def read_exons(gtf):
transcripts = defaultdict(pyinter.IntervalSet)
totlen = 0
names = []
trs, ids = [], []
for toks in (x.rstrip('\r\n').split("\t") for x in ts.nopen(gtf) if x[0] != "#"):
if toks[2] not in("CDS", "stop_codon") or toks[1] not in("protein_coding"): continue
#if toks[0] != "1": break
start, end = map(int, toks[3:5])
assert start <= end, toks
transcript = toks[8].split('transcript_id "')[1].split('"', 1)[0]
transcripts[transcript].add(pyinter.closedopen(start-1, end))
names.append(toks[8].split('transcript_name "')[1].split('"', 1)[0].rsplit("-", 1)[0])
ids.append(toks[8].split('gene_id "')[1].split('"', 1)[0])
trs.append(toks[8].split('transcript_id "')[1].split('"', 1)[0])
# sort by start so we can do binary search.
# TODO: need to remove overlapping exons so we don't double-count
transcripts = dict((k, sorted(v)) for k, v in transcripts.iteritems())
#ends = dict((k, sorted(v)) for k, v in ends.iteritems())
ints={}
lens=pyinter.IntervalSet()
for tr, ivset in transcripts.iteritems():
sends = sorted(list(ivset))
iset=pyinter.IntervalSet(pyinter.closedopen(x.lower_value,x.upper_value) for x in sends)
lens = lens.union(iset)
ss, es = [x.lower_value for x in sends], [x.upper_value for x in sends]
ints[tr] = (ss,es)
totlen = sum(x.upper_value-x.lower_value for x in lens)
return ints, set(names), set(ids), set(trs), totlen
def get_gap_overlap_positions(path, blocks, read_len, min_mappable=20):
blocks_gaps = genome_blocks_gaps(blocks, path)
m = min_mappable
gap_ref = pyinter.IntervalSet()
ref = pyinter.IntervalSet()
pos = 0
for b in blocks_gaps:
if len(b) == 0:
continue
if not b.is_insertion():
gap_ref.add(pyinter.closedopen(pos, pos + len(b)))
if not b.is_gap:
ref.add(pyinter.closedopen(pos, pos + len(b)))
pos += len(b)
# print('gap_ref: {0}\nref: {1}\n'.format(gap_ref, ref))
A1 = pyinter.IntervalSet() # i: [i, i+m) contained in gap_ref
A2 = pyinter.IntervalSet() # i: [i, i+m) overlaps ref
for iv in gap_ref:
if iv.lower_value <= iv.upper_value - m:
A1.add(pyinter.closed(iv.lower_value, iv.upper_value - m))
for iv in ref:
# print(iv)
A2.add(pyinter.closed(iv.lower_value - m + 1, iv.upper_value - 1))
# print(A2)
A3 = A1.intersection(A2)
A4 = pyinter.IntervalSet()
A5 = pyinter.IntervalSet()
for iv in A1:
A4.add(pyinter.closed(iv.lower_value - read_len + m, iv.upper_value))
for iv in A3:
A5.add(pyinter.closed(iv.lower_value - read_len + m, iv.upper_value))
result = A4.difference(A5)
# print('A1: {0}\nA2: {1}\nA3: {2}\nA4: {3}\nA5: {4}\n'.format(A1, A2, A3, A4, A5))
# print('result: {0}'.format(result))
# print('')
# remove any empty intervals
out = pyinter.IntervalSet()
for iv in result:
a = iv.lower_value - 1 if iv.lower_value in iv else iv.lower_value
b = iv.upper_value + 1 if iv.upper_value in iv else iv.upper_value
# if iv.lower_value in iv or iv.upper_value in iv: # not open
# print('A1: {0}\nA2: {1}\nA3: {2}\nA4: {3}\nA5: {4}\n'.format(A1, A2, A3, A4, A5))
# print('result: {0}'.format(result))
# print(iv)
# raise Warning('non-open interval in get_gap_positions')
if a < b - 1:
out.add(pyinter.open(a, b))
return out
def generate_gbk_feature_index(genbank_path, feature_index_output_path):
"""
Create a pickled pyinterval index of genbank features so we can pull
them quickly.
"""
gbk_feature_list = []
with open(genbank_path, 'r') as fh:
for seq_record in SeqIO.parse(fh, 'genbank'):
interval_list = []
for f in seq_record.features:
if f.type not in GBK_FEATURES_TO_EXTRACT:
continue
f_ivl = pyinter.closedopen(
f.location.start, f.location.end)
f_ivl.type = f.type
if 'gene' in f.qualifiers:
f_ivl.name = f.qualifiers['gene'][0]
elif 'mobile_element_type' in f.qualifiers:
f_ivl.name = f.qualifiers['mobile_element_type'][0]
# For now, if the gene has no '.name' or '.mobile_element_type', ignore
gbk_feature_list.append(f_ivl)
with open(feature_index_output_path, 'w') as fh:
pickle.dump(gbk_feature_list, fh)
def get_features_at_locations(ref_genome, intervals, chromosome=None):
"""
Use the genbank index dataset and return gene or mobile element names
that are within these intervals.
