def confirmcanonicalsplicesites(sequence,gfflist,exon_fmethod=None,verbose=False):
"""
"""
# sequence has original orientation, but exon coords may have been transferred to other strand
onlycanonical = True
warnings = []
exons = filtergffs4fmethod(gfflist,exon_fmethod)
for i in range(1,len(exons)):
donor,accep = exons[i-1:i+1]
dSeq = sequence[donor[4]:donor[4]+2].upper()
aSeq = sequence[accep[3]-3:accep[3]-1].upper()
if dSeq not in CANONICAL_DONOR_SITES:
onlycanonical = False
if dSeq not in NON_CANONICAL_DONOR_SITES:
warnings.append( ImplausibleSpliceSiteWarning("Donor:"+dSeq) )
else:
warnings.append( NonCanonicalSpliceSiteWarning("Donor:"+dSeq) )
if verbose: print warnings[-1]
if aSeq not in CANONICAL_ACCEPTOR_SITES:
warnings.append( ImplausibleSpliceSiteWarning("Acceptor:"+aSeq) )
onlycanonical = False
if verbose: print warnings[-1]
# return the status of the observed splice sites
return onlycanonical, warnings
def create_gene_utrs(gene_gff_list):
"""
Create UTR tracks for an (annotated) gene
@type gene_gff_list: list
@param gene_gff_list: list with gff tuples of the (annotated) gene
@rtype utrs: list
@return utrs: list with gff tuples of the UTR tracks
@attention: requires global variables GFF_CDS_FMETHOD, GFF_EXON_FMETHOD
@attention: requires global variables GFF_UTR5_FSOURCE, GFF_UTR5_FMETHOD
@attention: requires global variables GFF_UTR3_FSOURCE, GFF_UTR3_FMETHOD
"""
# make sets of unigene coordinates
cdscoords = gffs2coordset(gene_gff_list,fmethod=[GFF_CDS_FMETHOD])
exoncoords = gffs2coordset(gene_gff_list,fmethod=[GFF_EXON_FMETHOD])
# return list with UTR tracks
utrs = []
# create a list with 5'UTR coordinates
if cdscoords and exoncoords:
utr5p_coords = []
utr3p_coords = []
# find start codon in cdscoords: min()
for coord in range( min(exoncoords), min(cdscoords) ):
if coord in exoncoords:
utr5p_coords.append(coord)
# find stop codon in exoncoords: max()
if max(cdscoords)+3 != max(exoncoords):
# check if exon-end != cds-end+3 -> only a stop codon
for coord in range( max(cdscoords)+1, max(exoncoords)+1 ):
if coord in exoncoords:
utr3p_coords.append(coord)
if utr5p_coords or utr3p_coords:
# get list with coding exons for track backbone
cexons = filtergffs4fmethod(gene_gff_list,fmethod=GFF_CDS_FMETHOD)
# create 5'UTRs
gfftrack = list( cexons[0] )
gfftrack[1] = GFF_UTR5_FSOURCE
gfftrack[2] = GFF_UTR5_FMETHOD
utrs.extend( coordset2gfftracks(utr5p_coords,gfftrack))
# create 3'UTRs
gfftrack = list( cexons[0] )
gfftrack[1] = GFF_UTR3_FSOURCE
gfftrack[2] = GFF_UTR3_FMETHOD
utrs.extend( coordset2gfftracks(utr3p_coords,gfftrack))
# return the utr tracks
return utrs
def annotatedgeneexonsizeevaluation(input,small_exon_nt_threshold=25,small_intron_nt_threshold=42):
"""
Check the size of the annotated coding exons
@type input: dict
@param input: input dictionary data structure
@type verbose: Boolean
@param verbose: print discrepancies to STDOUT (True) or not (False, default)
@rtype: Boolean
@return: are small coding exons present in the available annotations?
