def pos_counter_by_pos(bam_fpath, positions):
alignmentfile = AlignmentFile(bam_fpath)
ref_name_index = {}
for pileup_col in alignmentfile.pileup():
ref_id = pileup_col.reference_id
ref_pos = pileup_col.reference_pos
ref_name = ref_name_index.get(ref_id, alignmentfile.getrname(ref_id))
position = (ref_name, ref_pos)
if position in positions:
pos_counter = Counter()
print position
for pileup_read in pileup_col.pileups:
alignement = pileup_read.alignment
blocks = alignement.get_blocks()
if pileup_read.alignment.is_reverse:
base_pos = (pileup_read.alignment.query_length -
pileup_read.query_position - 1)
else:
base_pos = pileup_read.query_position
#
# base_pos = pileup_read.query_position
print base_pos, pileup_read.alignment.qname
pos_counter[base_pos] += 1
yield pos_counter
def downgrade_read_edges(in_fpath,
out_fpath,
size,
qual_to_substract=QUAL_TO_SUBSTRACT):
in_sam = AlignmentFile(in_fpath)
out_sam = AlignmentFile(out_fpath, 'wb', template=in_sam)
for aligned_read in in_sam:
_downgrade_edge_qualities(aligned_read,
size,
qual_to_substract=qual_to_substract)
out_sam.write(aligned_read)
def downgrade_read_edges(in_fpath,
out_fpath,
size,
qual_to_substract=QUAL_TO_SUBSTRACT):
in_sam = AlignmentFile(in_fpath)
out_sam = AlignmentFile(out_fpath, 'wb', template=in_sam)
for aligned_read in in_sam:
if (aligned_read.has_tag(LEFT_DOWNGRADED_TAG)
or aligned_read.has_tag(RIGTH_DOWNGRADED_TAG)):
raise RuntimeError('Edge qualities already downgraded\n')
_downgrade_edge_qualities(aligned_read,
size,
qual_to_substract=qual_to_substract)
out_sam.write(aligned_read)
def classify_mapped_reads(bam_fhand,
mate_distance,
settings=get_setting('CHIMERAS_SETTINGS')):
'''It classifies sequences from bam file in chimeric, unknown and
non chimeric, according to its distance and orientation in the reference
sequence'''
bamfile = AlignmentFile(bam_fhand.name)
# settings. Include in function properties with default values
max_clipping = settings['MAX_CLIPPING']
max_pe_len = settings['MAX_PE_LEN']
variation = settings['MATE_DISTANCE_VARIATION']
mate_length_range = [mate_distance - variation, mate_distance + variation]
reference_lengths = _get_ref_lengths(bamfile)
# It tries to find out the kind of each pair of sequences
for grouped_mates in _group_alignments_reads_by_qname(bamfile):
mates_alignments = _split_mates(grouped_mates)
if _mates_are_not_chimeric(mates_alignments, max_clipping,
mate_length_range, bamfile,
reference_lengths):
kind = NON_CHIMERIC
elif _mates_are_chimeric(mates_alignments, bamfile, max_clipping,
max_pe_len, reference_lengths):
kind = CHIMERA
else:
kind = UNKNOWN
pair = [
alignedread_to_seqitem(_get_primary_alignment(mates))
for mates in mates_alignments
]
if None not in pair:
yield pair, kind
def mapped_count_by_rg(bam_fpaths, mapqx=None):
do_mapqx = True if mapqx is not None else False
counter_by_rg = {}
for bam_fpath in bam_fpaths:
bam = AlignmentFile(bam_fpath, 'rb')
readgroups = get_bam_readgroups(bam)
if readgroups is None:
bam_basename = os.path.splitext(os.path.basename(bam_fpath))[0]
readgroups = [bam_basename]
else:
readgroups = [rg['ID'] for rg in readgroups]
for readgroup in readgroups:
counter = IntCounter({'unmapped': 0, 'mapped': 0})
if do_mapqx:
counter['bigger_mapqx'] = 0
counter_by_rg[readgroup] = counter
for read in bam:
rg = get_rg_from_alignedread(read)
if rg is None:
rg = bam_basename
if do_mapqx and read.mapq >= mapqx:
counter_by_rg[rg]['bigger_mapqx'] += 1
if read.is_unmapped:
counter_by_rg[rg]['unmapped'] += 1
else:
counter_by_rg[rg]['mapped'] += 1
return counter_by_rg
def calculate_distance_distribution_in_bam(bam_fhand,
max_clipping,
max_distance=None):
bamfile = AlignmentFile(bam_fhand.name)
stats = {
'outies': IntCounter(),
'innies': IntCounter(),
'others': IntCounter()
}
for grouped_mates in _group_alignments_reads_by_qname(bamfile):
mates = _split_mates(grouped_mates)
for aligned_read1 in _get_totally_mapped_alignments(
mates[0], max_clipping):
for aligned_read2 in _get_totally_mapped_alignments(
mates[1], max_clipping):
if aligned_read1.rname == aligned_read2.rname:
aligned_reads = [aligned_read1, aligned_read2]
distance = _find_distance(aligned_reads)
if _mates_are_outies(aligned_reads):
kind = 'outies'
elif _mates_are_innies(aligned_reads):
kind = 'innies'
else:
kind = 'others'
if max_distance is None or max_distance > distance:
stats[kind][distance] += 1
return stats
def __call__(self, trim_packet):
'It trims the seqs'
self._pre_trim(trim_packet)
trimmed_seqs = []
bamfile = AlignmentFile(self._bam_fhand.name)
for grouped_mates in _group_alignments_reads_by_qname(bamfile):
for aligned_reads in _split_mates(grouped_mates):
trimmed_seqs.append([self._do_trim(aligned_reads)])
self._post_trim()
return {
SEQS_PASSED: trimmed_seqs,
ORPHAN_SEQS: trim_packet[ORPHAN_SEQS]
}
def pos_counter_by_pos(bam_fpath, positions):
alignmentfile = AlignmentFile(bam_fpath)
ref_name_index = {}
for pileup_col in alignmentfile.pileup():
ref_id = pileup_col.reference_id
ref_pos = pileup_col.reference_pos
ref_name = ref_name_index.get(ref_id, alignmentfile.getrname(ref_id))
position = (ref_name, ref_pos)
if position in positions:
pos_counter = Counter()
print position
for pileup_read in pileup_col.pileups:
alignement = pileup_read.alignment
blocks = alignement.get_blocks()
if pileup_read.alignment.is_reverse:
base_pos = pileup_read.alignment.query_length - pileup_read.query_position - 1
else:
base_pos = pileup_read.query_position
#
# base_pos = pileup_read.query_position
print base_pos, pileup_read.alignment.qname
pos_counter[base_pos] += 1
yield pos_counter
def sort_by_position_in_ref(in_fhand, index_fpath, directory=None,
tempdir=None):
# changed to bwa mem from bowtie, test doesn't work well, check it out
in_fpath = in_fhand.name
file_format = get_format(open(in_fpath))
extra_params = ['--very-fast']
if 'fasta' in file_format:
extra_params.append('-f')
bowtie2_process = map_with_bowtie2(index_fpath, paired_fpaths=None,
unpaired_fpath=in_fpath,
extra_params=extra_params)
out_fhand = NamedTemporaryFile()
map_process_to_sortedbam(bowtie2_process, out_fhand.name, tempdir=tempdir)
samfile = AlignmentFile(out_fhand.name)
for aligned_read in samfile:
yield alignedread_to_seqitem(aligned_read)
def _prepare_bams(self, bam_fpaths):
bams = []
rgs = {}
for idx, bam_fpath in enumerate(bam_fpaths):
bam = AlignmentFile(bam_fpath)
rgs_ = get_bam_readgroups(bam)
if rgs_ is None:
rgs_ = [{'ID': None,
self.bam_rg_field_for_vcf_sample: str(None)}]
bams.append({'fpath': bam_fpath, 'rgs': rgs_})
for read_group in rgs_:
read_group['bam'] = idx
rgs[read_group['ID']] = read_group
self._bams = bams
self._rgs = rgs
# We have to assume that all bmas have the same references
ref_lens = {ref: le_ for ref, le_ in zip(bam.references, bam.lengths)}
self._ref_lens = ref_lens
def calculate_distance_distribution(interleave_fhand,
index_fpath,
max_clipping,
max_distance=None,
tempdir=None,
threads=None):
bam_fhand = NamedTemporaryFile(suffix='.bam')
extra_params = ['-a', '-M']
bwa = map_with_bwamem(index_fpath,
interleave_fpath=interleave_fhand.name,
extra_params=extra_params,
threads=threads)
map_process_to_sortedbam(bwa,
bam_fhand.name,
key='queryname',
tempdir=tempdir)
bamfile = AlignmentFile(bam_fhand.name)
stats = {
'outies': IntCounter(),
'innies': IntCounter(),
'others': IntCounter()
}
for grouped_mates in _group_alignments_reads_by_qname(bamfile):
mates = _split_mates(grouped_mates)
for aligned_read1 in _get_totally_mapped_alignments(
mates[0], max_clipping):
for aligned_read2 in _get_totally_mapped_alignments(
mates[1], max_clipping):
if aligned_read1.rname == aligned_read2.rname:
aligned_reads = [aligned_read1, aligned_read2]
distance = _find_distance(aligned_reads)
if _mates_are_outies(aligned_reads):
kind = 'outies'
elif _mates_are_innies(aligned_reads):
kind = 'innies'
else:
kind = 'others'
if max_distance is None or max_distance > distance:
stats[kind][distance] += 1
return stats
def _get_mapped_reads(bam_fpath, min_mapq=0):
bam = AlignmentFile(bam_fpath)
return [
read.qname for read in bam
if not read.is_unmapped and (not min_mapq or read.mapq > min_mapq)
]