"""
feature_index_path = get_dataset_with_type(ref_genome,
Dataset.TYPE.FEATURE_INDEX).get_absolute_location()
with open(feature_index_path, 'r') as fh:
gbk_feature_list = pickle.load(fh)
# Dictionary of features to return, for each interval.
return_features = {}
# For each input interval, return a list of feature names that
# overlap.
for interval in intervals:
q_ivl = pyinter.closedopen(*interval)
features = [f_ivl for f_ivl in gbk_feature_list if
q_ivl.intersect(f_ivl)]
return_features[interval] = features
return return_features
def get_features_at_locations(ref_genome, intervals, chromosome=None):
"""
Use the genbank index dataset and return gene or mobile element names
that are within these intervals.
"""
feature_index_path = get_dataset_with_type(
ref_genome, Dataset.TYPE.FEATURE_INDEX).get_absolute_location()
with open(feature_index_path, 'r') as fh:
gbk_feature_list = pickle.load(fh)
# Dictionary of features to return, for each interval.
return_features = {}
# For each input interval, return a list of feature names that
# overlap.
for interval in intervals:
q_ivl = pyinter.closedopen(*interval)
features = [
f_ivl for f_ivl in gbk_feature_list if q_ivl.intersect(f_ivl)
]
return_features[interval] = features
return return_features
def generate_gbk_feature_index(genbank_path, feature_index_output_path):
"""
Create a pickled pyinterval index of genbank features so we can pull
them quickly.
"""
gbk_feature_list = []
with open(genbank_path, 'r') as fh:
for seq_record in SeqIO.parse(fh, 'genbank'):
interval_list = []
for f in seq_record.features:
if f.type not in GBK_FEATURES_TO_EXTRACT:
continue
f_ivl = pyinter.closedopen(f.location.start, f.location.end)
f_ivl.type = f.type
if 'gene' in f.qualifiers:
f_ivl.name = f.qualifiers['gene'][0]
elif 'mobile_element_type' in f.qualifiers:
f_ivl.name = f.qualifiers['mobile_element_type'][0]
# For now, if the gene has no '.name' or '.mobile_element_type', ignore
gbk_feature_list.append(f_ivl)
with open(feature_index_output_path, 'w') as fh:
pickle.dump(gbk_feature_list, fh)
def load_genome_gaps(gapsfile, chrom_name):
gaps = pyinter.IntervalSet()
with open(gapsfile, 'r') as file:
lines = [l for l in file.readlines() if l.split('\t')[0] == chrom_name]
for line in lines:
toks = line.split('\t')
a, b = int(toks[1]), int(toks[2])
gaps.add(pyinter.closedopen(a, b))
return gaps
def read_repeats(path,keyname):
tracks = defaultdict(pyinter.IntervalSet)
for toks in (x.rstrip('\r\n').split() for x in ts.nopen(path) if x[0] != "#"):
start, end = map(int, toks[1:3])
assert start <= end, toks
tracks[keyname].add(pyinter.closedopen(start, end))
ints={}
for pid, ivset in tracks.iteritems():
sends = sorted(list(ivset))
ss, es = [x.lower_value for x in sends], [x.upper_value for x in sends]
ints[pid] = (ss,es)
return ints
def compute_null_dist(opts, discordant_pairs, dtype, insert_mu, insert_sigma,
gap_file, lib_idx, lr_cond):
nreps = opts['pecluster_null_reps']
chrom_name, start, end = opts['chromosome'], opts['region_start'], opts[
'region_end']
gaps_inter = load_genome_gaps(gap_file, chrom_name)
chrom_inter = pyinter.IntervalSet()
chrom_inter.add(pyinter.closedopen(start, end))
non_gaps_inter = chrom_inter.difference(gaps_inter)
non_gaps = [(i.lower_value, i.upper_value) for i in non_gaps_inter]
total_len = sum([i[1] - i[0] for i in non_gaps])
