def __init__(self, entries, format = 'Limited', bigBed=False):
"""
Create a BedFile instance.
:param entries: an iterable of entries or a filename
:param format: the format of the BED file
"""
self.format = format
if bigBed:
self.chroms = bigbed.readBigBed(entries)
elif isinstance(entries, str): # filename
try:
self.chroms = readBedFile(entries, format)
except UnicodeDecodeError:
self.chroms = bigbed.readBigBed(entries)
else:
self.chroms = dict()
if format.lower().startswith('bedpe'):
for entry in entries:
for num in range(1, 3):
if num == 1:
tree = self.chroms.get(entry.chrom1)
if not tree:
tree = ival.IntervalTree()
self.chroms[entry.chrom1] = tree
iv = ival.Interval(entry.chromStart1, entry.chromEnd1)
tree.put(iv, entry)
elif num == 2:
tree = self.chroms.get(entry.chrom2)
if not tree:
tree = ival.IntervalTree()
self.chroms[entry.chrom2] = tree
# put the entry in the interval tree for the appropriate chromosome
iv = ival.Interval(entry.chromStart2, entry.chromEnd2)
tree.put(iv, entry)
else:
for entry in entries:
# check if the chromosome has been seen before
tree = self.chroms.get(entry.chrom)
if not tree:
tree = ival.IntervalTree()
self.chroms[entry.chrom] = tree
# put the entry in the interval tree for the appropriate chromosome
iv = ival.Interval(entry.chromStart, entry.chromEnd)
tree.put(iv, entry)
def poolBED(self, bedfile):
for entry in bedfile:
# check if the chromosome has been seen before
tree = self.chroms.get(entry.chrom)
if not tree:
tree = ival.IntervalTree()
self.chroms[entry.chrom] = tree
# put the entry in the interval tree for the appropriate chromosome
iv = ival.Interval(entry.chromStart, entry.chromEnd)
tree.put(iv, entry)
def readBigBed(filename):
file = pyBigWig.open(filename)
chroms = dict()
if file.isBigBed():
if file.SQL().decode('utf8').lower().find(
'narrowpeak') != -1 or file.SQL().decode('utf8').lower().find(
'broadpeak') != -1:
for chrom in file.chroms():
entries = file.entries(chrom, 0, file.chroms(chrom))
for entry in entries:
try:
words = entry[2].strip().split()
chromStart = int(entry[0])
chromEnd = int(entry[1])
bed_entry = bed.BedEntry(chrom, chromStart, chromEnd)
if len(words) >= 7: # narrowpeaks
bed_entry.addOption(name=words[0],
score=int(words[1]),
strand=words[2],
signalValue=float(words[3]),
pValue=float(words[4]),
qValue=float(words[5]),
peak=int(words[6]))
else: # broadpeaks
bed_entry.addOption(name=words[0],
score=int(words[1]),
strand=words[2],
signalValue=float(words[3]),
pValue=float(words[4]),
qValue=float(words[5]))
# check if the chromosome has been seen before
tree = chroms.get(chrom)
if not tree:
tree = ival.IntervalTree()
chroms[chrom] = tree
# put the entry in the interval tree for the appropriate chromosome
iv = ival.Interval(bed_entry.chromStart,
bed_entry.chromEnd)
tree.put(iv, bed_entry)
except RuntimeError as e:
raise RuntimeError('Error in BIGBED file (%s)' %
(e.strerror))
else:
print("BigBed file not ENCODE narrowPeak or broadPeak")
file.close()
return chroms
def __contains__(self, item):
if isinstance(item, BedEntry):
tree = self.chroms.get(item.chrom)
if tree is None:
return False
else:
return ival.Interval(item.chromStart, item.chromEnd) in tree
