Mercurial > repos > drosofff > msp_blastparser_and_hits

annotate BlastParser_and_hits.py @ 0:3959a271cf3f draft

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author drosofff
date Tue, 09 Jun 2015 04:15:34 -0400
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children e0985bad7b92
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0
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1 #!/usr/bin/python
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2 # blastn blastx parser revised debugged: 3-4-2015. Commit issue.
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3 # drosofff@gmail.com
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4
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5 import sys
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6 import argparse
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7 from collections import defaultdict
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8
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9 def Parser():
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10 the_parser = argparse.ArgumentParser()
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11 the_parser.add_argument('--blast', action="store", type=str, help="Path to the blast output (tabular format, 12 column)")
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12 the_parser.add_argument('--sequences', action="store", type=str, help="Path to the fasta file with blasted sequences")
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13 the_parser.add_argument('--fastaOutput', action="store", type=str, help="fasta output file of blast hits")
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14 the_parser.add_argument('--tabularOutput', action="store", type=str, help="tabular output file of blast analysis")
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15 the_parser.add_argument('--flanking', action="store", type=int, help="number of flanking nucleotides added to the hit sequences")
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16 args = the_parser.parse_args()
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17 if not all ( (args.sequences, args.blast, args.fastaOutput, args.tabularOutput) ):
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18 the_parser.error('argument(s) missing, call the -h option of the script')
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19 if not args.flanking:
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20 args.flanking = 0
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21 return args
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22
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23 def median(lst):
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24 lst = sorted(lst)
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25 if len(lst) < 1:
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26 return None
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27 if len(lst) %2 == 1:
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28 return lst[((len(lst)+1)/2)-1]
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29 if len(lst) %2 == 0:
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30 return float(sum(lst[(len(lst)/2)-1:(len(lst)/2)+1]))/2.0
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31
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32 def getfasta (fastafile):
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33 fastadic = {}
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34 for line in open (fastafile):
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35 if line[0] == ">":
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36 header = line[1:-1]
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37 fastadic[header] = ""
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38 else:
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39 fastadic[header] += line
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40 for header in fastadic:
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41 fastadic[header] = "".join(fastadic[header].split("\n"))
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42 return fastadic
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43
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44 def insert_newlines(string, every=60):
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45 lines = []
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46 for i in xrange(0, len(string), every):
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47 lines.append(string[i:i+every])
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48 return '\n'.join(lines)
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49
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50 def getblast (blastfile):
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51 '''blastinfo [0] Percentage of identical matches
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52 blastinfo [1] Alignment length
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53 blastinfo [2] Number of mismatches
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54 blastinfo [3] Number of gap openings
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55 blastinfo [4] Start of alignment in query
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56 blastinfo [5] End of alignment in query
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57 blastinfo [6] Start of alignment in subject (database hit)
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58 blastinfo [7] End of alignment in subject (database hit)
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59 blastinfo [8] Expectation value (E-value)
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60 blastinfo [9] Bit score
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61 blastinfo [10] Subject length (NEED TO BE SPECIFIED WHEN RUNNING BLAST) '''
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62 blastdic = defaultdict (dict)
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63 for line in open (blastfile):
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64 fields = line[:-1].split("\t")
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65 transcript = fields[0]
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66 subject = fields[1]
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67 blastinfo = [float(fields[2]) ] # blastinfo[0]
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68 blastinfo = blastinfo + [int(i) for i in fields[3:10] ] # blastinfo[1:8] insets 1 to 7
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69 blastinfo.append(fields[10]) # blastinfo[8] E-value remains as a string type
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70 blastinfo.append(float(fields[11])) # blastinfo[9] Bit score
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71 blastinfo.append(int(fields[12])) # blastinfo[10] Subject length MUST BE RETRIEVED THROUGH A 13 COLUMN BLAST OUTPUT
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72 try:
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73 blastdic[subject][transcript].append(blastinfo)
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74 except:
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75 blastdic[subject][transcript] = [ blastinfo ]
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76 return blastdic
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77
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78 def getseq (fastadict, transcript, up, down, orientation="direct"):
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79 def reverse (seq):