# For deletion null clusters, don't use pairs that are obviously too large.
# (for normal data the discordant read cutoff for deletion supports
# is like mu + 3 sigma ~ mu + .3mu, and we're excluding stuff bigger than 3mu)
if dtype == 'Del':
max_null_insert = insert_mu * opts['insert_max_mu_multiple']
else:
max_null_insert = np.Inf
null_clusters = []
lr_null_clusters = np.array([], float)
for _ in range(nreps):
shuffled = shuffle_discordant_pairs(discordant_pairs,
total_len,
max_insert_size=max_null_insert)
clusters_tmp, _ = cluster_pairs(opts, shuffled, dtype, lib_idx,
insert_mu, insert_sigma)
null_clusters.extend(clusters_tmp)
lr_tmp = np.fromiter((lr_fun[dtype](c, insert_mu, insert_sigma,
opts['insert_cutoff'], lr_cond)
for c in clusters_tmp), float)
lr_null_clusters = np.append(lr_null_clusters, lr_tmp)
if opts['verbosity'] > 1:
print('[compute_null_dist] {0}'.format(dtype))
print('shuffled lr:')
print(lr_null_clusters)
print('')
outname = ('{0}_{1}_null_cluster_{2}reps.txt'.format(
opts['library_names'][lib_idx], dtype, nreps))
fname = os.path.join(opts['outdir'], 'logging', outname)
write_clustering_results(fname,
list(zip(lr_null_clusters, null_clusters)),
first_reject=0)
# print('there were {0} {1} clusters after shuffling'.format(len(clusters),
# dtype))
lr_null_clusters.sort()
return lr_null_clusters
def read_pfam(path):
tracks = defaultdict(pyinter.IntervalSet)
pids, trs, ids = [], [], []
for toks in (x.rstrip('\r\n').split() for x in ts.nopen(path) if x[0] != "#"):
start, end = map(int, toks[1:3])
assert start <= end, toks
pid = toks[10].split(';',1)[0].strip('"') #pfamA_id
tracks[pid].add(pyinter.closedopen(start, end))
ids.append(toks[12].split(';',1)[0].strip('"')) #gene_name
trs.append(toks[14].split(';',1)[0].strip('"')) #transcript_id
ints={}
for pid, ivset in tracks.iteritems():
sends = sorted(list(ivset))
ss, es = [x.lower_value for x in sends], [x.upper_value for x in sends]
ints[pid] = (ss,es)
return ints
def svelter_convert(svelterfile, outdir, reffile, filter_gaps=False, refgapfile=None,
flank_size=1000, verbosity=0):
os.system('mkdir -p %s' % outdir)
# collect all bps
# all_bp = []
# with open(svelterfile, 'r') as svelter:
# for line in svelter:
# if is_svelter_header(line):
# continue
# bp_str = line.split('\t')[3].split(':')[1:]
# all_bp.extend(int(x) for x in bp_str)
# all_bp.sort()
log = open(os.path.join(outdir, 'convert_{0}.log'.format(svelterfile)), 'w')
data = []
# it seems some sv can be repeated in svelter output with different scores
seen_svstring = set()
seen_id = {}
skipped_seen = 0
skipped_refgap = 0
with open(svelterfile, 'r') as svelter:
toks_list = [line.rstrip().split('\t') for line in svelter]
if filter_gaps:
chroms = set(toks[0] for toks in toks_list)
chrom_gaps = {chrom: load_genome_gaps(refgapfile, chrom) for chrom in chroms}
else:
chrom_gaps = None
for toks in toks_list:
# check if header
if toks[0] == 'chr' and toks[1] == 'start':
continue
# check if passing score
if float(toks[6]) == 0:
continue
# check if sv is duplicate
svstring = ' '.join(toks[:6])
if svstring in seen_svstring:
skipped_seen += 1
continue
else:
seen_svstring.add(svstring)
# adjust id if we've seen it before
id = toks[3]
num_id_seen = seen_id.get(id, 0)
seen_id[id] = num_id_seen + 1
if num_id_seen > 0:
print('saw {0} again'.format(id))
id_extra = ';' + str(num_id_seen + 1)
else:
id_extra = ''
chrom = toks[0]
bp_str = toks[3].split(':')[1:]
bp = [int(x) for x in bp_str]
if filter_gaps:
sv_interval = pyinter.closedopen(bp[0], bp[-1])
sv_gap_intersection = chrom_gaps[chrom].intersection([sv_interval])
if len(sv_gap_intersection) > 0:
skipped_refgap += 1
continue
breakpoints = {(x, x): Breakpoint((x, x)) for x in bp}
# il = bisect_left(all_bp, bp[0])
# if il > 0:
# slop_left = min(all_bp[il] - all_bp[il-1], flank_size)
# else:
# slop_left = flank_size
# ir = bisect_right(all_bp, bp[-1])
# if ir < len(all_bp):
# slop_right = min(all_bp[ir] - all_bp[ir-1], flank_size)
# else:
# slop_right = flank_size
slop_left, slop_right = flank_size, flank_size
start = bp[0] - slop_left
end = bp[-1] + slop_right
cbout = create_blocks(breakpoints, pyinter.IntervalSet(), chrom, start, end, verbosity)
blocks, _, left_bp, right_bp = cbout
svelter_strings = toks[5].split('/')
paths = [svelter_string_to_path(x, len(blocks)) for x in svelter_strings]
score = float(toks[6])
this_data = (paths, blocks, left_bp, right_bp, score, 'PASS',
id_extra, None, None) # no extra INFO/FORMAT tags like VCF vase
data.append(this_data)
log.write('skipped_seen\t{0}\n'.format(skipped_seen))
log.write('skipped_refgap\t{0}\n'.format(skipped_refgap))
do_sv_processing(data, outdir, reffile, log, verbosity)
svelter.close()
log.close()
def generic_vcf_convert(vcffile, outdir, reffile, filter_gaps=False, refgapfile=None,
caller=None, flank_size=1000, verbosity=0):
os.system('mkdir -p %s' % outdir)
vcf = open(vcffile, 'r')
log = open(os.path.join(outdir, 'convert_{0}.log'.format(vcffile)), 'w')
data = []
svtype_skipped = {}
seen_coords_count = {}
skipped_refgap = 0
write_extra = False # need to write FORMAT or INFO to file?