elif isinstance(item, BedPE):
tree1 = self.chroms.get(item.chrom1)
tree2 = self.chroms.get(item.chrom2)
container = []
if tree1 is None:
container.append(False)
else:
container.append(ival.Interval(item.chromStart1, item.chromEnd1) in tree1)
if tree2 is None:
container.append(False)
else:
container.append(ival.Interval(item.chromStart2, item. chromEnd2) in tree2)
return container
else:
return False
def getClosest(self, item):
if isinstance(item, BedEntry):
tree = self.chroms.get(item.chrom)
if tree is None:
return None
else:
iv = ival.Interval(item.chromStart, item.chromEnd)
node = tree.closest(iv)
if node is not None:
return node.values
else:
return None
elif isinstance(item, BedPE):
tree1 = self.chroms.get(item.chrom1)
tree2 = self.chroms.get(item.chrom2)
container = []
if tree1 is None:
container.append(None)
else:
iv = ival.Interval(item.chromStart1, item.chromEnd1)
node = tree1.closest(iv)
if node is not None:
container.append(node.values)
else:
container.append(None)
if tree2 is None:
container.append(None)
else:
iv = ival.Interval(item.chromStart1, item.chromEnd1)
node = tree2.closest(iv)
if node is not None:
container.append(node.values)
else:
container.append(None)
return container
else:
return None
def getOverlap(self, item):
if isinstance(item, BedEntry):
tree = self.chroms.get(item.chrom)
if tree is None: return None
else:
iv = ival.Interval(item.chromStart, item.chromEnd)
res = tree.isectall(iv)
ret = []
for r in res:
ret.extend(r.values)
return ret
elif isinstance(item, BedPE):
tree1 = self.chroms.get(item.chrom1)
tree2 = self.chroms.get(item.chrom2)
container = []
if tree1 is None:
container.append(None)
else:
iv = ival.Interval(item.chromStart1, item.chromEnd1)
res = tree1.isectall(iv)
ret = []
for r in res:
ret.extend(r.values)
container.append(ret)
if tree2 is None:
container.append(None)
else:
iv = ival.Interval(item.chromStart2, item.chromEnd2)
res = tree2.isectall(iv)
ret = []
for r in res:
ret.extend(r.values)
container.append(ret)
return container
else:
return None
def readBedFile(filename, format = 'Limited'):
""" Read a BED file.
format: specifies the format of the file,
"Limited", e.g.
chr22 1000 5000
chr22 2000 6000
"Optional", e.g.
track name=pairedReads description="Clone Paired Reads" useScore=1
chr22 1000 5000 cloneA 960 + 1000 5000 0 2 567,488, 0,3512
chr22 2000 6000 cloneB 900 - 2000 6000 0 2 433,399, 0,3601
...
(also handles the Limited + score, and BED6 format)
"Peaks", e.g.
chr1 569780 569930 . 0 . 19 6.07811 -1 -1
chr1 713300 713450 . 0 . 54 49.1167 -1 -1
"Strand", e.g.
chr4 185772359 185772424 -
chr18 20513381 20513401 +
also supports a 5th label field
chr5 20611949 20611949 + ENSG00000251629_20611949
chr3 42187863 42187863 - ENSG00000234562_42187863
"Summit", e.g.
# d = 130
chr start end length summit tags -10*log10(pvalue) fold_enrichment FDR(%)
chr1 8250 8671 422 286 46 145.84 11.68 0.51
chr1 36382 36984 603 405 46 315.23 27.05 0.24
"CCAT", e.g.
chr8 94747805 94747070 94749250 525 3 21.519196 0.002000
chr17 55277895 55277070 55279280 560 18 21.283333 0.002000
"Cropped", e.g.
chr1 851602 10
chr1 921184 18
chr1 931838 9
"BedPE", e.g.
