def call_cn_var(cnvtag, var_alt, var_ref, alt_forward, alt_reverse, var_list,
var_db):
"""
Call CN for variant sites in non-homology regions.
Use different minimum read cutoffs for clean variant sites and other sites.
Total CN at each site is also considered during filtering.
"""
total_cn = get_total_cn_per_site(cnvtag, var_db, var_list)
assert total_cn is not None
cn_prob = []
for i, forward in enumerate(alt_forward):
reverse = alt_reverse[i]
total_ref = var_ref[i]
total_var = var_alt[i]
if total_var > 0 and var_list[i] in NOISY_VAR:
ntotal = forward + reverse
oddsratio, pvalue = fisher_exact([[forward, reverse],
[ntotal / 2, ntotal / 2]])
if pvalue < P_CUTOFF or forward <= 1 or reverse <= 1:
total_var = 0
if var_list[i] in CLEAN_VAR:
cn_prob.append(call_reg1_cn(total_cn[i], total_var, total_ref, 2))
elif var_list[i] in NOISY_VAR:
cn_prob.append(call_reg1_cn(total_cn[i], total_var, total_ref, 7))
else:
cn_prob.append(call_reg1_cn(total_cn[i], total_var, total_ref, 4))
cn_call = process_raw_call_denovo(cn_prob, 0.8, 0.65, total_cn)
return cn_call
def call_exon9gc(d6_count, d7_count, full_length_cn):
"""
Call exon 9 conversion
"""
lsnp1 = d6_count
lsnp2 = d7_count
if full_length_cn is not None:
full_length_cn = int(full_length_cn)
d6_values = []
cn_prob = []
for i, count1 in enumerate(lsnp1):
count2 = lsnp2[i]
d6_values.append(full_length_cn * count1 / (count1 + count2))
cn_prob.append(call_reg1_cn(full_length_cn, count1, count2, 3))
cn_prob_processed_stringent = process_raw_call_gc(cn_prob, 0.88)
cn_calls = list(
set([a for a in cn_prob_processed_stringent if a is not None]))
if len(cn_calls) == 1:
count1 = np.mean(d6_count)
count2 = np.mean(d7_count)
ave_call = process_raw_call_gc(
[call_reg1_cn(full_length_cn, count1, count2, 3)], 0.75)
if ave_call[0] is not None and ave_call[0] == cn_calls[0]:
if ave_call[0] == 1:
if min(d6_values) < 1.2 and max(d6_values) < 1.3:
return ave_call[0]
else:
return ave_call[0]
return None
def call_cn_var(cnvtag, lsnp1, lsnp2, var_list, var_db):
"""
Call CN for variant sites in non-homology regions.
Use different minimum read cutoffs for clean variant sites and other sites.
Total CN at each site is also considered during filtering.
"""
total_cn = get_total_cn_per_site(cnvtag, var_db, var_list)
assert total_cn is not None
cn_prob = []
for i, count1 in enumerate(lsnp1):
count2 = lsnp2[i]
if var_list[i] not in CLEAN_VAR:
cn_prob.append(call_reg1_cn(total_cn[i], count1, count2, 4))
else:
cn_prob.append(call_reg1_cn(total_cn[i], count1, count2, 2))
cn_call = process_raw_call_denovo(cn_prob, 0.8, 0.65, total_cn)
return cn_call
def call_cn_snp(total_cn, lsnp1, lsnp2, threshold=0.6):
"""
Call CN for SNP sites between CYP2D6 and CYP2D7.
Use a loose cutoff as this is for CNV/hybrid group calling.
"""
cn_prob = []
for i, count1 in enumerate(lsnp1):
count2 = lsnp2[i]
cn_prob.append(call_reg1_cn(total_cn, count1, count2))
cn_call = process_raw_call_gc(cn_prob, threshold)
return cn_call
def call_cn_var_homo(total_cn, lsnp1, lsnp2):
"""
Call CN for variant sites in homology regions.
"""
cn_prob = []
for i, count1 in enumerate(lsnp1):
count2 = lsnp2[i]
cn_prob.append(call_reg1_cn(total_cn, count1, count2, 4))
cn_call = []
for site_call in process_raw_call_denovo(cn_prob, 0.8, 0.65):
if site_call is None:
cn_call.append(None)
else:
cn_call.append(min(site_call, total_cn - 2))
return cn_call
def call_exon9gc(d6_count, d7_count, full_length_cn):
"""
Call exon 9 conversion
"""
lsnp1 = [d6_count]
lsnp2 = [d7_count]
if full_length_cn is not None:
full_length_cn = int(full_length_cn)
cn_prob = []
for i, count1 in enumerate(lsnp1):
count2 = lsnp2[i]
cn_prob.append(call_reg1_cn(full_length_cn, count1, count2, 3))
cn_prob_processed_stringent = process_raw_call_gc(cn_prob, 0.9)
return cn_prob_processed_stringent[0]
def get_smn12_call(raw_cn_call, lsnp1, lsnp2, var_ref, var_alt, mdepth):
"""Return the copy nubmer call of SMN1, SMN2 and SMNstar."""