with open(vcffile, 'r') as vcf:
toks_list = [line.rstrip().split('\t') for line in vcf if line[0] != '#']
if filter_gaps:
chroms = set(toks[0] for toks in toks_list)
chrom_gaps = {chrom: load_genome_gaps(refgapfile, chrom) for chrom in chroms}
else:
chrom_gaps = None
for toks in toks_list:
# NOTE not parsing qual; do filtering beforehand for DELLY
chrom, pos, id, ref, alt, qual, filterstring, info, format, sample1 = toks
# VCF is 1-indexed, but specifies pos/end positions
# which are to the left of breakpoints, so no adjustment
pos = int(pos)
tags = info.split(';')
if 'PRECISE' in tags:
filterstring += ':PRECISE'
elif 'IMPRECISE' in tags:
filterstring += ':IMPRECISE'
elif caller == 'lumpy': # only includes tags for imprecise events
filterstring += ':PRECISE'
tags = [t for t in tags if '=' in t]
tagd = {t.split('=')[0]: t.split('=')[1] for t in tags}
end = int(tagd.get('END', -99999))
svtype = tagd['SVTYPE']
if caller == 'pindel' and svtype == 'INS':
inslen = int(tagd['SVLEN'])
else:
inslen = int(tagd.get('INSLEN', 0))
if caller == 'pindel':
homlen = int(tagd['HOMLEN'])
if pos + homlen > end or svtype == 'INS':
print('pos + homlen > end: positions {0}'.format((pos, end)))
cipos = (0, 0)
ciend = (0, 0)
else:
cipos = (0, homlen)
ciend = (0, homlen)
else:
if 'CIPOS95' in tagd: # LUMPY
tmp = tagd['CIPOS95'].split(',')
cipos = (int(tmp[0]), int(tmp[1]))
elif 'CIPOS' in tagd:
tmp = tagd['CIPOS'].split(',')
cipos = (int(tmp[0]), int(tmp[1]))
else:
cipos = (0, 0)
if 'CIEND95' in tagd: # LUMPY
tmp = tagd['CIEND95'].split(',')
ciend = (int(tmp[0]), int(tmp[1]))
elif 'CIEND' in tagd:
tmp = tagd['CIEND'].split(',')
ciend = (int(tmp[0]), int(tmp[1]))
else:
ciend = (0, 0)
split_support = int(tagd.get('SR', 0))
pe_support = int(tagd.get('PE', 0))
# lumpy STRANDS only relevant for inversions
if caller == 'lumpy' and svtype == 'INV':
tmp = tagd['STRANDS'].split(',')
tmpd = {a: b for (a, b) in (p.split(':') for p in tmp)}
tagd['INV_PLUS'] = tmpd['++']
tagd['INV_MINUS'] = tmpd['--']
tagd_used = ('SR', 'PE', 'SVTYPE', 'SVMETHOD', 'END', 'STRANDS',
'SVLEN', 'HOMSEQ', 'CONSENSUS', 'CHR2')
tagd_extra = {k: v for (k, v) in tagd.items() if k not in tagd_used}
tags2 = {k: v for (k, v) in zip(format.split(':'), sample1.split(':'))}
if 'AD' in tags2: # pindel
split_support = int(tags2['AD'].split(',')[1])
gt = tags2['GT']
if gt == './.' or gt == '.|.':
is_het = False
filterstring += ':NOGT'
elif gt in ('0/0', '0|0'):
is_het = False
filterstring += ':ZEROGT'
elif gt in ('0/1', '1/0', '0|1', '1|0'):
is_het = True
else:
assert(gt in ('1/1', '1|1'))
is_het = False
tags2_used = ('AD', 'SR', 'PE', 'SU')
tags2_extra = {k: v for (k, v) in tags2.items() if k not in tags2_used}
if len(tagd_extra) + len(tags2_extra) > 0:
write_extra = True
# cases
if svtype == 'DEL':
path = (0, 1, 4, 5)
refpath = (0, 1, 2, 3, 4, 5)
supptype = 'Del'
elif svtype == 'INV':
path = (0, 1, 3, 2, 4, 5)
refpath = (0, 1, 2, 3, 4, 5)
supptype = 'InvL'
elif svtype == 'DUP' or svtype == 'DUP:TANDEM':