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80 revdict = {"A":"T","T":"A","G":"C","C":"G","N":"N"}
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81 revseq = [revdict[i] for i in seq[::-1]]
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82 return "".join(revseq)
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83 pickseq = fastadict[transcript][up-1:down]
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84 if orientation == "direct":
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85 return pickseq
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86 else:
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87 return reverse(pickseq)
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88
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89 def subjectCoverage (fastadict, blastdict, subject, QueriesFlankingNucleotides=0):
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90 SubjectCoverageList = []
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91 HitDic = {}
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92 bitScores = []
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93 for transcript in blastdict[subject]:
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94 prefix = "%s--%s_" % (subject, transcript)
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95 hitNumber = 0
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96 for hit in blastdict[subject][transcript]:
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97 hitNumber += 1
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98 suffix = "hit%s_IdMatch=%s,AligLength=%s,E-val=%s" % (hitNumber, hit[0], hit[1], hit[8])
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99 HitDic[prefix+suffix] = GetHitSequence (fastadict, transcript, hit[4], hit[5], QueriesFlankingNucleotides) #query coverage by a hit is in hit[4:6]
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100 SubjectCoverageList += range (min([hit[6], hit[7]]), max([hit[6], hit[7]]) + 1) # subject coverage by a hit is in hit[6:8]
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101 bitScores.append(hit[9])
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102 subjectLength = hit [10] # always the same value for a given subject. Stupid but simple
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103 TotalSubjectCoverage = len ( set (SubjectCoverageList) )
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104 RelativeSubjectCoverage = TotalSubjectCoverage/float(subjectLength)
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105 return HitDic, subjectLength, TotalSubjectCoverage, RelativeSubjectCoverage, max(bitScores), median(bitScores)
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106
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107 def GetHitSequence (fastadict, FastaHeader, leftCoordinate, rightCoordinate, FlankingValue):
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108 if rightCoordinate > leftCoordinate:
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109 polarity = "direct"
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110 else:
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111 polarity = "reverse"
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112 leftCoordinate, rightCoordinate = rightCoordinate, leftCoordinate
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113 if leftCoordinate - FlankingValue > 0:
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114 leftCoordinate -= FlankingValue
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115 else:
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116 leftCoordinate = 1
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117 return getseq (fastadict, FastaHeader, leftCoordinate, rightCoordinate, polarity)
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118
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119 def __main__ ():
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120 args = Parser()
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121 fastadict = getfasta (args.sequences)
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122 Xblastdict = getblast (args.blast)
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123 results = defaultdict(dict)
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124 F = open(args.tabularOutput, "w")
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125 Fasta = open(args.fastaOutput, "w")
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126 for subject in Xblastdict:
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127 results[subject]["HitDic"], results[subject]["subjectLength"], results[subject]["TotalCoverage"], results[subject]["RelativeSubjectCoverage"], results[subject]["maxBitScores"], results[subject]["medianBitScores"] = subjectCoverage(fastadict, Xblastdict, subject, args.flanking)
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128 ## data output
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129 print >>F, "# SeqId\t%Identity\tAlignLength\tStartSubject\tEndSubject\t%QueryHitCov\tE-value\tBitScore\n"
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130 for subject in sorted (results, key=lambda x: results[x]["TotalCoverage"], reverse=True):
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131 print >> F, "#\n# %s" % subject
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132 print >> F, "# Suject Length: %s" % (results[subject]["subjectLength"])
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133 print >> F, "# Total Subject Coverage: %s" % (results[subject]["TotalCoverage"])
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134 print >> F, "# Relative Subject Coverage: %s" % (results[subject]["RelativeSubjectCoverage"])
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135 print >> F, "# Maximum Bit Score: %s" % (results[subject]["maxBitScores"])
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136 print >> F, "# Median Bit Score: %s" % (results[subject]["medianBitScores"])
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137 for header in results[subject]["HitDic"]:
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138 print >> Fasta, ">%s\n%s" % (header, insert_newlines(results[subject]["HitDic"][header]) )
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139 for transcript in Xblastdict[subject]:
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140 transcriptSize = float(len(fastadict[transcript]))
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141 for hit in Xblastdict[subject][transcript]:
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142 percentIdentity, alignLenght, subjectStart, subjectEnd, queryCov = hit[0], hit[1], hit[6], hit[7], "%.1f" % (abs(hit[5]-hit[4])/transcriptSize*100)
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143 Eval, BitScore = hit[8], hit[9]
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144 info = [transcript] + [percentIdentity, alignLenght, subjectStart, subjectEnd, queryCov, Eval, BitScore]
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145 info = [str(i) for i in info]
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146 info = "\t".join(info)
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147 print >> F, info
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148 print >> Fasta, ""
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149 F.close()
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150 Fasta.close()
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151
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152 if __name__=="__main__": __main__()