smn1_fraction = get_fraction(lsnp1, lsnp2)
smn_call = namedtuple(
'smn_call', 'SMN1 SMN2 SMNstar isCarrier isSMA \
SMN1_CN_raw Info Confidence g27134TG_raw g27134TG_CN')
raw_cn_call = update_full_length_cn(raw_cn_call)
full_length_cn = raw_cn_call.exon78_cn
if full_length_cn is None:
# No-call for full-length CN
tag = 'FLCNnoCall'
full_length_cn = raw_cn_call.exon78_depth
raw_smn1_cn = get_raw_smn1_cn(full_length_cn, smn1_fraction)
# In cases where full length copy number is no-call,
# Test for zero copy of SMN1 at the splice variant site.
# If true, report range for SMN2 CN
sma_likelihood_ratio = smn1_cn_zero(lsnp1[SPLICE_INDEX],
lsnp2[SPLICE_INDEX], mdepth)
if sma_likelihood_ratio > 1 / SMA_CUTOFF:
cn_smn2 = '%i-%i' % (math.floor(full_length_cn),
math.ceil(full_length_cn))
dout = smn_call(0, cn_smn2, None, False, True, raw_smn1_cn, tag,
[None] * TOTAL_NUM_SITES, None, None)
elif sma_likelihood_ratio < SMA_CUTOFF:
dout = smn_call(None, None, None, None, False, raw_smn1_cn, tag,
[None] * TOTAL_NUM_SITES, None, None)
else:
dout = smn_call(None, None, None, None, None, raw_smn1_cn, tag,
[None] * TOTAL_NUM_SITES, None, None)
else:
full_length_cn = int(full_length_cn)
raw_smn1_cn = get_raw_smn1_cn(full_length_cn, smn1_fraction)
# Most likely SMN1 CN (or the best two if posterior probability is low)
# at each site.
cn_prob = []
for i in range(TOTAL_NUM_SITES):
cn_prob.append(call_reg1_cn(full_length_cn, lsnp1[i], lsnp2[i]))
# Combine all 6 sites and make a call.
combined_call = call_reg1_cn(
full_length_cn, sum([lsnp1[a] for a in SELECTED_SITES_INDEX]),
sum([lsnp2[a] for a in SELECTED_SITES_INDEX]))
tag, cn_smn1, lsitecall_loose = get_smn1_call_and_tag(
cn_prob, combined_call)
sma_likelihood_ratio = smn1_cn_zero(lsnp1[SPLICE_INDEX],
lsnp2[SPLICE_INDEX], mdepth)
is_sma = get_sma_status(lsitecall_loose, cn_prob, cn_smn1,
sma_likelihood_ratio)
is_carrier = get_carrier_status(lsitecall_loose, cn_prob, cn_smn1,
sma_likelihood_ratio)
# targeted variant(s)
var_cn_confident = None
raw_var_cn = None
var_fraction = get_fraction(var_alt, var_ref)
raw_var_cn = get_raw_smn1_cn(full_length_cn, var_fraction)[0]
var_cn = [call_reg1_cn(full_length_cn, var_alt[0], var_ref[0])]
var_cn_filtered = process_raw_call_denovo(var_cn,
POSTERIOR_CUTOFF_MEDIUM,
POSTERIOR_CUTOFF_LOOSE,
keep_none=False)
if var_cn_filtered != []:
var_cn_confident = var_cn_filtered[0]
if var_cn_confident is not None and cn_smn1 is not None \
and cn_smn1 < var_cn_confident:
var_cn_confident = cn_smn1
# Call CN for SMN2 and SMN*
cn_smn2 = None
cn_smnstar = None
if raw_cn_call.exon16_cn is not None:
cn_smnstar = int(raw_cn_call.exon16_cn) - full_length_cn
if cn_smnstar < 0:
raise Exception(
'Total SMN CN is smaller than full-length SMN CN.')
if cn_smn1 is not None:
cn_smn2 = full_length_cn - cn_smn1
dout = smn_call(cn_smn1, cn_smn2, cn_smnstar, is_carrier, is_sma,
raw_smn1_cn, tag, cn_prob, raw_var_cn,
var_cn_confident)
return dout