path = (0, 1, 2, 3, 2, 3, 4, 5)
refpath = (0, 1, 2, 3, 4, 5)
supptype = 'Dup'
elif svtype == 'INS':
# INSERTIONS parse inslen, add insertion block to blocks
path = (0, 1, 4, 5, 2, 3)
refpath = (0, 1, 2, 3)
supptype = 'Ins'
else:
# skipping delly TRA
# skipping BND events as they may be ambiguous, in terms of the path
svtype_skipped[svtype] = svtype_skipped.get(svtype, 0) + 1
continue
# check ref gap overlap
if filter_gaps and end > pos:
sv_interval = pyinter.closedopen(pos, end)
sv_gap_intersection = chrom_gaps[chrom].intersection([sv_interval])
if len(sv_gap_intersection) > 0:
skipped_refgap += 1
continue
# create breakpoints and blocks, keeping in mind uncertainty and possible insertion
if caller == 'lumpy' and svtype != 'INS':
# lumpy intervals are not symmetric. POS and END are each the "best guess" for
# the breakpoints
bp = [(pos, pos), (end, end)]
elif svtype != 'INS':
# if (cipos[1] != -cipos[0] or ciend[1] != -ciend[0]) and \
# (pos + cipos[1] < end + ciend[0]):
if (pos + cipos[1] < end + ciend[0]):
bp = [(pos + cipos[0], pos + cipos[1]),
(end + ciend[0], end + ciend[1])]
else:
bp = [(pos, pos), (end, end)]
filterstring += ':BPOVERLAP'
else:
# if cipos[1] != -cipos[0]:
if cipos[1] > cipos[0]:
bp = [(pos + cipos[0], pos + cipos[1])]
else:
bp = [(pos, pos)]
pe = [(x, supptype) for x in range(pe_support)]
# TODO SupportingSplit
splits = []
for i in range(split_support):
aln_tmp = pysam.AlignedSegment()
aln_tmp.qname = i
aln_tmp.is_read1 = True
split_type = supptype + '+'
splits.append(SupportingSplit(aln_tmp, None, None, None, None, split_type))
breakpoints = {x: Breakpoint(x, pe=pe, splits=splits) for x in bp}
slop_left, slop_right = flank_size, flank_size
start = bp[0][0] - slop_left
end = bp[-1][1] + slop_right
cbout = create_blocks(breakpoints, pyinter.IntervalSet(), chrom, start, end, verbosity)
blocks, _, left_bp, right_bp = cbout
if svtype == 'INS':
blocks.append(GenomeInterval(chrom, 0, inslen, is_de_novo=True))
paths = [path, refpath] if is_het else [path, path]
score = 0
coords = (start, end)
scc = seen_coords_count.get(coords, 0)
if scc > 0:
id_extra = chr(ord('a') + scc)
else:
id_extra = ''
seen_coords_count[coords] = scc + 1
this_data = (paths, blocks, left_bp, right_bp, score, filterstring,
id_extra, tagd_extra, tags2_extra)
data.append(this_data)
for svtype, count in svtype_skipped.items():
log.write('skipped_svtype\t{0}\t{1}\n'.format(svtype, count))
log.write('skipped_refgap\t{0}\n'.format(skipped_refgap))
do_sv_processing(data, outdir, reffile, log, verbosity, write_extra)
vcf.close()
log.close()
def add_variants_to_set_from_bed(sample_alignment, bed_dataset):
"""
Given a bed with feature names and a corresponding sample alignment,
create new variant sets for every unique feature name and assign variants
to that fall within these features to the new sets.
E.g. BED:
...
NC_000913 223514 223534 POOR_MAPPING_QUALITY
NC_000913 223542 223734 NO_COVERAGE
NC_000913 223751 224756 POOR_MAPPING_QUALITY
...