"""
HAS_TINY_EXONS = False
keysandtype = [
('gff-gene', 'orfid-genestructure', 'annotated gene'),
('gff-unigene', 'orfid-unigenestructure', 'unigene')
]
for org in input.keys():
for (keyA,keyB,typeofevidence) in keysandtype:
if input[org][keyA]:
###for gfftrack in input[org][keyA]:
### if gfftrack[2] != GFF_CDS_FMETHOD: continue
codingexons = filtergffs4fmethod(input[org][keyA],GFF_CDS_FMETHOD)
for pos in range(0,len(codingexons)):
gfftrack = codingexons[pos]
start, end = int(gfftrack[3])-1, int(gfftrack[4])
if ( end - start ) <= small_exon_nt_threshold:
HAS_TINY_EXONS = True
# a small exon! create a warning message
message = "organism: '%s' %s (gff) start: %s end: %s length: %s" % (
org, typeofevidence, (start+1), end, (end - start) )
# a Try to find the id of the orf
if input[org][keyB]:
for id in input[org][keyB]:
orf = input[org]['orfs'].get_orf_by_id(id)
if orf.start <= start+1 and orf.end >= end:
message+=" on %s" % (str(orf))
break
else:
pass
# append the Warning
input[org]['warnings'].append( SmallAnnotatedExonWarning(message) )
# check if it is a small First/Final exon
if pos == 0:
input[org]['warnings'].append( SmallAnnotatedFirstExonWarning(message) )
elif pos == len(codingexons)-1:
input[org]['warnings'].append( SmallAnnotatedFinalExonWarning(message) )
# find small annotated introns
for pos in range(1,len(codingexons)):
gfftrackP = codingexons[pos-1]
gfftrackN = codingexons[pos]
sta = int(gfftrackP[4])
end = int(gfftrackN[3])-1
if end-sta < small_intron_nt_threshold:
# a small intron! create a warning message
message = "organism: '%s' %s (gff) start: %s end: %s length: %s" % (
org, typeofevidence, (sta+1), end, (end - sta) )
# append the Warning
input[org]['warnings'].append( SmallAnnotatedIntronWarning(message) )
# return the Boolean status
return HAS_TINY_EXONS
def geneconfirmation(input,verbose=False):
"""
Confirm given gene GFF structure with Orfs of the DNA sequence
@type input: dict
@param input: input dictionary data structure
@type verbose: Boolean
@param verbose: print discrepancies to STDOUT (True) or not (False, default)
@rtype: tuple
@return: tuple of ( input data structure, TRACKS_ARE_PROPERLY_MATCHED boolean )
"""
input = readsequences(input)
input = rungetorf(input)
input = parseinputgff(input)
GENE_TRACKS_ARE_PROPERLY_MATCHED = True
for org in input.keys():
# (A) find the genestructure_orfmodel of the annotated/known gene structure
input[org]['orfid-genestructure'] = []
_GENE_TRACKS_ARE_PROPERLY_MATCHED = False
if input[org]['gff-gene']:
# get only the CDS-type of tracks that define the coding sequence
genecdstracks = filtergffs4fmethod( input[org]['gff-gene'], GFF_CDS_FMETHOD )
# for comparison / later use get exon tracks too
geneexontracks = filtergffs4fmethod( input[org]['gff-gene'], GFF_EXON_FMETHOD )
if genecdstracks:
# as expected...
pass
elif not genecdstracks and geneexontracks:
# MANY GeneLoci miss CDS tracks but have exon tracks
# In the BROAD annotation logic this represents partial genes:
# based on similarity, but missing start and/or stop codon
# In practice, these instances are likely the result of
# sequence errors!
# But, back to the problem we face here: what to do with these cases?
# The choice that was made here is as follows:
# - check the exon tracks as if they represent unigenes
# - if OK -> convert the exon tracks to CDS tracks
# - the GENE_TRACKS_ARE_PROPERLY_MATCHED will later in this
# function we recognized as False
# Append the Warning message
message = "no tracks of type '%s'" % (GFF_CDS_FMETHOD)
warn = IncompleteGeneStructureWarning(message)
input[org]['warnings'].append( warn )
# obtain exon track's DNA sequence
command = """%s %s %s | grep -v ">" | tr -d "\\n" """ % ( PYTHON_PATH,
EXECUTABLE_GFF2FASTA,
input[org]['genomeseqfile'] )
ci,co,ce = os.popen3(command)
# make sure geneexontracks FREF matches input[org]['genomeseqfile'] FREF
loci_dna_fref = open(input[org]['genomeseqfile']).readlines()[0].split(' ')[0].replace(">","")
ci.write( gffs2txt(geneexontracks).replace( geneexontracks[0][0],loci_dna_fref ) )
ci.close()
protseq = dna2protein( co.read().strip(), 0 )
co.close()
error = ce.read()
ce.close()
if error.find("unrecognized header:") > -1:
# rewrite GFF fref to genomic fref
print "XXXX",error
print command
print gffs2txt(geneexontracks)
print input[org]['genomefref'],input[org]['locusfref'],input[org]['proteinfref']
print open( input[org]['genomeseqfile']).readlines()[0]
if protseq.count('*') == 0:
# The EXON type tracks have an ORF in frame 0
# This represents a partial gene structure.
# Copy the EXON tracks as CDS tracks and run
# the rest of this function.
for _track in geneexontracks:
track = list(_track)
track[2] = GFF_CDS_FMETHOD
track = tuple(track)
input[org]['gff-gene'].append( track )
genecdstracks.append( track )
else:
message = "tracks of type '%s' have no ORF" % (GFF_EXON_FMETHOD)
warn = IncompleteGeneStructureWarning(message)
input[org]['warnings'].append( warn )
GENE_TRACKS_ARE_PROPERLY_MATCHED = False
continue
################################################################
if verbose:
print org, "NO CDS TRACKS!!", input[org]['FREF']
print protseq[0:20]+"..."+protseq[-20:], len(protseq)
for track in genecdstracks: print track[0:7]
################################################################
else:
# neither types of tracks -> no gene annotation at all!
GENE_TRACKS_ARE_PROPERLY_MATCHED = False
continue
# correct the final exon for absence of STOP-codon
# many given gene annotations do not include STOP-codon in final exon, some do
# By definition:
# A track of type CDS should EXCLUDE the stop codon triplet itself
# A track of type exon should INCLUDE the stop codon triplet itself
# Not all annotations follow this principle, however...
# And, in ABFGP, it was chosen to use ANNOTATED CDS tracks as input and
# PREDICTED EXON tracks as output.
# This was done to have the stop-codon included as a check-final-check for
# the final exon (if the predicted CDS is indeed followed by a stop codon).
if not genestructurehasproperstopcodon(genecdstracks,
input[org]['genomeseq'],GFF_CDS_FMETHOD,verbose=False):
# Well, that is as expected -> we expect here CDS tracks
# check if the NEXT triplet isa STOP-codon
try:
triplet = input[org]['genomeseq'][ genecdstracks[-1][4] : genecdstracks[-1][4]+3 ].lower()
except:
# here errors have occurred a lot! Some annotations mix up exon/CDS
# tracks (and in some cases I mixed them up during the conversion
# proces from annotation to GeneLoci). Print this exception ALWAYS!
print "Exception occurred:"
print org, "genecdstracks:", len(genecdstracks)
triplet = input[org]['genomeseq'][ genecdstracks[-1][4] : genecdstracks[-1][4]+3 ].lower()
if triplet in ['tga','tag','taa']:
# update track by +3 length for STOP-codon
# this update is only valid within the scope of this function;
# input[org]['gff-gene'] remains unchanged.
track = list( genecdstracks[-1] )
track[4]+=3
genecdstracks[-1] = tuple(track)
else:
# no CDS type of track followed by a stop-codon;
# ignore here, error message will follow later
pass
elif genecdstracks and geneexontracks and\
genecdstracks[-1][3] == geneexontracks[-1][3] and\
genecdstracks[-1][4]+3 == geneexontracks[-1][4]:
# do not correct anything; it's fine!
pass
else:
# hmmm.... that is weird! We expect here CDS tracks, not EXON tracks
# do a HARD correction on the provided annotation track!
# TODO: this piece of code will fail for spliced stop codons:
# Tgt.....agGA because it is spread over >1 track
for pos in range(0,len(input[org]['gff-gene'])):
track = input[org]['gff-gene'][pos]
if track == genecdstracks[-1]:
# HARD-replace in the input[org]['gff-gene'] list with gff tuples!
track = list(track)
track[4] = track[4]-3
input[org]['gff-gene'][pos] = tuple(track)
break
else:
print "GeneStructureWarning: VERY UNUSUAL SPLITTED STOP CODON", org
# convert exon/CDS tracks to UTR tracks
utrs = create_gene_utrs(input[org]['gff-gene'])
input[org]['gff-gene'].extend(utrs)
# get the orfs of the genestructure
orfids,_GENE_TRACKS_ARE_PROPERLY_MATCHED = genestructuregff2orfs(genecdstracks,input[org]['orfs'],verbose=False)
if (not _GENE_TRACKS_ARE_PROPERLY_MATCHED or not orfids):
print "_GENE_TRACKS_ARE_PROPERLY_MATCHED == False", org, orfids
# redo just for logging purposes!
orfids,_GENE_TRACKS_ARE_PROPERLY_MATCHED = genestructuregff2orfs(genecdstracks,input[org]['orfs'],verbose=True)
# place the list with orfids in 'orfid-genestructure' dict key
input[org]['orfid-genestructure'] = orfids
# check if the gene was properly matched.
if not _GENE_TRACKS_ARE_PROPERLY_MATCHED or not input[org]['orfid-genestructure']:
GENE_TRACKS_ARE_PROPERLY_MATCHED = False
# append warning to warnings list
warn = GeneStructureIsNotMappableOnOrfsWarning("not mappable on orfs")
input[org]['warnings'].append( warn )