chrom1 chromStart1 chromEnd1 chrom2 chromStart2 chromEnd2 + any number of additional fields
chr1 85617 86100 chr1 120030 125039
chr2 73891 74871 chr5 12709 12990
"""
f = open(filename)
row = 0
acceptHeaderRows = 1
headerRow = None
sissrs = False
gem = False
start = False
chroms = dict()
for line in f:
row += 1
words = line.strip().split()
if len(words) == 0:
continue
if words[0].strip().startswith('='):
sissrs = True
continue
if words[0].strip().startswith('Position'):
gem = True
continue
if sissrs:
if words[0].strip().startswith('-'):
start = True
continue
elif start:
chrom = words[0]
chromStart = int(words[1])
chromEnd = int(words[2])
entry = BedEntry(chrom, chromStart, chromEnd)
entry.addOption(signalValue=int(words[3]), name = " ", score = int(words[3]), strand = '.',
pValue = float(-1), qValue = float(-1), peak = int(-1))
# check if the chromosome has been seen before
tree = chroms.get(chrom)
if not tree:
tree = ival.IntervalTree()
chroms[chrom] = tree
# put the entry in the interval tree for the appropriate chromosome
iv = ival.Interval(entry.chromStart, entry.chromEnd)
tree.put(iv, entry)
else:
continue
elif gem:
chrom, centre = words[0].split(':')
centre = int(centre)
chromStart = centre - 50
chromEnd = centre + 50
entry = BedEntry(chrom, chromStart, chromEnd)
entry.addOption(signalValue=float(words[1]), name=" ", score=float(words[7]), strand=words[13], peak=centre,
pValue=float(words[6]), qValue=float(words[5]))
tree = chroms.get(chrom)
if not tree:
tree = ival.IntervalTree()
chroms[chrom] = tree
# put the entry in the interval tree for the appropriate chromosome
iv = ival.Interval(entry.chromStart, entry.chromEnd)
tree.put(iv, entry)
else:
if len(words) == 0:
continue # ignore empty lines
if words[0].strip().startswith('#'):
continue # comment
if words[0].strip().startswith('browser'):
continue # ignore
if words[0].strip().startswith('track'):
continue # ignore
if words[1].strip().startswith('start'):
continue # ignore
try:
if format.lower().startswith('bedpe'):
chrom1 = words[0]
chromStart1 = int(words[1])
chromEnd1 = int(words[2])
chrom2 = words[3]
chromStart2 = int(words[4])
chromEnd2 = int(words[5])
entry = BedPE(chrom1, chromStart1, chromEnd1, chrom2, chromStart2, chromEnd2)
if len(words) == 8:
entry.addOption(PETs=int(words[6]), pValue=float(words[7]))
if len(words) == 13:
entry.addOption(name1=words[6], name2=words[7], depth1=int(words[8]), depth2=int(words[9]),
PETs=int(words[10]), pValue=float(words[11]), fdr=float(words[12]))
if chrom1 == chrom2:
tree = chroms.get(chrom1)
if not tree:
tree = ival.IntervalTree()
chroms[chrom1] = tree
iv1 = ival.Interval(entry.chromStart1, entry.chromEnd1)
iv2 = ival.Interval(entry.chromStart2, entry.chromEnd2)
tree.put(iv1, entry)
tree.put(iv2, entry)
else:
tree1 = chroms.get(chrom1)
tree2 = chroms.get(chrom2)
if not tree1:
tree1 = ival.IntervalTree()
chroms[chrom1] = tree1
if not tree2:
tree2 = ival.IntervalTree()
chroms[chrom2] = tree2
# put the entry in the interval tree for the appropriate chromosome
iv1 = ival.Interval(entry.chromStart1, entry.chromEnd1)
iv2 = ival.Interval(entry.chromStart2, entry.chromEnd2)
tree1.put(iv1, entry)
tree2.put(iv2, entry)
else:
chrom = words[0]
if format.lower().startswith('ccat'):
chromStart = int(words[2])
chromEnd = int(words[3])
else: # all other standard BED formats
try:
chromStart = int(words[1])
chromEnd = int(words[2])
except ValueError:
print(words)
continue
entry = BedEntry(chrom, chromStart, chromEnd)
if format.lower().startswith('opt'):
if len(words) >= 9:
entry.addOption(name = words[3], score = float(words[4]), strand = words[5],
thickStart = int(words[6]), thickEnd = int(words[7]), itemRgb = words[8])
elif len(words) >= 6:
entry.addOption(name = words[3], score = float(words[4]), strand = words[5])
elif len(words) >= 5:
entry.addOption(name = words[3], score = float(words[4]))
elif len(words) >= 4:
entry.addOption(name = words[3])
else:
entry.addOption(name = '.', score = int(words[3]), strand = '.')