Add variants in 223542-223734 to NO_COVERAGE
Add variants in 223751-224756 and 223514-223534 to POOR_MAPPING_QUALITY
"""
# Read in the bed file
bed_dataset_fn = bed_dataset.get_absolute_location()
reference_genome = sample_alignment.alignment_group.reference_genome
experiment_sample = sample_alignment.experiment_sample
# 1. Create a dictionary of disjoint intervals, recursive defaultdict
feature_disj_intervals = defaultdict(
lambda: defaultdict(pyinter.IntervalSet))
variants_to_add = defaultdict(list)
with open(bed_dataset_fn) as bed_dataset_fh:
for i, line in enumerate(bed_dataset_fh):
try:
chrom, start, end, feature = line.strip().split('\t')
# make a new interval from start to end
new_ivl = pyinter.closedopen(int(start), int(end))
# add new ivl to old ivls
feature_disj_intervals[feature][chrom].add(new_ivl)
except:
print ('WARNING: Callable Loci line ' +
'%d: (%s) couldnt be parsed.') % (i, line)
# 2. Associate variants with these intervals
variants = Variant.objects.filter(
variantcallercommondata__alignment_group=\
sample_alignment.alignment_group)
for v in variants:
for feat, chrom_ivls in feature_disj_intervals.items():
# Skip if there is no interval in this chromosome
if v.chromosome.label not in chrom_ivls: continue
if not chrom_ivls[v.chromosome.label]: continue
if v.position in chrom_ivls[v.chromosome.label]:
variants_to_add[feat].append(v)
# 3. Make new variant sets for any features with variants,
# and add the variants to them.
variant_set_to_variant_map = {}
for feat, variants in variants_to_add.items():
(feat_variant_set, created) = VariantSet.objects.get_or_create(
reference_genome=reference_genome,
label=feat)
grouped_uid_dict_list = [{
'sample_uid': experiment_sample.uid,
'variant_uid': v.uid} for v in variants]
variant_uid_to_obj_map = dict([(v.uid,v) for v in variants])
sample_uid_to_obj_map = {experiment_sample.uid: experiment_sample}
_perform_add(grouped_uid_dict_list, feat_variant_set,
variant_uid_to_obj_map, sample_uid_to_obj_map)
variant_set_to_variant_map[feat_variant_set] = variants
return variant_set_to_variant_map
def add_variants_to_set_from_bed(sample_alignment, bed_dataset):
"""
Given a bed with feature names and a corresponding sample alignment,
create new variant sets for every unique feature name and assign variants
to that fall within these features to the new sets.
E.g. BED:
...
NC_000913 223514 223534 POOR_MAPPING_QUALITY
NC_000913 223542 223734 NO_COVERAGE
NC_000913 223751 224756 POOR_MAPPING_QUALITY
...
Add variants in 223542-223734 to NO_COVERAGE
Add variants in 223751-224756 and 223514-223534 to POOR_MAPPING_QUALITY
"""
# Read in the bed file
bed_dataset_fn = bed_dataset.get_absolute_location()
reference_genome = sample_alignment.alignment_group.reference_genome
experiment_sample = sample_alignment.experiment_sample
# 1. Create a dictionary of disjoint intervals, recursive defaultdict
feature_disj_intervals = defaultdict(
lambda: defaultdict(pyinter.IntervalSet))
variants_to_add = defaultdict(list)
with open(bed_dataset_fn) as bed_dataset_fh:
for i, line in enumerate(bed_dataset_fh):
try:
chrom, start, end, feature = line.strip().split('\t')
# make a new interval from start to end
new_ivl = pyinter.closedopen(int(start), int(end))
# add new ivl to old ivls
feature_disj_intervals[feature][chrom].add(new_ivl)
except:
print('WARNING: Callable Loci line ' +
'%d: (%s) couldnt be parsed.') % (i, line)
# 2. Associate variants with these intervals
variants = Variant.objects.filter(
variantcallercommondata__alignment_group=\
sample_alignment.alignment_group)
for v in variants:
for feat, chrom_ivls in feature_disj_intervals.items():
# Skip if there is no interval in this chromosome
if v.chromosome.label not in chrom_ivls: continue
if not chrom_ivls[v.chromosome.label]: continue
if v.position in chrom_ivls[v.chromosome.label]:
variants_to_add[feat].append(v)