# set known gene-tracks to empty list!
input[org]['orfid-genestructure'] = []
# check for a potential sequence error in the sequence
potentialsequenceerror(genecdstracks,input[org]['orfs'],verbose=verbose)
else:
# all fine. Label all the **known** Orfs with IS_ANNOTATED_EXON_LABEL
for orfid in input[org]['orfid-genestructure']:
orfObj = input[org]['orfs'].get_orf_by_id(orfid)
# add label to Orf object
setattr(orfObj,IS_ANNOTATED_EXON_LABEL,True)
# vars for annotated start & stop codon check
GENE_HAS_PROPER_START_CODON = False
GENE_HAS_PROPER_STOP_CODON = False
# (B) check start codon of the gene structure
if _GENE_TRACKS_ARE_PROPERLY_MATCHED and input[org]['gff-gene']:
GENE_HAS_PROPER_START_CODON = genestructurehasproperstartcodon(
genecdstracks,
input[org]['genomeseq'],
GFF_CDS_FMETHOD,
verbose=verbose)
# create warning message if a problem occured
if not GENE_HAS_PROPER_START_CODON:
# create warning message
try:
sta,end = genecdstracks[0][3]-1, genecdstracks[0][3]+2
startdna = input[org]['genomeseq'][sta:end]
orf = input[org]['orfs'].get_orf_by_id(
input[org]['orfid-genestructure'][0] )
message = "no proper start codon (%s [%s] %s) on orf %s" % (
startdna, dna2protein(startdna,0),range(sta,end), orf)
except:
# coordinates are horribly wrong -> make simple warning message
message = "no proper start codon (Exception)"
# append warning to warnings list
warn = IncompleteGeneStructureWarning(message)
input[org]['warnings'].append( warn )
# (C) check stop codon of the gene structure
if _GENE_TRACKS_ARE_PROPERLY_MATCHED and input[org]['gff-gene']:
GENE_HAS_PROPER_STOP_CODON = genestructurehasproperstopcodon(
genecdstracks,
input[org]['genomeseq'],
GFF_CDS_FMETHOD,
verbose=verbose)
if not GENE_HAS_PROPER_STOP_CODON:
# create warning message
try:
sta,end = genecdstracks[-1][4]-3, genecdstracks[-1][4]
stopdna = input[org]['genomeseq'][sta:end]
message = "no proper stop codon (%s [%s] %s) on orf %s" % (
stopdna, dna2protein(stopdna,0),range(sta,end),
input[org]['orfs'].get_orf_by_id(input[org]['orfid-genestructure'][-1])
)
except:
# coordinates are horribly wrong -> make simple warning message
message = "no proper stop codon (Exception)"
# append warning to warnings list
warn = IncompleteGeneStructureWarning(message)
input[org]['warnings'].append( warn )
# (D) check if start_codon is present as annotated track
if _GENE_TRACKS_ARE_PROPERLY_MATCHED and GENE_HAS_PROPER_START_CODON and\
input[org]['gff-gene'] and not filtergffs4fmethod( input[org]['gff-gene'],
GFF_GENESTART_FMETHOD ):
# create start_codon track
# TODO: write a generic function that does the job,
# TODO: whick takes splices start codons into account
startcodon = list(genecdstracks[0])
startcodon[2] = GFF_GENESTART_FMETHOD
startcodon[4] = startcodon[3]+2
startcodon[5] = "."
startcodon[7] = "."
startcodon[8] = startcodon[8].split("; ")[0]
input[org]['gff-gene'].append( tuple(startcodon) )
################################################################
if verbose:
sta,end = genecdstracks[0][3]-1, genecdstracks[0][3]+2
startdna = input[org]['genomeseq'][sta:end]
print "CREATED:", genecdstracks[0][0:7]
print "CREATED:", tuple(startcodon)
print "CREATED:", sta, end, startdna, dna2protein(startdna,0)
################################################################
# (E) check if stop_codon is present as annotated track
if _GENE_TRACKS_ARE_PROPERLY_MATCHED and GENE_HAS_PROPER_STOP_CODON and\
input[org]['gff-gene'] and not filtergffs4fmethod( input[org]['gff-gene'],
GFF_GENESTOP_FMETHOD ):
# create stop_codon track
stopcodon = list(genecdstracks[-1])
stopcodon[2] = GFF_GENESTOP_FMETHOD
stopcodon[4] = stopcodon[4]
stopcodon[3] = stopcodon[4]-2
stopcodon[5] = "."
stopcodon[7] = "."
stopcodon[8] = stopcodon[8].split("; ")[0]
input[org]['gff-gene'].append( tuple(stopcodon) )
################################################################
if verbose:
sta,end = genecdstracks[-1][4]-3, genecdstracks[-1][4]
stopdna = input[org]['genomeseq'][sta:end]
print "CREATED:", genecdstracks[-1][0:7]
print "CREATED:", tuple(stopcodon)
print "CREATED:", sta, end, stopdna, dna2protein(stopdna,0)
################################################################
# (F) label the first & final (annotated) Orfs in the gene structure
if GENE_HAS_PROPER_START_CODON and input[org]['orfid-genestructure']:
firstorfid = input[org]['orfid-genestructure'][0]
firstorf = input[org]['orfs'].get_orf_by_id(firstorfid)
# add label to Orf object
setattr(firstorf,FIRST_ANNOTATED_EXON_LABEL,True)
if GENE_HAS_PROPER_STOP_CODON and input[org]['orfid-genestructure']:
finalorfid = input[org]['orfid-genestructure'][-1]
finalorf = input[org]['orfs'].get_orf_by_id(finalorfid)
# add label to Orf object
setattr(finalorf,FINAL_ANNOTATED_EXON_LABEL,True)
# check if START & STOP codon are properly matched
if not GENE_HAS_PROPER_START_CODON or not GENE_HAS_PROPER_STOP_CODON:
_GENE_TRACKS_ARE_PROPERLY_MATCHED = False
GENE_TRACKS_ARE_PROPERLY_MATCHED = False
# print the negative outcome in verbose mode
if not _GENE_TRACKS_ARE_PROPERLY_MATCHED and verbose:
