root/galaxy-central/tools/maf/vcf_to_maf_customtrack.py @ 3

リビジョン 2, 6.9 KB (コミッタ: hatakeyama, 14 年 前)

import galaxy-central
行番号 
1#Dan Blankenberg
2from optparse import OptionParser
3import sys
4import galaxy_utils.sequence.vcf
5
6from galaxy import eggs
7import pkg_resources; pkg_resources.require( "bx-python" )
8import bx.align.maf
9
10UNKNOWN_NUCLEOTIDE = '*'
11
12class PopulationVCFParser( object ):
13    def __init__( self, reader, name ):
14        self.reader = reader
15        self.name = name
16        self.counter = 0
17    def next( self ):
18        rval = []
19        vc = self.reader.next()
20        for i, allele in enumerate( vc.alt ):
21            rval.append( ( '%s_%i.%i' % ( self.name, i + 1, self.counter + 1 ), allele ) )
22        self.counter += 1
23        return ( vc, rval )
24    def __iter__( self ):
25        while True:
26            yield self.next()
27
28class SampleVCFParser( object ):
29    def __init__( self, reader ):
30        self.reader = reader
31        self.counter = 0
32    def next( self ):
33        rval = []
34        vc = self.reader.next()
35        alleles = [ vc.ref ] + vc.alt
36       
37        if 'GT' in vc.format:
38            gt_index = vc.format.index( 'GT' )
39            for sample_name, sample_value in zip( vc.sample_names, vc.sample_values ):
40                gt_indexes = []
41                for i in sample_value[ gt_index ].replace( '|', '/' ).replace( '\\', '/' ).split( '/' ): #Do we need to consider phase here?
42                    try:
43                        gt_indexes.append( int( i ) )
44                    except:
45                        gt_indexes.append( None )
46                for i, allele_i in enumerate( gt_indexes ):
47                    if allele_i is not None:
48                        rval.append( ( '%s_%i.%i' % ( sample_name, i + 1, self.counter + 1 ), alleles[ allele_i ] ) )
49        self.counter += 1
50        return ( vc, rval )
51    def __iter__( self ):
52        while True:
53            yield self.next()
54
55def main():
56    usage = "usage: %prog [options] output_file dbkey inputfile pop_name"
57    parser = OptionParser( usage=usage )
58    parser.add_option( "-p", "--population", action="store_true", dest="population", default=False, help="Create MAF on a per population basis")
59    parser.add_option( "-s", "--sample", action="store_true", dest="sample", default=False, help="Create MAF on a per sample basis")
60    parser.add_option( "-n", "--name", dest="name", default='Unknown Custom Track', help="Name for Custom Track")
61    parser.add_option( "-g", "--galaxy", action="store_true", dest="galaxy", default=False, help="Tool is being executed by Galaxy (adds extra error messaging).")
62   
63
64    ( options, args ) = parser.parse_args()
65   
66    if len ( args ) < 3:
67        if options.galaxy:
68            print >>sys.stderr, "It appears that you forgot to specify an input VCF file, click 'Add new VCF...' to add at least input.\n"
69        parser.error( "Need to specify an output file, a dbkey and at least one input file" )
70   
71    if not ( options.population ^ options.sample ):
72        parser.error( 'You must specify either a per population conversion or a per sample conversion, but not both' )
73   
74    out = open( args.pop(0), 'wb' )
75    out.write( 'track name="%s" visibility=pack\n' %  options.name.replace( "\"", "'" ) )
76   
77    maf_writer = bx.align.maf.Writer( out )
78   
79    dbkey = args.pop(0)
80   
81    vcf_files = []
82    if options.population:
83        i = 0
84        while args:
85            filename = args.pop( 0 )
86            pop_name = args.pop( 0 ).replace( ' ', '_' )
87            if not pop_name:
88                pop_name = 'population_%i' % ( i + 1 )
89            vcf_files.append( PopulationVCFParser( galaxy_utils.sequence.vcf.Reader( open( filename ) ), pop_name  ) )
90            i += 1
91    else:
92        while args:
93            filename = args.pop( 0 )
94            vcf_files.append( SampleVCFParser( galaxy_utils.sequence.vcf.Reader( open( filename ) ) ) )
95   
96    non_spec_skipped = 0
97    for vcf_file in vcf_files:
98        for vc, variants in vcf_file:
99            num_ins = 0
100            num_dels = 0
101            for variant_name, variant_text in variants:
102                if 'D' in variant_text:
103                    num_dels = max( num_dels, int( variant_text[1:] ) )
104                elif 'I' in variant_text:
105                    num_ins = max( num_ins, len( variant_text ) - 1 )
106           
107            alignment = bx.align.maf.Alignment()
108            ref_text = vc.ref + '-' * num_ins + UNKNOWN_NUCLEOTIDE * ( num_dels - len( vc.ref ) )
109            start_pos = vc.pos - 1
110            if num_dels and start_pos:
111                ref_text = UNKNOWN_NUCLEOTIDE + ref_text
112                start_pos -= 1
113            alignment.add_component( bx.align.maf.Component( src='%s.%s%s' % (
114                 dbkey, ("chr" if not vc.chrom.startswith("chr") else ""), vc.chrom ),
115                 start = start_pos, size = len( ref_text.replace( '-', '' ) ),
116                 strand = '+', src_size = start_pos + len( ref_text ),
117                 text = ref_text ) )
118            for variant_name, variant_text in variants:
119                #FIXME:
120                ## skip non-spec. compliant data, see: http://1000genomes.org/wiki/doku.php?id=1000_genomes:analysis:vcf3.3 for format spec
121                ## this check is due to data having indels not represented in the published format spec,
122                ## e.g. 1000 genomes pilot 1 indel data: ftp://ftp-trace.ncbi.nih.gov/1000genomes/ftp/pilot_data/release/2010_03/pilot1/indels/CEU.SRP000031.2010_03.indels.sites.vcf.gz
123                if variant_text and variant_text[0] in [ '-', '+' ]:
124                    non_spec_skipped += 1
125                    continue
126               
127                #do we need a left padding unknown nucleotide (do we have deletions)?
128                if num_dels and start_pos:
129                    var_text = UNKNOWN_NUCLEOTIDE
130                else:
131                    var_text = ''
132                if 'D' in variant_text:
133                    cur_num_del = int( variant_text[1:] )
134                    pre_del = min( len( vc.ref ), cur_num_del )
135                    post_del = cur_num_del - pre_del
136                    var_text = var_text + '-' * pre_del + '-' * num_ins + '-' * post_del
137                    var_text = var_text + UNKNOWN_NUCLEOTIDE * ( len( ref_text ) - len( var_text ) )
138                elif 'I' in variant_text:
139                    cur_num_ins = len( variant_text ) - 1
140                    var_text = var_text + vc.ref + variant_text[1:] + '-' * ( num_ins - cur_num_ins ) + UNKNOWN_NUCLEOTIDE * max( 0, ( num_dels - 1 ) )
141                else:
142                    var_text = var_text + variant_text + '-' * num_ins + UNKNOWN_NUCLEOTIDE * ( num_dels - len( vc.ref ) )   
143                alignment.add_component( bx.align.maf.Component( src=variant_name, start = 0, size = len( var_text.replace( '-', '' ) ), strand = '+', src_size = len( var_text.replace( '-', '' ) ), text = var_text ) )
144            maf_writer.write( alignment )
145
146    maf_writer.close()
147   
148    if non_spec_skipped:
149        print 'Skipped %i non-specification compliant indels.' % non_spec_skipped
150
151if __name__ == "__main__": main()
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