# 3. Make new variant sets for any features with variants,
# and add the variants to them.
variant_set_to_variant_map = {}
for feat, variants in variants_to_add.items():
(feat_variant_set, created) = VariantSet.objects.get_or_create(
reference_genome=reference_genome, label=feat)
grouped_uid_dict_list = [{
'sample_uid': experiment_sample.uid,
'variant_uid': v.uid
} for v in variants]
variant_uid_to_obj_map = dict([(v.uid, v) for v in variants])
sample_uid_to_obj_map = {experiment_sample.uid: experiment_sample}
_perform_add(grouped_uid_dict_list, feat_variant_set,
variant_uid_to_obj_map, sample_uid_to_obj_map)
variant_set_to_variant_map[feat_variant_set] = variants
return variant_set_to_variant_map
def create_blocks(breakpoints, gaps, chrom_name, start, end, verbosity):
# create list of blocks between breakpoints
# while adjusting for genome gaps
gap_indices = set()
gap_indices.add(0)
blocks = []
left_breakpoints = []
right_breakpoints = []
breakpoints[(end, end)] = Breakpoint((end, end))
bploc = list(breakpoints.keys())
bploc.sort()
last_end = start
last_breakpoint = Breakpoint((start, start))
for bpl in bploc:
breakpoint = breakpoints[bpl]
if bpl[0] <= start or bpl[1] > end:
continue
iset = pyinter.IntervalSet()
blockinterval = pyinter.closedopen(last_end, bpl[0])
iset.add(blockinterval)
adjusted_blocks = iset.difference(gaps)
adjusted_blocks = sorted(list(adjusted_blocks))
if verbosity > 1:
print('bploc {0}'.format(bpl))
print('bp {0}'.format(breakpoint))
print('blockinterval {0}'.format(blockinterval))
print('adjusted {0}'.format(adjusted_blocks))
for ab in adjusted_blocks:
if ab.lower_value == ab.upper_value: # block completely within a gap
gap_indices.add(len(blocks))
break
else:
if ab.lower_value != blockinterval.lower_value:
gap_indices.add(len(blocks))
left_breakpoint = Breakpoint(
(ab.lower_value, ab.lower_value))
else:
left_breakpoint = last_breakpoint
if ab.upper_value != blockinterval.upper_value:
gap_indices.add(len(blocks) + 1)
right_breakpoint = Breakpoint(
(ab.upper_value, ab.upper_value))
else:
right_breakpoint = breakpoint
if verbosity > 1:
print('adding {0}'.format(
GenomeInterval(chrom_name, ab.lower_value,
ab.upper_value)))
print('\tleft {0}'.format(left_breakpoint))
print('\tright {0}'.format(right_breakpoint))
blocks.append(
GenomeInterval(chrom_name, ab.lower_value, ab.upper_value))
left_breakpoints.append(left_breakpoint)
right_breakpoints.append(right_breakpoint)
last_end = bpl[1]
last_breakpoint = breakpoints[bpl]
gap_indices.add(len(blocks))
gap_indices = sorted(list(gap_indices))
if verbosity > 1:
print('--creating blocks--')
print(breakpoints)
print(blocks)
print(gap_indices)
print(left_breakpoints)
print(right_breakpoints)
return blocks, gap_indices, left_breakpoints, right_breakpoints
def test_add_variants_to_set_from_bed(self):
common_entities = create_common_entities()
project = common_entities['project']
self.ref_genome_1 = common_entities['reference_genome']
alignment_group = AlignmentGroup.objects.create(
label='Alignment 1',
reference_genome=self.ref_genome_1,
aligner=AlignmentGroup.ALIGNER.BWA)
(self.sample_1, created) = ExperimentSample.objects.get_or_create(
project=project, label=SAMPLE_1_LABEL)
sample_alignment = ExperimentSampleToAlignment.objects.create(
alignment_group=alignment_group, experiment_sample=self.sample_1)
# Create variants in the bed regions from best_test.bed
for var_poor_map in range(20):
variant = Variant.objects.create(
type=Variant.TYPE.TRANSITION,
reference_genome=self.ref_genome_1,
chromosome=Chromosome.objects.get(
reference_genome=self.ref_genome_1),
position=random.randint(101, 200),
ref_value='A')
vccd = VariantCallerCommonData.objects.create(
variant=variant,
source_dataset_id=1,
alignment_group=alignment_group,
data={})
for var_no_cov in range(20):
variant = Variant.objects.create(
type=Variant.TYPE.TRANSITION,
reference_genome=self.ref_genome_1,
chromosome=Chromosome.objects.get(
reference_genome=self.ref_genome_1),
position=random.randint(301, 400),
ref_value='A')
vccd = VariantCallerCommonData.objects.create(
variant=variant,
source_dataset_id=1,
alignment_group=alignment_group,
data={})
variant = Variant.objects.create(
type=Variant.TYPE.TRANSITION,
reference_genome=self.ref_genome_1,