# set known gene-tracks to empty list!
input[org]['orfid-genestructure'] = []
print "# WARNING: Gene is not mappable on Orfs:", org
# return the incremented input dict and error status (True or False)
return input, GENE_TRACKS_ARE_PROPERLY_MATCHED
def correct_unigene_for_utrs(
unigene_gff_list,
start_codon_gff=(),
stop_codon_gff=(),
minimal_likely_tss_pssm_score=3.0,
shift_tss_pssm_score_ratio=4.0,
dnaseqfname=None,
verbose=False,
):
"""
Check if unigene contains evidence for non-coding UTRs and if so, correct
@type unigene_gff_list: list
@param unigene_gff_list: list with uncorrected unigene gff tuples
@type start_codon_gff: tuple
@param start_codon_gff: tuple representing the (annotated) protein's start codon
@type stop_codon_gff: tuple
@param stop_codon_gff: tuple representing the (annotated) protein's stop codon
@type dnaseqfname: string (or None)
@param dnaseqfname: filename of DNA sequence corresponding to the unigene's GFF
@type minimal_likely_tss_pssm_score: float
@param minimal_likely_tss_pssm_score: minimal (likely) PSSM score of the TSS
@type shift_tss_pssm_score_ratio: float
@param shift_tss_pssm_score_ratio: shift TSS downstream when ratio is exceeded
@type verbose: Boolean
@param verbose: print discrepancies to STDOUT (True) or not (False, default)
@rtype: list of (gff) tuples + typeofunigene string
@return: list with corrected gff tuples + string
@attention: Global variable GFF_UGEXON_FMETHOD is required for this function
@attention: Global variable GFF_UG3UTREXON_FMETHOD is required for this function
@attention: Global variable GFF_UG5UTREXON_FMETHOD is required for this function
"""
# return list with corrected unigene tracks
return_unigene_gff_list = []
start_codon_pos = None
stop_codon_pos = None
typeofunigene = None
# make sets of unigene coordinates
unigene_coordinate_set = gffs2coordset(unigene_gff_list, fmethod=[GFF_UGEXON_FMETHOD])
if dnaseqfname:
# print unigene structure annotation
unigeneexons = filtergffs4fmethod(unigene_gff_list, GFF_UGEXON_FMETHOD)
unigeneexons.sort()
# replace fasta header for correct recognition
# header,descr = parseSingleFastaHeaderFromFile(dnaseqfname)
header, dnaseq, descr = parseSingleFasta(open(dnaseqfname).readlines())
for i in range(0, len(unigeneexons)):
gff = list(unigeneexons[i])
gff[0] = header
# correct for negative coordinate. This can happen in case
# the unigene sticks out of the genelocus
if gff[3] <= 0:
gff[3] = 1
unigeneexons[i] = tuple(gff)
# run unigeneannotation command
command = "%s %s %s" % (PYTHON_PATH, EXECUTABLE_UNIGENEANNOTATION, dnaseqfname)
ci, co = os.popen2(command)
ci.write(gffs2txt(unigeneexons))
ci.close()
ugannotation = co.read().strip().split("\t")
co.close()
typeofunigene = ugannotation[0]
# abstract coordinates of start and stop codon
# from unigene annotation
try:
start_codon_pos = int(ugannotation[5])
except:
start_codon_pos = None
try:
stop_codon_pos = int(ugannotation[6])
except:
stop_codon_pos = None
################################################################
if verbose:
for track in unigene_gff_list:
print track
print ugannotation, start_codon_pos, stop_codon_pos
print "given ATG:", start_codon_gff
print "given TGA:", stop_codon_gff
################################################################
if start_codon_pos:
# check if the PythonRegex obtained Methionine is the most
# likely TSS. When a far better one is available -> shift
# the TSS downstream (5p->3p) to this better TSS.
startcodons = []
for gffpos in range(start_codon_pos, int(unigeneexons[0][4]), 3):
if dnaseq[gffpos - 1 : gffpos - 1 + 3].upper() == "ATG":
tssSta = gffpos - 1 - IC_TSS_PATTERN_OFFSET[0]
tssEnd = gffpos - 1 + 3 + IC_TSS_PATTERN_OFFSET[1]
tssSeq = dnaseq[tssSta:tssEnd]
tssSco = score_tss(tssSeq)
# print 'ATG', gffpos, "%1.2f" % tssSco
startcodons.append((tssSco, gffpos))
# check if there are >1 start codon posibilities
if len(startcodons) > 1 and startcodons[0][0] < minimal_likely_tss_pssm_score:
for score, gffpos in startcodons[1:]:
if (
score >= minimal_likely_tss_pssm_score
and abs(score / startcodons[0][0]) > shift_tss_pssm_score_ratio
):
start_codon_pos = gffpos
# print "TSS pos SHIFTED", startcodons[0][1], "->", gffpos
# break out after first shift; this is now *THE* TSS
break
elif start_codon_gff:
# unigene is a fragment or other transcript without
# likely ATG. Fortunately, ATG is applied from the given
# gene structure. Take this one.
start_codon_pos = int(start_codon_gff[3])
else:
# NO start_codon_pos available -> unigene fragment!
pass
elif start_codon_gff or stop_codon_gff:
typeofunigene = None # unknown -> no unigeneannotation
# No dna sequence is applied to verify the ATG/TGA
# positions of the unigene by unigene annotation.
# Abstract coordinates of start and/or stop codons
# from the given coordinates (from the gene's annotation)
if start_codon_gff:
start_codon_pos = int(start_codon_gff[3])
if stop_codon_gff:
stop_codon_pos = int(stop_codon_gff[4])
else:
typeofunigene = None # unknown -> no unigeneannotation
########################################################
if verbose:
print "NONE GIVEN seq/sta/end:", dnaseqfname
print "gff ATG:", start_codon_gff
print "gff TGA:", stop_codon_gff
########################################################
# no anchors applied in terms of start/stop sites
# TODO future update: find or predict the putative orf
# of this unigene. That specific functionallity should
# NOT be placed in this function!
# for the time being, just return the input gff list.
return unigene_gff_list, typeofunigene
# create an unigene stop codon track when in unigene_coordinate_set
if stop_codon_pos and stop_codon_pos in unigene_coordinate_set:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[2] = "UGstop"
newgff[3] = stop_codon_pos - 2
newgff[4] = stop_codon_pos
return_unigene_gff_list.append(tuple(newgff))
# CORRECT the unigene_coordinate_set for 5p nucleotides
ignore_5p_coords = []
if (
start_codon_pos != None
and start_codon_pos in unigene_coordinate_set
and min(unigene_coordinate_set) < start_codon_pos
):
if verbose:
print "CREATE 5pUTR for ug:", typeofunigene
# yes, there is a 5p unigene alignment part
for coord in unigene_coordinate_set:
if coord < start_codon_pos:
# append to the ignore_5p_coords list
ignore_5p_coords.append(coord)
# remove from the unigene coord set
for coord in ignore_5p_coords:
unigene_coordinate_set.remove(coord)
# CORRECT the unigene_coordinate_set for 3p nucleotides
ignore_3p_coords = []
if (
stop_codon_pos != None
and stop_codon_pos in unigene_coordinate_set
and max(unigene_coordinate_set) > stop_codon_pos
):
if verbose:
print "CREATE 3pUTR for ug:", typeofunigene
# yes, there is a 3p unigene alignment part
for coord in unigene_coordinate_set:
if coord > stop_codon_pos:
# append to the ignore_5p_coords list
ignore_3p_coords.append(coord)
# remove from the unigene coord set
for coord in ignore_3p_coords:
unigene_coordinate_set.remove(coord)
#### remove the stop codon position too
###unigene_coordinate_set.remove(stop_codon_pos-2)
###unigene_coordinate_set.remove(stop_codon_pos-1)
###unigene_coordinate_set.remove(stop_codon_pos)
# make (new) UGExon tracks, corrected for UTRS, if needed
if not (ignore_5p_coords or ignore_3p_coords) and unigene_coordinate_set:
# no utrs available; just set the input to the output list
return_unigene_gff_list.extend(unigene_gff_list)
elif (ignore_5p_coords or ignore_3p_coords) and unigene_coordinate_set:
# create new gff tracks for unigene exons
unigene_exon_coords = list(unigene_coordinate_set)
unigene_exon_coords.sort()
track_coords = [[unigene_exon_coords[0]]]
for coord in unigene_exon_coords[1:]:
if coord == max(track_coords[-1]) + 1:
track_coords[-1].append(coord)
else:
track_coords.append([coord])
for track in track_coords:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[3] = min(track)
newgff[4] = max(track)
# and append to the new return unigene gff list
return_unigene_gff_list.append(tuple(newgff))
# make UTR5UGExon track if it exists
if ignore_5p_coords:
ignore_5p_coords.sort()
tracks = [[ignore_5p_coords[0]]]
for coord in ignore_5p_coords[1:]:
if coord == max(tracks[-1]) + 1:
tracks[-1].append(coord)
else:
tracks.append([coord])
# reverse tracks; if there are >1, inserting in the
# return list will guarantee the correct order
tracks.reverse()
for track in tracks:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[2] = GFF_UG5UTREXON_FMETHOD
newgff[3] = min(track)
newgff[4] = max(track)
# and insert as the first the new return unigene gff list
return_unigene_gff_list.insert(0, tuple(newgff))
# make UTR3UGExon track
if ignore_3p_coords:
ignore_3p_coords.sort()
tracks = [[ignore_3p_coords[0]]]
for coord in ignore_3p_coords[1:]:
if coord == max(tracks[-1]) + 1:
tracks[-1].append(coord)
else:
tracks.append([coord])
for track in tracks:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[2] = GFF_UG3UTREXON_FMETHOD
newgff[3] = min(track)
newgff[4] = max(track)
# and append to the new return unigene gff list
return_unigene_gff_list.append(tuple(newgff))
else:
# hmm... not really expected. There are UniGene tracks,
# but no UniGene exons are recognized. Probably a wrong setting
# applied for GFF_UGEXON_FMETHOD (not identical to the naming in
# the input gff.
pass
# order the unigene gff list (stop codon potentially on the front
return_unigene_gff_list = order_gff_list(return_unigene_gff_list)
################################################################
if verbose and (ignore_5p_coords or ignore_3p_coords):
for track in return_unigene_gff_list:
print track
################################################################
# done! return the new list
return return_unigene_gff_list, typeofunigene
def correct_unigene_for_utrs(unigene_gff_list,
start_codon_gff=(),
stop_codon_gff=(),
minimal_likely_tss_pssm_score=3.0,
shift_tss_pssm_score_ratio=4.0,
dnaseqfname=None,
verbose=False):
"""
Check if unigene contains evidence for non-coding UTRs and if so, correct
@type unigene_gff_list: list
@param unigene_gff_list: list with uncorrected unigene gff tuples
@type start_codon_gff: tuple
@param start_codon_gff: tuple representing the (annotated) protein's start codon
@type stop_codon_gff: tuple
@param stop_codon_gff: tuple representing the (annotated) protein's stop codon
@type dnaseqfname: string (or None)
@param dnaseqfname: filename of DNA sequence corresponding to the unigene's GFF
@type minimal_likely_tss_pssm_score: float
@param minimal_likely_tss_pssm_score: minimal (likely) PSSM score of the TSS
@type shift_tss_pssm_score_ratio: float
@param shift_tss_pssm_score_ratio: shift TSS downstream when ratio is exceeded
@type verbose: Boolean
@param verbose: print discrepancies to STDOUT (True) or not (False, default)
@rtype: list of (gff) tuples + typeofunigene string
@return: list with corrected gff tuples + string
@attention: Global variable GFF_UGEXON_FMETHOD is required for this function
@attention: Global variable GFF_UG3UTREXON_FMETHOD is required for this function
@attention: Global variable GFF_UG5UTREXON_FMETHOD is required for this function
"""
# return list with corrected unigene tracks
return_unigene_gff_list = []
start_codon_pos = None
stop_codon_pos = None
typeofunigene = None
# make sets of unigene coordinates
unigene_coordinate_set = gffs2coordset(unigene_gff_list,
fmethod=[GFF_UGEXON_FMETHOD])
if dnaseqfname:
# print unigene structure annotation
unigeneexons = filtergffs4fmethod(unigene_gff_list, GFF_UGEXON_FMETHOD)
unigeneexons.sort()
# replace fasta header for correct recognition
#header,descr = parseSingleFastaHeaderFromFile(dnaseqfname)
header, dnaseq, descr = parseSingleFasta(open(dnaseqfname).readlines())
for i in range(0, len(unigeneexons)):
gff = list(unigeneexons[i])
gff[0] = header
# correct for negative coordinate. This can happen in case
# the unigene sticks out of the genelocus
if gff[3] <= 0: gff[3] = 1
unigeneexons[i] = tuple(gff)
# run unigeneannotation command
command = "%s %s %s" % (PYTHON_PATH, EXECUTABLE_UNIGENEANNOTATION,
dnaseqfname)
ci, co = os.popen2(command)
ci.write(gffs2txt(unigeneexons))
ci.close()
ugannotation = co.read().strip().split("\t")
co.close()
typeofunigene = ugannotation[0]
# abstract coordinates of start and stop codon
# from unigene annotation
try:
start_codon_pos = int(ugannotation[5])
except:
start_codon_pos = None
try:
stop_codon_pos = int(ugannotation[6])
except:
stop_codon_pos = None
################################################################
if verbose:
for track in unigene_gff_list:
print track
print ugannotation, start_codon_pos, stop_codon_pos
print "given ATG:", start_codon_gff
print "given TGA:", stop_codon_gff
################################################################
if start_codon_pos:
# check if the PythonRegex obtained Methionine is the most
# likely TSS. When a far better one is available -> shift
# the TSS downstream (5p->3p) to this better TSS.
startcodons = []
for gffpos in range(start_codon_pos, int(unigeneexons[0][4]), 3):
if dnaseq[gffpos - 1:gffpos - 1 + 3].upper() == 'ATG':
tssSta = gffpos - 1 - IC_TSS_PATTERN_OFFSET[0]
tssEnd = gffpos - 1 + 3 + IC_TSS_PATTERN_OFFSET[1]
tssSeq = dnaseq[tssSta:tssEnd]
tssSco = score_tss(tssSeq)
#print 'ATG', gffpos, "%1.2f" % tssSco
startcodons.append((tssSco, gffpos))
# check if there are >1 start codon posibilities
if len(startcodons) > 1 and startcodons[0][0] <\
minimal_likely_tss_pssm_score:
for score, gffpos in startcodons[1:]:
if score >= minimal_likely_tss_pssm_score and\
abs( score / startcodons[0][0] ) > shift_tss_pssm_score_ratio:
start_codon_pos = gffpos
#print "TSS pos SHIFTED", startcodons[0][1], "->", gffpos
# break out after first shift; this is now *THE* TSS
break
elif start_codon_gff:
# unigene is a fragment or other transcript without
# likely ATG. Fortunately, ATG is applied from the given
# gene structure. Take this one.
start_codon_pos = int(start_codon_gff[3])
else:
# NO start_codon_pos available -> unigene fragment!
pass
elif start_codon_gff or stop_codon_gff:
typeofunigene = None # unknown -> no unigeneannotation
# No dna sequence is applied to verify the ATG/TGA
# positions of the unigene by unigene annotation.
# Abstract coordinates of start and/or stop codons
# from the given coordinates (from the gene's annotation)
if start_codon_gff:
start_codon_pos = int(start_codon_gff[3])
if stop_codon_gff:
stop_codon_pos = int(stop_codon_gff[4])
else:
typeofunigene = None # unknown -> no unigeneannotation
########################################################
if verbose:
print "NONE GIVEN seq/sta/end:", dnaseqfname
print "gff ATG:", start_codon_gff
print "gff TGA:", stop_codon_gff
########################################################
# no anchors applied in terms of start/stop sites
# TODO future update: find or predict the putative orf
# of this unigene. That specific functionallity should
# NOT be placed in this function!
# for the time being, just return the input gff list.
return unigene_gff_list, typeofunigene
# create an unigene stop codon track when in unigene_coordinate_set
if stop_codon_pos and stop_codon_pos in unigene_coordinate_set:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[2] = 'UGstop'
newgff[3] = stop_codon_pos - 2
newgff[4] = stop_codon_pos
return_unigene_gff_list.append(tuple(newgff))
# CORRECT the unigene_coordinate_set for 5p nucleotides
ignore_5p_coords = []
if start_codon_pos != None and start_codon_pos in\
unigene_coordinate_set and min(unigene_coordinate_set) < start_codon_pos:
if verbose: print "CREATE 5pUTR for ug:", typeofunigene
# yes, there is a 5p unigene alignment part
for coord in unigene_coordinate_set:
if coord < start_codon_pos:
# append to the ignore_5p_coords list
ignore_5p_coords.append(coord)
# remove from the unigene coord set
for coord in ignore_5p_coords:
unigene_coordinate_set.remove(coord)
# CORRECT the unigene_coordinate_set for 3p nucleotides
ignore_3p_coords = []
if stop_codon_pos != None and stop_codon_pos in\
unigene_coordinate_set and max(unigene_coordinate_set) > stop_codon_pos:
if verbose: print "CREATE 3pUTR for ug:", typeofunigene
# yes, there is a 3p unigene alignment part
for coord in unigene_coordinate_set:
if coord > stop_codon_pos:
# append to the ignore_5p_coords list
ignore_3p_coords.append(coord)
# remove from the unigene coord set
for coord in ignore_3p_coords:
unigene_coordinate_set.remove(coord)
#### remove the stop codon position too
###unigene_coordinate_set.remove(stop_codon_pos-2)
###unigene_coordinate_set.remove(stop_codon_pos-1)
###unigene_coordinate_set.remove(stop_codon_pos)
# make (new) UGExon tracks, corrected for UTRS, if needed
if not (ignore_5p_coords or ignore_3p_coords) and unigene_coordinate_set:
# no utrs available; just set the input to the output list
return_unigene_gff_list.extend(unigene_gff_list)
elif (ignore_5p_coords or ignore_3p_coords) and unigene_coordinate_set:
# create new gff tracks for unigene exons
unigene_exon_coords = list(unigene_coordinate_set)
unigene_exon_coords.sort()
track_coords = [[unigene_exon_coords[0]]]
for coord in unigene_exon_coords[1:]:
if coord == max(track_coords[-1]) + 1:
track_coords[-1].append(coord)
else:
track_coords.append([coord])
for track in track_coords:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[3] = min(track)
newgff[4] = max(track)
# and append to the new return unigene gff list
return_unigene_gff_list.append(tuple(newgff))
# make UTR5UGExon track if it exists
if ignore_5p_coords:
ignore_5p_coords.sort()
tracks = [[ignore_5p_coords[0]]]
for coord in ignore_5p_coords[1:]:
if coord == max(tracks[-1]) + 1:
tracks[-1].append(coord)
else:
tracks.append([coord])
# reverse tracks; if there are >1, inserting in the
# return list will guarantee the correct order
tracks.reverse()
for track in tracks:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[2] = GFF_UG5UTREXON_FMETHOD
newgff[3] = min(track)
newgff[4] = max(track)
# and insert as the first the new return unigene gff list
return_unigene_gff_list.insert(0, tuple(newgff))
# make UTR3UGExon track
if ignore_3p_coords:
ignore_3p_coords.sort()
tracks = [[ignore_3p_coords[0]]]
for coord in ignore_3p_coords[1:]:
if coord == max(tracks[-1]) + 1:
tracks[-1].append(coord)
else:
tracks.append([coord])
for track in tracks:
# make a deepcopy of the first unigene exon track and make a list of it
newgff = list(deepcopy(unigene_gff_list[0]))
# update the coordinates
newgff[2] = GFF_UG3UTREXON_FMETHOD
newgff[3] = min(track)
newgff[4] = max(track)
# and append to the new return unigene gff list
return_unigene_gff_list.append(tuple(newgff))
else:
# hmm... not really expected. There are UniGene tracks,
# but no UniGene exons are recognized. Probably a wrong setting
# applied for GFF_UGEXON_FMETHOD (not identical to the naming in
# the input gff.
pass
# order the unigene gff list (stop codon potentially on the front
return_unigene_gff_list = order_gff_list(return_unigene_gff_list)
################################################################
if verbose and (ignore_5p_coords or ignore_3p_coords):
for track in return_unigene_gff_list:
print track
################################################################
# done! return the new list
return return_unigene_gff_list, typeofunigene