id_str)
sorted_subject_scaffold_ids = sorted(subject_scaffold_ids.items(),
key=operator.itemgetter(1),
reverse=True)
subject_scaffold_id_str = []
for subject_id, num_hits in sorted_subject_scaffold_ids:
subject_scaffold_id_str.append(subject_id + ':' + str(num_hits))
subject_scaffold_id_str = ','.join(subject_scaffold_id_str)
fout.write('%s\t%s\t%s\t%s\t%.2f\t%d\t%d\t%.2f\t%d\t%.2f\t%.2g\t%.2f\n' % (
scaffold_id,
subject_bin_id_str,
subject_scaffold_id_str,
scaffold_stats.print_stats(scaffold_id),
mean(scaffold_stats.coverage(scaffold_id)),
num_genes_on_scaffold[scaffold_id],
len(hits),
len(hits) * 100.0 / num_genes_on_scaffold[scaffold_id],
mean(aln_len),
mean(perc_iden),
mean(evalue),
mean(bitscore)))
fout.close()
return reference_out
def _run_self_diamond(self, query_gene_file, evalue, per_identity,
per_aln_len, max_hits, sensitive, high_mem, tmp_dir,
output_dir):
"""Perform similarity search of query genes against themselves.
Parameters
----------
query_gene_file : str
File with all query sequences.
evalue : float
E-value threshold for reporting hits.
per_identity : float
Percent identity threshold for reporting hits.
per_aln_len : float
Percent query coverage threshold for reporting hits.
max_hits : int
Maximum number of hits to report per query sequences.
tmp_dir : str
Directory to store temporary files.
output_dir : str
Directory to store blast results.
"""
self.logger.info('Creating DIAMOND database (be patient!).')
diamond_db = os.path.join(output_dir, 'query_genes')
diamond = Diamond(self.cpus)
diamond.create_db(query_gene_file, diamond_db)
# create flat hits table
if tmp_dir:
tmp_hits_table = tempfile.NamedTemporaryFile(
prefix='comparem_hits_', dir=tmp_dir, delete=False)
else:
tmp_hits_table = tempfile.NamedTemporaryFile(
prefix='comparem_hits_', delete=False)
tmp_hits_table.close()
# blast all genes against the database
self.logger.info(
'Performing self similarity sequence between genomes (be patient!).'
)
if high_mem:
diamond.blastp(query_gene_file,
diamond_db,
evalue,
per_identity,
per_aln_len,
max_hits,
sensitive,
tmp_hits_table.name,
'standard',
tmp_dir,
chunk_size=1,
block_size=8)
else:
diamond.blastp(query_gene_file, diamond_db, evalue, per_identity,
per_aln_len, max_hits, sensitive,
tmp_hits_table.name, 'standard', tmp_dir)
# sort hit table
hits_table_file = os.path.join(output_dir, 'hits_sorted.tsv')
self._sort_hit_table(tmp_hits_table.name, hits_table_file)