elif format.lower().startswith('bed6'):
entry.addOption(name=words[3], score=float(words[4]), strand=words[5])
elif format.lower().startswith('strand'):
if len(words) >= 4: # properly formatted
entry.addOption(strand = words[3])
if len(words) >= 5:
entry.addOption(name = words[4])
elif format.lower().startswith('peak'):
if len(words) >= 10: # narrowpeaks
entry.addOption(name = words[3], score = int(words[4]), strand = words[5],
signalValue = float(words[6]), pValue = float(words[7]),
qValue = float(words[8]), peak = int(words[9]))
else: # broadpeaks
entry.addOption(name = words[3], score = int(words[4]), strand = words[5],
signalValue = float(words[6]), pValue = float(words[7]),
qValue = float(words[8]))
elif format.lower().startswith('rp'):
entry.addOption(name=words[3], score=int(words[4]), strand=words[5],
signalValue=float(words[6]), pValue=float(words[7]),
qValue=float(words[8]), rank=[float(r) for r in list(words[9].split(","))])
elif format.lower().startswith('idr'):
entry.addOption(name=words[3], score=int(words[4]), strand=words[5],
signalValue=float(words[6]), pValue=float(words[7]),
qValue=float(words[8]))
elif format.lower().startswith('2idr'):
#For IDR input with actual IDR values
entry.addOption(name=words[3], pValue=float(words[9]),
qValue=float(words[10]))
elif format.lower().startswith('summit'):
if len(words) >= 9:
entry.addOption(summit = int(words[4]), tags = int(words[5]), pValue = float(words[6]),
fold = float(words[7]), fdr = float(words[8]))
else:
entry.addOption(summit = int(words[4]), tags = int(words[5]),
pValue = float(words[6]), fold = float(words[7]))
elif format.lower().startswith('ccat'):
entry.addOption(summit = int(words[1]) - entry.chromStart, tags = int(words[4]), bg = int(words[5]),
zscore = float(words[6]), fdr = float(words[7]), name = '.',
score = int(words[4]), strand = '.')
elif format.lower().startswith('crop'):
entry.addOption(score = int(words[2]), name = '.', strand = '.')
entry.chromEnd = entry.chromStart + 1
elif format.lower().startswith('bed12'):
entry.addOption(name=words[3], score=float(words[4]), strand=words[5], thickStart=int(words[6]),
thickEnd=int(words[7]), itemRgb=words[8], blockCount=int(words[9]),
blockSizes=words[10], blockStarts=words[11])
elif format.lower().startswith('TSS'):
entry.addOption(name=str(words[3]), gene=str(words[4]), strand=words[5])
elif format.lower().startswith('mspc'):
entry.addOption(name=str(words[3]), signalValue=float(words[4]))
# check if the chromosome has been seen before
tree = chroms.get(chrom)
if not tree:
tree = ival.IntervalTree()
chroms[chrom] = tree
# put the entry in the interval tree for the appropriate chromosome
iv = ival.Interval(entry.chromStart, entry.chromEnd)
tree.put(iv, entry)
except RuntimeError as e:
if not acceptHeaderRows:
raise RuntimeError('Error in BED file at row %d (%s)' % (row, e.strerror))
else:
headerRow = words
acceptHeaderRows -= 1 # count down the number of header rows that can occur
f.close()
return chroms
def getInterval(self):
return ival.Interval(self.chromStart, self.chromEnd)
def getInterval(self):
return [ival.Interval(self.chromStart1, self.chromEnd1), ival.Interval(self.chromStart2, self.chromEnd2)]