chromosome=Chromosome.objects.get(
reference_genome=self.ref_genome_1),
position=random.randint(501, 600),
ref_value='A')
vccd = VariantCallerCommonData.objects.create(
variant=variant,
source_dataset_id=1,
alignment_group=alignment_group,
data={})
new_bed_path = copy_dataset_to_entity_data_dir(
entity=sample_alignment, original_source_location=TEST_BED)
bed_dataset = add_dataset_to_entity(
sample_alignment,
dataset_label=Dataset.TYPE.BED_CALLABLE_LOCI,
dataset_type=Dataset.TYPE.BED_CALLABLE_LOCI,
filesystem_location=new_bed_path)
vs_to_v_map = add_variants_to_set_from_bed(sample_alignment,
bed_dataset)
variant_set_labels = set([vs.label for vs in vs_to_v_map.keys()])
self.assertEqual(set(['POOR_MAPPING_QUALITY', 'NO_COVERAGE']),
variant_set_labels)
for variant_set, variants in vs_to_v_map.items():
for v in variants:
# POOR MAPPING QUAL should be from 101 to 200
if variant_set.label == 'POOR_MAPPING_QUALITY':
self.assertTrue(v.position in pyinter.closedopen(101, 200))
# NO COVERAGE should be from 301 to 400, 501 to 600
elif variant_set.label == 'NO_COVERAGE':
self.assertTrue(v.position in pyinter.IntervalSet([
pyinter.closedopen(301, 400),
pyinter.closedopen(501, 600)
]))
else:
raise AssertionError('bad variant set %s made.' %
variant_set.label)
def len_without_gaps(chrom_name, start, end, gapsfile):
gaps = load_genome_gaps(gapsfile, chrom_name)
region = pyinter.IntervalSet()
region.add(pyinter.closedopen(start, end))
diff = region.difference(gaps)
return sum(x.upper_value - x.lower_value for x in diff)
def test_add_variants_to_set_from_bed(self):
common_entities = create_common_entities()
project = common_entities['project']
self.ref_genome_1 = common_entities['reference_genome']
alignment_group = AlignmentGroup.objects.create(
label='Alignment 1',
reference_genome=self.ref_genome_1,
aligner=AlignmentGroup.ALIGNER.BWA)
(self.sample_1, created) = ExperimentSample.objects.get_or_create(
project=project,
label=SAMPLE_1_LABEL)
sample_alignment = ExperimentSampleToAlignment.objects.create(
alignment_group=alignment_group,
experiment_sample=self.sample_1)
# Create variants in the bed regions from best_test.bed
for var_poor_map in range(20):
variant = Variant.objects.create(
type=Variant.TYPE.TRANSITION,
reference_genome=self.ref_genome_1,
chromosome=Chromosome.objects.get(reference_genome=self.ref_genome_1),
position=random.randint(101,200),
ref_value='A')
vccd = VariantCallerCommonData.objects.create(
variant=variant,
source_dataset_id=1,
alignment_group=alignment_group,
data={}
)
for var_no_cov in range(20):
variant = Variant.objects.create(
type=Variant.TYPE.TRANSITION,
reference_genome=self.ref_genome_1,
chromosome=Chromosome.objects.get(reference_genome=self.ref_genome_1),
position=random.randint(301,400),
ref_value='A')
vccd = VariantCallerCommonData.objects.create(
variant=variant,
source_dataset_id=1,
alignment_group=alignment_group,
data={}
)
variant = Variant.objects.create(
type=Variant.TYPE.TRANSITION,
reference_genome=self.ref_genome_1,
chromosome=Chromosome.objects.get(reference_genome=self.ref_genome_1),
position=random.randint(501,600),
ref_value='A')
vccd = VariantCallerCommonData.objects.create(
variant=variant,
source_dataset_id=1,
alignment_group=alignment_group,
data={}
)
new_bed_path = copy_dataset_to_entity_data_dir(
entity= sample_alignment,
original_source_location= TEST_BED)
bed_dataset = add_dataset_to_entity(sample_alignment,
dataset_label= Dataset.TYPE.BED_CALLABLE_LOCI,
dataset_type= Dataset.TYPE.BED_CALLABLE_LOCI,
filesystem_location= new_bed_path)
vs_to_v_map = add_variants_to_set_from_bed(
sample_alignment, bed_dataset)
variant_set_labels = set([vs.label for vs in vs_to_v_map.keys()])
self.assertEqual(set(['POOR_MAPPING_QUALITY', 'NO_COVERAGE']),
variant_set_labels)
for variant_set, variants in vs_to_v_map.items():
for v in variants:
# POOR MAPPING QUAL should be from 101 to 200
if variant_set.label == 'POOR_MAPPING_QUALITY':
self.assertTrue(v.position in pyinter.closedopen(
101, 200))
# NO COVERAGE should be from 301 to 400, 501 to 600
elif variant_set.label == 'NO_COVERAGE':
self.assertTrue(v.position in pyinter.IntervalSet([
pyinter.closedopen(301,400),
pyinter.closedopen(501,600)]))
else:
raise AssertionError(
'bad variant set %s made.' % variant_set.label)
