def prepare_fasta(id, _run_id,load_ids, species, seq_type,
molecule_type, genome_type, outdir):
""" Write fasta file adapted for OrthoFinder """
fasta_dir = utils.safe_mkdir('fastas_%s' % (_run_id))
nloads = 0
nseqs = 0
for load_id in load_ids:
nloads +=1
taxon = species[load_id].name
fasta = os.path.join(fasta_dir, taxon + '.fa')
with open(fasta, 'w') as ffasta:
for record in database.load_seqs(
load_id, taxon, seq_type, molecule_type, genome_type):
newid = taxon + "@" + str(record.id)
nseqs += 1
utils.write_fasta(ffasta, record.seq, newid)
if not nseqs:
utils.die("no sequences were written to the FASTA file")
diagnostics.log('nloads', nloads)
diagnostics.log('nseqs', nseqs)
ingest('fasta_dir', 'fasta')
def lookup_species(load_ids): #Taken directly from homologize.py
"""Lookup the species data for each run"""
species = {}
# Given a run_id, returns a named tuple with the following elements:
#
# name The species names
# ncbi_id The NCBI taxon id
# itis_id The ITIS taxon id
# catalog_id The agalma catalog id
for load_id in load_ids:
row = biolite.database.execute("""
SELECT catalog.species, catalog.ncbi_id, catalog.itis_id, catalog.id
FROM catalog, runs
WHERE runs.run_id=? AND catalog.id=runs.id;""",
(load_id,)).fetchone()
if not row:
utils.die("Couldn't find species data for run ID %s" % load_id)
if row[0] is None:
utils.die("Species name is empty for catalog ID '%s'" % row[3])
species[load_id] = SpeciesData(*row)
diagnostics.log(str(load_id), row)
diagnostics.log("species", species)
ingest('species')
def prepare_blast(blast_dir, fasta, seq_type, genesets):
"""Prepare all-by-all BLAST database and command list"""
db = os.path.join(blast_dir, "db")
if genesets:
if seq_type == "nucleotide":
program = "blastx"
else:
program = "blastp"
for geneset in genesets:
utils.cat_to_file(geneset, db + ".fa")
# Also add genesets to the query file, to find overlapping genes
# between sets.
utils.cat_to_file(geneset, fasta)
wrappers.MakeBlastDB(db + ".fa", db, "prot")
else:
if (seq_type == "masked_protein") or (seq_type == "protein"):
dbtype = "prot"
program = "blastp"
elif seq_type == "nucleotide":
dbtype = "nucl"
program = "blastn"
else:
utils.die("unrecognized sequence type '%s'" % seq_type)
wrappers.MakeBlastDB(fasta, db, dbtype)
command = program + " -db db -evalue 1e-20" + ' -outfmt "6 qseqid sseqid bitscore qlen length"'
commands = workflows.blast.split_query(fasta, command, 100000, blast_dir)
ingest("commands")
def write_fasta(id, _run_id, load_ids, species, seq_type, molecule_type, genome_type, outdir):
"""Write sequences from the Agalma database to a FASTA file"""
blast_dir = utils.safe_mkdir("allvall_blast_%s_%s" % (id, _run_id))
fasta = os.path.join(blast_dir, "all.fa")
# The nodes file contains a header, which describes the attributes, as well
# as a line for every node (transcript) in the analysis.
nodes = os.path.join(outdir, "nodes.txt")
nloads = 0
nseqs = 0
nbases = 0
with open(nodes, "w") as fnodes, open(fasta, "w") as ffasta:
print >> fnodes, "label\tid\tassembly\tassembly_number"
for load_id in load_ids:
nloads += 1
taxon = species[load_id].name
for record in database.load_seqs(load_id, taxon, seq_type, molecule_type, genome_type):
nseqs += 1
nbases += len(record.seq)
# The id of the node (the second column) is a unique identifier
# and because we already have one in the table, use that here.
print >> fnodes, "%s\t%d\t%s\t%d" % (record.header, record.id, load_id, nloads)
utils.write_fasta(ffasta, record.seq, record.id)
if not nseqs:
utils.die("no sequences were written to the FASTA file")
diagnostics.log_path(nodes, "nodes")
diagnostics.log("nloads", nloads)
diagnostics.log("nseqs", nseqs)
diagnostics.log("nbases", nbases)
ingest("blast_dir", "fasta", "nodes")
def parse_edges(_run_id, seq_type, blast_hits, min_overlap, min_bitscore, min_nodes):
"""Parse BLAST hits into edges weighted by bitscore"""
graph = nx.Graph()
edge_file = "allvall_edges_%s.abc" % _run_id
nseqs = 0
nedges = {"all": 0, "non-self": 0, "passed-overlap": 0, "passed-bitscore": 0, "passed-bitscore-unique": 0}
max_bitscore = None
last_query = "" # For identification of a new query in the table
for f in glob(blast_hits):
for line in open(f):
# fields:
# qseqid sseqid bitscore qlen length
id_from, id_to, bitscore, qlen, length = line.rstrip().split()
# Sometimes blast outputs a bad query id if the query is longer
# than 10Kb
if id_from.startswith("Query_"):
utils.info("discarding bad hit with query id '%s'" % id_from)
continue
bitscore = float(bitscore)
length = float(length) / float(qlen)
# Correct for nucleotide vs. amino acid length ### WHY? lenght here is the overlap proportion
# if seq_type == 'nucleotide'
# length *= 3.0
# Filter out self hits, low scoring hits, and short hits
nedges["all"] += 1
if id_from != last_query:
max_bitscore = (
bitscore
) ## The self-hit is not always at the top as the file is sorted by e-values and ties happens.
last_query = id_from ## however the self-hit always have the same bitscore as the first hit.
if id_from != id_to:
nedges["non-self"] += 1
if length > min_overlap:
nedges["passed-overlap"] += 1
srv = float(bitscore) / float(
max_bitscore
) # SRV: BLAST Score Ratio Values. Blom et al. BMC Bioinformatics 2009, 10:154 doi:10.1186/1471-2105-10-154
if srv > min_bitscore:
nedges["passed-bitscore"] += 1
# If an edge already exists between the nodes, update
# its score to be the max
if graph.has_edge(id_from, id_to):
e = graph.edge[id_from][id_to]
e["score"] = max(e["score"], bitscore)
else:
nedges["passed-bitscore-unique"] += 1
graph.add_node(id_from)
graph.add_node(id_to)
graph.add_edge(id_from, id_to, score=bitscore)
diagnostics.prefix.append("nedges")
diagnostics.log_dict(nedges)
diagnostics.prefix.pop()
with open(edge_file, "w") as f:
for subgraph in nx.connected_component_subgraphs(graph):
nnodes = subgraph.number_of_nodes()
if nnodes >= min_nodes:
nseqs += nnodes
for id_from, id_to in subgraph.edges_iter():
print >> f, "%s\t%s\t%f" % (id_from, id_to, subgraph.edge[id_from][id_to]["score"])
if not nseqs:
utils.die("no sequences were written to the FASTA file")
diagnostics.log("nseqs", nseqs)
ingest("edge_file")
